diff options
Diffstat (limited to 'drivers/ps3/vuart.c')
| -rw-r--r-- | drivers/ps3/vuart.c | 965 |
1 files changed, 965 insertions, 0 deletions
diff --git a/drivers/ps3/vuart.c b/drivers/ps3/vuart.c new file mode 100644 index 00000000000..6974f65bcda --- /dev/null +++ b/drivers/ps3/vuart.c @@ -0,0 +1,965 @@ +/* + * PS3 virtual uart + * + * Copyright (C) 2006 Sony Computer Entertainment Inc. + * Copyright 2006 Sony Corp. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <asm/ps3.h> + +#include <asm/lv1call.h> +#include <asm/bitops.h> + +#include "vuart.h" + +MODULE_AUTHOR("Sony Corporation"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ps3 vuart"); + +/** + * vuart - An inter-partition data link service. + * port 0: PS3 AV Settings. + * port 2: PS3 System Manager. + * + * The vuart provides a bi-directional byte stream data link between logical + * partitions. Its primary role is as a communications link between the guest + * OS and the system policy module. The current HV does not support any + * connections other than those listed. + */ + +enum {PORT_COUNT = 3,}; + +enum vuart_param { + PARAM_TX_TRIGGER = 0, + PARAM_RX_TRIGGER = 1, + PARAM_INTERRUPT_MASK = 2, + PARAM_RX_BUF_SIZE = 3, /* read only */ + PARAM_RX_BYTES = 4, /* read only */ + PARAM_TX_BUF_SIZE = 5, /* read only */ + PARAM_TX_BYTES = 6, /* read only */ + PARAM_INTERRUPT_STATUS = 7, /* read only */ +}; + +enum vuart_interrupt_bit { + INTERRUPT_BIT_TX = 0, + INTERRUPT_BIT_RX = 1, + INTERRUPT_BIT_DISCONNECT = 2, +}; + +enum vuart_interrupt_mask { + INTERRUPT_MASK_TX = 1, + INTERRUPT_MASK_RX = 2, + INTERRUPT_MASK_DISCONNECT = 4, +}; + +/** + * struct ports_bmp - bitmap indicating ports needing service. + * + * A 256 bit read only bitmap indicating ports needing service. Do not write + * to these bits. Must not cross a page boundary. + */ + +struct ports_bmp { + u64 status; + u64 unused[3]; +} __attribute__ ((aligned (32))); + +/* redefine dev_dbg to do a syntax check */ + +#if !defined(DEBUG) +#undef dev_dbg +static inline int __attribute__ ((format (printf, 2, 3))) dev_dbg( + const struct device *_dev, const char *fmt, ...) {return 0;} +#endif + +#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__) +static void __attribute__ ((unused)) _dump_ports_bmp( + const struct ports_bmp* bmp, const char* func, int line) +{ + pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status); +} + +static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id, + unsigned int *port_number) +{ + switch(match_id) { + case PS3_MATCH_ID_AV_SETTINGS: + *port_number = 0; + return 0; + case PS3_MATCH_ID_SYSTEM_MANAGER: + *port_number = 2; + return 0; + default: + WARN_ON(1); + *port_number = UINT_MAX; + return -EINVAL; + }; +} + +#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__) +static void __attribute__ ((unused)) _dump_port_params(unsigned int port_number, + const char* func, int line) +{ +#if defined(DEBUG) + static const char *strings[] = { + "tx_trigger ", + "rx_trigger ", + "interrupt_mask ", + "rx_buf_size ", + "rx_bytes ", + "tx_buf_size ", + "tx_bytes ", + "interrupt_status", + }; + int result; + unsigned int i; + u64 value; + + for (i = 0; i < ARRAY_SIZE(strings); i++) { + result = lv1_get_virtual_uart_param(port_number, i, &value); + + if (result) { + pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line, + port_number, strings[i], ps3_result(result)); + continue; + } + pr_debug("%s:%d: port_%u: %s = %lxh\n", + func, line, port_number, strings[i], value); + } +#endif +} + +struct vuart_triggers { + unsigned long rx; + unsigned long tx; +}; + +int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev, + struct vuart_triggers *trig) +{ + int result; + unsigned long size; + unsigned long val; + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_TX_TRIGGER, &trig->tx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BUF_SIZE, &size); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_TRIGGER, &val); + + if (result) { + dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + trig->rx = size - val; + + dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__, + trig->tx, trig->rx); + + return result; +} + +int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx, + unsigned int rx) +{ + int result; + unsigned long size; + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_TX_TRIGGER, tx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BUF_SIZE, &size); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_RX_TRIGGER, size - rx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__, + tx, rx); + + return result; +} + +static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev, + unsigned long *bytes_waiting) +{ + int result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BYTES, bytes_waiting); + + if (result) + dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, + *bytes_waiting); + return result; +} + +static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev, + unsigned long mask) +{ + int result; + + dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask); + + dev->interrupt_mask = mask; + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_INTERRUPT_MASK, dev->interrupt_mask); + + if (result) + dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + return result; +} + +static int ps3_vuart_get_interrupt_mask(struct ps3_vuart_port_device *dev, + unsigned long *status) +{ + int result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_INTERRUPT_STATUS, status); + + if (result) + dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n", + __func__, __LINE__, dev->interrupt_mask, *status, + dev->interrupt_mask & *status); + + return result; +} + +int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_TX) ? 0 + : ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + | INTERRUPT_MASK_TX); +} + +int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_RX) ? 0 + : ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + | INTERRUPT_MASK_RX); +} + +int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0 + : ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + | INTERRUPT_MASK_DISCONNECT); +} + +int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_TX) + ? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + & ~INTERRUPT_MASK_TX) : 0; +} + +int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_RX) + ? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + & ~INTERRUPT_MASK_RX) : 0; +} + +int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev) +{ + return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT) + ? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask + & ~INTERRUPT_MASK_DISCONNECT) : 0; +} + +/** + * ps3_vuart_raw_write - Low level write helper. + * + * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write. + */ + +static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev, + const void* buf, unsigned int bytes, unsigned long *bytes_written) +{ + int result; + + dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes); + + result = lv1_write_virtual_uart(dev->port_number, + ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written); + + if (result) { + dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: " + "%s\n", __func__, __LINE__, ps3_result(result)); + return result; + } + + dev->stats.bytes_written += *bytes_written; + + dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, + __LINE__, *bytes_written, bytes, dev->stats.bytes_written); + + return result; +} + +/** + * ps3_vuart_raw_read - Low level read helper. + * + * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read. + */ + +static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf, + unsigned int bytes, unsigned long *bytes_read) +{ + int result; + + dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes); + + result = lv1_read_virtual_uart(dev->port_number, + ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read); + + if (result) { + dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + dev->stats.bytes_read += *bytes_read; + + dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__, + *bytes_read, bytes, dev->stats.bytes_read); + + return result; +} + +/** + * struct list_buffer - An element for a port device fifo buffer list. + */ + +struct list_buffer { + struct list_head link; + const unsigned char *head; + const unsigned char *tail; + unsigned long dbg_number; + unsigned char data[]; +}; + +/** + * ps3_vuart_write - the entry point for writing data to a port + * + * If the port is idle on entry as much of the incoming data is written to + * the port as the port will accept. Otherwise a list buffer is created + * and any remaning incoming data is copied to that buffer. The buffer is + * then enqueued for transmision via the transmit interrupt. + */ + +int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf, + unsigned int bytes) +{ + static unsigned long dbg_number; + int result; + unsigned long flags; + struct list_buffer *lb; + + dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, + bytes, bytes); + + spin_lock_irqsave(&dev->tx_list.lock, flags); + + if (list_empty(&dev->tx_list.head)) { + unsigned long bytes_written; + + result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written); + + spin_unlock_irqrestore(&dev->tx_list.lock, flags); + + if (result) { + dev_dbg(&dev->core, + "%s:%d: ps3_vuart_raw_write failed\n", + __func__, __LINE__); + return result; + } + + if (bytes_written == bytes) { + dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n", + __func__, __LINE__, bytes); + return 0; + } + + bytes -= bytes_written; + buf += bytes_written; + } else + spin_unlock_irqrestore(&dev->tx_list.lock, flags); + + lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL); + + if (!lb) { + return -ENOMEM; + } + + memcpy(lb->data, buf, bytes); + lb->head = lb->data; + lb->tail = lb->data + bytes; + lb->dbg_number = ++dbg_number; + + spin_lock_irqsave(&dev->tx_list.lock, flags); + list_add_tail(&lb->link, &dev->tx_list.head); + ps3_vuart_enable_interrupt_tx(dev); + spin_unlock_irqrestore(&dev->tx_list.lock, flags); + + dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes); + + return 0; +} + +/** + * ps3_vuart_read - the entry point for reading data from a port + * + * If enough bytes to satisfy the request are held in the buffer list those + * bytes are dequeued and copied to the caller's buffer. Emptied list buffers + * are retiered. If the request cannot be statified by bytes held in the list + * buffers -EAGAIN is returned. + */ + +int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf, + unsigned int bytes) +{ + unsigned long flags; + struct list_buffer *lb, *n; + unsigned long bytes_read; + + dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, + bytes, bytes); + + spin_lock_irqsave(&dev->rx_list.lock, flags); + + if (dev->rx_list.bytes_held < bytes) { + spin_unlock_irqrestore(&dev->rx_list.lock, flags); + dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n", + __func__, __LINE__, bytes - dev->rx_list.bytes_held); + return -EAGAIN; + } + + list_for_each_entry_safe(lb, n, &dev->rx_list.head, link) { + bytes_read = min((unsigned int)(lb->tail - lb->head), bytes); + + memcpy(buf, lb->head, bytes_read); + buf += bytes_read; + bytes -= bytes_read; + dev->rx_list.bytes_held -= bytes_read; + + if (bytes_read < lb->tail - lb->head) { + lb->head += bytes_read; + spin_unlock_irqrestore(&dev->rx_list.lock, flags); + + dev_dbg(&dev->core, + "%s:%d: dequeued buf_%lu, %lxh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes_read); + return 0; + } + + dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__, + lb->dbg_number); + + list_del(&lb->link); + kfree(lb); + } + spin_unlock_irqrestore(&dev->rx_list.lock, flags); + + dev_dbg(&dev->core, "%s:%d: dequeued buf_%lu, %xh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes); + + return 0; +} + +/** + * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler + * + * Services the transmit interrupt for the port. Writes as much data from the + * buffer list as the port will accept. Retires any emptied list buffers and + * adjusts the final list buffer state for a partial write. + */ + +static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev) +{ + int result = 0; + unsigned long flags; + struct list_buffer *lb, *n; + unsigned long bytes_total = 0; + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + spin_lock_irqsave(&dev->tx_list.lock, flags); + + list_for_each_entry_safe(lb, n, &dev->tx_list.head, link) { + + unsigned long bytes_written; + + result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head, + &bytes_written); + + if (result) { + dev_dbg(&dev->core, + "%s:%d: ps3_vuart_raw_write failed\n", + __func__, __LINE__); + break; + } + + bytes_total += bytes_written; + + if (bytes_written < lb->tail - lb->head) { + lb->head += bytes_written; + dev_dbg(&dev->core, + "%s:%d cleared buf_%lu, %lxh bytes\n", + __func__, __LINE__, lb->dbg_number, + bytes_written); + goto port_full; + } + + dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__, + lb->dbg_number); + + list_del(&lb->link); + kfree(lb); + } + + ps3_vuart_disable_interrupt_tx(dev); +port_full: + spin_unlock_irqrestore(&dev->tx_list.lock, flags); + dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n", + __func__, __LINE__, bytes_total); + return result; +} + +/** + * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler + * + * Services the receive interrupt for the port. Creates a list buffer and + * copies all waiting port data to that buffer and enqueues the buffer in the + * buffer list. Buffer list data is dequeued via ps3_vuart_read. + */ + +static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev) +{ + static unsigned long dbg_number; + int result = 0; + unsigned long flags; + struct list_buffer *lb; + unsigned long bytes; + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes); + + if (result) + return -EIO; + + BUG_ON(!bytes); + + /* add some extra space for recently arrived data */ + + bytes += 128; + + lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC); + + if (!lb) + return -ENOMEM; + + ps3_vuart_raw_read(dev, lb->data, bytes, &bytes); + + lb->head = lb->data; + lb->tail = lb->data + bytes; + lb->dbg_number = ++dbg_number; + + spin_lock_irqsave(&dev->rx_list.lock, flags); + list_add_tail(&lb->link, &dev->rx_list.head); + dev->rx_list.bytes_held += bytes; + spin_unlock_irqrestore(&dev->rx_list.lock, flags); + + dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %lxh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes); + + return 0; +} + +static int ps3_vuart_handle_interrupt_disconnect( + struct ps3_vuart_port_device *dev) +{ + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + BUG_ON("no support"); + return -1; +} + +/** + * ps3_vuart_handle_port_interrupt - second stage interrupt handler + * + * Services any pending interrupt types for the port. Passes control to the + * third stage type specific interrupt handler. Returns control to the first + * stage handler after one iteration. + */ + +static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev) +{ + int result; + unsigned long status; + + result = ps3_vuart_get_interrupt_mask(dev, &status); + + if (result) + return result; + + dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__, + status); + + if (status & INTERRUPT_MASK_DISCONNECT) { + dev->stats.disconnect_interrupts++; + result = ps3_vuart_handle_interrupt_disconnect(dev); + if (result) + ps3_vuart_disable_interrupt_disconnect(dev); + } + + if (status & INTERRUPT_MASK_TX) { + dev->stats.tx_interrupts++; + result = ps3_vuart_handle_interrupt_tx(dev); + if (result) + ps3_vuart_disable_interrupt_tx(dev); + } + + if (status & INTERRUPT_MASK_RX) { + dev->stats.rx_interrupts++; + result = ps3_vuart_handle_interrupt_rx(dev); + if (result) + ps3_vuart_disable_interrupt_rx(dev); + } + + return 0; +} + +struct vuart_private { + unsigned int in_use; + unsigned int virq; + struct ps3_vuart_port_device *devices[PORT_COUNT]; + const struct ports_bmp bmp; +}; + +/** + * ps3_vuart_irq_handler - first stage interrupt handler + * + * Loops finding any interrupting port and its associated instance data. + * Passes control to the second stage port specific interrupt handler. Loops + * until all outstanding interrupts are serviced. + */ + +static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private) +{ + struct vuart_private *private; + + BUG_ON(!_private); + private = (struct vuart_private *)_private; + + while (1) { + unsigned int port; + + dump_ports_bmp(&private->bmp); + + port = (BITS_PER_LONG - 1) - __ilog2(private->bmp.status); + + if (port == BITS_PER_LONG) + break; + + BUG_ON(port >= PORT_COUNT); + BUG_ON(!private->devices[port]); + + ps3_vuart_handle_port_interrupt(private->devices[port]); + } + + return IRQ_HANDLED; +} + +static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv) +{ + int result; + struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv); + struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev); + + result = dev->match_id == drv->match_id; + + dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, + __LINE__, dev->match_id, dev->core.bus_id, drv->match_id, + drv->core.name, (result ? "match" : "miss")); + + return result; +} + +static struct vuart_private vuart_private; + +static int ps3_vuart_probe(struct device *_dev) +{ + int result; + unsigned long tmp; + struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev); + struct ps3_vuart_port_driver *drv = + to_ps3_vuart_port_driver(_dev->driver); + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + BUG_ON(!drv); + + result = ps3_vuart_match_id_to_port(dev->match_id, &dev->port_number); + + if (result) { + dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n", + __func__, __LINE__, dev->match_id); + result = -EINVAL; + goto fail_match; + } + + if (vuart_private.devices[dev->port_number]) { + dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__, + __LINE__, dev->port_number); + result = -EBUSY; + goto fail_match; + } + + vuart_private.devices[dev->port_number] = dev; + + INIT_LIST_HEAD(&dev->tx_list.head); + spin_lock_init(&dev->tx_list.lock); + INIT_LIST_HEAD(&dev->rx_list.head); + spin_lock_init(&dev->rx_list.lock); + + vuart_private.in_use++; + if (vuart_private.in_use == 1) { + result = ps3_alloc_vuart_irq((void*)&vuart_private.bmp.status, + &vuart_private.virq); + + if (result) { + dev_dbg(&dev->core, + "%s:%d: ps3_alloc_vuart_irq failed (%d)\n", + __func__, __LINE__, result); + result = -EPERM; + goto fail_alloc_irq; + } + + result = request_irq(vuart_private.virq, ps3_vuart_irq_handler, + IRQF_DISABLED, "vuart", &vuart_private); + + if (result) { + dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n", + __func__, __LINE__, result); + goto fail_request_irq; + } + } + + ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX); + + /* clear stale pending interrupts */ + ps3_vuart_get_interrupt_mask(dev, &tmp); + + ps3_vuart_set_triggers(dev, 1, 1); + + if (drv->probe) + result = drv->probe(dev); + else { + result = 0; + dev_info(&dev->core, "%s:%d: no probe method\n", __func__, + __LINE__); + } + + if (result) { + dev_dbg(&dev->core, "%s:%d: drv->probe failed\n", + __func__, __LINE__); + goto fail_probe; + } + + return result; + +fail_probe: +fail_request_irq: + vuart_private.in_use--; + if (!vuart_private.in_use) { + ps3_free_vuart_irq(vuart_private.virq); + vuart_private.virq = NO_IRQ; + } +fail_alloc_irq: +fail_match: + dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__); + return result; +} + +static int ps3_vuart_remove(struct device *_dev) +{ + struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev); + struct ps3_vuart_port_driver *drv = + to_ps3_vuart_port_driver(_dev->driver); + + dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__, + dev->core.bus_id); + + BUG_ON(vuart_private.in_use < 1); + + if (drv->remove) + drv->remove(dev); + else + dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__, + __LINE__, dev->core.bus_id); + + vuart_private.in_use--; + + if (!vuart_private.in_use) { + free_irq(vuart_private.virq, &vuart_private); + ps3_free_vuart_irq(vuart_private.virq); + vuart_private.virq = NO_IRQ; + } + return 0; +} + +/** + * ps3_vuart - The vuart instance. + * + * The vuart is managed as a bus that port devices connect to. + */ + +struct bus_type ps3_vuart = { + .name = "ps3_vuart", + .match = ps3_vuart_match, + .probe = ps3_vuart_probe, + .remove = ps3_vuart_remove, +}; + +int __init ps3_vuart_init(void) +{ + int result; + + pr_debug("%s:%d:\n", __func__, __LINE__); + result = bus_register(&ps3_vuart); + BUG_ON(result); + return result; +} + +void __exit ps3_vuart_exit(void) +{ + pr_debug("%s:%d:\n", __func__, __LINE__); + bus_unregister(&ps3_vuart); +} + +core_initcall(ps3_vuart_init); +module_exit(ps3_vuart_exit); + +/** + * ps3_vuart_port_release_device - Remove a vuart port device. + */ + +static void ps3_vuart_port_release_device(struct device *_dev) +{ + struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev); +#if defined(DEBUG) + memset(dev, 0xad, sizeof(struct ps3_vuart_port_device)); +#endif + kfree(dev); +} + +/** + * ps3_vuart_port_device_register - Add a vuart port device. + */ + +int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev) +{ + int result; + static unsigned int dev_count = 1; + + dev->core.parent = NULL; + dev->core.bus = &ps3_vuart; + dev->core.release = ps3_vuart_port_release_device; + + snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x", + dev_count++); + + dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__); + + result = device_register(&dev->core); + + return result; +} + +EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register); + +/** + * ps3_vuart_port_driver_register - Add a vuart port device driver. + */ + +int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv) +{ + int result; + + pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name); + drv->core.bus = &ps3_vuart; + result = driver_register(&drv->core); + return result; +} + +EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register); + +/** + * ps3_vuart_port_driver_unregister - Remove a vuart port device driver. + */ + +void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv) +{ + driver_unregister(&drv->core); +} + +EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister); |