drivers/serial/serial_s3c24x0.c

   1 /*
   2  * (C) Copyright 2002
   3  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include <common.h>
  22 #if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
  23 #include <s3c2400.h>
  24 #elif defined(CONFIG_S3C2410)
  25 #include <s3c2410.h>
  26 #endif
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 #ifdef CONFIG_SERIAL1
  31 #define UART_NR S3C24X0_UART0
  32
  33 #elif defined(CONFIG_SERIAL2)
  34 # if defined(CONFIG_TRAB)
  35 #  error "TRAB supports only CONFIG_SERIAL1"
  36 # endif
  37 #define UART_NR S3C24X0_UART1
  38
  39 #elif defined(CONFIG_SERIAL3)
  40 # if defined(CONFIG_TRAB)
  41 #  error "TRAB supports only CONFIG_SERIAL1"
  42 # endif
  43 #define UART_NR S3C24X0_UART2
  44
  45 #else
  46 #error "Bad: you didn't configure serial ..."
  47 #endif
  48
  49 #include <asm/io.h>
  50
  51 #if defined(CONFIG_SERIAL_MULTI)
  52 #include <serial.h>
  53
  54 /* Multi serial device functions */
  55 #define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
  56         int s3serial##port##_init(void) \
  57         { \
  58                 return serial_init_dev(port); \
  59         } \
  60         void s3serial##port##_setbrg(void) \
  61         { \
  62                 serial_setbrg_dev(port); \
  63         } \
  64         int s3serial##port##_getc(void) \
  65         { \
  66                 return serial_getc_dev(port); \
  67         } \
  68         int s3serial##port##_tstc(void) \
  69         { \
  70                 return serial_tstc_dev(port); \
  71         } \
  72         void s3serial##port##_putc(const char c) \
  73         { \
  74                 serial_putc_dev(port, c); \
  75         } \
  76         void s3serial##port##_puts(const char *s) \
  77         { \
  78                 serial_puts_dev(port, s); \
  79         }
  80
  81 #define INIT_S3C_SERIAL_STRUCTURE(port, name, bus) { \
  82         name, \
  83         bus, \
  84         s3serial##port##_init, \
  85         s3serial##port##_setbrg, \
  86         s3serial##port##_getc, \
  87         s3serial##port##_tstc, \
  88         s3serial##port##_putc, \
  89         s3serial##port##_puts, \
  90 }
  91
  92 #endif /* CONFIG_SERIAL_MULTI */
  93
  94 #ifdef CONFIG_HWFLOW
  95 static int hwflow;
  96 #endif
  97
  98 void _serial_setbrg(const int dev_index)
  99 {
 100         struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 101         unsigned int reg = 0;
 102         int i;
 103
 104         /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
 105         reg = get_PCLK() / (16 * gd->baudrate) - 1;
 106
 107         writel(reg, &uart->UBRDIV);
 108         for (i = 0; i < 100; i++)
 109                 /* Delay */ ;
 110 }
 111
 112 #if defined(CONFIG_SERIAL_MULTI)
 113 static inline void serial_setbrg_dev(unsigned int dev_index)
 114 {
 115         _serial_setbrg(dev_index);
 116 }
 117 #else
 118 void serial_setbrg(void)
 119 {
 120         _serial_setbrg(UART_NR);
 121 }
 122 #endif
 123
 124
 125 /* Initialise the serial port. The settings are always 8 data bits, no parity,
 126  * 1 stop bit, no start bits.
 127  */
 128 static int serial_init_dev(const int dev_index)
 129 {
 130         struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 131
 132 #ifdef CONFIG_HWFLOW
 133         hwflow = 0;     /* turned off by default */
 134 #endif
 135
 136         /* FIFO enable, Tx/Rx FIFO clear */
 137         writel(0x07, &uart->UFCON);
 138         writel(0x0, &uart->UMCON);
 139
 140         /* Normal,No parity,1 stop,8 bit */
 141         writel(0x3, &uart->ULCON);
 142         /*
 143          * tx=level,rx=edge,disable timeout int.,enable rx error int.,
 144          * normal,interrupt or polling
 145          */
 146         writel(0x245, &uart->UCON);
 147
 148 #ifdef CONFIG_HWFLOW
 149         writel(0x1, &uart->UMCON);      /* RTS up */
 150 #endif
 151
 152         /* FIXME: This is sooooooooooooooooooo ugly */
 153 #if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
 154         /* we need auto hw flow control on the gsm and gps port */
 155         if (dev_index == 0 || dev_index == 1)
 156                 writel(0x10, &uart->UMCON);
 157 #endif
 158         _serial_setbrg(dev_index);
 159
 160         return (0);
 161 }
 162
 163 #if !defined(CONFIG_SERIAL_MULTI)
 164 /* Initialise the serial port. The settings are always 8 data bits, no parity,
 165  * 1 stop bit, no start bits.
 166  */
 167 int serial_init(void)
 168 {
 169         return serial_init_dev(UART_NR);
 170 }
 171 #endif
 172
 173 /*
 174  * Read a single byte from the serial port. Returns 1 on success, 0
 175  * otherwise. When the function is succesfull, the character read is
 176  * written into its argument c.
 177  */
 178 int _serial_getc(const int dev_index)
 179 {
 180         struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 181
 182         while (!(readl(&uart->UTRSTAT) & 0x1))
 183                 /* wait for character to arrive */ ;
 184
 185         return readb(&uart->URXH) & 0xff;
 186 }
 187
 188 #if defined(CONFIG_SERIAL_MULTI)
 189 static inline int serial_getc_dev(unsigned int dev_index)
 190 {
 191         return _serial_getc(dev_index);
 192 }
 193 #else
 194 int serial_getc(void)
 195 {
 196         return _serial_getc(UART_NR);
 197 }
 198 #endif
 199
 200 #ifdef CONFIG_HWFLOW
 201 int hwflow_onoff(int on)
 202 {
 203         switch (on) {
 204         case 0:
 205         default:
 206                 break;          /* return current */
 207         case 1:
 208                 hwflow = 1;     /* turn on */
 209                 break;
 210         case -1:
 211                 hwflow = 0;     /* turn off */
 212                 break;
 213         }
 214         return hwflow;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_MODEM_SUPPORT
 219 static int be_quiet = 0;
 220 void disable_putc(void)
 221 {
 222         be_quiet = 1;
 223 }
 224
 225 void enable_putc(void)
 226 {
 227         be_quiet = 0;
 228 }
 229 #endif
 230
 231
 232 /*
 233  * Output a single byte to the serial port.
 234  */
 235 void _serial_putc(const char c, const int dev_index)
 236 {
 237         struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 238 #ifdef CONFIG_MODEM_SUPPORT
 239         if (be_quiet)
 240                 return;
 241 #endif
 242
 243         while (!(readl(&uart->UTRSTAT) & 0x2))
 244                 /* wait for room in the tx FIFO */ ;
 245
 246 #ifdef CONFIG_HWFLOW
 247         while (hwflow && !(readl(&uart->UMSTAT) & 0x1))
 248                 /* Wait for CTS up */ ;
 249 #endif
 250
 251         writeb(c, &uart->UTXH);
 252
 253         /* If \n, also do \r */
 254         if (c == '\n')
 255                 serial_putc('\r');
 256 }
 257
 258 #if defined(CONFIG_SERIAL_MULTI)
 259 static inline void serial_putc_dev(unsigned int dev_index, const char c)
 260 {
 261         _serial_putc(c, dev_index);
 262 }
 263 #else
 264 void serial_putc(const char c)
 265 {
 266         _serial_putc(c, UART_NR);
 267 }
 268 #endif
 269
 270
 271 /*
 272  * Test whether a character is in the RX buffer
 273  */
 274 int _serial_tstc(const int dev_index)
 275 {
 276         struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 277
 278         return readl(&uart->UTRSTAT) & 0x1;
 279 }
 280
 281 #if defined(CONFIG_SERIAL_MULTI)
 282 static inline int serial_tstc_dev(unsigned int dev_index)
 283 {
 284         return _serial_tstc(dev_index);
 285 }
 286 #else
 287 int serial_tstc(void)
 288 {
 289         return _serial_tstc(UART_NR);
 290 }
 291 #endif
 292
 293 void _serial_puts(const char *s, const int dev_index)
 294 {
 295         while (*s) {
 296                 _serial_putc(*s++, dev_index);
 297         }
 298 }
 299
 300 #if defined(CONFIG_SERIAL_MULTI)
 301 static inline void serial_puts_dev(int dev_index, const char *s)
 302 {
 303         _serial_puts(s, dev_index);
 304 }
 305 #else
 306 void serial_puts(const char *s)
 307 {
 308         _serial_puts(s, UART_NR);
 309 }
 310 #endif
 311
 312 #if defined(CONFIG_SERIAL_MULTI)
 313 DECLARE_S3C_SERIAL_FUNCTIONS(0);
 314 struct serial_device s3c24xx_serial0_device =
 315 INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
 316 DECLARE_S3C_SERIAL_FUNCTIONS(1);
 317 struct serial_device s3c24xx_serial1_device =
 318 INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
 319 DECLARE_S3C_SERIAL_FUNCTIONS(2);
 320 struct serial_device s3c24xx_serial2_device =
 321 INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");
 322 #endif /* CONFIG_SERIAL_MULTI */