board/trab/trab.c

   1 /*
   2  * (C) Copyright 2002
   3  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
   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 /* #define DEBUG */
  25
  26 #include <common.h>
  27 #include <malloc.h>
  28 #include <s3c2400.h>
  29 #include <command.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 #ifdef CONFIG_SYS_BRIGHTNESS
  34 static void spi_init(void);
  35 static void wait_transmit_done(void);
  36 static void tsc2000_write(unsigned int page, unsigned int reg,
  37                                                   unsigned int data);
  38 static void tsc2000_set_brightness(void);
  39 #endif
  40 #ifdef CONFIG_MODEM_SUPPORT
  41 static int key_pressed(void);
  42 extern void disable_putc(void);
  43 extern int do_mdm_init; /* defined in common/main.c */
  44
  45 /*
  46  * We need a delay of at least 500 us after turning on the VFD clock
  47  * before we can read any useful information for the CPLD controlling
  48  * the keyboard switches. Let's play safe and wait 5 ms. The problem
  49  * is that timers are not available yet, so we use a manually timed
  50  * loop.
  51  */
  52 #define KBD_MDELAY      5000
  53 static void udelay_no_timer (int usec)
  54 {
  55         int i;
  56         int delay = usec * 3;
  57
  58         for (i = 0; i < delay; i ++) gd->bd->bi_arch_number = MACH_TYPE_TRAB;
  59 }
  60 #endif /* CONFIG_MODEM_SUPPORT */
  61
  62 /*
  63  * Miscellaneous platform dependent initialisations
  64  */
  65
  66 int board_init ()
  67 {
  68 #if defined(CONFIG_VFD)
  69         extern int vfd_init_clocks(void);
  70 #endif
  71         S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
  72         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
  73
  74         /* memory and cpu-speed are setup before relocation */
  75 #ifdef CONFIG_TRAB_50MHZ
  76         /* change the clock to be 50 MHz 1:1:1 */
  77         /* MDIV:0x5c PDIV:4 SDIV:2 */
  78         clk_power->MPLLCON = 0x5c042;
  79         clk_power->CLKDIVN = 0;
  80 #else
  81         /* change the clock to be 133 MHz 1:2:4 */
  82         /* MDIV:0x7d PDIV:4 SDIV:1 */
  83         clk_power->MPLLCON = 0x7d041;
  84         clk_power->CLKDIVN = 3;
  85 #endif
  86
  87         /* set up the I/O ports */
  88         gpio->PACON = 0x3ffff;
  89         gpio->PBCON = 0xaaaaaaaa;
  90         gpio->PBUP  = 0xffff;
  91         /* INPUT nCTS0 nRTS0 TXD[1] TXD[0] RXD[1] RXD[0]        */
  92         /*  00,    10,      10,      10,      10,      10,      10      */
  93         gpio->PFCON = (2<<0) | (2<<2) | (2<<4) | (2<<6) | (2<<8) | (2<<10);
  94 #ifdef CONFIG_HWFLOW
  95         /* do not pull up RXD0, RXD1, TXD0, TXD1, CTS0, RTS0 */
  96         gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3) | (1<<4) | (1<<5);
  97 #else
  98         /* do not pull up RXD0, RXD1, TXD0, TXD1 */
  99         gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3);
 100 #endif
 101         gpio->PGCON = 0x0;
 102         gpio->PGUP  = 0x0;
 103         gpio->OPENCR= 0x0;
 104
 105         /* suppress flicker of the VFDs */
 106         gpio->MISCCR = 0x40;
 107         gpio->PFCON |= (2<<12);
 108
 109         gd->bd->bi_arch_number = MACH_TYPE_TRAB;
 110
 111         /* adress of boot parameters */
 112         gd->bd->bi_boot_params = 0x0c000100;
 113
 114         /* Make sure both buzzers are turned off */
 115         gpio->PDCON |= 0x5400;
 116         gpio->PDDAT &= ~0xE0;
 117
 118 #ifdef CONFIG_VFD
 119         vfd_init_clocks();
 120 #endif /* CONFIG_VFD */
 121
 122 #ifdef CONFIG_MODEM_SUPPORT
 123         udelay_no_timer (KBD_MDELAY);
 124
 125         if (key_pressed()) {
 126                 disable_putc(); /* modem doesn't understand banner etc */
 127                 do_mdm_init = 1;
 128         }
 129 #endif  /* CONFIG_MODEM_SUPPORT */
 130
 131 #ifdef CONFIG_DRIVER_S3C24X0_I2C
 132         /* Configure I/O ports PG5 und PG6 for I2C */
 133         gpio->PGCON = (gpio->PGCON & 0x003c00) | 0x003c00;
 134 #endif /* CONFIG_DRIVER_S3C24X0_I2C */
 135
 136         return 0;
 137 }
 138
 139 int dram_init (void)
 140 {
 141         gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 142         gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
 143         return 0;
 144 }
 145
 146 /*-----------------------------------------------------------------------
 147  * Keyboard Controller
 148  */
 149
 150 /* Maximum key number */
 151 #define KEYBD_KEY_NUM           4
 152
 153 #define KBD_DATA        (((*(volatile ulong *)0x04020000) >> 16) & 0xF)
 154
 155 static char *key_match (ulong);
 156
 157 int misc_init_r (void)
 158 {
 159         ulong kbd_data = KBD_DATA;
 160         char *str;
 161         char keybd_env[KEYBD_KEY_NUM + 1];
 162         int i;
 163
 164 #ifdef CONFIG_VERSION_VARIABLE
 165         {
 166                 /* Set version variable. Please note, that this variable is
 167                  * also set in main_loop() later in the boot process. The
 168                  * version variable has to be set this early, because so it
 169                  * could be used in script files on an usb stick, which
 170                  * might be called during do_auto_update() */
 171                 extern char version_string[];
 172
 173                 setenv ("ver", version_string);
 174         }
 175 #endif /* CONFIG_VERSION_VARIABLE */
 176
 177 #ifdef CONFIG_AUTO_UPDATE
 178         {
 179                 extern int do_auto_update(void);
 180                 /* this has priority over all else */
 181                 do_auto_update();
 182         }
 183 #endif
 184
 185         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 186                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 187         }
 188         keybd_env[i] = '\0';
 189         debug ("** Setting keybd=\"%s\"\n", keybd_env);
 190         setenv ("keybd", keybd_env);
 191
 192         str = strdup (key_match (kbd_data));    /* decode keys */
 193
 194 #ifdef CONFIG_PREBOOT   /* automatically configure "preboot" command on key match */
 195         debug ("** Setting preboot=\"%s\"\n", str);
 196         setenv ("preboot", str);        /* set or delete definition */
 197 #endif /* CONFIG_PREBOOT */
 198         if (str != NULL) {
 199                 free (str);
 200         }
 201
 202 #ifdef CONFIG_SYS_BRIGHTNESS
 203         tsc2000_set_brightness();
 204 #endif
 205         return (0);
 206 }
 207
 208 #ifdef CONFIG_PREBOOT
 209
 210 static uchar kbd_magic_prefix[] = "key_magic";
 211 static uchar kbd_command_prefix[] = "key_cmd";
 212
 213 static int compare_magic (ulong kbd_data, char *str)
 214 {
 215         uchar key_mask;
 216
 217         debug ("compare_magic: kbd: %04lx  str: \"%s\"\n",kbd_data,str);
 218         for (; *str; str++)
 219         {
 220                 uchar c = *str - '1';
 221
 222                 if (c >= KEYBD_KEY_NUM)         /* bad key number */
 223                         return -1;
 224
 225                 key_mask = 1 << c;
 226
 227                 if (!(kbd_data & key_mask)) {   /* key not pressed */
 228                         debug ( "compare_magic: "
 229                                 "kbd: %04lx mask: %04lx - key not pressed\n",
 230                                 kbd_data, key_mask );
 231                         return -1;
 232                 }
 233
 234                 kbd_data &= ~key_mask;
 235         }
 236
 237         if (kbd_data) {                         /* key(s) not released */
 238                 debug ( "compare_magic: "
 239                         "kbd: %04lx - key(s) not released\n", kbd_data);
 240                 return -1;
 241         }
 242
 243         return 0;
 244 }
 245
 246 /*-----------------------------------------------------------------------
 247  * Check if pressed key(s) match magic sequence,
 248  * and return the command string associated with that key(s).
 249  *
 250  * If no key press was decoded, NULL is returned.
 251  *
 252  * Note: the first character of the argument will be overwritten with
 253  * the "magic charcter code" of the decoded key(s), or '\0'.
 254  *
 255  *
 256  * Note: the string points to static environment data and must be
 257  * saved before you call any function that modifies the environment.
 258  */
 259 static char *key_match (ulong kbd_data)
 260 {
 261         char magic[sizeof (kbd_magic_prefix) + 1];
 262         char cmd_name[sizeof (kbd_command_prefix) + 1];
 263         char *suffix;
 264         char *kbd_magic_keys;
 265
 266         /*
 267          * The following string defines the characters that can pe appended
 268          * to "key_magic" to form the names of environment variables that
 269          * hold "magic" key codes, i. e. such key codes that can cause
 270          * pre-boot actions. If the string is empty (""), then only
 271          * "key_magic" is checked (old behaviour); the string "125" causes
 272          * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 273          */
 274         if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 275                 kbd_magic_keys = "";
 276
 277         debug ("key_match: magic_keys=\"%s\"\n", kbd_magic_keys);
 278
 279         /* loop over all magic keys;
 280          * use '\0' suffix in case of empty string
 281          */
 282         for (suffix=kbd_magic_keys; *suffix || suffix==kbd_magic_keys; ++suffix)
 283         {
 284                 sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
 285
 286                 debug ("key_match: magic=\"%s\"\n",
 287                         getenv(magic) ? getenv(magic) : "<UNDEFINED>");
 288
 289                 if (compare_magic(kbd_data, getenv(magic)) == 0)
 290                 {
 291                         sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 292                         debug ("key_match: cmdname %s=\"%s\"\n",
 293                                 cmd_name,
 294                                 getenv (cmd_name) ?
 295                                         getenv (cmd_name) :
 296                                         "<UNDEFINED>");
 297                         return (getenv (cmd_name));
 298                 }
 299         }
 300         debug ("key_match: no match\n");
 301         return (NULL);
 302 }
 303 #endif                                                  /* CONFIG_PREBOOT */
 304
 305 /* Read Keyboard status */
 306 int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 307 {
 308         ulong kbd_data = KBD_DATA;
 309         char keybd_env[KEYBD_KEY_NUM + 1];
 310         int i;
 311
 312         puts ("Keys:");
 313         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 314                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 315                 printf (" %c", keybd_env[i]);
 316         }
 317         keybd_env[i] = '\0';
 318         putc ('\n');
 319         setenv ("keybd", keybd_env);
 320         return 0;
 321 }
 322
 323 U_BOOT_CMD(
 324         kbd,    1,      1,      do_kbd,
 325         "read keyboard status",
 326         NULL
 327 );
 328
 329 #ifdef CONFIG_MODEM_SUPPORT
 330 static int key_pressed(void)
 331 {
 332         return (compare_magic(KBD_DATA, CONFIG_MODEM_KEY_MAGIC) == 0);
 333 }
 334 #endif  /* CONFIG_MODEM_SUPPORT */
 335
 336 #ifdef CONFIG_SYS_BRIGHTNESS
 337
 338 static inline void SET_CS_TOUCH(void)
 339 {
 340         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 341
 342         gpio->PDDAT &= 0x5FF;
 343 }
 344
 345 static inline void CLR_CS_TOUCH(void)
 346 {
 347         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 348
 349         gpio->PDDAT |= 0x200;
 350 }
 351
 352 static void spi_init(void)
 353 {
 354         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 355         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 356         int i;
 357
 358         /* Configure I/O ports. */
 359         gpio->PDCON = (gpio->PDCON & 0xF3FFFF) | 0x040000;
 360         gpio->PGCON = (gpio->PGCON & 0x0F3FFF) | 0x008000;
 361         gpio->PGCON = (gpio->PGCON & 0x0CFFFF) | 0x020000;
 362         gpio->PGCON = (gpio->PGCON & 0x03FFFF) | 0x080000;
 363
 364         CLR_CS_TOUCH();
 365
 366         spi->ch[0].SPPRE = 0x1F; /* Baudrate ca. 514kHz */
 367         spi->ch[0].SPPIN = 0x01;  /* SPI-MOSI holds Level after last bit */
 368         spi->ch[0].SPCON = 0x1A;  /* Polling, Prescaler, Master, CPOL=0, CPHA=1 */
 369
 370         /* Dummy byte ensures clock to be low. */
 371         for (i = 0; i < 10; i++) {
 372                 spi->ch[0].SPTDAT = 0xFF;
 373         }
 374         wait_transmit_done();
 375 }
 376
 377 static void wait_transmit_done(void)
 378 {
 379         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 380
 381         while (!(spi->ch[0].SPSTA & 0x01)); /* wait until transfer is done */
 382 }
 383
 384 static void tsc2000_write(unsigned int page, unsigned int reg,
 385                                                   unsigned int data)
 386 {
 387         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 388         unsigned int command;
 389
 390         SET_CS_TOUCH();
 391         command = 0x0000;
 392         command |= (page << 11);
 393         command |= (reg << 5);
 394
 395         spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
 396         wait_transmit_done();
 397         spi->ch[0].SPTDAT = (command & 0x00FF);
 398         wait_transmit_done();
 399         spi->ch[0].SPTDAT = (data & 0xFF00) >> 8;
 400         wait_transmit_done();
 401         spi->ch[0].SPTDAT = (data & 0x00FF);
 402         wait_transmit_done();
 403
 404         CLR_CS_TOUCH();
 405 }
 406
 407 static void tsc2000_set_brightness(void)
 408 {
 409         char tmp[10];
 410         int i, br;
 411
 412         spi_init();
 413         tsc2000_write(1, 2, 0x0); /* Power up DAC */
 414
 415         i = getenv_r("brightness", tmp, sizeof(tmp));
 416         br = (i > 0)
 417                 ? (int) simple_strtoul (tmp, NULL, 10)
 418                 : CONFIG_SYS_BRIGHTNESS;
 419
 420         tsc2000_write(0, 0xb, br & 0xff);
 421 }
 422 #endif