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-rw-r--r--kernel/arch/cris/arch-v32/drivers/sync_serial.c1709
1 files changed, 1709 insertions, 0 deletions
diff --git a/kernel/arch/cris/arch-v32/drivers/sync_serial.c b/kernel/arch/cris/arch-v32/drivers/sync_serial.c
new file mode 100644
index 000000000..4dda9bd6b
--- /dev/null
+++ b/kernel/arch/cris/arch-v32/drivers/sync_serial.c
@@ -0,0 +1,1709 @@
+/*
+ * 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.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 unsigned int 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 unsigned int sync_serial_poll(struct file *file, poll_table *wait)
+{
+ int dev = iminor(file_inode(file));
+ unsigned int mask = 0;
+ struct sync_port *port;
+ DEBUGPOLL(
+ static unsigned int 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 |= 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)
+ pr_info("sync_serial_poll: mask 0x%08X %s %s\n",
+ mask,
+ mask & POLLOUT ? "POLLOUT" : "",
+ mask & POLLIN ? "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++;
+ do_posix_clock_monotonic_gettime(&port->timestamp[idx]);
+ port->in_buffer_len += port->inbufchunk;
+ }
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ port->next_rx_desc->eol = 1;
+ port->prev_rx_desc->eol = 0;
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 0);
+ port->prev_rx_desc = port->next_rx_desc;
+ port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 1);
+ /* wake up the waiting process */
+ wake_up_interruptible(&port->in_wait_q);
+ DMA_CONTINUE(port->regi_dmain);
+ REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
+
+}
+
+static irqreturn_t rx_interrupt(int irq, void *dev_id)
+{
+ reg_dma_r_masked_intr masked;
+
+ 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");
+
+ /* 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");
+