/*
- * Simple synchronous serial port driver for ETRAX FS and Artpec-3.
- *
- * Copyright (c) 2005 Axis Communications AB
+ * Simple synchronous serial port driver for ETRAX FS and ARTPEC-3.
*
+ * Copyright (c) 2005, 2008 Axis Communications AB
* Author: Mikael Starvik
*
*/
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
-#include <linux/init.h>
-#include <linux/timer.h>
-#include <linux/spinlock.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
#include <linux/wait.h>
#include <asm/io.h>
-#include <dma.h>
+#include <mach/dma.h>
#include <pinmux.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/sser_defs.h>
+#include <hwregs/timer_defs.h>
#include <hwregs/dma_defs.h>
#include <hwregs/dma.h>
#include <hwregs/intr_vect_defs.h>
/* the rest of the data pointed out by Descr1 and set readp to the start */
/* of Descr2 */
-#define SYNC_SERIAL_MAJOR 125
-
/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
/* words can be handled */
-#define IN_BUFFER_SIZE 12288
-#define IN_DESCR_SIZE 256
-#define NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
+#define IN_DESCR_SIZE SSP_INPUT_CHUNK_SIZE
+#define NBR_IN_DESCR (8*6)
+#define IN_BUFFER_SIZE (IN_DESCR_SIZE * NBR_IN_DESCR)
-#define OUT_BUFFER_SIZE 1024*8
#define NBR_OUT_DESCR 8
+#define OUT_BUFFER_SIZE (1024 * NBR_OUT_DESCR)
#define DEFAULT_FRAME_RATE 0
#define DEFAULT_WORD_RATE 7
+/* To be removed when we move to pure udev. */
+#define SYNC_SERIAL_MAJOR 125
+
/* NOTE: Enabling some debug will likely cause overrun or underrun,
- * especially if manual mode is use.
+ * especially if manual mode is used.
*/
#define DEBUG(x)
#define DEBUGREAD(x)
#define DEBUGTRDMA(x)
#define DEBUGOUTBUF(x)
-typedef struct sync_port
-{
- reg_scope_instances regi_sser;
- reg_scope_instances regi_dmain;
- reg_scope_instances regi_dmaout;
+enum syncser_irq_setup {
+ no_irq_setup = 0,
+ dma_irq_setup = 1,
+ manual_irq_setup = 2,
+};
+
+struct sync_port {
+ unsigned long regi_sser;
+ unsigned long regi_dmain;
+ unsigned long regi_dmaout;
+
+ /* Interrupt vectors. */
+ unsigned long dma_in_intr_vect; /* Used for DMA in. */
+ unsigned long dma_out_intr_vect; /* Used for DMA out. */
+ unsigned long syncser_intr_vect; /* Used when no DMA. */
+
+ /* DMA number for in and out. */
+ unsigned int dma_in_nbr;
+ unsigned int dma_out_nbr;
+
+ /* DMA owner. */
+ enum dma_owner req_dma;
char started; /* 1 if port has been started */
char port_nbr; /* Port 0 or 1 */
char use_dma; /* 1 if port uses dma */
char tr_running;
- char init_irqs;
+ enum syncser_irq_setup init_irqs;
int output;
int input;
/* Next byte to be read by application */
- volatile unsigned char *volatile readp;
+ unsigned char *readp;
/* Next byte to be written by etrax */
- volatile unsigned char *volatile writep;
+ unsigned char *writep;
unsigned int in_buffer_size;
+ unsigned int in_buffer_len;
unsigned int inbufchunk;
- unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
- unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
- unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
- struct dma_descr_data* next_rx_desc;
- struct dma_descr_data* prev_rx_desc;
+ /* Data buffers for in and output. */
+ unsigned char out_buffer[OUT_BUFFER_SIZE] __aligned(32);
+ unsigned char in_buffer[IN_BUFFER_SIZE] __aligned(32);
+ unsigned char flip[IN_BUFFER_SIZE] __aligned(32);
+ struct timespec timestamp[NBR_IN_DESCR];
+ struct dma_descr_data *next_rx_desc;
+ struct dma_descr_data *prev_rx_desc;
+
+ struct timeval last_timestamp;
+ int read_ts_idx;
+ int write_ts_idx;
/* Pointer to the first available descriptor in the ring,
* unless active_tr_descr == catch_tr_descr and a dma
/* Number of bytes currently locked for being read by DMA */
int out_buf_count;
- dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16)));
- dma_descr_context in_context __attribute__ ((__aligned__(32)));
- dma_descr_data out_descr[NBR_OUT_DESCR]
- __attribute__ ((__aligned__(16)));
- dma_descr_context out_context __attribute__ ((__aligned__(32)));
+ dma_descr_context in_context __aligned(32);
+ dma_descr_context out_context __aligned(32);
+ dma_descr_data in_descr[NBR_IN_DESCR] __aligned(16);
+ dma_descr_data out_descr[NBR_OUT_DESCR] __aligned(16);
+
wait_queue_head_t out_wait_q;
wait_queue_head_t in_wait_q;
spinlock_t lock;
-} sync_port;
+};
static DEFINE_MUTEX(sync_serial_mutex);
static int etrax_sync_serial_init(void);
static void initialize_port(int portnbr);
static inline int sync_data_avail(struct sync_port *port);
-static int sync_serial_open(struct inode *, struct file*);
-static int sync_serial_release(struct inode*, struct file*);
+static int sync_serial_open(struct inode *, struct file *);
+static int sync_serial_release(struct inode *, struct file *);
static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
-static int sync_serial_ioctl(struct file *,
- unsigned int cmd, unsigned long arg);
-static ssize_t sync_serial_write(struct file * file, const char * buf,
+static long sync_serial_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg);
+static int sync_serial_ioctl_unlocked(struct file *file,
+ unsigned int cmd, unsigned long arg);
+static ssize_t sync_serial_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos);
-static ssize_t sync_serial_read(struct file *file, char *buf,
+static ssize_t sync_serial_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos);
-#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
- defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
- (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
- defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
+#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
+ defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
+ (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
+ defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)))
#define SYNC_SER_DMA
+#else
+#define SYNC_SER_MANUAL
#endif
-static void send_word(sync_port* port);
-static void start_dma_out(struct sync_port *port, const char *data, int count);
-static void start_dma_in(sync_port* port);
#ifdef SYNC_SER_DMA
+static void start_dma_out(struct sync_port *port, const char *data, int count);
+static void start_dma_in(struct sync_port *port);
static irqreturn_t tr_interrupt(int irq, void *dev_id);
static irqreturn_t rx_interrupt(int irq, void *dev_id);
#endif
-
-#if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
- !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
- (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
- !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
-#define SYNC_SER_MANUAL
-#endif
#ifdef SYNC_SER_MANUAL
+static void send_word(struct sync_port *port);
static irqreturn_t manual_interrupt(int irq, void *dev_id);
#endif
-#ifdef CONFIG_ETRAXFS /* ETRAX FS */
-#define OUT_DMA_NBR 4
-#define IN_DMA_NBR 5
-#define PINMUX_SSER pinmux_sser0
-#define SYNCSER_INST regi_sser0
-#define SYNCSER_INTR_VECT SSER0_INTR_VECT
-#define OUT_DMA_INST regi_dma4
-#define IN_DMA_INST regi_dma5
-#define DMA_OUT_INTR_VECT DMA4_INTR_VECT
-#define DMA_IN_INTR_VECT DMA5_INTR_VECT
-#define REQ_DMA_SYNCSER dma_sser0
-#else /* Artpec-3 */
-#define OUT_DMA_NBR 6
-#define IN_DMA_NBR 7
-#define PINMUX_SSER pinmux_sser
-#define SYNCSER_INST regi_sser
-#define SYNCSER_INTR_VECT SSER_INTR_VECT
-#define OUT_DMA_INST regi_dma6
-#define IN_DMA_INST regi_dma7
-#define DMA_OUT_INTR_VECT DMA6_INTR_VECT
-#define DMA_IN_INTR_VECT DMA7_INTR_VECT
-#define REQ_DMA_SYNCSER dma_sser
+#define artpec_pinmux_alloc_fixed crisv32_pinmux_alloc_fixed
+#define artpec_request_dma crisv32_request_dma
+#define artpec_free_dma crisv32_free_dma
+
+#ifdef CONFIG_ETRAXFS
+/* ETRAX FS */
+#define DMA_OUT_NBR0 SYNC_SER0_TX_DMA_NBR
+#define DMA_IN_NBR0 SYNC_SER0_RX_DMA_NBR
+#define DMA_OUT_NBR1 SYNC_SER1_TX_DMA_NBR
+#define DMA_IN_NBR1 SYNC_SER1_RX_DMA_NBR
+#define PINMUX_SSER0 pinmux_sser0
+#define PINMUX_SSER1 pinmux_sser1
+#define SYNCSER_INST0 regi_sser0
+#define SYNCSER_INST1 regi_sser1
+#define SYNCSER_INTR_VECT0 SSER0_INTR_VECT
+#define SYNCSER_INTR_VECT1 SSER1_INTR_VECT
+#define OUT_DMA_INST0 regi_dma4
+#define IN_DMA_INST0 regi_dma5
+#define DMA_OUT_INTR_VECT0 DMA4_INTR_VECT
+#define DMA_OUT_INTR_VECT1 DMA7_INTR_VECT
+#define DMA_IN_INTR_VECT0 DMA5_INTR_VECT
+#define DMA_IN_INTR_VECT1 DMA6_INTR_VECT
+#define REQ_DMA_SYNCSER0 dma_sser0
+#define REQ_DMA_SYNCSER1 dma_sser1
+#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
+#define PORT1_DMA 1
+#else
+#define PORT1_DMA 0
+#endif
+#elif defined(CONFIG_CRIS_MACH_ARTPEC3)
+/* ARTPEC-3 */
+#define DMA_OUT_NBR0 SYNC_SER_TX_DMA_NBR
+#define DMA_IN_NBR0 SYNC_SER_RX_DMA_NBR
+#define PINMUX_SSER0 pinmux_sser
+#define SYNCSER_INST0 regi_sser
+#define SYNCSER_INTR_VECT0 SSER_INTR_VECT
+#define OUT_DMA_INST0 regi_dma6
+#define IN_DMA_INST0 regi_dma7
+#define DMA_OUT_INTR_VECT0 DMA6_INTR_VECT
+#define DMA_IN_INTR_VECT0 DMA7_INTR_VECT
+#define REQ_DMA_SYNCSER0 dma_sser
+#define REQ_DMA_SYNCSER1 dma_sser
#endif
-/* The ports */
-static struct sync_port ports[]=
-{
- {
- .regi_sser = SYNCSER_INST,
- .regi_dmaout = OUT_DMA_INST,
- .regi_dmain = IN_DMA_INST,
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
- .use_dma = 1,
+#define PORT0_DMA 1
#else
- .use_dma = 0,
+#define PORT0_DMA 0
#endif
- }
-#ifdef CONFIG_ETRAXFS
- ,
+/* The ports */
+static struct sync_port ports[] = {
{
- .regi_sser = regi_sser1,
- .regi_dmaout = regi_dma6,
- .regi_dmain = regi_dma7,
-#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
- .use_dma = 1,
-#else
- .use_dma = 0,
-#endif
- }
+ .regi_sser = SYNCSER_INST0,
+ .regi_dmaout = OUT_DMA_INST0,
+ .regi_dmain = IN_DMA_INST0,
+ .use_dma = PORT0_DMA,
+ .dma_in_intr_vect = DMA_IN_INTR_VECT0,
+ .dma_out_intr_vect = DMA_OUT_INTR_VECT0,
+ .dma_in_nbr = DMA_IN_NBR0,
+ .dma_out_nbr = DMA_OUT_NBR0,
+ .req_dma = REQ_DMA_SYNCSER0,
+ .syncser_intr_vect = SYNCSER_INTR_VECT0,
+ },
+#ifdef CONFIG_ETRAXFS
+ {
+ .regi_sser = SYNCSER_INST1,
+ .regi_dmaout = regi_dma6,
+ .regi_dmain = regi_dma7,
+ .use_dma = PORT1_DMA,
+ .dma_in_intr_vect = DMA_IN_INTR_VECT1,
+ .dma_out_intr_vect = DMA_OUT_INTR_VECT1,
+ .dma_in_nbr = DMA_IN_NBR1,
+ .dma_out_nbr = DMA_OUT_NBR1,
+ .req_dma = REQ_DMA_SYNCSER1,
+ .syncser_intr_vect = SYNCSER_INTR_VECT1,
+ },
#endif
};
#define NBR_PORTS ARRAY_SIZE(ports)
-static const struct file_operations sync_serial_fops = {
+static const struct file_operations syncser_fops = {
.owner = THIS_MODULE,
.write = sync_serial_write,
.read = sync_serial_read,
.llseek = noop_llseek,
};
-static int __init etrax_sync_serial_init(void)
-{
- ports[0].enabled = 0;
-#ifdef CONFIG_ETRAXFS
- ports[1].enabled = 0;
-#endif
- if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
- &sync_serial_fops) < 0) {
- printk(KERN_WARNING
- "Unable to get major for synchronous serial port\n");
- return -EBUSY;
- }
-
- /* Initialize Ports */
-#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
- if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) {
- printk(KERN_WARNING
- "Unable to alloc pins for synchronous serial port 0\n");
- return -EIO;
- }
- ports[0].enabled = 1;
- initialize_port(0);
-#endif
-
-#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
- if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) {
- printk(KERN_WARNING
- "Unable to alloc pins for synchronous serial port 0\n");
- return -EIO;
- }
- ports[1].enabled = 1;
- initialize_port(1);
-#endif
+static dev_t syncser_first;
+static int minor_count = NBR_PORTS;
+#define SYNCSER_NAME "syncser"
+static struct cdev *syncser_cdev;
+static struct class *syncser_class;
-#ifdef CONFIG_ETRAXFS
- printk(KERN_INFO "ETRAX FS synchronous serial port driver\n");
-#else
- printk(KERN_INFO "Artpec-3 synchronous serial port driver\n");
-#endif
- return 0;
+static void sync_serial_start_port(struct sync_port *port)
+{
+ reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
+ reg_sser_rw_tr_cfg tr_cfg =
+ REG_RD(sser, port->regi_sser, rw_tr_cfg);
+ reg_sser_rw_rec_cfg rec_cfg =
+ REG_RD(sser, port->regi_sser, rw_rec_cfg);
+ cfg.en = regk_sser_yes;
+ tr_cfg.tr_en = regk_sser_yes;
+ rec_cfg.rec_en = regk_sser_yes;
+ REG_WR(sser, port->regi_sser, rw_cfg, cfg);
+ REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
+ REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
+ port->started = 1;
}
static void __init initialize_port(int portnbr)
{
- int __attribute__((unused)) i;
struct sync_port *port = &ports[portnbr];
- reg_sser_rw_cfg cfg = {0};
- reg_sser_rw_frm_cfg frm_cfg = {0};
- reg_sser_rw_tr_cfg tr_cfg = {0};
- reg_sser_rw_rec_cfg rec_cfg = {0};
+ reg_sser_rw_cfg cfg = { 0 };
+ reg_sser_rw_frm_cfg frm_cfg = { 0 };
+ reg_sser_rw_tr_cfg tr_cfg = { 0 };
+ reg_sser_rw_rec_cfg rec_cfg = { 0 };
- DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
+ DEBUG(pr_info("Init sync serial port %d\n", portnbr));
port->port_nbr = portnbr;
- port->init_irqs = 1;
+ port->init_irqs = no_irq_setup;
port->out_rd_ptr = port->out_buffer;
port->out_buf_count = 0;
port->readp = port->flip;
port->writep = port->flip;
port->in_buffer_size = IN_BUFFER_SIZE;
+ port->in_buffer_len = 0;
port->inbufchunk = IN_DESCR_SIZE;
- port->next_rx_desc = &port->in_descr[0];
- port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1];
- port->prev_rx_desc->eol = 1;
+
+ port->read_ts_idx = 0;
+ port->write_ts_idx = 0;
init_waitqueue_head(&port->out_wait_q);
init_waitqueue_head(&port->in_wait_q);
REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
#ifdef SYNC_SER_DMA
- /* Setup the descriptor ring for dma out/transmit. */
- for (i = 0; i < NBR_OUT_DESCR; i++) {
- port->out_descr[i].wait = 0;
- port->out_descr[i].intr = 1;
- port->out_descr[i].eol = 0;
- port->out_descr[i].out_eop = 0;
- port->out_descr[i].next =
- (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]);
+ {
+ int i;
+ /* Setup the descriptor ring for dma out/transmit. */
+ for (i = 0; i < NBR_OUT_DESCR; i++) {
+ dma_descr_data *descr = &port->out_descr[i];
+ descr->wait = 0;
+ descr->intr = 1;
+ descr->eol = 0;
+ descr->out_eop = 0;
+ descr->next =
+ (dma_descr_data *)virt_to_phys(&descr[i+1]);
+ }
}
/* Create a ring from the list. */
static inline int sync_data_avail(struct sync_port *port)
{
- int avail;
- unsigned char *start;
- unsigned char *end;
-
- start = (unsigned char*)port->readp; /* cast away volatile */
- end = (unsigned char*)port->writep; /* cast away volatile */
- /* 0123456789 0123456789
- * ----- - -----
- * ^rp ^wp ^wp ^rp
- */
-
- if (end >= start)
- avail = end - start;
- else
- avail = port->in_buffer_size - (start - end);
- return avail;
-}
-
-static inline int sync_data_avail_to_end(struct sync_port *port)
-{
- int avail;
- unsigned char *start;
- unsigned char *end;
-
- start = (unsigned char*)port->readp; /* cast away volatile */
- end = (unsigned char*)port->writep; /* cast away volatile */
- /* 0123456789 0123456789
- * ----- -----
- * ^rp ^wp ^wp ^rp
- */
-
- if (end >= start)
- avail = end - start;
- else
- avail = port->flip + port->in_buffer_size - start;
- return avail;
+ return port->in_buffer_len;
}
static int sync_serial_open(struct inode *inode, struct file *file)
{
+ int ret = 0;
int dev = iminor(inode);
- int ret = -EBUSY;
- sync_port *port;
- reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
- reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
+ struct sync_port *port;
+#ifdef SYNC_SER_DMA
+ reg_dma_rw_cfg cfg = { .en = regk_dma_yes };
+ reg_dma_rw_intr_mask intr_mask = { .data = regk_dma_yes };
+#endif
- mutex_lock(&sync_serial_mutex);
- DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
+ DEBUG(pr_debug("Open sync serial port %d\n", dev));
- if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
- {
- DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
- ret = -ENODEV;
- goto out;
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
+ DEBUG(pr_info("Invalid minor %d\n", dev));
+ return -ENODEV;
}
port = &ports[dev];
/* Allow open this device twice (assuming one reader and one writer) */
- if (port->busy == 2)
- {
- DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
- goto out;
+ if (port->busy == 2) {
+ DEBUG(pr_info("syncser%d is busy\n", dev));
+ return -EBUSY;
}
+ mutex_lock(&sync_serial_mutex);
- if (port->init_irqs) {
- if (port->use_dma) {
- if (port == &ports[0]) {
-#ifdef SYNC_SER_DMA
- if (request_irq(DMA_OUT_INTR_VECT,
- tr_interrupt,
- 0,
- "synchronous serial 0 dma tr",
- &ports[0])) {
- printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
- goto out;
- } else if (request_irq(DMA_IN_INTR_VECT,
- rx_interrupt,
- 0,
- "synchronous serial 1 dma rx",
- &ports[0])) {
- free_irq(DMA_OUT_INTR_VECT, &port[0]);
- printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
- goto out;
- } else if (crisv32_request_dma(OUT_DMA_NBR,
- "synchronous serial 0 dma tr",
- DMA_VERBOSE_ON_ERROR,
- 0,
- REQ_DMA_SYNCSER)) {
- free_irq(DMA_OUT_INTR_VECT, &port[0]);
- free_irq(DMA_IN_INTR_VECT, &port[0]);
- printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
- goto out;
- } else if (crisv32_request_dma(IN_DMA_NBR,
- "synchronous serial 0 dma rec",
- DMA_VERBOSE_ON_ERROR,
- 0,
- REQ_DMA_SYNCSER)) {
- crisv32_free_dma(OUT_DMA_NBR);
- free_irq(DMA_OUT_INTR_VECT, &port[0]);
- free_irq(DMA_IN_INTR_VECT, &port[0]);
- printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
- goto out;
- }
-#endif
- }
-#ifdef CONFIG_ETRAXFS
- else if (port == &ports[1]) {
+ /* Clear any stale date left in the flip buffer */
+ port->readp = port->writep = port->flip;
+ port->in_buffer_len = 0;
+ port->read_ts_idx = 0;
+ port->write_ts_idx = 0;
+
+ if (port->init_irqs != no_irq_setup) {
+ /* Init only on first call. */
+ port->busy++;
+ mutex_unlock(&sync_serial_mutex);
+ return 0;
+ }
+ if (port->use_dma) {
#ifdef SYNC_SER_DMA
- if (request_irq(DMA6_INTR_VECT,
- tr_interrupt,
- 0,
- "synchronous serial 1 dma tr",
- &ports[1])) {
- printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
- goto out;
- } else if (request_irq(DMA7_INTR_VECT,
- rx_interrupt,
- 0,
- "synchronous serial 1 dma rx",
- &ports[1])) {
- free_irq(DMA6_INTR_VECT, &ports[1]);
- printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
- goto out;
- } else if (crisv32_request_dma(
- SYNC_SER1_TX_DMA_NBR,
- "synchronous serial 1 dma tr",
- DMA_VERBOSE_ON_ERROR,
- 0,
- dma_sser1)) {
- free_irq(DMA6_INTR_VECT, &ports[1]);
- free_irq(DMA7_INTR_VECT, &ports[1]);
- printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
- goto out;
- } else if (crisv32_request_dma(
- SYNC_SER1_RX_DMA_NBR,
- "synchronous serial 3 dma rec",
- DMA_VERBOSE_ON_ERROR,
- 0,
- dma_sser1)) {
- crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
- free_irq(DMA6_INTR_VECT, &ports[1]);
- free_irq(DMA7_INTR_VECT, &ports[1]);
- printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
- goto out;
- }
-#endif
- }
+ const char *tmp;
+ DEBUG(pr_info("Using DMA for syncser%d\n", dev));
+
+ tmp = dev == 0 ? "syncser0 tx" : "syncser1 tx";
+ if (request_irq(port->dma_out_intr_vect, tr_interrupt, 0,
+ tmp, port)) {
+ pr_err("Can't alloc syncser%d TX IRQ", dev);
+ ret = -EBUSY;
+ goto unlock_and_exit;
+ }
+ if (artpec_request_dma(port->dma_out_nbr, tmp,
+ DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) {
+ free_irq(port->dma_out_intr_vect, port);
+ pr_err("Can't alloc syncser%d TX DMA", dev);
+ ret = -EBUSY;
+ goto unlock_and_exit;
+ }
+ tmp = dev == 0 ? "syncser0 rx" : "syncser1 rx";
+ if (request_irq(port->dma_in_intr_vect, rx_interrupt, 0,
+ tmp, port)) {
+ artpec_free_dma(port->dma_out_nbr);
+ free_irq(port->dma_out_intr_vect, port);
+ pr_err("Can't alloc syncser%d RX IRQ", dev);
+ ret = -EBUSY;
+ goto unlock_and_exit;
+ }
+ if (artpec_request_dma(port->dma_in_nbr, tmp,
+ DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) {
+ artpec_free_dma(port->dma_out_nbr);
+ free_irq(port->dma_out_intr_vect, port);
+ free_irq(port->dma_in_intr_vect, port);
+ pr_err("Can't alloc syncser%d RX DMA", dev);
+ ret = -EBUSY;
+ goto unlock_and_exit;
+ }
+ /* Enable DMAs */
+ REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
+ REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
+ /* Enable DMA IRQs */
+ REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
+ REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
+ /* Set up wordsize = 1 for DMAs. */
+ DMA_WR_CMD(port->regi_dmain, regk_dma_set_w_size1);
+ DMA_WR_CMD(port->regi_dmaout, regk_dma_set_w_size1);
+
+ start_dma_in(port);
+ port->init_irqs = dma_irq_setup;
#endif
- /* Enable DMAs */
- REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
- REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
- /* Enable DMA IRQs */
- REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
- REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
- /* Set up wordsize = 1 for DMAs. */
- DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
- DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
-
- start_dma_in(port);
- port->init_irqs = 0;
- } else { /* !port->use_dma */
+ } else { /* !port->use_dma */
#ifdef SYNC_SER_MANUAL
- if (port == &ports[0]) {
- if (request_irq(SYNCSER_INTR_VECT,
- manual_interrupt,
- 0,
- "synchronous serial manual irq",
- &ports[0])) {
- printk("Can't allocate sync serial manual irq");
- goto out;
- }
- }
-#ifdef CONFIG_ETRAXFS
- else if (port == &ports[1]) {
- if (request_irq(SSER1_INTR_VECT,
- manual_interrupt,
- 0,
- "synchronous serial manual irq",
- &ports[1])) {
- printk(KERN_CRIT "Can't allocate sync serial manual irq");
- goto out;
- }
- }
-#endif
- port->init_irqs = 0;
+ const char *tmp = dev == 0 ? "syncser0 manual irq" :
+ "syncser1 manual irq";
+ if (request_irq(port->syncser_intr_vect, manual_interrupt,
+ 0, tmp, port)) {
+ pr_err("Can't alloc syncser%d manual irq",
+ dev);
+ ret = -EBUSY;
+ goto unlock_and_exit;
+ }
+ port->init_irqs = manual_irq_setup;
#else
- panic("sync_serial: Manual mode not supported.\n");
+ panic("sync_serial: Manual mode not supported\n");
#endif /* SYNC_SER_MANUAL */
- }
-
- } /* port->init_irqs */
-
+ }
port->busy++;
ret = 0;
-out:
+
+unlock_and_exit:
mutex_unlock(&sync_serial_mutex);
return ret;
}
static int sync_serial_release(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
- sync_port *port;
+ struct sync_port *port;
- if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
- {
- DEBUG(printk("Invalid minor %d\n", dev));
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
+ DEBUG(pr_info("Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
if (port->busy)
port->busy--;
if (!port->busy)
- /* XXX */ ;
+ /* XXX */;
return 0;
}
{
int dev = iminor(file_inode(file));
unsigned int mask = 0;
- sync_port *port;
- DEBUGPOLL( static unsigned int prev_mask = 0; );
+ struct sync_port *port;
+ DEBUGPOLL(
+ static unsigned int prev_mask;
+ );
port = &ports[dev];
- if (!port->started) {
- reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
- reg_sser_rw_rec_cfg rec_cfg =
- REG_RD(sser, port->regi_sser, rw_rec_cfg);
- cfg.en = regk_sser_yes;
- rec_cfg.rec_en = port->input;
- REG_WR(sser, port->regi_sser, rw_cfg, cfg);
- REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
- port->started = 1;
- }
+ if (!port->started)
+ sync_serial_start_port(port);
poll_wait(file, &port->out_wait_q, wait);
poll_wait(file, &port->in_wait_q, wait);
if (port->input && sync_data_avail(port) >= port->inbufchunk)
mask |= POLLIN | POLLRDNORM;
- DEBUGPOLL(if (mask != prev_mask)
- printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
- mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
- prev_mask = mask;
- );
+ DEBUGPOLL(
+ if (mask != prev_mask)
+ pr_info("sync_serial_poll: mask 0x%08X %s %s\n",
+ mask,
+ mask & POLLOUT ? "POLLOUT" : "",
+ mask & POLLIN ? "POLLIN" : "");
+ prev_mask = mask;
+ );
return mask;
}
-static int sync_serial_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
+static ssize_t __sync_serial_read(struct file *file,
+ char __user *buf,
+ size_t count,
+ loff_t *ppos,
+ struct timespec *ts)
+{
+ unsigned long flags;
+ int dev = MINOR(file->f_dentry->d_inode->i_rdev);
+ int avail;
+ struct sync_port *port;
+ unsigned char *start;
+ unsigned char *end;
+
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
+ DEBUG(pr_info("Invalid minor %d\n", dev));
+ return -ENODEV;
+ }
+ port = &ports[dev];
+
+ if (!port->started)
+ sync_serial_start_port(port);
+
+ /* Calculate number of available bytes */
+ /* Save pointers to avoid that they are modified by interrupt */
+ spin_lock_irqsave(&port->lock, flags);
+ start = port->readp;
+ end = port->writep;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ while ((start == end) && !port->in_buffer_len) {
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ wait_event_interruptible(port->in_wait_q,
+ !(start == end && !port->full));
+
+ if (signal_pending(current))
+ return -EINTR;
+
+ spin_lock_irqsave(&port->lock, flags);
+ start = port->readp;
+ end = port->writep;
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
+
+ DEBUGREAD(pr_info("R%d c %d ri %u wi %u /%u\n",
+ dev, count,
+ start - port->flip, end - port->flip,
+ port->in_buffer_size));
+
+ /* Lazy read, never return wrapped data. */
+ if (end > start)
+ avail = end - start;
+ else
+ avail = port->flip + port->in_buffer_size - start;
+
+ count = count > avail ? avail : count;
+ if (copy_to_user(buf, start, count))
+ return -EFAULT;
+
+ /* If timestamp requested, find timestamp of first returned byte
+ * and copy it.
+ * N.B: Applications that request timstamps MUST read data in
+ * chunks that are multiples of IN_DESCR_SIZE.
+ * Otherwise the timestamps will not be aligned to the data read.
+ */
+ if (ts != NULL) {
+ int idx = port->read_ts_idx;
+ memcpy(ts, &port->timestamp[idx], sizeof(struct timespec));
+ port->read_ts_idx += count / IN_DESCR_SIZE;
+ if (port->read_ts_idx >= NBR_IN_DESCR)
+ port->read_ts_idx = 0;
+ }
+
+ spin_lock_irqsave(&port->lock, flags);
+ port->readp += count;
+ /* Check for wrap */
+ if (port->readp >= port->flip + port->in_buffer_size)
+ port->readp = port->flip;
+ port->in_buffer_len -= count;
+ port->full = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ DEBUGREAD(pr_info("r %d\n", count));
+
+ return count;
+}
+
+static ssize_t sync_serial_input(struct file *file, unsigned long arg)
+{
+ struct ssp_request req;
+ int count;
+ int ret;
+
+ /* Copy the request structure from user-mode. */
+ ret = copy_from_user(&req, (struct ssp_request __user *)arg,
+ sizeof(struct ssp_request));
+
+ if (ret) {
+ DEBUG(pr_info("sync_serial_input copy from user failed\n"));
+ return -EFAULT;
+ }
+
+ /* To get the timestamps aligned, make sure that 'len'
+ * is a multiple of IN_DESCR_SIZE.
+ */
+ if ((req.len % IN_DESCR_SIZE) != 0) {
+ DEBUG(pr_info("sync_serial: req.len %x, IN_DESCR_SIZE %x\n",
+ req.len, IN_DESCR_SIZE));
+ return -EFAULT;
+ }
+
+ /* Do the actual read. */
+ /* Note that req.buf is actually a pointer to user space. */
+ count = __sync_serial_read(file, req.buf, req.len,
+ NULL, &req.ts);
+
+ if (count < 0) {
+ DEBUG(pr_info("sync_serial_input read failed\n"));
+ return count;
+ }
+
+ /* Copy the request back to user-mode. */
+ ret = copy_to_user((struct ssp_request __user *)arg, &req,
+ sizeof(struct ssp_request));
+
+ if (ret) {
+ DEBUG(pr_info("syncser input copy2user failed\n"));
+ return -EFAULT;
+ }
+
+ /* Return the number of bytes read. */
+ return count;
+}
+
+
+static int sync_serial_ioctl_unlocked(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
int return_val = 0;
int dma_w_size = regk_dma_set_w_size1;
int dev = iminor(file_inode(file));
- sync_port *port;
+ struct sync_port *port;
reg_sser_rw_tr_cfg tr_cfg;
reg_sser_rw_rec_cfg rec_cfg;
reg_sser_rw_frm_cfg frm_cfg;
reg_sser_rw_cfg gen_cfg;
reg_sser_rw_intr_mask intr_mask;
- if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
- {
- DEBUG(printk("Invalid minor %d\n", dev));
+ if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
+ DEBUG(pr_info("Invalid minor %d\n", dev));
return -1;
}
- port = &ports[dev];
+
+ if (cmd == SSP_INPUT)
+ return sync_serial_input(file, arg);
+
+ port = &ports[dev];
spin_lock_irq(&port->lock);
tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
- switch(cmd)
- {
+ switch (cmd) {
case SSP_SPEED:
- if (GET_SPEED(arg) == CODEC)
- {
+ if (GET_SPEED(arg) == CODEC) {
unsigned int freq;
gen_cfg.base_freq = regk_sser_f32;
case FREQ_256kHz:
gen_cfg.clk_div = 125 *
(1 << (freq - FREQ_256kHz)) - 1;
- break;
+ break;
case FREQ_512kHz:
gen_cfg.clk_div = 62;
- break;
+ break;
case FREQ_1MHz:
case FREQ_2MHz:
case FREQ_4MHz:
gen_cfg.clk_div = 8 * (1 << freq) - 1;
- break;
+ break;
+ }
+ } else if (GET_SPEED(arg) == CODEC_f32768) {
+ gen_cfg.base_freq = regk_sser_f32_768;
+ switch (GET_FREQ(arg)) {
+ case FREQ_4096kHz:
+ gen_cfg.clk_div = 7;
+ break;
+ default:
+ spin_unlock_irq(&port->lock);
+ return -EINVAL;
}
} else {
gen_cfg.base_freq = regk_sser_f29_493;
break;
case SSP_MODE:
- switch(arg)
- {
- case MASTER_OUTPUT:
- port->output = 1;
- port->input = 0;
- frm_cfg.out_on = regk_sser_tr;
- frm_cfg.frame_pin_dir = regk_sser_out;
- gen_cfg.clk_dir = regk_sser_out;
- break;
- case SLAVE_OUTPUT:
- port->output = 1;
- port->input = 0;
- frm_cfg.frame_pin_dir = regk_sser_in;
- gen_cfg.clk_dir = regk_sser_in;
- break;
- case MASTER_INPUT:
- port->output = 0;
- port->input = 1;
- frm_cfg.frame_pin_dir = regk_sser_out;
- frm_cfg.out_on = regk_sser_intern_tb;
- gen_cfg.clk_dir = regk_sser_out;
- break;
- case SLAVE_INPUT:
- port->output = 0;
- port->input = 1;
- frm_cfg.frame_pin_dir = regk_sser_in;
- gen_cfg.clk_dir = regk_sser_in;
- break;
- case MASTER_BIDIR:
- port->output = 1;
- port->input = 1;
- frm_cfg.frame_pin_dir = regk_sser_out;
- frm_cfg.out_on = regk_sser_intern_tb;
- gen_cfg.clk_dir = regk_sser_out;
- break;
- case SLAVE_BIDIR:
- port->output = 1;
- port->input = 1;
- frm_cfg.frame_pin_dir = regk_sser_in;
- gen_cfg.clk_dir = regk_sser_in;
- break;
- default:
- spin_unlock_irq(&port->lock);
- return -EINVAL;
+ switch (arg) {
+ case MASTER_OUTPUT:
+ port->output = 1;
+ port->input = 0;
+ frm_cfg.out_on = regk_sser_tr;
+ frm_cfg.frame_pin_dir = regk_sser_out;
+ gen_cfg.clk_dir = regk_sser_out;
+ break;
+ case SLAVE_OUTPUT:
+ port->output = 1;
+ port->input = 0;
+ frm_cfg.frame_pin_dir = regk_sser_in;
+ gen_cfg.clk_dir = regk_sser_in;
+ break;
+ case MASTER_INPUT:
+ port->output = 0;
+ port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_out;
+ frm_cfg.out_on = regk_sser_intern_tb;
+ gen_cfg.clk_dir = regk_sser_out;
+ break;
+ case SLAVE_INPUT:
+ port->output = 0;
+ port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_in;
+ gen_cfg.clk_dir = regk_sser_in;
+ break;
+ case MASTER_BIDIR:
+ port->output = 1;
+ port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_out;
+ frm_cfg.out_on = regk_sser_intern_tb;
+ gen_cfg.clk_dir = regk_sser_out;
+ break;
+ case SLAVE_BIDIR:
+ port->output = 1;
+ port->input = 1;
+ frm_cfg.frame_pin_dir = regk_sser_in;
+ gen_cfg.clk_dir = regk_sser_in;
+ break;
+ default:
+ spin_unlock_irq(&port->lock);
+ return -EINVAL;
}
- if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
+ if (!port->use_dma || arg == MASTER_OUTPUT ||
+ arg == SLAVE_OUTPUT)
intr_mask.rdav = regk_sser_yes;
break;
case SSP_FRAME_SYNC:
if (arg & NORMAL_SYNC) {
frm_cfg.rec_delay = 1;
frm_cfg.tr_delay = 1;
- }
- else if (arg & EARLY_SYNC)
+ } else if (arg & EARLY_SYNC)
frm_cfg.rec_delay = frm_cfg.tr_delay = 0;
- else if (arg & SECOND_WORD_SYNC) {
+ else if (arg & LATE_SYNC) {
+ frm_cfg.tr_delay = 2;
+ frm_cfg.rec_delay = 2;
+ } else if (arg & SECOND_WORD_SYNC) {
frm_cfg.rec_delay = 7;
frm_cfg.tr_delay = 1;
}
frm_cfg.type = regk_sser_level;
frm_cfg.tr_delay = 1;
frm_cfg.level = regk_sser_neg_lo;
- if (arg & SPI_SLAVE)
- {
+ if (arg & SPI_SLAVE) {
rec_cfg.clk_pol = regk_sser_neg;
gen_cfg.clk_dir = regk_sser_in;
port->input = 1;
port->output = 0;
- }
- else
- {
+ } else {
gen_cfg.out_clk_pol = regk_sser_pos;
port->input = 0;
port->output = 1;
}
static long sync_serial_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
+ unsigned int cmd, unsigned long arg)
{
- long ret;
+ long ret;
- mutex_lock(&sync_serial_mutex);
- ret = sync_serial_ioctl_unlocked(file, cmd, arg);
- mutex_unlock(&sync_serial_mutex);
+ mutex_lock(&sync_serial_mutex);
+ ret = sync_serial_ioctl_unlocked(file, cmd, arg);
+ mutex_unlock(&sync_serial_mutex);
- return ret;
+ return ret;
}
/* NOTE: sync_serial_write does not support concurrency */
-static ssize_t sync_serial_write(struct file *file, const char *buf,
+static ssize_t sync_serial_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
int dev = iminor(file_inode(file));
unsigned char *buf_stop_ptr; /* Last byte + 1 */
if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
- DEBUG(printk("Invalid minor %d\n", dev));
+ DEBUG(pr_info("Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
* |_________|___________________|________________________|
* ^ rd_ptr ^ wr_ptr
*/
- DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n",
- port->port_nbr, count, port->active_tr_descr,
- port->catch_tr_descr));
+ DEBUGWRITE(pr_info("W d%d c %u a: %p c: %p\n",
+ port->port_nbr, count, port->active_tr_descr,
+ port->catch_tr_descr));
/* Read variables that may be updated by interrupts */
spin_lock_irqsave(&port->lock, flags);
if (port->tr_running &&
((port->use_dma && port->active_tr_descr == port->catch_tr_descr) ||
out_buf_count >= OUT_BUFFER_SIZE)) {
- DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev));
+ DEBUGWRITE(pr_info("sser%d full\n", dev));
return -EAGAIN;
}
if (copy_from_user(wr_ptr, buf, trunc_count))
return -EFAULT;
- DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n",
- out_buf_count, trunc_count,
- port->out_buf_count, port->out_buffer,
- wr_ptr, buf_stop_ptr));
+ DEBUGOUTBUF(pr_info("%-4d + %-4d = %-4d %p %p %p\n",
+ out_buf_count, trunc_count,
+ port->out_buf_count, port->out_buffer,
+ wr_ptr, buf_stop_ptr));
/* Make sure transmitter/receiver is running */
if (!port->started) {
reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
- reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
+ reg_sser_rw_rec_cfg rec_cfg =
+ REG_RD(sser, port->regi_sser, rw_rec_cfg);
cfg.en = regk_sser_yes;
rec_cfg.rec_en = port->input;
REG_WR(sser, port->regi_sser, rw_cfg, cfg);
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 */
/* and enable transmitter ready IRQ */
intr_mask.trdy = 1;
REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
+#endif
}
spin_unlock_irqrestore(&port->lock, flags);
/* Exit if non blocking */
if (file->f_flags & O_NONBLOCK) {
- DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n",
- port->port_nbr, trunc_count,
- REG_RD_INT(dma, port->regi_dmaout, r_intr)));
+ DEBUGWRITE(pr_info("w d%d c %u %08x\n",
+ port->port_nbr, trunc_count,
+ REG_RD_INT(dma, port->regi_dmaout, r_intr)));
return trunc_count;
}
if (signal_pending(current))
return -EINTR;
- DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n",
- port->port_nbr, trunc_count));
+ DEBUGWRITE(pr_info("w d%d c %u\n", port->port_nbr, trunc_count));
return trunc_count;
}
-static ssize_t sync_serial_read(struct file * file, char * buf,
+static ssize_t sync_serial_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
- int dev = iminor(file_inode(file));
- int avail;
- sync_port *port;
- unsigned char* start;
- unsigned char* end;
- unsigned long flags;
-
- if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
- {
- DEBUG(printk("Invalid minor %d\n", dev));
- return -ENODEV;
- }
- port = &ports[dev];
-
- DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size));
-
- if (!port->started)
- {
- reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
- reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
- reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
- cfg.en = regk_sser_yes;
- tr_cfg.tr_en = regk_sser_yes;
- rec_cfg.rec_en = regk_sser_yes;
- REG_WR(sser, port->regi_sser, rw_cfg, cfg);
- REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
- REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
- port->started = 1;
- }
-
- /* Calculate number of available bytes */
- /* Save pointers to avoid that they are modified by interrupt */
- spin_lock_irqsave(&port->lock, flags);
- start = (unsigned char*)port->readp; /* cast away volatile */
- end = (unsigned char*)port->writep; /* cast away volatile */
- spin_unlock_irqrestore(&port->lock, flags);
- while ((start == end) && !port->full) /* No data */
- {
- DEBUGREAD(printk(KERN_DEBUG "&"));
- if (file->f_flags & O_NONBLOCK)
- return -EAGAIN;
-
- wait_event_interruptible(port->in_wait_q,
- !(start == end && !port->full));
- if (signal_pending(current))
- return -EINTR;
-
- spin_lock_irqsave(&port->lock, flags);
- start = (unsigned char*)port->readp; /* cast away volatile */
- end = (unsigned char*)port->writep; /* cast away volatile */
- spin_unlock_irqrestore(&port->lock, flags);
- }
-
- /* Lazy read, never return wrapped data. */
- if (port->full)
- avail = port->in_buffer_size;
- else if (end > start)
- avail = end - start;
- else
- avail = port->flip + port->in_buffer_size - start;
-
- count = count > avail ? avail : count;
- if (copy_to_user(buf, start, count))
- return -EFAULT;
- /* Disable interrupts while updating readp */
- spin_lock_irqsave(&port->lock, flags);
- port->readp += count;
- if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
- port->readp = port->flip;
- port->full = 0;
- spin_unlock_irqrestore(&port->lock, flags);
- DEBUGREAD(printk("r %d\n", count));
- return count;
+ return __sync_serial_read(file, buf, count, ppos, NULL);
}
-static void send_word(sync_port* port)
+#ifdef SYNC_SER_MANUAL
+static void send_word(struct sync_port *port)
{
reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
reg_sser_rw_tr_data tr_data = {0};
- switch(tr_cfg.sample_size)
+ switch (tr_cfg.sample_size) {
+ case 8:
+ port->out_buf_count--;
+ tr_data.data = *port->out_rd_ptr++;
+ REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
+ if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
+ port->out_rd_ptr = port->out_buffer;
+ break;
+ case 12:
{
- case 8:
- port->out_buf_count--;
- tr_data.data = *port->out_rd_ptr++;
- REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
- if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
- port->out_rd_ptr = port->out_buffer;
- break;
- case 12:
- {
int data = (*port->out_rd_ptr++) << 8;
data |= *port->out_rd_ptr++;
port->out_buf_count -= 2;
REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
port->out_rd_ptr = port->out_buffer;
+ break;
}
- break;
case 16:
port->out_buf_count -= 2;
tr_data.data = *(unsigned short *)port->out_rd_ptr;
break;
}
}
+#endif
-static void start_dma_out(struct sync_port *port,
- const char *data, int count)
+#ifdef SYNC_SER_DMA
+static void start_dma_out(struct sync_port *port, const char *data, int count)
{
- port->active_tr_descr->buf = (char *) virt_to_phys((char *) data);
+ port->active_tr_descr->buf = (char *)virt_to_phys((char *)data);
port->active_tr_descr->after = port->active_tr_descr->buf + count;
port->active_tr_descr->intr = 1;
port->active_tr_descr->eol = 1;
port->prev_tr_descr->eol = 0;
- DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n",
+ DEBUGTRDMA(pr_info("Inserting eolr:%p eol@:%p\n",
port->prev_tr_descr, port->active_tr_descr));
port->prev_tr_descr = port->active_tr_descr;
- port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next);
+ port->active_tr_descr = phys_to_virt((int)port->active_tr_descr->next);
if (!port->tr_running) {
reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
rw_tr_cfg);
- port->out_context.next = 0;
+ port->out_context.next = NULL;
port->out_context.saved_data =
(dma_descr_data *)virt_to_phys(port->prev_tr_descr);
port->out_context.saved_data_buf = port->prev_tr_descr->buf;
tr_cfg.tr_en = regk_sser_yes;
REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
- DEBUGTRDMA(printk(KERN_DEBUG "dma s\n"););
+ DEBUGTRDMA(pr_info(KERN_INFO "dma s\n"););
} else {
DMA_CONTINUE_DATA(port->regi_dmaout);
- DEBUGTRDMA(printk(KERN_DEBUG "dma c\n"););
+ DEBUGTRDMA(pr_info("dma c\n"););
}
port->tr_running = 1;
}
-static void start_dma_in(sync_port *port)
+static void start_dma_in(struct sync_port *port)
{
int i;
char *buf;
+ unsigned long flags;
+ spin_lock_irqsave(&port->lock, flags);
port->writep = port->flip;
+ spin_unlock_irqrestore(&port->lock, flags);
- if (port->writep > port->flip + port->in_buffer_size) {
- panic("Offset too large in sync serial driver\n");
- return;
- }
- buf = (char*)virt_to_phys(port->in_buffer);
+ buf = (char *)virt_to_phys(port->in_buffer);
for (i = 0; i < NBR_IN_DESCR; i++) {
port->in_descr[i].buf = buf;
port->in_descr[i].after = buf + port->inbufchunk;
port->in_descr[i].intr = 1;
- port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
+ port->in_descr[i].next =
+ (dma_descr_data *)virt_to_phys(&port->in_descr[i+1]);
port->in_descr[i].buf = buf;
buf += port->inbufchunk;
}
/* Link the last descriptor to the first */
- port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
+ port->in_descr[i-1].next =
+ (dma_descr_data *)virt_to_phys(&port->in_descr[0]);
port->in_descr[i-1].eol = regk_sser_yes;
port->next_rx_desc = &port->in_descr[0];
port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1];
- port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
+ port->in_context.saved_data =
+ (dma_descr_data *)virt_to_phys(&port->in_descr[0]);
port->in_context.saved_data_buf = port->in_descr[0].buf;
DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
}
-#ifdef SYNC_SER_DMA
static irqreturn_t tr_interrupt(int irq, void *dev_id)
{
reg_dma_r_masked_intr masked;
- reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
+ reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes };
reg_dma_rw_stat stat;
int i;
int found = 0;
int stop_sser = 0;
for (i = 0; i < NBR_PORTS; i++) {
- sync_port *port = &ports[i];
- if (!port->enabled || !port->use_dma)
+ struct sync_port *port = &ports[i];
+ if (!port->enabled || !port->use_dma)
continue;
/* IRQ active for the port? */
int sent;
sent = port->catch_tr_descr->after -
port->catch_tr_descr->buf;
- DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t"
- "in descr %p (ac: %p)\n",
- port->out_buf_count, sent,
- port->out_buf_count - sent,
- port->catch_tr_descr,
- port->active_tr_descr););
+ DEBUGTXINT(pr_info("%-4d - %-4d = %-4d\t"
+ "in descr %p (ac: %p)\n",
+ port->out_buf_count, sent,
+ port->out_buf_count - sent,
+ port->catch_tr_descr,
+ port->active_tr_descr););
port->out_buf_count -= sent;
port->catch_tr_descr =
phys_to_virt((int) port->catch_tr_descr->next);
port->out_rd_ptr =
phys_to_virt((int) port->catch_tr_descr->buf);
} else {
- int i, sent;
+ reg_sser_rw_tr_cfg tr_cfg;
+ int j, sent;
/* EOL handler.
* Note that if an EOL was encountered during the irq
* locked section of sync_ser_write the DMA will be
* The remaining descriptors will be traversed by
* the descriptor interrupts as usual.
*/
- i = 0;
+ j = 0;
while (!port->catch_tr_descr->eol) {
sent = port->catch_tr_descr->after -
port->catch_tr_descr->buf;
- DEBUGOUTBUF(printk(KERN_DEBUG
+ DEBUGOUTBUF(pr_info(
"traversing descr %p -%d (%d)\n",
port->catch_tr_descr,
sent,
port->out_buf_count -= sent;
port->catch_tr_descr = phys_to_virt(
(int)port->catch_tr_descr->next);
- i++;
- if (i >= NBR_OUT_DESCR) {
+ j++;
+ if (j >= NBR_OUT_DESCR) {
/* TODO: Reset and recover */
panic("sync_serial: missing eol");
}
}
sent = port->catch_tr_descr->after -
port->catch_tr_descr->buf;
- DEBUGOUTBUF(printk(KERN_DEBUG
- "eol at descr %p -%d (%d)\n",
+ DEBUGOUTBUF(pr_info("eol at descr %p -%d (%d)\n",
port->catch_tr_descr,
sent,
port->out_buf_count));
OUT_BUFFER_SIZE)
port->out_rd_ptr = port->out_buffer;
- reg_sser_rw_tr_cfg tr_cfg =
- REG_RD(sser, port->regi_sser, rw_tr_cfg);
- DEBUGTXINT(printk(KERN_DEBUG
+ tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
+ DEBUGTXINT(pr_info(
"tr_int DMA stop %d, set catch @ %p\n",
port->out_buf_count,
port->active_tr_descr));
if (port->out_buf_count != 0)
- printk(KERN_CRIT "sync_ser: buffer not "
- "empty after eol.\n");
+ pr_err("sync_ser: buf not empty after eol\n");
port->catch_tr_descr = port->active_tr_descr;
port->tr_running = 0;
tr_cfg.tr_en = regk_sser_no;
return IRQ_RETVAL(found);
} /* tr_interrupt */
+
+static inline void handle_rx_packet(struct sync_port *port)
+{
+ int idx;
+ reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes };
+ unsigned long flags;
+
+ DEBUGRXINT(pr_info(KERN_INFO "!"));
+ spin_lock_irqsave(&port->lock, flags);
+
+ /* If we overrun the user experience is crap regardless if we
+ * drop new or old data. Its much easier to get it right when
+ * dropping new data so lets do that.
+ */
+ if ((port->writep + port->inbufchunk <=
+ port->flip + port->in_buffer_size) &&
+ (port->in_buffer_len + port->inbufchunk < IN_BUFFER_SIZE)) {
+ memcpy(port->writep,
+ phys_to_virt((unsigned)port->next_rx_desc->buf),
+ port->inbufchunk);
+ port->writep += port->inbufchunk;
+ if (port->writep >= port->flip + port->in_buffer_size)
+ port->writep = port->flip;
+
+ /* Timestamp the new data chunk. */
+ if (port->write_ts_idx == NBR_IN_DESCR)
+ port->write_ts_idx = 0;
+ idx = port->write_ts_idx++;
+ do_posix_clock_monotonic_gettime(&port->timestamp[idx]);
+ port->in_buffer_len += port->inbufchunk;
+ }
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ port->next_rx_desc->eol = 1;
+ port->prev_rx_desc->eol = 0;
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 0);
+ port->prev_rx_desc = port->next_rx_desc;
+ port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
+ /* Cache bug workaround */
+ flush_dma_descr(port->prev_rx_desc, 1);
+ /* wake up the waiting process */
+ wake_up_interruptible(&port->in_wait_q);
+ DMA_CONTINUE(port->regi_dmain);
+ REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
+
+}
+
static irqreturn_t rx_interrupt(int irq, void *dev_id)
{
reg_dma_r_masked_intr masked;
- reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
int i;
int found = 0;
- for (i = 0; i < NBR_PORTS; i++)
- {
- sync_port *port = &ports[i];
+ DEBUG(pr_info("rx_interrupt\n"));
+
+ for (i = 0; i < NBR_PORTS; i++) {
+ struct sync_port *port = &ports[i];
- if (!port->enabled || !port->use_dma )
+ if (!port->enabled || !port->use_dma)
continue;
masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
- if (masked.data) /* Descriptor interrupt */
- {
- found = 1;
- while (REG_RD(dma, port->regi_dmain, rw_data) !=
- virt_to_phys(port->next_rx_desc)) {
- DEBUGRXINT(printk(KERN_DEBUG "!"));
- if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
- int first_size = port->flip + port->in_buffer_size - port->writep;
- memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
- memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
- port->writep = port->flip + port->inbufchunk - first_size;
- } else {
- memcpy((char*)port->writep,
- phys_to_virt((unsigned)port->next_rx_desc->buf),
- port->inbufchunk);
- port->writep += port->inbufchunk;
- if (port->writep >= port->flip + port->in_buffer_size)
- port->writep = port->flip;
- }
- if (port->writep == port->readp)
- {
- port->full = 1;
- }
-
- port->next_rx_desc->eol = 1;
- port->prev_rx_desc->eol = 0;
- /* Cache bug workaround */
- flush_dma_descr(port->prev_rx_desc, 0);
- port->prev_rx_desc = port->next_rx_desc;
- port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
- /* Cache bug workaround */
- flush_dma_descr(port->prev_rx_desc, 1);
- /* wake up the waiting process */
- wake_up_interruptible(&port->in_wait_q);
- DMA_CONTINUE(port->regi_dmain);
- REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
+ if (!masked.data)
+ continue;
- }
- }
+ /* Descriptor interrupt */
+ found = 1;
+ while (REG_RD(dma, port->regi_dmain, rw_data) !=
+ virt_to_phys(port->next_rx_desc))
+ handle_rx_packet(port);
}
return IRQ_RETVAL(found);
} /* rx_interrupt */
#ifdef SYNC_SER_MANUAL
static irqreturn_t manual_interrupt(int irq, void *dev_id)
{
+ unsigned long flags;
int i;
int found = 0;
reg_sser_r_masked_intr masked;
- for (i = 0; i < NBR_PORTS; i++)
- {
- sync_port *port = &ports[i];
+ for (i = 0; i < NBR_PORTS; i++) {
+ struct sync_port *port = &ports[i];
if (!port->enabled || port->use_dma)
- {
continue;
- }
masked = REG_RD(sser, port->regi_sser, r_masked_intr);
- if (masked.rdav) /* Data received? */
- {
- reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
- reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
+ /* Data received? */
+ if (masked.rdav) {
+ reg_sser_rw_rec_cfg rec_cfg =
+ REG_RD(sser, port->regi_sser, rw_rec_cfg);
+ reg_sser_r_rec_data data = REG_RD(sser,
+ port->regi_sser, r_rec_data);
found = 1;
/* Read data */
- switch(rec_cfg.sample_size)
- {
+ spin_lock_irqsave(&port->lock, flags);
+ switch (rec_cfg.sample_size) {
case 8:
*port->writep++ = data.data & 0xff;
break;
case 12:
*port->writep = (data.data & 0x0ff0) >> 4;
*(port->writep + 1) = data.data & 0x0f;
- port->writep+=2;
+ port->writep += 2;
break;
case 16:
- *(unsigned short*)port->writep = data.data;
- port->writep+=2;
+ *(unsigned short *)port->writep = data.data;
+ port->writep += 2;
break;
case 24:
- *(unsigned int*)port->writep = data.data;
- port->writep+=3;
+ *(unsigned int *)port->writep = data.data;
+ port->writep += 3;
break;
case 32:
- *(unsigned int*)port->writep = data.data;
- port->writep+=4;
+ *(unsigned int *)port->writep = data.data;
+ port->writep += 4;
break;
}
- if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
+ /* Wrap? */
+ if (port->writep >= port->flip + port->in_buffer_size)
port->writep = port->flip;
if (port->writep == port->readp) {
- /* receive buffer overrun, discard oldest data
- */
+ /* Receive buf overrun, discard oldest data */
port->readp++;
- if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
+ /* Wrap? */
+ if (port->readp >= port->flip +
+ port->in_buffer_size)
port->readp = port->flip;
}
+ spin_unlock_irqrestore(&port->lock, flags);
if (sync_data_avail(port) >= port->inbufchunk)
- wake_up_interruptible(&port->in_wait_q); /* Wake up application */
+ /* Wake up application */
+ wake_up_interruptible(&port->in_wait_q);
}
- if (masked.trdy) /* Transmitter ready? */
- {
+ /* Transmitter ready? */
+ if (masked.trdy) {
found = 1;
- if (port->out_buf_count > 0) /* More data to send */
+ /* More data to send */
+ if (port->out_buf_count > 0)
send_word(port);
- else /* transmission finished */
- {
+ else {
+ /* Transmission finished */
reg_sser_rw_intr_mask intr_mask;
- intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
+ intr_mask = REG_RD(sser, port->regi_sser,
+ rw_intr_mask);
intr_mask.trdy = 0;
- REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
- wake_up_interruptible(&port->out_wait_q); /* Wake up application */
+ REG_WR(sser, port->regi_sser,
+ rw_intr_mask, intr_mask);
+ /* Wake up application */
+ wake_up_interruptible(&port->out_wait_q);
}
}
}
}
#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");
+
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff