Guennadi Liakhovetski | 40c26b2 | 2008-03-31 01:32:15 +0200 | [diff] [blame] | 1 | /* |
| 2 | * avr.c |
| 3 | * |
| 4 | * AVR functions |
| 5 | * |
| 6 | * Copyright (C) 2006 Mihai Georgian <u-boot@linuxnotincluded.org.uk> |
| 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 | #include <common.h> |
| 24 | #include <ns16550.h> |
| 25 | #include <console.h> |
| 26 | |
| 27 | /* Button codes from the AVR */ |
| 28 | #define PWRR 0x20 /* Power button release */ |
| 29 | #define PWRP 0x21 /* Power button push */ |
| 30 | #define RESR 0x22 /* Reset button release */ |
| 31 | #define RESP 0x23 /* Reset button push */ |
| 32 | #define AVRINIT 0x33 /* Init complete */ |
| 33 | #define AVRRESET 0x31 /* Reset request */ |
| 34 | |
| 35 | /* LED commands */ |
| 36 | #define PWRBLINKSTRT '[' /* Blink power LED */ |
| 37 | #define PWRBLINKSTOP 'Z' /* Solid power LED */ |
Wolfgang Denk | a1be476 | 2008-05-20 16:00:29 +0200 | [diff] [blame] | 38 | #define HDDLEDON 'W' /* HDD LED on */ |
Guennadi Liakhovetski | 40c26b2 | 2008-03-31 01:32:15 +0200 | [diff] [blame] | 39 | #define HDDLEDOFF 'V' /* HDD LED off */ |
| 40 | #define HDDBLINKSTRT 'Y' /* HDD LED start blink */ |
| 41 | #define HDDBLINKSTOP 'X' /* HDD LED stop blink */ |
| 42 | |
| 43 | /* Timings for LEDs blinking to show choice */ |
| 44 | #define PULSETIME 250 /* msecs */ |
| 45 | #define LONGPAUSE (5 * PULSETIME) |
| 46 | |
| 47 | /* Button press times */ |
| 48 | #define PUSHHOLD 1000 /* msecs */ |
| 49 | #define NOBUTTON (6 * (LONGPAUSE+PULSETIME)) |
| 50 | |
| 51 | /* Boot and console choices */ |
| 52 | #define MAX_BOOT_CHOICE 3 |
| 53 | |
| 54 | static char *consoles[] = { |
| 55 | "serial", |
| 56 | #if defined(CONFIG_NETCONSOLE) |
| 57 | "nc", |
| 58 | #endif |
| 59 | }; |
Wolfgang Denk | a1be476 | 2008-05-20 16:00:29 +0200 | [diff] [blame] | 60 | #define MAX_CONS_CHOICE (sizeof(consoles)/sizeof(char *)) |
Guennadi Liakhovetski | 40c26b2 | 2008-03-31 01:32:15 +0200 | [diff] [blame] | 61 | |
| 62 | #if !defined(CONFIG_NETCONSOLE) |
| 63 | #define DEF_CONS_CHOICE 0 |
| 64 | #else |
| 65 | #define DEF_CONS_CHOICE 1 |
| 66 | #endif |
| 67 | |
| 68 | #define perror(fmt, args...) printf("%s: " fmt, __FUNCTION__ , ##args) |
| 69 | |
| 70 | extern void miconCntl_SendCmd(unsigned char dat); |
| 71 | extern void miconCntl_DisWDT(void); |
| 72 | |
| 73 | static int boot_stop; |
| 74 | |
| 75 | static int boot_choice = 1; |
| 76 | static int cons_choice = DEF_CONS_CHOICE; |
| 77 | |
| 78 | static char envbuffer[16]; |
| 79 | |
| 80 | void init_AVR_DUART (void) |
| 81 | { |
| 82 | NS16550_t AVR_port = (NS16550_t) CFG_NS16550_COM2; |
| 83 | int clock_divisor = CFG_NS16550_CLK / 16 / 9600; |
| 84 | |
| 85 | /* |
| 86 | * AVR port init sequence taken from |
| 87 | * the original Linkstation init code |
| 88 | * Normal U-Boot serial reinit doesn't |
| 89 | * work because the AVR uses even parity |
| 90 | */ |
| 91 | AVR_port->lcr = 0x00; |
| 92 | AVR_port->ier = 0x00; |
| 93 | AVR_port->lcr = LCR_BKSE; |
| 94 | AVR_port->dll = clock_divisor & 0xff; |
| 95 | AVR_port->dlm = (clock_divisor >> 8) & 0xff; |
| 96 | AVR_port->lcr = LCR_WLS_8 | LCR_PEN | LCR_EPS; |
| 97 | AVR_port->mcr = 0x00; |
| 98 | AVR_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR; |
| 99 | |
| 100 | miconCntl_DisWDT(); |
| 101 | |
| 102 | boot_stop = 0; |
| 103 | miconCntl_SendCmd(PWRBLINKSTRT); |
| 104 | } |
| 105 | |
| 106 | static inline int avr_tstc(void) |
| 107 | { |
| 108 | return (NS16550_tstc((NS16550_t)CFG_NS16550_COM2)); |
| 109 | } |
| 110 | |
| 111 | static inline char avr_getc(void) |
| 112 | { |
| 113 | return (NS16550_getc((NS16550_t)CFG_NS16550_COM2)); |
| 114 | } |
| 115 | |
| 116 | static int push_timeout(char button_code) |
| 117 | { |
| 118 | ulong push_start = get_timer(0); |
| 119 | while (get_timer(push_start) <= PUSHHOLD) |
| 120 | if (avr_tstc() && avr_getc() == button_code) |
| 121 | return 0; |
| 122 | return 1; |
| 123 | } |
| 124 | |
| 125 | static void next_boot_choice(void) |
| 126 | { |
| 127 | ulong return_start; |
| 128 | ulong pulse_start; |
| 129 | int on_times; |
| 130 | int button_on; |
| 131 | int led_state; |
| 132 | char c; |
| 133 | |
| 134 | button_on = 0; |
| 135 | return_start = get_timer(0); |
| 136 | |
| 137 | on_times = boot_choice; |
| 138 | led_state = 0; |
| 139 | miconCntl_SendCmd(HDDLEDOFF); |
| 140 | pulse_start = get_timer(0); |
| 141 | |
| 142 | while (get_timer(return_start) <= NOBUTTON || button_on) { |
| 143 | if (avr_tstc()) { |
| 144 | c = avr_getc(); |
| 145 | if (c == PWRP) |
| 146 | button_on = 1; |
| 147 | else if (c == PWRR) { |
| 148 | button_on = 0; |
| 149 | return_start = get_timer(0); |
| 150 | if (++boot_choice > MAX_BOOT_CHOICE) |
| 151 | boot_choice = 1; |
| 152 | sprintf(envbuffer, "bootcmd%d", boot_choice); |
| 153 | if (getenv(envbuffer)) { |
| 154 | sprintf(envbuffer, "run bootcmd%d", boot_choice); |
| 155 | setenv("bootcmd", envbuffer); |
| 156 | } |
| 157 | on_times = boot_choice; |
| 158 | led_state = 1; |
| 159 | miconCntl_SendCmd(HDDLEDON); |
| 160 | pulse_start = get_timer(0); |
| 161 | } else { |
| 162 | perror("Unexpected code: 0x%02X\n", c); |
| 163 | } |
| 164 | } |
| 165 | if (on_times && get_timer(pulse_start) > PULSETIME) { |
| 166 | if (led_state == 1) { |
| 167 | --on_times; |
| 168 | led_state = 0; |
| 169 | miconCntl_SendCmd(HDDLEDOFF); |
| 170 | } else { |
| 171 | led_state = 1; |
| 172 | miconCntl_SendCmd(HDDLEDON); |
| 173 | } |
| 174 | pulse_start = get_timer(0); |
| 175 | } |
| 176 | if (!on_times && get_timer(pulse_start) > LONGPAUSE) { |
| 177 | on_times = boot_choice; |
| 178 | led_state = 1; |
| 179 | miconCntl_SendCmd(HDDLEDON); |
| 180 | pulse_start = get_timer(0); |
| 181 | } |
| 182 | } |
| 183 | if (led_state) |
| 184 | miconCntl_SendCmd(HDDLEDOFF); |
| 185 | } |
| 186 | |
| 187 | void next_cons_choice(int console) |
| 188 | { |
| 189 | ulong return_start; |
| 190 | ulong pulse_start; |
| 191 | int on_times; |
| 192 | int button_on; |
| 193 | int led_state; |
| 194 | char c; |
| 195 | |
| 196 | button_on = 0; |
| 197 | cons_choice = console; |
| 198 | return_start = get_timer(0); |
| 199 | |
| 200 | on_times = cons_choice+1; |
| 201 | led_state = 1; |
| 202 | miconCntl_SendCmd(HDDLEDON); |
| 203 | pulse_start = get_timer(0); |
| 204 | |
| 205 | while (get_timer(return_start) <= NOBUTTON || button_on) { |
| 206 | if (avr_tstc()) { |
| 207 | c = avr_getc(); |
| 208 | if (c == RESP) |
| 209 | button_on = 1; |
| 210 | else if (c == RESR) { |
| 211 | button_on = 0; |
| 212 | return_start = get_timer(0); |
| 213 | cons_choice = (cons_choice + 1) % MAX_CONS_CHOICE; |
| 214 | console_assign(stdin, consoles[cons_choice]); |
| 215 | console_assign(stdout, consoles[cons_choice]); |
| 216 | console_assign(stderr, consoles[cons_choice]); |
| 217 | on_times = cons_choice+1; |
| 218 | led_state = 0; |
| 219 | miconCntl_SendCmd(HDDLEDOFF); |
| 220 | pulse_start = get_timer(0); |
| 221 | } else { |
| 222 | perror("Unexpected code: 0x%02X\n", c); |
| 223 | } |
| 224 | } |
| 225 | if (on_times && get_timer(pulse_start) > PULSETIME) { |
| 226 | if (led_state == 0) { |
| 227 | --on_times; |
| 228 | led_state = 1; |
| 229 | miconCntl_SendCmd(HDDLEDON); |
| 230 | } else { |
| 231 | led_state = 0; |
| 232 | miconCntl_SendCmd(HDDLEDOFF); |
| 233 | } |
| 234 | pulse_start = get_timer(0); |
| 235 | } |
| 236 | if (!on_times && get_timer(pulse_start) > LONGPAUSE) { |
| 237 | on_times = cons_choice+1; |
| 238 | led_state = 0; |
| 239 | miconCntl_SendCmd(HDDLEDOFF); |
| 240 | pulse_start = get_timer(0); |
| 241 | } |
| 242 | } |
| 243 | if (led_state); |
| 244 | miconCntl_SendCmd(HDDLEDOFF); |
| 245 | } |
| 246 | |
| 247 | int avr_input(void) |
| 248 | { |
| 249 | char avr_button; |
| 250 | |
| 251 | if (!avr_tstc()) |
| 252 | return 0; |
| 253 | |
| 254 | avr_button = avr_getc(); |
| 255 | switch (avr_button) { |
| 256 | case PWRP: |
| 257 | if (push_timeout(PWRR)) { |
| 258 | /* Timeout before power button release */ |
| 259 | boot_stop = ~boot_stop; |
| 260 | if (boot_stop) |
| 261 | miconCntl_SendCmd(PWRBLINKSTOP); |
| 262 | else |
| 263 | miconCntl_SendCmd(PWRBLINKSTRT); |
| 264 | /* Wait for power button release */ |
| 265 | while (avr_getc() != PWRR) |
| 266 | ; |
| 267 | } else |
| 268 | /* Power button released */ |
| 269 | next_boot_choice(); |
| 270 | break; |
| 271 | case RESP: |
| 272 | /* Wait for Reset button release */ |
| 273 | while (avr_getc() != RESR) |
| 274 | ; |
| 275 | next_cons_choice(cons_choice); |
| 276 | break; |
| 277 | case AVRINIT: |
| 278 | return 0; |
| 279 | default: |
| 280 | perror("Unexpected code: 0x%02X\n", avr_button); |
| 281 | return 0; |
| 282 | } |
| 283 | if (boot_stop) |
| 284 | return (-3); |
| 285 | else |
| 286 | return (-2); |
| 287 | } |
| 288 | |
| 289 | void avr_StopBoot(void) |
| 290 | { |
| 291 | boot_stop = ~0; |
| 292 | miconCntl_SendCmd(PWRBLINKSTOP); |
| 293 | } |