/* * (C) Copyright 2002 * Gary Jennejohn, DENX Software Engineering, * * 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 #include #include DECLARE_GLOBAL_DATA_PTR; #ifdef CONFIG_SERIAL1 #define UART_NR S3C24X0_UART0 #elif defined(CONFIG_SERIAL2) #define UART_NR S3C24X0_UART1 #elif defined(CONFIG_SERIAL3) #define UART_NR S3C24X0_UART2 #else #error "Bad: you didn't configure serial ..." #endif #include #include /* 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) { \ .name = __name, \ .start = s3serial##port##_init, \ .stop = NULL, \ .setbrg = s3serial##port##_setbrg, \ .getc = s3serial##port##_getc, \ .tstc = s3serial##port##_tstc, \ .putc = s3serial##port##_putc, \ .puts = s3serial##port##_puts, \ } #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 */ ; } static inline void serial_setbrg_dev(unsigned int dev_index) { _serial_setbrg(dev_index); } /* 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); } /* * 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; } static inline int serial_getc_dev(unsigned int dev_index) { return _serial_getc(dev_index); } #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'); } static inline void serial_putc_dev(unsigned int dev_index, const char c) { _serial_putc(c, dev_index); } /* * 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; } static inline int serial_tstc_dev(unsigned int dev_index) { return _serial_tstc(dev_index); } void _serial_puts(const char *s, const int dev_index) { while (*s) { _serial_putc(*s++, dev_index); } } static inline void serial_puts_dev(int dev_index, const char *s) { _serial_puts(s, dev_index); } DECLARE_S3C_SERIAL_FUNCTIONS(0); struct serial_device s3c24xx_serial0_device = INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0"); DECLARE_S3C_SERIAL_FUNCTIONS(1); struct serial_device s3c24xx_serial1_device = INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1"); DECLARE_S3C_SERIAL_FUNCTIONS(2); struct serial_device s3c24xx_serial2_device = INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2"); __weak struct serial_device *default_serial_console(void) { #if defined(CONFIG_SERIAL1) return &s3c24xx_serial0_device; #elif defined(CONFIG_SERIAL2) return &s3c24xx_serial1_device; #elif defined(CONFIG_SERIAL3) return &s3c24xx_serial2_device; #else #error "CONFIG_SERIAL? missing." #endif } void s3c24xx_serial_initialize(void) { serial_register(&s3c24xx_serial0_device); serial_register(&s3c24xx_serial1_device); serial_register(&s3c24xx_serial2_device); }