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 */ 343