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 #ifdef CONFIG_KIRKWOOD
  31 #include <asm/arch/kirkwood.h>
  32 #endif
  33
  34 #if defined (CONFIG_SERIAL_MULTI)
  35 #include <serial.h>
  36 #endif
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 #if !defined(CONFIG_CONS_INDEX)
  41 #if defined (CONFIG_SERIAL_MULTI)
  42 /*   with CONFIG_SERIAL_MULTI we might have no console
  43  *  on these devices
  44  */
  45 #else
  46 #error  "No console index specified."
  47 #endif /* CONFIG_SERIAL_MULTI */
  48 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4)
  49 #error  "Invalid console index value."
  50 #endif
  51
  52 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1)
  53 #error  "Console port 1 defined but not configured."
  54 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2)
  55 #error  "Console port 2 defined but not configured."
  56 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3)
  57 #error  "Console port 3 defined but not configured."
  58 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4)
  59 #error  "Console port 4 defined but not configured."
  60 #endif
  61
  62 /* Note: The port number specified in the functions is 1 based.
  63  *       the array is 0 based.
  64  */
  65 static NS16550_t serial_ports[4] = {
  66 #ifdef CONFIG_SYS_NS16550_COM1
  67         (NS16550_t)CONFIG_SYS_NS16550_COM1,
  68 #else
  69         NULL,
  70 #endif
  71 #ifdef CONFIG_SYS_NS16550_COM2
  72         (NS16550_t)CONFIG_SYS_NS16550_COM2,
  73 #else
  74         NULL,
  75 #endif
  76 #ifdef CONFIG_SYS_NS16550_COM3
  77         (NS16550_t)CONFIG_SYS_NS16550_COM3,
  78 #else
  79         NULL,
  80 #endif
  81 #ifdef CONFIG_SYS_NS16550_COM4
  82         (NS16550_t)CONFIG_SYS_NS16550_COM4
  83 #else
  84         NULL
  85 #endif
  86 };
  87
  88 #define PORT    serial_ports[port-1]
  89 #if defined(CONFIG_CONS_INDEX)
  90 #define CONSOLE (serial_ports[CONFIG_CONS_INDEX-1])
  91 #endif
  92
  93 #if defined(CONFIG_SERIAL_MULTI)
  94
  95 /* Multi serial device functions */
  96 #define DECLARE_ESERIAL_FUNCTIONS(port) \
  97     int  eserial##port##_init (void) {\
  98         int clock_divisor; \
  99         clock_divisor = calc_divisor(serial_ports[port-1]); \
 100         NS16550_init(serial_ports[port-1], clock_divisor); \
 101         return(0);}\
 102     void eserial##port##_setbrg (void) {\
 103         serial_setbrg_dev(port);}\
 104     int  eserial##port##_getc (void) {\
 105         return serial_getc_dev(port);}\
 106     int  eserial##port##_tstc (void) {\
 107         return serial_tstc_dev(port);}\
 108     void eserial##port##_putc (const char c) {\
 109         serial_putc_dev(port, c);}\
 110     void eserial##port##_puts (const char *s) {\
 111         serial_puts_dev(port, s);}
 112
 113 /* Serial device descriptor */
 114 #define INIT_ESERIAL_STRUCTURE(port,name,bus) {\
 115         name,\
 116         bus,\
 117         eserial##port##_init,\
 118         NULL,\
 119         eserial##port##_setbrg,\
 120         eserial##port##_getc,\
 121         eserial##port##_tstc,\
 122         eserial##port##_putc,\
 123         eserial##port##_puts, }
 124
 125 #endif /* CONFIG_SERIAL_MULTI */
 126
 127 static int calc_divisor (NS16550_t port)
 128 {
 129 #ifdef CONFIG_OMAP1510
 130         /* If can't cleanly clock 115200 set div to 1 */
 131         if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
 132                 port->osc_12m_sel = OSC_12M_SEL;        /* enable 6.5 * divisor */
 133                 return (1);                             /* return 1 for base divisor */
 134         }
 135         port->osc_12m_sel = 0;                  /* clear if previsouly set */
 136 #endif
 137 #ifdef CONFIG_OMAP1610
 138         /* If can't cleanly clock 115200 set div to 1 */
 139         if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) {
 140                 return (26);            /* return 26 for base divisor */
 141         }
 142 #endif
 143
 144 #ifdef CONFIG_APTIX
 145 #define MODE_X_DIV 13
 146 #else
 147 #define MODE_X_DIV 16
 148 #endif
 149
 150         /* Compute divisor value. Normally, we should simply return:
 151          *   CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
 152          * but we need to round that value by adding 0.5.
 153          * Rounding is especially important at high baud rates.
 154          */
 155         return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
 156                 (MODE_X_DIV * gd->baudrate);
 157 }
 158
 159 #if !defined(CONFIG_SERIAL_MULTI)
 160 int serial_init (void)
 161 {
 162         int clock_divisor;
 163
 164 #ifdef CONFIG_NS87308
 165         initialise_ns87308();
 166 #endif
 167
 168 #ifdef CONFIG_SYS_NS16550_COM1
 169         clock_divisor = calc_divisor(serial_ports[0]);
 170         NS16550_init(serial_ports[0], clock_divisor);
 171 #endif
 172 #ifdef CONFIG_SYS_NS16550_COM2
 173         clock_divisor = calc_divisor(serial_ports[1]);
 174         NS16550_init(serial_ports[1], clock_divisor);
 175 #endif
 176 #ifdef CONFIG_SYS_NS16550_COM3
 177         clock_divisor = calc_divisor(serial_ports[2]);
 178         NS16550_init(serial_ports[2], clock_divisor);
 179 #endif
 180 #ifdef CONFIG_SYS_NS16550_COM4
 181         clock_divisor = calc_divisor(serial_ports[3]);
 182         NS16550_init(serial_ports[3], clock_divisor);
 183 #endif
 184
 185         return (0);
 186 }
 187 #endif
 188
 189 void
 190 _serial_putc(const char c,const int port)
 191 {
 192         if (c == '\n')
 193                 NS16550_putc(PORT, '\r');
 194
 195         NS16550_putc(PORT, c);
 196 }
 197
 198 void
 199 _serial_putc_raw(const char c,const int port)
 200 {
 201         NS16550_putc(PORT, c);
 202 }
 203
 204 void
 205 _serial_puts (const char *s,const int port)
 206 {
 207         while (*s) {
 208                 _serial_putc (*s++,port);
 209         }
 210 }
 211
 212
 213 int
 214 _serial_getc(const int port)
 215 {
 216         return NS16550_getc(PORT);
 217 }
 218
 219 int
 220 _serial_tstc(const int port)
 221 {
 222         return NS16550_tstc(PORT);
 223 }
 224
 225 void
 226 _serial_setbrg (const int port)
 227 {
 228         int clock_divisor;
 229
 230         clock_divisor = calc_divisor(PORT);
 231         NS16550_reinit(PORT, clock_divisor);
 232 }
 233
 234 #if defined(CONFIG_SERIAL_MULTI)
 235 static inline void
 236 serial_putc_dev(unsigned int dev_index,const char c)
 237 {
 238         _serial_putc(c,dev_index);
 239 }
 240 #else
 241 void
 242 serial_putc(const char c)
 243 {
 244         _serial_putc(c,CONFIG_CONS_INDEX);
 245 }
 246 #endif
 247
 248 #if defined(CONFIG_SERIAL_MULTI)
 249 static inline void
 250 serial_putc_raw_dev(unsigned int dev_index,const char c)
 251 {
 252         _serial_putc_raw(c,dev_index);
 253 }
 254 #else
 255 void
 256 serial_putc_raw(const char c)
 257 {
 258         _serial_putc_raw(c,CONFIG_CONS_INDEX);
 259 }
 260 #endif
 261
 262 #if defined(CONFIG_SERIAL_MULTI)
 263 static inline void
 264 serial_puts_dev(unsigned int dev_index,const char *s)
 265 {
 266         _serial_puts(s,dev_index);
 267 }
 268 #else
 269 void
 270 serial_puts(const char *s)
 271 {
 272         _serial_puts(s,CONFIG_CONS_INDEX);
 273 }
 274 #endif
 275
 276 #if defined(CONFIG_SERIAL_MULTI)
 277 static inline int
 278 serial_getc_dev(unsigned int dev_index)
 279 {
 280         return _serial_getc(dev_index);
 281 }
 282 #else
 283 int
 284 serial_getc(void)
 285 {
 286         return _serial_getc(CONFIG_CONS_INDEX);
 287 }
 288 #endif
 289
 290 #if defined(CONFIG_SERIAL_MULTI)
 291 static inline int
 292 serial_tstc_dev(unsigned int dev_index)
 293 {
 294         return _serial_tstc(dev_index);
 295 }
 296 #else
 297 int
 298 serial_tstc(void)
 299 {
 300         return _serial_tstc(CONFIG_CONS_INDEX);
 301 }
 302 #endif
 303
 304 #if defined(CONFIG_SERIAL_MULTI)
 305 static inline void
 306 serial_setbrg_dev(unsigned int dev_index)
 307 {
 308         _serial_setbrg(dev_index);
 309 }
 310 #else
 311 void
 312 serial_setbrg(void)
 313 {
 314         _serial_setbrg(CONFIG_CONS_INDEX);
 315 }
 316 #endif
 317
 318 #if defined(CONFIG_SERIAL_MULTI)
 319
 320 DECLARE_ESERIAL_FUNCTIONS(1);
 321 struct serial_device eserial1_device =
 322         INIT_ESERIAL_STRUCTURE(1,"eserial0","EUART1");
 323 DECLARE_ESERIAL_FUNCTIONS(2);
 324 struct serial_device eserial2_device =
 325         INIT_ESERIAL_STRUCTURE(2,"eserial1","EUART2");
 326 DECLARE_ESERIAL_FUNCTIONS(3);
 327 struct serial_device eserial3_device =
 328         INIT_ESERIAL_STRUCTURE(3,"eserial2","EUART3");
 329 DECLARE_ESERIAL_FUNCTIONS(4);
 330 struct serial_device eserial4_device =
 331         INIT_ESERIAL_STRUCTURE(4,"eserial3","EUART4");
 332 #endif /* CONFIG_SERIAL_MULTI */