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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.c419
1 files changed, 221 insertions, 198 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index f4de32d3f2af..dde6d526362d 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -3,7 +3,8 @@
* Copyright (C) Maxime Coquelin 2015
* Copyright (C) STMicroelectronics SA 2017
* Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com>
- * Gerald Baeza <gerald.baeza@st.com>
+ * Gerald Baeza <gerald.baeza@foss.st.com>
+ * Erwan Le Ray <erwan.leray@foss.st.com>
*
* Inspired by st-asc.c from STMicroelectronics (c)
*/
@@ -34,15 +35,15 @@
#include "serial_mctrl_gpio.h"
#include "stm32-usart.h"
-static void stm32_stop_tx(struct uart_port *port);
-static void stm32_transmit_chars(struct uart_port *port);
+static void stm32_usart_stop_tx(struct uart_port *port);
+static void stm32_usart_transmit_chars(struct uart_port *port);
static inline struct stm32_port *to_stm32_port(struct uart_port *port)
{
return container_of(port, struct stm32_port, port);
}
-static void stm32_set_bits(struct uart_port *port, u32 reg, u32 bits)
+static void stm32_usart_set_bits(struct uart_port *port, u32 reg, u32 bits)
{
u32 val;
@@ -51,7 +52,7 @@ static void stm32_set_bits(struct uart_port *port, u32 reg, u32 bits)
writel_relaxed(val, port->membase + reg);
}
-static void stm32_clr_bits(struct uart_port *port, u32 reg, u32 bits)
+static void stm32_usart_clr_bits(struct uart_port *port, u32 reg, u32 bits)
{
u32 val;
@@ -60,8 +61,8 @@ static void stm32_clr_bits(struct uart_port *port, u32 reg, u32 bits)
writel_relaxed(val, port->membase + reg);
}
-static void stm32_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
- u32 delay_DDE, u32 baud)
+static void stm32_usart_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
+ u32 delay_DDE, u32 baud)
{
u32 rs485_deat_dedt;
u32 rs485_deat_dedt_max = (USART_CR1_DEAT_MASK >> USART_CR1_DEAT_SHIFT);
@@ -95,8 +96,8 @@ static void stm32_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
*cr1 |= rs485_deat_dedt;
}
-static int stm32_config_rs485(struct uart_port *port,
- struct serial_rs485 *rs485conf)
+static int stm32_usart_config_rs485(struct uart_port *port,
+ struct serial_rs485 *rs485conf)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -104,7 +105,7 @@ static int stm32_config_rs485(struct uart_port *port,
u32 usartdiv, baud, cr1, cr3;
bool over8;
- stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
port->rs485 = *rs485conf;
@@ -122,9 +123,10 @@ static int stm32_config_rs485(struct uart_port *port,
<< USART_BRR_04_R_SHIFT;
baud = DIV_ROUND_CLOSEST(port->uartclk, usartdiv);
- stm32_config_reg_rs485(&cr1, &cr3,
- rs485conf->delay_rts_before_send,
- rs485conf->delay_rts_after_send, baud);
+ stm32_usart_config_reg_rs485(&cr1, &cr3,
+ rs485conf->delay_rts_before_send,
+ rs485conf->delay_rts_after_send,
+ baud);
if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
cr3 &= ~USART_CR3_DEP;
@@ -137,18 +139,19 @@ static int stm32_config_rs485(struct uart_port *port,
writel_relaxed(cr3, port->membase + ofs->cr3);
writel_relaxed(cr1, port->membase + ofs->cr1);
} else {
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DEM | USART_CR3_DEP);
- stm32_clr_bits(port, ofs->cr1,
- USART_CR1_DEDT_MASK | USART_CR1_DEAT_MASK);
+ stm32_usart_clr_bits(port, ofs->cr3,
+ USART_CR3_DEM | USART_CR3_DEP);
+ stm32_usart_clr_bits(port, ofs->cr1,
+ USART_CR1_DEDT_MASK | USART_CR1_DEAT_MASK);
}
- stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
return 0;
}
-static int stm32_init_rs485(struct uart_port *port,
- struct platform_device *pdev)
+static int stm32_usart_init_rs485(struct uart_port *port,
+ struct platform_device *pdev)
{
struct serial_rs485 *rs485conf = &port->rs485;
@@ -162,8 +165,8 @@ static int stm32_init_rs485(struct uart_port *port,
return uart_get_rs485_mode(port);
}
-static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
- bool threaded)
+static int stm32_usart_pending_rx(struct uart_port *port, u32 *sr,
+ int *last_res, bool threaded)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -176,8 +179,7 @@ static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
status = dmaengine_tx_status(stm32_port->rx_ch,
stm32_port->rx_ch->cookie,
&state);
- if ((status == DMA_IN_PROGRESS) &&
- (*last_res != state.residue))
+ if (status == DMA_IN_PROGRESS && (*last_res != state.residue))
return 1;
else
return 0;
@@ -187,8 +189,8 @@ static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
return 0;
}
-static unsigned long stm32_get_char(struct uart_port *port, u32 *sr,
- int *last_res)
+static unsigned long stm32_usart_get_char(struct uart_port *port, u32 *sr,
+ int *last_res)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -207,7 +209,7 @@ static unsigned long stm32_get_char(struct uart_port *port, u32 *sr,
return c;
}
-static void stm32_receive_chars(struct uart_port *port, bool threaded)
+static void stm32_usart_receive_chars(struct uart_port *port, bool threaded)
{
struct tty_port *tport = &port->state->port;
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -219,7 +221,8 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
pm_wakeup_event(tport->tty->dev, 0);
- while (stm32_pending_rx(port, &sr, &stm32_port->last_res, threaded)) {
+ while (stm32_usart_pending_rx(port, &sr, &stm32_port->last_res,
+ threaded)) {
sr |= USART_SR_DUMMY_RX;
flag = TTY_NORMAL;
@@ -238,7 +241,7 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
writel_relaxed(sr & USART_SR_ERR_MASK,
port->membase + ofs->icr);
- c = stm32_get_char(port, &sr, &stm32_port->last_res);
+ c = stm32_usart_get_char(port, &sr, &stm32_port->last_res);
port->icount.rx++;
if (sr & USART_SR_ERR_MASK) {
if (sr & USART_SR_ORE) {
@@ -278,20 +281,20 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
spin_lock(&port->lock);
}
-static void stm32_tx_dma_complete(void *arg)
+static void stm32_usart_tx_dma_complete(void *arg)
{
struct uart_port *port = arg;
struct stm32_port *stm32port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
stm32port->tx_dma_busy = false;
/* Let's see if we have pending data to send */
- stm32_transmit_chars(port);
+ stm32_usart_transmit_chars(port);
}
-static void stm32_tx_interrupt_enable(struct uart_port *port)
+static void stm32_usart_tx_interrupt_enable(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -301,30 +304,30 @@ static void stm32_tx_interrupt_enable(struct uart_port *port)
* or TX empty irq when FIFO is disabled
*/
if (stm32_port->fifoen)
- stm32_set_bits(port, ofs->cr3, USART_CR3_TXFTIE);
+ stm32_usart_set_bits(port, ofs->cr3, USART_CR3_TXFTIE);
else
- stm32_set_bits(port, ofs->cr1, USART_CR1_TXEIE);
+ stm32_usart_set_bits(port, ofs->cr1, USART_CR1_TXEIE);
}
-static void stm32_tx_interrupt_disable(struct uart_port *port)
+static void stm32_usart_tx_interrupt_disable(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
if (stm32_port->fifoen)
- stm32_clr_bits(port, ofs->cr3, USART_CR3_TXFTIE);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_TXFTIE);
else
- stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE);
+ stm32_usart_clr_bits(port, ofs->cr1, USART_CR1_TXEIE);
}
-static void stm32_transmit_chars_pio(struct uart_port *port)
+static void stm32_usart_transmit_chars_pio(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
if (stm32_port->tx_dma_busy) {
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
stm32_port->tx_dma_busy = false;
}
@@ -339,12 +342,12 @@ static void stm32_transmit_chars_pio(struct uart_port *port)
/* rely on TXE irq (mask or unmask) for sending remaining data */
if (uart_circ_empty(xmit))
- stm32_tx_interrupt_disable(port);
+ stm32_usart_tx_interrupt_disable(port);
else
- stm32_tx_interrupt_enable(port);
+ stm32_usart_tx_interrupt_enable(port);
}
-static void stm32_transmit_chars_dma(struct uart_port *port)
+static void stm32_usart_transmit_chars_dma(struct uart_port *port)
{
struct stm32_port *stm32port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
@@ -383,28 +386,34 @@ static void stm32_transmit_chars_dma(struct uart_port *port)
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
- if (!desc) {
- for (i = count; i > 0; i--)
- stm32_transmit_chars_pio(port);
- return;
- }
+ if (!desc)
+ goto fallback_err;
- desc->callback = stm32_tx_dma_complete;
+ desc->callback = stm32_usart_tx_dma_complete;
desc->callback_param = port;
/* Push current DMA TX transaction in the pending queue */
- dmaengine_submit(desc);
+ if (dma_submit_error(dmaengine_submit(desc))) {
+ /* dma no yet started, safe to free resources */
+ dmaengine_terminate_async(stm32port->tx_ch);
+ goto fallback_err;
+ }
/* Issue pending DMA TX requests */
dma_async_issue_pending(stm32port->tx_ch);
- stm32_set_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
port->icount.tx += count;
+ return;
+
+fallback_err:
+ for (i = count; i > 0; i--)
+ stm32_usart_transmit_chars_pio(port);
}
-static void stm32_transmit_chars(struct uart_port *port)
+static void stm32_usart_transmit_chars(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -412,38 +421,38 @@ static void stm32_transmit_chars(struct uart_port *port)
if (port->x_char) {
if (stm32_port->tx_dma_busy)
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
writel_relaxed(port->x_char, port->membase + ofs->tdr);
port->x_char = 0;
port->icount.tx++;
if (stm32_port->tx_dma_busy)
- stm32_set_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT);
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- stm32_tx_interrupt_disable(port);
+ stm32_usart_tx_interrupt_disable(port);
return;
}
if (ofs->icr == UNDEF_REG)
- stm32_clr_bits(port, ofs->isr, USART_SR_TC);
+ stm32_usart_clr_bits(port, ofs->isr, USART_SR_TC);
else
writel_relaxed(USART_ICR_TCCF, port->membase + ofs->icr);
if (stm32_port->tx_ch)
- stm32_transmit_chars_dma(port);
+ stm32_usart_transmit_chars_dma(port);
else
- stm32_transmit_chars_pio(port);
+ stm32_usart_transmit_chars_pio(port);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
- stm32_tx_interrupt_disable(port);
+ stm32_usart_tx_interrupt_disable(port);
}
-static irqreturn_t stm32_interrupt(int irq, void *ptr)
+static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -458,15 +467,15 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
writel_relaxed(USART_ICR_RTOCF,
port->membase + ofs->icr);
- if ((sr & USART_SR_WUF) && (ofs->icr != UNDEF_REG))
+ if ((sr & USART_SR_WUF) && ofs->icr != UNDEF_REG)
writel_relaxed(USART_ICR_WUCF,
port->membase + ofs->icr);
if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
- stm32_receive_chars(port, false);
+ stm32_usart_receive_chars(port, false);
if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch))
- stm32_transmit_chars(port);
+ stm32_usart_transmit_chars(port);
spin_unlock(&port->lock);
@@ -476,7 +485,7 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
return IRQ_HANDLED;
}
-static irqreturn_t stm32_threaded_interrupt(int irq, void *ptr)
+static irqreturn_t stm32_usart_threaded_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -484,14 +493,14 @@ static irqreturn_t stm32_threaded_interrupt(int irq, void *ptr)
spin_lock(&port->lock);
if (stm32_port->rx_ch)
- stm32_receive_chars(port, true);
+ stm32_usart_receive_chars(port, true);
spin_unlock(&port->lock);
return IRQ_HANDLED;
}
-static unsigned int stm32_tx_empty(struct uart_port *port)
+static unsigned int stm32_usart_tx_empty(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -499,20 +508,20 @@ static unsigned int stm32_tx_empty(struct uart_port *port)
return readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE;
}
-static void stm32_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void stm32_usart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
- stm32_set_bits(port, ofs->cr3, USART_CR3_RTSE);
+ stm32_usart_set_bits(port, ofs->cr3, USART_CR3_RTSE);
else
- stm32_clr_bits(port, ofs->cr3, USART_CR3_RTSE);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_RTSE);
mctrl_gpio_set(stm32_port->gpios, mctrl);
}
-static unsigned int stm32_get_mctrl(struct uart_port *port)
+static unsigned int stm32_usart_get_mctrl(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
unsigned int ret;
@@ -523,23 +532,23 @@ static unsigned int stm32_get_mctrl(struct uart_port *port)
return mctrl_gpio_get(stm32_port->gpios, &ret);
}
-static void stm32_enable_ms(struct uart_port *port)
+static void stm32_usart_enable_ms(struct uart_port *port)
{
mctrl_gpio_enable_ms(to_stm32_port(port)->gpios);
}
-static void stm32_disable_ms(struct uart_port *port)
+static void stm32_usart_disable_ms(struct uart_port *port)
{
mctrl_gpio_disable_ms(to_stm32_port(port)->gpios);
}
/* Transmit stop */
-static void stm32_stop_tx(struct uart_port *port)
+static void stm32_usart_stop_tx(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct serial_rs485 *rs485conf = &port->rs485;
- stm32_tx_interrupt_disable(port);
+ stm32_usart_tx_interrupt_disable(port);
if (rs485conf->flags & SER_RS485_ENABLED) {
if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
@@ -553,7 +562,7 @@ static void stm32_stop_tx(struct uart_port *port)
}
/* There are probably characters waiting to be transmitted. */
-static void stm32_start_tx(struct uart_port *port)
+static void stm32_usart_start_tx(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct serial_rs485 *rs485conf = &port->rs485;
@@ -572,57 +581,56 @@ static void stm32_start_tx(struct uart_port *port)
}
}
- stm32_transmit_chars(port);
+ stm32_usart_transmit_chars(port);
}
/* Throttle the remote when input buffer is about to overflow. */
-static void stm32_throttle(struct uart_port *port)
+static void stm32_usart_throttle(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_clr_bits(port, ofs->cr1, stm32_port->cr1_irq);
+ stm32_usart_clr_bits(port, ofs->cr1, stm32_port->cr1_irq);
if (stm32_port->cr3_irq)
- stm32_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
+ stm32_usart_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
spin_unlock_irqrestore(&port->lock, flags);
}
/* Unthrottle the remote, the input buffer can now accept data. */
-static void stm32_unthrottle(struct uart_port *port)
+static void stm32_usart_unthrottle(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- stm32_set_bits(port, ofs->cr1, stm32_port->cr1_irq);
+ stm32_usart_set_bits(port, ofs->cr1, stm32_port->cr1_irq);
if (stm32_port->cr3_irq)
- stm32_set_bits(port, ofs->cr3, stm32_port->cr3_irq);
+ stm32_usart_set_bits(port, ofs->cr3, stm32_port->cr3_irq);
spin_unlock_irqrestore(&port->lock, flags);
}
/* Receive stop */
-static void stm32_stop_rx(struct uart_port *port)
+static void stm32_usart_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, stm32_port->cr1_irq);
+ stm32_usart_clr_bits(port, ofs->cr1, stm32_port->cr1_irq);
if (stm32_port->cr3_irq)
- stm32_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
-
+ stm32_usart_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
}
/* Handle breaks - ignored by us */
-static void stm32_break_ctl(struct uart_port *port, int break_state)
+static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
{
}
-static int stm32_startup(struct uart_port *port)
+static int stm32_usart_startup(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -630,15 +638,15 @@ static int stm32_startup(struct uart_port *port)
u32 val;
int ret;
- ret = request_threaded_irq(port->irq, stm32_interrupt,
- stm32_threaded_interrupt,
+ ret = request_threaded_irq(port->irq, stm32_usart_interrupt,
+ stm32_usart_threaded_interrupt,
IRQF_NO_SUSPEND, name, port);
if (ret)
return ret;
/* RX FIFO Flush */
if (ofs->rqr != UNDEF_REG)
- stm32_set_bits(port, ofs->rqr, USART_RQR_RXFRQ);
+ stm32_usart_set_bits(port, ofs->rqr, USART_RQR_RXFRQ);
/* Tx and RX FIFO configuration */
if (stm32_port->fifoen) {
@@ -653,12 +661,12 @@ static int stm32_startup(struct uart_port *port)
val = stm32_port->cr1_irq | USART_CR1_RE;
if (stm32_port->fifoen)
val |= USART_CR1_FIFOEN;
- stm32_set_bits(port, ofs->cr1, val);
+ stm32_usart_set_bits(port, ofs->cr1, val);
return 0;
}
-static void stm32_shutdown(struct uart_port *port)
+static void stm32_usart_shutdown(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -667,7 +675,7 @@ static void stm32_shutdown(struct uart_port *port)
int ret;
/* Disable modem control interrupts */
- stm32_disable_ms(port);
+ stm32_usart_disable_ms(port);
val = USART_CR1_TXEIE | USART_CR1_TE;
val |= stm32_port->cr1_irq | USART_CR1_RE;
@@ -679,15 +687,16 @@ static void stm32_shutdown(struct uart_port *port)
isr, (isr & USART_SR_TC),
10, 100000);
+ /* Send the TC error message only when ISR_TC is not set */
if (ret)
- dev_err(port->dev, "transmission complete not set\n");
+ dev_err(port->dev, "Transmission is not complete\n");
- stm32_clr_bits(port, ofs->cr1, val);
+ stm32_usart_clr_bits(port, ofs->cr1, val);
free_irq(port->irq, port);
}
-static unsigned int stm32_get_databits(struct ktermios *termios)
+static unsigned int stm32_usart_get_databits(struct ktermios *termios)
{
unsigned int bits;
@@ -717,8 +726,9 @@ static unsigned int stm32_get_databits(struct ktermios *termios)
return bits;
}
-static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
+static void stm32_usart_set_termios(struct uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -742,8 +752,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
/* flush RX & TX FIFO */
if (ofs->rqr != UNDEF_REG)
- stm32_set_bits(port, ofs->rqr,
- USART_RQR_TXFRQ | USART_RQR_RXFRQ);
+ stm32_usart_set_bits(port, ofs->rqr,
+ USART_RQR_TXFRQ | USART_RQR_RXFRQ);
cr1 = USART_CR1_TE | USART_CR1_RE;
if (stm32_port->fifoen)
@@ -756,7 +766,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
if (cflag & CSTOPB)
cr2 |= USART_CR2_STOP_2B;
- bits = stm32_get_databits(termios);
+ bits = stm32_usart_get_databits(termios);
stm32_port->rdr_mask = (BIT(bits) - 1);
if (cflag & PARENB) {
@@ -809,9 +819,9 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
/* Handle modem control interrupts */
if (UART_ENABLE_MS(port, termios->c_cflag))
- stm32_enable_ms(port);
+ stm32_usart_enable_ms(port);
else
- stm32_disable_ms(port);
+ stm32_usart_disable_ms(port);
usartdiv = DIV_ROUND_CLOSEST(port->uartclk, baud);
@@ -824,11 +834,11 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
if (usartdiv < 16) {
oversampling = 8;
cr1 |= USART_CR1_OVER8;
- stm32_set_bits(port, ofs->cr1, USART_CR1_OVER8);
+ stm32_usart_set_bits(port, ofs->cr1, USART_CR1_OVER8);
} else {
oversampling = 16;
cr1 &= ~USART_CR1_OVER8;
- stm32_clr_bits(port, ofs->cr1, USART_CR1_OVER8);
+ stm32_usart_clr_bits(port, ofs->cr1, USART_CR1_OVER8);
}
mantissa = (usartdiv / oversampling) << USART_BRR_DIV_M_SHIFT;
@@ -865,9 +875,10 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
cr3 |= USART_CR3_DMAR;
if (rs485conf->flags & SER_RS485_ENABLED) {
- stm32_config_reg_rs485(&cr1, &cr3,
- rs485conf->delay_rts_before_send,
- rs485conf->delay_rts_after_send, baud);
+ stm32_usart_config_reg_rs485(&cr1, &cr3,
+ rs485conf->delay_rts_before_send,
+ rs485conf->delay_rts_after_send,
+ baud);
if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
cr3 &= ~USART_CR3_DEP;
rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND;
@@ -885,39 +896,39 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
writel_relaxed(cr2, port->membase + ofs->cr2);
writel_relaxed(cr1, port->membase + ofs->cr1);
- stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
spin_unlock_irqrestore(&port->lock, flags);
}
-static const char *stm32_type(struct uart_port *port)
+static const char *stm32_usart_type(struct uart_port *port)
{
return (port->type == PORT_STM32) ? DRIVER_NAME : NULL;
}
-static void stm32_release_port(struct uart_port *port)
+static void stm32_usart_release_port(struct uart_port *port)
{
}
-static int stm32_request_port(struct uart_port *port)
+static int stm32_usart_request_port(struct uart_port *port)
{
return 0;
}
-static void stm32_config_port(struct uart_port *port, int flags)
+static void stm32_usart_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE)
port->type = PORT_STM32;
}
static int
-stm32_verify_port(struct uart_port *port, struct serial_struct *ser)
+stm32_usart_verify_port(struct uart_port *port, struct serial_struct *ser)
{
/* No user changeable parameters */
return -EINVAL;
}
-static void stm32_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
+static void stm32_usart_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
{
struct stm32_port *stm32port = container_of(port,
struct stm32_port, port);
@@ -931,7 +942,7 @@ static void stm32_pm(struct uart_port *port, unsigned int state,
break;
case UART_PM_STATE_OFF:
spin_lock_irqsave(&port->lock, flags);
- stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
spin_unlock_irqrestore(&port->lock, flags);
pm_runtime_put_sync(port->dev);
break;
@@ -939,33 +950,42 @@ static void stm32_pm(struct uart_port *port, unsigned int state,
}
static const struct uart_ops stm32_uart_ops = {
- .tx_empty = stm32_tx_empty,
- .set_mctrl = stm32_set_mctrl,
- .get_mctrl = stm32_get_mctrl,
- .stop_tx = stm32_stop_tx,
- .start_tx = stm32_start_tx,
- .throttle = stm32_throttle,
- .unthrottle = stm32_unthrottle,
- .stop_rx = stm32_stop_rx,
- .enable_ms = stm32_enable_ms,
- .break_ctl = stm32_break_ctl,
- .startup = stm32_startup,
- .shutdown = stm32_shutdown,
- .set_termios = stm32_set_termios,
- .pm = stm32_pm,
- .type = stm32_type,
- .release_port = stm32_release_port,
- .request_port = stm32_request_port,
- .config_port = stm32_config_port,
- .verify_port = stm32_verify_port,
+ .tx_empty = stm32_usart_tx_empty,
+ .set_mctrl = stm32_usart_set_mctrl,
+ .get_mctrl = stm32_usart_get_mctrl,
+ .stop_tx = stm32_usart_stop_tx,
+ .start_tx = stm32_usart_start_tx,
+ .throttle = stm32_usart_throttle,
+ .unthrottle = stm32_usart_unthrottle,
+ .stop_rx = stm32_usart_stop_rx,
+ .enable_ms = stm32_usart_enable_ms,
+ .break_ctl = stm32_usart_break_ctl,
+ .startup = stm32_usart_startup,
+ .shutdown = stm32_usart_shutdown,
+ .set_termios = stm32_usart_set_termios,
+ .pm = stm32_usart_pm,
+ .type = stm32_usart_type,
+ .release_port = stm32_usart_release_port,
+ .request_port = stm32_usart_request_port,
+ .config_port = stm32_usart_config_port,
+ .verify_port = stm32_usart_verify_port,
};
-static int stm32_init_port(struct stm32_port *stm32port,
- struct platform_device *pdev)
+static void stm32_usart_deinit_port(struct stm32_port *stm32port)
+{
+ clk_disable_unprepare(stm32port->clk);
+}
+
+static int stm32_usart_init_port(struct stm32_port *stm32port,
+ struct platform_device *pdev)
{
struct uart_port *port = &stm32port->port;
struct resource *res;
- int ret;
+ int ret, irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0)
+ return irq ? : -ENODEV;
port->iotype = UPIO_MEM;
port->flags = UPF_BOOT_AUTOCONF;
@@ -973,15 +993,10 @@ static int stm32_init_port(struct stm32_port *stm32port,
port->dev = &pdev->dev;
port->fifosize = stm32port->info->cfg.fifosize;
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_STM32_CONSOLE);
+ port->irq = irq;
+ port->rs485_config = stm32_usart_config_rs485;
- ret = platform_get_irq(pdev, 0);
- if (ret <= 0)
- return ret ? : -ENODEV;
- port->irq = ret;
-
- port->rs485_config = stm32_config_rs485;
-
- ret = stm32_init_rs485(port, pdev);
+ ret = stm32_usart_init_rs485(port, pdev);
if (ret)
return ret;
@@ -1022,7 +1037,10 @@ static int stm32_init_port(struct stm32_port *stm32port,
goto err_clk;
}
- /* Both CTS/RTS gpios and "st,hw-flow-ctrl" should not be specified */
+ /*
+ * Both CTS/RTS gpios and "st,hw-flow-ctrl" (deprecated) or "uart-has-rtscts"
+ * properties should not be specified.
+ */
if (stm32port->hw_flow_control) {
if (mctrl_gpio_to_gpiod(stm32port->gpios, UART_GPIO_CTS) ||
mctrl_gpio_to_gpiod(stm32port->gpios, UART_GPIO_RTS)) {
@@ -1040,7 +1058,7 @@ err_clk:
return ret;
}
-static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
+static struct stm32_port *stm32_usart_of_get_port(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int id;
@@ -1078,8 +1096,8 @@ static const struct of_device_id stm32_match[] = {
MODULE_DEVICE_TABLE(of, stm32_match);
#endif
-static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
- struct platform_device *pdev)
+static int stm32_usart_of_dma_rx_probe(struct stm32_port *stm32port,
+ struct platform_device *pdev)
{
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct uart_port *port = &stm32port->port;
@@ -1095,8 +1113,8 @@ static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
return -ENODEV;
}
stm32port->rx_buf = dma_alloc_coherent(&pdev->dev, RX_BUF_L,
- &stm32port->rx_dma_buf,
- GFP_KERNEL);
+ &stm32port->rx_dma_buf,
+ GFP_KERNEL);
if (!stm32port->rx_buf) {
ret = -ENOMEM;
goto alloc_err;
@@ -1130,7 +1148,11 @@ static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
desc->callback_param = NULL;
/* Push current DMA transaction in the pending queue */
- dmaengine_submit(desc);
+ ret = dma_submit_error(dmaengine_submit(desc));
+ if (ret) {
+ dmaengine_terminate_sync(stm32port->rx_ch);
+ goto config_err;
+ }
/* Issue pending DMA requests */
dma_async_issue_pending(stm32port->rx_ch);
@@ -1149,8 +1171,8 @@ alloc_err:
return ret;
}
-static int stm32_of_dma_tx_probe(struct stm32_port *stm32port,
- struct platform_device *pdev)
+static int stm32_usart_of_dma_tx_probe(struct stm32_port *stm32port,
+ struct platform_device *pdev)
{
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct uart_port *port = &stm32port->port;
@@ -1167,8 +1189,8 @@ static int stm32_of_dma_tx_probe(struct stm32_port *stm32port,
return -ENODEV;
}
stm32port->tx_buf = dma_alloc_coherent(&pdev->dev, TX_BUF_L,
- &stm32port->tx_dma_buf,
- GFP_KERNEL);
+ &stm32port->tx_dma_buf,
+ GFP_KERNEL);
if (!stm32port->tx_buf) {
ret = -ENOMEM;
goto alloc_err;
@@ -1200,13 +1222,13 @@ alloc_err:
return ret;
}
-static int stm32_serial_probe(struct platform_device *pdev)
+static int stm32_usart_serial_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct stm32_port *stm32port;
int ret;
- stm32port = stm32_of_get_stm32_port(pdev);
+ stm32port = stm32_usart_of_get_port(pdev);
if (!stm32port)
return -ENODEV;
@@ -1216,7 +1238,7 @@ static int stm32_serial_probe(struct platform_device *pdev)
else
return -EINVAL;
- ret = stm32_init_port(stm32port, pdev);
+ ret = stm32_usart_init_port(stm32port, pdev);
if (ret)
return ret;
@@ -1237,11 +1259,11 @@ static int stm32_serial_probe(struct platform_device *pdev)
if (ret)
goto err_wirq;
- ret = stm32_of_dma_rx_probe(stm32port, pdev);
+ ret = stm32_usart_of_dma_rx_probe(stm32port, pdev);
if (ret)
dev_info(&pdev->dev, "interrupt mode used for rx (no dma)\n");
- ret = stm32_of_dma_tx_probe(stm32port, pdev);
+ ret = stm32_usart_of_dma_tx_probe(stm32port, pdev);
if (ret)
dev_info(&pdev->dev, "interrupt mode used for tx (no dma)\n");
@@ -1263,12 +1285,12 @@ err_nowup:
device_init_wakeup(&pdev->dev, false);
err_uninit:
- clk_disable_unprepare(stm32port->clk);
+ stm32_usart_deinit_port(stm32port);
return ret;
}
-static int stm32_serial_remove(struct platform_device *pdev)
+static int stm32_usart_serial_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -1277,7 +1299,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
pm_runtime_get_sync(&pdev->dev);
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAR);
if (stm32_port->rx_ch)
dma_release_channel(stm32_port->rx_ch);
@@ -1287,7 +1309,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
RX_BUF_L, stm32_port->rx_buf,
stm32_port->rx_dma_buf);
- stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
if (stm32_port->tx_ch)
dma_release_channel(stm32_port->tx_ch);
@@ -1302,7 +1324,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, false);
}
- clk_disable_unprepare(stm32_port->clk);
+ stm32_usart_deinit_port(stm32_port);
err = uart_remove_one_port(&stm32_usart_driver, port);
@@ -1312,9 +1334,8 @@ static int stm32_serial_remove(struct platform_device *pdev)
return err;
}
-
#ifdef CONFIG_SERIAL_STM32_CONSOLE
-static void stm32_console_putchar(struct uart_port *port, int ch)
+static void stm32_usart_console_putchar(struct uart_port *port, int ch)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -1325,7 +1346,8 @@ static void stm32_console_putchar(struct uart_port *port, int ch)
writel_relaxed(ch, port->membase + ofs->tdr);
}
-static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
+static void stm32_usart_console_write(struct console *co, const char *s,
+ unsigned int cnt)
{
struct uart_port *port = &stm32_ports[co->index].port;
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -1349,7 +1371,7 @@ static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
new_cr1 |= USART_CR1_TE | BIT(cfg->uart_enable_bit);
writel_relaxed(new_cr1, port->membase + ofs->cr1);
- uart_console_write(port, s, cnt, stm32_console_putchar);
+ uart_console_write(port, s, cnt, stm32_usart_console_putchar);
/* Restore interrupt state */
writel_relaxed(old_cr1, port->membase + ofs->cr1);
@@ -1359,7 +1381,7 @@ static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
local_irq_restore(flags);
}
-static int stm32_console_setup(struct console *co, char *options)
+static int stm32_usart_console_setup(struct console *co, char *options)
{
struct stm32_port *stm32port;
int baud = 9600;
@@ -1378,7 +1400,7 @@ static int stm32_console_setup(struct console *co, char *options)
* this to be called during the uart port registration when the
* driver gets probed and the port should be mapped at that point.
*/
- if (stm32port->port.mapbase == 0 || stm32port->port.membase == NULL)
+ if (stm32port->port.mapbase == 0 || !stm32port->port.membase)
return -ENXIO;
if (options)
@@ -1390,8 +1412,8 @@ static int stm32_console_setup(struct console *co, char *options)
static struct console stm32_console = {
.name = STM32_SERIAL_NAME,
.device = uart_console_device,
- .write = stm32_console_write,
- .setup = stm32_console_setup,
+ .write = stm32_usart_console_write,
+ .setup = stm32_usart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &stm32_usart_driver,
@@ -1412,8 +1434,8 @@ static struct uart_driver stm32_usart_driver = {
.cons = STM32_SERIAL_CONSOLE,
};
-static void __maybe_unused stm32_serial_enable_wakeup(struct uart_port *port,
- bool enable)
+static void __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port,
+ bool enable)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -1424,29 +1446,29 @@ static void __maybe_unused stm32_serial_enable_wakeup(struct uart_port *port,
return;
if (enable) {
- stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- stm32_set_bits(port, ofs->cr1, USART_CR1_UESM);
+ stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_set_bits(port, ofs->cr1, USART_CR1_UESM);
val = readl_relaxed(port->membase + ofs->cr3);
val &= ~USART_CR3_WUS_MASK;
/* Enable Wake up interrupt from low power on start bit */
val |= USART_CR3_WUS_START_BIT | USART_CR3_WUFIE;
writel_relaxed(val, port->membase + ofs->cr3);
- stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+ stm32_usart_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
} else {
- stm32_clr_bits(port, ofs->cr1, USART_CR1_UESM);
+ stm32_usart_clr_bits(port, ofs->cr1, USART_CR1_UESM);
}
}
-static int __maybe_unused stm32_serial_suspend(struct device *dev)
+static int __maybe_unused stm32_usart_serial_suspend(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
uart_suspend_port(&stm32_usart_driver, port);
if (device_may_wakeup(dev))
- stm32_serial_enable_wakeup(port, true);
+ stm32_usart_serial_en_wakeup(port, true);
else
- stm32_serial_enable_wakeup(port, false);
+ stm32_usart_serial_en_wakeup(port, false);
/*
* When "no_console_suspend" is enabled, keep the pinctrl default state
@@ -1464,19 +1486,19 @@ static int __maybe_unused stm32_serial_suspend(struct device *dev)
return 0;
}
-static int __maybe_unused stm32_serial_resume(struct device *dev)
+static int __maybe_unused stm32_usart_serial_resume(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
pinctrl_pm_select_default_state(dev);
if (device_may_wakeup(dev))
- stm32_serial_enable_wakeup(port, false);
+ stm32_usart_serial_en_wakeup(port, false);
return uart_resume_port(&stm32_usart_driver, port);
}
-static int __maybe_unused stm32_serial_runtime_suspend(struct device *dev)
+static int __maybe_unused stm32_usart_runtime_suspend(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
struct stm32_port *stm32port = container_of(port,
@@ -1487,7 +1509,7 @@ static int __maybe_unused stm32_serial_runtime_suspend(struct device *dev)
return 0;
}
-static int __maybe_unused stm32_serial_runtime_resume(struct device *dev)
+static int __maybe_unused stm32_usart_runtime_resume(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
struct stm32_port *stm32port = container_of(port,
@@ -1497,14 +1519,15 @@ static int __maybe_unused stm32_serial_runtime_resume(struct device *dev)
}
static const struct dev_pm_ops stm32_serial_pm_ops = {
- SET_RUNTIME_PM_OPS(stm32_serial_runtime_suspend,
- stm32_serial_runtime_resume, NULL)
- SET_SYSTEM_SLEEP_PM_OPS(stm32_serial_suspend, stm32_serial_resume)
+ SET_RUNTIME_PM_OPS(stm32_usart_runtime_suspend,
+ stm32_usart_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(stm32_usart_serial_suspend,
+ stm32_usart_serial_resume)
};
static struct platform_driver stm32_serial_driver = {
- .probe = stm32_serial_probe,
- .remove = stm32_serial_remove,
+ .probe = stm32_usart_serial_probe,
+ .remove = stm32_usart_serial_remove,
.driver = {
.name = DRIVER_NAME,
.pm = &stm32_serial_pm_ops,
@@ -1512,7 +1535,7 @@ static struct platform_driver stm32_serial_driver = {
},
};
-static int __init usart_init(void)
+static int __init stm32_usart_init(void)
{
static char banner[] __initdata = "STM32 USART driver initialized";
int ret;
@@ -1530,14 +1553,14 @@ static int __init usart_init(void)
return ret;
}
-static void __exit usart_exit(void)
+static void __exit stm32_usart_exit(void)
{
platform_driver_unregister(&stm32_serial_driver);
uart_unregister_driver(&stm32_usart_driver);
}
-module_init(usart_init);
-module_exit(usart_exit);
+module_init(stm32_usart_init);
+module_exit(stm32_usart_exit);
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_DESCRIPTION("STMicroelectronics STM32 serial port driver");
generated by cgit (git 2.34.1) at 2024-06-06 16:25:57 +0000