/* stp_uart_tty_receive()
*
* Called by tty low level driver when receive data is
* available.
*
* Arguments: tty pointer to tty isntance data
* data pointer to received data
* flags pointer to flags for data
* count count of received data in bytes
*
* Return Value: None
*/
static void stp_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
{
unsigned int written;
//UART_LOUD_FUNC("URX:%d\n", count);
if (unlikely(count > 2000)) {
UART_WARN_FUNC("abnormal: buffer count = %d\n", count);
}
if (unlikely(!g_stp_uart_rx_fifo || !g_stp_uart_rx_work || !g_stp_uart_rx_wq)) {
UART_ERR_FUNC("abnormal g_stp_uart_rx_fifo(0x%p),g_stp_uart_rx_work(0x%p),g_stp_uart_rx_wq(0x%p)\n",
g_stp_uart_rx_fifo, g_stp_uart_rx_work, g_stp_uart_rx_wq);
return;
}
/* need to check available buffer size? skip! */
/* need to lock fifo? skip for single writer single reader! */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33))
written = kfifo_put(g_stp_uart_rx_fifo, (unsigned char *) data, count);
#else
written = kfifo_in(g_stp_uart_rx_fifo, (unsigned char *) data, count);
#endif
//printk("uart_rx:%d,wr:%d\n\r",count,written);
queue_work(g_stp_uart_rx_wq, g_stp_uart_rx_work);
if (unlikely(written != count)) {
UART_ERR_FUNC("c(%d),w(%d) bytes dropped\n", count, written);
}
return;
}
/* stp_uart_tty_receive()
*
* Called by tty low level driver when receive data is
* available.
*
* Arguments: tty pointer to tty isntance data
* data pointer to received data
* flags pointer to flags for data
* count count of received data in bytes
*
* Return Value: None
*/
static void stp_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
{
//UART_INFO_FUNC("count = %d\n", count);
if (count > 2000){
/*this is abnormal*/
UART_WARN_FUNC("count = %d\n", count);
}
#if 0
{
struct timeval now;
do_gettimeofday(&now);
printk("[+STP][ ][R] %4d --> sec = %d, --> usec --> %d\n",
count, now.tv_sec, now.tv_usec);
}
#endif
/*There are multi-context to access here? Need to spinlock?*/
/*Only one context: flush_to_ldisc in tty_buffer.c*/
mtk_wcn_stp_parser_data((UINT8 *)data, (UINT32)count);
/* George Test: useless? */
/*tty_unthrottle(tty);*/
#if 0
{
struct timeval now;
do_gettimeofday(&now);
printk("[-STP][ ][R] %4d --> sec = %d, --> usec --> %d\n",
count, now.tv_sec, now.tv_usec);
}
#endif
return;
}
/* stp_uart_tty_open
*
* Arguments:
* tty pointer to tty info structure
* data pointer to data buffer to be written
* size data buffer length to be written
* Return Value:
* > 0 if success, otherwise error code
*/
static int stp_uart_tty_tx_write (
struct tty_struct *tty,
const UINT8 *data,
const UINT32 size
)
{
int ret;
int len;
int written;
int written_count;
int room;
unsigned old_wr;
unsigned old_rd;
//unsigned long flags;
UART_LOUD_FUNC("++\n");
/* Phase-I: put data into STP-UART ring buffer "tx_buf" */
/* wr_idx : the position next to write
* rd_idx : the position next to read
*/
//down(&buf_mtx);
/* [PatchNeed] spin_lock_irqsave is redundant */
//spin_lock_irqsave(&buf_lock, flags);
old_wr = wr_idx;
old_rd = rd_idx;
/* check left room size */
room = (wr_idx >= rd_idx)
? (STP_UART_TX_BUF_SIZE - (wr_idx - rd_idx) - 1)
: (rd_idx - wr_idx - 1);
UART_DBG_FUNC("before data in:r(%d)s(%d)wr_i(%d)rd_i(%d)\n",
room, size, wr_idx, rd_idx);
if (unlikely(size > room)) {
UART_ERR_FUNC("buf unavailable FAIL#1,size(%d),wr_idx(%d),rd_idx(%d),room(%d),pid[%d/%s]\n",
size, wr_idx, rd_idx, room, current->pid, current->comm);
//up(&buf_mtx);
/* [PatchNeed] spin_lock_irqsave is redundant */
//spin_unlock_irqrestore(&buf_lock, flags);
return -1;
}
else {
len = min(size, STP_UART_TX_BUF_SIZE - (unsigned int)wr_idx);
memcpy(&tx_buf[wr_idx], &data[0], len);
memcpy(&tx_buf[0], &data[len], size - len);
wr_idx = (wr_idx + size) % STP_UART_TX_BUF_SIZE;
UART_DBG_FUNC("after data in: r(%d)s(%d)wr_i(%d)rd_i(%d)\n",
room, size, wr_idx, rd_idx);
}
//up(&buf_mtx);
/* [PatchNeed] spin_lock_irqsave is redundant */
//spin_unlock_irqrestore(&buf_lock, flags);
/* Phase-II: get data from the buffer and send to tty UART.
* May be seperated into another context.
*/
//down(&buf_mtx);
/* [PatchNeed] spin_lock_irqsave is redundant */
//spin_lock_irqsave(&buf_lock, flags);
written_count = 0;
len = (wr_idx >= rd_idx) ? (wr_idx - rd_idx) : (STP_UART_TX_BUF_SIZE - rd_idx);
if (likely(len > 0 && len < MAX_PACKET_ALLOWED))
{
/* TTY_DO_WRITE_WAKEUP is used for "Call write_wakeup after queuing new"
* but stp_uart_tty_wakeup() is empty and unused now!
*/
//set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
/*
* 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.
*/
written = tty->ops->write(tty, &tx_buf[rd_idx], len);
if (written != len) {
UART_ERR_FUNC("tty-ops->write FAIL#2,len(%d)wr(%d)wr_i(%d)rd_i(%d),pid[%d/%s]\n",
len, written, wr_idx, rd_idx, current->pid, current->comm);
ret = -2;
goto tx_write_out_unlock_old;
}
written_count = written;
rd_idx = ((rd_idx + written) % STP_UART_TX_BUF_SIZE);
// all data is accepted by UART driver, check again in case roll over
len = (wr_idx >= rd_idx) ? (wr_idx - rd_idx) : (STP_UART_TX_BUF_SIZE - rd_idx);
if (len > 0 && len < MAX_PACKET_ALLOWED)
{
/* TTY_DO_WRITE_WAKEUP is used for "Call write_wakeup after queuing new"
* but stp_uart_tty_wakeup() is empty and unused now!
*/
//set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
written = tty->ops->write(tty, &tx_buf[rd_idx], len);
if (unlikely(written != len))
{
UART_ERR_FUNC("tty-ops->write FAIL#3,len(%d)wr(%d)wr_i(%d)rd_i(%d),pid[%d/%s]\n",
len, written, wr_idx, rd_idx, current->pid, current->comm);
ret = -3;
goto tx_write_out_unlock_old;
}
rd_idx = ((rd_idx + written) % STP_UART_TX_BUF_SIZE);
written_count += written;
}
else if (unlikely(len < 0 || len >= MAX_PACKET_ALLOWED))
{
UART_ERR_FUNC("FAIL#4,len(%d)wr_i(%d)rd_i(%d),pid[%d/%s]\n",
len, wr_idx, rd_idx,
current->pid, current->comm);
ret = -4;
goto tx_write_out_unlock_old;
}
}
else
{
UART_ERR_FUNC("FAIL#5,len(%d)wr_i(%d)rd_i(%d),pid[%d/%s]\n",
len, wr_idx, rd_idx,
current->pid, current->comm);
ret = -5;
goto tx_write_out_unlock_old;
}
/* success case */
ret = written_count;
tx_write_out_unlock_old:
if (unlikely(ret < 0)) {
//reset read and write index of tx_buffer, is there any risk?
wr_idx = rd_idx = 0;
UART_ERR_FUNC("err(%d)reset fifo idx\n", ret);
}
if (unlikely(wr_idx != rd_idx)) {
UART_WARN_FUNC("--wr(%d)rd(%d)size(%d)old wr(%d)rd(%d)\n",
wr_idx, rd_idx, size, old_wr, old_rd);
}
else {
UART_LOUD_FUNC("--wr(%d) rd(%d)\n", wr_idx, rd_idx);
}
//up(&buf_mtx);
//spin_unlock_irqrestore(&buf_lock, flags);
return ret;
}
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;
}