From: Bich Hemon <bich.hemon@xxxxxx>
Signed-off-by: Gerald Baeza <gerald.baeza@xxxxxx>
---
drivers/tty/serial/stm32-usart.c | 25 +++++++++++++++++++------
drivers/tty/serial/stm32-usart.h | 1 +
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index dcc6d1e..ed2025b 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -371,6 +371,10 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
sr = readl_relaxed(port->membase + ofs->isr);
+ if ((sr & USART_SR_RTOF) && (ofs->icr != UNDEF_REG))
+ writel_relaxed(USART_ICR_RTOCF,
+ port->membase + ofs->icr);
+
if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
stm32_receive_chars(port, false);
@@ -453,7 +457,7 @@ static void stm32_throttle(struct uart_port *port)
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_clr_bits(port, ofs->cr1, USART_CR1_RXNEIE);
+ stm32_clr_bits(port, ofs->cr1, stm32_port->rx_irq);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -465,7 +469,7 @@ static void stm32_unthrottle(struct uart_port *port)
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_set_bits(port, ofs->cr1, USART_CR1_RXNEIE);
+ stm32_set_bits(port, ofs->cr1, stm32_port->rx_irq);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -475,7 +479,7 @@ static void stm32_stop_rx(struct uart_port *port)
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
- stm32_clr_bits(port, ofs->cr1, USART_CR1_RXNEIE);
+ stm32_clr_bits(port, ofs->cr1, stm32_port->rx_irq);
}
/* Handle breaks - ignored by us */
@@ -497,7 +501,7 @@ static int stm32_startup(struct uart_port *port)
if (ret)
return ret;
- val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
+ val = stm32_port->rx_irq | USART_CR1_TE | USART_CR1_RE;
if (stm32_port->fifoen)
val |= USART_CR1_FIFOEN;
stm32_set_bits(port, ofs->cr1, val);
@@ -512,7 +516,8 @@ static void stm32_shutdown(struct uart_port *port)
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 val;
- val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
+ val = USART_CR1_TXEIE | USART_CR1_TE;
+ val |= stm32_port->rx_irq | USART_CR1_RE;
val |= BIT(cfg->uart_enable_bit);
if (stm32_port->fifoen)
val |= USART_CR1_FIFOEN;
@@ -543,7 +548,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
/* Stop serial port and reset value */
writel_relaxed(0, port->membase + ofs->cr1);
- cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
+ cr1 = USART_CR1_TE | USART_CR1_RE;
cr1 |= BIT(cfg->uart_enable_bit);
if (stm32_port->fifoen)
cr1 |= USART_CR1_FIFOEN;
@@ -553,6 +558,13 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
if (cflag & CSTOPB)
cr2 |= USART_CR2_STOP_2B;
+ if ((ofs->rtor != UNDEF_REG) && (stm32_port->rx_ch)) {
+ stm32_port->rx_irq = USART_CR1_RTOIE;
+ writel_relaxed(baud, port->membase + ofs->rtor);
+ cr2 |= USART_CR2_RTOEN;
+ }
+ cr1 |= stm32_port->rx_irq;
+
if (cflag & PARENB) {
cr1 |= USART_CR1_PCE;
if ((cflag & CSIZE) == CS8) {
@@ -758,6 +770,7 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
"st,hw-flow-ctrl");
stm32_ports[id].port.line = id;
stm32_ports[id].fifoen = true;
+ stm32_ports[id].rx_irq = USART_CR1_RXNEIE;
return &stm32_ports[id];
}
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index a8999a1..f9fe15b 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -225,6 +225,7 @@ struct stm32_port {
struct dma_chan *tx_ch; /* dma tx channel */
dma_addr_t tx_dma_buf; /* dma tx buffer bus address */
unsigned char *tx_buf; /* dma tx buffer cpu address */
+ u32 rx_irq; /* USART_CR1_RXNEIE or RTOIE */
bool tx_dma_busy; /* dma tx busy */
bool hw_flow_control;
bool fifoen;
--
1.9.1
--
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