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 /* ------------------------------------------------------------------------- */
  32
  33 #ifdef CFG_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         DECLARE_GLOBAL_DATA_PTR;
  56
  57         int i;
  58         int delay = usec * 3;
  59
  60         for (i = 0; i < delay; i ++) gd->bd->bi_arch_number = 145;
  61 }
  62 #endif /* CONFIG_MODEM_SUPPORT */
  63
  64 /*
  65  * Miscellaneous platform dependent initialisations
  66  */
  67
  68 int board_init ()
  69 {
  70 #if defined(CONFIG_VFD)
  71         extern int vfd_init_clocks(void);
  72 #endif
  73         DECLARE_GLOBAL_DATA_PTR;
  74         S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
  75         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
  76
  77         /* memory and cpu-speed are setup before relocation */
  78 #ifdef CONFIG_TRAB_50MHZ
  79         /* change the clock to be 50 MHz 1:1:1 */
  80         /* MDIV:0x5c PDIV:4 SDIV:2 */
  81         clk_power->MPLLCON = 0x5c042;
  82         clk_power->CLKDIVN = 0;
  83 #else
  84         /* change the clock to be 133 MHz 1:2:4 */
  85         /* MDIV:0x7d PDIV:4 SDIV:1 */
  86         clk_power->MPLLCON = 0x7d041;
  87         clk_power->CLKDIVN = 3;
  88 #endif
  89
  90         /* set up the I/O ports */
  91         gpio->PACON = 0x3ffff;
  92         gpio->PBCON = 0xaaaaaaaa;
  93         gpio->PBUP  = 0xffff;
  94         /* INPUT nCTS0 nRTS0 TXD[1] TXD[0] RXD[1] RXD[0]        */
  95         /*  00,    10,      10,      10,      10,      10,      10      */
  96         gpio->PFCON = (2<<0) | (2<<2) | (2<<4) | (2<<6) | (2<<8) | (2<<10);
  97 #ifdef CONFIG_HWFLOW
  98         /* do not pull up RXD0, RXD1, TXD0, TXD1, CTS0, RTS0 */
  99         gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3) | (1<<4) | (1<<5);
 100 #else
 101         /* do not pull up RXD0, RXD1, TXD0, TXD1 */
 102         gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3);
 103 #endif
 104         gpio->PGCON = 0x0;
 105         gpio->PGUP  = 0x0;
 106         gpio->OPENCR= 0x0;
 107
 108         /* arch number of SAMSUNG-Board */
 109         /* MACH_TYPE_SMDK2400 */
 110         /* XXX this isn't really correct, but keep it for now */
 111         gd->bd->bi_arch_number = 145;
 112
 113         /* adress of boot parameters */
 114         gd->bd->bi_boot_params = 0x0c000100;
 115
 116         /* Make sure both buzzers are turned off */
 117         gpio->PDCON |= 0x5400;
 118         gpio->PDDAT &= ~0xE0;
 119
 120 #ifdef CONFIG_VFD
 121         vfd_init_clocks();
 122 #endif /* CONFIG_VFD */
 123
 124 #ifdef CONFIG_MODEM_SUPPORT
 125         udelay_no_timer (KBD_MDELAY);
 126
 127         if (key_pressed()) {
 128                 disable_putc(); /* modem doesn't understand banner etc */
 129                 do_mdm_init = 1;
 130         }
 131 #endif  /* CONFIG_MODEM_SUPPORT */
 132
 133         return 0;
 134 }
 135
 136 int dram_init (void)
 137 {
 138         DECLARE_GLOBAL_DATA_PTR;
 139
 140         gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 141         gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
 142         return 0;
 143 }
 144
 145 /*-----------------------------------------------------------------------
 146  * Keyboard Controller
 147  */
 148
 149 /* Maximum key number */
 150 #define KEYBD_KEY_NUM           4
 151
 152 #define KBD_DATA        (((*(volatile ulong *)0x04020000) >> 16) & 0xF)
 153
 154 static uchar *key_match (ulong);
 155
 156 int misc_init_r (void)
 157 {
 158         ulong kbd_data = KBD_DATA;
 159         uchar keybd_env[KEYBD_KEY_NUM + 1];
 160         uchar *str;
 161         int i;
 162
 163         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 164                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 165         }
 166         keybd_env[i] = '\0';
 167         debug ("** Setting keybd=\"%s\"\n", keybd_env);
 168         setenv ("keybd", keybd_env);
 169
 170         str = strdup (key_match (kbd_data));    /* decode keys */
 171
 172 #ifdef CONFIG_PREBOOT   /* automatically configure "preboot" command on key match */
 173         debug ("** Setting preboot=\"%s\"\n", str);
 174         setenv ("preboot", str);        /* set or delete definition */
 175 #endif /* CONFIG_PREBOOT */
 176         if (str != NULL) {
 177                 free (str);
 178         }
 179
 180 #ifdef CFG_BRIGHTNESS
 181         tsc2000_set_brightness();
 182 #endif
 183         return (0);
 184 }
 185
 186 #ifdef CONFIG_PREBOOT
 187
 188 static uchar kbd_magic_prefix[] = "key_magic";
 189 static uchar kbd_command_prefix[] = "key_cmd";
 190
 191 static int compare_magic (ulong kbd_data, uchar *str)
 192 {
 193         uchar key_mask;
 194
 195         debug ("compare_magic: kbd: %04lx  str: \"%s\"\n",kbd_data,str);
 196         for (; *str; str++)
 197         {
 198                 uchar c = *str - '1';
 199
 200                 if (c >= KEYBD_KEY_NUM)         /* bad key number */
 201                         return -1;
 202
 203                 key_mask = 1 << c;
 204
 205                 if (!(kbd_data & key_mask)) {   /* key not pressed */
 206                         debug ( "compare_magic: "
 207                                 "kbd: %04lx mask: %04lx - key not pressed\n",
 208                                 kbd_data, key_mask );
 209                         return -1;
 210                 }
 211
 212                 kbd_data &= ~key_mask;
 213         }
 214
 215         if (kbd_data) {                         /* key(s) not released */
 216                 debug ( "compare_magic: "
 217                         "kbd: %04lx - key(s) not released\n", kbd_data);
 218                 return -1;
 219         }
 220
 221         return 0;
 222 }
 223
 224 /*-----------------------------------------------------------------------
 225  * Check if pressed key(s) match magic sequence,
 226  * and return the command string associated with that key(s).
 227  *
 228  * If no key press was decoded, NULL is returned.
 229  *
 230  * Note: the first character of the argument will be overwritten with
 231  * the "magic charcter code" of the decoded key(s), or '\0'.
 232  *
 233  *
 234  * Note: the string points to static environment data and must be
 235  * saved before you call any function that modifies the environment.
 236  */
 237 static uchar *key_match (ulong kbd_data)
 238 {
 239         uchar magic[sizeof (kbd_magic_prefix) + 1];
 240         uchar cmd_name[sizeof (kbd_command_prefix) + 1];
 241         uchar *suffix;
 242         uchar *kbd_magic_keys;
 243
 244         /*
 245          * The following string defines the characters that can pe appended
 246          * to "key_magic" to form the names of environment variables that
 247          * hold "magic" key codes, i. e. such key codes that can cause
 248          * pre-boot actions. If the string is empty (""), then only
 249          * "key_magic" is checked (old behaviour); the string "125" causes
 250          * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 251          */
 252         if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 253                 kbd_magic_keys = "";
 254
 255         debug ("key_match: magic_keys=\"%s\"\n", kbd_magic_keys);
 256
 257         /* loop over all magic keys;
 258          * use '\0' suffix in case of empty string
 259          */
 260         for (suffix=kbd_magic_keys; *suffix || suffix==kbd_magic_keys; ++suffix)
 261         {
 262                 sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
 263
 264                 debug ("key_match: magic=\"%s\"\n",
 265                         getenv(magic) ? getenv(magic) : "<UNDEFINED>");
 266
 267                 if (compare_magic(kbd_data, getenv(magic)) == 0)
 268                 {
 269                         sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 270                         debug ("key_match: cmdname %s=\"%s\"\n",
 271                                 cmd_name,
 272                                 getenv (cmd_name) ?
 273                                         getenv (cmd_name) :
 274                                         "<UNDEFINED>");
 275                         return (getenv (cmd_name));
 276                 }
 277         }
 278         debug ("key_match: no match\n");
 279         return (NULL);
 280 }
 281 #endif                                                  /* CONFIG_PREBOOT */
 282
 283 /* Read Keyboard status */
 284 int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 285 {
 286         ulong kbd_data = KBD_DATA;
 287         uchar keybd_env[KEYBD_KEY_NUM + 1];
 288         int i;
 289
 290         puts ("Keys:");
 291         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 292                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 293                 printf (" %c", keybd_env[i]);
 294         }
 295         keybd_env[i] = '\0';
 296         putc ('\n');
 297         setenv ("keybd", keybd_env);
 298         return 0;
 299 }
 300
 301 U_BOOT_CMD(
 302         kbd,    1,      1,      do_kbd,
 303         "kbd     - read keyboard status\n",
 304         NULL
 305 );
 306
 307 #ifdef CONFIG_MODEM_SUPPORT
 308 static int key_pressed(void)
 309 {
 310         return (compare_magic(KBD_DATA, CONFIG_MODEM_KEY_MAGIC) == 0);
 311 }
 312 #endif  /* CONFIG_MODEM_SUPPORT */
 313
 314 #ifdef CFG_BRIGHTNESS
 315
 316 static inline void SET_CS_TOUCH(void)
 317 {
 318         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 319
 320         gpio->PDDAT &= 0x5FF;
 321 }
 322
 323 static inline void CLR_CS_TOUCH(void)
 324 {
 325         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 326
 327         gpio->PDDAT |= 0x200;
 328 }
 329
 330 static void spi_init(void)
 331 {
 332         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 333         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 334         int i;
 335
 336         /* Configure I/O ports. */
 337         gpio->PDCON = (gpio->PDCON & 0xF3FFFF) | 0x040000;
 338         gpio->PGCON = (gpio->PGCON & 0x0F3FFF) | 0x008000;
 339         gpio->PGCON = (gpio->PGCON & 0x0CFFFF) | 0x020000;
 340         gpio->PGCON = (gpio->PGCON & 0x03FFFF) | 0x080000;
 341
 342         CLR_CS_TOUCH();
 343
 344         spi->ch[0].SPPRE = 0x1F; /* Baudrate ca. 514kHz */
 345         spi->ch[0].SPPIN = 0x01;  /* SPI-MOSI holds Level after last bit */
 346         spi->ch[0].SPCON = 0x1A;  /* Polling, Prescaler, Master, CPOL=0, CPHA=1 */
 347
 348         /* Dummy byte ensures clock to be low. */
 349         for (i = 0; i < 10; i++) {
 350                 spi->ch[0].SPTDAT = 0xFF;
 351         }
 352         wait_transmit_done();
 353 }
 354
 355 static void wait_transmit_done(void)
 356 {
 357         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 358
 359         while (!(spi->ch[0].SPSTA & 0x01)); /* wait until transfer is done */
 360 }
 361
 362 static void tsc2000_write(unsigned int page, unsigned int reg,
 363                                                   unsigned int data)
 364 {
 365         S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 366         unsigned int command;
 367
 368         SET_CS_TOUCH();
 369         command = 0x0000;
 370         command |= (page << 11);
 371         command |= (reg << 5);
 372
 373         spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
 374         wait_transmit_done();
 375         spi->ch[0].SPTDAT = (command & 0x00FF);
 376         wait_transmit_done();
 377         spi->ch[0].SPTDAT = (data & 0xFF00) >> 8;
 378         wait_transmit_done();
 379         spi->ch[0].SPTDAT = (data & 0x00FF);
 380         wait_transmit_done();
 381
 382         CLR_CS_TOUCH();
 383 }
 384
 385 static void tsc2000_set_brightness(void)
 386 {
 387         uchar tmp[10];
 388         int i, br;
 389
 390         spi_init();
 391         tsc2000_write(1, 2, 0x0); /* Power up DAC */
 392
 393         i = getenv_r("brightness", tmp, sizeof(tmp));
 394         br = (i > 0)
 395                 ? (int) simple_strtoul (tmp, NULL, 10)
 396                 : CFG_BRIGHTNESS;
 397
 398         tsc2000_write(0, 0xb, br & 0xff);
 399 }
 400 #endif