static void stp_uart_rx_handling(unsigned long func_data){
unsigned int how_much_get = 0;
unsigned int how_much_to_get = 0;
unsigned int flag = 0;
// read_lock(&g_stp_uart_rx_handling_lock);
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
if (how_much_to_get >= RX_BUFFER_LEN)
{
flag = 1;
UART_INFO_FUNC ("fifolen(%d)\n", how_much_to_get);
}
do{
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))
how_much_get= kfifo_get(g_stp_uart_rx_fifo, g_rx_data, RX_BUFFER_LEN);
#else
how_much_get= kfifo_out(g_stp_uart_rx_fifo, g_rx_data, RX_BUFFER_LEN);
#endif
//UART_INFO_FUNC ("fifoget(%d)\n", how_much_get);
mtk_wcn_stp_parser_data((UINT8 *)g_rx_data, how_much_get);
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
}while(how_much_to_get > 0);
// read_unlock(&g_stp_uart_rx_handling_lock);
if (1 == flag)
{
UART_INFO_FUNC ("finish, fifolen(%d)\n", kfifo_len(g_stp_uart_rx_fifo));
}
}
static void stp_uart_rx_handling(unsigned long func_data){
#define LOCAL_BUFFER_LEN 1024
unsigned char data[LOCAL_BUFFER_LEN];
unsigned int how_much_get = 0;
unsigned int how_much_to_get = 0;
unsigned int flag = 0;
#if LDISC_RX_TASKLET_RWLOCK
read_lock(&g_stp_uart_rx_handling_lock);
#endif
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
if (how_much_to_get >= LOCAL_BUFFER_LEN)
{
flag = 1;
UART_INFO_FUNC ("fifolen(%d)\n", how_much_to_get);
}
do {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33))
how_much_get= kfifo_get(g_stp_uart_rx_fifo, data, LOCAL_BUFFER_LEN);
#else
how_much_get= kfifo_out(g_stp_uart_rx_fifo, data, LOCAL_BUFFER_LEN);
#endif
UART_INFO_FUNC ("fifoget(%d)\n", how_much_get);
mtk_wcn_stp_parser_data((UINT8 *)data, how_much_get);
how_much_to_get = kfifo_len(g_stp_uart_rx_fifo);
}while(how_much_to_get > 0);
#if LDISC_RX_TASKLET_RWLOCK
read_unlock(&g_stp_uart_rx_handling_lock);
#endif
if (1 == flag)
{
UART_INFO_FUNC ("finish, fifolen(%d)\n", kfifo_len(g_stp_uart_rx_fifo));
}
}
static int __init mtk_wcn_stp_uart_init(void)
{
static struct tty_ldisc_ops stp_uart_ldisc;
int err;
UART_INFO_FUNC("mtk_wcn_stp_uart_init(): MTK STP UART driver\n");
#ifdef LDISC_RX_TASKLET
err = stp_uart_fifo_init();
if (err != 0)
{
return err;
}
/*init rx tasklet*/
tasklet_init(&g_stp_uart_rx_fifo_tasklet, stp_uart_rx_handling, (unsigned long) 0);
#endif
/* Register the tty discipline */
memset(&stp_uart_ldisc, 0, sizeof (stp_uart_ldisc));
stp_uart_ldisc.magic = TTY_LDISC_MAGIC;
stp_uart_ldisc.name = "n_mtkstp";
stp_uart_ldisc.open = stp_uart_tty_open;
stp_uart_ldisc.close = stp_uart_tty_close;
stp_uart_ldisc.read = stp_uart_tty_read;
stp_uart_ldisc.write = stp_uart_tty_write;
stp_uart_ldisc.ioctl = stp_uart_tty_ioctl;
stp_uart_ldisc.poll = stp_uart_tty_poll;
stp_uart_ldisc.receive_buf = stp_uart_tty_receive;
stp_uart_ldisc.write_wakeup = stp_uart_tty_wakeup;
stp_uart_ldisc.owner = THIS_MODULE;
if ((err = tty_register_ldisc(N_MTKSTP, &stp_uart_ldisc)))
{
UART_ERR_FUNC("MTK STP line discipline registration failed. (%d)\n", err);
return err;
}
/*
mtk_wcn_stp_register_if_tx( mtk_wcn_uart_tx);
*/
return 0;
}
/* stp_uart_tty_ioctl()
*
* Process IOCTL system call for the tty device.
*
* Arguments:
*
* tty pointer to tty instance data
* file pointer to open file object for device
* cmd IOCTL command code
* arg argument for IOCTL call (cmd dependent)
*
* Return Value: Command dependent
*/
static int stp_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
UART_LOUD_FUNC("++ ll(%d)\n", tty->low_latency);
switch (cmd) {
case HCIUARTSETPROTO:
#if LDISC_LOW_LATENCY
UART_INFO_FUNC("set low_latency to 1\n");
tty->low_latency = 1;
#endif
break;
default:
UART_LOUD_FUNC("redirect to n_tty_ioctl_helper\n");
err = n_tty_ioctl_helper(tty, file, cmd, arg);
UART_LOUD_FUNC("n_tty_ioctl_helper result(0x%x %d)\n", cmd, err);
break;
};
UART_LOUD_FUNC("--\n");
return err;
}
static inline int stp_uart_tx_wakeup(struct tty_struct *tty)
{
int len = 0;
int written = 0;
int written_count = 0;
static int i = 0;
//unsigned long flags;
// get data from ring buffer
// down(&buf_mtx);
UART_DBG_FUNC("++\n");
//// spin_lock_irqsave(&buf_lock, flags);
#if 0
if((i > 1000) && (i % 5)== 0)
{
UART_INFO_FUNC("i=(%d), ****** drop data from uart******\n", i);
i++;
return 0;
} else {
UART_INFO_FUNC("i=(%d)at stp uart **\n", i);
}
#endif
len = (wr_idx >= rd_idx) ? (wr_idx - rd_idx) : (MTKSTP_BUFFER_SIZE - rd_idx);
if(len > 0 && len < MAX_PACKET_ALLOWED)
{
i++;
/*
* ops->write is called by the kernel to write a series of
* characters to the tty device. The characters may come from
* user space or kernel space. This routine will return the
* number of characters actually accepted for writing.
*/
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
written = tty->ops->write(tty, &tx_buf[rd_idx], len);
if(written != len) {
UART_ERR_FUNC("Error(i-%d):[pid(%d)(%s)]tty-ops->write FAIL!len(%d)wr(%d)wr_i(%d)rd_i(%d)\n\r", i, current->pid, current->comm, len, written, wr_idx, rd_idx);
return -1;
}
written_count = written;
//printk("len = %d, written = %d\n", len, written);
rd_idx = ((rd_idx + written) % MTKSTP_BUFFER_SIZE);
// all data is accepted by UART driver, check again in case roll over
len = (wr_idx >= rd_idx) ? (wr_idx - rd_idx) : (MTKSTP_BUFFER_SIZE - rd_idx);
if(len > 0 && len < MAX_PACKET_ALLOWED)
{
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
written = tty->ops->write(tty, &tx_buf[rd_idx], len);
if (written != len)
{
UART_ERR_FUNC("Error(i-%d):[pid(%d)(%s)]len(%d)wr(%d)wr_i(%d)rd_i(%d)\n\r", i, current->pid, current->comm, len, written, wr_idx, rd_idx);
return -1;
}
rd_idx = ((rd_idx + written) % MTKSTP_BUFFER_SIZE);
written_count += written;
}
else if(len < 0 || len >= MAX_PACKET_ALLOWED)
{
UART_ERR_FUNC("Warnning(i-%d):[pid(%d)(%s)]length verfication(external) warnning,len(%d), wr_idx(%d), rd_idx(%d)!\n\r", i, current->pid, current->comm, len, wr_idx, rd_idx);
return -1;
}
}
else
{
UART_ERR_FUNC("Warnning(i-%d):[pid(%d)(%s)]length verfication(external) warnning,len(%d), wr_idx(%d), rd_idx(%d)!\n\r", i, current->pid, current->comm, len, wr_idx, rd_idx);
return -1;
}
//up(&buf_mtx);
//// spin_unlock_irqrestore(&buf_lock, flags);
UART_DBG_FUNC("--\n");
return written_count;
}
static int mtk_wcn_stp_uart_init(void)
{
static struct tty_ldisc_ops stp_uart_ldisc;
int err;
int fifo_init_done =0;
UART_INFO_FUNC("mtk_wcn_stp_uart_init(): MTK STP UART driver\n");
#if (LDISC_RX == LDISC_RX_TASKLET)
err = stp_uart_fifo_init();
if (err != 0)
{
goto init_err;
}
fifo_init_done = 1;
/*init rx tasklet*/
tasklet_init(&g_stp_uart_rx_fifo_tasklet, stp_uart_rx_handling, (unsigned long) 0);
#elif (LDISC_RX == LDISC_RX_WORK)
err = stp_uart_fifo_init();
if (err != 0) {
UART_ERR_FUNC("stp_uart_fifo_init(WORK) error(%d)\n", err);
err = -EFAULT;
goto init_err;
}
fifo_init_done = 1;
g_stp_uart_rx_work = vmalloc(sizeof(struct work_struct));
if (!g_stp_uart_rx_work) {
UART_ERR_FUNC("vmalloc work_struct(%d) fail\n", sizeof(struct work_struct));
err = -ENOMEM;
goto init_err;
}
g_stp_uart_rx_wq = create_singlethread_workqueue("mtk_urxd");
if (!g_stp_uart_rx_wq) {
UART_ERR_FUNC("create_singlethread_workqueue fail\n");
err = -ENOMEM;
goto init_err;
}
/* init rx work */
INIT_WORK(g_stp_uart_rx_work, stp_uart_rx_worker);
#endif
/* Register the tty discipline */
memset(&stp_uart_ldisc, 0, sizeof (stp_uart_ldisc));
stp_uart_ldisc.magic = TTY_LDISC_MAGIC;
stp_uart_ldisc.name = "n_mtkstp";
stp_uart_ldisc.open = stp_uart_tty_open;
stp_uart_ldisc.close = stp_uart_tty_close;
stp_uart_ldisc.read = stp_uart_tty_read;
stp_uart_ldisc.write = stp_uart_tty_write;
stp_uart_ldisc.ioctl = stp_uart_tty_ioctl;
stp_uart_ldisc.poll = stp_uart_tty_poll;
stp_uart_ldisc.receive_buf = stp_uart_tty_receive;
stp_uart_ldisc.write_wakeup = stp_uart_tty_wakeup;
stp_uart_ldisc.owner = THIS_MODULE;
if ((err = tty_register_ldisc(N_MTKSTP, &stp_uart_ldisc)))
{
UART_ERR_FUNC("MTK STP line discipline registration failed. (%d)\n", err);
goto init_err;
}
/*
mtk_wcn_stp_register_if_tx( mtk_wcn_uart_tx);
*/
return 0;
init_err:
#if (LDISC_RX == LDISC_RX_TASKLET)
/* nothing */
if (fifo_init_done) {
stp_uart_fifo_deinit();
}
#elif (LDISC_RX == LDISC_RX_WORK)
if (g_stp_uart_rx_wq) {
destroy_workqueue(g_stp_uart_rx_wq);
g_stp_uart_rx_wq = NULL;
}
if (g_stp_uart_rx_work) {
vfree(g_stp_uart_rx_work);
}
if (fifo_init_done) {
stp_uart_fifo_deinit();
}
#endif
UART_ERR_FUNC("init fail, return(%d)\n", err);
return err;
}
static int stp_uart_fifo_init(void)
{
int err = 0;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
g_stp_uart_rx_buf = vzalloc(LDISC_RX_BUF_SIZE);
if (!g_stp_uart_rx_buf) {
UART_ERR_FUNC("kfifo_alloc failed (kernel version >= 2.6.37)\n");
err = -4;
goto fifo_init_end;
}
#else
g_stp_uart_rx_buf = vmalloc(LDISC_RX_BUF_SIZE);
if (!g_stp_uart_rx_buf) {
UART_ERR_FUNC("kfifo_alloc failed (kernel version < 2.6.37)\n");
err = -4;
goto fifo_init_end;
}
memset(g_stp_uart_rx_buf, 0, LDISC_RX_BUF_SIZE);
#endif
UART_INFO_FUNC("g_stp_uart_rx_buf alloc ok(0x%p, %d)\n",
g_stp_uart_rx_buf, LDISC_RX_BUF_SIZE);
/*add rx fifo*/
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33))
spin_lock_init(&g_stp_uart_rx_fifo_spinlock);
g_stp_uart_rx_fifo = kfifo_alloc(LDISC_RX_FIFO_SIZE, GFP_KERNEL, &g_stp_uart_rx_fifo_spinlock);
if (NULL == g_stp_uart_rx_fifo) {
UART_ERR_FUNC("kfifo_alloc failed (kernel version < 2.6.33)\n");
err = -1;
goto fifo_init_end;
}
#else
/* allocate struct kfifo first */
g_stp_uart_rx_fifo = kzalloc(sizeof(struct kfifo), GFP_KERNEL);
if (NULL == g_stp_uart_rx_fifo) {
err = -2;
UART_ERR_FUNC("kzalloc struct kfifo failed (kernel version > 2.6.33)\n");
goto fifo_init_end;
}
/* allocate kfifo data buffer then */
err = kfifo_alloc(g_stp_uart_rx_fifo, LDISC_RX_FIFO_SIZE, GFP_KERNEL);
if (0 != err) {
UART_ERR_FUNC("kfifo_alloc failed, err(%d)(kernel version > 2.6.33)\n", err);
kfree(g_stp_uart_rx_fifo);
g_stp_uart_rx_fifo = NULL;
err = -3;
goto fifo_init_end;
}
#endif
UART_INFO_FUNC("g_stp_uart_rx_fifo alloc ok\n");
fifo_init_end:
if (0 == err) {
/* kfifo init ok */
kfifo_reset(g_stp_uart_rx_fifo);
UART_DBG_FUNC("g_stp_uart_rx_fifo init success\n");
}
else {
UART_ERR_FUNC("stp_uart_fifo_init() fail(%d)\n", err);
if (g_stp_uart_rx_buf) {
UART_ERR_FUNC("free g_stp_uart_rx_buf\n");
vfree(g_stp_uart_rx_buf);
g_stp_uart_rx_buf = NULL;
}
}
return err;
}
static INT32 mtk_wcn_uart_tx (
const UINT8 *data,
const UINT32 size,
UINT32 *written_size
)
{
INT32 ret;
int tx_len;
if (unlikely(0 == size)) {
/* special case for STP-CORE, return ASAP. */
if (likely(written_size)) {
*written_size = 0;
}
return 0;
}
UART_LOUD_FUNC("++\n");
/* input sanity checks */
if (unlikely(stp_tty == NULL)) {
UART_ERR_FUNC("NULL stp_tty,pid[%d/%s]\n", current->pid, current->comm);
ret = -1;
goto uart_tx_out;
}
if (unlikely((data == NULL) || (written_size == NULL))) {
UART_ERR_FUNC("NULL data(0x%p) or written(0x%p),pid[%d/%s]\n",
data, written_size, current->pid, current->comm);
ret = -2;
goto uart_tx_out;
}
*written_size = 0;
/* Do size checking. Only 1~MAX_PACKET_ALLOWED-1 is allowed */
if (unlikely(MAX_PACKET_ALLOWED <= size)) {
UART_ERR_FUNC("abnormal size(%d),skip tx,pid[%d/%s]\n",
size, current->pid, current->comm);
dump_stack();
ret = -3;
goto uart_tx_out;
}
#if 0 /* drop data test */
if ((tx_count > 1000) && (tx_count % 5)== 0) {
UART_INFO_FUNC("i=(%d), ****** drop data from uart******\n", i);
++tx_count;
return 0;
}
#endif
tx_len = stp_uart_tty_tx_write(stp_tty, data, size);
if (unlikely(tx_len < 0)) {
UART_WARN_FUNC("stp_uart_tty_tx_write err(%d)\n", tx_len);
*written_size = 0;
ret = -4;
}
else {
*written_size = tx_len;
ret = 0;
}
uart_tx_out:
UART_LOUD_FUNC("--(%d, %d)\n", ret, *written_size);
return ret;
}