diff options
Diffstat (limited to 'arch/cris/arch-v32/drivers/sync_serial.c')
| -rw-r--r-- | arch/cris/arch-v32/drivers/sync_serial.c | 1556 |
1 files changed, 0 insertions, 1556 deletions
diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c deleted file mode 100644 index 219f704e3221..000000000000 --- a/arch/cris/arch-v32/drivers/sync_serial.c +++ /dev/null @@ -1,1556 +0,0 @@ -/* - * Simple synchronous serial port driver for ETRAX FS and Artpec-3. - * - * Copyright (c) 2005 Axis Communications AB - * - * Author: Mikael Starvik - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/major.h> -#include <linux/sched.h> -#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 <asm/io.h> -#include <dma.h> -#include <pinmux.h> -#include <hwregs/reg_rdwr.h> -#include <hwregs/sser_defs.h> -#include <hwregs/dma_defs.h> -#include <hwregs/dma.h> -#include <hwregs/intr_vect_defs.h> -#include <hwregs/intr_vect.h> -#include <hwregs/reg_map.h> -#include <asm/sync_serial.h> - - -/* The receiver is a bit tricky because of the continuous stream of data.*/ -/* */ -/* Three DMA descriptors are linked together. Each DMA descriptor is */ -/* responsible for port->bufchunk of a common buffer. */ -/* */ -/* +---------------------------------------------+ */ -/* | +----------+ +----------+ +----------+ | */ -/* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ -/* +----------+ +----------+ +----------+ */ -/* | | | */ -/* v v v */ -/* +-------------------------------------+ */ -/* | BUFFER | */ -/* +-------------------------------------+ */ -/* |<- data_avail ->| */ -/* readp writep */ -/* */ -/* If the application keeps up the pace readp will be right after writep.*/ -/* If the application can't keep the pace we have to throw away data. */ -/* The idea is that readp should be ready with the data pointed out by */ -/* Descr[i] when the DMA has filled in Descr[i+1]. */ -/* Otherwise we will discard */ -/* 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 OUT_BUFFER_SIZE 1024*8 -#define NBR_OUT_DESCR 8 - -#define DEFAULT_FRAME_RATE 0 -#define DEFAULT_WORD_RATE 7 - -/* NOTE: Enabling some debug will likely cause overrun or underrun, - * especially if manual mode is use. - */ -#define DEBUG(x) -#define DEBUGREAD(x) -#define DEBUGWRITE(x) -#define DEBUGPOLL(x) -#define DEBUGRXINT(x) -#define DEBUGTXINT(x) -#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; - - char started; /* 1 if port has been started */ - char port_nbr; /* Port 0 or 1 */ - char busy; /* 1 if port is busy */ - - char enabled; /* 1 if port is enabled */ - char use_dma; /* 1 if port uses dma */ - char tr_running; - - char init_irqs; - int output; - int input; - - /* Next byte to be read by application */ - volatile unsigned char *volatile readp; - /* Next byte to be written by etrax */ - volatile unsigned char *volatile writep; - - unsigned int in_buffer_size; - 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; - - /* Pointer to the first available descriptor in the ring, - * unless active_tr_descr == catch_tr_descr and a dma - * transfer is active */ - struct dma_descr_data *active_tr_descr; - - /* Pointer to the first allocated descriptor in the ring */ - struct dma_descr_data *catch_tr_descr; - - /* Pointer to the descriptor with the current end-of-list */ - struct dma_descr_data *prev_tr_descr; - int full; - - /* Pointer to the first byte being read by DMA - * or current position in out_buffer if not using DMA. */ - unsigned char *out_rd_ptr; - - /* 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))); - 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 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, - size_t count, loff_t *ppos); -static ssize_t sync_serial_read(struct file *file, char *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)) -#define SYNC_SER_DMA -#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 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 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 -#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, -#else - .use_dma = 0, -#endif - } -#ifdef CONFIG_ETRAXFS - , - - { - .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 - } -#endif -}; - -#define NBR_PORTS ARRAY_SIZE(ports) - -static const struct file_operations sync_serial_fops = { - .owner = THIS_MODULE, - .write = sync_serial_write, - .read = sync_serial_read, - .poll = sync_serial_poll, - .unlocked_ioctl = sync_serial_ioctl, - .open = sync_serial_open, - .release = sync_serial_release, - .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 - -#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 __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}; - - DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr)); - - port->port_nbr = portnbr; - port->init_irqs = 1; - - port->out_rd_ptr = port->out_buffer; - port->out_buf_count = 0; - - port->output = 1; - port->input = 0; - - port->readp = port->flip; - port->writep = port->flip; - port->in_buffer_size = IN_BUFFER_SIZE; - 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; - - init_waitqueue_head(&port->out_wait_q); - init_waitqueue_head(&port->in_wait_q); - - spin_lock_init(&port->lock); - - cfg.out_clk_src = regk_sser_intern_clk; - cfg.out_clk_pol = regk_sser_pos; - cfg.clk_od_mode = regk_sser_no; - cfg.clk_dir = regk_sser_out; - cfg.gate_clk = regk_sser_no; - cfg.base_freq = regk_sser_f29_493; - cfg.clk_div = 256; - REG_WR(sser, port->regi_sser, rw_cfg, cfg); - - frm_cfg.wordrate = DEFAULT_WORD_RATE; - frm_cfg.type = regk_sser_edge; - frm_cfg.frame_pin_dir = regk_sser_out; - frm_cfg.frame_pin_use = regk_sser_frm; - frm_cfg.status_pin_dir = regk_sser_in; - frm_cfg.status_pin_use = regk_sser_hold; - frm_cfg.out_on = regk_sser_tr; - frm_cfg.tr_delay = 1; - REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); - - tr_cfg.urun_stop = regk_sser_no; - tr_cfg.sample_size = 7; - tr_cfg.sh_dir = regk_sser_msbfirst; - tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; -#if 0 - tr_cfg.rate_ctrl = regk_sser_bulk; - tr_cfg.data_pin_use = regk_sser_dout; -#else - tr_cfg.rate_ctrl = regk_sser_iso; - tr_cfg.data_pin_use = regk_sser_dout; -#endif - tr_cfg.bulk_wspace = 1; - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - - rec_cfg.sample_size = 7; - rec_cfg.sh_dir = regk_sser_msbfirst; - rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; - rec_cfg.fifo_thr = regk_sser_inf; - 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]); - } - - /* Create a ring from the list. */ - port->out_descr[NBR_OUT_DESCR-1].next = - (dma_descr_data *)virt_to_phys(&port->out_descr[0]); - - /* Setup context for traversing the ring. */ - port->active_tr_descr = &port->out_descr[0]; - port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1]; - port->catch_tr_descr = &port->out_descr[0]; -#endif -} - -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; -} - -static int sync_serial_open(struct inode *inode, struct file *file) -{ - 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}; - - mutex_lock(&sync_serial_mutex); - DEBUG(printk(KERN_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; - } - 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->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]) { -#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 - } -#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 */ -#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; -#else - panic("sync_serial: Manual mode not supported.\n"); -#endif /* SYNC_SER_MANUAL */ - } - - } /* port->init_irqs */ - - port->busy++; - ret = 0; -out: - mutex_unlock(&sync_serial_mutex); - return ret; -} - -static int sync_serial_release(struct inode *inode, struct file *file) -{ - int dev = iminor(inode); - sync_port *port; - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) - { - DEBUG(printk("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - if (port->busy) - port->busy--; - if (!port->busy) - /* XXX */ ; - return 0; -} - -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; ); - - 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; - } - - poll_wait(file, &port->out_wait_q, wait); - poll_wait(file, &port->in_wait_q, wait); - - /* No active transfer, descriptors are available */ - if (port->output && !port->tr_running) - mask |= POLLOUT | POLLWRNORM; - - /* Descriptor and buffer space available. */ - if (port->output && - port->active_tr_descr != port->catch_tr_descr && - port->out_buf_count < OUT_BUFFER_SIZE) - mask |= POLLOUT | POLLWRNORM; - - /* At least an inbufchunk of data */ - 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; - ); - return mask; -} - -static int sync_serial_ioctl(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; - 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)); - return -1; - } - port = &ports[dev]; - spin_lock_irq(&port->lock); - - tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); - rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); - frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg); - gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg); - intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); - - switch(cmd) - { - case SSP_SPEED: - if (GET_SPEED(arg) == CODEC) - { - unsigned int freq; - - gen_cfg.base_freq = regk_sser_f32; - - /* Clock divider will internally be - * gen_cfg.clk_div + 1. - */ - - freq = GET_FREQ(arg); - switch (freq) { - case FREQ_32kHz: - case FREQ_64kHz: - case FREQ_128kHz: - case FREQ_256kHz: - gen_cfg.clk_div = 125 * - (1 << (freq - FREQ_256kHz)) - 1; - break; - case FREQ_512kHz: - gen_cfg.clk_div = 62; - break; - case FREQ_1MHz: - case FREQ_2MHz: - case FREQ_4MHz: - gen_cfg.clk_div = 8 * (1 << freq) - 1; - break; - } - } else { - gen_cfg.base_freq = regk_sser_f29_493; - switch (GET_SPEED(arg)) { - case SSP150: - gen_cfg.clk_div = 29493000 / (150 * 8) - 1; - break; - case SSP300: - gen_cfg.clk_div = 29493000 / (300 * 8) - 1; - break; - case SSP600: - gen_cfg.clk_div = 29493000 / (600 * 8) - 1; - break; - case SSP1200: - gen_cfg.clk_div = 29493000 / (1200 * 8) - 1; - break; - case SSP2400: - gen_cfg.clk_div = 29493000 / (2400 * 8) - 1; - break; - case SSP4800: - gen_cfg.clk_div = 29493000 / (4800 * 8) - 1; - break; - case SSP9600: - gen_cfg.clk_div = 29493000 / (9600 * 8) - 1; - break; - case SSP19200: - gen_cfg.clk_div = 29493000 / (19200 * 8) - 1; - break; - case SSP28800: - gen_cfg.clk_div = 29493000 / (28800 * 8) - 1; - break; - case SSP57600: - gen_cfg.clk_div = 29493000 / (57600 * 8) - 1; - break; - case SSP115200: - gen_cfg.clk_div = 29493000 / (115200 * 8) - 1; - break; - case SSP230400: - gen_cfg.clk_div = 29493000 / (230400 * 8) - 1; - break; - case SSP460800: - gen_cfg.clk_div = 29493000 / (460800 * 8) - 1; - break; - case SSP921600: - gen_cfg.clk_div = 29493000 / (921600 * 8) - 1; - break; - case SSP3125000: - gen_cfg.base_freq = regk_sser_f100; - gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1; - break; - - } - } - frm_cfg.wordrate = GET_WORD_RATE(arg); - - 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; - } - 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) - frm_cfg.rec_delay = frm_cfg.tr_delay = 0; - else if (arg & SECOND_WORD_SYNC) { - frm_cfg.rec_delay = 7; - frm_cfg.tr_delay = 1; - } - - tr_cfg.bulk_wspace = frm_cfg.tr_delay; - frm_cfg.early_wend = regk_sser_yes; - if (arg & BIT_SYNC) - frm_cfg.type = regk_sser_edge; - else if (arg & WORD_SYNC) - frm_cfg.type = regk_sser_level; - else if (arg & EXTENDED_SYNC) - frm_cfg.early_wend = regk_sser_no; - - if (arg & SYNC_ON) - frm_cfg.frame_pin_use = regk_sser_frm; - else if (arg & SYNC_OFF) - frm_cfg.frame_pin_use = regk_sser_gio0; - - dma_w_size = regk_dma_set_w_size2; - if (arg & WORD_SIZE_8) { - rec_cfg.sample_size = tr_cfg.sample_size = 7; - dma_w_size = regk_dma_set_w_size1; - } else if (arg & WORD_SIZE_12) - rec_cfg.sample_size = tr_cfg.sample_size = 11; - else if (arg & WORD_SIZE_16) - rec_cfg.sample_size = tr_cfg.sample_size = 15; - else if (arg & WORD_SIZE_24) - rec_cfg.sample_size = tr_cfg.sample_size = 23; - else if (arg & WORD_SIZE_32) - rec_cfg.sample_size = tr_cfg.sample_size = 31; - - if (arg & BIT_ORDER_MSB) - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; - else if (arg & BIT_ORDER_LSB) - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst; - - if (arg & FLOW_CONTROL_ENABLE) { - frm_cfg.status_pin_use = regk_sser_frm; - rec_cfg.fifo_thr = regk_sser_thr16; - } else if (arg & FLOW_CONTROL_DISABLE) { - frm_cfg.status_pin_use = regk_sser_gio0; - rec_cfg.fifo_thr = regk_sser_inf; - } - - if (arg & CLOCK_NOT_GATED) - gen_cfg.gate_clk = regk_sser_no; - else if (arg & CLOCK_GATED) - gen_cfg.gate_clk = regk_sser_yes; - - break; - case SSP_IPOLARITY: - /* NOTE!! negedge is considered NORMAL */ - if (arg & CLOCK_NORMAL) - rec_cfg.clk_pol = regk_sser_neg; - else if (arg & CLOCK_INVERT) - rec_cfg.clk_pol = regk_sser_pos; - - if (arg & FRAME_NORMAL) - frm_cfg.level = regk_sser_pos_hi; - else if (arg & FRAME_INVERT) - frm_cfg.level = regk_sser_neg_lo; - - if (arg & STATUS_NORMAL) - gen_cfg.hold_pol = regk_sser_pos; - else if (arg & STATUS_INVERT) - gen_cfg.hold_pol = regk_sser_neg; - break; - case SSP_OPOLARITY: - if (arg & CLOCK_NORMAL) - gen_cfg.out_clk_pol = regk_sser_pos; - else if (arg & CLOCK_INVERT) - gen_cfg.out_clk_pol = regk_sser_neg; - - if (arg & FRAME_NORMAL) - frm_cfg.level = regk_sser_pos_hi; - else if (arg & FRAME_INVERT) - frm_cfg.level = regk_sser_neg_lo; - - if (arg & STATUS_NORMAL) - gen_cfg.hold_pol = regk_sser_pos; - else if (arg & STATUS_INVERT) - gen_cfg.hold_pol = regk_sser_neg; - break; - case SSP_SPI: - rec_cfg.fifo_thr = regk_sser_inf; - rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; - rec_cfg.sample_size = tr_cfg.sample_size = 7; - frm_cfg.frame_pin_use = regk_sser_frm; - frm_cfg.type = regk_sser_level; - frm_cfg.tr_delay = 1; - frm_cfg.level = regk_sser_neg_lo; - 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 - { - gen_cfg.out_clk_pol = regk_sser_pos; - port->input = 0; - port->output = 1; - gen_cfg.clk_dir = regk_sser_out; - } - break; - case SSP_INBUFCHUNK: - break; - default: - return_val = -1; - } - - - if (port->started) { - rec_cfg.rec_en = port->input; - gen_cfg.en = (port->output | port->input); - } - - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); - REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); - REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - - - if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 | - WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) { - int en = gen_cfg.en; - gen_cfg.en = 0; - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - /* ##### Should DMA be stoped before we change dma size? */ - DMA_WR_CMD(port->regi_dmain, dma_w_size); - DMA_WR_CMD(port->regi_dmaout, dma_w_size); - gen_cfg.en = en; - REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); - } - - spin_unlock_irq(&port->lock); - return return_val; -} - -static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - long ret; - - mutex_lock(&sync_serial_mutex); - ret = sync_serial_ioctl_unlocked(file, cmd, arg); - mutex_unlock(&sync_serial_mutex); - - return ret; -} - -/* NOTE: sync_serial_write does not support concurrency */ -static ssize_t sync_serial_write(struct file *file, const char *buf, - size_t count, loff_t *ppos) -{ - int dev = iminor(file_inode(file)); - DECLARE_WAITQUEUE(wait, current); - struct sync_port *port; - int trunc_count; - unsigned long flags; - int bytes_free; - int out_buf_count; - - unsigned char *rd_ptr; /* First allocated byte in the buffer */ - unsigned char *wr_ptr; /* First free byte in the buffer */ - unsigned char *buf_stop_ptr; /* Last byte + 1 */ - - if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { - DEBUG(printk("Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - /* |<- OUT_BUFFER_SIZE ->| - * |<- out_buf_count ->| - * |<- trunc_count ->| ...->| - * ______________________________________________________ - * | free | data | free | - * |_________|___________________|________________________| - * ^ 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)); - - /* Read variables that may be updated by interrupts */ - spin_lock_irqsave(&port->lock, flags); - rd_ptr = port->out_rd_ptr; - out_buf_count = port->out_buf_count; - spin_unlock_irqrestore(&port->lock, flags); - - /* Check if resources are available */ - 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)); - return -EAGAIN; - } - - buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE; - - /* Determine pointer to the first free byte, before copying. */ - wr_ptr = rd_ptr + out_buf_count; - if (wr_ptr >= buf_stop_ptr) - wr_ptr -= OUT_BUFFER_SIZE; - - /* If we wrap the ring buffer, let the user space program handle it by - * truncating the data. This could be more elegant, small buffer - * fragments may occur. - */ - bytes_free = OUT_BUFFER_SIZE - out_buf_count; - if (wr_ptr + bytes_free > buf_stop_ptr) - bytes_free = buf_stop_ptr - wr_ptr; - trunc_count = (count < bytes_free) ? count : bytes_free; - - 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)); - - /* 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); - 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; - } - - /* Setup wait if blocking */ - if (!(file->f_flags & O_NONBLOCK)) { - add_wait_queue(&port->out_wait_q, &wait); - set_current_state(TASK_INTERRUPTIBLE); - } - - spin_lock_irqsave(&port->lock, flags); - port->out_buf_count += trunc_count; - if (port->use_dma) { - start_dma_out(port, wr_ptr, trunc_count); - } else if (!port->tr_running) { - reg_sser_rw_intr_mask intr_mask; - intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); - /* Start sender by writing data */ - send_word(port); - /* and enable transmitter ready IRQ */ - intr_mask.trdy = 1; - REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); - } - 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))); - return trunc_count; - } - - schedule(); - set_current_state(TASK_RUNNING); - remove_wait_queue(&port->out_wait_q, &wait); - - if (signal_pending(current)) - return -EINTR; - - DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", - port->port_nbr, trunc_count)); - return trunc_count; -} - -static ssize_t sync_serial_read(struct file * file, char * 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; - - interruptible_sleep_on(&port->in_wait_q); - 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; -} - -static void send_word(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) - { - 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; - tr_data.data = data; - 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 16: - port->out_buf_count -= 2; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - case 24: - port->out_buf_count -= 3; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - 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 32: - port->out_buf_count -= 4; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - tr_data.data = *(unsigned short *)port->out_rd_ptr; - REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); - port->out_rd_ptr += 2; - if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) - port->out_rd_ptr = port->out_buffer; - break; - } -} - -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->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", - 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); - - 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.saved_data = - (dma_descr_data *)virt_to_phys(port->prev_tr_descr); - port->out_context.saved_data_buf = port->prev_tr_descr->buf; - - DMA_START_CONTEXT(port->regi_dmaout, - virt_to_phys((char *)&port->out_context)); - - 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");); - } else { - DMA_CONTINUE_DATA(port->regi_dmaout); - DEBUGTRDMA(printk(KERN_DEBUG "dma c\n");); - } - - port->tr_running = 1; -} - -static void start_dma_in(sync_port *port) -{ - int i; - char *buf; - port->writep = port->flip; - - 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); - 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].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].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_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_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) - continue; - - /* IRQ active for the port? */ - masked = REG_RD(dma, port->regi_dmaout, r_masked_intr); - if (!masked.data) - continue; - - found = 1; - - /* Check if we should stop the DMA transfer */ - stat = REG_RD(dma, port->regi_dmaout, rw_stat); - if (stat.list_state == regk_dma_data_at_eol) - stop_sser = 1; - - /* Clear IRQ */ - REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr); - - if (!stop_sser) { - /* The DMA has completed a descriptor, EOL was not - * encountered, so step relevant descriptor and - * datapointers forward. */ - 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);); - 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; - /* EOL handler. - * Note that if an EOL was encountered during the irq - * locked section of sync_ser_write the DMA will be - * restarted and the eol flag will be cleared. - * The remaining descriptors will be traversed by - * the descriptor interrupts as usual. - */ - i = 0; - while (!port->catch_tr_descr->eol) { - sent = port->catch_tr_descr->after - - port->catch_tr_descr->buf; - DEBUGOUTBUF(printk(KERN_DEBUG - "traversing descr %p -%d (%d)\n", - port->catch_tr_descr, - sent, - port->out_buf_count)); - port->out_buf_count -= sent; - port->catch_tr_descr = phys_to_virt( - (int)port->catch_tr_descr->next); - i++; - if (i >= 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", - port->catch_tr_descr, - sent, - port->out_buf_count)); - - port->out_buf_count -= sent; - - /* Update read pointer to first free byte, we - * may already be writing data there. */ - port->out_rd_ptr = - phys_to_virt((int) port->catch_tr_descr->after); - if (port->out_rd_ptr > port->out_buffer + - 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_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"); - port->catch_tr_descr = port->active_tr_descr; - port->tr_running = 0; - tr_cfg.tr_en = regk_sser_no; - REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); - } - /* wake up the waiting process */ - wake_up_interruptible(&port->out_wait_q); - } - return IRQ_RETVAL(found); -} /* tr_interrupt */ - -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]; - - 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); - - } - } - } - return IRQ_RETVAL(found); -} /* rx_interrupt */ -#endif /* SYNC_SER_DMA */ - -#ifdef SYNC_SER_MANUAL -static irqreturn_t manual_interrupt(int irq, void *dev_id) -{ - int i; - int found = 0; - reg_sser_r_masked_intr masked; - - for (i = 0; i < NBR_PORTS; i++) - { - 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); - found = 1; - /* Read data */ - 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; - break; - case 16: - *(unsigned short*)port->writep = data.data; - port->writep+=2; - break; - case 24: - *(unsigned int*)port->writep = data.data; - port->writep+=3; - break; - case 32: - *(unsigned int*)port->writep = data.data; - port->writep+=4; - break; - } - - if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */ - port->writep = port->flip; - if (port->writep == port->readp) { - /* receive buffer overrun, discard oldest data - */ - port->readp++; - if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ - port->readp = port->flip; - } - if (sync_data_avail(port) >= port->inbufchunk) - wake_up_interruptible(&port->in_wait_q); /* Wake up application */ - } - - if (masked.trdy) /* Transmitter ready? */ - { - found = 1; - if (port->out_buf_count > 0) /* More data to send */ - send_word(port); - else /* transmission finished */ - { - reg_sser_rw_intr_mask 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 */ - } - } - } - return IRQ_RETVAL(found); -} -#endif - -module_init(etrax_sync_serial_init); |