stm32f4: add serial print port
Add the stm32F4 board's serial ports support.
User can use it easily.
The user only need to edit the number of the usart.
The patch also fix the serial print out.
Last, this version of patch fix the first patch checkpatch.pl error.
Thanks to Kamil Lulko.
Signed-off-by: kunhuahuang <huangkunhua@gmail.com>
diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c
index 8c613db..8b2830b 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 @@
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 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_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 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 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;