mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
cfba4573f6
Implement support for CONFIG_SERIAL_MULTI into atmel serial driver. This driver was so far only usable directly, but this patch also adds support for the multi method. This allows using more than one serial driver alongside the atmel driver. Also, add a weak implementation of default_serial_console() returning this driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Tom Rini <trini@ti.com> Cc: Xu, Hong <Hong.Xu@atmel.com>
162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* Modified to support C structur SoC access by
|
|
* Andreas Bießmann <biessmann@corscience.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <common.h>
|
|
#include <watchdog.h>
|
|
#include <serial.h>
|
|
#include <linux/compiler.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <asm/arch/hardware.h>
|
|
|
|
#include "atmel_usart.h"
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static void atmel_serial_setbrg(void)
|
|
{
|
|
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
|
|
unsigned long divisor;
|
|
unsigned long usart_hz;
|
|
|
|
/*
|
|
* Master Clock
|
|
* Baud Rate = --------------
|
|
* 16 * CD
|
|
*/
|
|
usart_hz = get_usart_clk_rate(CONFIG_USART_ID);
|
|
divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
|
|
writel(USART3_BF(CD, divisor), &usart->brgr);
|
|
}
|
|
|
|
static int atmel_serial_init(void)
|
|
{
|
|
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
|
|
|
|
/*
|
|
* Just in case: drain transmitter register
|
|
* 1000us is enough for baudrate >= 9600
|
|
*/
|
|
if (!(readl(&usart->csr) & USART3_BIT(TXEMPTY)))
|
|
__udelay(1000);
|
|
|
|
writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr);
|
|
|
|
serial_setbrg();
|
|
|
|
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);
|
|
writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr);
|
|
/* 100us is enough for the new settings to be settled */
|
|
__udelay(100);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void atmel_serial_putc(char c)
|
|
{
|
|
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
|
|
|
|
if (c == '\n')
|
|
serial_putc('\r');
|
|
|
|
while (!(readl(&usart->csr) & USART3_BIT(TXRDY)));
|
|
writel(c, &usart->thr);
|
|
}
|
|
|
|
static void atmel_serial_puts(const char *s)
|
|
{
|
|
while (*s)
|
|
serial_putc(*s++);
|
|
}
|
|
|
|
static int atmel_serial_getc(void)
|
|
{
|
|
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
|
|
|
|
while (!(readl(&usart->csr) & USART3_BIT(RXRDY)))
|
|
WATCHDOG_RESET();
|
|
return readl(&usart->rhr);
|
|
}
|
|
|
|
static int atmel_serial_tstc(void)
|
|
{
|
|
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
|
|
return (readl(&usart->csr) & USART3_BIT(RXRDY)) != 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_MULTI
|
|
static struct serial_device atmel_serial_drv = {
|
|
.name = "atmel_serial",
|
|
.start = atmel_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = atmel_serial_setbrg,
|
|
.putc = atmel_serial_putc,
|
|
.puts = atmel_serial_puts,
|
|
.getc = atmel_serial_getc,
|
|
.tstc = atmel_serial_tstc,
|
|
};
|
|
|
|
void atmel_serial_initialize(void)
|
|
{
|
|
serial_register(&atmel_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &atmel_serial_drv;
|
|
}
|
|
#else
|
|
int serial_init(void)
|
|
{
|
|
return atmel_serial_init();
|
|
}
|
|
|
|
void serial_setbrg(void)
|
|
{
|
|
atmel_serial_setbrg();
|
|
}
|
|
|
|
void serial_putc(const char c)
|
|
{
|
|
atmel_serial_putc(c);
|
|
}
|
|
|
|
void serial_puts(const char *s)
|
|
{
|
|
atmel_serial_puts(s);
|
|
}
|
|
|
|
int serial_getc(void)
|
|
{
|
|
return atmel_serial_getc();
|
|
}
|
|
|
|
int serial_tstc(void)
|
|
{
|
|
return atmel_serial_tstc();
|
|
}
|
|
#endif
|