[U-Boot] [PATCH 5/7] dm: at91: Refactor serial driver slightly for driver model
Simon Glass
sjg at chromium.org
Mon Oct 6 20:14:09 CEST 2014
Before adding driver model support, split out a few of the functions so
that they can be used by the driver model code.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
drivers/serial/atmel_usart.c | 32 +++++++++++++++++++++++---------
1 file changed, 23 insertions(+), 9 deletions(-)
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index 8f0e348..ce36e99 100644
--- a/drivers/serial/atmel_usart.c
+++ b/drivers/serial/atmel_usart.c
@@ -19,9 +19,9 @@
DECLARE_GLOBAL_DATA_PTR;
-static void atmel_serial_setbrg(void)
+static void atmel_serial_setbrg_internal(atmel_usart3_t *usart, int id,
+ int baudrate)
{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
unsigned long divisor;
unsigned long usart_hz;
@@ -30,15 +30,13 @@ static void atmel_serial_setbrg(void)
* Baud Rate = --------------
* 16 * CD
*/
- usart_hz = get_usart_clk_rate(CONFIG_USART_ID);
- divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
+ usart_hz = get_usart_clk_rate(id);
+ divisor = (usart_hz / 16 + baudrate / 2) / baudrate;
writel(USART3_BF(CD, divisor), &usart->brgr);
}
-static int atmel_serial_init(void)
+static void atmel_serial_init_internal(atmel_usart3_t *usart)
{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
-
/*
* Just in case: drain transmitter register
* 1000us is enough for baudrate >= 9600
@@ -47,9 +45,10 @@ static int atmel_serial_init(void)
__udelay(1000);
writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr);
+}
- serial_setbrg();
-
+static void atmel_serial_activate(atmel_usart3_t *usart)
+{
writel((USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
| USART3_BF(USCLKS, USART3_USCLKS_MCK)
| USART3_BF(CHRL, USART3_CHRL_8)
@@ -59,6 +58,21 @@ static int atmel_serial_init(void)
writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr);
/* 100us is enough for the new settings to be settled */
__udelay(100);
+}
+
+static void atmel_serial_setbrg(void)
+{
+ atmel_serial_setbrg_internal((atmel_usart3_t *)CONFIG_USART_BASE,
+ CONFIG_USART_ID, gd->baudrate);
+}
+
+static int atmel_serial_init(void)
+{
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+ atmel_serial_init_internal(usart);
+ serial_setbrg();
+ atmel_serial_activate(usart);
return 0;
}
--
2.1.0.rc2.206.gedb03e5
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