drivers/serial/serial.c

   1 /*
   2  * (C) Copyright 2000
   3  * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 #include <ns16550.h>
  27 #ifdef CONFIG_NS87308
  28 #include <ns87308.h>
  29 #endif
  30
  31 #if defined (CONFIG_SERIAL_MULTI)
  32 #include <serial.h>
  33 #endif
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 #if !defined(CONFIG_CONS_INDEX)
  38 #if defined (CONFIG_SERIAL_MULTI)
  39 /*   with CONFIG_SERIAL_MULTI we might have no console
  40  *  on these devices
  41  */
  42 #else
  43 #error  "No console index specified."
  44 #endif /* CONFIG_SERIAL_MULTI */
  45 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4)
  46 #error  "Invalid console index value."
  47 #endif
  48
  49 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
  50 #error  "Console port 1 defined but not configured."
  51 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
  52 #error  "Console port 2 defined but not configured."
  53 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
  54 #error  "Console port 3 defined but not configured."
  55 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
  56 #error  "Console port 4 defined but not configured."
  57 #endif
  58
  59 /* Note: The port number specified in the functions is 1 based.
  60  *       the array is 0 based.
  61  */
  62 static NS16550_t serial_ports[4] = {
  63 #ifdef CONFIG_SYS_NS16550_COM1
  64         (NS16550_t)CONFIG_SYS_NS16550_COM1,
  65 #else
  66         NULL,
  67 #endif
  68 #ifdef CONFIG_SYS_NS16550_COM2
  69         (NS16550_t)CONFIG_SYS_NS16550_COM2,
  70 #else
  71         NULL,
  72 #endif
  73 #ifdef CONFIG_SYS_NS16550_COM3
  74         (NS16550_t)CONFIG_SYS_NS16550_COM3,
  75 #else
  76         NULL,
  77 #endif
  78 #ifdef CONFIG_SYS_NS16550_COM4
  79         (NS16550_t)CONFIG_SYS_NS16550_COM4
  80 #else
  81         NULL
  82 #endif
  83 };
  84
  85 #define PORT    serial_ports[port-1]
  86 #if defined(CONFIG_CONS_INDEX)
  87 #define CONSOLE (serial_ports[CONFIG_CONS_INDEX-1])
  88 #endif
  89
  90 #if defined(CONFIG_SERIAL_MULTI)
  91
  92 /* Multi serial device functions */
  93 #define DECLARE_ESERIAL_FUNCTIONS(port) \
  94     int  eserial##port##_init (void) {\
  95         int clock_divisor; \
  96         clock_divisor = calc_divisor(serial_ports[port-1]); \
  97         NS16550_init(serial_ports[port-1], clock_divisor); \
  98         return(0);}\
  99     void eserial##port##_setbrg (void) {\
 100         serial_setbrg_dev(port);}\
 101     int  eserial##port##_getc (void) {\
 102         return serial_getc_dev(port);}\
 103     int  eserial##port##_tstc (void) {\
 104         return serial_tstc_dev(port);}\
 105     void eserial##port##_putc (const char c) {\
 106         serial_putc_dev(port, c);}\
 107     void eserial##port##_puts (const char *s) {\
 108         serial_puts_dev(port, s);}
 109
 110 /* Serial device descriptor */
 111 #define INIT_ESERIAL_STRUCTURE(port,name,bus) {\
 112         name,\
 113         bus,\
 114         eserial##port##_init,\
 115         eserial##port##_setbrg,\
 116         eserial##port##_getc,\
 117         eserial##port##_tstc,\
 118         eserial##port##_putc,\
 119         eserial##port##_puts, }
 120
 121 #endif /* CONFIG_SERIAL_MULTI */
 122
 123 static int calc_divisor (NS16550_t port)
 124 {
 125 #ifdef CONFIG_OMAP1510
 126         /* If can't cleanly clock 115200 set div to 1 */
 127         if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
 128                 port->osc_12m_sel = OSC_12M_SEL;        /* enable 6.5 * divisor */
 129                 return (1);                             /* return 1 for base divisor */
 130         }
 131         port->osc_12m_sel = 0;                  /* clear if previsouly set */
 132 #endif
 133 #ifdef CONFIG_OMAP1610
 134         /* If can't cleanly clock 115200 set div to 1 */
 135         if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
 136                 return (26);            /* return 26 for base divisor */
 137         }
 138 #endif
 139
 140 #ifdef CONFIG_APTIX
 141 #define MODE_X_DIV 13
 142 #else
 143 #define MODE_X_DIV 16
 144 #endif
 145
 146         /* Compute divisor value. Normally, we should simply return:
 147          *   CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
 148          * but we need to round that value by adding 0.5.
 149          * Rounding is especially important at high baud rates.
 150          */
 151         return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
 152                 (MODE_X_DIV * gd->baudrate);
 153 }
 154
 155 #if !defined(CONFIG_SERIAL_MULTI)
 156 int serial_init (void)
 157 {
 158         int clock_divisor;
 159
 160 #ifdef CONFIG_NS87308
 161         initialise_ns87308();
 162 #endif
 163
 164 #ifdef CONFIG_SYS_NS16550_COM1
 165         clock_divisor = calc_divisor(serial_ports[0]);
 166         NS16550_init(serial_ports[0], clock_divisor);
 167 #endif
 168 #ifdef CONFIG_SYS_NS16550_COM2
 169         clock_divisor = calc_divisor(serial_ports[1]);
 170         NS16550_init(serial_ports[1], clock_divisor);
 171 #endif
 172 #ifdef CONFIG_SYS_NS16550_COM3
 173         clock_divisor = calc_divisor(serial_ports[2]);
 174         NS16550_init(serial_ports[2], clock_divisor);
 175 #endif
 176 #ifdef CONFIG_SYS_NS16550_COM4
 177         clock_divisor = calc_divisor(serial_ports[3]);
 178         NS16550_init(serial_ports[3], clock_divisor);
 179 #endif
 180
 181         return (0);
 182 }
 183 #endif
 184
 185 void
 186 _serial_putc(const char c,const int port)
 187 {
 188         if (c == '\n')
 189                 NS16550_putc(PORT, '\r');
 190
 191         NS16550_putc(PORT, c);
 192 }
 193
 194 void
 195 _serial_putc_raw(const char c,const int port)
 196 {
 197         NS16550_putc(PORT, c);
 198 }
 199
 200 void
 201 _serial_puts (const char *s,const int port)
 202 {
 203         while (*s) {
 204                 _serial_putc (*s++,port);
 205         }
 206 }
 207
 208
 209 int
 210 _serial_getc(const int port)
 211 {
 212         return NS16550_getc(PORT);
 213 }
 214
 215 int
 216 _serial_tstc(const int port)
 217 {
 218         return NS16550_tstc(PORT);
 219 }
 220
 221 void
 222 _serial_setbrg (const int port)
 223 {
 224         int clock_divisor;
 225
 226         clock_divisor = calc_divisor(PORT);
 227         NS16550_reinit(PORT, clock_divisor);
 228 }
 229
 230 #if defined(CONFIG_SERIAL_MULTI)
 231 static inline void
 232 serial_putc_dev(unsigned int dev_index,const char c)
 233 {
 234         _serial_putc(c,dev_index);
 235 }
 236 #else
 237 void
 238 serial_putc(const char c)
 239 {
 240         _serial_putc(c,CONFIG_CONS_INDEX);
 241 }
 242 #endif
 243
 244 #if defined(CONFIG_SERIAL_MULTI)
 245 static inline void
 246 serial_putc_raw_dev(unsigned int dev_index,const char c)
 247 {
 248         _serial_putc_raw(c,dev_index);
 249 }
 250 #else
 251 void
 252 serial_putc_raw(const char c)
 253 {
 254         _serial_putc_raw(c,CONFIG_CONS_INDEX);
 255 }
 256 #endif
 257
 258 #if defined(CONFIG_SERIAL_MULTI)
 259 static inline void
 260 serial_puts_dev(unsigned int dev_index,const char *s)
 261 {
 262         _serial_puts(s,dev_index);
 263 }
 264 #else
 265 void
 266 serial_puts(const char *s)
 267 {
 268         _serial_puts(s,CONFIG_CONS_INDEX);
 269 }
 270 #endif
 271
 272 #if defined(CONFIG_SERIAL_MULTI)
 273 static inline int
 274 serial_getc_dev(unsigned int dev_index)
 275 {
 276         return _serial_getc(dev_index);
 277 }
 278 #else
 279 int
 280 serial_getc(void)
 281 {
 282         return _serial_getc(CONFIG_CONS_INDEX);
 283 }
 284 #endif
 285
 286 #if defined(CONFIG_SERIAL_MULTI)
 287 static inline int
 288 serial_tstc_dev(unsigned int dev_index)
 289 {
 290         return _serial_tstc(dev_index);
 291 }
 292 #else
 293 int
 294 serial_tstc(void)
 295 {
 296         return _serial_tstc(CONFIG_CONS_INDEX);
 297 }
 298 #endif
 299
 300 #if defined(CONFIG_SERIAL_MULTI)
 301 static inline void
 302 serial_setbrg_dev(unsigned int dev_index)
 303 {
 304         _serial_setbrg(dev_index);
 305 }
 306 #else
 307 void
 308 serial_setbrg(void)
 309 {
 310         _serial_setbrg(CONFIG_CONS_INDEX);
 311 }
 312 #endif
 313
 314 #if defined(CONFIG_SERIAL_MULTI)
 315
 316 DECLARE_ESERIAL_FUNCTIONS(1);
 317 struct serial_device eserial1_device =
 318         INIT_ESERIAL_STRUCTURE(1,"eserial0","EUART1");
 319 DECLARE_ESERIAL_FUNCTIONS(2);
 320 struct serial_device eserial2_device =
 321         INIT_ESERIAL_STRUCTURE(2,"eserial1","EUART2");
 322 DECLARE_ESERIAL_FUNCTIONS(3);
 323 struct serial_device eserial3_device =
 324         INIT_ESERIAL_STRUCTURE(3,"eserial2","EUART3");
 325 DECLARE_ESERIAL_FUNCTIONS(4);
 326 struct serial_device eserial4_device =
 327         INIT_ESERIAL_STRUCTURE(4,"eserial3","EUART4");
 328 #endif /* CONFIG_SERIAL_MULTI */