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 int eserial##port##_init (void) {\ 82 int clock_divisor; \ 83 clock_divisor = calc_divisor(serial_ports[port-1]); \ 84 NS16550_init(serial_ports[port-1], clock_divisor); \ 85 return(0);}\ 86 void eserial##port##_setbrg (void) {\ 87 serial_setbrg_dev(port);}\ 88 int eserial##port##_getc (void) {\ 89 return serial_getc_dev(port);}\ 90 int eserial##port##_tstc (void) {\ 91 return serial_tstc_dev(port);}\ 92 void eserial##port##_putc (const char c) {\ 93 serial_putc_dev(port, c);}\ 94 void eserial##port##_puts (const char *s) {\ 95 serial_puts_dev(port, s);} 96 97 /* Serial device descriptor */ 98 #define INIT_ESERIAL_STRUCTURE(port, __name) { \ 99 .name = __name, \ 100 .start = eserial##port##_init, \ 101 .stop = NULL, \ 102 .setbrg = eserial##port##_setbrg, \ 103 .getc = eserial##port##_getc, \ 104 .tstc = eserial##port##_tstc, \ 105 .putc = eserial##port##_putc, \ 106 .puts = eserial##port##_puts, \ 107 } 108 109 static int calc_divisor (NS16550_t port) 110 { 111 #ifdef CONFIG_OMAP1510 112 /* If can't cleanly clock 115200 set div to 1 */ 113 if ((CONFIG_SYS_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) { 114 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */ 115 return (1); /* return 1 for base divisor */ 116 } 117 port->osc_12m_sel = 0; /* clear if previsouly set */ 118 #endif 119 #ifdef CONFIG_OMAP1610 120 /* If can't cleanly clock 115200 set div to 1 */ 121 if ((CONFIG_SYS_NS16550_CLK == 48000000) && (gd->baudrate == 115200)) { 122 return (26); /* return 26 for base divisor */ 123 } 124 #endif 125 126 #ifdef CONFIG_APTIX 127 #define MODE_X_DIV 13 128 #else 129 #define MODE_X_DIV 16 130 #endif 131 132 /* Compute divisor value. Normally, we should simply return: 133 * CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate 134 * but we need to round that value by adding 0.5. 135 * Rounding is especially important at high baud rates. 136 */ 137 return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) / 138 (MODE_X_DIV * gd->baudrate); 139 } 140 141 void 142 _serial_putc(const char c,const int port) 143 { 144 if (c == '\n') 145 NS16550_putc(PORT, '\r'); 146 147 NS16550_putc(PORT, c); 148 } 149 150 void 151 _serial_putc_raw(const char c,const int port) 152 { 153 NS16550_putc(PORT, c); 154 } 155 156 void 157 _serial_puts (const char *s,const int port) 158 { 159 while (*s) { 160 _serial_putc (*s++,port); 161 } 162 } 163 164 165 int 166 _serial_getc(const int port) 167 { 168 return NS16550_getc(PORT); 169 } 170 171 int 172 _serial_tstc(const int port) 173 { 174 return NS16550_tstc(PORT); 175 } 176 177 void 178 _serial_setbrg (const int port) 179 { 180 int clock_divisor; 181 182 clock_divisor = calc_divisor(PORT); 183 NS16550_reinit(PORT, clock_divisor); 184 } 185 186 static inline void 187 serial_putc_dev(unsigned int dev_index,const char c) 188 { 189 _serial_putc(c,dev_index); 190 } 191 192 static inline void 193 serial_putc_raw_dev(unsigned int dev_index,const char c) 194 { 195 _serial_putc_raw(c,dev_index); 196 } 197 198 static inline void 199 serial_puts_dev(unsigned int dev_index,const char *s) 200 { 201 _serial_puts(s,dev_index); 202 } 203 204 static inline int 205 serial_getc_dev(unsigned int dev_index) 206 { 207 return _serial_getc(dev_index); 208 } 209 210 static inline int 211 serial_tstc_dev(unsigned int dev_index) 212 { 213 return _serial_tstc(dev_index); 214 } 215 216 static inline void 217 serial_setbrg_dev(unsigned int dev_index) 218 { 219 _serial_setbrg(dev_index); 220 } 221 222 DECLARE_ESERIAL_FUNCTIONS(1); 223 struct serial_device eserial1_device = 224 INIT_ESERIAL_STRUCTURE(1, "eserial0"); 225 DECLARE_ESERIAL_FUNCTIONS(2); 226 struct serial_device eserial2_device = 227 INIT_ESERIAL_STRUCTURE(2, "eserial1"); 228 DECLARE_ESERIAL_FUNCTIONS(3); 229 struct serial_device eserial3_device = 230 INIT_ESERIAL_STRUCTURE(3, "eserial2"); 231 DECLARE_ESERIAL_FUNCTIONS(4); 232 struct serial_device eserial4_device = 233 INIT_ESERIAL_STRUCTURE(4, "eserial3"); 234 235 __weak struct serial_device *default_serial_console(void) 236 { 237 #if CONFIG_CONS_INDEX == 1 238 return &eserial1_device; 239 #elif CONFIG_CONS_INDEX == 2 240 return &eserial2_device; 241 #elif CONFIG_CONS_INDEX == 3 242 return &eserial3_device; 243 #elif CONFIG_CONS_INDEX == 4 244 return &eserial4_device; 245 #else 246 #error "Bad CONFIG_CONS_INDEX." 247 #endif 248 } 249 250 void ns16550_serial_initialize(void) 251 { 252 #if defined(CONFIG_SYS_NS16550_COM1) 253 serial_register(&eserial1_device); 254 #endif 255 #if defined(CONFIG_SYS_NS16550_COM2) 256 serial_register(&eserial2_device); 257 #endif 258 #if defined(CONFIG_SYS_NS16550_COM3) 259 serial_register(&eserial3_device); 260 #endif 261 #if defined(CONFIG_SYS_NS16550_COM4) 262 serial_register(&eserial4_device); 263 #endif 264 } 265