diff options
Diffstat (limited to 'drivers/hsi')
| -rw-r--r-- | drivers/hsi/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/hsi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hsi/clients/Kconfig | 17 | ||||
| -rw-r--r-- | drivers/hsi/clients/Makefile | 4 | ||||
| -rw-r--r-- | drivers/hsi/clients/hsi_char.c | 14 | ||||
| -rw-r--r-- | drivers/hsi/clients/nokia-modem.c | 285 | ||||
| -rw-r--r-- | drivers/hsi/clients/ssi_protocol.c | 1191 | ||||
| -rw-r--r-- | drivers/hsi/controllers/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/hsi/controllers/Makefile | 6 | ||||
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi.c | 625 | ||||
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi.h | 166 | ||||
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi_port.c | 1399 | ||||
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi_regs.h | 171 | ||||
| -rw-r--r-- | drivers/hsi/hsi.c | 275 |
14 files changed, 4160 insertions, 14 deletions
diff --git a/drivers/hsi/Kconfig b/drivers/hsi/Kconfig index d94e38dd80c..2c76de438eb 100644 --- a/drivers/hsi/Kconfig +++ b/drivers/hsi/Kconfig @@ -14,6 +14,7 @@ config HSI_BOARDINFO bool default y +source "drivers/hsi/controllers/Kconfig" source "drivers/hsi/clients/Kconfig" endif # HSI diff --git a/drivers/hsi/Makefile b/drivers/hsi/Makefile index 9d5d33f90de..360371e134f 100644 --- a/drivers/hsi/Makefile +++ b/drivers/hsi/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_HSI_BOARDINFO) += hsi_boardinfo.o obj-$(CONFIG_HSI) += hsi.o +obj-y += controllers/ obj-y += clients/ diff --git a/drivers/hsi/clients/Kconfig b/drivers/hsi/clients/Kconfig index 3bacd275f47..71b9f9ab86e 100644 --- a/drivers/hsi/clients/Kconfig +++ b/drivers/hsi/clients/Kconfig @@ -4,6 +4,23 @@ comment "HSI clients" +config NOKIA_MODEM + tristate "Nokia Modem" + depends on HSI && SSI_PROTOCOL + help + Say Y here if you want to add support for the modem on Nokia + N900 (Nokia RX-51) hardware. + + If unsure, say N. + +config SSI_PROTOCOL + tristate "SSI protocol" + depends on HSI && PHONET && (OMAP_SSI=y || OMAP_SSI=m) + help + If you say Y here, you will enable the SSI protocol aka McSAAB. + + If unsure, say N. + config HSI_CHAR tristate "HSI/SSI character driver" depends on HSI diff --git a/drivers/hsi/clients/Makefile b/drivers/hsi/clients/Makefile index 327c0e27c8b..4d5bc0e0b27 100644 --- a/drivers/hsi/clients/Makefile +++ b/drivers/hsi/clients/Makefile @@ -2,4 +2,6 @@ # Makefile for HSI clients # -obj-$(CONFIG_HSI_CHAR) += hsi_char.o +obj-$(CONFIG_NOKIA_MODEM) += nokia-modem.o +obj-$(CONFIG_SSI_PROTOCOL) += ssi_protocol.o +obj-$(CONFIG_HSI_CHAR) += hsi_char.o diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c index e61e5f991aa..57f70c28fa3 100644 --- a/drivers/hsi/clients/hsi_char.c +++ b/drivers/hsi/clients/hsi_char.c @@ -367,7 +367,7 @@ static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc) return -EINVAL; tmp = cl->rx_cfg; cl->rx_cfg.mode = rxc->mode; - cl->rx_cfg.channels = rxc->channels; + cl->rx_cfg.num_hw_channels = rxc->channels; cl->rx_cfg.flow = rxc->flow; ret = hsi_setup(cl); if (ret < 0) { @@ -383,7 +383,7 @@ static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc) static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc) { rxc->mode = cl->rx_cfg.mode; - rxc->channels = cl->rx_cfg.channels; + rxc->channels = cl->rx_cfg.num_hw_channels; rxc->flow = cl->rx_cfg.flow; } @@ -402,7 +402,7 @@ static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc) return -EINVAL; tmp = cl->tx_cfg; cl->tx_cfg.mode = txc->mode; - cl->tx_cfg.channels = txc->channels; + cl->tx_cfg.num_hw_channels = txc->channels; cl->tx_cfg.speed = txc->speed; cl->tx_cfg.arb_mode = txc->arb_mode; ret = hsi_setup(cl); @@ -417,7 +417,7 @@ static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc) static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc) { txc->mode = cl->tx_cfg.mode; - txc->channels = cl->tx_cfg.channels; + txc->channels = cl->tx_cfg.num_hw_channels; txc->speed = cl->tx_cfg.speed; txc->arb_mode = cl->tx_cfg.arb_mode; } @@ -435,7 +435,7 @@ static ssize_t hsc_read(struct file *file, char __user *buf, size_t len, return -EINVAL; if (len > max_data_size) len = max_data_size; - if (channel->ch >= channel->cl->rx_cfg.channels) + if (channel->ch >= channel->cl->rx_cfg.num_hw_channels) return -ECHRNG; if (test_and_set_bit(HSC_CH_READ, &channel->flags)) return -EBUSY; @@ -492,7 +492,7 @@ static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len, return -EINVAL; if (len > max_data_size) len = max_data_size; - if (channel->ch >= channel->cl->tx_cfg.channels) + if (channel->ch >= channel->cl->tx_cfg.num_hw_channels) return -ECHRNG; if (test_and_set_bit(HSC_CH_WRITE, &channel->flags)) return -EBUSY; @@ -705,7 +705,7 @@ static int hsc_probe(struct device *dev) if (!hsc_major) { ret = alloc_chrdev_region(&hsc_dev, hsc_baseminor, HSC_DEVS, devname); - if (ret > 0) + if (ret == 0) hsc_major = MAJOR(hsc_dev); } else { hsc_dev = MKDEV(hsc_major, hsc_baseminor); diff --git a/drivers/hsi/clients/nokia-modem.c b/drivers/hsi/clients/nokia-modem.c new file mode 100644 index 00000000000..363b780dace --- /dev/null +++ b/drivers/hsi/clients/nokia-modem.c @@ -0,0 +1,285 @@ +/* + * nokia-modem.c + * + * HSI client driver for Nokia N900 modem. + * + * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/gpio/consumer.h> +#include <linux/hsi/hsi.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/hsi/ssi_protocol.h> + +static unsigned int pm; +module_param(pm, int, 0400); +MODULE_PARM_DESC(pm, + "Enable power management (0=disabled, 1=userland based [default])"); + +struct nokia_modem_gpio { + struct gpio_desc *gpio; + const char *name; +}; + +struct nokia_modem_device { + struct tasklet_struct nokia_modem_rst_ind_tasklet; + int nokia_modem_rst_ind_irq; + struct device *device; + struct nokia_modem_gpio *gpios; + int gpio_amount; + struct hsi_client *ssi_protocol; +}; + +static void do_nokia_modem_rst_ind_tasklet(unsigned long data) +{ + struct nokia_modem_device *modem = (struct nokia_modem_device *)data; + + if (!modem) + return; + + dev_info(modem->device, "CMT rst line change detected\n"); + + if (modem->ssi_protocol) + ssip_reset_event(modem->ssi_protocol); +} + +static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data) +{ + struct nokia_modem_device *modem = (struct nokia_modem_device *)data; + + tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet); + + return IRQ_HANDLED; +} + +static void nokia_modem_gpio_unexport(struct device *dev) +{ + struct nokia_modem_device *modem = dev_get_drvdata(dev); + int i; + + for (i = 0; i < modem->gpio_amount; i++) { + sysfs_remove_link(&dev->kobj, modem->gpios[i].name); + gpiod_unexport(modem->gpios[i].gpio); + } +} + +static int nokia_modem_gpio_probe(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct nokia_modem_device *modem = dev_get_drvdata(dev); + int gpio_count, gpio_name_count, i, err; + + gpio_count = of_gpio_count(np); + + if (gpio_count < 0) { + dev_err(dev, "missing gpios: %d\n", gpio_count); + return gpio_count; + } + + gpio_name_count = of_property_count_strings(np, "gpio-names"); + + if (gpio_count != gpio_name_count) { + dev_err(dev, "number of gpios does not equal number of gpio names\n"); + return -EINVAL; + } + + modem->gpios = devm_kzalloc(dev, gpio_count * + sizeof(struct nokia_modem_gpio), GFP_KERNEL); + if (!modem->gpios) { + dev_err(dev, "Could not allocate memory for gpios\n"); + return -ENOMEM; + } + + modem->gpio_amount = gpio_count; + + for (i = 0; i < gpio_count; i++) { + modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i); + if (IS_ERR(modem->gpios[i].gpio)) { + dev_err(dev, "Could not get gpio %d\n", i); + return PTR_ERR(modem->gpios[i].gpio); + } + + err = of_property_read_string_index(np, "gpio-names", i, + &(modem->gpios[i].name)); + if (err) { + dev_err(dev, "Could not get gpio name %d\n", i); + return err; + } + + err = gpiod_direction_output(modem->gpios[i].gpio, 0); + if (err) + return err; + + err = gpiod_export(modem->gpios[i].gpio, 0); + if (err) + return err; + + err = gpiod_export_link(dev, modem->gpios[i].name, + modem->gpios[i].gpio); + if (err) + return err; + } + + return 0; +} + +static int nokia_modem_probe(struct device *dev) +{ + struct device_node *np; + struct nokia_modem_device *modem; + struct hsi_client *cl = to_hsi_client(dev); + struct hsi_port *port = hsi_get_port(cl); + int irq, pflags, err; + struct hsi_board_info ssip; + + np = dev->of_node; + if (!np) { + dev_err(dev, "device tree node not found\n"); + return -ENXIO; + } + + modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL); + if (!modem) { + dev_err(dev, "Could not allocate memory for nokia_modem_device\n"); + return -ENOMEM; + } + dev_set_drvdata(dev, modem); + + irq = irq_of_parse_and_map(np, 0); + if (irq < 0) { + dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq); + return irq; + } + modem->nokia_modem_rst_ind_irq = irq; + pflags = irq_get_trigger_type(irq); + + tasklet_init(&modem->nokia_modem_rst_ind_tasklet, + do_nokia_modem_rst_ind_tasklet, (unsigned long)modem); + err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr, + IRQF_DISABLED | pflags, "modem_rst_ind", modem); + if (err < 0) { + dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n", + irq, pflags); + return err; + } + enable_irq_wake(irq); + + if(pm) { + err = nokia_modem_gpio_probe(dev); + if (err < 0) { + dev_err(dev, "Could not probe GPIOs\n"); + goto error1; + } + } + + ssip.name = "ssi-protocol"; + ssip.tx_cfg = cl->tx_cfg; + ssip.rx_cfg = cl->rx_cfg; + ssip.platform_data = NULL; + ssip.archdata = NULL; + + modem->ssi_protocol = hsi_new_client(port, &ssip); + if (!modem->ssi_protocol) { + dev_err(dev, "Could not register ssi-protocol device\n"); + goto error2; + } + + err = device_attach(&modem->ssi_protocol->device); + if (err == 0) { + dev_err(dev, "Missing ssi-protocol driver\n"); + err = -EPROBE_DEFER; + goto error3; + } else if (err < 0) { + dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err); + goto error3; + } + + /* TODO: register cmt-speech hsi client */ + + dev_info(dev, "Registered Nokia HSI modem\n"); + + return 0; + +error3: + hsi_remove_client(&modem->ssi_protocol->device, NULL); +error2: + nokia_modem_gpio_unexport(dev); +error1: + disable_irq_wake(modem->nokia_modem_rst_ind_irq); + tasklet_kill(&modem->nokia_modem_rst_ind_tasklet); + + return err; +} + +static int nokia_modem_remove(struct device *dev) +{ + struct nokia_modem_device *modem = dev_get_drvdata(dev); + + if (!modem) + return 0; + + if (modem->ssi_protocol) { + hsi_remove_client(&modem->ssi_protocol->device, NULL); + modem->ssi_protocol = NULL; + } + + nokia_modem_gpio_unexport(dev); + dev_set_drvdata(dev, NULL); + disable_irq_wake(modem->nokia_modem_rst_ind_irq); + tasklet_kill(&modem->nokia_modem_rst_ind_tasklet); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id nokia_modem_of_match[] = { + { .compatible = "nokia,n900-modem", }, + {}, +}; +MODULE_DEVICE_TABLE(of, nokia_modem_of_match); +#endif + +static struct hsi_client_driver nokia_modem_driver = { + .driver = { + .name = "nokia-modem", + .owner = THIS_MODULE, + .probe = nokia_modem_probe, + .remove = nokia_modem_remove, + .of_match_table = of_match_ptr(nokia_modem_of_match), + }, +}; + +static int __init nokia_modem_init(void) +{ + return hsi_register_client_driver(&nokia_modem_driver); +} +module_init(nokia_modem_init); + +static void __exit nokia_modem_exit(void) +{ + hsi_unregister_client_driver(&nokia_modem_driver); +} +module_exit(nokia_modem_exit); + +MODULE_ALIAS("hsi:nokia-modem"); +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); +MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem"); +MODULE_LICENSE("GPL"); diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c new file mode 100644 index 00000000000..ce4be3738d4 --- /dev/null +++ b/drivers/hsi/clients/ssi_protocol.c @@ -0,0 +1,1191 @@ +/* + * ssi_protocol.c + * + * Implementation of the SSI McSAAB improved protocol. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org> + * + * Contact: Carlos Chinea <carlos.chinea@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/atomic.h> +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/if_ether.h> +#include <linux/if_arp.h> +#include <linux/if_phonet.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/notifier.h> +#include <linux/scatterlist.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <linux/hsi/hsi.h> +#include <linux/hsi/ssi_protocol.h> + +void ssi_waketest(struct hsi_client *cl, unsigned int enable); + +#define SSIP_TXQUEUE_LEN 100 +#define SSIP_MAX_MTU 65535 +#define SSIP_DEFAULT_MTU 4000 +#define PN_MEDIA_SOS 21 +#define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */ +#define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */ +#define SSIP_KATOUT 15 /* 15 msecs */ +#define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */ +#define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) +#define SSIP_CMT_LOADER_SYNC 0x11223344 +/* + * SSI protocol command definitions + */ +#define SSIP_COMMAND(data) ((data) >> 28) +#define SSIP_PAYLOAD(data) ((data) & 0xfffffff) +/* Commands */ +#define SSIP_SW_BREAK 0 +#define SSIP_BOOTINFO_REQ 1 +#define SSIP_BOOTINFO_RESP 2 +#define SSIP_WAKETEST_RESULT 3 +#define SSIP_START_TRANS 4 +#define SSIP_READY 5 +/* Payloads */ +#define SSIP_DATA_VERSION(data) ((data) & 0xff) +#define SSIP_LOCAL_VERID 1 +#define SSIP_WAKETEST_OK 0 +#define SSIP_WAKETEST_FAILED 1 +#define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff) +#define SSIP_MSG_ID(data) ((data) & 0xff) +/* Generic Command */ +#define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff)) +/* Commands for the control channel */ +#define SSIP_BOOTINFO_REQ_CMD(ver) \ + SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver)) +#define SSIP_BOOTINFO_RESP_CMD(ver) \ + SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver)) +#define SSIP_START_TRANS_CMD(pdulen, id) \ + SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id))) +#define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0) +#define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0) + +/* Main state machine states */ +enum { + INIT, + HANDSHAKE, + ACTIVE, +}; + +/* Send state machine states */ +enum { + SEND_IDLE, + WAIT4READY, + SEND_READY, + SENDING, + SENDING_SWBREAK, +}; + +/* Receive state machine states */ +enum { + RECV_IDLE, + RECV_READY, + RECEIVING, +}; + +/** + * struct ssi_protocol - SSI protocol (McSAAB) data + * @main_state: Main state machine + * @send_state: TX state machine + * @recv_state: RX state machine + * @waketest: Flag to follow wake line test + * @rxid: RX data id + * @txid: TX data id + * @txqueue_len: TX queue length + * @tx_wd: TX watchdog + * @rx_wd: RX watchdog + * @keep_alive: Workaround for SSI HW bug + * @lock: To serialize access to this struct + * @netdev: Phonet network device + * @txqueue: TX data queue + * @cmdqueue: Queue of free commands + * @cl: HSI client own reference + * @link: Link for ssip_list + * @tx_usecount: Refcount to keep track the slaves that use the wake line + * @channel_id_cmd: HSI channel id for command stream + * @channel_id_data: HSI channel id for data stream + */ +struct ssi_protocol { + unsigned int main_state; + unsigned int send_state; + unsigned int recv_state; + unsigned int waketest:1; + u8 rxid; + u8 txid; + unsigned int txqueue_len; + struct timer_list tx_wd; + struct timer_list rx_wd; + struct timer_list keep_alive; /* wake-up workaround */ + spinlock_t lock; + struct net_device *netdev; + struct list_head txqueue; + struct list_head cmdqueue; + struct hsi_client *cl; + struct list_head link; + atomic_t tx_usecnt; + int channel_id_cmd; + int channel_id_data; +}; + +/* List of ssi protocol instances */ +static LIST_HEAD(ssip_list); + +static void ssip_rxcmd_complete(struct hsi_msg *msg); + +static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd) +{ + u32 *data; + + data = sg_virt(msg->sgt.sgl); + *data = cmd; +} + +static inline u32 ssip_get_cmd(struct hsi_msg *msg) +{ + u32 *data; + + data = sg_virt(msg->sgt.sgl); + + return *data; +} + +static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg) +{ + skb_frag_t *frag; + struct scatterlist *sg; + int i; + + BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1)); + + sg = msg->sgt.sgl; + sg_set_buf(sg, skb->data, skb_headlen(skb)); + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + sg = sg_next(sg); + BUG_ON(!sg); + frag = &skb_shinfo(skb)->frags[i]; + sg_set_page(sg, frag->page.p, frag->size, frag->page_offset); + } +} + +static void ssip_free_data(struct hsi_msg *msg) +{ + struct sk_buff *skb; + + skb = msg->context; + pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context, + skb); + msg->destructor = NULL; + dev_kfree_skb(skb); + hsi_free_msg(msg); +} + +static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi, + struct sk_buff *skb, gfp_t flags) +{ + struct hsi_msg *msg; + + msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags); + if (!msg) + return NULL; + ssip_skb_to_msg(skb, msg); + msg->destructor = ssip_free_data; + msg->channel = ssi->channel_id_data; + msg->context = skb; + + return msg; +} + +static inline void ssip_release_cmd(struct hsi_msg *msg) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl); + + dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg)); + spin_lock_bh(&ssi->lock); + list_add_tail(&msg->link, &ssi->cmdqueue); + spin_unlock_bh(&ssi->lock); +} + +static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi) +{ + struct hsi_msg *msg; + + BUG_ON(list_empty(&ssi->cmdqueue)); + + spin_lock_bh(&ssi->lock); + msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); + list_del(&msg->link); + spin_unlock_bh(&ssi->lock); + msg->destructor = ssip_release_cmd; + + return msg; +} + +static void ssip_free_cmds(struct ssi_protocol *ssi) +{ + struct hsi_msg *msg, *tmp; + + list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { + list_del(&msg->link); + msg->destructor = NULL; + kfree(sg_virt(msg->sgt.sgl)); + hsi_free_msg(msg); + } +} + +static int ssip_alloc_cmds(struct ssi_protocol *ssi) +{ + struct hsi_msg *msg; + u32 *buf; + unsigned int i; + + for (i = 0; i < SSIP_MAX_CMDS; i++) { + msg = hsi_alloc_msg(1, GFP_KERNEL); + if (!msg) + goto out; + buf = kmalloc(sizeof(*buf), GFP_KERNEL); + if (!buf) { + hsi_free_msg(msg); + goto out; + } + sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); + msg->channel = ssi->channel_id_cmd; + list_add_tail(&msg->link, &ssi->cmdqueue); + } + + return 0; +out: + ssip_free_cmds(ssi); + + return -ENOMEM; +} + +static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state) +{ + ssi->recv_state = state; + switch (state) { + case RECV_IDLE: + del_timer(&ssi->rx_wd); + if (ssi->send_state == SEND_IDLE) + del_timer(&ssi->keep_alive); + break; + case RECV_READY: + /* CMT speech workaround */ + if (atomic_read(&ssi->tx_usecnt)) + break; + /* Otherwise fall through */ + case RECEIVING: + mod_timer(&ssi->keep_alive, jiffies + + msecs_to_jiffies(SSIP_KATOUT)); + mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); + break; + default: + break; + } +} + +static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state) +{ + ssi->send_state = state; + switch (state) { + case SEND_IDLE: + case SEND_READY: + del_timer(&ssi->tx_wd); + if (ssi->recv_state == RECV_IDLE) + del_timer(&ssi->keep_alive); + break; + case WAIT4READY: + case SENDING: + case SENDING_SWBREAK: + mod_timer(&ssi->keep_alive, + jiffies + msecs_to_jiffies(SSIP_KATOUT)); + mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); + break; + default: + break; + } +} + +struct hsi_client *ssip_slave_get_master(struct hsi_client *slave) +{ + struct hsi_client *master = ERR_PTR(-ENODEV); + struct ssi_protocol *ssi; + + list_for_each_entry(ssi, &ssip_list, link) + if (slave->device.parent == ssi->cl->device.parent) { + master = ssi->cl; + break; + } + + return master; +} +EXPORT_SYMBOL_GPL(ssip_slave_get_master); + +int ssip_slave_start_tx(struct hsi_client *master) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(master); + + dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt)); + spin_lock_bh(&ssi->lock); + if (ssi->send_state == SEND_IDLE) { + ssip_set_txstate(ssi, WAIT4READY); + hsi_start_tx(master); + } + spin_unlock_bh(&ssi->lock); + atomic_inc(&ssi->tx_usecnt); + + return 0; +} +EXPORT_SYMBOL_GPL(ssip_slave_start_tx); + +int ssip_slave_stop_tx(struct hsi_client *master) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(master); + + WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0); + + if (atomic_dec_and_test(&ssi->tx_usecnt)) { + spin_lock_bh(&ssi->lock); + if ((ssi->send_state == SEND_READY) || + (ssi->send_state == WAIT4READY)) { + ssip_set_txstate(ssi, SEND_IDLE); + hsi_stop_tx(master); + } + spin_unlock_bh(&ssi->lock); + } + dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt)); + + return 0; +} +EXPORT_SYMBOL_GPL(ssip_slave_stop_tx); + +int ssip_slave_running(struct hsi_client *master) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(master); + return netif_running(ssi->netdev); +} +EXPORT_SYMBOL_GPL(ssip_slave_running); + +static void ssip_reset(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct list_head *head, *tmp; + struct hsi_msg *msg; + + if (netif_running(ssi->netdev)) + netif_carrier_off(ssi->netdev); + hsi_flush(cl); + spin_lock_bh(&ssi->lock); + if (ssi->send_state != SEND_IDLE) + hsi_stop_tx(cl); + if (ssi->waketest) + ssi_waketest(cl, 0); + del_timer(&ssi->rx_wd); + del_timer(&ssi->tx_wd); + del_timer(&ssi->keep_alive); + ssi->main_state = 0; + ssi->send_state = 0; + ssi->recv_state = 0; + ssi->waketest = 0; + ssi->rxid = 0; + ssi->txid = 0; + list_for_each_safe(head, tmp, &ssi->txqueue) { + msg = list_entry(head, struct hsi_msg, link); + dev_dbg(&cl->device, "Pending TX data\n"); + list_del(head); + ssip_free_data(msg); + } + ssi->txqueue_len = 0; + spin_unlock_bh(&ssi->lock); +} + +static void ssip_dump_state(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + spin_lock_bh(&ssi->lock); + dev_err(&cl->device, "Main state: %d\n", ssi->main_state); + dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state); + dev_err(&cl->device, "Send state: %d\n", ssi->send_state); + dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ? + "Online" : "Offline"); + dev_err(&cl->device, "Wake test %d\n", ssi->waketest); + dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid); + dev_err(&cl->device, "Data TX id: %d\n", ssi->txid); + + list_for_each_entry(msg, &ssi->txqueue, link) + dev_err(&cl->device, "pending TX data (%p)\n", msg); + spin_unlock_bh(&ssi->lock); +} + +static void ssip_error(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + ssip_dump_state(cl); + ssip_reset(cl); + msg = ssip_claim_cmd(ssi); + msg->complete = ssip_rxcmd_complete; + hsi_async_read(cl, msg); +} + +static void ssip_keep_alive(unsigned long data) +{ + struct hsi_client *cl = (struct hsi_client *)data; + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n", + ssi->main_state, ssi->recv_state, ssi->send_state); + + spin_lock(&ssi->lock); + if (ssi->recv_state == RECV_IDLE) + switch (ssi->send_state) { + case SEND_READY: + if (atomic_read(&ssi->tx_usecnt) == 0) + break; + /* + * Fall through. Workaround for cmt-speech + * in that case we relay on audio timers. + */ + case SEND_IDLE: + spin_unlock(&ssi->lock); + return; + } + mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT)); + spin_unlock(&ssi->lock); +} + +static void ssip_wd(unsigned long data) +{ + struct hsi_client *cl = (struct hsi_client *)data; + + dev_err(&cl->device, "Watchdog trigerred\n"); + ssip_error(cl); +} + +static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n"); + msg = ssip_claim_cmd(ssi); + ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID)); + msg->complete = ssip_release_cmd; + hsi_async_write(cl, msg); + dev_dbg(&cl->device, "Issuing RX command\n"); + msg = ssip_claim_cmd(ssi); + msg->complete = ssip_rxcmd_complete; + hsi_async_read(cl, msg); +} + +static void ssip_start_rx(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state, + ssi->recv_state); + spin_lock(&ssi->lock); + /* + * We can have two UP events in a row due to a short low + * high transition. Therefore we need to ignore the sencond UP event. + */ + if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) { + if (ssi->main_state == INIT) { + ssi->main_state = HANDSHAKE; + spin_unlock(&ssi->lock); + ssip_send_bootinfo_req_cmd(cl); + } else { + spin_unlock(&ssi->lock); + } + return; + } + ssip_set_rxstate(ssi, RECV_READY); + spin_unlock(&ssi->lock); + + msg = ssip_claim_cmd(ssi); + ssip_set_cmd(msg, SSIP_READY_CMD); + msg->complete = ssip_release_cmd; + dev_dbg(&cl->device, "Send READY\n"); + hsi_async_write(cl, msg); +} + +static void ssip_stop_rx(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state); + spin_lock(&ssi->lock); + if (likely(ssi->main_state == ACTIVE)) + ssip_set_rxstate(ssi, RECV_IDLE); + spin_unlock(&ssi->lock); +} + +static void ssip_free_strans(struct hsi_msg *msg) +{ + ssip_free_data(msg->context); + ssip_release_cmd(msg); +} + +static void ssip_strans_complete(struct hsi_msg *msg) +{ + struct hsi_client *cl = msg->cl; + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *data; + + data = msg->context; + ssip_release_cmd(msg); + spin_lock(&ssi->lock); + ssip_set_txstate(ssi, SENDING); + spin_unlock(&ssi->lock); + hsi_async_write(cl, data); +} + +static int ssip_xmit(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg, *dmsg; + struct sk_buff *skb; + + spin_lock_bh(&ssi->lock); + if (list_empty(&ssi->txqueue)) { + spin_unlock_bh(&ssi->lock); + return 0; + } + dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link); + list_del(&dmsg->link); + ssi->txqueue_len--; + spin_unlock_bh(&ssi->lock); + + msg = ssip_claim_cmd(ssi); + skb = dmsg->context; + msg->context = dmsg; + msg->complete = ssip_strans_complete; + msg->destructor = ssip_free_strans; + + spin_lock_bh(&ssi->lock); + ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len), + ssi->txid)); + ssi->txid++; + ssip_set_txstate(ssi, SENDING); + spin_unlock_bh(&ssi->lock); + + dev_dbg(&cl->device, "Send STRANS (%d frames)\n", + SSIP_BYTES_TO_FRAMES(skb->len)); + + return hsi_async_write(cl, msg); +} + +/* In soft IRQ context */ +static void ssip_pn_rx(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + + if (unlikely(!netif_running(dev))) { + dev_dbg(&dev->dev, "Drop RX packet\n"); + dev->stats.rx_dropped++; + dev_kfree_skb(skb); + return; + } + if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) { + dev_dbg(&dev->dev, "Error drop RX packet\n"); + dev->stats.rx_errors++; + dev->stats.rx_length_errors++; + dev_kfree_skb(skb); + return; + } + dev->stats.rx_packets++; + dev->stats.rx_bytes += skb->len; + + /* length field is exchanged in network byte order */ + ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]); + dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n", + ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2])); + + skb->protocol = htons(ETH_P_PHONET); + skb_reset_mac_header(skb); + __skb_pull(skb, 1); + netif_rx(skb); +} + +static void ssip_rx_data_complete(struct hsi_msg *msg) +{ + struct hsi_client *cl = msg->cl; + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct sk_buff *skb; + + if (msg->status == HSI_STATUS_ERROR) { + dev_err(&cl->device, "RX data error\n"); + ssip_free_data(msg); + ssip_error(cl); + return; + } + del_timer(&ssi->rx_wd); /* FIXME: Revisit */ + skb = msg->context; + ssip_pn_rx(skb); + hsi_free_msg(msg); +} + +static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + /* Workaroud: Ignore CMT Loader message leftover */ + if (cmd == SSIP_CMT_LOADER_SYNC) + return; + + switch (ssi->main_state) { + case ACTIVE: + dev_err(&cl->device, "Boot info req on active state\n"); + ssip_error(cl); + /* Fall through */ + case INIT: + spin_lock(&ssi->lock); + ssi->main_state = HANDSHAKE; + if (!ssi->waketest) { + ssi->waketest = 1; + ssi_waketest(cl, 1); /* FIXME: To be removed */ + } + /* Start boot handshake watchdog */ + mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); + spin_unlock(&ssi->lock); + dev_dbg(&cl->device, "Send BOOTINFO_RESP\n"); + if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) + dev_warn(&cl->device, "boot info req verid mismatch\n"); + msg = ssip_claim_cmd(ssi); + ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID)); + msg->complete = ssip_release_cmd; + hsi_async_write(cl, msg); + break; + case HANDSHAKE: + /* Ignore */ + break; + default: + dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state); + break; + } +} + +static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) + dev_warn(&cl->device, "boot info resp verid mismatch\n"); + + spin_lock(&ssi->lock); + if (ssi->main_state != ACTIVE) + /* Use tx_wd as a boot watchdog in non ACTIVE state */ + mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); + else + dev_dbg(&cl->device, "boot info resp ignored M(%d)\n", + ssi->main_state); + spin_unlock(&ssi->lock); +} + +static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + unsigned int wkres = SSIP_PAYLOAD(cmd); + + spin_lock(&ssi->lock); + if (ssi->main_state != HANDSHAKE) { + dev_dbg(&cl->device, "wake lines test ignored M(%d)\n", + ssi->main_state); + spin_unlock(&ssi->lock); + return; + } + if (ssi->waketest) { + ssi->waketest = 0; + ssi_waketest(cl, 0); /* FIXME: To be removed */ + } + ssi->main_state = ACTIVE; + del_timer(&ssi->tx_wd); /* Stop boot handshake timer */ + spin_unlock(&ssi->lock); + + dev_notice(&cl->device, "WAKELINES TEST %s\n", + wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK"); + if (wkres & SSIP_WAKETEST_FAILED) { + ssip_error(cl); + return; + } + dev_dbg(&cl->device, "CMT is ONLINE\n"); + netif_wake_queue(ssi->netdev); + netif_carrier_on(ssi->netdev); +} + +static void ssip_rx_ready(struct hsi_client *cl) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + spin_lock(&ssi->lock); + if (unlikely(ssi->main_state != ACTIVE)) { + dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n", + ssi->send_state, ssi->main_state); + spin_unlock(&ssi->lock); + return; + } + if (ssi->send_state != WAIT4READY) { + dev_dbg(&cl->device, "Ignore spurious READY command\n"); + spin_unlock(&ssi->lock); + return; + } + ssip_set_txstate(ssi, SEND_READY); + spin_unlock(&ssi->lock); + ssip_xmit(cl); +} + +static void ssip_rx_strans(struct hsi_client *cl, u32 cmd) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct sk_buff *skb; + struct hsi_msg *msg; + int len = SSIP_PDU_LENGTH(cmd); + + dev_dbg(&cl->device, "RX strans: %d frames\n", len); + spin_lock(&ssi->lock); + if (unlikely(ssi->main_state != ACTIVE)) { + dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n", + ssi->send_state, ssi->main_state); + spin_unlock(&ssi->lock); + return; + } + ssip_set_rxstate(ssi, RECEIVING); + if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) { + dev_err(&cl->device, "START TRANS id %d expeceted %d\n", + SSIP_MSG_ID(cmd), ssi->rxid); + spin_unlock(&ssi->lock); + goto out1; + } + ssi->rxid++; + spin_unlock(&ssi->lock); + skb = netdev_alloc_skb(ssi->netdev, len * 4); + if (unlikely(!skb)) { + dev_err(&cl->device, "No memory for rx skb\n"); + goto out1; + } + skb->dev = ssi->netdev; + skb_put(skb, len * 4); + msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); + if (unlikely(!msg)) { + dev_err(&cl->device, "No memory for RX data msg\n"); + goto out2; + } + msg->complete = ssip_rx_data_complete; + hsi_async_read(cl, msg); + + return; +out2: + dev_kfree_skb(skb); +out1: + ssip_error(cl); +} + +static void ssip_rxcmd_complete(struct hsi_msg *msg) +{ + struct hsi_client *cl = msg->cl; + u32 cmd = ssip_get_cmd(msg); + unsigned int cmdid = SSIP_COMMAND(cmd); + + if (msg->status == HSI_STATUS_ERROR) { + dev_err(&cl->device, "RX error detected\n"); + ssip_release_cmd(msg); + ssip_error(cl); + return; + } + hsi_async_read(cl, msg); + dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd); + switch (cmdid) { + case SSIP_SW_BREAK: + /* Ignored */ + break; + case SSIP_BOOTINFO_REQ: + ssip_rx_bootinforeq(cl, cmd); + break; + case SSIP_BOOTINFO_RESP: + ssip_rx_bootinforesp(cl, cmd); + break; + case SSIP_WAKETEST_RESULT: + ssip_rx_waketest(cl, cmd); + break; + case SSIP_START_TRANS: + ssip_rx_strans(cl, cmd); + break; + case SSIP_READY: + ssip_rx_ready(cl); + break; + default: + dev_warn(&cl->device, "command 0x%08x not supported\n", cmd); + break; + } +} + +static void ssip_swbreak_complete(struct hsi_msg *msg) +{ + struct hsi_client *cl = msg->cl; + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + ssip_release_cmd(msg); + spin_lock(&ssi->lock); + if (list_empty(&ssi->txqueue)) { + if (atomic_read(&ssi->tx_usecnt)) { + ssip_set_txstate(ssi, SEND_READY); + } else { + ssip_set_txstate(ssi, SEND_IDLE); + hsi_stop_tx(cl); + } + spin_unlock(&ssi->lock); + } else { + spin_unlock(&ssi->lock); + ssip_xmit(cl); + } + netif_wake_queue(ssi->netdev); +} + +static void ssip_tx_data_complete(struct hsi_msg *msg) +{ + struct hsi_client *cl = msg->cl; + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *cmsg; + + if (msg->status == HSI_STATUS_ERROR) { + dev_err(&cl->device, "TX data error\n"); + ssip_error(cl); + goto out; + } + spin_lock(&ssi->lock); + if (list_empty(&ssi->txqueue)) { + ssip_set_txstate(ssi, SENDING_SWBREAK); + spin_unlock(&ssi->lock); + cmsg = ssip_claim_cmd(ssi); + ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD); + cmsg->complete = ssip_swbreak_complete; + dev_dbg(&cl->device, "Send SWBREAK\n"); + hsi_async_write(cl, cmsg); + } else { + spin_unlock(&ssi->lock); + ssip_xmit(cl); + } +out: + ssip_free_data(msg); +} + +void ssip_port_event(struct hsi_client *cl, unsigned long event) +{ + switch (event) { + case HSI_EVENT_START_RX: + ssip_start_rx(cl); + break; + case HSI_EVENT_STOP_RX: + ssip_stop_rx(cl); + break; + default: + return; + } +} + +static int ssip_pn_open(struct net_device *dev) +{ + struct hsi_client *cl = to_hsi_client(dev->dev.parent); + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + int err; + + err = hsi_claim_port(cl, 1); + if (err < 0) { + dev_err(&cl->device, "SSI port already claimed\n"); + return err; + } + err = hsi_register_port_event(cl, ssip_port_event); + if (err < 0) { + dev_err(&cl->device, "Register HSI port event failed (%d)\n", + err); + return err; + } + dev_dbg(&cl->device, "Configuring SSI port\n"); + hsi_setup(cl); + spin_lock_bh(&ssi->lock); + if (!ssi->waketest) { + ssi->waketest = 1; + ssi_waketest(cl, 1); /* FIXME: To be removed */ + } + ssi->main_state = INIT; + spin_unlock_bh(&ssi->lock); + + return 0; +} + +static int ssip_pn_stop(struct net_device *dev) +{ + struct hsi_client *cl = to_hsi_client(dev->dev.parent); + + ssip_reset(cl); + hsi_unregister_port_event(cl); + hsi_release_port(cl); + + return 0; +} + +static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu) +{ + if (new_mtu > SSIP_MAX_MTU || new_mtu < PHONET_MIN_MTU) + return -EINVAL; + dev->mtu = new_mtu; + + return 0; +} + +static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct hsi_client *cl = to_hsi_client(dev->dev.parent); + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + struct hsi_msg *msg; + + if ((skb->protocol != htons(ETH_P_PHONET)) || + (skb->len < SSIP_MIN_PN_HDR)) + goto drop; + /* Pad to 32-bits - FIXME: Revisit*/ + if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) + goto drop; + + /* + * Modem sends Phonet messages over SSI with its own endianess... + * Assume that modem has the same endianess as we do. + */ + if (skb_cow_head(skb, 0)) + goto drop; + + /* length field is exchanged in network byte order */ + ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]); + + msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); + if (!msg) { + dev_dbg(&cl->device, "Dropping tx data: No memory\n"); + goto drop; + } + msg->complete = ssip_tx_data_complete; + + spin_lock_bh(&ssi->lock); + if (unlikely(ssi->main_state != ACTIVE)) { + spin_unlock_bh(&ssi->lock); + dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n"); + goto drop2; + } + list_add_tail(&msg->link, &ssi->txqueue); + ssi->txqueue_len++; + if (dev->tx_queue_len < ssi->txqueue_len) { + dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len); + netif_stop_queue(dev); + } + if (ssi->send_state == SEND_IDLE) { + ssip_set_txstate(ssi, WAIT4READY); + spin_unlock_bh(&ssi->lock); + dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len); + hsi_start_tx(cl); + } else if (ssi->send_state == SEND_READY) { + /* Needed for cmt-speech workaround */ + dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n", + ssi->txqueue_len); + spin_unlock_bh(&ssi->lock); + ssip_xmit(cl); + } else { + spin_unlock_bh(&ssi->lock); + } + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb->len; + + return 0; +drop2: + hsi_free_msg(msg); +drop: + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + + return 0; +} + +/* CMT reset event handler */ +void ssip_reset_event(struct hsi_client *master) +{ + struct ssi_protocol *ssi = hsi_client_drvdata(master); + dev_err(&ssi->cl->device, "CMT reset detected!\n"); + ssip_error(ssi->cl); +} +EXPORT_SYMBOL_GPL(ssip_reset_event); + +static const struct net_device_ops ssip_pn_ops = { + .ndo_open = ssip_pn_open, + .ndo_stop = ssip_pn_stop, + .ndo_start_xmit = ssip_pn_xmit, + .ndo_change_mtu = ssip_pn_set_mtu, +}; + +static void ssip_pn_setup(struct net_device *dev) +{ + dev->features = 0; + dev->netdev_ops = &ssip_pn_ops; + dev->type = ARPHRD_PHONET; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->mtu = SSIP_DEFAULT_MTU; + dev->hard_header_len = 1; + dev->dev_addr[0] = PN_MEDIA_SOS; + dev->addr_len = 1; + dev->tx_queue_len = SSIP_TXQUEUE_LEN; + + dev->destructor = free_netdev; + dev->header_ops = &phonet_header_ops; +} + +static int ssi_protocol_probe(struct device *dev) +{ + static const char ifname[] = "phonet%d"; + struct hsi_client *cl = to_hsi_client(dev); + struct ssi_protocol *ssi; + int err; + + ssi = kzalloc(sizeof(*ssi), GFP_KERNEL); + if (!ssi) { + dev_err(dev, "No memory for ssi protocol\n"); + return -ENOMEM; + } + + spin_lock_init(&ssi->lock); + init_timer_deferrable(&ssi->rx_wd); + init_timer_deferrable(&ssi->tx_wd); + init_timer(&ssi->keep_alive); + ssi->rx_wd.data = (unsigned long)cl; + ssi->rx_wd.function = ssip_wd; + ssi->tx_wd.data = (unsigned long)cl; + ssi->tx_wd.function = ssip_wd; + ssi->keep_alive.data = (unsigned long)cl; + ssi->keep_alive.function = ssip_keep_alive; + INIT_LIST_HEAD(&ssi->txqueue); + INIT_LIST_HEAD(&ssi->cmdqueue); + atomic_set(&ssi->tx_usecnt, 0); + hsi_client_set_drvdata(cl, ssi); + ssi->cl = cl; + + ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control"); + if (ssi->channel_id_cmd < 0) { + err = ssi->channel_id_cmd; + dev_err(dev, "Could not get cmd channel (%d)\n", err); + goto out; + } + + ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data"); + if (ssi->channel_id_data < 0) { + err = ssi->channel_id_data; + dev_err(dev, "Could not get data channel (%d)\n", err); + goto out; + } + + err = ssip_alloc_cmds(ssi); + if (err < 0) { + dev_err(dev, "No memory for commands\n"); + goto out; + } + + ssi->netdev = alloc_netdev(0, ifname, ssip_pn_setup); + if (!ssi->netdev) { + dev_err(dev, "No memory for netdev\n"); + err = -ENOMEM; + goto out1; + } + + SET_NETDEV_DEV(ssi->netdev, dev); + netif_carrier_off(ssi->netdev); + err = register_netdev(ssi->netdev); + if (err < 0) { + dev_err(dev, "Register netdev failed (%d)\n", err); + goto out2; + } + + list_add(&ssi->link, &ssip_list); + + dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n", + ssi->channel_id_cmd, ssi->channel_id_data); + + return 0; +out2: + free_netdev(ssi->netdev); +out1: + ssip_free_cmds(ssi); +out: + kfree(ssi); + + return err; +} + +static int ssi_protocol_remove(struct device *dev) +{ + struct hsi_client *cl = to_hsi_client(dev); + struct ssi_protocol *ssi = hsi_client_drvdata(cl); + + list_del(&ssi->link); + unregister_netdev(ssi->netdev); + ssip_free_cmds(ssi); + hsi_client_set_drvdata(cl, NULL); + kfree(ssi); + + return 0; +} + +static struct hsi_client_driver ssip_driver = { + .driver = { + .name = "ssi-protocol", + .owner = THIS_MODULE, + .probe = ssi_protocol_probe, + .remove = ssi_protocol_remove, + }, +}; + +static int __init ssip_init(void) +{ + pr_info("SSI protocol aka McSAAB added\n"); + + return hsi_register_client_driver(&ssip_driver); +} +module_init(ssip_init); + +static void __exit ssip_exit(void) +{ + hsi_unregister_client_driver(&ssip_driver); + pr_info("SSI protocol driver removed\n"); +} +module_exit(ssip_exit); + +MODULE_ALIAS("hsi:ssi-protocol"); +MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); +MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>"); +MODULE_DESCRIPTION("SSI protocol improved aka McSAAB"); +MODULE_LICENSE("GPL"); diff --git a/drivers/hsi/controllers/Kconfig b/drivers/hsi/controllers/Kconfig new file mode 100644 index 00000000000..6aba2780817 --- /dev/null +++ b/drivers/hsi/controllers/Kconfig @@ -0,0 +1,19 @@ +# +# HSI controllers configuration +# +comment "HSI controllers" + +config OMAP_SSI + tristate "OMAP SSI hardware driver" + depends on HSI && OF && (ARCH_OMAP3 || (ARM && COMPILE_TEST)) + ---help--- + SSI is a legacy version of HSI. It is usually used to connect + an application engine with a cellular modem. + If you say Y here, you will enable the OMAP SSI hardware driver. + + If unsure, say N. + +config OMAP_SSI_PORT + tristate + default m if OMAP_SSI=m + default y if OMAP_SSI=y diff --git a/drivers/hsi/controllers/Makefile b/drivers/hsi/controllers/Makefile new file mode 100644 index 00000000000..d2665cf9c54 --- /dev/null +++ b/drivers/hsi/controllers/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for HSI controllers drivers +# + +obj-$(CONFIG_OMAP_SSI) += omap_ssi.o +obj-$(CONFIG_OMAP_SSI_PORT) += omap_ssi_port.o diff --git a/drivers/hsi/controllers/omap_ssi.c b/drivers/hsi/controllers/omap_ssi.c new file mode 100644 index 00000000000..0fc7a7fd014 --- /dev/null +++ b/drivers/hsi/controllers/omap_ssi.c @@ -0,0 +1,625 @@ +/* OMAP SSI driver. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> + * + * Contact: Carlos Chinea <carlos.chinea@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/compiler.h> +#include <linux/err.h> +#include <linux/ioport.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/seq_file.h> +#include <linux/scatterlist.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/debugfs.h> +#include <linux/pm_runtime.h> +#include <linux/of_platform.h> +#include <linux/hsi/hsi.h> +#include <linux/idr.h> + +#include "omap_ssi_regs.h" +#include "omap_ssi.h" + +/* For automatically allocated device IDs */ +static DEFINE_IDA(platform_omap_ssi_ida); + +#ifdef CONFIG_DEBUG_FS +static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused) +{ + struct hsi_controller *ssi = m->private; + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *sys = omap_ssi->sys; + + pm_runtime_get_sync(ssi->device.parent); + seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); + seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); + seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); + pm_runtime_put_sync(ssi->device.parent); + + return 0; +} + +static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused) +{ + struct hsi_controller *ssi = m->private; + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *gdd = omap_ssi->gdd; + void __iomem *sys = omap_ssi->sys; + int lch; + + pm_runtime_get_sync(ssi->device.parent); + + seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", + readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); + seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", + readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); + seq_printf(m, "HW_ID\t\t: 0x%08x\n", + readl(gdd + SSI_GDD_HW_ID_REG)); + seq_printf(m, "PPORT_ID\t: 0x%08x\n", + readl(gdd + SSI_GDD_PPORT_ID_REG)); + seq_printf(m, "MPORT_ID\t: 0x%08x\n", + readl(gdd + SSI_GDD_MPORT_ID_REG)); + seq_printf(m, "TEST\t\t: 0x%08x\n", + readl(gdd + SSI_GDD_TEST_REG)); + seq_printf(m, "GCR\t\t: 0x%08x\n", + readl(gdd + SSI_GDD_GCR_REG)); + + for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { + seq_printf(m, "\nGDD LCH %d\n=========\n", lch); + seq_printf(m, "CSDP\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CSDP_REG(lch))); + seq_printf(m, "CCR\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CCR_REG(lch))); + seq_printf(m, "CICR\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CICR_REG(lch))); + seq_printf(m, "CSR\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CSR_REG(lch))); + seq_printf(m, "CSSA\t\t: 0x%08x\n", + readl(gdd + SSI_GDD_CSSA_REG(lch))); + seq_printf(m, "CDSA\t\t: 0x%08x\n", + readl(gdd + SSI_GDD_CDSA_REG(lch))); + seq_printf(m, "CEN\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CEN_REG(lch))); + seq_printf(m, "CSAC\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CSAC_REG(lch))); + seq_printf(m, "CDAC\t\t: 0x%04x\n", + readw(gdd + SSI_GDD_CDAC_REG(lch))); + seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", + readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); + } + + pm_runtime_put_sync(ssi->device.parent); + + return 0; +} + +static int ssi_regs_open(struct inode *inode, struct file *file) +{ + return single_open(file, ssi_debug_show, inode->i_private); +} + +static int ssi_gdd_regs_open(struct inode *inode, struct file *file) +{ + return single_open(file, ssi_debug_gdd_show, inode->i_private); +} + +static const struct file_operations ssi_regs_fops = { + .open = ssi_regs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations ssi_gdd_regs_fops = { + .open = ssi_gdd_regs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct dentry *dir; + + /* SSI controller */ + omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); + if (IS_ERR(omap_ssi->dir)) + return PTR_ERR(omap_ssi->dir); + + debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, + &ssi_regs_fops); + /* SSI GDD (DMA) */ + dir = debugfs_create_dir("gdd", omap_ssi->dir); + if (IS_ERR(dir)) + goto rback; + debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); + + return 0; +rback: + debugfs_remove_recursive(omap_ssi->dir); + + return PTR_ERR(dir); +} + +static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + debugfs_remove_recursive(omap_ssi->dir); +} +#endif /* CONFIG_DEBUG_FS */ + +/* + * FIXME: Horrible HACK needed until we remove the useless wakeline test + * in the CMT. To be removed !!!! + */ +void ssi_waketest(struct hsi_client *cl, unsigned int enable) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + omap_port->wktest = !!enable; + if (omap_port->wktest) { + pm_runtime_get_sync(ssi->device.parent); + writel_relaxed(SSI_WAKE(0), + omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); + } else { + writel_relaxed(SSI_WAKE(0), + omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); + pm_runtime_put_sync(ssi->device.parent); + } +} +EXPORT_SYMBOL_GPL(ssi_waketest); + +static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; + struct hsi_port *port = to_hsi_port(msg->cl->device.parent); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + unsigned int dir; + u32 csr; + u32 val; + + spin_lock(&omap_ssi->lock); + + val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + val &= ~SSI_GDD_LCH(lch); + writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + + if (msg->ttype == HSI_MSG_READ) { + dir = DMA_FROM_DEVICE; + val = SSI_DATAAVAILABLE(msg->channel); + pm_runtime_put_sync(ssi->device.parent); + } else { + dir = DMA_TO_DEVICE; + val = SSI_DATAACCEPT(msg->channel); + /* Keep clocks reference for write pio event */ + } + dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); + csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); + omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ + dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", + msg->channel, msg->ttype); + spin_unlock(&omap_ssi->lock); + if (csr & SSI_CSR_TOUR) { /* Timeout error */ + msg->status = HSI_STATUS_ERROR; + msg->actual_len = 0; + spin_lock(&omap_port->lock); + list_del(&msg->link); /* Dequeue msg */ + spin_unlock(&omap_port->lock); + msg->complete(msg); + return; + } + spin_lock(&omap_port->lock); + val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + spin_unlock(&omap_port->lock); + + msg->status = HSI_STATUS_COMPLETED; + msg->actual_len = sg_dma_len(msg->sgt.sgl); +} + +static void ssi_gdd_tasklet(unsigned long dev) +{ + struct hsi_controller *ssi = (struct hsi_controller *)dev; + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *sys = omap_ssi->sys; + unsigned int lch; + u32 status_reg; + + pm_runtime_get_sync(ssi->device.parent); + + status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); + for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { + if (status_reg & SSI_GDD_LCH(lch)) + ssi_gdd_complete(ssi, lch); + } + writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); + status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); + + pm_runtime_put_sync(ssi->device.parent); + + if (status_reg) + tasklet_hi_schedule(&omap_ssi->gdd_tasklet); + else + enable_irq(omap_ssi->gdd_irq); + +} + +static irqreturn_t ssi_gdd_isr(int irq, void *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + tasklet_hi_schedule(&omap_ssi->gdd_tasklet); + disable_irq_nosync(irq); + + return IRQ_HANDLED; +} + +static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + unsigned long rate = clk_get_rate(omap_ssi->fck); + return rate; +} + +static int __init ssi_get_iomem(struct platform_device *pd, + const char *name, void __iomem **pbase, dma_addr_t *phy) +{ + struct resource *mem; + struct resource *ioarea; + void __iomem *base; + struct hsi_controller *ssi = platform_get_drvdata(pd); + + mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); + if (!mem) { + dev_err(&pd->dev, "IO memory region missing (%s)\n", name); + return -ENXIO; + } + ioarea = devm_request_mem_region(&ssi->device, mem->start, + resource_size(mem), dev_name(&pd->dev)); + if (!ioarea) { + dev_err(&pd->dev, "%s IO memory region request failed\n", + mem->name); + return -ENXIO; + } + base = devm_ioremap(&ssi->device, mem->start, resource_size(mem)); + if (!base) { + dev_err(&pd->dev, "%s IO remap failed\n", mem->name); + return -ENXIO; + } + *pbase = base; + + if (phy) + *phy = mem->start; + + return 0; +} + +static int __init ssi_add_controller(struct hsi_controller *ssi, + struct platform_device *pd) +{ + struct omap_ssi_controller *omap_ssi; + int err; + + omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); + if (!omap_ssi) { + dev_err(&pd->dev, "not enough memory for omap ssi\n"); + return -ENOMEM; + } + + ssi->id = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); + if (ssi->id < 0) { + err = ssi->id; + goto out_err; + } + + ssi->owner = THIS_MODULE; + ssi->device.parent = &pd->dev; + dev_set_name(&ssi->device, "ssi%d", ssi->id); + hsi_controller_set_drvdata(ssi, omap_ssi); + omap_ssi->dev = &ssi->device; + err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); + if (err < 0) + goto out_err; + err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); + if (err < 0) + goto out_err; + omap_ssi->gdd_irq = platform_get_irq_byname(pd, "gdd_mpu"); + if (omap_ssi->gdd_irq < 0) { + dev_err(&pd->dev, "GDD IRQ resource missing\n"); + err = omap_ssi->gdd_irq; + goto out_err; + } + tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, + (unsigned long)ssi); + err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, + 0, "gdd_mpu", ssi); + if (err < 0) { + dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", + omap_ssi->gdd_irq, err); + goto out_err; + } + + omap_ssi->port = devm_kzalloc(&ssi->device, + sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); + if (!omap_ssi->port) { + err = -ENOMEM; + goto out_err; + } + + omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); + if (IS_ERR(omap_ssi->fck)) { + dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", + PTR_ERR(omap_ssi->fck)); + err = -ENODEV; + goto out_err; + } + + /* TODO: find register, which can be used to detect context loss */ + omap_ssi->get_loss = NULL; + + omap_ssi->max_speed = UINT_MAX; + spin_lock_init(&omap_ssi->lock); + err = hsi_register_controller(ssi); + + if (err < 0) + goto out_err; + + return 0; + +out_err: + ida_simple_remove(&platform_omap_ssi_ida, ssi->id); + return err; +} + +static int __init ssi_hw_init(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + unsigned int i; + u32 val; + int err; + + err = pm_runtime_get_sync(ssi->device.parent); + if (err < 0) { + dev_err(&ssi->device, "runtime PM failed %d\n", err); + return err; + } + /* Reseting SSI controller */ + writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG); + val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); + for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) { + msleep(20); + val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); + } + if (!(val & SSI_RESETDONE)) { + dev_err(&ssi->device, "SSI HW reset failed\n"); + pm_runtime_put_sync(ssi->device.parent); + return -EIO; + } + /* Reseting GDD */ + writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); + /* Get FCK rate in KHz */ + omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); + dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); + /* Set default PM settings */ + val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART; + writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG); + omap_ssi->sysconfig = val; + writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); + omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; + pm_runtime_put_sync(ssi->device.parent); + + return 0; +} + +static void ssi_remove_controller(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + int id = ssi->id; + tasklet_kill(&omap_ssi->gdd_tasklet); + hsi_unregister_controller(ssi); + ida_simple_remove(&platform_omap_ssi_ida, id); +} + +static inline int ssi_of_get_available_ports_count(const struct device_node *np) +{ + struct device_node *child; + int num = 0; + + for_each_available_child_of_node(np, child) + if (of_device_is_compatible(child, "ti,omap3-ssi-port")) + num++; + + return num; +} + +static int ssi_remove_ports(struct device *dev, void *c) +{ + struct platform_device *pdev = to_platform_device(dev); + + of_device_unregister(pdev); + + return 0; +} + +static int __init ssi_probe(struct platform_device *pd) +{ + struct platform_device *childpdev; + struct device_node *np = pd->dev.of_node; + struct device_node *child; + struct hsi_controller *ssi; + int err; + int num_ports; + + if (!np) { + dev_err(&pd->dev, "missing device tree data\n"); + return -EINVAL; + } + + num_ports = ssi_of_get_available_ports_count(np); + + ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); + if (!ssi) { + dev_err(&pd->dev, "No memory for controller\n"); + return -ENOMEM; + } + + platform_set_drvdata(pd, ssi); + + err = ssi_add_controller(ssi, pd); + if (err < 0) + goto out1; + + pm_runtime_irq_safe(&pd->dev); + pm_runtime_enable(&pd->dev); + + err = ssi_hw_init(ssi); + if (err < 0) + goto out2; +#ifdef CONFIG_DEBUG_FS + err = ssi_debug_add_ctrl(ssi); + if (err < 0) + goto out2; +#endif + + for_each_available_child_of_node(np, child) { + if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) + continue; + + childpdev = of_platform_device_create(child, NULL, &pd->dev); + if (!childpdev) { + err = -ENODEV; + dev_err(&pd->dev, "failed to create ssi controller port\n"); + goto out3; + } + } + + dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", + ssi->id, num_ports); + return err; +out3: + device_for_each_child(&pd->dev, NULL, ssi_remove_ports); +out2: + ssi_remove_controller(ssi); +out1: + platform_set_drvdata(pd, NULL); + pm_runtime_disable(&pd->dev); + + return err; +} + +static int __exit ssi_remove(struct platform_device *pd) +{ + struct hsi_controller *ssi = platform_get_drvdata(pd); + +#ifdef CONFIG_DEBUG_FS + ssi_debug_remove_ctrl(ssi); +#endif + ssi_remove_controller(ssi); + platform_set_drvdata(pd, NULL); + + pm_runtime_disable(&pd->dev); + + /* cleanup of of_platform_populate() call */ + device_for_each_child(&pd->dev, NULL, ssi_remove_ports); + + return 0; +} + +#ifdef CONFIG_PM_RUNTIME +static int omap_ssi_runtime_suspend(struct device *dev) +{ + struct hsi_controller *ssi = dev_get_drvdata(dev); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(dev, "runtime suspend!\n"); + + if (omap_ssi->get_loss) + omap_ssi->loss_count = + omap_ssi->get_loss(ssi->device.parent); + + return 0; +} + +static int omap_ssi_runtime_resume(struct device *dev) +{ + struct hsi_controller *ssi = dev_get_drvdata(dev); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(dev, "runtime resume!\n"); + + if ((omap_ssi->get_loss) && (omap_ssi->loss_count == + omap_ssi->get_loss(ssi->device.parent))) + return 0; + + writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); + + return 0; +} + +static const struct dev_pm_ops omap_ssi_pm_ops = { + SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, + NULL) +}; + +#define DEV_PM_OPS (&omap_ssi_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + +#ifdef CONFIG_OF +static const struct of_device_id omap_ssi_of_match[] = { + { .compatible = "ti,omap3-ssi", }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap_ssi_of_match); +#else +#define omap_ssi_of_match NULL +#endif + +static struct platform_driver ssi_pdriver = { + .remove = __exit_p(ssi_remove), + .driver = { + .name = "omap_ssi", + .owner = THIS_MODULE, + .pm = DEV_PM_OPS, + .of_match_table = omap_ssi_of_match, + }, +}; + +module_platform_driver_probe(ssi_pdriver, ssi_probe); + +MODULE_ALIAS("platform:omap_ssi"); +MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); +MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hsi/controllers/omap_ssi.h b/drivers/hsi/controllers/omap_ssi.h new file mode 100644 index 00000000000..9d056417d88 --- /dev/null +++ b/drivers/hsi/controllers/omap_ssi.h @@ -0,0 +1,166 @@ +/* OMAP SSI internal interface. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * Copyright (C) 2013 Sebastian Reichel + * + * Contact: Carlos Chinea <carlos.chinea@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#ifndef __LINUX_HSI_OMAP_SSI_H__ +#define __LINUX_HSI_OMAP_SSI_H__ + +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/hsi/hsi.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/io.h> + +#define SSI_MAX_CHANNELS 8 +#define SSI_MAX_GDD_LCH 8 +#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) + +/** + * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context + * @mode: Bit transmission mode + * @channels: Number of channels + * @framesize: Frame size in bits + * @timeout: RX frame timeout + * @divisor: TX divider + * @arb_mode: Arbitration mode for TX frame (Round robin, priority) + */ +struct omap_ssm_ctx { + u32 mode; + u32 channels; + u32 frame_size; + union { + u32 timeout; /* Rx Only */ + struct { + u32 arb_mode; + u32 divisor; + }; /* Tx only */ + }; +}; + +/** + * struct omap_ssi_port - OMAP SSI port data + * @dev: device associated to the port (HSI port) + * @pdev: platform device associated to the port + * @sst_dma: SSI transmitter physical base address + * @ssr_dma: SSI receiver physical base address + * @sst_base: SSI transmitter base address + * @ssr_base: SSI receiver base address + * @wk_lock: spin lock to serialize access to the wake lines + * @lock: Spin lock to serialize access to the SSI port + * @channels: Current number of channels configured (1,2,4 or 8) + * @txqueue: TX message queues + * @rxqueue: RX message queues + * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode) + * @irq: IRQ number + * @wake_irq: IRQ number for incoming wake line (-1 if none) + * @wake_gpio: GPIO number for incoming wake line (-1 if none) + * @pio_tasklet: Bottom half for PIO transfers and events + * @wake_tasklet: Bottom half for incoming wake events + * @wkin_cken: Keep track of clock references due to the incoming wake line + * @wk_refcount: Reference count for output wake line + * @sys_mpu_enable: Context for the interrupt enable register for irq 0 + * @sst: Context for the synchronous serial transmitter + * @ssr: Context for the synchronous serial receiver + */ +struct omap_ssi_port { + struct device *dev; + struct device *pdev; + dma_addr_t sst_dma; + dma_addr_t ssr_dma; + void __iomem *sst_base; + void __iomem *ssr_base; + spinlock_t wk_lock; + spinlock_t lock; + unsigned int channels; + struct list_head txqueue[SSI_MAX_CHANNELS]; + struct list_head rxqueue[SSI_MAX_CHANNELS]; + struct list_head brkqueue; + unsigned int irq; + int wake_irq; + int wake_gpio; + struct tasklet_struct pio_tasklet; + struct tasklet_struct wake_tasklet; + bool wktest:1; /* FIXME: HACK to be removed */ + bool wkin_cken:1; /* Workaround */ + unsigned int wk_refcount; + /* OMAP SSI port context */ + u32 sys_mpu_enable; /* We use only one irq */ + struct omap_ssm_ctx sst; + struct omap_ssm_ctx ssr; + u32 loss_count; + u32 port_id; +#ifdef CONFIG_DEBUG_FS + struct dentry *dir; +#endif +}; + +/** + * struct gdd_trn - GDD transaction data + * @msg: Pointer to the HSI message being served + * @sg: Pointer to the current sg entry being served + */ +struct gdd_trn { + struct hsi_msg *msg; + struct scatterlist *sg; +}; + +/** + * struct omap_ssi_controller - OMAP SSI controller data + * @dev: device associated to the controller (HSI controller) + * @sys: SSI I/O base address + * @gdd: GDD I/O base address + * @fck: SSI functional clock + * @gdd_irq: IRQ line for GDD + * @gdd_tasklet: bottom half for DMA transfers + * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers + * @lock: lock to serialize access to GDD + * @loss_count: To follow if we need to restore context or not + * @max_speed: Maximum TX speed (Kb/s) set by the clients. + * @sysconfig: SSI controller saved context + * @gdd_gcr: SSI GDD saved context + * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any + * @port: Array of pointers of the ports of the controller + * @dir: Debugfs SSI root directory + */ +struct omap_ssi_controller { + struct device *dev; + void __iomem *sys; + void __iomem *gdd; + struct clk *fck; + unsigned int gdd_irq; + struct tasklet_struct gdd_tasklet; + struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH]; + spinlock_t lock; + unsigned long fck_rate; + u32 loss_count; + u32 max_speed; + /* OMAP SSI Controller context */ + u32 sysconfig; + u32 gdd_gcr; + int (*get_loss)(struct device *dev); + struct omap_ssi_port **port; +#ifdef CONFIG_DEBUG_FS + struct dentry *dir; +#endif +}; + +#endif /* __LINUX_HSI_OMAP_SSI_H__ */ diff --git a/drivers/hsi/controllers/omap_ssi_port.c b/drivers/hsi/controllers/omap_ssi_port.c new file mode 100644 index 00000000000..b8693f0b27f --- /dev/null +++ b/drivers/hsi/controllers/omap_ssi_port.c @@ -0,0 +1,1399 @@ +/* OMAP SSI port driver. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> + * + * Contact: Carlos Chinea <carlos.chinea@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/pm_runtime.h> + +#include <linux/of_gpio.h> +#include <linux/debugfs.h> + +#include "omap_ssi_regs.h" +#include "omap_ssi.h" + +static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) +{ + return 0; +} + +static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) +{ + return 0; +} + +static inline unsigned int ssi_wakein(struct hsi_port *port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + return gpio_get_value(omap_port->wake_gpio); +} + +#ifdef CONFIG_DEBUG_FS +static void ssi_debug_remove_port(struct hsi_port *port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + + debugfs_remove_recursive(omap_port->dir); +} + +static int ssi_debug_port_show(struct seq_file *m, void *p __maybe_unused) +{ + struct hsi_port *port = m->private; + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *base = omap_ssi->sys; + unsigned int ch; + + pm_runtime_get_sync(omap_port->pdev); + if (omap_port->wake_irq > 0) + seq_printf(m, "CAWAKE\t\t: %d\n", ssi_wakein(port)); + seq_printf(m, "WAKE\t\t: 0x%08x\n", + readl(base + SSI_WAKE_REG(port->num))); + seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0, + readl(base + SSI_MPU_ENABLE_REG(port->num, 0))); + seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0, + readl(base + SSI_MPU_STATUS_REG(port->num, 0))); + /* SST */ + base = omap_port->sst_base; + seq_puts(m, "\nSST\n===\n"); + seq_printf(m, "ID SST\t\t: 0x%08x\n", + readl(base + SSI_SST_ID_REG)); + seq_printf(m, "MODE\t\t: 0x%08x\n", + readl(base + SSI_SST_MODE_REG)); + seq_printf(m, "FRAMESIZE\t: 0x%08x\n", + readl(base + SSI_SST_FRAMESIZE_REG)); + seq_printf(m, "DIVISOR\t\t: 0x%08x\n", + readl(base + SSI_SST_DIVISOR_REG)); + seq_printf(m, "CHANNELS\t: 0x%08x\n", + readl(base + SSI_SST_CHANNELS_REG)); + seq_printf(m, "ARBMODE\t\t: 0x%08x\n", + readl(base + SSI_SST_ARBMODE_REG)); + seq_printf(m, "TXSTATE\t\t: 0x%08x\n", + readl(base + SSI_SST_TXSTATE_REG)); + seq_printf(m, "BUFSTATE\t: 0x%08x\n", + readl(base + SSI_SST_BUFSTATE_REG)); + seq_printf(m, "BREAK\t\t: 0x%08x\n", + readl(base + SSI_SST_BREAK_REG)); + for (ch = 0; ch < omap_port->channels; ch++) { + seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch, + readl(base + SSI_SST_BUFFER_CH_REG(ch))); + } + /* SSR */ + base = omap_port->ssr_base; + seq_puts(m, "\nSSR\n===\n"); + seq_printf(m, "ID SSR\t\t: 0x%08x\n", + readl(base + SSI_SSR_ID_REG)); + seq_printf(m, "MODE\t\t: 0x%08x\n", + readl(base + SSI_SSR_MODE_REG)); + seq_printf(m, "FRAMESIZE\t: 0x%08x\n", + readl(base + SSI_SSR_FRAMESIZE_REG)); + seq_printf(m, "CHANNELS\t: 0x%08x\n", + readl(base + SSI_SSR_CHANNELS_REG)); + seq_printf(m, "TIMEOUT\t\t: 0x%08x\n", + readl(base + SSI_SSR_TIMEOUT_REG)); + seq_printf(m, "RXSTATE\t\t: 0x%08x\n", + readl(base + SSI_SSR_RXSTATE_REG)); + seq_printf(m, "BUFSTATE\t: 0x%08x\n", + readl(base + SSI_SSR_BUFSTATE_REG)); + seq_printf(m, "BREAK\t\t: 0x%08x\n", + readl(base + SSI_SSR_BREAK_REG)); + seq_printf(m, "ERROR\t\t: 0x%08x\n", + readl(base + SSI_SSR_ERROR_REG)); + seq_printf(m, "ERRORACK\t: 0x%08x\n", + readl(base + SSI_SSR_ERRORACK_REG)); + for (ch = 0; ch < omap_port->channels; ch++) { + seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch, + readl(base + SSI_SSR_BUFFER_CH_REG(ch))); + } + pm_runtime_put_sync(omap_port->pdev); + + return 0; +} + +static int ssi_port_regs_open(struct inode *inode, struct file *file) +{ + return single_open(file, ssi_debug_port_show, inode->i_private); +} + +static const struct file_operations ssi_port_regs_fops = { + .open = ssi_port_regs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int ssi_div_get(void *data, u64 *val) +{ + struct hsi_port *port = data; + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + + pm_runtime_get_sync(omap_port->pdev); + *val = readl(omap_port->sst_base + SSI_SST_DIVISOR_REG); + pm_runtime_put_sync(omap_port->pdev); + + return 0; +} + +static int ssi_div_set(void *data, u64 val) +{ + struct hsi_port *port = data; + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + + if (val > 127) + return -EINVAL; + + pm_runtime_get_sync(omap_port->pdev); + writel(val, omap_port->sst_base + SSI_SST_DIVISOR_REG); + omap_port->sst.divisor = val; + pm_runtime_put_sync(omap_port->pdev); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(ssi_sst_div_fops, ssi_div_get, ssi_div_set, "%llu\n"); + +static int __init ssi_debug_add_port(struct omap_ssi_port *omap_port, + struct dentry *dir) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + + dir = debugfs_create_dir(dev_name(omap_port->dev), dir); + if (IS_ERR(dir)) + return PTR_ERR(dir); + omap_port->dir = dir; + debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops); + dir = debugfs_create_dir("sst", dir); + if (IS_ERR(dir)) + return PTR_ERR(dir); + debugfs_create_file("divisor", S_IRUGO | S_IWUSR, dir, port, + &ssi_sst_div_fops); + + return 0; +} +#endif + +static int ssi_claim_lch(struct hsi_msg *msg) +{ + + struct hsi_port *port = hsi_get_port(msg->cl); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + int lch; + + for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) + if (!omap_ssi->gdd_trn[lch].msg) { + omap_ssi->gdd_trn[lch].msg = msg; + omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl; + return lch; + } + + return -EBUSY; +} + +static int ssi_start_dma(struct hsi_msg *msg, int lch) +{ + struct hsi_port *port = hsi_get_port(msg->cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *gdd = omap_ssi->gdd; + int err; + u16 csdp; + u16 ccr; + u32 s_addr; + u32 d_addr; + u32 tmp; + + if (msg->ttype == HSI_MSG_READ) { + err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, + DMA_FROM_DEVICE); + if (err < 0) { + dev_dbg(&ssi->device, "DMA map SG failed !\n"); + return err; + } + csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT | + SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT | + SSI_DATA_TYPE_S32; + ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */ + ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST | + SSI_CCR_ENABLE; + s_addr = omap_port->ssr_dma + + SSI_SSR_BUFFER_CH_REG(msg->channel); + d_addr = sg_dma_address(msg->sgt.sgl); + } else { + err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, + DMA_TO_DEVICE); + if (err < 0) { + dev_dbg(&ssi->device, "DMA map SG failed !\n"); + return err; + } + csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT | + SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT | + SSI_DATA_TYPE_S32; + ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */ + ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST | + SSI_CCR_ENABLE; + s_addr = sg_dma_address(msg->sgt.sgl); + d_addr = omap_port->sst_dma + + SSI_SST_BUFFER_CH_REG(msg->channel); + } + dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x d_addr %08x\n", + lch, csdp, ccr, s_addr, d_addr); + + /* Hold clocks during the transfer */ + pm_runtime_get_sync(omap_port->pdev); + + writew_relaxed(csdp, gdd + SSI_GDD_CSDP_REG(lch)); + writew_relaxed(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch)); + writel_relaxed(d_addr, gdd + SSI_GDD_CDSA_REG(lch)); + writel_relaxed(s_addr, gdd + SSI_GDD_CSSA_REG(lch)); + writew_relaxed(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length), + gdd + SSI_GDD_CEN_REG(lch)); + + spin_lock_bh(&omap_ssi->lock); + tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + tmp |= SSI_GDD_LCH(lch); + writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + spin_unlock_bh(&omap_ssi->lock); + writew(ccr, gdd + SSI_GDD_CCR_REG(lch)); + msg->status = HSI_STATUS_PROCEEDING; + + return 0; +} + +static int ssi_start_pio(struct hsi_msg *msg) +{ + struct hsi_port *port = hsi_get_port(msg->cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + u32 val; + + pm_runtime_get_sync(omap_port->pdev); + if (msg->ttype == HSI_MSG_WRITE) { + val = SSI_DATAACCEPT(msg->channel); + /* Hold clocks for pio writes */ + pm_runtime_get_sync(omap_port->pdev); + } else { + val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED; + } + dev_dbg(&port->device, "Single %s transfer\n", + msg->ttype ? "write" : "read"); + val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + pm_runtime_put_sync(omap_port->pdev); + msg->actual_len = 0; + msg->status = HSI_STATUS_PROCEEDING; + + return 0; +} + +static int ssi_start_transfer(struct list_head *queue) +{ + struct hsi_msg *msg; + int lch = -1; + + if (list_empty(queue)) + return 0; + msg = list_first_entry(queue, struct hsi_msg, link); + if (msg->status != HSI_STATUS_QUEUED) + return 0; + if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32))) + lch = ssi_claim_lch(msg); + if (lch >= 0) + return ssi_start_dma(msg, lch); + else + return ssi_start_pio(msg); +} + +static int ssi_async_break(struct hsi_msg *msg) +{ + struct hsi_port *port = hsi_get_port(msg->cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + int err = 0; + u32 tmp; + + pm_runtime_get_sync(omap_port->pdev); + if (msg->ttype == HSI_MSG_WRITE) { + if (omap_port->sst.mode != SSI_MODE_FRAME) { + err = -EINVAL; + goto out; + } + writel(1, omap_port->sst_base + SSI_SST_BREAK_REG); + msg->status = HSI_STATUS_COMPLETED; + msg->complete(msg); + } else { + if (omap_port->ssr.mode != SSI_MODE_FRAME) { + err = -EINVAL; + goto out; + } + spin_lock_bh(&omap_port->lock); + tmp = readl(omap_ssi->sys + + SSI_MPU_ENABLE_REG(port->num, 0)); + writel(tmp | SSI_BREAKDETECTED, + omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + msg->status = HSI_STATUS_PROCEEDING; + list_add_tail(&msg->link, &omap_port->brkqueue); + spin_unlock_bh(&omap_port->lock); + } +out: + pm_runtime_put_sync(omap_port->pdev); + + return err; +} + +static int ssi_async(struct hsi_msg *msg) +{ + struct hsi_port *port = hsi_get_port(msg->cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct list_head *queue; + int err = 0; + + BUG_ON(!msg); + + if (msg->sgt.nents > 1) + return -ENOSYS; /* TODO: Add sg support */ + + if (msg->break_frame) + return ssi_async_break(msg); + + if (msg->ttype) { + BUG_ON(msg->channel >= omap_port->sst.channels); + queue = &omap_port->txqueue[msg->channel]; + } else { + BUG_ON(msg->channel >= omap_port->ssr.channels); + queue = &omap_port->rxqueue[msg->channel]; + } + msg->status = HSI_STATUS_QUEUED; + spin_lock_bh(&omap_port->lock); + list_add_tail(&msg->link, queue); + err = ssi_start_transfer(queue); + if (err < 0) { + list_del(&msg->link); + msg->status = HSI_STATUS_ERROR; + } + spin_unlock_bh(&omap_port->lock); + dev_dbg(&port->device, "msg status %d ttype %d ch %d\n", + msg->status, msg->ttype, msg->channel); + + return err; +} + +static u32 ssi_calculate_div(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + u32 tx_fckrate = (u32) omap_ssi->fck_rate; + + /* / 2 : SSI TX clock is always half of the SSI functional clock */ + tx_fckrate >>= 1; + /* Round down when tx_fckrate % omap_ssi->max_speed == 0 */ + tx_fckrate--; + dev_dbg(&ssi->device, "TX div %d for fck_rate %lu Khz speed %d Kb/s\n", + tx_fckrate / omap_ssi->max_speed, omap_ssi->fck_rate, + omap_ssi->max_speed); + + return tx_fckrate / omap_ssi->max_speed; +} + +static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl) +{ + struct list_head *node, *tmp; + struct hsi_msg *msg; + + list_for_each_safe(node, tmp, queue) { + msg = list_entry(node, struct hsi_msg, link); + if ((cl) && (cl != msg->cl)) + continue; + list_del(node); + pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n", + msg->channel, msg, msg->sgt.sgl->length, + msg->ttype, msg->context); + if (msg->destructor) + msg->destructor(msg); + else + hsi_free_msg(msg); + } +} + +static int ssi_setup(struct hsi_client *cl) +{ + struct hsi_port *port = to_hsi_port(cl->device.parent); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *sst = omap_port->sst_base; + void __iomem *ssr = omap_port->ssr_base; + u32 div; + u32 val; + int err = 0; + + pm_runtime_get_sync(omap_port->pdev); + spin_lock_bh(&omap_port->lock); + if (cl->tx_cfg.speed) + omap_ssi->max_speed = cl->tx_cfg.speed; + div = ssi_calculate_div(ssi); + if (div > SSI_MAX_DIVISOR) { + dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n", + cl->tx_cfg.speed, div); + err = -EINVAL; + goto out; + } + /* Set TX/RX module to sleep to stop TX/RX during cfg update */ + writel_relaxed(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG); + writel_relaxed(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG); + /* Flush posted write */ + val = readl(ssr + SSI_SSR_MODE_REG); + /* TX */ + writel_relaxed(31, sst + SSI_SST_FRAMESIZE_REG); + writel_relaxed(div, sst + SSI_SST_DIVISOR_REG); + writel_relaxed(cl->tx_cfg.num_hw_channels, sst + SSI_SST_CHANNELS_REG); + writel_relaxed(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG); + writel_relaxed(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG); + /* RX */ + writel_relaxed(31, ssr + SSI_SSR_FRAMESIZE_REG); + writel_relaxed(cl->rx_cfg.num_hw_channels, ssr + SSI_SSR_CHANNELS_REG); + writel_relaxed(0, ssr + SSI_SSR_TIMEOUT_REG); + /* Cleanup the break queue if we leave FRAME mode */ + if ((omap_port->ssr.mode == SSI_MODE_FRAME) && + (cl->rx_cfg.mode != SSI_MODE_FRAME)) + ssi_flush_queue(&omap_port->brkqueue, cl); + writel_relaxed(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG); + omap_port->channels = max(cl->rx_cfg.num_hw_channels, + cl->tx_cfg.num_hw_channels); + /* Shadow registering for OFF mode */ + /* SST */ + omap_port->sst.divisor = div; + omap_port->sst.frame_size = 31; + omap_port->sst.channels = cl->tx_cfg.num_hw_channels; + omap_port->sst.arb_mode = cl->tx_cfg.arb_mode; + omap_port->sst.mode = cl->tx_cfg.mode; + /* SSR */ + omap_port->ssr.frame_size = 31; + omap_port->ssr.timeout = 0; + omap_port->ssr.channels = cl->rx_cfg.num_hw_channels; + omap_port->ssr.mode = cl->rx_cfg.mode; +out: + spin_unlock_bh(&omap_port->lock); + pm_runtime_put_sync(omap_port->pdev); + + return err; +} + +static int ssi_flush(struct hsi_client *cl) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_msg *msg; + void __iomem *sst = omap_port->sst_base; + void __iomem *ssr = omap_port->ssr_base; + unsigned int i; + u32 err; + + pm_runtime_get_sync(omap_port->pdev); + spin_lock_bh(&omap_port->lock); + /* Stop all DMA transfers */ + for (i = 0; i < SSI_MAX_GDD_LCH; i++) { + msg = omap_ssi->gdd_trn[i].msg; + if (!msg || (port != hsi_get_port(msg->cl))) + continue; + writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); + if (msg->ttype == HSI_MSG_READ) + pm_runtime_put_sync(omap_port->pdev); + omap_ssi->gdd_trn[i].msg = NULL; + } + /* Flush all SST buffers */ + writel_relaxed(0, sst + SSI_SST_BUFSTATE_REG); + writel_relaxed(0, sst + SSI_SST_TXSTATE_REG); + /* Flush all SSR buffers */ + writel_relaxed(0, ssr + SSI_SSR_RXSTATE_REG); + writel_relaxed(0, ssr + SSI_SSR_BUFSTATE_REG); + /* Flush all errors */ + err = readl(ssr + SSI_SSR_ERROR_REG); + writel_relaxed(err, ssr + SSI_SSR_ERRORACK_REG); + /* Flush break */ + writel_relaxed(0, ssr + SSI_SSR_BREAK_REG); + /* Clear interrupts */ + writel_relaxed(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel_relaxed(0xffffff00, + omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + writel_relaxed(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG); + /* Dequeue all pending requests */ + for (i = 0; i < omap_port->channels; i++) { + /* Release write clocks */ + if (!list_empty(&omap_port->txqueue[i])) + pm_runtime_put_sync(omap_port->pdev); + ssi_flush_queue(&omap_port->txqueue[i], NULL); + ssi_flush_queue(&omap_port->rxqueue[i], NULL); + } + ssi_flush_queue(&omap_port->brkqueue, NULL); + spin_unlock_bh(&omap_port->lock); + pm_runtime_put_sync(omap_port->pdev); + + return 0; +} + +static int ssi_start_tx(struct hsi_client *cl) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount); + + spin_lock_bh(&omap_port->wk_lock); + if (omap_port->wk_refcount++) { + spin_unlock_bh(&omap_port->wk_lock); + return 0; + } + pm_runtime_get_sync(omap_port->pdev); /* Grab clocks */ + writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); + spin_unlock_bh(&omap_port->wk_lock); + + return 0; +} + +static int ssi_stop_tx(struct hsi_client *cl) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount); + + spin_lock_bh(&omap_port->wk_lock); + BUG_ON(!omap_port->wk_refcount); + if (--omap_port->wk_refcount) { + spin_unlock_bh(&omap_port->wk_lock); + return 0; + } + writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); + pm_runtime_put_sync(omap_port->pdev); /* Release clocks */ + spin_unlock_bh(&omap_port->wk_lock); + + return 0; +} + +static void ssi_transfer(struct omap_ssi_port *omap_port, + struct list_head *queue) +{ + struct hsi_msg *msg; + int err = -1; + + spin_lock_bh(&omap_port->lock); + while (err < 0) { + err = ssi_start_transfer(queue); + if (err < 0) { + msg = list_first_entry(queue, struct hsi_msg, link); + msg->status = HSI_STATUS_ERROR; + msg->actual_len = 0; + list_del(&msg->link); + spin_unlock_bh(&omap_port->lock); + msg->complete(msg); + spin_lock_bh(&omap_port->lock); + } + } + spin_unlock_bh(&omap_port->lock); +} + +static void ssi_cleanup_queues(struct hsi_client *cl) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_msg *msg; + unsigned int i; + u32 rxbufstate = 0; + u32 txbufstate = 0; + u32 status = SSI_ERROROCCURED; + u32 tmp; + + ssi_flush_queue(&omap_port->brkqueue, cl); + if (list_empty(&omap_port->brkqueue)) + status |= SSI_BREAKDETECTED; + + for (i = 0; i < omap_port->channels; i++) { + if (list_empty(&omap_port->txqueue[i])) + continue; + msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg, + link); + if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { + txbufstate |= (1 << i); + status |= SSI_DATAACCEPT(i); + /* Release the clocks writes, also GDD ones */ + pm_runtime_put_sync(omap_port->pdev); + } + ssi_flush_queue(&omap_port->txqueue[i], cl); + } + for (i = 0; i < omap_port->channels; i++) { + if (list_empty(&omap_port->rxqueue[i])) + continue; + msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg, + link); + if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { + rxbufstate |= (1 << i); + status |= SSI_DATAAVAILABLE(i); + } + ssi_flush_queue(&omap_port->rxqueue[i], cl); + /* Check if we keep the error detection interrupt armed */ + if (!list_empty(&omap_port->rxqueue[i])) + status &= ~SSI_ERROROCCURED; + } + /* Cleanup write buffers */ + tmp = readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG); + tmp &= ~txbufstate; + writel_relaxed(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG); + /* Cleanup read buffers */ + tmp = readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); + tmp &= ~rxbufstate; + writel_relaxed(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); + /* Disarm and ack pending interrupts */ + tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + tmp &= ~status; + writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel_relaxed(status, omap_ssi->sys + + SSI_MPU_STATUS_REG(port->num, 0)); +} + +static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_msg *msg; + unsigned int i; + u32 val = 0; + u32 tmp; + + for (i = 0; i < SSI_MAX_GDD_LCH; i++) { + msg = omap_ssi->gdd_trn[i].msg; + if ((!msg) || (msg->cl != cl)) + continue; + writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); + val |= (1 << i); + /* + * Clock references for write will be handled in + * ssi_cleanup_queues + */ + if (msg->ttype == HSI_MSG_READ) + pm_runtime_put_sync(omap_port->pdev); + omap_ssi->gdd_trn[i].msg = NULL; + } + tmp = readl_relaxed(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + tmp &= ~val; + writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG); +} + +static int ssi_set_port_mode(struct omap_ssi_port *omap_port, u32 mode) +{ + writel(mode, omap_port->sst_base + SSI_SST_MODE_REG); + writel(mode, omap_port->ssr_base + SSI_SSR_MODE_REG); + /* OCP barrier */ + mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); + + return 0; +} + +static int ssi_release(struct hsi_client *cl) +{ + struct hsi_port *port = hsi_get_port(cl); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + + spin_lock_bh(&omap_port->lock); + pm_runtime_get_sync(omap_port->pdev); + /* Stop all the pending DMA requests for that client */ + ssi_cleanup_gdd(ssi, cl); + /* Now cleanup all the queues */ + ssi_cleanup_queues(cl); + pm_runtime_put_sync(omap_port->pdev); + /* If it is the last client of the port, do extra checks and cleanup */ + if (port->claimed <= 1) { + /* + * Drop the clock reference for the incoming wake line + * if it is still kept high by the other side. + */ + if (omap_port->wkin_cken) { + pm_runtime_put_sync(omap_port->pdev); + omap_port->wkin_cken = 0; + } + pm_runtime_get_sync(omap_port->pdev); + /* Stop any SSI TX/RX without a client */ + ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); + omap_port->sst.mode = SSI_MODE_SLEEP; + omap_port->ssr.mode = SSI_MODE_SLEEP; + pm_runtime_put_sync(omap_port->pdev); + WARN_ON(omap_port->wk_refcount != 0); + } + spin_unlock_bh(&omap_port->lock); + + return 0; +} + + + +static void ssi_error(struct hsi_port *port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_msg *msg; + unsigned int i; + u32 err; + u32 val; + u32 tmp; + + /* ACK error */ + err = readl(omap_port->ssr_base + SSI_SSR_ERROR_REG); + dev_err(&port->device, "SSI error: 0x%02x\n", err); + if (!err) { + dev_dbg(&port->device, "spurious SSI error ignored!\n"); + return; + } + spin_lock(&omap_ssi->lock); + /* Cancel all GDD read transfers */ + for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) { + msg = omap_ssi->gdd_trn[i].msg; + if ((msg) && (msg->ttype == HSI_MSG_READ)) { + writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); + val |= (1 << i); + omap_ssi->gdd_trn[i].msg = NULL; + } + } + tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + tmp &= ~val; + writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); + spin_unlock(&omap_ssi->lock); + /* Cancel all PIO read transfers */ + spin_lock(&omap_port->lock); + tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */ + writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + /* ACK error */ + writel_relaxed(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG); + writel_relaxed(SSI_ERROROCCURED, + omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + /* Signal the error all current pending read requests */ + for (i = 0; i < omap_port->channels; i++) { + if (list_empty(&omap_port->rxqueue[i])) + continue; + msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg, + link); + list_del(&msg->link); + msg->status = HSI_STATUS_ERROR; + spin_unlock(&omap_port->lock); + msg->complete(msg); + /* Now restart queued reads if any */ + ssi_transfer(omap_port, &omap_port->rxqueue[i]); + spin_lock(&omap_port->lock); + } + spin_unlock(&omap_port->lock); +} + +static void ssi_break_complete(struct hsi_port *port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct hsi_msg *msg; + struct hsi_msg *tmp; + u32 val; + + dev_dbg(&port->device, "HWBREAK received\n"); + + spin_lock(&omap_port->lock); + val = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + val &= ~SSI_BREAKDETECTED; + writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel_relaxed(0, omap_port->ssr_base + SSI_SSR_BREAK_REG); + writel(SSI_BREAKDETECTED, + omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + spin_unlock(&omap_port->lock); + + list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) { + msg->status = HSI_STATUS_COMPLETED; + spin_lock(&omap_port->lock); + list_del(&msg->link); + spin_unlock(&omap_port->lock); + msg->complete(msg); + } + +} + +static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue) +{ + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_msg *msg; + u32 *buf; + u32 reg; + u32 val; + + spin_lock(&omap_port->lock); + msg = list_first_entry(queue, struct hsi_msg, link); + if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) { + msg->actual_len = 0; + msg->status = HSI_STATUS_PENDING; + } + if (msg->ttype == HSI_MSG_WRITE) + val = SSI_DATAACCEPT(msg->channel); + else + val = SSI_DATAAVAILABLE(msg->channel); + if (msg->status == HSI_STATUS_PROCEEDING) { + buf = sg_virt(msg->sgt.sgl) + msg->actual_len; + if (msg->ttype == HSI_MSG_WRITE) + writel(*buf, omap_port->sst_base + + SSI_SST_BUFFER_CH_REG(msg->channel)); + else + *buf = readl(omap_port->ssr_base + + SSI_SSR_BUFFER_CH_REG(msg->channel)); + dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel, + msg->ttype, *buf); + msg->actual_len += sizeof(*buf); + if (msg->actual_len >= msg->sgt.sgl->length) + msg->status = HSI_STATUS_COMPLETED; + /* + * Wait for the last written frame to be really sent before + * we call the complete callback + */ + if ((msg->status == HSI_STATUS_PROCEEDING) || + ((msg->status == HSI_STATUS_COMPLETED) && + (msg->ttype == HSI_MSG_WRITE))) { + writel(val, omap_ssi->sys + + SSI_MPU_STATUS_REG(port->num, 0)); + spin_unlock(&omap_port->lock); + + return; + } + + } + /* Transfer completed at this point */ + reg = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + if (msg->ttype == HSI_MSG_WRITE) { + /* Release clocks for write transfer */ + pm_runtime_put_sync(omap_port->pdev); + } + reg &= ~val; + writel_relaxed(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + writel_relaxed(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + list_del(&msg->link); + spin_unlock(&omap_port->lock); + msg->complete(msg); + ssi_transfer(omap_port, queue); +} + +static void ssi_pio_tasklet(unsigned long ssi_port) +{ + struct hsi_port *port = (struct hsi_port *)ssi_port; + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *sys = omap_ssi->sys; + unsigned int ch; + u32 status_reg; + + pm_runtime_get_sync(omap_port->pdev); + status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); + status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); + + for (ch = 0; ch < omap_port->channels; ch++) { + if (status_reg & SSI_DATAACCEPT(ch)) + ssi_pio_complete(port, &omap_port->txqueue[ch]); + if (status_reg & SSI_DATAAVAILABLE(ch)) + ssi_pio_complete(port, &omap_port->rxqueue[ch]); + } + if (status_reg & SSI_BREAKDETECTED) + ssi_break_complete(port); + if (status_reg & SSI_ERROROCCURED) + ssi_error(port); + + status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); + status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); + pm_runtime_put_sync(omap_port->pdev); + + if (status_reg) + tasklet_hi_schedule(&omap_port->pio_tasklet); + else + enable_irq(omap_port->irq); +} + +static irqreturn_t ssi_pio_isr(int irq, void *port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + + tasklet_hi_schedule(&omap_port->pio_tasklet); + disable_irq_nosync(irq); + + return IRQ_HANDLED; +} + +static void ssi_wake_tasklet(unsigned long ssi_port) +{ + struct hsi_port *port = (struct hsi_port *)ssi_port; + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + if (ssi_wakein(port)) { + /** + * We can have a quick High-Low-High transition in the line. + * In such a case if we have long interrupt latencies, + * we can miss the low event or get twice a high event. + * This workaround will avoid breaking the clock reference + * count when such a situation ocurrs. + */ + spin_lock(&omap_port->lock); + if (!omap_port->wkin_cken) { + omap_port->wkin_cken = 1; + pm_runtime_get_sync(omap_port->pdev); + } + spin_unlock(&omap_port->lock); + dev_dbg(&ssi->device, "Wake in high\n"); + if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ + writel(SSI_WAKE(0), + omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); + } + hsi_event(port, HSI_EVENT_START_RX); + } else { + dev_dbg(&ssi->device, "Wake in low\n"); + if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ + writel(SSI_WAKE(0), + omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); + } + hsi_event(port, HSI_EVENT_STOP_RX); + spin_lock(&omap_port->lock); + if (omap_port->wkin_cken) { + pm_runtime_put_sync(omap_port->pdev); + omap_port->wkin_cken = 0; + } + spin_unlock(&omap_port->lock); + } +} + +static irqreturn_t ssi_wake_isr(int irq __maybe_unused, void *ssi_port) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(ssi_port); + + tasklet_hi_schedule(&omap_port->wake_tasklet); + + return IRQ_HANDLED; +} + +static int __init ssi_port_irq(struct hsi_port *port, + struct platform_device *pd) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + int err; + + omap_port->irq = platform_get_irq(pd, 0); + if (omap_port->irq < 0) { + dev_err(&port->device, "Port IRQ resource missing\n"); + return omap_port->irq; + } + tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet, + (unsigned long)port); + err = devm_request_irq(&port->device, omap_port->irq, ssi_pio_isr, + 0, "mpu_irq0", port); + if (err < 0) + dev_err(&port->device, "Request IRQ %d failed (%d)\n", + omap_port->irq, err); + return err; +} + +static int __init ssi_wake_irq(struct hsi_port *port, + struct platform_device *pd) +{ + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + int cawake_irq; + int err; + + if (omap_port->wake_gpio == -1) { + omap_port->wake_irq = -1; + return 0; + } + + cawake_irq = gpio_to_irq(omap_port->wake_gpio); + + omap_port->wake_irq = cawake_irq; + tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet, + (unsigned long)port); + err = devm_request_irq(&port->device, cawake_irq, ssi_wake_isr, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "cawake", port); + if (err < 0) + dev_err(&port->device, "Request Wake in IRQ %d failed %d\n", + cawake_irq, err); + err = enable_irq_wake(cawake_irq); + if (err < 0) + dev_err(&port->device, "Enable wake on the wakeline in irq %d failed %d\n", + cawake_irq, err); + + return err; +} + +static void __init ssi_queues_init(struct omap_ssi_port *omap_port) +{ + unsigned int ch; + + for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) { + INIT_LIST_HEAD(&omap_port->txqueue[ch]); + INIT_LIST_HEAD(&omap_port->rxqueue[ch]); + } + INIT_LIST_HEAD(&omap_port->brkqueue); +} + +static int __init ssi_port_get_iomem(struct platform_device *pd, + const char *name, void __iomem **pbase, dma_addr_t *phy) +{ + struct hsi_port *port = platform_get_drvdata(pd); + struct resource *mem; + struct resource *ioarea; + void __iomem *base; + + mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); + if (!mem) { + dev_err(&pd->dev, "IO memory region missing (%s)\n", name); + return -ENXIO; + } + ioarea = devm_request_mem_region(&port->device, mem->start, + resource_size(mem), dev_name(&pd->dev)); + if (!ioarea) { + dev_err(&pd->dev, "%s IO memory region request failed\n", + mem->name); + return -ENXIO; + } + base = devm_ioremap(&port->device, mem->start, resource_size(mem)); + if (!base) { + dev_err(&pd->dev, "%s IO remap failed\n", mem->name); + return -ENXIO; + } + *pbase = base; + + if (phy) + *phy = mem->start; + + return 0; +} + +static int __init ssi_port_probe(struct platform_device *pd) +{ + struct device_node *np = pd->dev.of_node; + struct hsi_port *port; + struct omap_ssi_port *omap_port; + struct hsi_controller *ssi = dev_get_drvdata(pd->dev.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + u32 cawake_gpio = 0; + u32 port_id; + int err; + + dev_dbg(&pd->dev, "init ssi port...\n"); + + err = ref_module(THIS_MODULE, ssi->owner); + if (err) { + dev_err(&pd->dev, "could not increment parent module refcount (err=%d)\n", + err); + return -ENODEV; + } + + if (!ssi->port || !omap_ssi->port) { + dev_err(&pd->dev, "ssi controller not initialized!\n"); + err = -ENODEV; + goto error; + } + + /* get id of first uninitialized port in controller */ + for (port_id = 0; port_id < ssi->num_ports && omap_ssi->port[port_id]; + port_id++) + ; + + if (port_id >= ssi->num_ports) { + dev_err(&pd->dev, "port id out of range!\n"); + err = -ENODEV; + goto error; + } + + port = ssi->port[port_id]; + + if (!np) { + dev_err(&pd->dev, "missing device tree data\n"); + err = -EINVAL; + goto error; + } + + cawake_gpio = of_get_named_gpio(np, "ti,ssi-cawake-gpio", 0); + if (cawake_gpio < 0) { + dev_err(&pd->dev, "DT data is missing cawake gpio (err=%d)\n", + cawake_gpio); + err = -ENODEV; + goto error; + } + + err = devm_gpio_request_one(&port->device, cawake_gpio, GPIOF_DIR_IN, + "cawake"); + if (err) { + dev_err(&pd->dev, "could not request cawake gpio (err=%d)!\n", + err); + err = -ENXIO; + goto error; + } + + omap_port = devm_kzalloc(&port->device, sizeof(*omap_port), GFP_KERNEL); + if (!omap_port) { + err = -ENOMEM; + goto error; + } + omap_port->wake_gpio = cawake_gpio; + omap_port->pdev = &pd->dev; + omap_port->port_id = port_id; + + /* initialize HSI port */ + port->async = ssi_async; + port->setup = ssi_setup; + port->flush = ssi_flush; + port->start_tx = ssi_start_tx; + port->stop_tx = ssi_stop_tx; + port->release = ssi_release; + hsi_port_set_drvdata(port, omap_port); + omap_ssi->port[port_id] = omap_port; + + platform_set_drvdata(pd, port); + + err = ssi_port_get_iomem(pd, "tx", &omap_port->sst_base, + &omap_port->sst_dma); + if (err < 0) + goto error; + err = ssi_port_get_iomem(pd, "rx", &omap_port->ssr_base, + &omap_port->ssr_dma); + if (err < 0) + goto error; + + err = ssi_port_irq(port, pd); + if (err < 0) + goto error; + err = ssi_wake_irq(port, pd); + if (err < 0) + goto error; + + ssi_queues_init(omap_port); + spin_lock_init(&omap_port->lock); + spin_lock_init(&omap_port->wk_lock); + omap_port->dev = &port->device; + + pm_runtime_irq_safe(omap_port->pdev); + pm_runtime_enable(omap_port->pdev); + +#ifdef CONFIG_DEBUG_FS + err = ssi_debug_add_port(omap_port, omap_ssi->dir); + if (err < 0) { + pm_runtime_disable(omap_port->pdev); + goto error; + } +#endif + + hsi_add_clients_from_dt(port, np); + + dev_info(&pd->dev, "ssi port %u successfully initialized (cawake=%d)\n", + port_id, cawake_gpio); + + return 0; + +error: + return err; +} + +static int __exit ssi_port_remove(struct platform_device *pd) +{ + struct hsi_port *port = platform_get_drvdata(pd); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + +#ifdef CONFIG_DEBUG_FS + ssi_debug_remove_port(port); +#endif + + hsi_port_unregister_clients(port); + + tasklet_kill(&omap_port->wake_tasklet); + tasklet_kill(&omap_port->pio_tasklet); + + port->async = hsi_dummy_msg; + port->setup = hsi_dummy_cl; + port->flush = hsi_dummy_cl; + port->start_tx = hsi_dummy_cl; + port->stop_tx = hsi_dummy_cl; + port->release = hsi_dummy_cl; + + omap_ssi->port[omap_port->port_id] = NULL; + platform_set_drvdata(pd, NULL); + pm_runtime_disable(&pd->dev); + + return 0; +} + +#ifdef CONFIG_PM_RUNTIME +static int ssi_save_port_ctx(struct omap_ssi_port *omap_port) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + omap_port->sys_mpu_enable = readl(omap_ssi->sys + + SSI_MPU_ENABLE_REG(port->num, 0)); + + return 0; +} + +static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *base; + + writel_relaxed(omap_port->sys_mpu_enable, + omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + + /* SST context */ + base = omap_port->sst_base; + writel_relaxed(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG); + writel_relaxed(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG); + writel_relaxed(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG); + + /* SSR context */ + base = omap_port->ssr_base; + writel_relaxed(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG); + writel_relaxed(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG); + writel_relaxed(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG); + + return 0; +} + +static int ssi_restore_port_mode(struct omap_ssi_port *omap_port) +{ + u32 mode; + + writel_relaxed(omap_port->sst.mode, + omap_port->sst_base + SSI_SST_MODE_REG); + writel_relaxed(omap_port->ssr.mode, + omap_port->ssr_base + SSI_SSR_MODE_REG); + /* OCP barrier */ + mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); + + return 0; +} + +static int ssi_restore_divisor(struct omap_ssi_port *omap_port) +{ + writel_relaxed(omap_port->sst.divisor, + omap_port->sst_base + SSI_SST_DIVISOR_REG); + + return 0; +} + +static int omap_ssi_port_runtime_suspend(struct device *dev) +{ + struct hsi_port *port = dev_get_drvdata(dev); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(dev, "port runtime suspend!\n"); + + ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); + if (omap_ssi->get_loss) + omap_port->loss_count = + omap_ssi->get_loss(ssi->device.parent); + ssi_save_port_ctx(omap_port); + + return 0; +} + +static int omap_ssi_port_runtime_resume(struct device *dev) +{ + struct hsi_port *port = dev_get_drvdata(dev); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + dev_dbg(dev, "port runtime resume!\n"); + + if ((omap_ssi->get_loss) && (omap_port->loss_count == + omap_ssi->get_loss(ssi->device.parent))) + goto mode; /* We always need to restore the mode & TX divisor */ + + ssi_restore_port_ctx(omap_port); + +mode: + ssi_restore_divisor(omap_port); + ssi_restore_port_mode(omap_port); + + return 0; +} + +static const struct dev_pm_ops omap_ssi_port_pm_ops = { + SET_RUNTIME_PM_OPS(omap_ssi_port_runtime_suspend, + omap_ssi_port_runtime_resume, NULL) +}; + +#define DEV_PM_OPS (&omap_ssi_port_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + + +#ifdef CONFIG_OF +static const struct of_device_id omap_ssi_port_of_match[] = { + { .compatible = "ti,omap3-ssi-port", }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap_ssi_port_of_match); +#else +#define omap_ssi_port_of_match NULL +#endif + +static struct platform_driver ssi_port_pdriver = { + .remove = __exit_p(ssi_port_remove), + .driver = { + .name = "omap_ssi_port", + .owner = THIS_MODULE, + .of_match_table = omap_ssi_port_of_match, + .pm = DEV_PM_OPS, + }, +}; + +module_platform_driver_probe(ssi_port_pdriver, ssi_port_probe); + +MODULE_ALIAS("platform:omap_ssi_port"); +MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); +MODULE_DESCRIPTION("Synchronous Serial Interface Port Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hsi/controllers/omap_ssi_regs.h b/drivers/hsi/controllers/omap_ssi_regs.h new file mode 100644 index 00000000000..08f98dd1d01 --- /dev/null +++ b/drivers/hsi/controllers/omap_ssi_regs.h @@ -0,0 +1,171 @@ +/* Hardware definitions for SSI. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * + * Contact: Carlos Chinea <carlos.chinea@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#ifndef __OMAP_SSI_REGS_H__ +#define __OMAP_SSI_REGS_H__ + +/* + * SSI SYS registers + */ +#define SSI_REVISION_REG 0 +# define SSI_REV_MAJOR 0xf0 +# define SSI_REV_MINOR 0xf +#define SSI_SYSCONFIG_REG 0x10 +# define SSI_AUTOIDLE (1 << 0) +# define SSI_SOFTRESET (1 << 1) +# define SSI_SIDLEMODE_FORCE 0 +# define SSI_SIDLEMODE_NO (1 << 3) +# define SSI_SIDLEMODE_SMART (1 << 4) +# define SSI_SIDLEMODE_MASK 0x18 +# define SSI_MIDLEMODE_FORCE 0 +# define SSI_MIDLEMODE_NO (1 << 12) +# define SSI_MIDLEMODE_SMART (1 << 13) +# define SSI_MIDLEMODE_MASK 0x3000 +#define SSI_SYSSTATUS_REG 0x14 +# define SSI_RESETDONE 1 +#define SSI_MPU_STATUS_REG(port, irq) (0x808 + ((port) * 0x10) + ((irq) * 2)) +#define SSI_MPU_ENABLE_REG(port, irq) (0x80c + ((port) * 0x10) + ((irq) * 8)) +# define SSI_DATAACCEPT(channel) (1 << (channel)) +# define SSI_DATAAVAILABLE(channel) (1 << ((channel) + 8)) +# define SSI_DATAOVERRUN(channel) (1 << ((channel) + 16)) +# define SSI_ERROROCCURED (1 << 24) +# define SSI_BREAKDETECTED (1 << 25) +#define SSI_GDD_MPU_IRQ_STATUS_REG 0x0800 +#define SSI_GDD_MPU_IRQ_ENABLE_REG 0x0804 +# define SSI_GDD_LCH(channel) (1 << (channel)) +#define SSI_WAKE_REG(port) (0xc00 + ((port) * 0x10)) +#define SSI_CLEAR_WAKE_REG(port) (0xc04 + ((port) * 0x10)) +#define SSI_SET_WAKE_REG(port) (0xc08 + ((port) * 0x10)) +# define SSI_WAKE(channel) (1 << (channel)) +# define SSI_WAKE_MASK 0xff + +/* + * SSI SST registers + */ +#define SSI_SST_ID_REG 0 +#define SSI_SST_MODE_REG 4 +# define SSI_MODE_VAL_MASK 3 +# define SSI_MODE_SLEEP 0 +# define SSI_MODE_STREAM 1 +# define SSI_MODE_FRAME 2 +# define SSI_MODE_MULTIPOINTS 3 +#define SSI_SST_FRAMESIZE_REG 8 +# define SSI_FRAMESIZE_DEFAULT 31 +#define SSI_SST_TXSTATE_REG 0xc +# define SSI_TXSTATE_IDLE 0 +#define SSI_SST_BUFSTATE_REG 0x10 +# define SSI_FULL(channel) (1 << (channel)) +#define SSI_SST_DIVISOR_REG 0x18 +# define SSI_MAX_DIVISOR 127 +#define SSI_SST_BREAK_REG 0x20 +#define SSI_SST_CHANNELS_REG 0x24 +# define SSI_CHANNELS_DEFAULT 4 +#define SSI_SST_ARBMODE_REG 0x28 +# define SSI_ARBMODE_ROUNDROBIN 0 +# define SSI_ARBMODE_PRIORITY 1 +#define SSI_SST_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4)) +#define SSI_SST_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4)) + +/* + * SSI SSR registers + */ +#define SSI_SSR_ID_REG 0 +#define SSI_SSR_MODE_REG 4 +#define SSI_SSR_FRAMESIZE_REG 8 +#define SSI_SSR_RXSTATE_REG 0xc +#define SSI_SSR_BUFSTATE_REG 0x10 +# define SSI_NOTEMPTY(channel) (1 << (channel)) +#define SSI_SSR_BREAK_REG 0x1c +#define SSI_SSR_ERROR_REG 0x20 +#define SSI_SSR_ERRORACK_REG 0x24 +#define SSI_SSR_OVERRUN_REG 0x2c +#define SSI_SSR_OVERRUNACK_REG 0x30 +#define SSI_SSR_TIMEOUT_REG 0x34 +# define SSI_TIMEOUT_DEFAULT 0 +#define SSI_SSR_CHANNELS_REG 0x28 +#define SSI_SSR_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4)) +#define SSI_SSR_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4)) + +/* + * SSI GDD registers + */ +#define SSI_GDD_HW_ID_REG 0 +#define SSI_GDD_PPORT_ID_REG 0x10 +#define SSI_GDD_MPORT_ID_REG 0x14 +#define SSI_GDD_PPORT_SR_REG 0x20 +#define SSI_GDD_MPORT_SR_REG 0x24 +# define SSI_ACTIVE_LCH_NUM_MASK 0xff +#define SSI_GDD_TEST_REG 0x40 +# define SSI_TEST 1 +#define SSI_GDD_GCR_REG 0x100 +# define SSI_CLK_AUTOGATING_ON (1 << 3) +# define SSI_FREE (1 << 2) +# define SSI_SWITCH_OFF (1 << 0) +#define SSI_GDD_GRST_REG 0x200 +# define SSI_SWRESET 1 +#define SSI_GDD_CSDP_REG(channel) (0x800 + ((channel) * 0x40)) +# define SSI_DST_BURST_EN_MASK 0xc000 +# define SSI_DST_SINGLE_ACCESS0 0 +# define SSI_DST_SINGLE_ACCESS (1 << 14) +# define SSI_DST_BURST_4x32_BIT (2 << 14) +# define SSI_DST_BURST_8x32_BIT (3 << 14) +# define SSI_DST_MASK 0x1e00 +# define SSI_DST_MEMORY_PORT (8 << 9) +# define SSI_DST_PERIPHERAL_PORT (9 << 9) +# define SSI_SRC_BURST_EN_MASK 0x180 +# define SSI_SRC_SINGLE_ACCESS0 0 +# define SSI_SRC_SINGLE_ACCESS (1 << 7) +# define SSI_SRC_BURST_4x32_BIT (2 << 7) +# define SSI_SRC_BURST_8x32_BIT (3 << 7) +# define SSI_SRC_MASK 0x3c +# define SSI_SRC_MEMORY_PORT (8 << 2) +# define SSI_SRC_PERIPHERAL_PORT (9 << 2) +# define SSI_DATA_TYPE_MASK 3 +# define SSI_DATA_TYPE_S32 2 +#define SSI_GDD_CCR_REG(channel) (0x802 + ((channel) * 0x40)) +# define SSI_DST_AMODE_MASK (3 << 14) +# define SSI_DST_AMODE_CONST 0 +# define SSI_DST_AMODE_POSTINC (1 << 12) +# define SSI_SRC_AMODE_MASK (3 << 12) +# define SSI_SRC_AMODE_CONST 0 +# define SSI_SRC_AMODE_POSTINC (1 << 12) +# define SSI_CCR_ENABLE (1 << 7) +# define SSI_CCR_SYNC_MASK 0x1f +#define SSI_GDD_CICR_REG(channel) (0x804 + ((channel) * 0x40)) +# define SSI_BLOCK_IE (1 << 5) +# define SSI_HALF_IE (1 << 2) +# define SSI_TOUT_IE (1 << 0) +#define SSI_GDD_CSR_REG(channel) (0x806 + ((channel) * 0x40)) +# define SSI_CSR_SYNC (1 << 6) +# define SSI_CSR_BLOCK (1 << 5) +# define SSI_CSR_HALF (1 << 2) +# define SSI_CSR_TOUR (1 << 0) +#define SSI_GDD_CSSA_REG(channel) (0x808 + ((channel) * 0x40)) +#define SSI_GDD_CDSA_REG(channel) (0x80c + ((channel) * 0x40)) +#define SSI_GDD_CEN_REG(channel) (0x810 + ((channel) * 0x40)) +#define SSI_GDD_CSAC_REG(channel) (0x818 + ((channel) * 0x40)) +#define SSI_GDD_CDAC_REG(channel) (0x81a + ((channel) * 0x40)) +#define SSI_GDD_CLNK_CTRL_REG(channel) (0x828 + ((channel) * 0x40)) +# define SSI_ENABLE_LNK (1 << 15) +# define SSI_STOP_LNK (1 << 14) +# define SSI_NEXT_CH_ID_MASK 0xf + +#endif /* __OMAP_SSI_REGS_H__ */ diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c index 749f7b5c817..fe9371271ce 100644 --- a/drivers/hsi/hsi.c +++ b/drivers/hsi/hsi.c @@ -26,6 +26,8 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/notifier.h> +#include <linux/of.h> +#include <linux/of_device.h> #include "hsi_core.h" static ssize_t modalias_show(struct device *dev, @@ -50,7 +52,13 @@ static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) static int hsi_bus_match(struct device *dev, struct device_driver *driver) { - return strcmp(dev_name(dev), driver->name) == 0; + if (of_driver_match_device(dev, driver)) + return true; + + if (strcmp(dev_name(dev), driver->name) == 0) + return true; + + return false; } static struct bus_type hsi_bus_type = { @@ -62,18 +70,37 @@ static struct bus_type hsi_bus_type = { static void hsi_client_release(struct device *dev) { - kfree(to_hsi_client(dev)); + struct hsi_client *cl = to_hsi_client(dev); + + kfree(cl->tx_cfg.channels); + kfree(cl->rx_cfg.channels); + kfree(cl); } -static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info) +struct hsi_client *hsi_new_client(struct hsi_port *port, + struct hsi_board_info *info) { struct hsi_client *cl; + size_t size; cl = kzalloc(sizeof(*cl), GFP_KERNEL); if (!cl) - return; + return NULL; + cl->tx_cfg = info->tx_cfg; + if (cl->tx_cfg.channels) { + size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels); + cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL); + memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size); + } + cl->rx_cfg = info->rx_cfg; + if (cl->rx_cfg.channels) { + size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels); + cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL); + memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size); + } + cl->device.bus = &hsi_bus_type; cl->device.parent = &port->device; cl->device.release = hsi_client_release; @@ -85,7 +112,10 @@ static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info) pr_err("hsi: failed to register client: %s\n", info->name); put_device(&cl->device); } + + return cl; } +EXPORT_SYMBOL_GPL(hsi_new_client); static void hsi_scan_board_info(struct hsi_controller *hsi) { @@ -101,12 +131,209 @@ static void hsi_scan_board_info(struct hsi_controller *hsi) } } -static int hsi_remove_client(struct device *dev, void *data __maybe_unused) +#ifdef CONFIG_OF +static struct hsi_board_info hsi_char_dev_info = { + .name = "hsi_char", +}; + +static int hsi_of_property_parse_mode(struct device_node *client, char *name, + unsigned int *result) +{ + const char *mode; + int err; + + err = of_property_read_string(client, name, &mode); + if (err < 0) + return err; + + if (strcmp(mode, "stream") == 0) + *result = HSI_MODE_STREAM; + else if (strcmp(mode, "frame") == 0) + *result = HSI_MODE_FRAME; + else + return -EINVAL; + + return 0; +} + +static int hsi_of_property_parse_flow(struct device_node *client, char *name, + unsigned int *result) +{ + const char *flow; + int err; + + err = of_property_read_string(client, name, &flow); + if (err < 0) + return err; + + if (strcmp(flow, "synchronized") == 0) + *result = HSI_FLOW_SYNC; + else if (strcmp(flow, "pipeline") == 0) + *result = HSI_FLOW_PIPE; + else + return -EINVAL; + + return 0; +} + +static int hsi_of_property_parse_arb_mode(struct device_node *client, + char *name, unsigned int *result) +{ + const char *arb_mode; + int err; + + err = of_property_read_string(client, name, &arb_mode); + if (err < 0) + return err; + + if (strcmp(arb_mode, "round-robin") == 0) + *result = HSI_ARB_RR; + else if (strcmp(arb_mode, "priority") == 0) + *result = HSI_ARB_PRIO; + else + return -EINVAL; + + return 0; +} + +static void hsi_add_client_from_dt(struct hsi_port *port, + struct device_node *client) +{ + struct hsi_client *cl; + struct hsi_channel channel; + struct property *prop; + char name[32]; + int length, cells, err, i, max_chan, mode; + + cl = kzalloc(sizeof(*cl), GFP_KERNEL); + if (!cl) + return; + + err = of_modalias_node(client, name, sizeof(name)); + if (err) + goto err; + + dev_set_name(&cl->device, "%s", name); + + err = hsi_of_property_parse_mode(client, "hsi-mode", &mode); + if (err) { + err = hsi_of_property_parse_mode(client, "hsi-rx-mode", + &cl->rx_cfg.mode); + if (err) + goto err; + + err = hsi_of_property_parse_mode(client, "hsi-tx-mode", + &cl->tx_cfg.mode); + if (err) + goto err; + } else { + cl->rx_cfg.mode = mode; + cl->tx_cfg.mode = mode; + } + + err = of_property_read_u32(client, "hsi-speed-kbps", + &cl->tx_cfg.speed); + if (err) + goto err; + cl->rx_cfg.speed = cl->tx_cfg.speed; + + err = hsi_of_property_parse_flow(client, "hsi-flow", + &cl->rx_cfg.flow); + if (err) + goto err; + + err = hsi_of_property_parse_arb_mode(client, "hsi-arb-mode", + &cl->rx_cfg.arb_mode); + if (err) + goto err; + + prop = of_find_property(client, "hsi-channel-ids", &length); + if (!prop) { + err = -EINVAL; + goto err; + } + + cells = length / sizeof(u32); + + cl->rx_cfg.num_channels = cells; + cl->tx_cfg.num_channels = cells; + + cl->rx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL); + if (!cl->rx_cfg.channels) { + err = -ENOMEM; + goto err; + } + + cl->tx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL); + if (!cl->tx_cfg.channels) { + err = -ENOMEM; + goto err2; + } + + max_chan = 0; + for (i = 0; i < cells; i++) { + err = of_property_read_u32_index(client, "hsi-channel-ids", i, + &channel.id); + if (err) + goto err3; + + err = of_property_read_string_index(client, "hsi-channel-names", + i, &channel.name); + if (err) + channel.name = NULL; + + if (channel.id > max_chan) + max_chan = channel.id; + + cl->rx_cfg.channels[i] = channel; + cl->tx_cfg.channels[i] = channel; + } + + cl->rx_cfg.num_hw_channels = max_chan + 1; + cl->tx_cfg.num_hw_channels = max_chan + 1; + + cl->device.bus = &hsi_bus_type; + cl->device.parent = &port->device; + cl->device.release = hsi_client_release; + cl->device.of_node = client; + + if (device_register(&cl->device) < 0) { + pr_err("hsi: failed to register client: %s\n", name); + put_device(&cl->device); + goto err3; + } + + return; + +err3: + kfree(cl->tx_cfg.channels); +err2: + kfree(cl->rx_cfg.channels); +err: + kfree(cl); + pr_err("hsi client: missing or incorrect of property: err=%d\n", err); +} + +void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients) +{ + struct device_node *child; + + /* register hsi-char device */ + hsi_new_client(port, &hsi_char_dev_info); + + for_each_available_child_of_node(clients, child) + hsi_add_client_from_dt(port, child); +} +EXPORT_SYMBOL_GPL(hsi_add_clients_from_dt); +#endif + +int hsi_remove_client(struct device *dev, void *data __maybe_unused) { device_unregister(dev); return 0; } +EXPORT_SYMBOL_GPL(hsi_remove_client); static int hsi_remove_port(struct device *dev, void *data __maybe_unused) { @@ -130,6 +357,16 @@ static void hsi_port_release(struct device *dev) } /** + * hsi_unregister_port - Unregister an HSI port + * @port: The HSI port to unregister + */ +void hsi_port_unregister_clients(struct hsi_port *port) +{ + device_for_each_child(&port->device, NULL, hsi_remove_client); +} +EXPORT_SYMBOL_GPL(hsi_port_unregister_clients); + +/** * hsi_unregister_controller - Unregister an HSI controller * @hsi: The HSI controller to register */ @@ -472,7 +709,7 @@ int hsi_unregister_port_event(struct hsi_client *cl) EXPORT_SYMBOL_GPL(hsi_unregister_port_event); /** - * hsi_event -Notifies clients about port events + * hsi_event - Notifies clients about port events * @port: Port where the event occurred * @event: The event type * @@ -492,6 +729,32 @@ int hsi_event(struct hsi_port *port, unsigned long event) } EXPORT_SYMBOL_GPL(hsi_event); +/** + * hsi_get_channel_id_by_name - acquire channel id by channel name + * @cl: HSI client, which uses the channel + * @name: name the channel is known under + * + * Clients can call this function to get the hsi channel ids similar to + * requesting IRQs or GPIOs by name. This function assumes the same + * channel configuration is used for RX and TX. + * + * Returns -errno on error or channel id on success. + */ +int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name) +{ + int i; + + if (!cl->rx_cfg.channels) + return -ENOENT; + + for (i = 0; i < cl->rx_cfg.num_channels; i++) + if (!strcmp(cl->rx_cfg.channels[i].name, name)) + return cl->rx_cfg.channels[i].id; + + return -ENXIO; +} +EXPORT_SYMBOL_GPL(hsi_get_channel_id_by_name); + static int __init hsi_init(void) { return bus_register(&hsi_bus_type); |