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 #include <linux/compiler.h>
  26
  27 #include <ns16550.h>
  28 #ifdef CONFIG_NS87308
  29 #include <ns87308.h>
  30 #endif
  31
  32 #if defined (CONFIG_SERIAL_MULTI)
  33 #include <serial.h>
  34 #endif
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 #if !defined(CONFIG_CONS_INDEX)
  39 #if defined (CONFIG_SERIAL_MULTI)
  40 /*   with CONFIG_SERIAL_MULTI we might have no console
  41  *  on these devices
  42  */
  43 #else
  44 #error  "No console index specified."
  45 #endif /* CONFIG_SERIAL_MULTI */
  46 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4)
  47 #error  "Invalid console index value."
  48 #endif
  49
  50 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
  51 #error  "Console port 1 defined but not configured."
  52 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
  53 #error  "Console port 2 defined but not configured."
  54 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
  55 #error  "Console port 3 defined but not configured."
  56 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
  57 #error  "Console port 4 defined but not configured."
  58 #endif
  59
  60 /* Note: The port number specified in the functions is 1 based.
  61  *       the array is 0 based.
  62  */
  63 static NS16550_t serial_ports[4] = {
  64 #ifdef CONFIG_SYS_NS16550_COM1
  65         (NS16550_t)CONFIG_SYS_NS16550_COM1,
  66 #else
  67         NULL,
  68 #endif
  69 #ifdef CONFIG_SYS_NS16550_COM2
  70         (NS16550_t)CONFIG_SYS_NS16550_COM2,
  71 #else
  72         NULL,
  73 #endif
  74 #ifdef CONFIG_SYS_NS16550_COM3
  75         (NS16550_t)CONFIG_SYS_NS16550_COM3,
  76 #else
  77         NULL,
  78 #endif
  79 #ifdef CONFIG_SYS_NS16550_COM4
  80         (NS16550_t)CONFIG_SYS_NS16550_COM4
  81 #else
  82         NULL
  83 #endif
  84 };
  85
  86 #define PORT    serial_ports[port-1]
  87
  88 #if defined(CONFIG_SERIAL_MULTI)
  89
  90 /* Multi serial device functions */
  91 #define DECLARE_ESERIAL_FUNCTIONS(port) \
  92     int  eserial##port##_init (void) {\
  93         int clock_divisor; \
  94         clock_divisor = calc_divisor(serial_ports[port-1]); \
  95         NS16550_init(serial_ports[port-1], clock_divisor); \
  96         return(0);}\
  97     void eserial##port##_setbrg (void) {\
  98         serial_setbrg_dev(port);}\
  99     int  eserial##port##_getc (void) {\
 100         return serial_getc_dev(port);}\
 101     int  eserial##port##_tstc (void) {\
 102         return serial_tstc_dev(port);}\
 103     void eserial##port##_putc (const char c) {\
 104         serial_putc_dev(port, c);}\
 105     void eserial##port##_puts (const char *s) {\
 106         serial_puts_dev(port, s);}
 107
 108 /* Serial device descriptor */
 109 #define INIT_ESERIAL_STRUCTURE(port, name) {\
 110         name,\
 111         eserial##port##_init,\
 112         NULL,\
 113         eserial##port##_setbrg,\
 114         eserial##port##_getc,\
 115         eserial##port##_tstc,\
 116         eserial##port##_putc,\
 117         eserial##port##_puts, }
 118
 119 #endif /* CONFIG_SERIAL_MULTI */
 120
 121 static int calc_divisor (NS16550_t port)
 122 {
 123 #ifdef CONFIG_OMAP1510
 124         /* If can't cleanly clock 115200 set div to 1 */
 125         if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
 126                 port->osc_12m_sel = OSC_12M_SEL;        /* enable 6.5 * divisor */
 127                 return (1);                             /* return 1 for base divisor */
 128         }
 129         port->osc_12m_sel = 0;                  /* clear if previsouly set */
 130 #endif
 131 #ifdef CONFIG_OMAP1610
 132         /* If can't cleanly clock 115200 set div to 1 */
 133         if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
 134                 return (26);            /* return 26 for base divisor */
 135         }
 136 #endif
 137
 138 #ifdef CONFIG_APTIX
 139 #define MODE_X_DIV 13
 140 #else
 141 #define MODE_X_DIV 16
 142 #endif
 143
 144         /* Compute divisor value. Normally, we should simply return:
 145          *   CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
 146          * but we need to round that value by adding 0.5.
 147          * Rounding is especially important at high baud rates.
 148          */
 149         return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
 150                 (MODE_X_DIV * gd->baudrate);
 151 }
 152
 153 #if !defined(CONFIG_SERIAL_MULTI)
 154 int serial_init (void)
 155 {
 156         int clock_divisor;
 157
 158 #ifdef CONFIG_NS87308
 159         initialise_ns87308();
 160 #endif
 161
 162 #ifdef CONFIG_SYS_NS16550_COM1
 163         clock_divisor = calc_divisor(serial_ports[0]);
 164         NS16550_init(serial_ports[0], clock_divisor);
 165 #endif
 166 #ifdef CONFIG_SYS_NS16550_COM2
 167         clock_divisor = calc_divisor(serial_ports[1]);
 168         NS16550_init(serial_ports[1], clock_divisor);
 169 #endif
 170 #ifdef CONFIG_SYS_NS16550_COM3
 171         clock_divisor = calc_divisor(serial_ports[2]);
 172         NS16550_init(serial_ports[2], clock_divisor);
 173 #endif
 174 #ifdef CONFIG_SYS_NS16550_COM4
 175         clock_divisor = calc_divisor(serial_ports[3]);
 176         NS16550_init(serial_ports[3], clock_divisor);
 177 #endif
 178
 179         return (0);
 180 }
 181 #endif
 182
 183 void
 184 _serial_putc(const char c,const int port)
 185 {
 186         if (c == '\n')
 187                 NS16550_putc(PORT, '\r');
 188
 189         NS16550_putc(PORT, c);
 190 }
 191
 192 void
 193 _serial_putc_raw(const char c,const int port)
 194 {
 195         NS16550_putc(PORT, c);
 196 }
 197
 198 void
 199 _serial_puts (const char *s,const int port)
 200 {
 201         while (*s) {
 202                 _serial_putc (*s++,port);
 203         }
 204 }
 205
 206
 207 int
 208 _serial_getc(const int port)
 209 {
 210         return NS16550_getc(PORT);
 211 }
 212
 213 int
 214 _serial_tstc(const int port)
 215 {
 216         return NS16550_tstc(PORT);
 217 }
 218
 219 void
 220 _serial_setbrg (const int port)
 221 {
 222         int clock_divisor;
 223
 224         clock_divisor = calc_divisor(PORT);
 225         NS16550_reinit(PORT, clock_divisor);
 226 }
 227
 228 #if defined(CONFIG_SERIAL_MULTI)
 229 static inline void
 230 serial_putc_dev(unsigned int dev_index,const char c)
 231 {
 232         _serial_putc(c,dev_index);
 233 }
 234 #else
 235 void
 236 serial_putc(const char c)
 237 {
 238         _serial_putc(c,CONFIG_CONS_INDEX);
 239 }
 240 #endif
 241
 242 #if defined(CONFIG_SERIAL_MULTI)
 243 static inline void
 244 serial_putc_raw_dev(unsigned int dev_index,const char c)
 245 {
 246         _serial_putc_raw(c,dev_index);
 247 }
 248 #else
 249 void
 250 serial_putc_raw(const char c)
 251 {
 252         _serial_putc_raw(c,CONFIG_CONS_INDEX);
 253 }
 254 #endif
 255
 256 #if defined(CONFIG_SERIAL_MULTI)
 257 static inline void
 258 serial_puts_dev(unsigned int dev_index,const char *s)
 259 {
 260         _serial_puts(s,dev_index);
 261 }
 262 #else
 263 void
 264 serial_puts(const char *s)
 265 {
 266         _serial_puts(s,CONFIG_CONS_INDEX);
 267 }
 268 #endif
 269
 270 #if defined(CONFIG_SERIAL_MULTI)
 271 static inline int
 272 serial_getc_dev(unsigned int dev_index)
 273 {
 274         return _serial_getc(dev_index);
 275 }
 276 #else
 277 int
 278 serial_getc(void)
 279 {
 280         return _serial_getc(CONFIG_CONS_INDEX);
 281 }
 282 #endif
 283
 284 #if defined(CONFIG_SERIAL_MULTI)
 285 static inline int
 286 serial_tstc_dev(unsigned int dev_index)
 287 {
 288         return _serial_tstc(dev_index);
 289 }
 290 #else
 291 int
 292 serial_tstc(void)
 293 {
 294         return _serial_tstc(CONFIG_CONS_INDEX);
 295 }
 296 #endif
 297
 298 #if defined(CONFIG_SERIAL_MULTI)
 299 static inline void
 300 serial_setbrg_dev(unsigned int dev_index)
 301 {
 302         _serial_setbrg(dev_index);
 303 }
 304 #else
 305 void
 306 serial_setbrg(void)
 307 {
 308         _serial_setbrg(CONFIG_CONS_INDEX);
 309 }
 310 #endif
 311
 312 #if defined(CONFIG_SERIAL_MULTI)
 313
 314 DECLARE_ESERIAL_FUNCTIONS(1);
 315 struct serial_device eserial1_device =
 316         INIT_ESERIAL_STRUCTURE(1, "eserial0");
 317 DECLARE_ESERIAL_FUNCTIONS(2);
 318 struct serial_device eserial2_device =
 319         INIT_ESERIAL_STRUCTURE(2, "eserial1");
 320 DECLARE_ESERIAL_FUNCTIONS(3);
 321 struct serial_device eserial3_device =
 322         INIT_ESERIAL_STRUCTURE(3, "eserial2");
 323 DECLARE_ESERIAL_FUNCTIONS(4);
 324 struct serial_device eserial4_device =
 325         INIT_ESERIAL_STRUCTURE(4, "eserial3");
 326
 327 __weak struct serial_device *default_serial_console(void)
 328 {
 329 #if CONFIG_CONS_INDEX == 1
 330         return &eserial1_device;
 331 #elif CONFIG_CONS_INDEX == 2
 332         return &eserial2_device;
 333 #elif CONFIG_CONS_INDEX == 3
 334         return &eserial3_device;
 335 #elif CONFIG_CONS_INDEX == 4
 336         return &eserial4_device;
 337 #else
 338 #error "Bad CONFIG_CONS_INDEX."
 339 #endif
 340 }
 341
 342 #endif /* CONFIG_SERIAL_MULTI */