Add the uart init function to be used on both probe and the early debug uart init. For the latter, the input clock should be from CONFIG_DEBUG_UART_CLOCK.
Signed-off-by: Wenyou Yang wenyou.yang@atmel.com Reviewed-by: Simon Glass sjg@chromium.org ---
Changes in v2: None
drivers/serial/atmel_usart.c | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-)
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c index 7674f97e8d..8b1e0d55a4 100644 --- a/drivers/serial/atmel_usart.c +++ b/drivers/serial/atmel_usart.c @@ -25,6 +25,7 @@
DECLARE_GLOBAL_DATA_PTR;
+#ifndef CONFIG_DM_SERIAL static void atmel_serial_setbrg_internal(atmel_usart3_t *usart, int id, int baudrate) { @@ -66,7 +67,6 @@ static void atmel_serial_activate(atmel_usart3_t *usart) __udelay(100); }
-#ifndef CONFIG_DM_SERIAL static void atmel_serial_setbrg(void) { atmel_serial_setbrg_internal((atmel_usart3_t *)CONFIG_USART_BASE, @@ -138,12 +138,37 @@ struct atmel_serial_priv { atmel_usart3_t *usart; };
+static void _atmel_serial_set_brg(atmel_usart3_t *usart, + ulong usart_clk_rate, int baudrate) +{ + unsigned long divisor; + + divisor = (usart_clk_rate / 16 + baudrate / 2) / baudrate; + writel(USART3_BF(CD, divisor), &usart->brgr); +} + +void _atmel_serial_init(atmel_usart3_t *usart, + ulong usart_clk_rate, int baudrate) +{ + writel(USART3_BIT(RXDIS) | USART3_BIT(TXDIS), &usart->cr); + + writel((USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL) | + USART3_BF(USCLKS, USART3_USCLKS_MCK) | + USART3_BF(CHRL, USART3_CHRL_8) | + USART3_BF(PAR, USART3_PAR_NONE) | + USART3_BF(NBSTOP, USART3_NBSTOP_1)), &usart->mr); + + _atmel_serial_set_brg(usart, usart_clk_rate, baudrate); + + writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr); + writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr); +} + int atmel_serial_setbrg(struct udevice *dev, int baudrate) { struct atmel_serial_priv *priv = dev_get_priv(dev);
- atmel_serial_setbrg_internal(priv->usart, 0 /* ignored */, baudrate); - atmel_serial_activate(priv->usart); + _atmel_serial_set_brg(priv->usart, get_usart_clk_rate(0), baudrate);
return 0; } @@ -202,7 +227,8 @@ static int atmel_serial_probe(struct udevice *dev) plat->base_addr = (uint32_t)addr_base; #endif priv->usart = (atmel_usart3_t *)plat->base_addr; - atmel_serial_init_internal(priv->usart); + + _atmel_serial_init(priv->usart, get_usart_clk_rate(0), gd->baudrate);
return 0; } @@ -233,7 +259,7 @@ static inline void _debug_uart_init(void) { atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_DEBUG_UART_BASE;
- atmel_serial_setbrg_internal(usart, 0, CONFIG_BAUDRATE); + _atmel_serial_init(usart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); }
static inline void _debug_uart_putc(int ch)