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path: root/drivers/tty/serial/stm32-usart.c
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Diffstat (limited to 'drivers/tty/serial/stm32-usart.c')
-rw-r--r--drivers/tty/serial/stm32-usart.c55
1 files changed, 34 insertions, 21 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index b6f4f436a5..e93e3a9b48 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -251,7 +251,9 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter
writel_relaxed(cr3, port->membase + ofs->cr3);
writel_relaxed(cr1, port->membase + ofs->cr1);
- rs485conf->flags |= SER_RS485_RX_DURING_TX;
+ if (!port->rs485_rx_during_tx_gpio)
+ rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
} else {
stm32_usart_clr_bits(port, ofs->cr3,
USART_CR3_DEM | USART_CR3_DEP);
@@ -533,7 +535,7 @@ static void stm32_usart_rx_dma_complete(void *arg)
unsigned int size;
unsigned long flags;
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
size = stm32_usart_receive_chars(port, false);
uart_unlock_and_check_sysrq_irqrestore(port, flags);
if (size)
@@ -639,9 +641,9 @@ static void stm32_usart_tx_dma_complete(void *arg)
stm32_usart_tx_dma_terminate(stm32port);
/* Let's see if we have pending data to send */
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
stm32_usart_transmit_chars(port);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
}
static void stm32_usart_tx_interrupt_enable(struct uart_port *port)
@@ -885,7 +887,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
if (!stm32_port->throttled) {
if (((sr & USART_SR_RXNE) && !stm32_usart_rx_dma_started(stm32_port)) ||
((sr & USART_SR_ERR_MASK) && stm32_usart_rx_dma_started(stm32_port))) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
size = stm32_usart_receive_chars(port, false);
uart_unlock_and_check_sysrq(port);
if (size)
@@ -894,14 +896,14 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
}
if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch)) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
stm32_usart_transmit_chars(port);
- spin_unlock(&port->lock);
+ uart_port_unlock(port);
}
/* Receiver timeout irq for DMA RX */
if (stm32_usart_rx_dma_started(stm32_port) && !stm32_port->throttled) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
size = stm32_usart_receive_chars(port, false);
uart_unlock_and_check_sysrq(port);
if (size)
@@ -989,7 +991,7 @@ static void stm32_usart_throttle(struct uart_port *port)
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
/*
* Pause DMA transfer, so the RX data gets queued into the FIFO.
@@ -1002,7 +1004,7 @@ static void stm32_usart_throttle(struct uart_port *port)
stm32_usart_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
stm32_port->throttled = true;
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
}
/* Unthrottle the remote, the input buffer can now accept data. */
@@ -1012,7 +1014,7 @@ static void stm32_usart_unthrottle(struct uart_port *port)
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
stm32_usart_set_bits(port, ofs->cr1, stm32_port->cr1_irq);
if (stm32_port->cr3_irq)
stm32_usart_set_bits(port, ofs->cr3, stm32_port->cr3_irq);
@@ -1026,7 +1028,7 @@ static void stm32_usart_unthrottle(struct uart_port *port)
if (stm32_port->rx_ch)
stm32_usart_rx_dma_start_or_resume(port);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
}
/* Receive stop */
@@ -1043,9 +1045,20 @@ static void stm32_usart_stop_rx(struct uart_port *port)
stm32_usart_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
}
-/* Handle breaks - ignored by us */
static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
{
+ struct stm32_port *stm32_port = to_stm32_port(port);
+ const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ if (break_state)
+ stm32_usart_set_bits(port, ofs->rqr, USART_RQR_SBKRQ);
+ else
+ stm32_usart_clr_bits(port, ofs->rqr, USART_RQR_SBKRQ);
+
+ spin_unlock_irqrestore(&port->lock, flags);
}
static int stm32_usart_startup(struct uart_port *port)
@@ -1154,7 +1167,7 @@ static void stm32_usart_set_termios(struct uart_port *port,
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 8);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
isr,
@@ -1345,7 +1358,7 @@ static void stm32_usart_set_termios(struct uart_port *port,
writel_relaxed(cr1, port->membase + ofs->cr1);
stm32_usart_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
/* Handle modem control interrupts */
if (UART_ENABLE_MS(port, termios->c_cflag))
@@ -1395,9 +1408,9 @@ static void stm32_usart_pm(struct uart_port *port, unsigned int state,
pm_runtime_get_sync(port->dev);
break;
case UART_PM_STATE_OFF:
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
pm_runtime_put_sync(port->dev);
break;
}
@@ -1880,9 +1893,9 @@ static void stm32_usart_console_write(struct console *co, const char *s,
int locked = 1;
if (oops_in_progress)
- locked = spin_trylock_irqsave(&port->lock, flags);
+ locked = uart_port_trylock_irqsave(port, &flags);
else
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
/* Save and disable interrupts, enable the transmitter */
old_cr1 = readl_relaxed(port->membase + ofs->cr1);
@@ -1896,7 +1909,7 @@ static void stm32_usart_console_write(struct console *co, const char *s,
writel_relaxed(old_cr1, port->membase + ofs->cr1);
if (locked)
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
}
static int stm32_usart_console_setup(struct console *co, char *options)
@@ -2031,7 +2044,7 @@ static int __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port,
* low-power mode.
*/
if (stm32_port->rx_ch) {
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
/* Poll data from DMA RX buffer if any */
if (!stm32_usart_rx_dma_pause(stm32_port))
size += stm32_usart_receive_chars(port, true);