diff options
| -rw-r--r-- | arch/cris/arch-v32/drivers/sync_serial.c | 1430 |
1 files changed, 791 insertions, 639 deletions
diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c index 5a149134cfb..08a313fc224 100644 --- a/arch/cris/arch-v32/drivers/sync_serial.c +++ b/arch/cris/arch-v32/drivers/sync_serial.c @@ -1,8 +1,7 @@ /* - * Simple synchronous serial port driver for ETRAX FS and Artpec-3. - * - * Copyright (c) 2005 Axis Communications AB + * Simple synchronous serial port driver for ETRAX FS and ARTPEC-3. * + * Copyright (c) 2005, 2008 Axis Communications AB * Author: Mikael Starvik * */ @@ -16,16 +15,17 @@ #include <linux/mutex.h> #include <linux/interrupt.h> #include <linux/poll.h> -#include <linux/init.h> -#include <linux/timer.h> -#include <linux/spinlock.h> +#include <linux/fs.h> +#include <linux/cdev.h> +#include <linux/device.h> #include <linux/wait.h> #include <asm/io.h> -#include <dma.h> +#include <mach/dma.h> #include <pinmux.h> #include <hwregs/reg_rdwr.h> #include <hwregs/sser_defs.h> +#include <hwregs/timer_defs.h> #include <hwregs/dma_defs.h> #include <hwregs/dma.h> #include <hwregs/intr_vect_defs.h> @@ -59,22 +59,23 @@ /* the rest of the data pointed out by Descr1 and set readp to the start */ /* of Descr2 */ -#define SYNC_SERIAL_MAJOR 125 - /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ /* words can be handled */ -#define IN_BUFFER_SIZE 12288 -#define IN_DESCR_SIZE 256 -#define NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE) +#define IN_DESCR_SIZE SSP_INPUT_CHUNK_SIZE +#define NBR_IN_DESCR (8*6) +#define IN_BUFFER_SIZE (IN_DESCR_SIZE * NBR_IN_DESCR) -#define OUT_BUFFER_SIZE 1024*8 #define NBR_OUT_DESCR 8 +#define OUT_BUFFER_SIZE (1024 * NBR_OUT_DESCR) #define DEFAULT_FRAME_RATE 0 #define DEFAULT_WORD_RATE 7 +/* To be removed when we move to pure udev. */ +#define SYNC_SERIAL_MAJOR 125 + /* NOTE: Enabling some debug will likely cause overrun or underrun, - * especially if manual mode is use. + * especially if manual mode is used. */ #define DEBUG(x) #define DEBUGREAD(x) @@ -85,11 +86,28 @@ #define DEBUGTRDMA(x) #define DEBUGOUTBUF(x) -typedef struct sync_port -{ - reg_scope_instances regi_sser; - reg_scope_instances regi_dmain; - reg_scope_instances regi_dmaout; +enum syncser_irq_setup { + no_irq_setup = 0, + dma_irq_setup = 1, + manual_irq_setup = 2, +}; + +struct sync_port { + unsigned long regi_sser; + unsigned long regi_dmain; + unsigned long regi_dmaout; + + /* Interrupt vectors. */ + unsigned long dma_in_intr_vect; /* Used for DMA in. */ + unsigned long dma_out_intr_vect; /* Used for DMA out. */ + unsigned long syncser_intr_vect; /* Used when no DMA. */ + + /* DMA number for in and out. */ + unsigned int dma_in_nbr; + unsigned int dma_out_nbr; + + /* DMA owner. */ + enum dma_owner req_dma; char started; /* 1 if port has been started */ char port_nbr; /* Port 0 or 1 */ @@ -99,22 +117,29 @@ typedef struct sync_port char use_dma; /* 1 if port uses dma */ char tr_running; - char init_irqs; + enum syncser_irq_setup init_irqs; int output; int input; /* Next byte to be read by application */ - volatile unsigned char *volatile readp; + unsigned char *readp; /* Next byte to be written by etrax */ - volatile unsigned char *volatile writep; + unsigned char *writep; unsigned int in_buffer_size; + unsigned int in_buffer_len; unsigned int inbufchunk; - unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32))); - unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32))); - unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32))); - struct dma_descr_data* next_rx_desc; - struct dma_descr_data* prev_rx_desc; + /* Data buffers for in and output. */ + unsigned char out_buffer[OUT_BUFFER_SIZE] __aligned(32); + unsigned char in_buffer[IN_BUFFER_SIZE] __aligned(32); + unsigned char flip[IN_BUFFER_SIZE] __aligned(32); + struct timespec timestamp[NBR_IN_DESCR]; + struct dma_descr_data *next_rx_desc; + struct dma_descr_data *prev_rx_desc; + + struct timeval last_timestamp; + int read_ts_idx; + int write_ts_idx; /* Pointer to the first available descriptor in the ring, * unless active_tr_descr == catch_tr_descr and a dma @@ -135,114 +160,138 @@ typedef struct sync_port /* Number of bytes currently locked for being read by DMA */ int out_buf_count; - dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16))); - dma_descr_context in_context __attribute__ ((__aligned__(32))); - dma_descr_data out_descr[NBR_OUT_DESCR] - __attribute__ ((__aligned__(16))); - dma_descr_context out_context __attribute__ ((__aligned__(32))); + dma_descr_context in_context __aligned(32); + dma_descr_context out_context __aligned(32); + dma_descr_data in_descr[NBR_IN_DESCR] __aligned(16); + dma_descr_data out_descr[NBR_OUT_DESCR] __aligned(16); + wait_queue_head_t out_wait_q; wait_queue_head_t in_wait_q; spinlock_t lock; -} sync_port; +}; static DEFINE_MUTEX(sync_serial_mutex); static int etrax_sync_serial_init(void); static void initialize_port(int portnbr); static inline int sync_data_avail(struct sync_port *port); -static int sync_serial_open(struct inode *, struct file*); -static int sync_serial_release(struct inode*, struct file*); +static int sync_serial_open(struct inode *, struct file *); +static int sync_serial_release(struct inode *, struct file *); static unsigned int sync_serial_poll(struct file *filp, poll_table *wait); -static int sync_serial_ioctl(struct file *, - unsigned int cmd, unsigned long arg); -static ssize_t sync_serial_write(struct file * file, const char * buf, +static long sync_serial_ioctl(struct file *file, + unsigned int cmd, unsigned long arg); +static int sync_serial_ioctl_unlocked(struct file *file, + unsigned int cmd, unsigned long arg); +static ssize_t sync_serial_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos); -static ssize_t sync_serial_read(struct file *file, char *buf, +static ssize_t sync_serial_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); -#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ - (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)) +#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ + defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ + (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ + defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) #define SYNC_SER_DMA +#else +#define SYNC_SER_MANUAL #endif -static void send_word(sync_port* port); -static void start_dma_out(struct sync_port *port, const char *data, int count); -static void start_dma_in(sync_port* port); #ifdef SYNC_SER_DMA +static void start_dma_out(struct sync_port *port, const char *data, int count); +static void start_dma_in(struct sync_port *port); static irqreturn_t tr_interrupt(int irq, void *dev_id); static irqreturn_t rx_interrupt(int irq, void *dev_id); #endif - -#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ - !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ - (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ - !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)) -#define SYNC_SER_MANUAL -#endif #ifdef SYNC_SER_MANUAL +static void send_word(struct sync_port *port); static irqreturn_t manual_interrupt(int irq, void *dev_id); #endif -#ifdef CONFIG_ETRAXFS /* ETRAX FS */ -#define OUT_DMA_NBR 4 -#define IN_DMA_NBR 5 -#define PINMUX_SSER pinmux_sser0 -#define SYNCSER_INST regi_sser0 -#define SYNCSER_INTR_VECT SSER0_INTR_VECT -#define OUT_DMA_INST regi_dma4 -#define IN_DMA_INST regi_dma5 -#define DMA_OUT_INTR_VECT DMA4_INTR_VECT -#define DMA_IN_INTR_VECT DMA5_INTR_VECT -#define REQ_DMA_SYNCSER dma_sser0 -#else /* Artpec-3 */ -#define OUT_DMA_NBR 6 -#define IN_DMA_NBR 7 -#define PINMUX_SSER pinmux_sser -#define SYNCSER_INST regi_sser -#define SYNCSER_INTR_VECT SSER_INTR_VECT -#define OUT_DMA_INST regi_dma6 -#define IN_DMA_INST regi_dma7 -#define DMA_OUT_INTR_VECT DMA6_INTR_VECT -#define DMA_IN_INTR_VECT DMA7_INTR_VECT -#define REQ_DMA_SYNCSER dma_sser +#define artpec_pinmux_alloc_fixed crisv32_pinmux_alloc_fixed +#define artpec_request_dma crisv32_request_dma +#define artpec_free_dma crisv32_free_dma + +#ifdef CONFIG_ETRAXFS +/* ETRAX FS */ +#define DMA_OUT_NBR0 SYNC_SER0_TX_DMA_NBR +#define DMA_IN_NBR0 SYNC_SER0_RX_DMA_NBR +#define DMA_OUT_NBR1 SYNC_SER1_TX_DMA_NBR +#define DMA_IN_NBR1 SYNC_SER1_RX_DMA_NBR +#define PINMUX_SSER0 pinmux_sser0 +#define PINMUX_SSER1 pinmux_sser1 +#define SYNCSER_INST0 regi_sser0 +#define SYNCSER_INST1 regi_sser1 +#define SYNCSER_INTR_VECT0 SSER0_INTR_VECT +#define SYNCSER_INTR_VECT1 SSER1_INTR_VECT +#define OUT_DMA_INST0 regi_dma4 +#define IN_DMA_INST0 regi_dma5 +#define DMA_OUT_INTR_VECT0 DMA4_INTR_VECT +#define DMA_OUT_INTR_VECT1 DMA7_INTR_VECT +#define DMA_IN_INTR_VECT0 DMA5_INTR_VECT +#define DMA_IN_INTR_VECT1 DMA6_INTR_VECT +#define REQ_DMA_SYNCSER0 dma_sser0 +#define REQ_DMA_SYNCSER1 dma_sser1 +#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) +#define PORT1_DMA 1 +#else +#define PORT1_DMA 0 +#endif +#elif defined(CONFIG_CRIS_MACH_ARTPEC3) +/* ARTPEC-3 */ +#define DMA_OUT_NBR0 SYNC_SER_TX_DMA_NBR +#define DMA_IN_NBR0 SYNC_SER_RX_DMA_NBR +#define PINMUX_SSER0 pinmux_sser +#define SYNCSER_INST0 regi_sser +#define SYNCSER_INTR_VECT0 SSER_INTR_VECT +#define OUT_DMA_INST0 regi_dma6 +#define IN_DMA_INST0 regi_dma7 +#define DMA_OUT_INTR_VECT0 DMA6_INTR_VECT +#define DMA_IN_INTR_VECT0 DMA7_INTR_VECT +#define REQ_DMA_SYNCSER0 dma_sser +#define REQ_DMA_SYNCSER1 dma_sser #endif -/* The ports */ -static struct sync_port ports[]= -{ - { - .regi_sser = SYNCSER_INST, - .regi_dmaout = OUT_DMA_INST, - .regi_dmain = IN_DMA_INST, #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) - .use_dma = 1, +#define PORT0_DMA 1 #else - .use_dma = 0, +#define PORT0_DMA 0 #endif - } -#ifdef CONFIG_ETRAXFS - , +/* The ports */ +static struct sync_port ports[] = { { - .regi_sser = regi_sser1, - .regi_dmaout = regi_dma6, - .regi_dmain = regi_dma7, -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) - .use_dma = 1, -#else - .use_dma = 0, -#endif - } + .regi_sser = SYNCSER_INST0, + .regi_dmaout = OUT_DMA_INST0, + .regi_dmain = IN_DMA_INST0, + .use_dma = PORT0_DMA, + .dma_in_intr_vect = DMA_IN_INTR_VECT0, + .dma_out_intr_vect = DMA_OUT_INTR_VECT0, + .dma_in_nbr = DMA_IN_NBR0, + .dma_out_nbr = DMA_OUT_NBR0, + .req_dma = REQ_DMA_SYNCSER0, + .syncser_intr_vect = SYNCSER_INTR_VECT0, + }, +#ifdef CONFIG_ETRAXFS + { + .regi_sser = SYNCSER_INST1, + .regi_dmaout = regi_dma6, + .regi_dmain = regi_dma7, + .use_dma = PORT1_DMA, + .dma_in_intr_vect = DMA_IN_INTR_VECT1, + .dma_out_intr_vect = DMA_OUT_INTR_VECT1, + .dma_in_nbr = DMA_IN_NBR1, + .dma_out_nbr = DMA_OUT_NBR1, + .req_dma = REQ_DMA_SYNCSER1, + .syncser_intr_vect = SYNCSER_INTR_VECT1, + }, #endif }; #define NBR_PORTS ARRAY_SIZE(ports) -static const struct file_operations sync_serial_fops = { +static const struct file_operations syncser_fops = { .owner = THIS_MODULE, .write = sync_serial_write, .read = sync_serial_read, @@ -253,61 +302,40 @@ static const struct file_operations sync_serial_fops = { .llseek = noop_llseek, }; -static int __init etrax_sync_serial_init(void) -{ - ports[0].enabled = 0; -#ifdef CONFIG_ETRAXFS - ports[1].enabled = 0; -#endif - if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial", - &sync_serial_fops) < 0) { - printk(KERN_WARNING - "Unable to get major for synchronous serial port\n"); - return -EBUSY; - } - - /* Initialize Ports */ -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) { - printk(KERN_WARNING - "Unable to alloc pins for synchronous serial port 0\n"); - return -EIO; - } - ports[0].enabled = 1; - initialize_port(0); -#endif - -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) - if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) { - printk(KERN_WARNING - "Unable to alloc pins for synchronous serial port 0\n"); - return -EIO; - } - ports[1].enabled = 1; - initialize_port(1); -#endif +static dev_t syncser_first; +static int minor_count = NBR_PORTS; +#define SYNCSER_NAME "syncser" +static struct cdev *syncser_cdev; +static struct class *syncser_class; -#ifdef CONFIG_ETRAXFS - printk(KERN_INFO "ETRAX FS synchronous serial port driver\n"); -#else - printk(KERN_INFO "Artpec-3 synchronous serial port driver\n"); -#endif - return 0; +static void sync_serial_start_port(struct sync_port *port) +{ + reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); + reg_sser_rw_tr_cfg tr_cfg = + REG_RD(sser, port->regi_sser, rw_tr_cfg); + reg_sser_rw_rec_cfg rec_cfg = + REG_RD(sser, port->regi_sser, rw_rec_cfg); + cfg.en = regk_sser_yes; + tr_cfg.tr_en = regk_sser_yes; + rec_cfg.rec_en = regk_sser_yes; + REG_WR(sser, port->regi_sser, rw_cfg, cfg); + REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); + REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); + port->started = 1; } static void __init initialize_port(int portnbr) { - int __attribute__((unused)) i; struct sync_port *port = &ports[portnbr]; - reg_sser_rw_cfg cfg = {0}; - reg_sser_rw_frm_cfg frm_cfg = {0}; - reg_sser_rw_tr_cfg tr_cfg = {0}; - reg_sser_rw_rec_cfg rec_cfg = {0}; + reg_sser_rw_cfg cfg = { 0 }; + reg_sser_rw_frm_cfg frm_cfg = { 0 }; + reg_sser_rw_tr_cfg tr_cfg = { 0 }; + reg_sser_rw_rec_cfg rec_cfg = { 0 }; - DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr)); + DEBUG(pr_info("Init sync serial port %d\n", portnbr)); port->port_nbr = portnbr; - port->init_irqs = 1; + port->init_irqs = no_irq_setup; port->out_rd_ptr = port->out_buffer; port->out_buf_count = 0; @@ -318,10 +346,11 @@ static void __init initialize_port(int portnbr) port->readp = port->flip; port->writep = port->flip; port->in_buffer_size = IN_BUFFER_SIZE; + port->in_buffer_len = 0; port->inbufchunk = IN_DESCR_SIZE; - port->next_rx_desc = &port->in_descr[0]; - port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1]; - port->prev_rx_desc->eol = 1; + + port->read_ts_idx = 0; + port->write_ts_idx = 0; init_waitqueue_head(&port->out_wait_q); init_waitqueue_head(&port->in_wait_q); @@ -368,14 +397,18 @@ static void __init initialize_port(int portnbr) REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); #ifdef SYNC_SER_DMA - /* Setup the descriptor ring for dma out/transmit. */ - for (i = 0; i < NBR_OUT_DESCR; i++) { - port->out_descr[i].wait = 0; - port->out_descr[i].intr = 1; - port->out_descr[i].eol = 0; - port->out_descr[i].out_eop = 0; - port->out_descr[i].next = - (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]); + { + int i; + /* Setup the descriptor ring for dma out/transmit. */ + for (i = 0; i < NBR_OUT_DESCR; i++) { + dma_descr_data *descr = &port->out_descr[i]; + descr->wait = 0; + descr->intr = 1; + descr->eol = 0; + descr->out_eop = 0; + descr->next = + (dma_descr_data *)virt_to_phys(&descr[i+1]); + } } /* Create a ring from the list. */ @@ -391,201 +424,116 @@ static void __init initialize_port(int portnbr) static inline int sync_data_avail(struct sync_port *port) { - int avail; - unsigned char *start; - unsigned char *end; - - start = (unsigned char*)port->readp; /* cast away volatile */ - end = (unsigned char*)port->writep; /* cast away volatile */ - /* 0123456789 0123456789 - * ----- - ----- - * ^rp ^wp ^wp ^rp - */ - - if (end >= start) - avail = end - start; - else - avail = port->in_buffer_size - (start - end); - return avail; -} - -static inline int sync_data_avail_to_end(struct sync_port *port) -{ - int avail; - unsigned char *start; - unsigned char *end; - - start = (unsigned char*)port->readp; /* cast away volatile */ - end = (unsigned char*)port->writep; /* cast away volatile */ - /* 0123456789 0123456789 - * ----- ----- - * ^rp ^wp ^wp ^rp - */ - - if (end >= start) - avail = end - start; - else - avail = port->flip + port->in_buffer_size - start; - return avail; + return port->in_buffer_len; } static int sync_serial_open(struct inode *inode, struct file *file) { + int ret = 0; int dev = iminor(inode); - int ret = -EBUSY; - sync_port *port; - reg_dma_rw_cfg cfg = {.en = regk_dma_yes}; - reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes}; + struct sync_port *port; +#ifdef SYNC_SER_DMA + reg_dma_rw_cfg cfg = { .en = regk_dma_yes }; + reg_dma_rw_intr_mask intr_mask = { .data = regk_dma_yes }; +#endif - mutex_lock(&sync_serial_mutex); - DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev)); + DEBUG(pr_debug("Open sync serial port %d\n", dev)); - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) - { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - ret = -ENODEV; - goto out; + if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { + DEBUG(pr_info("Invalid minor %d\n", dev)); + return -ENODEV; } port = &ports[dev]; /* Allow open this device twice (assuming one reader and one writer) */ - if (port->busy == 2) - { - DEBUG(printk(KERN_DEBUG "Device is busy.. \n")); - goto out; + if (port->busy == 2) { + DEBUG(pr_info("syncser%d is busy\n", dev)); + return -EBUSY; } + mutex_lock(&sync_serial_mutex); - if (port->init_irqs) { - if (port->use_dma) { - if (port == &ports[0]) { -#ifdef SYNC_SER_DMA - if (request_irq(DMA_OUT_INTR_VECT, - tr_interrupt, - 0, - "synchronous serial 0 dma tr", - &ports[0])) { - printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ"); - goto out; - } else if (request_irq(DMA_IN_INTR_VECT, - rx_interrupt, - 0, - "synchronous serial 1 dma rx", - &ports[0])) { - free_irq(DMA_OUT_INTR_VECT, &port[0]); - printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ"); - goto out; - } else if (crisv32_request_dma(OUT_DMA_NBR, - "synchronous serial 0 dma tr", - DMA_VERBOSE_ON_ERROR, - 0, - REQ_DMA_SYNCSER)) { - free_irq(DMA_OUT_INTR_VECT, &port[0]); - free_irq(DMA_IN_INTR_VECT, &port[0]); - printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel"); - goto out; - } else if (crisv32_request_dma(IN_DMA_NBR, - "synchronous serial 0 dma rec", - DMA_VERBOSE_ON_ERROR, - 0, - REQ_DMA_SYNCSER)) { - crisv32_free_dma(OUT_DMA_NBR); - free_irq(DMA_OUT_INTR_VECT, &port[0]); - free_irq(DMA_IN_INTR_VECT, &port[0]); - printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel"); - goto out; - } -#endif - } -#ifdef CONFIG_ETRAXFS - else if (port == &ports[1]) { + /* Clear any stale date left in the flip buffer */ + port->readp = port->writep = port->flip; + port->in_buffer_len = 0; + port->read_ts_idx = 0; + port->write_ts_idx = 0; + + if (port->init_irqs != no_irq_setup) { + /* Init only on first call. */ + port->busy++; + mutex_unlock(&sync_serial_mutex); + return 0; + } + if (port->use_dma) { #ifdef SYNC_SER_DMA - if (request_irq(DMA6_INTR_VECT, - tr_interrupt, - 0, - "synchronous serial 1 dma tr", - &ports[1])) { - printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ"); - goto out; - } else if (request_irq(DMA7_INTR_VECT, - rx_interrupt, - 0, - "synchronous serial 1 dma rx", - &ports[1])) { - free_irq(DMA6_INTR_VECT, &ports[1]); - printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ"); - goto out; - } else if (crisv32_request_dma( - SYNC_SER1_TX_DMA_NBR, - "synchronous serial 1 dma tr", - DMA_VERBOSE_ON_ERROR, - 0, - dma_sser1)) { - free_irq(DMA6_INTR_VECT, &ports[1]); - free_irq(DMA7_INTR_VECT, &ports[1]); - printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel"); - goto out; - } else if (crisv32_request_dma( - SYNC_SER1_RX_DMA_NBR, - "synchronous serial 3 dma rec", - DMA_VERBOSE_ON_ERROR, - 0, - dma_sser1)) { - crisv32_free_dma(SYNC_SER1_TX_DMA_NBR); - free_irq(DMA6_INTR_VECT, &ports[1]); - free_irq(DMA7_INTR_VECT, &ports[1]); - printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel"); - goto out; - } -#endif - } + const char *tmp; + DEBUG(pr_info("Using DMA for syncser%d\n", dev)); + + tmp = dev == 0 ? "syncser0 tx" : "syncser1 tx"; + if (request_irq(port->dma_out_intr_vect, tr_interrupt, 0, + tmp, port)) { + pr_err("Can't alloc syncser%d TX IRQ", dev); + ret = -EBUSY; + goto unlock_and_exit; + } + if (artpec_request_dma(port->dma_out_nbr, tmp, + DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { + free_irq(port->dma_out_intr_vect, port); + pr_err("Can't alloc syncser%d TX DMA", dev); + ret = -EBUSY; + goto unlock_and_exit; + } + tmp = dev == 0 ? "syncser0 rx" : "syncser1 rx"; + if (request_irq(port->dma_in_intr_vect, rx_interrupt, 0, + tmp, port)) { + artpec_free_dma(port->dma_out_nbr); + free_irq(port->dma_out_intr_vect, port); + pr_err("Can't alloc syncser%d RX IRQ", dev); + ret = -EBUSY; + goto unlock_and_exit; + } + if (artpec_request_dma(port->dma_in_nbr, tmp, + DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { + artpec_free_dma(port->dma_out_nbr); + free_irq(port->dma_out_intr_vect, port); + free_irq(port->dma_in_intr_vect, port); + pr_err("Can't alloc syncser%d RX DMA", dev); + ret = -EBUSY; + goto unlock_and_exit; + } + /* Enable DMAs */ + REG_WR(dma, port->regi_dmain, rw_cfg, cfg); + REG_WR(dma, port->regi_dmaout, rw_cfg, cfg); + /* Enable DMA IRQs */ + REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask); + REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask); + /* Set up wordsize = 1 for DMAs. */ + DMA_WR_CMD(port->regi_dmain, regk_dma_set_w_size1); + DMA_WR_CMD(port->regi_dmaout, regk_dma_set_w_size1); + + start_dma_in(port); + port->init_irqs = dma_irq_setup; #endif - /* Enable DMAs */ - REG_WR(dma, port->regi_dmain, rw_cfg, cfg); - REG_WR(dma, port->regi_dmaout, rw_cfg, cfg); - /* Enable DMA IRQs */ - REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask); - REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask); - /* Set up wordsize = 1 for DMAs. */ - DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1); - DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1); - - start_dma_in(port); - port->init_irqs = 0; - } else { /* !port->use_dma */ + } else { /* !port->use_dma */ #ifdef SYNC_SER_MANUAL - if (port == &ports[0]) { - if (request_irq(SYNCSER_INTR_VECT, - manual_interrupt, - 0, - "synchronous serial manual irq", - &ports[0])) { - printk("Can't allocate sync serial manual irq"); - goto out; - } - } -#ifdef CONFIG_ETRAXFS - else if (port == &ports[1]) { - if (request_irq(SSER1_INTR_VECT, - manual_interrupt, - 0, - "synchronous serial manual irq", - &ports[1])) { - printk(KERN_CRIT "Can't allocate sync serial manual irq"); - goto out; - } - } -#endif - port->init_irqs = 0; + const char *tmp = dev == 0 ? "syncser0 manual irq" : + "syncser1 manual irq"; + if (request_irq(port->syncser_intr_vect, manual_interrupt, + 0, tmp, port)) { + pr_err("Can't alloc syncser%d manual irq", + dev); + ret = -EBUSY; + goto unlock_and_exit; + } + port->init_irqs = manual_irq_setup; #else - panic("sync_serial: Manual mode not supported.\n"); + panic("sync_serial: Manual mode not supported\n"); #endif /* SYNC_SER_MANUAL */ - } - - } /* port->init_irqs */ - + } port->busy++; ret = 0; -out: + +unlock_and_exit: mutex_unlock(&sync_serial_mutex); return ret; } @@ -593,18 +541,17 @@ out: static int sync_serial_release(struct inode *inode, struct file *file) { int dev = iminor(inode); - sync_port *port; + struct sync_port *port; - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) - { - DEBUG(printk("Invalid minor %d\n", dev)); + if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { + DEBUG(pr_info("Invalid minor %d\n", dev)); return -ENODEV; } port = &ports[dev]; if (port->busy) port->busy--; if (!port->busy) - /* XXX */ ; + /* XXX */; return 0; } @@ -612,21 +559,15 @@ static unsigned int sync_serial_poll(struct file *file, poll_table *wait) { int dev = iminor(file_inode(file)); unsigned int mask = 0; - sync_port *port; - DEBUGPOLL( static unsigned int prev_mask = 0; ); + struct sync_port *port; + DEBUGPOLL( + static unsigned int prev_mask; + ); port = &ports[dev]; - if (!port->started) { - reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); - reg_sser_rw_rec_cfg rec_cfg = - REG_RD(sser, port->regi_sser, rw_rec_cfg); - cfg.en = regk_sser_yes; - rec_cfg.rec_en = port->input; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - port->started = 1; - } + if (!port->started) + sync_serial_start_port(port); poll_wait(file, &port->out_wait_q, wait); poll_wait(file, &port->in_wait_q, wait); @@ -645,33 +586,175 @@ static unsigned int sync_serial_poll(struct file *file, poll_table *wait) if (port->input && sync_data_avail(port) >= port->inbufchunk) mask |= POLLIN | POLLRDNORM; - DEBUGPOLL(if (mask != prev_mask) - printk("sync_serial_poll: mask 0x%08X %s %s\n", mask, - mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":""); - prev_mask = mask; - ); + DEBUGPOLL( + if (mask != prev_mask) + pr_info("sync_serial_poll: mask 0x%08X %s %s\n", + mask, + mask & POLLOUT ? "POLLOUT" : "", + mask & POLLIN ? "POLLIN" : ""); + prev_mask = mask; + ); return mask; } -static int sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) +static ssize_t __sync_serial_read(struct file *file, + char __user *buf, + size_t count, + loff_t *ppos, + struct timespec *ts) +{ + unsigned long flags; + int dev = MINOR(file->f_dentry->d_inode->i_rdev); + int avail; + struct sync_port *port; + unsigned char *start; + unsigned char *end; + + if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { + DEBUG(pr_info("Invalid minor %d\n", dev)); + return -ENODEV; + } + port = &ports[dev]; + + if (!port->started) + sync_serial_start_port(port); + + /* Calculate number of available bytes */ + /* Save pointers to avoid that they are modified by interrupt */ + spin_lock_irqsave(&port->lock, flags); + start = port->readp; + end = port->writep; + spin_unlock_irqrestore(&port->lock, flags); + + while ((start == end) && !port->in_buffer_len) { + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + + wait_event_interruptible(port->in_wait_q, + !(start == end && !port->full)); + + if (signal_pending(current)) + return -EINTR; + + spin_lock_irqsave(&port->lock, flags); + start = port->readp; + end = port->writep; + spin_unlock_irqrestore(&port->lock, flags); + } + + DEBUGREAD(pr_info("R%d c %d ri %u wi %u /%u\n", + dev, count, + start - port->flip, end - port->flip, + port->in_buffer_size)); + + /* Lazy read, never return wrapped data. */ + if (end > start) + avail = end - start; + else + avail = port->flip + port->in_buffer_size - start; + + count = count > avail ? avail : count; + if (copy_to_user(buf, start, count)) + return -EFAULT; + + /* If timestamp requested, find timestamp of first returned byte + * and copy it. + * N.B: Applications that request timstamps MUST read data in + * chunks that are multiples of IN_DESCR_SIZE. + * Otherwise the timestamps will not be aligned to the data read. + */ + if (ts != NULL) { + int idx = port->read_ts_idx; + memcpy(ts, &port->timestamp[idx], sizeof(struct timespec)); + port->read_ts_idx += count / IN_DESCR_SIZE; + if (port->read_ts_idx >= NBR_IN_DESCR) + port->read_ts_idx = 0; + } + + spin_lock_irqsave(&port->lock, flags); + port->readp += count; + /* Check for wrap */ + if (port->readp >= port->flip + port->in_buffer_size) + port->readp = port->flip; + port->in_buffer_len -= count; + port->full = 0; + spin_unlock_irqrestore(&port->lock, flags); + + DEBUGREAD(pr_info("r %d\n", count)); + + return count; +} + +static ssize_t sync_serial_input(struct file *file, unsigned long arg) +{ + struct ssp_request req; + int count; + int ret; + + /* Copy the request structure from user-mode. */ + ret = copy_from_user(&req, (struct ssp_request __user *)arg, + sizeof(struct ssp_request)); + + if (ret) { + DEBUG(pr_info("sync_serial_input copy from user failed\n")); + return -EFAULT; + } + + /* To get the timestamps aligned, make sure that 'len' + * is a multiple of IN_DESCR_SIZE. + */ + if ((req.len % IN_DESCR_SIZE) != 0) { + DEBUG(pr_info("sync_serial: req.len %x, IN_DESCR_SIZE %x\n", + req.len, IN_DESCR_SIZE)); + return -EFAULT; + } + + /* Do the actual read. */ + /* Note that req.buf is actually a pointer to user space. */ + count = __sync_serial_read(file, req.buf, req.len, + NULL, &req.ts); + + if (count < 0) { + DEBUG(pr_info("sync_serial_input read failed\n")); + return count; + } + + /* Copy the request back to user-mode. */ + ret = copy_to_user((struct ssp_request __user *)arg, &req, + sizeof(struct ssp_request)); + + if (ret) { + DEBUG(pr_info("syncser input copy2user failed\n")); + return -EFAULT; + } + + /* Return the number of bytes read. */ + return count; +} + + +static int sync_serial_ioctl_unlocked(struct file *file, + unsigned int cmd, unsigned long arg) { int return_val = 0; int dma_w_size = regk_dma_set_w_size1; int dev = iminor(file_inode(file)); - sync_port *port; + struct sync_port *port; reg_sser_rw_tr_cfg tr_cfg; reg_sser_rw_rec_cfg rec_cfg; reg_sser_rw_frm_cfg frm_cfg; reg_sser_rw_cfg gen_cfg; reg_sser_rw_intr_mask intr_mask; - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) - { - DEBUG(printk("Invalid minor %d\n", dev)); + if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { + DEBUG(pr_info("Invalid minor %d\n", dev)); return -1; } - port = &ports[dev]; + + if (cmd == SSP_INPUT) + return sync_serial_input(file, arg); + + port = &ports[dev]; spin_lock_irq(&port->lock); tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); @@ -680,11 +763,9 @@ static int sync_serial_ioctl(struct file *file, gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg); intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); - switch(cmd) - { + switch (cmd) { case SSP_SPEED: - if (GET_SPEED(arg) == CODEC) - { + if (GET_SPEED(arg) == CODEC) { unsigned int freq; gen_cfg.base_freq = regk_sser_f32; @@ -701,15 +782,25 @@ static int sync_serial_ioctl(struct file *file, case FREQ_256kHz: gen_cfg.clk_div = 125 * (1 << (freq - FREQ_256kHz)) - 1; - break; + break; case FREQ_512kHz: gen_cfg.clk_div = 62; - break; + break; case FREQ_1MHz: case FREQ_2MHz: case FREQ_4MHz: gen_cfg.clk_div = 8 * (1 << freq) - 1; - break; + break; + } + } else if (GET_SPEED(arg) == CODEC_f32768) { + gen_cfg.base_freq = regk_sser_f32_768; + switch (GET_FREQ(arg)) { + case FREQ_4096kHz: + gen_cfg.clk_div = 7; + break; + default: + spin_unlock_irq(&port->lock); + return -EINVAL; } } else { gen_cfg.base_freq = regk_sser_f29_493; @@ -767,62 +858,64 @@ static int sync_serial_ioctl(struct file *file, break; case SSP_MODE: - switch(arg) - { - case MASTER_OUTPUT: - port->output = 1; - port->input = 0; - frm_cfg.out_on = regk_sser_tr; - frm_cfg.frame_pin_dir = regk_sser_out; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_OUTPUT: - port->output = 1; - port->input = 0; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - case MASTER_INPUT: - port->output = 0; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.out_on = regk_sser_intern_tb; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_INPUT: - port->output = 0; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - case MASTER_BIDIR: - port->output = 1; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.out_on = regk_sser_intern_tb; - gen_cfg.clk_dir = regk_sser_out; - break; - case SLAVE_BIDIR: - port->output = 1; - port->input = 1; - frm_cfg.frame_pin_dir = regk_sser_in; - gen_cfg.clk_dir = regk_sser_in; - break; - default: - spin_unlock_irq(&port->lock); - return -EINVAL; + switch (arg) { + case MASTER_OUTPUT: + port->output = 1; + port->input = 0; + frm_cfg.out_on = regk_sser_tr; + frm_cfg.frame_pin_dir = regk_sser_out; + gen_cfg.clk_dir = regk_sser_out; + break; + case SLAVE_OUTPUT: + port->output = 1; + port->input = 0; + frm_cfg.frame_pin_dir = regk_sser_in; + gen_cfg.clk_dir = regk_sser_in; + break; + case MASTER_INPUT: + port->output = 0; + port->input = 1; + frm_cfg.frame_pin_dir = regk_sser_out; + frm_cfg.out_on = regk_sser_intern_tb; + gen_cfg.clk_dir = regk_sser_out; + break; + case SLAVE_INPUT: + port->output = 0; + port->input = 1; + frm_cfg.frame_pin_dir = regk_sser_in; + gen_cfg.clk_dir = regk_sser_in; + break; + case MASTER_BIDIR: + port->output = 1; + port->input = 1; + frm_cfg.frame_pin_dir = regk_sser_out; + frm_cfg.out_on = regk_sser_intern_tb; + gen_cfg.clk_dir = regk_sser_out; + break; + case SLAVE_BIDIR: + port->output = 1; + port->input = 1; + frm_cfg.frame_pin_dir = regk_sser_in; + gen_cfg.clk_dir = regk_sser_in; + break; + default: + spin_unlock_irq(&port->lock); + return -EINVAL; } - if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT)) + if (!port->use_dma || arg == MASTER_OUTPUT || + arg == SLAVE_OUTPUT) intr_mask.rdav = regk_sser_yes; break; case SSP_FRAME_SYNC: if (arg & NORMAL_SYNC) { frm_cfg.rec_delay = 1; frm_cfg.tr_delay = 1; - } - else if (arg & EARLY_SYNC) + } else if (arg & EARLY_SYNC) frm_cfg.rec_delay = frm_cfg.tr_delay = 0; - else if (arg & SECOND_WORD_SYNC) { + else if (arg & LATE_SYNC) { + frm_cfg.tr_delay = 2; + frm_cfg.rec_delay = 2; + } else if (arg & SECOND_WORD_SYNC) { frm_cfg.rec_delay = 7; frm_cfg.tr_delay = 1; } @@ -914,15 +1007,12 @@ static int sync_serial_ioctl(struct file *file, frm_cfg.type = regk_sser_level; frm_cfg.tr_delay = 1; frm_cfg.level = regk_sser_neg_lo; - if (arg & SPI_SLAVE) - { + if (arg & SPI_SLAVE) { rec_cfg.clk_pol = regk_sser_neg; gen_cfg.clk_dir = regk_sser_in; port->input = 1; port->output = 0; - } - else - { + } else { gen_cfg.out_clk_pol = regk_sser_pos; port->input = 0; port->output = 1; @@ -965,19 +1055,19 @@ static int sync_serial_ioctl(struct file *file, } static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) + unsigned int cmd, unsigned long arg) { - long ret; + long ret; - mutex_lock(&sync_serial_mutex); - ret = sync_serial_ioctl_unlocked(file, cmd, arg); - mutex_unlock(&sync_serial_mutex); + mutex_lock(&sync_serial_mutex); + ret = sync_serial_ioctl_unlocked(file, cmd, arg); + mutex_unlock(&sync_serial_mutex); - return ret; + return ret; } /* NOTE: sync_serial_write does not support concurrency */ -static ssize_t sync_serial_write(struct file *file, const char *buf, +static ssize_t sync_serial_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { int dev = iminor(file_inode(file)); @@ -993,7 +1083,7 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, unsigned char *buf_stop_ptr; /* Last byte + 1 */ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(printk("Invalid minor %d\n", dev)); + DEBUG(pr_info("Invalid minor %d\n", dev)); return -ENODEV; } port = &ports[dev]; @@ -1006,9 +1096,9 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, * |_________|___________________|________________________| * ^ rd_ptr ^ wr_ptr */ - DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n", - port->port_nbr, count, port->active_tr_descr, - port->catch_tr_descr)); + DEBUGWRITE(pr_info("W d%d c %u a: %p c: %p\n", + port->port_nbr, count, port->active_tr_descr, + port->catch_tr_descr)); /* Read variables that may be updated by interrupts */ spin_lock_irqsave(&port->lock, flags); @@ -1020,7 +1110,7 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, if (port->tr_running && ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) || out_buf_count >= OUT_BUFFER_SIZE)) { - DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev)); + DEBUGWRITE(pr_info("sser%d full\n", dev)); return -EAGAIN; } @@ -1043,15 +1133,16 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, if (copy_from_user(wr_ptr, buf, trunc_count)) return -EFAULT; - DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n", - out_buf_count, trunc_count, - port->out_buf_count, port->out_buffer, - wr_ptr, buf_stop_ptr)); + DEBUGOUTBUF(pr_info("%-4d + %-4d = %-4d %p %p %p\n", + out_buf_count, trunc_count, + port->out_buf_count, port->out_buffer, + wr_ptr, buf_stop_ptr)); /* Make sure transmitter/receiver is running */ if (!port->started) { reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); - reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); + reg_sser_rw_rec_cfg rec_cfg = + REG_RD(sser, port->regi_sser, rw_rec_cfg); cfg.en = regk_sser_yes; rec_cfg.rec_en = port->input; REG_WR(sser, port->regi_sser, rw_cfg, cfg); @@ -1068,8 +1159,11 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, spin_lock_irqsave(&port->lock, flags); port->out_buf_count += trunc_count; if (port->use_dma) { +#ifdef SYNC_SER_DMA start_dma_out(port, wr_ptr, trunc_count); +#endif } else if (!port->tr_running) { +#ifdef SYNC_SER_MANUAL reg_sser_rw_intr_mask intr_mask; intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); /* Start sender by writing data */ @@ -1077,14 +1171,15 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, /* and enable transmitter ready IRQ */ intr_mask.trdy = 1; REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); +#endif } spin_unlock_irqrestore(&port->lock, flags); /* Exit if non blocking */ if (file->f_flags & O_NONBLOCK) { - DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n", - port->port_nbr, trunc_count, - REG_RD_INT(dma, port->regi_dmaout, r_intr))); + DEBUGWRITE(pr_info("w d%d c %u %08x\n", + port->port_nbr, trunc_count, + REG_RD_INT(dma, port->regi_dmaout, r_intr))); return trunc_count; } @@ -1094,105 +1189,32 @@ static ssize_t sync_serial_write(struct file *file, const char *buf, if (signal_pending(current)) return -EINTR; - DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", - port->port_nbr, trunc_count)); + DEBUGWRITE(pr_info("w d%d c %u\n", port->port_nbr, trunc_count)); return trunc_count; } -static ssize_t sync_serial_read(struct file * file, char * buf, +static ssize_t sync_serial_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - int dev = iminor(file_inode(file)); - int avail; - sync_port *port; - unsigned char* start; - unsigned char* end; - unsigned long flags; - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) - { - DEBUG(printk("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size)); - - if (!port->started) - { - reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); - reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); - cfg.en = regk_sser_yes; - tr_cfg.tr_en = regk_sser_yes; - rec_cfg.rec_en = regk_sser_yes; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - port->started = 1; - } - - /* Calculate number of available bytes */ - /* Save pointers to avoid that they are modified by interrupt */ - spin_lock_irqsave(&port->lock, flags); - start = (unsigned char*)port->readp; /* cast away volatile */ - end = (unsigned char*)port->writep; /* cast away volatile */ - spin_unlock_irqrestore(&port->lock, flags); - while ((start == end) && !port->full) /* No data */ - { - DEBUGREAD(printk(KERN_DEBUG "&")); - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; - - wait_event_interruptible(port->in_wait_q, - !(start == end && !port->full)); - if (signal_pending(current)) - return -EINTR; - - spin_lock_irqsave(&port->lock, flags); - start = (unsigned char*)port->readp; /* cast away volatile */ - end = (unsigned char*)port->writep; /* cast away volatile */ - spin_unlock_irqrestore(&port->lock, flags); - } - - /* Lazy read, never return wrapped data. */ - if (port->full) - avail = port->in_buffer_size; - else if (end > start) - avail = end - start; - else - avail = port->flip + port->in_buffer_size - start; - - count = count > avail ? avail : count; - if (copy_to_user(buf, start, count)) - return -EFAULT; - /* Disable interrupts while updating readp */ - spin_lock_irqsave(&port->lock, flags); - port->readp += count; - if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ - port->readp = port->flip; - port->full = 0; - spin_unlock_irqrestore(&port->lock, flags); - DEBUGREAD(printk("r %d\n", count)); - return count; + return __sync_serial_read(file, buf, count, ppos, NULL); } -static void send_word(sync_port* port) +#ifdef SYNC_SER_MANUAL +static void send_word(struct sync_port *port) { reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); reg_sser_rw_tr_data tr_data = {0}; - switch(tr_cfg.sample_size) + switch (tr_cfg.sample_size) { + case 8: + port->out_buf_count--; + tr_data.data = *port->out_rd_ptr++; + REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); + if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) + port->out_rd_ptr = port->out_buffer; + break; + case 12: { - case 8: - port->out_buf_count--; - tr_data.data = *port->out_rd_ptr++; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - case 12: - { int data = (*port->out_rd_ptr++) << 8; data |= *port->out_rd_ptr++; port->out_buf_count -= 2; @@ -1200,8 +1222,8 @@ static void send_word(sync_port* port) REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) port->out_rd_ptr = port->out_buffer; + break; } - break; case 16: port->out_buf_count -= 2; tr_data.data = *(unsigned short *)port->out_rd_ptr; @@ -1233,27 +1255,28 @@ static void send_word(sync_port* port) break; } } +#endif -static void start_dma_out(struct sync_port *port, - const char *data, int count) +#ifdef SYNC_SER_DMA +static void start_dma_out(struct sync_port *port, const char *data, int count) { - port->active_tr_descr->buf = (char *) virt_to_phys((char *) data); + port->active_tr_descr->buf = (char *)virt_to_phys((char *)data); port->active_tr_descr->after = port->active_tr_descr->buf + count; port->active_tr_descr->intr = 1; port->active_tr_descr->eol = 1; port->prev_tr_descr->eol = 0; - DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n", + DEBUGTRDMA(pr_info("Inserting eolr:%p eol@:%p\n", port->prev_tr_descr, port->active_tr_descr)); port->prev_tr_descr = port->active_tr_descr; - port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next); + port->active_tr_descr = phys_to_virt((int)port->active_tr_descr->next); if (!port->tr_running) { reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - port->out_context.next = 0; + port->out_context.next = NULL; port->out_context.saved_data = (dma_descr_data *)virt_to_phys(port->prev_tr_descr); port->out_context.saved_data_buf = port->prev_tr_descr->buf; @@ -1263,57 +1286,58 @@ static void start_dma_out(struct sync_port *port, tr_cfg.tr_en = regk_sser_yes; REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - DEBUGTRDMA(printk(KERN_DEBUG "dma s\n");); + DEBUGTRDMA(pr_info(KERN_INFO "dma s\n");); } else { DMA_CONTINUE_DATA(port->regi_dmaout); - DEBUGTRDMA(printk(KERN_DEBUG "dma c\n");); + DEBUGTRDMA(pr_info("dma c\n");); } port->tr_running = 1; } -static void start_dma_in(sync_port *port) +static void start_dma_in(struct sync_port *port) { int i; char *buf; + unsigned long flags; + spin_lock_irqsave(&port->lock, flags); port->writep = port->flip; + spin_unlock_irqrestore(&port->lock, flags); - if (port->writep > port->flip + port->in_buffer_size) { - panic("Offset too large in sync serial driver\n"); - return; - } - buf = (char*)virt_to_phys(port->in_buffer); + buf = (char *)virt_to_phys(port->in_buffer); for (i = 0; i < NBR_IN_DESCR; i++) { port->in_descr[i].buf = buf; port->in_descr[i].after = buf + port->inbufchunk; port->in_descr[i].intr = 1; - port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]); + port->in_descr[i].next = + (dma_descr_data *)virt_to_phys(&port->in_descr[i+1]); port->in_descr[i].buf = buf; buf += port->inbufchunk; } /* Link the last descriptor to the first */ - port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]); + port->in_descr[i-1].next = + (dma_descr_data *)virt_to_phys(&port->in_descr[0]); port->in_descr[i-1].eol = regk_sser_yes; port->next_rx_desc = &port->in_descr[0]; port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1]; - port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]); + port->in_context.saved_data = + (dma_descr_data *)virt_to_phys(&port->in_descr[0]); port->in_context.saved_data_buf = port->in_descr[0].buf; DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context)); } -#ifdef SYNC_SER_DMA static irqreturn_t tr_interrupt(int irq, void *dev_id) { reg_dma_r_masked_intr masked; - reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes}; + reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; reg_dma_rw_stat stat; int i; int found = 0; int stop_sser = 0; for (i = 0; i < NBR_PORTS; i++) { - sync_port *port = &ports[i]; - if (!port->enabled || !port->use_dma) + struct sync_port *port = &ports[i]; + if (!port->enabled || !port->use_dma) continue; /* IRQ active for the port? */ @@ -1338,19 +1362,20 @@ static irqreturn_t tr_interrupt(int irq, void *dev_id) int sent; sent = port->catch_tr_descr->after - port->catch_tr_descr->buf; - DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t" - "in descr %p (ac: %p)\n", - port->out_buf_count, sent, - port->out_buf_count - sent, - port->catch_tr_descr, - port->active_tr_descr);); + DEBUGTXINT(pr_info("%-4d - %-4d = %-4d\t" + "in descr %p (ac: %p)\n", + port->out_buf_count, sent, + port->out_buf_count - sent, + port->catch_tr_descr, + port->active_tr_descr);); port->out_buf_count -= sent; port->catch_tr_descr = phys_to_virt((int) port->catch_tr_descr->next); port->out_rd_ptr = phys_to_virt((int) port->catch_tr_descr->buf); } else { - int i, sent; + reg_sser_rw_tr_cfg tr_cfg; + int j, sent; /* EOL handler. * Note that if an EOL was encountered during the irq * locked section of sync_ser_write the DMA will be @@ -1358,11 +1383,11 @@ static irqreturn_t tr_interrupt(int irq, void *dev_id) * The remaining descriptors will be traversed by * the descriptor interrupts as usual. */ - i = 0; + j = 0; while (!port->catch_tr_descr->eol) { sent = port->catch_tr_descr->after - port->catch_tr_descr->buf; - DEBUGOUTBUF(printk(KERN_DEBUG + DEBUGOUTBUF(pr_info( "traversing descr %p -%d (%d)\n", port->catch_tr_descr, sent, @@ -1370,16 +1395,15 @@ static irqreturn_t tr_interrupt(int irq, void *dev_id) port->out_buf_count -= sent; port->catch_tr_descr = phys_to_virt( (int)port->catch_tr_descr->next); - i++; - if (i >= NBR_OUT_DESCR) { + j++; + if (j >= NBR_OUT_DESCR) { /* TODO: Reset and recover */ panic("sync_serial: missing eol"); } } sent = port->catch_tr_descr->after - port->catch_tr_descr->buf; - DEBUGOUTBUF(printk(KERN_DEBUG - "eol at descr %p -%d (%d)\n", + DEBUGOUTBUF(pr_info("eol at descr %p -%d (%d)\n", port->catch_tr_descr, sent, port->out_buf_count)); @@ -1394,15 +1418,13 @@ static irqreturn_t tr_interrupt(int irq, void *dev_id) OUT_BUFFER_SIZE) port->out_rd_ptr = port->out_buffer; - reg_sser_rw_tr_cfg tr_cfg = - REG_RD(sser, port->regi_sser, rw_tr_cfg); - DEBUGTXINT(printk(KERN_DEBUG + tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); + DEBUGTXINT(pr_info( "tr_int DMA stop %d, set catch @ %p\n", port->out_buf_count, port->active_tr_descr)); if (port->out_buf_count != 0) - printk(KERN_CRIT "sync_ser: buffer not " - "empty after eol.\n"); + pr_err("sync_ser: buf not empty after eol\n"); port->catch_tr_descr = port->active_tr_descr; port->tr_running = 0; tr_cfg.tr_en = regk_sser_no; @@ -1414,62 +1436,79 @@ static irqreturn_t tr_interrupt(int irq, void *dev_id) return IRQ_RETVAL(found); } /* tr_interrupt */ + +static inline void handle_rx_packet(struct sync_port *port) +{ + int idx; + reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; + unsigned long flags; + + DEBUGRXINT(pr_info(KERN_INFO "!")); + spin_lock_irqsave(&port->lock, flags); + + /* If we overrun the user experience is crap regardless if we + * drop new or old data. Its much easier to get it right when + * dropping new data so lets do that. + */ + if ((port->writep + port->inbufchunk <= + port->flip + port->in_buffer_size) && + (port->in_buffer_len + port->inbufchunk < IN_BUFFER_SIZE)) { + memcpy(port->writep, + phys_to_virt((unsigned)port->next_rx_desc->buf), + port->inbufchunk); + port->writep += port->inbufchunk; + if (port->writep >= port->flip + port->in_buffer_size) + port->writep = port->flip; + + /* Timestamp the new data chunk. */ + if (port->write_ts_idx == NBR_IN_DESCR) + port->write_ts_idx = 0; + idx = port->write_ts_idx++; + do_posix_clock_monotonic_gettime(&port->timestamp[idx]); + port->in_buffer_len += port->inbufchunk; + } + spin_unlock_irqrestore(&port->lock, flags); + + port->next_rx_desc->eol = 1; + port->prev_rx_desc->eol = 0; + /* Cache bug workaround */ + flush_dma_descr(port->prev_rx_desc, 0); + port->prev_rx_desc = port->next_rx_desc; + port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next); + /* Cache bug workaround */ + flush_dma_descr(port->prev_rx_desc, 1); + /* wake up the waiting process */ + wake_up_interruptible(&port->in_wait_q); + DMA_CONTINUE(port->regi_dmain); + REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr); + +} + static irqreturn_t rx_interrupt(int irq, void *dev_id) { reg_dma_r_masked_intr masked; - reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes}; int i; int found = 0; - for (i = 0; i < NBR_PORTS; i++) - { - sync_port *port = &ports[i]; + DEBUG(pr_info("rx_interrupt\n")); + + for (i = 0; i < NBR_PORTS; i++) { + struct sync_port *port = &ports[i]; - if (!port->enabled || !port->use_dma ) + if (!port->enabled || !port->use_dma) continue; masked = REG_RD(dma, port->regi_dmain, r_masked_intr); - if (masked.data) /* Descriptor interrupt */ - { - found = 1; - while (REG_RD(dma, port->regi_dmain, rw_data) != - virt_to_phys(port->next_rx_desc)) { - DEBUGRXINT(printk(KERN_DEBUG "!")); - if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) { - int first_size = port->flip + port->in_buffer_size - port->writep; - memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size); - memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size); - port->writep = port->flip + port->inbufchunk - first_size; - } else { - memcpy((char*)port->writep, - phys_to_virt((unsigned)port->next_rx_desc->buf), - port->inbufchunk); - port->writep += port->inbufchunk; - if (port->writep >= port->flip + port->in_buffer_size) - port->writep = port->flip; - } - if (port->writep == port->readp) - { - port->full = 1; - } - - port->next_rx_desc->eol = 1; - port->prev_rx_desc->eol = 0; - /* Cache bug workaround */ - flush_dma_descr(port->prev_rx_desc, 0); - port->prev_rx_desc = port->next_rx_desc; - port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next); - /* Cache bug workaround */ - flush_dma_descr(port->prev_rx_desc, 1); - /* wake up the waiting process */ - wake_up_interruptible(&port->in_wait_q); - DMA_CONTINUE(port->regi_dmain); - REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr); + if (!masked.data) + continue; - } - } + /* Descriptor interrupt */ + found = 1; + while (REG_RD(dma, port->regi_dmain, rw_data) != + virt_to_phys(port->next_rx_desc)) + handle_rx_packet(port); } return IRQ_RETVAL(found); } /* rx_interrupt */ @@ -1478,75 +1517,83 @@ static irqreturn_t rx_interrupt(int irq, void *dev_id) #ifdef SYNC_SER_MANUAL static irqreturn_t manual_interrupt(int irq, void *dev_id) { + unsigned long flags; int i; int found = 0; reg_sser_r_masked_intr masked; - for (i = 0; i < NBR_PORTS; i++) - { - sync_port *port = &ports[i]; + for (i = 0; i < NBR_PORTS; i++) { + struct sync_port *port = &ports[i]; if (!port->enabled || port->use_dma) - { continue; - } masked = REG_RD(sser, port->regi_sser, r_masked_intr); - if (masked.rdav) /* Data received? */ - { - reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); - reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data); + /* Data received? */ + if (masked.rdav) { + reg_sser_rw_rec_cfg rec_cfg = + REG_RD(sser, port->regi_sser, rw_rec_cfg); + reg_sser_r_rec_data data = REG_RD(sser, + port->regi_sser, r_rec_data); found = 1; /* Read data */ - switch(rec_cfg.sample_size) - { + spin_lock_irqsave(&port->lock, flags); + switch (rec_cfg.sample_size) { case 8: *port->writep++ = data.data & 0xff; break; case 12: *port->writep = (data.data & 0x0ff0) >> 4; *(port->writep + 1) = data.data & 0x0f; - port->writep+=2; + port->writep += 2; break; case 16: - *(unsigned short*)port->writep = data.data; - port->writep+=2; + *(unsigned short *)port->writep = data.data; + port->writep += 2; break; case 24: - *(unsigned int*)port->writep = data.data; - port->writep+=3; + *(unsigned int *)port->writep = data.data; + port->writep += 3; break; case 32: - *(unsigned int*)port->writep = data.data; - port->writep+=4; + *(unsigned int *)port->writep = data.data; + port->writep += 4; break; } - if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */ + /* Wrap? */ + if (port->writep >= port->flip + port->in_buffer_size) port->writep = port->flip; if (port->writep == port->readp) { - /* receive buffer overrun, discard oldest data - */ + /* Receive buf overrun, discard oldest data */ port->readp++; - if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ + /* Wrap? */ + if (port->readp >= port->flip + + port->in_buffer_size) port->readp = port->flip; } + spin_unlock_irqrestore(&port->lock, flags); if (sync_data_avail(port) >= port->inbufchunk) - wake_up_interruptible(&port->in_wait_q); /* Wake up application */ + /* Wake up application */ + wake_up_interruptible(&port->in_wait_q); } - if (masked.trdy) /* Transmitter ready? */ - { + /* Transmitter ready? */ + if (masked.trdy) { found = 1; - if (port->out_buf_count > 0) /* More data to send */ + /* More data to send */ + if (port->out_buf_count > 0) send_word(port); - else /* transmission finished */ - { + else { + /* Transmission finished */ reg_sser_rw_intr_mask intr_mask; - intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); + intr_mask = REG_RD(sser, port->regi_sser, + rw_intr_mask); intr_mask.trdy = 0; - REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); - wake_up_interruptible(&port->out_wait_q); /* Wake up application */ + REG_WR(sser, port->regi_sser, + rw_intr_mask, intr_mask); + /* Wake up application */ + wake_up_interruptible(&port->out_wait_q); } } } @@ -1554,4 +1601,109 @@ static irqreturn_t manual_interrupt(int irq, void *dev_id) } #endif +static int __init etrax_sync_serial_init(void) +{ +#if 1 + /* This code will be removed when we move to udev for all devices. */ + syncser_first = MKDEV(SYNC_SERIAL_MAJOR, 0); + if (register_chrdev_region(syncser_first, minor_count, SYNCSER_NAME)) { + pr_err("Failed to register major %d\n", SYNC_SERIAL_MAJOR); + return -1; + } +#else + /* Allocate dynamic major number. */ + if (alloc_chrdev_region(&syncser_first, 0, minor_count, SYNCSER_NAME)) { + pr_err("Failed to allocate character device region\n"); + return -1; + } +#endif + syncser_cdev = cdev_alloc(); + if (!syncser_cdev) { + pr_err("Failed to allocate cdev for syncser\n"); + unregister_chrdev_region(syncser_first, minor_count); + return -1; + } + cdev_init(syncser_cdev, &syncser_fops); + + /* Create a sysfs class for syncser */ + syncser_class = class_create(THIS_MODULE, "syncser_class"); + + /* Initialize Ports */ +#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) + if (artpec_pinmux_alloc_fixed(PINMUX_SSER0)) { + pr_warn("Unable to alloc pins for synchronous serial port 0\n"); + unregister_chrdev_region(syncser_first, minor_count); + return -EIO; + } + initialize_port(0); + ports[0].enabled = 1; + /* Register with sysfs so udev can pick it up. */ + device_create(syncser_class, NULL, syncser_first, NULL, + "%s%d", SYNCSER_NAME, 0); +#endif + +#if defined(CONFIG_ETRAXFS) && defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) + if (artpec_pinmux_alloc_fixed(PINMUX_SSER1)) { + pr_warn("Unable to alloc pins for synchronous serial port 1\n"); + unregister_chrdev_region(syncser_first, minor_count); + class_destroy(syncser_class); + return -EIO; + } + initialize_port(1); + ports[1].enabled = 1; + /* Register with sysfs so udev can pick it up. */ + device_create(syncser_class, NULL, syncser_first, NULL, + "%s%d", SYNCSER_NAME, 0); +#endif + + /* Add it to system */ + if (cdev_add(syncser_cdev, syncser_first, minor_count) < 0) { + pr_err("Failed to add syncser as char device\n"); + device_destroy(syncser_class, syncser_first); + class_destroy(syncser_class); + cdev_del(syncser_cdev); + unregister_chrdev_region(syncser_first, minor_count); + return -1; + } + + + pr_info("ARTPEC synchronous serial port (%s: %d, %d)\n", + SYNCSER_NAME, MAJOR(syncser_first), MINOR(syncser_first)); + + return 0; +} + +static void __exit etrax_sync_serial_exit(void) +{ + int i; + device_destroy(syncser_class, syncser_first); + class_destroy(syncser_class); + + if (syncser_cdev) { + cdev_del(syncser_cdev); + unregister_chrdev_region(syncser_first, minor_count); + } + for (i = 0; i < NBR_PORTS; i++) { + struct sync_port *port = &ports[i]; + if (port->init_irqs == dma_irq_setup) { + /* Free dma irqs and dma channels. */ +#ifdef SYNC_SER_DMA + artpec_free_dma(port->dma_in_nbr); + artpec_free_dma(port->dma_out_nbr); + free_irq(port->dma_out_intr_vect, port); + free_irq(port->dma_in_intr_vect, port); +#endif + } else if (port->init_irqs == manual_irq_setup) { + /* Free manual irq. */ + free_irq(port->syncser_intr_vect, port); + } + } + + pr_info("ARTPEC synchronous serial port unregistered\n"); +} + module_init(etrax_sync_serial_init); +module_exit(etrax_sync_serial_exit); + +MODULE_LICENSE("GPL"); + |