u-boot/drivers/serial/serial_s3c24x0.c

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/*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.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
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* 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 <asm/arch/s3c24x0_cpu.h>
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DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SERIAL1
#define UART_NR S3C24X0_UART0
#elif defined(CONFIG_SERIAL2)
# if defined(CONFIG_TRAB)
# error "TRAB supports only CONFIG_SERIAL1"
# endif
#define UART_NR S3C24X0_UART1
#elif defined(CONFIG_SERIAL3)
# if defined(CONFIG_TRAB)
# error "TRAB supports only CONFIG_SERIAL1"
# endif
#define UART_NR S3C24X0_UART2
#else
#error "Bad: you didn't configure serial ..."
#endif
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#include <asm/io.h>
#if defined(CONFIG_SERIAL_MULTI)
#include <serial.h>
/* Multi serial device functions */
#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
int s3serial##port##_init(void) \
{ \
return serial_init_dev(port); \
} \
void s3serial##port##_setbrg(void) \
{ \
serial_setbrg_dev(port); \
} \
int s3serial##port##_getc(void) \
{ \
return serial_getc_dev(port); \
} \
int s3serial##port##_tstc(void) \
{ \
return serial_tstc_dev(port); \
} \
void s3serial##port##_putc(const char c) \
{ \
serial_putc_dev(port, c); \
} \
void s3serial##port##_puts(const char *s) \
{ \
serial_puts_dev(port, s); \
}
#define INIT_S3C_SERIAL_STRUCTURE(port, name, bus) { \
name, \
bus, \
s3serial##port##_init, \
NULL,\
s3serial##port##_setbrg, \
s3serial##port##_getc, \
s3serial##port##_tstc, \
s3serial##port##_putc, \
s3serial##port##_puts, \
}
#endif /* CONFIG_SERIAL_MULTI */
#ifdef CONFIG_HWFLOW
static int hwflow;
#endif
void _serial_setbrg(const int dev_index)
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{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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unsigned int reg = 0;
int i;
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/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
reg = get_PCLK() / (16 * gd->baudrate) - 1;
writel(reg, &uart->ubrdiv);
for (i = 0; i < 100; i++)
/* Delay */ ;
}
#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_setbrg_dev(unsigned int dev_index)
{
_serial_setbrg(dev_index);
}
#else
void serial_setbrg(void)
{
_serial_setbrg(UART_NR);
}
#endif
/* Initialise the serial port. The settings are always 8 data bits, no parity,
* 1 stop bit, no start bits.
*/
static int serial_init_dev(const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
#ifdef CONFIG_HWFLOW
hwflow = 0; /* turned off by default */
#endif
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/* FIFO enable, Tx/Rx FIFO clear */
writel(0x07, &uart->ufcon);
writel(0x0, &uart->umcon);
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/* Normal,No parity,1 stop,8 bit */
writel(0x3, &uart->ulcon);
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/*
* tx=level,rx=edge,disable timeout int.,enable rx error int.,
* normal,interrupt or polling
*/
writel(0x245, &uart->ucon);
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#ifdef CONFIG_HWFLOW
writel(0x1, &uart->umcon); /* rts up */
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#endif
/* FIXME: This is sooooooooooooooooooo ugly */
#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
/* we need auto hw flow control on the gsm and gps port */
if (dev_index == 0 || dev_index == 1)
writel(0x10, &uart->umcon);
#endif
_serial_setbrg(dev_index);
return (0);
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}
#if !defined(CONFIG_SERIAL_MULTI)
/* Initialise the serial port. The settings are always 8 data bits, no parity,
* 1 stop bit, no start bits.
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*/
int serial_init(void)
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{
return serial_init_dev(UART_NR);
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}
#endif
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/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int _serial_getc(const int dev_index)
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{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
while (!(readl(&uart->utrstat) & 0x1))
/* wait for character to arrive */ ;
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return readb(&uart->urxh) & 0xff;
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}
#if defined(CONFIG_SERIAL_MULTI)
static inline int serial_getc_dev(unsigned int dev_index)
{
return _serial_getc(dev_index);
}
#else
int serial_getc(void)
{
return _serial_getc(UART_NR);
}
#endif
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#ifdef CONFIG_HWFLOW
int hwflow_onoff(int on)
{
switch (on) {
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case 0:
default:
break; /* return current */
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case 1:
hwflow = 1; /* turn on */
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break;
case -1:
hwflow = 0; /* turn off */
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break;
}
return hwflow;
}
#endif
#ifdef CONFIG_MODEM_SUPPORT
static int be_quiet = 0;
void disable_putc(void)
{
be_quiet = 1;
}
void enable_putc(void)
{
be_quiet = 0;
}
#endif
/*
* Output a single byte to the serial port.
*/
void _serial_putc(const char c, const int dev_index)
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{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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#ifdef CONFIG_MODEM_SUPPORT
if (be_quiet)
return;
#endif
while (!(readl(&uart->utrstat) & 0x2))
/* wait for room in the tx FIFO */ ;
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#ifdef CONFIG_HWFLOW
while (hwflow && !(readl(&uart->umstat) & 0x1))
/* Wait for CTS up */ ;
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#endif
writeb(c, &uart->utxh);
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/* If \n, also do \r */
if (c == '\n')
serial_putc('\r');
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}
#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_putc_dev(unsigned int dev_index, const char c)
{
_serial_putc(c, dev_index);
}
#else
void serial_putc(const char c)
{
_serial_putc(c, UART_NR);
}
#endif
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/*
* Test whether a character is in the RX buffer
*/
int _serial_tstc(const int dev_index)
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{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
return readl(&uart->utrstat) & 0x1;
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}
#if defined(CONFIG_SERIAL_MULTI)
static inline int serial_tstc_dev(unsigned int dev_index)
{
return _serial_tstc(dev_index);
}
#else
int serial_tstc(void)
{
return _serial_tstc(UART_NR);
}
#endif
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void _serial_puts(const char *s, const int dev_index)
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{
while (*s) {
_serial_putc(*s++, dev_index);
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}
}
#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_puts_dev(int dev_index, const char *s)
{
_serial_puts(s, dev_index);
}
#else
void serial_puts(const char *s)
{
_serial_puts(s, UART_NR);
}
#endif
#if defined(CONFIG_SERIAL_MULTI)
DECLARE_S3C_SERIAL_FUNCTIONS(0);
struct serial_device s3c24xx_serial0_device =
INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
DECLARE_S3C_SERIAL_FUNCTIONS(1);
struct serial_device s3c24xx_serial1_device =
INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
DECLARE_S3C_SERIAL_FUNCTIONS(2);
struct serial_device s3c24xx_serial2_device =
INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");
#endif /* CONFIG_SERIAL_MULTI */