diff options
Diffstat (limited to 'drivers/serial/serial_stm32.c')
| -rw-r--r-- | drivers/serial/serial_stm32.c | 71 |
1 files changed, 59 insertions, 12 deletions
diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c index 8c613db95d..8b2830b946 100644 --- a/drivers/serial/serial_stm32.c +++ b/drivers/serial/serial_stm32.c @@ -10,11 +10,34 @@ #include <serial.h> #include <asm/arch/stm32.h> +/* + * Set up the usart port + */ +#if (CONFIG_STM32_USART >= 1) && (CONFIG_STM32_USART <= 6) +#define USART_PORT (CONFIG_STM32_USART - 1) +#else +#define USART_PORT 0 +#endif +/* + * Set up the usart base address + * + * --STM32_USARTD_BASE means default setting + */ #define STM32_USART1_BASE (STM32_APB2PERIPH_BASE + 0x1000) -#define RCC_APB2ENR_USART1EN (1 << 4) - -#define USART_BASE STM32_USART1_BASE -#define RCC_USART_ENABLE RCC_APB2ENR_USART1EN +#define STM32_USART2_BASE (STM32_APB1PERIPH_BASE + 0x4400) +#define STM32_USART3_BASE (STM32_APB1PERIPH_BASE + 0x4800) +#define STM32_USART6_BASE (STM32_APB2PERIPH_BASE + 0x1400) +#define STM32_USARTD_BASE STM32_USART1_BASE +/* + * RCC USART specific definitions + * + * --RCC_ENR_USARTDEN means default setting + */ +#define RCC_ENR_USART1EN (1 << 4) +#define RCC_ENR_USART2EN (1 << 17) +#define RCC_ENR_USART3EN (1 << 18) +#define RCC_ENR_USART6EN (1 << 5) +#define RCC_ENR_USARTDEN RCC_ENR_USART1EN struct stm32_serial { u32 sr; @@ -39,6 +62,24 @@ struct stm32_serial { DECLARE_GLOBAL_DATA_PTR; +static const unsigned long usart_base[] = { + STM32_USART1_BASE, + STM32_USART2_BASE, + STM32_USART3_BASE, + STM32_USARTD_BASE, + STM32_USARTD_BASE, + STM32_USART6_BASE +}; + +static const unsigned long rcc_enr_en[] = { + RCC_ENR_USART1EN, + RCC_ENR_USART2EN, + RCC_ENR_USART3EN, + RCC_ENR_USARTDEN, + RCC_ENR_USARTDEN, + RCC_ENR_USART6EN +}; + static void stm32_serial_setbrg(void) { serial_init(); @@ -46,14 +87,17 @@ static void stm32_serial_setbrg(void) static int stm32_serial_init(void) { - struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + struct stm32_serial *usart = + (struct stm32_serial *)usart_base[USART_PORT]; u32 clock, int_div, frac_div, tmp; - if ((USART_BASE & STM32_BUS_MASK) == STM32_APB1PERIPH_BASE) { - setbits_le32(&STM32_RCC->apb1enr, RCC_USART_ENABLE); + if ((usart_base[USART_PORT] & STM32_BUS_MASK) == + STM32_APB1PERIPH_BASE) { + setbits_le32(&STM32_RCC->apb1enr, rcc_enr_en[USART_PORT]); clock = clock_get(CLOCK_APB1); - } else if ((USART_BASE & STM32_BUS_MASK) == STM32_APB2PERIPH_BASE) { - setbits_le32(&STM32_RCC->apb2enr, RCC_USART_ENABLE); + } else if ((usart_base[USART_PORT] & STM32_BUS_MASK) == + STM32_APB2PERIPH_BASE) { + setbits_le32(&STM32_RCC->apb2enr, rcc_enr_en[USART_PORT]); clock = clock_get(CLOCK_APB2); } else { return -1; @@ -72,7 +116,8 @@ static int stm32_serial_init(void) static int stm32_serial_getc(void) { - struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + struct stm32_serial *usart = + (struct stm32_serial *)usart_base[USART_PORT]; while ((readl(&usart->sr) & USART_SR_FLAG_RXNE) == 0) ; return readl(&usart->dr); @@ -80,7 +125,8 @@ static int stm32_serial_getc(void) static void stm32_serial_putc(const char c) { - struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + struct stm32_serial *usart = + (struct stm32_serial *)usart_base[USART_PORT]; if (c == '\n') stm32_serial_putc('\r'); @@ -92,7 +138,8 @@ static void stm32_serial_putc(const char c) static int stm32_serial_tstc(void) { - struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + struct stm32_serial *usart = + (struct stm32_serial *)usart_base[USART_PORT]; u8 ret; ret = readl(&usart->sr) & USART_SR_FLAG_RXNE; |