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atmel serial: add initialization and baudrate functions 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2008-08-26 10:48:11 +02:00
parent 4da7734725
commit bc7915cafa
1 changed files with 36 additions and 16 deletions
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52
drivers/serial/atmel.c
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@ -22,6 +22,7 @@
#include <init.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/clk.h>
/* USART3 register offsets */
#define USART3_CR 0x0000
@ -308,19 +309,6 @@
<< USART3_##name##_OFFSET)) \
| USART3_BF(name,value))
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
static int atmel_serial_init_port(struct console_device *cdev)
{
// struct device_d *dev = cdev->dev;
// ulong base = dev->map_base;
return 0;
}
static void atmel_serial_putc(struct console_device *cdev, char c)
{
struct device_d *dev = cdev->dev;
@ -347,8 +335,41 @@ static int atmel_serial_getc(struct console_device *cdev)
static int atmel_serial_setbaudrate(struct console_device *cdev, int baudrate)
{
// struct device_d *dev = cdev->dev;
// ulong base = dev->map_base;
struct device_d *dev = cdev->dev;
unsigned long divisor;
unsigned long usart_hz;
/*
* Master Clock
* Baud Rate = --------------
* 16 * CD
*/
usart_hz = get_usart_clk_rate(0);
divisor = (usart_hz / 16 + baudrate / 2) / baudrate;
writel(USART3_BF(CD, divisor), dev->map_base + USART3_BRGR);
return 0;
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
static int atmel_serial_init_port(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), dev->map_base + USART3_CR);
atmel_serial_setbaudrate(cdev, 115200);
writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), dev->map_base + USART3_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)), dev->map_base + USART3_MR);
return 0;
}
@ -367,7 +388,6 @@ static int atmel_serial_probe(struct device_d *dev)
cdev->setbrg = atmel_serial_setbaudrate;
atmel_serial_init_port(cdev);
atmel_serial_setbaudrate(cdev, 115200);
/* Enable UART */