320 lines
6.6 KiB
C
320 lines
6.6 KiB
C
/*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* 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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/arch/s3c24x0_cpu.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SERIAL1
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#define UART_NR S3C24X0_UART0
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#elif defined(CONFIG_SERIAL2)
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# if defined(CONFIG_TRAB)
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# error "TRAB supports only CONFIG_SERIAL1"
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# endif
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#define UART_NR S3C24X0_UART1
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#elif defined(CONFIG_SERIAL3)
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# if defined(CONFIG_TRAB)
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# error "TRAB supports only CONFIG_SERIAL1"
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# endif
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#define UART_NR S3C24X0_UART2
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#else
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#error "Bad: you didn't configure serial ..."
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#endif
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#include <asm/io.h>
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#if defined(CONFIG_SERIAL_MULTI)
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#include <serial.h>
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/* Multi serial device functions */
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#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
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int s3serial##port##_init(void) \
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{ \
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return serial_init_dev(port); \
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} \
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void s3serial##port##_setbrg(void) \
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{ \
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serial_setbrg_dev(port); \
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} \
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int s3serial##port##_getc(void) \
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{ \
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return serial_getc_dev(port); \
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} \
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int s3serial##port##_tstc(void) \
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{ \
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return serial_tstc_dev(port); \
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} \
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void s3serial##port##_putc(const char c) \
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{ \
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serial_putc_dev(port, c); \
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} \
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void s3serial##port##_puts(const char *s) \
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{ \
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serial_puts_dev(port, s); \
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}
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#define INIT_S3C_SERIAL_STRUCTURE(port, name, bus) { \
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name, \
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bus, \
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s3serial##port##_init, \
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NULL,\
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s3serial##port##_setbrg, \
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s3serial##port##_getc, \
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s3serial##port##_tstc, \
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s3serial##port##_putc, \
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s3serial##port##_puts, \
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}
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#endif /* CONFIG_SERIAL_MULTI */
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#ifdef CONFIG_HWFLOW
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static int hwflow;
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#endif
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void _serial_setbrg(const int dev_index)
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{
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struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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unsigned int reg = 0;
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int i;
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/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
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reg = get_PCLK() / (16 * gd->baudrate) - 1;
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writel(reg, &uart->UBRDIV);
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for (i = 0; i < 100; i++)
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/* Delay */ ;
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}
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#if defined(CONFIG_SERIAL_MULTI)
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static inline void serial_setbrg_dev(unsigned int dev_index)
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{
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_serial_setbrg(dev_index);
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}
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#else
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void serial_setbrg(void)
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{
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_serial_setbrg(UART_NR);
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}
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#endif
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/* Initialise the serial port. The settings are always 8 data bits, no parity,
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* 1 stop bit, no start bits.
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*/
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static int serial_init_dev(const int dev_index)
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{
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struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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#ifdef CONFIG_HWFLOW
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hwflow = 0; /* turned off by default */
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#endif
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/* FIFO enable, Tx/Rx FIFO clear */
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writel(0x07, &uart->UFCON);
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writel(0x0, &uart->UMCON);
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/* Normal,No parity,1 stop,8 bit */
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writel(0x3, &uart->ULCON);
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/*
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* tx=level,rx=edge,disable timeout int.,enable rx error int.,
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* normal,interrupt or polling
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*/
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writel(0x245, &uart->UCON);
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#ifdef CONFIG_HWFLOW
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writel(0x1, &uart->UMCON); /* RTS up */
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#endif
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/* FIXME: This is sooooooooooooooooooo ugly */
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#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
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/* we need auto hw flow control on the gsm and gps port */
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if (dev_index == 0 || dev_index == 1)
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writel(0x10, &uart->UMCON);
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#endif
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_serial_setbrg(dev_index);
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return (0);
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}
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#if !defined(CONFIG_SERIAL_MULTI)
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/* Initialise the serial port. The settings are always 8 data bits, no parity,
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* 1 stop bit, no start bits.
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*/
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int serial_init(void)
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{
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return serial_init_dev(UART_NR);
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}
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#endif
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int _serial_getc(const int dev_index)
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{
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struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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while (!(readl(&uart->UTRSTAT) & 0x1))
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/* wait for character to arrive */ ;
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return readb(&uart->URXH) & 0xff;
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}
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#if defined(CONFIG_SERIAL_MULTI)
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static inline int serial_getc_dev(unsigned int dev_index)
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{
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return _serial_getc(dev_index);
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}
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#else
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int serial_getc(void)
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{
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return _serial_getc(UART_NR);
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}
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#endif
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#ifdef CONFIG_HWFLOW
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int hwflow_onoff(int on)
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{
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switch (on) {
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case 0:
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default:
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break; /* return current */
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case 1:
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hwflow = 1; /* turn on */
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break;
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case -1:
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hwflow = 0; /* turn off */
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break;
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}
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return hwflow;
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}
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#endif
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#ifdef CONFIG_MODEM_SUPPORT
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static int be_quiet = 0;
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void disable_putc(void)
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{
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be_quiet = 1;
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}
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void enable_putc(void)
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{
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be_quiet = 0;
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}
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#endif
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/*
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* Output a single byte to the serial port.
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*/
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void _serial_putc(const char c, const int dev_index)
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{
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struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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#ifdef CONFIG_MODEM_SUPPORT
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if (be_quiet)
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return;
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#endif
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while (!(readl(&uart->UTRSTAT) & 0x2))
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/* wait for room in the tx FIFO */ ;
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#ifdef CONFIG_HWFLOW
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while (hwflow && !(readl(&uart->UMSTAT) & 0x1))
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/* Wait for CTS up */ ;
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#endif
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writeb(c, &uart->UTXH);
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc('\r');
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}
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#if defined(CONFIG_SERIAL_MULTI)
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static inline void serial_putc_dev(unsigned int dev_index, const char c)
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{
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_serial_putc(c, dev_index);
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}
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#else
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void serial_putc(const char c)
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{
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_serial_putc(c, UART_NR);
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}
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#endif
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/*
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* Test whether a character is in the RX buffer
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*/
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int _serial_tstc(const int dev_index)
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{
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struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
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return readl(&uart->UTRSTAT) & 0x1;
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}
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#if defined(CONFIG_SERIAL_MULTI)
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static inline int serial_tstc_dev(unsigned int dev_index)
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{
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return _serial_tstc(dev_index);
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}
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#else
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int serial_tstc(void)
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{
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return _serial_tstc(UART_NR);
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}
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#endif
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void _serial_puts(const char *s, const int dev_index)
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{
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while (*s) {
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_serial_putc(*s++, dev_index);
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}
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}
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#if defined(CONFIG_SERIAL_MULTI)
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static inline void serial_puts_dev(int dev_index, const char *s)
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{
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_serial_puts(s, dev_index);
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}
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#else
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void serial_puts(const char *s)
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{
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_serial_puts(s, UART_NR);
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}
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#endif
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#if defined(CONFIG_SERIAL_MULTI)
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DECLARE_S3C_SERIAL_FUNCTIONS(0);
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struct serial_device s3c24xx_serial0_device =
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INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
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DECLARE_S3C_SERIAL_FUNCTIONS(1);
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struct serial_device s3c24xx_serial1_device =
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INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
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DECLARE_S3C_SERIAL_FUNCTIONS(2);
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struct serial_device s3c24xx_serial2_device =
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INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");
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#endif /* CONFIG_SERIAL_MULTI */
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