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 = __name, \ 111 .start = eserial##port##_init, \ 112 .stop = NULL, \ 113 .setbrg = eserial##port##_setbrg, \ 114 .getc = eserial##port##_getc, \ 115 .tstc = eserial##port##_tstc, \ 116 .putc = eserial##port##_putc, \ 117 .puts = eserial##port##_puts, \ 118 } 119 120 #endif /* CONFIG_SERIAL_MULTI */ 121 122 static int calc_divisor (NS16550_t port) 123 { 124 #ifdef CONFIG_OMAP1510 125 /* If can't cleanly clock 115200 set div to 1 */ 126 if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) { 127 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */ 128 return (1); /* return 1 for base divisor */ 129 } 130 port->osc_12m_sel = 0; /* clear if previsouly set */ 131 #endif 132 #ifdef CONFIG_OMAP1610 133 /* If can't cleanly clock 115200 set div to 1 */ 134 if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) { 135 return (26); /* return 26 for base divisor */ 136 } 137 #endif 138 139 #ifdef CONFIG_APTIX 140 #define MODE_X_DIV 13 141 #else 142 #define MODE_X_DIV 16 143 #endif 144 145 /* Compute divisor value. Normally, we should simply return: 146 * CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate 147 * but we need to round that value by adding 0.5. 148 * Rounding is especially important at high baud rates. 149 */ 150 return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) / 151 (MODE_X_DIV * gd->baudrate); 152 } 153 154 #if !defined(CONFIG_SERIAL_MULTI) 155 int serial_init (void) 156 { 157 int clock_divisor; 158 159 #ifdef CONFIG_NS87308 160 initialise_ns87308(); 161 #endif 162 163 #ifdef CONFIG_SYS_NS16550_COM1 164 clock_divisor = calc_divisor(serial_ports[0]); 165 NS16550_init(serial_ports[0], clock_divisor); 166 #endif 167 #ifdef CONFIG_SYS_NS16550_COM2 168 clock_divisor = calc_divisor(serial_ports[1]); 169 NS16550_init(serial_ports[1], clock_divisor); 170 #endif 171 #ifdef CONFIG_SYS_NS16550_COM3 172 clock_divisor = calc_divisor(serial_ports[2]); 173 NS16550_init(serial_ports[2], clock_divisor); 174 #endif 175 #ifdef CONFIG_SYS_NS16550_COM4 176 clock_divisor = calc_divisor(serial_ports[3]); 177 NS16550_init(serial_ports[3], clock_divisor); 178 #endif 179 180 return (0); 181 } 182 #endif 183 184 void 185 _serial_putc(const char c,const int port) 186 { 187 if (c == '\n') 188 NS16550_putc(PORT, '\r'); 189 190 NS16550_putc(PORT, c); 191 } 192 193 void 194 _serial_putc_raw(const char c,const int port) 195 { 196 NS16550_putc(PORT, c); 197 } 198 199 void 200 _serial_puts (const char *s,const int port) 201 { 202 while (*s) { 203 _serial_putc (*s++,port); 204 } 205 } 206 207 208 int 209 _serial_getc(const int port) 210 { 211 return NS16550_getc(PORT); 212 } 213 214 int 215 _serial_tstc(const int port) 216 { 217 return NS16550_tstc(PORT); 218 } 219 220 void 221 _serial_setbrg (const int port) 222 { 223 int clock_divisor; 224 225 clock_divisor = calc_divisor(PORT); 226 NS16550_reinit(PORT, clock_divisor); 227 } 228 229 #if defined(CONFIG_SERIAL_MULTI) 230 static inline void 231 serial_putc_dev(unsigned int dev_index,const char c) 232 { 233 _serial_putc(c,dev_index); 234 } 235 #else 236 void 237 serial_putc(const char c) 238 { 239 _serial_putc(c,CONFIG_CONS_INDEX); 240 } 241 #endif 242 243 #if defined(CONFIG_SERIAL_MULTI) 244 static inline void 245 serial_putc_raw_dev(unsigned int dev_index,const char c) 246 { 247 _serial_putc_raw(c,dev_index); 248 } 249 #else 250 void 251 serial_putc_raw(const char c) 252 { 253 _serial_putc_raw(c,CONFIG_CONS_INDEX); 254 } 255 #endif 256 257 #if defined(CONFIG_SERIAL_MULTI) 258 static inline void 259 serial_puts_dev(unsigned int dev_index,const char *s) 260 { 261 _serial_puts(s,dev_index); 262 } 263 #else 264 void 265 serial_puts(const char *s) 266 { 267 _serial_puts(s,CONFIG_CONS_INDEX); 268 } 269 #endif 270 271 #if defined(CONFIG_SERIAL_MULTI) 272 static inline int 273 serial_getc_dev(unsigned int dev_index) 274 { 275 return _serial_getc(dev_index); 276 } 277 #else 278 int 279 serial_getc(void) 280 { 281 return _serial_getc(CONFIG_CONS_INDEX); 282 } 283 #endif 284 285 #if defined(CONFIG_SERIAL_MULTI) 286 static inline int 287 serial_tstc_dev(unsigned int dev_index) 288 { 289 return _serial_tstc(dev_index); 290 } 291 #else 292 int 293 serial_tstc(void) 294 { 295 return _serial_tstc(CONFIG_CONS_INDEX); 296 } 297 #endif 298 299 #if defined(CONFIG_SERIAL_MULTI) 300 static inline void 301 serial_setbrg_dev(unsigned int dev_index) 302 { 303 _serial_setbrg(dev_index); 304 } 305 #else 306 void 307 serial_setbrg(void) 308 { 309 _serial_setbrg(CONFIG_CONS_INDEX); 310 } 311 #endif 312 313 #if defined(CONFIG_SERIAL_MULTI) 314 315 DECLARE_ESERIAL_FUNCTIONS(1); 316 struct serial_device eserial1_device = 317 INIT_ESERIAL_STRUCTURE(1, "eserial0"); 318 DECLARE_ESERIAL_FUNCTIONS(2); 319 struct serial_device eserial2_device = 320 INIT_ESERIAL_STRUCTURE(2, "eserial1"); 321 DECLARE_ESERIAL_FUNCTIONS(3); 322 struct serial_device eserial3_device = 323 INIT_ESERIAL_STRUCTURE(3, "eserial2"); 324 DECLARE_ESERIAL_FUNCTIONS(4); 325 struct serial_device eserial4_device = 326 INIT_ESERIAL_STRUCTURE(4, "eserial3"); 327 328 __weak struct serial_device *default_serial_console(void) 329 { 330 #if CONFIG_CONS_INDEX == 1 331 return &eserial1_device; 332 #elif CONFIG_CONS_INDEX == 2 333 return &eserial2_device; 334 #elif CONFIG_CONS_INDEX == 3 335 return &eserial3_device; 336 #elif CONFIG_CONS_INDEX == 4 337 return &eserial4_device; 338 #else 339 #error "Bad CONFIG_CONS_INDEX." 340 #endif 341 } 342 343 #endif /* CONFIG_SERIAL_MULTI */ 344