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serial: stm32x7: add fifo support for STM32H7

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Add fifo mode support for rx and tx.
As only STM32H7 supports this feature, add has_fifo flag
to uart configuration to use fifo only when possible.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrice Chotard 2017-09-27 15:44:51 +02:00 committed by Tom Rini
parent 60a996bacb
commit 2a7ecc5360
2 changed files with 15 additions and 3 deletions
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6
drivers/serial/serial_stm32x7.c
View file

@ -117,6 +117,8 @@ static int stm32_serial_probe(struct udevice *dev)
BIT(uart_enable_bit));
if (plat->uart_info->has_overrun_disable)
setbits_le32(base + CR3_OFFSET(stm32f4), USART_CR3_OVRDIS);
if (plat->uart_info->has_fifo)
setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_FIFOEN);
setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE |
BIT(uart_enable_bit));
@ -125,8 +127,8 @@ static int stm32_serial_probe(struct udevice *dev)
#if CONFIG_IS_ENABLED(OF_CONTROL)
static const struct udevice_id stm32_serial_id[] = {
{ .compatible = "st,stm32f7-uart", .data = (ulong)&stm32x7_info},
{ .compatible = "st,stm32h7-uart", .data = (ulong)&stm32x7_info},
{ .compatible = "st,stm32f7-uart", .data = (ulong)&stm32f7_info},
{ .compatible = "st,stm32h7-uart", .data = (ulong)&stm32h7_info},
{}
};

12
drivers/serial/serial_stm32x7.h
View file

@ -24,12 +24,21 @@ struct stm32_uart_info {
u8 uart_enable_bit; /* UART_CR1_UE */
bool stm32f4; /* true for STM32F4, false otherwise */
bool has_overrun_disable;
bool has_fifo;
};
struct stm32_uart_info stm32x7_info = {
struct stm32_uart_info stm32f7_info = {
.uart_enable_bit = 0,
.stm32f4 = false,
.has_overrun_disable = true,
.has_fifo = false,
};
struct stm32_uart_info stm32h7_info = {
.uart_enable_bit = 0,
.stm32f4 = false,
.has_overrun_disable = true,
.has_fifo = true,
};
/* Information about a serial port */
@ -39,6 +48,7 @@ struct stm32x7_serial_platdata {
unsigned long int clock_rate;
};
#define USART_CR1_FIFOEN BIT(29)
#define USART_CR1_OVER8 BIT(15)
#define USART_CR1_TE BIT(3)
#define USART_CR1_RE BIT(2)