static void serial_omap_rx_timeout(unsigned long uart_no)
{
struct uart_omap_port *up = ui[uart_no - 1];
unsigned int curr_dma_pos;
curr_dma_pos = omap_readl(OMAP34XX_DMA4_BASE + OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) || (curr_dma_pos == 0)) {
/*
* If there is no transfer rx happening for 10sec then stop the dma
* else just restart the timer. See if 10 sec can be improved.
*/
if (jiffies_to_msecs(jiffies - isr8250_activity) < 10000)
mod_timer(&up->uart_dma.rx_timer, jiffies +
usecs_to_jiffies(up->uart_dma.rx_timeout));
else {
del_timer(&up->uart_dma.rx_timer);
serial_omap_stop_rxdma(up);
up->ier |= UART_IER_RDI;
serial_out(up, UART_IER, up->ier);
}
return;
} else {
unsigned int curr_transmitted_size = curr_dma_pos - up->uart_dma.prev_rx_dma_pos;
up->port.icount.rx += curr_transmitted_size;
tty_insert_flip_string(up->port.state->port.tty, up->uart_dma.rx_buf + (up->uart_dma.prev_rx_dma_pos - up->uart_dma.rx_buf_dma_phys), curr_transmitted_size);
queue_work(omap_serial_workqueue, &up->tty_work);
up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
if (up->uart_dma.rx_buf_size + up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
serial_omap_start_rxdma(up);
} else
mod_timer(&up->uart_dma.rx_timer,
jiffies + usecs_to_jiffies(up->uart_dma.rx_timeout));
isr8250_activity = jiffies;
}
}
static void serial_omap_rxdma_poll(unsigned long uart_no)
{
struct uart_omap_port *up = ui[uart_no];
unsigned int curr_dma_pos, curr_transmitted_size;
int ret = 0;
curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
(curr_dma_pos == 0)) {
if (jiffies_to_msecs(jiffies - up->port_activity) <
up->uart_dma.rx_timeout) {
mod_timer(&up->uart_dma.rx_timer, jiffies +
usecs_to_jiffies(up->uart_dma.rx_poll_rate));
} else {
serial_omap_stop_rxdma(up);
up->ier |= (UART_IER_RDI | UART_IER_RLSI);
serial_out(up, UART_IER, up->ier);
}
return;
}
curr_transmitted_size = curr_dma_pos -
up->uart_dma.prev_rx_dma_pos;
up->port.icount.rx += curr_transmitted_size;
tty_insert_flip_string(up->port.state->port.tty,
up->uart_dma.rx_buf +
(up->uart_dma.prev_rx_dma_pos -
up->uart_dma.rx_buf_dma_phys),
curr_transmitted_size);
tty_flip_buffer_push(up->port.state->port.tty);
up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
if (up->uart_dma.rx_buf_size +
up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
ret = serial_omap_start_rxdma(up);
if (ret < 0) {
serial_omap_stop_rxdma(up);
up->ier |= (UART_IER_RDI | UART_IER_RLSI);
serial_out(up, UART_IER, up->ier);
}
} else {
mod_timer(&up->uart_dma.rx_timer, jiffies +
usecs_to_jiffies(up->uart_dma.rx_poll_rate));
}
up->port_activity = jiffies;
}
static void serial_omap_stop_rx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
serial_omap_stop_rxdma(up);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
}
static void serial_omap_stop_rx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
pm_runtime_get_sync(&up->pdev->dev);
if (up->use_dma)
serial_omap_stop_rxdma(up);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
pm_runtime_mark_last_busy(&up->pdev->dev);
pm_runtime_put_autosuspend(&up->pdev->dev);
}
/**
* are_driver8250_uarts_active() - Check if any ports managed by this
* driver are currently busy. This should be called with interrupts
* disabled.
*/
int are_driveromap_uarts_active(int num)
{
struct circ_buf *xmit;
unsigned int status;
struct uart_omap_port *up = ui[num];
if (!up)
return 0;
/* check ownership of port */
/* Check only ports managed by this driver and open */
if ((up->port.dev == NULL) || (up->port.type == PORT_UNKNOWN))
return 0;
/* driver owns this port but it's closed */
if (up->port.state == NULL)
return 0;
/* check for any current pending activity */
/* Any queued work in ring buffer which can be handled still? */
xmit = &up->port.state->xmit;
if (!(uart_circ_empty(xmit) || uart_tx_stopped(&up->port)))
return 1;
status = serial_in(up, UART_LSR);
/* TX hardware not empty */
if (!(status & (UART_LSR_TEMT | UART_LSR_THRE)))
return 1;
/* Any rx activity? */
if (status & UART_LSR_DR)
return 1;
if (up->use_dma) {
/*
* Silicon Errata i291 workaround.
* UART Module has to be put in force idle if it is
* configured in DMA mode and when there is no activity
* expected.
*/
unsigned int tmp;
del_timer(&up->uart_dma.rx_timer);
serial_omap_stop_rxdma(up);
up->ier |= UART_IER_RDI;
serial_out(up, UART_IER, up->ier);
tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7);
serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
}
return 0;
}
static void serial_omap_stop_rx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
if (up->use_dma)
serial_omap_stop_rxdma(up);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
/*Disable the UART CTS wakeup for UART1,UART2*/
if (!port->suspended)
omap_uart_cts_wakeup(up->pdev->id, 0);
}
static void serial_omap_stop_rx(struct uart_port *port)
{
struct uart_omap_port *up = (struct uart_omap_port *)port;
if (up->use_dma)
serial_omap_stop_rxdma(up);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
/*Disable the UART CTS wakeup for UARTs, Only for UARTs
* Which have the platform Data defined for CTS wake-up
* In the Board File. Else even if this function gets
* called it wont have any impact on the register values
* for MUX configuration.
*/
if (!port->suspended)
omap_uart_cts_wakeup(up->pdev->id, 0);
}
