board/linkstation/avr.c

   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      */
  38 #define HDDLEDON                'W'             /* HDD LED on           */
  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 };
  60 #define MAX_CONS_CHOICE         (sizeof(consoles)/sizeof(char *))
  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) CONFIG_SYS_NS16550_COM2;
  83         int clock_divisor = CONFIG_SYS_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)CONFIG_SYS_NS16550_COM2));
 109 }
 110
 111 static inline char avr_getc(void)
 112 {
 113         return (NS16550_getc((NS16550_t)CONFIG_SYS_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 }