cpu/arm920t/s3c24x0/serial.c

   1 /*
   2  * (C) Copyright 2002
   3  * Gary Jennejohn, DENX Software Engineering, <gj@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_S3C2410) || \
  23     defined(CONFIG_S3C2440) || defined (CONFIG_S3C2442) || \
  24     defined (CONFIG_TRAB)
  25
  26 #if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
  27 #include <s3c2400.h>
  28 #elif defined(CONFIG_S3C2410)
  29 #include <s3c2410.h>
  30 #elif defined(CONFIG_S3C2440) || defined(CONFIG_S3C2442)
  31 #include <s3c2440.h>
  32 #endif
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #ifdef CONFIG_SERIAL1
  37 #define UART_NR S3C24X0_UART0
  38
  39 #elif defined(CONFIG_SERIAL2)
  40 # if defined(CONFIG_TRAB)
  41 #  error "TRAB supports only CONFIG_SERIAL1"
  42 # endif
  43 #define UART_NR S3C24X0_UART1
  44
  45 #elif defined(CONFIG_SERIAL3)
  46 # if defined(CONFIG_TRAB)
  47 #  #error "TRAB supports only CONFIG_SERIAL1"
  48 # endif
  49 #define UART_NR S3C24X0_UART2
  50
  51 #else
  52 #error "Bad: you didn't configure serial ..."
  53 #endif
  54
  55 #if defined(CONFIG_SERIAL_MULTI)
  56 #include <serial.h>
  57
  58 /* Multi serial device functions */
  59 #define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
  60     int  s3serial##port##_init (void) {\
  61         return serial_init_dev(port);}\
  62     void s3serial##port##_setbrg (void) {\
  63         serial_setbrg_dev(port);}\
  64     int  s3serial##port##_getc (void) {\
  65         return serial_getc_dev(port);}\
  66     int  s3serial##port##_tstc (void) {\
  67         return serial_tstc_dev(port);}\
  68     void s3serial##port##_putc (const char c) {\
  69         serial_putc_dev(port, c);}\
  70     void s3serial##port##_puts (const char *s) {\
  71         serial_puts_dev(port, s);}
  72
  73 #define INIT_S3C_SERIAL_STRUCTURE(port,name,bus) {\
  74         name,\
  75         bus,\
  76         s3serial##port##_init,\
  77         s3serial##port##_setbrg,\
  78         s3serial##port##_getc,\
  79         s3serial##port##_tstc,\
  80         s3serial##port##_putc,\
  81         s3serial##port##_puts, }
  82
  83 #endif /* CONFIG_SERIAL_MULTI */
  84
  85 void _serial_setbrg(const int dev_index)
  86 {
  87         S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
  88         unsigned int reg = 0;
  89         int i;
  90
  91         /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
  92         reg = get_PCLK() / (16 * gd->baudrate) - 1;
  93
  94         uart->UBRDIV = reg;
  95         for (i = 0; i < 100; i++);
  96 }
  97 #if defined(CONFIG_SERIAL_MULTI)
  98 static inline void
  99 serial_setbrg_dev(unsigned int dev_index)
 100 {
 101         _serial_setbrg(dev_index);
 102 }
 103 #else
 104 void serial_setbrg(void)
 105 {
 106         _serial_setbrg(UART_NR);
 107 }
 108 #endif
 109
 110
 111 /* Initialise the serial port. The settings are always 8 data bits, no parity,
 112  * 1 stop bit, no start bits.
 113  */
 114 static int serial_init_dev(const int dev_index)
 115 {
 116         S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 117
 118         /* FIFO enable, Tx/Rx FIFO clear */
 119         uart->UFCON = 0x07;
 120         uart->UMCON = 0x0;
 121
 122         /* Normal,No parity,1 stop,8 bit */
 123         uart->ULCON = 0x3;
 124         /*
 125          * tx=level,rx=edge,disable timeout int.,enable rx error int.,
 126          * normal,interrupt or polling
 127          */
 128         uart->UCON = 0x245;
 129
 130 #ifdef CONFIG_HWFLOW
 131         uart->UMCON = 0x1; /* RTS up */
 132 #endif
 133
 134         /* FIXME: This is sooooooooooooooooooo ugly */
 135 #include <config.h>
 136 #if defined(CONFIG_GTA02_REVISION)
 137         /* we need auto hw flow control on the gsm and gps port */
 138         if (dev_index == 0 || dev_index == 1)
 139                 uart->UMCON = 0x10;
 140 #endif
 141         _serial_setbrg(dev_index);
 142
 143         return (0);
 144 }
 145
 146 #if !defined(CONFIG_SERIAL_MULTI)
 147 /* Initialise the serial port. The settings are always 8 data bits, no parity,
 148  * 1 stop bit, no start bits.
 149  */
 150 int serial_init (void)
 151 {
 152         return serial_init_dev(UART_NR);
 153 }
 154 #endif
 155
 156 /*
 157  * Read a single byte from the serial port. Returns 1 on success, 0
 158  * otherwise. When the function is succesfull, the character read is
 159  * written into its argument c.
 160  */
 161 int _serial_getc (const int dev_index)
 162 {
 163         S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 164
 165         /* wait for character to arrive */
 166         while (!(uart->UTRSTAT & 0x1));
 167
 168         return uart->URXH & 0xff;
 169 }
 170 #if defined(CONFIG_SERIAL_MULTI)
 171 static inline int serial_getc_dev(unsigned int dev_index)
 172 {
 173         return _serial_getc(dev_index);
 174 }
 175 #else
 176 int serial_getc (void)
 177 {
 178         return _serial_getc(UART_NR);
 179 }
 180 #endif
 181
 182 #ifdef CONFIG_HWFLOW
 183 static int hwflow = 0; /* turned off by default */
 184 int hwflow_onoff(int on)
 185 {
 186         switch(on) {
 187         case 0:
 188         default:
 189                 break; /* return current */
 190         case 1:
 191                 hwflow = 1; /* turn on */
 192                 break;
 193         case -1:
 194                 hwflow = 0; /* turn off */
 195                 break;
 196         }
 197         return hwflow;
 198 }
 199 #endif
 200
 201 #ifdef CONFIG_MODEM_SUPPORT
 202 static int be_quiet = 0;
 203 void disable_putc(void)
 204 {
 205         be_quiet = 1;
 206 }
 207
 208 void enable_putc(void)
 209 {
 210         be_quiet = 0;
 211 }
 212 #endif
 213
 214
 215 /*
 216  * Output a single byte to the serial port.
 217  */
 218 void _serial_putc (const char c, const int dev_index)
 219 {
 220         S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 221 #ifdef CONFIG_MODEM_SUPPORT
 222         if (be_quiet)
 223                 return;
 224 #endif
 225
 226         /* wait for room in the tx FIFO */
 227         while (!(uart->UTRSTAT & 0x2));
 228
 229 #ifdef CONFIG_HWFLOW
 230         /* Wait for CTS up */
 231         while(hwflow && !(uart->UMSTAT & 0x1))
 232                 ;
 233 #endif
 234
 235         uart->UTXH = c;
 236
 237         /* If \n, also do \r */
 238         if (c == '\n')
 239                 serial_putc ('\r');
 240 }
 241 #if defined(CONFIG_SERIAL_MULTI)
 242 static inline void serial_putc_dev(unsigned int dev_index, const char c)
 243 {
 244         _serial_putc(c, dev_index);
 245 }
 246 #else
 247 void serial_putc(const char c)
 248 {
 249         _serial_putc(c, UART_NR);
 250 }
 251 #endif
 252
 253
 254 /*
 255  * Test whether a character is in the RX buffer
 256  */
 257 int _serial_tstc(const int dev_index)
 258 {
 259         S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 260
 261         return uart->UTRSTAT & 0x1;
 262 }
 263 #if defined(CONFIG_SERIAL_MULTI)
 264 static inline int
 265 serial_tstc_dev(unsigned int dev_index)
 266 {
 267         return _serial_tstc(dev_index);
 268 }
 269 #else
 270 int serial_tstc(void)
 271 {
 272         return _serial_tstc(UART_NR);
 273 }
 274 #endif
 275
 276 void _serial_puts(const char *s, const int dev_index)
 277 {
 278         while (*s) {
 279                 _serial_putc (*s++, dev_index);
 280         }
 281 }
 282 #if defined(CONFIG_SERIAL_MULTI)
 283 static inline void
 284 serial_puts_dev(int dev_index, const char *s)
 285 {
 286         _serial_puts(s, dev_index);
 287 }
 288 #else
 289 void
 290 serial_puts (const char *s)
 291 {
 292         _serial_puts(s, UART_NR);
 293 }
 294 #endif
 295
 296 #if defined(CONFIG_SERIAL_MULTI)
 297 DECLARE_S3C_SERIAL_FUNCTIONS(0);
 298 struct serial_device s3c24xx_serial0_device =
 299         INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
 300 DECLARE_S3C_SERIAL_FUNCTIONS(1);
 301 struct serial_device s3c24xx_serial1_device =
 302         INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
 303 DECLARE_S3C_SERIAL_FUNCTIONS(2);
 304 struct serial_device s3c24xx_serial2_device =
 305         INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");
 306
 307 #endif /* CONFIG_SERIAL_MULTI */
 308
 309 #endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) ||
 310           defined(CONFIG_S3C2440) || defined (CONFIG_S3C2442) ||
 311           defined (CONFIG_TRAB) */