diff options
Diffstat (limited to 'u-boot/drivers/serial/serial_s3c24x0.c')
| -rw-r--r-- | u-boot/drivers/serial/serial_s3c24x0.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/u-boot/drivers/serial/serial_s3c24x0.c b/u-boot/drivers/serial/serial_s3c24x0.c new file mode 100644 index 0000000..f42b15e --- /dev/null +++ b/u-boot/drivers/serial/serial_s3c24x0.c @@ -0,0 +1,319 @@ +/* + * (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 + * 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> + +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 + +#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) +{ + struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index); + unsigned int reg = 0; + int i; + + /* 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 + + /* FIFO enable, Tx/Rx FIFO clear */ + writel(0x07, &uart->ufcon); + writel(0x0, &uart->umcon); + + /* Normal,No parity,1 stop,8 bit */ + writel(0x3, &uart->ulcon); + /* + * tx=level,rx=edge,disable timeout int.,enable rx error int., + * normal,interrupt or polling + */ + writel(0x245, &uart->ucon); + +#ifdef CONFIG_HWFLOW + writel(0x1, &uart->umcon); /* rts up */ +#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); +} + +#if !defined(CONFIG_SERIAL_MULTI) +/* Initialise the serial port. The settings are always 8 data bits, no parity, + * 1 stop bit, no start bits. + */ +int serial_init(void) +{ + return serial_init_dev(UART_NR); +} +#endif + +/* + * 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) +{ + struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index); + + while (!(readl(&uart->utrstat) & 0x1)) + /* wait for character to arrive */ ; + + return readb(&uart->urxh) & 0xff; +} + +#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 + +#ifdef CONFIG_HWFLOW +int hwflow_onoff(int on) +{ + switch (on) { + case 0: + default: + break; /* return current */ + case 1: + hwflow = 1; /* turn on */ + break; + case -1: + hwflow = 0; /* turn off */ + 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) +{ + struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index); +#ifdef CONFIG_MODEM_SUPPORT + if (be_quiet) + return; +#endif + + while (!(readl(&uart->utrstat) & 0x2)) + /* wait for room in the tx FIFO */ ; + +#ifdef CONFIG_HWFLOW + while (hwflow && !(readl(&uart->umstat) & 0x1)) + /* Wait for CTS up */ ; +#endif + + writeb(c, &uart->utxh); + + /* If \n, also do \r */ + if (c == '\n') + serial_putc('\r'); +} + +#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 + + +/* + * Test whether a character is in the RX buffer + */ +int _serial_tstc(const int dev_index) +{ + struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index); + + return readl(&uart->utrstat) & 0x1; +} + +#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 + +void _serial_puts(const char *s, const int dev_index) +{ + while (*s) { + _serial_putc(*s++, dev_index); + } +} + +#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 */ |