+++ /dev/null
-/*
- * Simple synchronous serial port driver for ETRAX FS and ARTPEC-3.
- *
- * Copyright (c) 2005, 2008 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/signal.h>
-#include <linux/mutex.h>
-#include <linux/interrupt.h>
-#include <linux/poll.h>
-#include <linux/fs.h>
-#include <linux/cdev.h>
-#include <linux/device.h>
-#include <linux/wait.h>
-
-#include <asm/io.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>
-#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 */
-
-/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
-/* words can be handled */
-#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 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 used.
- */
-#define DEBUG(x)
-#define DEBUGREAD(x)
-#define DEBUGWRITE(x)
-#define DEBUGPOLL(x)
-#define DEBUGRXINT(x)
-#define DEBUGTXINT(x)
-#define DEBUGTRDMA(x)
-#define DEBUGOUTBUF(x)
-
-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 */
- 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;
-
- enum syncser_irq_setup init_irqs;
- int output;
- int input;
-
- /* Next byte to be read by application */
- unsigned char *readp;
- /* Next byte to be written by etrax */
- unsigned char *writep;
-
- unsigned int in_buffer_size;
- unsigned int in_buffer_len;
- unsigned int inbufchunk;
- /* 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
- * 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_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;
-};
-
-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 __poll_t sync_serial_poll(struct file *filp, poll_table *wait);
-
-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 __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)))
-#define SYNC_SER_DMA
-#else
-#define SYNC_SER_MANUAL
-#endif
-
-#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
-#ifdef SYNC_SER_MANUAL
-static void send_word(struct sync_port *port);
-static irqreturn_t manual_interrupt(int irq, void *dev_id);
-#endif
-
-#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
-
-#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
-#define PORT0_DMA 1
-#else
-#define PORT0_DMA 0
-#endif
-
-/* The ports */
-static struct sync_port ports[] = {
- {
- .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 syncser_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 dev_t syncser_first;
-static int minor_count = NBR_PORTS;
-#define SYNCSER_NAME "syncser"
-static struct cdev *syncser_cdev;
-static struct class *syncser_class;
-
-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)
-{
- 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(pr_info("Init sync serial port %d\n", portnbr));
-
- port->port_nbr = portnbr;
- port->init_irqs = no_irq_setup;
-
- 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->in_buffer_len = 0;
- port->inbufchunk = IN_DESCR_SIZE;
-
- port->read_ts_idx = 0;
- port->write_ts_idx = 0;
-
- 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
- {
- 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. */
- 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)
-{
- return port->in_buffer_len;
-}
-
-static int sync_serial_open(struct inode *inode, struct file *file)
-{
- int ret = 0;
- int dev = iminor(inode);
- 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
-
- DEBUG(pr_debug("Open sync serial port %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];
- /* Allow open this device twice (assuming one reader and one writer) */
- if (port->busy == 2) {
- DEBUG(pr_info("syncser%d is busy\n", dev));
- return -EBUSY;
- }
-
- mutex_lock(&sync_serial_mutex);
-
- /* 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
- 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
- } else { /* !port->use_dma */
-#ifdef SYNC_SER_MANUAL
- 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");
-#endif /* SYNC_SER_MANUAL */
- }
- port->busy++;
- ret = 0;
-
-unlock_and_exit:
- mutex_unlock(&sync_serial_mutex);
- return ret;
-}
-
-static int sync_serial_release(struct inode *inode, struct file *file)
-{
- int dev = iminor(inode);
- struct sync_port *port;
-
- 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 */;
- return 0;
-}
-
-static __poll_t sync_serial_poll(struct file *file, poll_table *wait)
-{
- int dev = iminor(file_inode(file));
- __poll_t mask = 0;
- struct sync_port *port;
- DEBUGPOLL(
- static __poll_t prev_mask;
- );
-
- port = &ports[dev];
-
- if (!port->started)
- sync_serial_start_port(port);
-
- 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 |= EPOLLOUT | EPOLLWRNORM;
-
- /* Descriptor and buffer space available. */
- if (port->output &&
- port->active_tr_descr != port->catch_tr_descr &&
- port->out_buf_count < OUT_BUFFER_SIZE)
- mask |= EPOLLOUT | EPOLLWRNORM;
-
- /* At least an inbufchunk of data */
- if (port->input && sync_data_avail(port) >= port->inbufchunk)
- mask |= EPOLLIN | EPOLLRDNORM;
-
- DEBUGPOLL(
- if (mask != prev_mask)
- pr_info("sync_serial_poll: mask 0x%08X %s %s\n",
- mask,
- mask & EPOLLOUT ? "POLLOUT" : "",
- mask & EPOLLIN ? "POLLIN" : "");
- prev_mask = mask;
- );
- return mask;
-}
-
-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_inode(file)->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));
- 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(pr_info("Invalid minor %d\n", dev));
- return -1;
- }
-
- 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);
- 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 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;
- 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 & 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;
- }
-
- 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 __user *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(pr_info("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(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);
- 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(pr_info("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(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);
- 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) {
-#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 */
- send_word(port);
- /* 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(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;
- }
-
- schedule();
- remove_wait_queue(&port->out_wait_q, &wait);
-
- if (signal_pending(current))
- return -EINTR;
-
- 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 __user *buf,
- size_t count, loff_t *ppos)
-{
- return __sync_serial_read(file, buf, count, ppos, NULL);
-}
-
-#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) {
- 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;
- }
-}
-#endif
-
-#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->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(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);
-
- if (!port->tr_running) {
- reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
- rw_tr_cfg);
-
- 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;
-
- 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(pr_info("dma s\n"););
- } else {
- DMA_CONTINUE_DATA(port->regi_dmaout);
- DEBUGTRDMA(pr_info("dma c\n"););
- }
-
- port->tr_running = 1;
-}
-
-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);
-
- 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));
-}
-
-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++) {
- struct 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(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 {
- 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
- * restarted and the eol flag will be cleared.
- * The remaining descriptors will be traversed by
- * the descriptor interrupts as usual.
- */
- j = 0;
- while (!port->catch_tr_descr->eol) {
- sent = port->catch_tr_descr->after -
- port->catch_tr_descr->buf;
- DEBUGOUTBUF(pr_info(
- "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);
- 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(pr_info("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;
-
- 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)
- 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;
- 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 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("!"));
- 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++;
- ktime_get_ts(&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;
-
- int i;
- int found = 0;
-
- 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)
- continue;
-
- masked = REG_RD(dma, port->regi_dmain, r_masked_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 */
-#endif /* SYNC_SER_DMA */
-
-#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++) {
- struct sync_port *port = &ports[i];
-
- if (!port->enabled || port->use_dma)
- continue;
-
- masked = REG_RD(sser, port->regi_sser, r_masked_intr);
- /* 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 */
- 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;
- 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;
- }
-
- /* Wrap? */
- if (port->writep >= port->flip + port->in_buffer_size)
- port->writep = port->flip;
- if (port->writep == port->readp) {
- /* Receive buf overrun, discard oldest data */
- port->readp++;
- /* 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 application */
- wake_up_interruptible(&port->in_wait_q);
- }
-
- /* Transmitter ready? */
- if (masked.trdy) {
- found = 1;
- /* More data to send */
- if (port->out_buf_count > 0)
- 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 application */
- wake_up_interruptible(&port->out_wait_q);
- }
- }
- }
- return IRQ_RETVAL(found);
-}
-#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");
- if (IS_ERR(syncser_class)) {
- pr_err("Failed to create a sysfs class for syncser\n");
- unregister_chrdev_region(syncser_first, minor_count);
- cdev_del(syncser_cdev);
- return -1;
- }
-
- /* 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");
-
projects / linux-2.6-block.git / blobdiff