// SPDX-License-Identifier: GPL-2.0
/*
* Simple synchronous serial port driver for ETRAX 100LX.
*
* Synchronous serial ports are used for continuous streamed data like audio.
* The default setting for this driver is compatible with the STA 013 MP3
* decoder. The driver can easily be tuned to fit other audio encoder/decoders
* and SPI
*
* Copyright (c) 2001-2008 Axis Communications AB
*
* Author: Mikael Starvik, Johan Adolfsson
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/major.h>
#include <linux/sched/signal.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <arch/svinto.h>
#include <linux/uaccess.h>
#include <asm/sync_serial.h>
#include <arch/io_interface_mux.h>
/* The receiver is a bit tricky because of the continuous stream of data.*/
/* */
/* Three DMA descriptors are linked together. Each DMA descriptor is */
/* responsible for port->bufchunk of a common buffer. */
/* */
/* +---------------------------------------------+ */
/* | +----------+ +----------+ +----------+ | */
/* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */
/* +----------+ +----------+ +----------+ */
/* | | | */
/* v v v */
/* +-------------------------------------+ */
/* | BUFFER | */
/* +-------------------------------------+ */
/* |<- data_avail ->| */
/* readp writep */
/* */
/* If the application keeps up the pace readp will be right after writep.*/
/* If the application can't keep the pace we have to throw away data. */
/* The idea is that readp should be ready with the data pointed out by */
/* Descr[i] when the DMA has filled in Descr[i+1]. */
/* Otherwise we will discard */
/* the rest of the data pointed out by Descr1 and set readp to the start */
/* of Descr2 */
#define SYNC_SERIAL_MAJOR 125
/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
/* words can be handled */
#define IN_BUFFER_SIZE 12288
#define IN_DESCR_SIZE 256
#define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
#define OUT_BUFFER_SIZE 4096
#define DEFAULT_FRAME_RATE 0
#define DEFAULT_WORD_RATE 7
/* NOTE: Enabling some debug will likely cause overrun or underrun,
* especially if manual mode is use.
*/
#define DEBUG(x)
#define DEBUGREAD(x)
#define DEBUGWRITE(x)
#define DEBUGPOLL(x)
#define DEBUGRXINT(x)
#define DEBUGTXINT(x)
/* Define some macros to access ETRAX 100 registers */
#define SETF(var, reg, field, val) \
do { \
var = (var & ~IO_MASK_(reg##_, field##_)) | \
IO_FIELD_(reg##_, field##_, val); \
} while (0)
#define SETS(var, reg, field, val) \
do { \
var = (var & ~IO_MASK_(reg##_, field##_)) | \
IO_STATE_(reg##_, field##_, _##val); \
} while (0)
struct sync_port {
/* Etrax registers and bits*/
const volatile unsigned *const status;
volatile unsigned *const ctrl_data;
volatile unsigned *const output_dma_first;
volatile unsigned char *const output_dma_cmd;
volatile unsigned char *const output_dma_clr_irq;
volatile unsigned *const input_dma_first;
volatile unsigned char *const input_dma_cmd;
volatile unsigned *const input_dma_descr;
/* 8*4 */
volatile unsigned char *const input_dma_clr_irq;
volatile unsigned *const data_out;
const volatile unsigned *const data_in;
char data_avail_bit; /* In R_IRQ_MASK1_RD/SET/CLR */
char transmitter_ready_bit; /* In R_IRQ_MASK1_RD/SET/CLR */
char input_dma_descr_bit; /* In R_IRQ_MASK2_RD */
char output_dma_bit; /* In R_IRQ_MASK2_RD */
/* End of fields initialised in array */
char started; /* 1 if port has been started */
char port_nbr; /* Port 0 or 1 */
char busy; /* 1 if port is busy */
char enabled; /* 1 if port is enabled */
char use_dma; /* 1 if port uses dma */
char tr_running;
char init_irqs;
/* Register shadow */
unsigned int ctrl_data_shadow;
/* Remaining bytes for current transfer */
volatile unsigned int out_count;
/* Current position in out_buffer */
unsigned char *outp;
/* 16*4 */
/* Next byte to be read by application */
volatile unsigned char *volatile readp;
/* Next byte to be written by etrax */
volatile unsigned char *volatile writep;
unsigned int in_buffer_size;
unsigned int inbufchunk;
struct etrax_dma_descr out_descr __attribute__ ((aligned(32)));
struct etrax_dma_descr in_descr[NUM_IN_DESCR] __attribute__ ((aligned(32)));
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 etrax_dma_descr *next_rx_desc;
struct etrax_dma_descr *prev_rx_desc;
int full;
wait_queue_head_t out_wait_q;
wait_queue_head_t in_wait_q;
};
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 *inode, struct file *file);
static int sync_serial_release(struct inode *inode, struct file *file);
static __poll_t sync_serial_poll(struct file *filp, poll_table *wait);
static long sync_serial_ioctl(struct file *file,
unsigned int cmd, unsigned long arg);
static ssize_t sync_serial_write(struct file *file, const char *buf,
size_t count, loff_t *ppos);
static ssize_t sync_serial_read(struct file *file, char *buf,
size_t count, loff_t *ppos);
#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
(defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)))
#define SYNC_SER_DMA
#endif
static void send_word(struct sync_port *port);
static void start_dma(struct sync_port *port, const char *data, int count);
static void start_dma_in(struct sync_port *port);
#ifdef SYNC_SER_DMA
static irqreturn_t tr_interrupt(int irq, void *dev_id);
static irqreturn_t rx_interrupt(int irq, void *dev_id);
#endif
#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
!defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
(defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
!defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)))
#define SYNC_SER_MANUAL
#endif
#ifdef SYNC_SER_MANUAL
static irqreturn_t manual_interrupt(int irq, void *dev_id);
#endif
/* The ports */
static struct sync_port ports[] = {
{
.status = R_SYNC_SERIAL1_STATUS,
.ctrl_data = R_SYNC_SERIAL1_CTRL,
.output_dma_first = R_DMA_CH8_FIRST,
.output_dma_cmd = R_DMA_CH8_CMD,
.output_dma_clr_irq = R_DMA_CH8_CLR_INTR,
.input_dma_first = R_DMA_CH9_FIRST,
.input_dma_cmd = R_DMA_CH9_CMD,
.input_dma_descr = R_DMA_CH9_DESCR,
.input_dma_clr_irq = R_DMA_CH9_CLR_INTR,
.data_out = R_SYNC_SERIAL1_TR_DATA,
.data_in = R_SYNC_SERIAL1_REC_DATA,
.data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_data),
.transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_ready),
.input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma9_descr),
.output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma8_eop),
.init_irqs = 1,
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
.use_dma = 1,
#else
.use_dma = 0,
#endif
},
{
.status = R_SYNC_SERIAL3_STATUS,
.ctrl_data = R_SYNC_SERIAL3_CTRL,
.output_dma_first = R_DMA_CH4_FIRST,
.output_dma_cmd = R_DMA_CH4_CMD,
.output_dma_clr_irq = R_DMA_CH4_CLR_INTR,
.input_dma_first = R_DMA_CH5_FIRST,
.input_dma_cmd = R_DMA_CH5_CMD,
.input_dma_descr = R_DMA_CH5_DESCR,
.input_dma_clr_irq = R_DMA_CH5_CLR_INTR,
.data_out = R_SYNC_SERIAL3_TR_DATA,
.data_in = R_SYNC_SERIAL3_REC_DATA,
.data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_data),
.transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_ready),
.input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma5_descr),
.output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma4_eop),
.init_irqs = 1,
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
.use_dma = 1,
#else
.use_dma = 0,
#endif
}
};
/* Register shadows */
static unsigned sync_serial_prescale_shadow;
#define NUMBER_OF_PORTS 2
static const struct file_operations sync_serial_fops = {
.owner = THIS_MODULE,
.write = sync_serial_write,
.read = sync_serial_read,
.poll = sync_serial_poll,
.unlocked_ioctl = sync_serial_ioctl,
.open = sync_serial_open,
.release = sync_serial_release,
.llseek = noop_llseek,
};
static int __init etrax_sync_serial_init(void)
{
ports[0].enabled = 0;
ports[1].enabled = 0;
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
if (cris_request_io_interface(if_sync_serial_1, "sync_ser1")) {
printk(KERN_CRIT "ETRAX100LX sync_serial: "
"Could not allocate IO group for port %d\n", 0);
return -EBUSY;
}
#endif
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
if (cris_request_io_interface(if_sync_serial_3, "sync_ser3")) {
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
cris_free_io_interface(if_sync_serial_1);
#endif
printk(KERN_CRIT "ETRAX100LX sync_serial: "
"Could not allocate IO group for port %d\n", 1);
return -EBUSY;
}
#endif
if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
&sync_serial_fops) < 0) {
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
cris_free_io_interface(if_sync_serial_3);
#endif
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
cris_free_io_interface(if_sync_serial_1);
#endif
printk("unable to get major for synchronous serial port\n");
return -EBUSY;
}
/* Deselect synchronous serial ports while configuring. */
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async);
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async);
*R_GEN_CONFIG_II = gen_config_ii_shadow;
/* Initialize Ports */
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
ports[0].enabled = 1;
SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser1, ss1extra);
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync);
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
ports[0].use_dma = 1;
#else
ports[0].use_dma = 0;
#endif
initialize_port(0);
#endif
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
ports[1].enabled = 1;
SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser3, ss3extra);
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync);
#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
ports[1].use_dma = 1;
#else
ports[1].use_dma = 0;
#endif
initialize_port(1);
#endif
*R_PORT_PB_I2C = port_pb_i2c_shadow; /* Use PB4/PB7 */
/* Set up timing */
*R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow = (
IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u1, codec) |
IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u1, external) |
IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u3, codec) |
IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u3, external) |
IO_STATE(R_SYNC_SERIAL_PRESCALE, prescaler, div4) |
IO_FIELD(R_SYNC_SERIAL_PRESCALE, frame_rate,
DEFAULT_FRAME_RATE) |
IO_FIELD(R_SYNC_SERIAL_PRESCALE, word_rate, DEFAULT_WORD_RATE) |
IO_STATE(R_SYNC_SERIAL_PRESCALE, warp_mode, normal));
/* Select synchronous ports */
*R_GEN_CONFIG_II = gen_config_ii_shadow;
printk(KERN_INFO "ETRAX 100LX synchronous serial port driver\n");
return 0;
}
static void __init initialize_port(int portnbr)
{
struct sync_port *port = &ports[portnbr];
DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
port->started = 0;
port->port_nbr = portnbr;
port->busy = 0;
port->tr_running = 0;
port->out_count = 0;
port->outp = port->out_buffer;
port->readp = port->flip;
port->writep = port->flip;
port->in_buffer_size = IN_BUFFER_SIZE;
port->inbufchunk = IN_DESCR_SIZE;
port->next_rx_desc = &port->in_descr[0];
port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1];
port->prev_rx_desc->ctrl = d_eol;
init_waitqueue_head(&port->out_wait_q);
init_waitqueue_head(&port->in_wait_q);
port->ctrl_data_shadow =
IO_STATE(R_SYNC_SERIAL1_CTRL, tr_baud, c115k2Hz) |
IO_STATE(R_SYNC_SERIAL1_CTRL, mode, master_output) |
IO_STATE(R_SYNC_SERIAL1_CTRL, error, ignore) |
IO_STATE(R_SYNC_SERIAL1_CTRL, rec_enable, disable) |
IO_STATE(R_SYNC_SERIAL1_CTRL, f_synctype, normal) |
IO_STATE(R_SYNC_SERIAL1_CTRL, f_syncsize, word) |
IO_STATE(R_SYNC_SERIAL1_CTRL, f_sync, on) |
IO_STATE(R_SYNC_SERIAL1_CTRL, clk_mode, normal) |
IO_STATE(R_SYNC_SERIAL1_CTRL, clk_halt, stopped) |
IO_STATE(R_SYNC_SERIAL1_CTRL, bitorder, msb) |
IO_STATE(R_SYNC_SERIAL1_CTRL, tr_enable, disable) |
IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit) |
IO_STATE(R_SYNC_SERIAL1_CTRL, buf_empty, lmt_8) |
IO_STATE(R_SYNC_SERIAL1_CTRL, buf_full, lmt_8) |
IO_STATE(R_SYNC_SERIAL1_CTRL, flow_ctrl, enabled) |
IO_STATE(R_SYNC_SERIAL1_CTRL, clk_polarity, neg) |
IO_STATE(R_SYNC_SERIAL1_CTRL, frame_polarity, normal)|
IO_STATE(R_SYNC_SERIAL1_CTRL, status_polarity, inverted)|
IO_STATE(R_SYNC_SERIAL1_CTRL, clk_driver, normal) |
IO_STATE(R_SYNC_SERIAL1_CTRL, frame_driver, normal) |
IO_STATE(R_SYNC_SERIAL1_CTRL, status_driver, normal)|
IO_STATE(R_SYNC_SERIAL1_CTRL, def_out0, high);
if (port->use_dma)
port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL,
dma_enable, on);
else
port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL,
dma_enable, off);
*port->ctrl_data = port->ctrl_data_shadow;
}
static inline int sync_data_avail(struct sync_port *port)
{
int avail;
unsigned char *start;
unsigned char *end;
start = (unsigned char *)port->readp; /* cast away volatile */
end = (unsigned char *)port->writep; /* cast away volatile */
/* 0123456789 0123456789
* ----- - -----
* ^rp ^wp ^wp ^rp
*/
if (end >= start)
avail = end - start;
else
avail = port->in_buffer_size - (start - end);
return avail;
}
static inline int sync_data_avail_to_end(struct sync_port *port)
{
int avail;
unsigned char *start;
unsigned char *end;
start = (unsigned char *)port->readp; /* cast away volatile */
end = (unsigned char *)port->writep; /* cast away volatile */
/* 0123456789 0123456789
* ----- -----
* ^rp ^wp ^wp ^rp
*/
if (end >= start)
avail = end - start;
else
avail = port->flip + port->in_buffer_size - start;
return avail;
}
static int sync_serial_open(struct inode *inode, struct file *file)
{
int dev = MINOR(inode->i_rdev);
struct sync_port *port;
int mode;
int err = -EBUSY;
mutex_lock(&sync_serial_mutex);
DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
err = -ENODEV;
goto out;
}
port = &ports[dev];
/* Allow open this device twice (assuming one reader and one writer) */
if (port->busy == 2) {
DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
goto out;
}
if (port->init_irqs) {
if (port->use_dma) {
if (port == &ports[0]) {
#ifdef SYNC_SER_DMA
if (request_irq(24, tr_interrupt, 0,
"synchronous serial 1 dma tr",
&ports[0])) {
printk(KERN_CRIT "Can't alloc "
"sync serial port 1 IRQ");
goto out;
} else if (request_irq(25, rx_interrupt, 0,
"synchronous serial 1 dma rx",
&ports[0])) {
free_irq(24, &port[0]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 1 IRQ");
goto out;
} else if (cris_request_dma(8,
"synchronous serial 1 dma tr",
DMA_VERBOSE_ON_ERROR,
dma_ser1)) {
free_irq(24, &port[0]);
free_irq(25, &port[0]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 1 "
"TX DMA channel");
goto out;
} else if (cris_request_dma(9,
"synchronous serial 1 dma rec",
DMA_VERBOSE_ON_ERROR,
dma_ser1)) {
cris_free_dma(8, NULL);
free_irq(24, &port[0]);
free_irq(25, &port[0]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 1 "
"RX DMA channel");
goto out;
}
#endif
RESET_DMA(8); WAIT_DMA(8);
RESET_DMA(9); WAIT_DMA(9);
*R_DMA_CH8_CLR_INTR =
IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop,
do) |
IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr,
do);
*R_DMA_CH9_CLR_INTR =
IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop,
do) |
IO_STATE(R_DMA_CH9_CLR_INTR, clr_descr,
do);
*R_IRQ_MASK2_SET =
IO_STATE(R_IRQ_MASK2_SET, dma8_eop,
set) |
IO_STATE(R_IRQ_MASK2_SET, dma9_descr,
set);
} else if (port == &ports[1]) {
#ifdef SYNC_SER_DMA
if (request_irq(20, tr_interrupt, 0,
"synchronous serial 3 dma tr",
&ports[1])) {
printk(KERN_CRIT "Can't alloc "
"sync serial port 3 IRQ");
goto out;
} else if (request_irq(21, rx_interrupt, 0,
"synchronous serial 3 dma rx",
&ports[1])) {
free_irq(20, &ports[1]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 3 IRQ");
goto out;
} else if (cris_request_dma(4,
"synchronous serial 3 dma tr",
DMA_VERBOSE_ON_ERROR,
dma_ser3)) {
free_irq(21, &ports[1]);
free_irq(20, &ports[1]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 3 "
"TX DMA channel");
goto out;
} else if (cris_request_dma(5,
"synchronous serial 3 dma rec",
DMA_VERBOSE_ON_ERROR,
dma_ser3)) {
cris_free_dma(4, NULL);
free_irq(21, &ports[1]);
free_irq(20, &ports[1]);
printk(KERN_CRIT "Can't alloc "
"sync serial port 3 "
"RX DMA channel");
goto out;
}
#endif
RESET_DMA(4); WAIT_DMA(4);
RESET_DMA(5); WAIT_DMA(5);
*R_DMA_CH4_CLR_INTR =
IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop,
do) |
IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr,
do);
*R_DMA_CH5_CLR_INTR =
IO_STATE(R_DMA_CH5_CLR_INTR, clr_eop,
do) |
IO_STATE(R_DMA_CH5_CLR_INTR, clr_descr,
do);
*R_IRQ_MASK2_SET =
IO_STATE(R_IRQ_MASK2_SET, dma4_eop,
set) |
IO_STATE(R_IRQ_MASK2_SET, dma5_descr,
set);
}
start_dma_in(port);
port->init_irqs = 0;
} else { /* !port->use_dma */
#ifdef SYNC_SER_MANUAL
if (port == &ports[0]) {
if (request_irq(8,
manual_interrupt,
IRQF_SHARED,
"synchronous serial manual irq",
&ports[0])) {
printk(KERN_CRIT "Can't alloc "
"sync serial manual irq");
goto out;
}
} else if (port == &ports[1]) {
if (request_irq(8,
manual_interrupt,
IRQF_SHARED,
"synchronous serial manual irq",
&ports[1])) {
printk(KERN_CRIT "Can't alloc "
"sync serial manual irq");
goto out;
}
}
port->init_irqs = 0;
#else
panic("sync_serial: Manual mode not supported.\n");
#endif /* SYNC_SER_MANUAL */
}
} /* port->init_irqs */
port->busy++;
/* Start port if we use it as input */
mode = IO_EXTRACT(R_SYNC_SERIAL1_CTRL, mode, port->ctrl_data_shadow);
if (mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_input) ||
mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_input) ||
mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_bidir) ||
mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_bidir)) {
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
running);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
enable);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
enable);
port->started = 1;
*port->ctrl_data = port->ctrl_data_shadow;
if (!port->use_dma)
*R_IRQ_MASK1_SET = 1 << port->data_avail_bit;
DEBUG(printk(KERN_DEBUG "sser%d rec started\n", dev));
}
err = 0;
out:
mutex_unlock(&sync_serial_mutex);
return err;
}
static int sync_serial_release(struct inode *inode, struct file *file)
{
int dev = MINOR(inode->i_rdev);
struct sync_port *port;
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
if (port->busy)
port->busy--;
if (!port->busy)
*R_IRQ_MASK1_CLR = ((1 << port->data_avail_bit) |
(1 << port->transmitter_ready_bit));
return 0;
}
static __poll_t sync_serial_poll(struct file *file, poll_table *wait)
{
int dev = MINOR(file_inode(file)->i_rdev);
__poll_t mask = 0;
struct sync_port *port;
DEBUGPOLL(static __poll_t prev_mask = 0);
port = &ports[dev];
poll_wait(file, &port->out_wait_q, wait);
poll_wait(file, &port->in_wait_q, wait);
/* Some room to write */
if (port->out_count < OUT_BUFFER_SIZE)
mask |= POLLOUT | POLLWRNORM;
/* At least an inbufchunk of data */
if (sync_data_avail(port) >= port->inbufchunk)
mask |= POLLIN | POLLRDNORM;
DEBUGPOLL(if (mask != prev_mask)
printk(KERN_DEBUG "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_unlocked(struct file *file,
unsigned int cmd, unsigned long arg)
{
int return_val = 0;
unsigned long flags;
int dev = MINOR(file_inode(file)->i_rdev);
struct sync_port *port;
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
return -1;
}
port = &ports[dev];
local_irq_save(flags);
/* Disable port while changing config */
if (dev) {
if (port->use_dma) {
RESET_DMA(4); WAIT_DMA(4);
port->tr_running = 0;
port->out_count = 0;
port->outp = port->out_buffer;
*R_DMA_CH4_CLR_INTR =
IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, do) |
IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do);
}
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async);
} else {
if (port->use_dma) {
RESET_DMA(8); WAIT_DMA(8);
port->tr_running = 0;
port->out_count = 0;
port->outp = port->out_buffer;
*R_DMA_CH8_CLR_INTR =
IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, do) |
IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, do);
}
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async);
}
*R_GEN_CONFIG_II = gen_config_ii_shadow;
local_irq_restore(flags);
switch (cmd) {
case SSP_SPEED:
if (GET_SPEED(arg) == CODEC) {
if (dev)
SETS(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, clk_sel_u3,
codec);
else
SETS(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, clk_sel_u1,
codec);
SETF(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, prescaler,
GET_FREQ(arg));
SETF(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, frame_rate,
GET_FRAME_RATE(arg));
SETF(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, word_rate,
GET_WORD_RATE(arg));
} else {
SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
tr_baud, GET_SPEED(arg));
if (dev)
SETS(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, clk_sel_u3,
baudrate);
else
SETS(sync_serial_prescale_shadow,
R_SYNC_SERIAL_PRESCALE, clk_sel_u1,
baudrate);
}
break;
case SSP_MODE:
if (arg > 5)
return -EINVAL;
if (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT)
*R_IRQ_MASK1_CLR = 1 << port->data_avail_bit;
else if (!port->use_dma)
*R_IRQ_MASK1_SET = 1 << port->data_avail_bit;
SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, mode, arg);
break;
case SSP_FRAME_SYNC:
if (arg & NORMAL_SYNC)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_synctype, normal);
else if (arg & EARLY_SYNC)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_synctype, early);
if (arg & BIT_SYNC)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_syncsize, bit);
else if (arg & WORD_SYNC)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_syncsize, word);
else if (arg & EXTENDED_SYNC)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_syncsize, extended);
if (arg & SYNC_ON)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_sync, on);
else if (arg & SYNC_OFF)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
f_sync, off);
if (arg & WORD_SIZE_8)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
wordsize, size8bit);
else if (arg & WORD_SIZE_12)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
wordsize, size12bit);
else if (arg & WORD_SIZE_16)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
wordsize, size16bit);
else if (arg & WORD_SIZE_24)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
wordsize, size24bit);
else if (arg & WORD_SIZE_32)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
wordsize, size32bit);
if (arg & BIT_ORDER_MSB)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
bitorder, msb);
else if (arg & BIT_ORDER_LSB)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
bitorder, lsb);
if (arg & FLOW_CONTROL_ENABLE)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
flow_ctrl, enabled);
else if (arg & FLOW_CONTROL_DISABLE)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
flow_ctrl, disabled);
if (arg & CLOCK_NOT_GATED)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_mode, normal);
else if (arg & CLOCK_GATED)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_mode, gated);
break;
case SSP_IPOLARITY:
/* NOTE!! negedge is considered NORMAL */
if (arg & CLOCK_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_polarity, neg);
else if (arg & CLOCK_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_polarity, pos);
if (arg & FRAME_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_polarity, normal);
else if (arg & FRAME_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_polarity, inverted);
if (arg & STATUS_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
status_polarity, normal);
else if (arg & STATUS_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
status_polarity, inverted);
break;
case SSP_OPOLARITY:
if (arg & CLOCK_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_driver, normal);
else if (arg & CLOCK_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_driver, inverted);
if (arg & FRAME_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_driver, normal);
else if (arg & FRAME_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_driver, inverted);
if (arg & STATUS_NORMAL)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
status_driver, normal);
else if (arg & STATUS_INVERT)
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
status_driver, inverted);
break;
case SSP_SPI:
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, flow_ctrl,
disabled);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, bitorder,
msb);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, wordsize,
size8bit);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_sync, on);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_syncsize,
word);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_synctype,
normal);
if (arg & SPI_SLAVE) {
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_polarity, inverted);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_polarity, neg);
SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
mode, SLAVE_INPUT);
} else {
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
frame_driver, inverted);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
clk_driver, inverted);
SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
mode, MASTER_OUTPUT);
}
break;
case SSP_INBUFCHUNK:
#if 0
if (arg > port->in_buffer_size/NUM_IN_DESCR)
return -EINVAL;
port->inbufchunk = arg;
/* Make sure in_buffer_size is a multiple of inbufchunk */
port->in_buffer_size =
(port->in_buffer_size/port->inbufchunk) *
port->inbufchunk;
DEBUG(printk(KERN_DEBUG "inbufchunk %i in_buffer_size: %i\n",
port->inbufchunk, port->in_buffer_size));
if (port->use_dma) {
if (port->port_nbr == 0) {
RESET_DMA(9);
WAIT_DMA(9);
} else {
RESET_DMA(5);
WAIT_DMA(5);
}
start_dma_in(port);
}
#endif
break;
default:
return_val = -1;
}
/* Make sure we write the config without interruption */
local_irq_save(flags);
/* Set config and enable port */
*port->ctrl_data = port->ctrl_data_shadow;
nop(); nop(); nop(); nop();
*R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow;
nop(); nop(); nop(); nop();
if (dev)
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync);
else
SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync);
*R_GEN_CONFIG_II = gen_config_ii_shadow;
/* Reset DMA. At readout from serial port the data could be shifted
* one byte if not resetting DMA.
*/
if (port->use_dma) {
if (port->port_nbr == 0) {
RESET_DMA(9);
WAIT_DMA(9);
} else {
RESET_DMA(5);
WAIT_DMA(5);
}
start_dma_in(port);
}
local_irq_restore(flags);
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;
}
static ssize_t sync_serial_write(struct file *file, const char *buf,
size_t count, loff_t *ppos)
{
int dev = MINOR(file_inode(file)->i_rdev);
DECLARE_WAITQUEUE(wait, current);
struct sync_port *port;
unsigned long flags;
unsigned long c, c1;
unsigned long free_outp;
unsigned long outp;
unsigned long out_buffer;
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu (%d/%d)\n",
port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE));
/* Space to end of buffer */
/*
* out_buffer <c1>012345<- c ->OUT_BUFFER_SIZE
* outp^ +out_count
* ^free_outp
* out_buffer 45<- c ->0123OUT_BUFFER_SIZE
* +out_count outp^
* free_outp
*
*/
/* Read variables that may be updated by interrupts */
local_irq_save(flags);
if (count > OUT_BUFFER_SIZE - port->out_count)
count = OUT_BUFFER_SIZE - port->out_count;
outp = (unsigned long)port->outp;
free_outp = outp + port->out_count;
local_irq_restore(flags);
out_buffer = (unsigned long)port->out_buffer;
/* Find out where and how much to write */
if (free_outp >= out_buffer + OUT_BUFFER_SIZE)
free_outp -= OUT_BUFFER_SIZE;
if (free_outp >= outp)
c = out_buffer + OUT_BUFFER_SIZE - free_outp;
else
c = outp - free_outp;
if (c > count)
c = count;
DEBUGWRITE(printk(KERN_DEBUG "w op %08lX fop %08lX c %lu\n",
outp, free_outp, c));
if (copy_from_user((void *)free_outp, buf, c))
return -EFAULT;
if (c != count) {
buf += c;
c1 = count - c;
DEBUGWRITE(printk(KERN_DEBUG "w2 fi %lu c %lu c1 %lu\n",
free_outp-out_buffer, c, c1));
if (copy_from_user((void *)out_buffer, buf, c1))
return -EFAULT;
}
local_irq_save(flags);
port->out_count += count;
local_irq_restore(flags);
/* Make sure transmitter/receiver is running */
if (!port->started) {
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
running);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
enable);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
enable);
port->started = 1;
}
*port->ctrl_data = port->ctrl_data_shadow;
if (file->f_flags & O_NONBLOCK) {
local_irq_save(flags);
if (!port->tr_running) {
if (!port->use_dma) {
/* Start sender by writing data */
send_word(port);
/* and enable transmitter ready IRQ */
*R_IRQ_MASK1_SET = 1 <<
port->transmitter_ready_bit;
} else
start_dma(port,
(unsigned char *volatile)port->outp, c);
}
local_irq_restore(flags);
DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu NB\n",
port->port_nbr, count));
return count;
}
/* Sleep until all sent */
add_wait_queue(&port->out_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
local_irq_save(flags);
if (!port->tr_running) {
if (!port->use_dma) {
/* Start sender by writing data */
send_word(port);
/* and enable transmitter ready IRQ */
*R_IRQ_MASK1_SET = 1 << port->transmitter_ready_bit;
} else
start_dma(port, port->outp, c);
}
local_irq_restore(flags);
schedule();
remove_wait_queue(&port->out_wait_q, &wait);
if (signal_pending(current))
return -EINTR;
DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", port->port_nbr, count));
return count;
}
static ssize_t sync_serial_read(struct file *file, char *buf,
size_t count, loff_t *ppos)
{
int dev = MINOR(file_inode(file)->i_rdev);
int avail;
struct sync_port *port;
unsigned char *start;
unsigned char *end;
unsigned long flags;
if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
DEBUGREAD(printk(KERN_DEBUG "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) {
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
running);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
enable);
SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
enable);
port->started = 1;
}
*port->ctrl_data = port->ctrl_data_shadow;
/* Calculate number of available bytes */
/* Save pointers to avoid that they are modified by interrupt */
local_irq_save(flags);
start = (unsigned char *)port->readp; /* cast away volatile */
end = (unsigned char *)port->writep; /* cast away volatile */
local_irq_restore(flags);
while (start == end && !port->full) {
/* No data */
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;
local_irq_save(flags);
start = (unsigned char *)port->readp; /* cast away volatile */
end = (unsigned char *)port->writep; /* cast away volatile */
local_irq_restore(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 */
local_irq_save(flags);
port->readp += count;
if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
port->readp = port->flip;
port->full = 0;
local_irq_restore(flags);
DEBUGREAD(printk(KERN_DEBUG "r %d\n", count));
return count;
}
static void send_word(struct sync_port *port)
{
switch (IO_EXTRACT(R_SYNC_SERIAL1_CTRL, wordsize,
port->ctrl_data_shadow)) {
case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit):
port->out_count--;
*port->data_out = *port->outp++;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
break;
case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit):
{
int data = (*port->outp++) << 8;
data |= *port->outp++;
port->out_count -= 2;
*port->data_out = data;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
break;
}
case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit):
port->out_count -= 2;
*port->data_out = *(unsigned short *)port->outp;
port->outp += 2;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
break;
case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit):
port->out_count -= 3;
*port->data_out = *(unsigned int *)port->outp;
port->outp += 3;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
break;
case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit):
port->out_count -= 4;
*port->data_out = *(unsigned int *)port->outp;
port->outp += 4;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
break;
}
}
static void start_dma(struct sync_port *port, const char *data, int count)
{
port->tr_running = 1;
port->out_descr.hw_len = 0;
port->out_descr.next = 0;
port->out_descr.ctrl = d_eol | d_eop; /* No d_wait to avoid glitches */
port->out_descr.sw_len = count;
port->out_descr.buf = virt_to_phys(data);
port->out_descr.status = 0;
*port->output_dma_first = virt_to_phys(&port->out_descr);
*port->output_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start);
DEBUGTXINT(printk(KERN_DEBUG "dma %08lX c %d\n",
(unsigned long)data, count));
}
static void start_dma_in(struct sync_port *port)
{
int i;
unsigned long buf;
port->writep = port->flip;
if (port->writep > port->flip + port->in_buffer_size) {
panic("Offset too large in sync serial driver\n");
return;
}
buf = virt_to_phys(port->in_buffer);
for (i = 0; i < NUM_IN_DESCR; i++) {
port->in_descr[i].sw_len = port->inbufchunk;
port->in_descr[i].ctrl = d_int;
port->in_descr[i].next = virt_to_phys(&port->in_descr[i+1]);
port->in_descr[i].buf = buf;
port->in_descr[i].hw_len = 0;
port->in_descr[i].status = 0;
port->in_descr[i].fifo_len = 0;
buf += port->inbufchunk;
prepare_rx_descriptor(&port->in_descr[i]);
}
/* Link the last descriptor to the first */
port->in_descr[i-1].next = virt_to_phys(&port->in_descr[0]);
port->in_descr[i-1].ctrl |= d_eol;
port->next_rx_desc = &port->in_descr[0];
port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1];
*port->input_dma_first = virt_to_phys(port->next_rx_desc);
*port->input_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start);
}
#ifdef SYNC_SER_DMA
static irqreturn_t tr_interrupt(int irq, void *dev_id)
{
unsigned long ireg = *R_IRQ_MASK2_RD;
struct etrax_dma_descr *descr;
unsigned int sentl;
int handled = 0;
int i;
for (i = 0; i < NUMBER_OF_PORTS; i++) {
struct sync_port *port = &ports[i];
if (!port->enabled || !port->use_dma)
continue;
/* IRQ active for the port? */
if (!(ireg & (1 << port->output_dma_bit)))
continue;
handled = 1;
/* Clear IRQ */
*port->output_dma_clr_irq =
IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do) |
IO_STATE(R_DMA_CH0_CLR_INTR, clr_descr, do);
descr = &port->out_descr;
if (!(descr->status & d_stop))
sentl = descr->sw_len;
else
/* Otherwise find amount of data sent here */
sentl = descr->hw_len;
port->out_count -= sentl;
port->outp += sentl;
if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
port->outp = port->out_buffer;
if (port->out_count) {
int c = port->out_buffer + OUT_BUFFER_SIZE - port->outp;
if (c > port->out_count)
c = port->out_count;
DEBUGTXINT(printk(KERN_DEBUG
"tx_int DMAWRITE %i %i\n", sentl, c));
start_dma(port, port->outp, c);
} else {
DEBUGTXINT(printk(KERN_DEBUG
"tx_int DMA stop %i\n", sentl));
port->tr_running = 0;
}
/* wake up the waiting process */
wake_up_interruptible(&port->out_wait_q);
}
return IRQ_RETVAL(handled);
} /* tr_interrupt */
static irqreturn_t rx_interrupt(int irq, void *dev_id)
{
unsigned long ireg = *R_IRQ_MASK2_RD;
int i;
int handled = 0;
for (i = 0; i < NUMBER_OF_PORTS; i++) {
struct sync_port *port = &ports[i];
if (!port->enabled || !port->use_dma)
continue;
if (!(ireg & (1 << port->input_dma_descr_bit)))
continue;
/* Descriptor interrupt */
handled = 1;
while (*port->input_dma_descr !=
virt_to_phys(port->next_rx_desc)) {
if (port->writep + port->inbufchunk > port->flip +
port->in_buffer_size) {
int first_size = port->flip +
port->in_buffer_size - port->writep;
memcpy(port->writep,
phys_to_virt(port->next_rx_desc->buf),
first_size);
memcpy(port->flip,
phys_to_virt(port->next_rx_desc->buf +
first_size),
port->inbufchunk - first_size);
port->writep = port->flip +
port->inbufchunk - first_size;
} else {
memcpy(port->writep,
phys_to_virt(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;
prepare_rx_descriptor(port->next_rx_desc);
port->next_rx_desc->ctrl |= d_eol;
port->prev_rx_desc->ctrl &= ~d_eol;
port->prev_rx_desc = phys_to_virt((unsigned)
port->next_rx_desc);
port->next_rx_desc = phys_to_virt((unsigned)
port->next_rx_desc->next);
/* Wake up the waiting process */
wake_up_interruptible(&port->in_wait_q);
*port->input_dma_cmd = IO_STATE(R_DMA_CH1_CMD,
cmd, restart);
/* DMA has reached end of descriptor */
*port->input_dma_clr_irq = IO_STATE(R_DMA_CH0_CLR_INTR,
clr_descr, do);
}
}
return IRQ_RETVAL(handled);
} /* rx_interrupt */
#endif /* SYNC_SER_DMA */
#ifdef SYNC_SER_MANUAL
static irqreturn_t manual_interrupt(int irq, void *dev_id)
{
int i;
int handled = 0;
for (i = 0; i < NUMBER_OF_PORTS; i++) {
struct sync_port *port = &ports[i];
if (!port->enabled || port->use_dma)
continue;
/* Data received? */
if (*R_IRQ_MASK1_RD & (1 << port->data_avail_bit)) {
handled = 1;
/* Read data */
switch (port->ctrl_data_shadow &
IO_MASK(R_SYNC_SERIAL1_CTRL, wordsize)) {
case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit):
*port->writep++ =
*(volatile char *)port->data_in;
break;
case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit):
{
int data = *(unsigned short *)port->data_in;
*port->writep = (data & 0x0ff0) >> 4;
*(port->writep + 1) = data & 0x0f;
port->writep += 2;
break;
}
case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit):
*(unsigned short *)port->writep =
*(volatile unsigned short *)port->data_in;
port->writep += 2;
break;
case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit):
*(unsigned int *)port->writep = *port->data_in;
port->writep += 3;
break;
case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit):
*(unsigned int *)port->writep = *port->data_in;
port->writep += 4;
break;
}
/* Wrap? */
if (port->writep >= port->flip + port->in_buffer_size)
port->writep = port->flip;
if (port->writep == port->readp) {
/* Receive buffer overrun, discard oldest */
port->readp++;
/* Wrap? */
if (port->readp >= port->flip +
port->in_buffer_size)
port->readp = port->flip;
}
if (sync_data_avail(port) >= port->inbufchunk) {
/* Wake up application */
wake_up_interruptible(&port->in_wait_q);
}
}
/* Transmitter ready? */
if (*R_IRQ_MASK1_RD & (1 << port->transmitter_ready_bit)) {
if (port->out_count > 0) {
/* More data to send */
send_word(port);
} else {
/* Transmission finished */
/* Turn off IRQ */
*R_IRQ_MASK1_CLR = 1 <<
port->transmitter_ready_bit;
/* Wake up application */
wake_up_interruptible(&port->out_wait_q);
}
}
}
return IRQ_RETVAL(handled);
}
#endif
module_init(etrax_sync_serial_init);
