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 #include <serial.h> 33 34 DECLARE_GLOBAL_DATA_PTR; 35 36 #if !defined(CONFIG_CONS_INDEX) 37 #elif (CONFIG_CONS_INDEX < 1) || (CONFIG_CONS_INDEX > 4) 38 #error "Invalid console index value." 39 #endif 40 41 #if CONFIG_CONS_INDEX == 1 && !defined(CONFIG_SYS_NS16550_COM1) 42 #error "Console port 1 defined but not configured." 43 #elif CONFIG_CONS_INDEX == 2 && !defined(CONFIG_SYS_NS16550_COM2) 44 #error "Console port 2 defined but not configured." 45 #elif CONFIG_CONS_INDEX == 3 && !defined(CONFIG_SYS_NS16550_COM3) 46 #error "Console port 3 defined but not configured." 47 #elif CONFIG_CONS_INDEX == 4 && !defined(CONFIG_SYS_NS16550_COM4) 48 #error "Console port 4 defined but not configured." 49 #endif 50 51 /* Note: The port number specified in the functions is 1 based. 52 * the array is 0 based. 53 */ 54 static NS16550_t serial_ports[4] = { 55 #ifdef CONFIG_SYS_NS16550_COM1 56 (NS16550_t)CONFIG_SYS_NS16550_COM1, 57 #else 58 NULL, 59 #endif 60 #ifdef CONFIG_SYS_NS16550_COM2 61 (NS16550_t)CONFIG_SYS_NS16550_COM2, 62 #else 63 NULL, 64 #endif 65 #ifdef CONFIG_SYS_NS16550_COM3 66 (NS16550_t)CONFIG_SYS_NS16550_COM3, 67 #else 68 NULL, 69 #endif 70 #ifdef CONFIG_SYS_NS16550_COM4 71 (NS16550_t)CONFIG_SYS_NS16550_COM4 72 #else 73 NULL 74 #endif 75 }; 76 77 #define PORT serial_ports[port-1] 78 79 /* Multi serial device functions */ 80 #define DECLARE_ESERIAL_FUNCTIONS(port) \ 81 static int eserial##port##_init(void) \ 82 { \ 83 int clock_divisor; \ 84 clock_divisor = calc_divisor(serial_ports[port-1]); \ 85 NS16550_init(serial_ports[port-1], clock_divisor); \ 86 return 0 ; \ 87 } \ 88 static void eserial##port##_setbrg(void) \ 89 { \ 90 serial_setbrg_dev(port); \ 91 } \ 92 static int eserial##port##_getc(void) \ 93 { \ 94 return serial_getc_dev(port); \ 95 } \ 96 static int eserial##port##_tstc(void) \ 97 { \ 98 return serial_tstc_dev(port); \ 99 } \ 100 static void eserial##port##_putc(const char c) \ 101 { \ 102 serial_putc_dev(port, c); \ 103 } \ 104 static void eserial##port##_puts(const char *s) \ 105 { \ 106 serial_puts_dev(port, s); \ 107 } 108 109 /* Serial device descriptor */ 110 #define INIT_ESERIAL_STRUCTURE(port, __name) { \ 111 .name = __name, \ 112 .start = eserial##port##_init, \ 113 .stop = NULL, \ 114 .setbrg = eserial##port##_setbrg, \ 115 .getc = eserial##port##_getc, \ 116 .tstc = eserial##port##_tstc, \ 117 .putc = eserial##port##_putc, \ 118 .puts = eserial##port##_puts, \ 119 } 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 void 154 _serial_putc(const char c,const int port) 155 { 156 if (c == '\n') 157 NS16550_putc(PORT, '\r'); 158 159 NS16550_putc(PORT, c); 160 } 161 162 void 163 _serial_putc_raw(const char c,const int port) 164 { 165 NS16550_putc(PORT, c); 166 } 167 168 void 169 _serial_puts (const char *s,const int port) 170 { 171 while (*s) { 172 _serial_putc (*s++,port); 173 } 174 } 175 176 177 int 178 _serial_getc(const int port) 179 { 180 return NS16550_getc(PORT); 181 } 182 183 int 184 _serial_tstc(const int port) 185 { 186 return NS16550_tstc(PORT); 187 } 188 189 void 190 _serial_setbrg (const int port) 191 { 192 int clock_divisor; 193 194 clock_divisor = calc_divisor(PORT); 195 NS16550_reinit(PORT, clock_divisor); 196 } 197 198 static inline void 199 serial_putc_dev(unsigned int dev_index,const char c) 200 { 201 _serial_putc(c,dev_index); 202 } 203 204 static inline void 205 serial_putc_raw_dev(unsigned int dev_index,const char c) 206 { 207 _serial_putc_raw(c,dev_index); 208 } 209 210 static inline void 211 serial_puts_dev(unsigned int dev_index,const char *s) 212 { 213 _serial_puts(s,dev_index); 214 } 215 216 static inline int 217 serial_getc_dev(unsigned int dev_index) 218 { 219 return _serial_getc(dev_index); 220 } 221 222 static inline int 223 serial_tstc_dev(unsigned int dev_index) 224 { 225 return _serial_tstc(dev_index); 226 } 227 228 static inline void 229 serial_setbrg_dev(unsigned int dev_index) 230 { 231 _serial_setbrg(dev_index); 232 } 233 234 DECLARE_ESERIAL_FUNCTIONS(1); 235 struct serial_device eserial1_device = 236 INIT_ESERIAL_STRUCTURE(1, "eserial0"); 237 DECLARE_ESERIAL_FUNCTIONS(2); 238 struct serial_device eserial2_device = 239 INIT_ESERIAL_STRUCTURE(2, "eserial1"); 240 DECLARE_ESERIAL_FUNCTIONS(3); 241 struct serial_device eserial3_device = 242 INIT_ESERIAL_STRUCTURE(3, "eserial2"); 243 DECLARE_ESERIAL_FUNCTIONS(4); 244 struct serial_device eserial4_device = 245 INIT_ESERIAL_STRUCTURE(4, "eserial3"); 246 247 __weak struct serial_device *default_serial_console(void) 248 { 249 #if CONFIG_CONS_INDEX == 1 250 return &eserial1_device; 251 #elif CONFIG_CONS_INDEX == 2 252 return &eserial2_device; 253 #elif CONFIG_CONS_INDEX == 3 254 return &eserial3_device; 255 #elif CONFIG_CONS_INDEX == 4 256 return &eserial4_device; 257 #else 258 #error "Bad CONFIG_CONS_INDEX." 259 #endif 260 } 261 262 void ns16550_serial_initialize(void) 263 { 264 #if defined(CONFIG_SYS_NS16550_COM1) 265 serial_register(&eserial1_device); 266 #endif 267 #if defined(CONFIG_SYS_NS16550_COM2) 268 serial_register(&eserial2_device); 269 #endif 270 #if defined(CONFIG_SYS_NS16550_COM3) 271 serial_register(&eserial3_device); 272 #endif 273 #if defined(CONFIG_SYS_NS16550_COM4) 274 serial_register(&eserial4_device); 275 #endif 276 } 277