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 <cmd_bsp.h>
  28 #include <malloc.h>
  29 #include <s3c2400.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
  75         /* memory and cpu-speed are setup before relocation */
  76 #ifdef CONFIG_TRAB_50MHZ
  77         /* change the clock to be 50 MHz 1:1:1 */
  78         /* MDIV:0x5c PDIV:4 SDIV:2 */
  79         rMPLLCON = 0x5c042;
  80         rCLKDIVN = 0;
  81 #else
  82         /* change the clock to be 133 MHz 1:2:4 */
  83         /* MDIV:0x7d PDIV:4 SDIV:1 */
  84         rMPLLCON = 0x7d041;
  85         rCLKDIVN = 3;
  86 #endif
  87
  88         /* set up the I/O ports */
  89         rPACON = 0x3ffff;
  90         rPBCON = 0xaaaaaaaa;
  91         rPBUP  = 0xffff;
  92         /* INPUT nCTS0 nRTS0 TXD[1] TXD[0] RXD[1] RXD[0]        */
  93         /*  00,    10,      10,      10,      10,      10,      10      */
  94         rPFCON = (2<<0) | (2<<2) | (2<<4) | (2<<6) | (2<<8) | (2<<10);
  95 #ifdef CONFIG_HWFLOW
  96         /* do not pull up RXD0, RXD1, TXD0, TXD1, CTS0, RTS0 */
  97         rPFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3) | (1<<4) | (1<<5);
  98 #else
  99         /* do not pull up RXD0, RXD1, TXD0, TXD1 */
 100         rPFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3);
 101 #endif
 102         rPGCON = 0x0;
 103         rPGUP  = 0x0;
 104         rOPENCR= 0x0;
 105
 106         /* arch number of SAMSUNG-Board */
 107         /* MACH_TYPE_SMDK2400 */
 108         /* XXX this isn't really correct, but keep it for now */
 109         gd->bd->bi_arch_number = 145;
 110
 111         /* adress of boot parameters */
 112         gd->bd->bi_boot_params = 0x0c000100;
 113
 114         /* Make sure both buzzers are turned off */
 115         rPDCON |= 0x5400;
 116         rPDDAT &= ~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         return 0;
 132 }
 133
 134 int dram_init (void)
 135 {
 136         DECLARE_GLOBAL_DATA_PTR;
 137
 138         gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 139         gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
 140         return 0;
 141 }
 142
 143 /*-----------------------------------------------------------------------
 144  * Keyboard Controller
 145  */
 146
 147 /* Maximum key number */
 148 #define KEYBD_KEY_NUM           4
 149
 150 #define KBD_DATA        (((*(volatile ulong *)0x04020000) >> 16) & 0xF)
 151
 152 static uchar *key_match (ulong);
 153
 154 int misc_init_r (void)
 155 {
 156         ulong kbd_data = KBD_DATA;
 157         uchar keybd_env[KEYBD_KEY_NUM + 1];
 158         uchar *str;
 159         int i;
 160
 161         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 162                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 163         }
 164         keybd_env[i] = '\0';
 165         debug ("** Setting keybd=\"%s\"\n", keybd_env);
 166         setenv ("keybd", keybd_env);
 167
 168         str = strdup (key_match (kbd_data));    /* decode keys */
 169
 170 #ifdef CONFIG_PREBOOT   /* automatically configure "preboot" command on key match */
 171         debug ("** Setting preboot=\"%s\"\n", str);
 172         setenv ("preboot", str);        /* set or delete definition */
 173 #endif /* CONFIG_PREBOOT */
 174         if (str != NULL) {
 175                 free (str);
 176         }
 177
 178 #ifdef CFG_BRIGHTNESS
 179         tsc2000_set_brightness();
 180 #endif
 181         return (0);
 182 }
 183
 184 #ifdef CONFIG_PREBOOT
 185
 186 static uchar kbd_magic_prefix[] = "key_magic";
 187 static uchar kbd_command_prefix[] = "key_cmd";
 188
 189 static int compare_magic (ulong kbd_data, uchar *str)
 190 {
 191         uchar key_mask;
 192
 193         debug ("compare_magic: kbd: %04lx  str: \"%s\"\n",kbd_data,str);
 194         for (; *str; str++)
 195         {
 196                 uchar c = *str - '1';
 197
 198                 if (c >= KEYBD_KEY_NUM)         /* bad key number */
 199                         return -1;
 200
 201                 key_mask = 1 << c;
 202
 203                 if (!(kbd_data & key_mask)) {   /* key not pressed */
 204                         debug ( "compare_magic: "
 205                                 "kbd: %04lx mask: %04lx - key not pressed\n",
 206                                 kbd_data, key_mask );
 207                         return -1;
 208                 }
 209
 210                 kbd_data &= ~key_mask;
 211         }
 212
 213         if (kbd_data) {                         /* key(s) not released */
 214                 debug ( "compare_magic: "
 215                         "kbd: %04lx - key(s) not released\n", kbd_data);
 216                 return -1;
 217         }
 218
 219         return 0;
 220 }
 221
 222 /*-----------------------------------------------------------------------
 223  * Check if pressed key(s) match magic sequence,
 224  * and return the command string associated with that key(s).
 225  *
 226  * If no key press was decoded, NULL is returned.
 227  *
 228  * Note: the first character of the argument will be overwritten with
 229  * the "magic charcter code" of the decoded key(s), or '\0'.
 230  *
 231  *
 232  * Note: the string points to static environment data and must be
 233  * saved before you call any function that modifies the environment.
 234  */
 235 static uchar *key_match (ulong kbd_data)
 236 {
 237         uchar magic[sizeof (kbd_magic_prefix) + 1];
 238         uchar cmd_name[sizeof (kbd_command_prefix) + 1];
 239         uchar *suffix;
 240         uchar *kbd_magic_keys;
 241
 242         /*
 243          * The following string defines the characters that can pe appended
 244          * to "key_magic" to form the names of environment variables that
 245          * hold "magic" key codes, i. e. such key codes that can cause
 246          * pre-boot actions. If the string is empty (""), then only
 247          * "key_magic" is checked (old behaviour); the string "125" causes
 248          * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 249          */
 250         if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 251                 kbd_magic_keys = "";
 252
 253         debug ("key_match: magic_keys=\"%s\"\n", kbd_magic_keys);
 254
 255         /* loop over all magic keys;
 256          * use '\0' suffix in case of empty string
 257          */
 258         for (suffix=kbd_magic_keys; *suffix || suffix==kbd_magic_keys; ++suffix)
 259         {
 260                 sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
 261
 262                 debug ("key_match: magic=\"%s\"\n",
 263                         getenv(magic) ? getenv(magic) : "<UNDEFINED>");
 264
 265                 if (compare_magic(kbd_data, getenv(magic)) == 0)
 266                 {
 267                         sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 268                         debug ("key_match: cmdname %s=\"%s\"\n",
 269                                 cmd_name,
 270                                 getenv (cmd_name) ?
 271                                         getenv (cmd_name) :
 272                                         "<UNDEFINED>");
 273                         return (getenv (cmd_name));
 274                 }
 275         }
 276         debug ("key_match: no match\n");
 277         return (NULL);
 278 }
 279 #endif                                                  /* CONFIG_PREBOOT */
 280
 281 /* Read Keyboard status */
 282 int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 283 {
 284         ulong kbd_data = KBD_DATA;
 285         uchar keybd_env[KEYBD_KEY_NUM + 1];
 286         int i;
 287
 288         puts ("Keys:");
 289         for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 290                 keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 291                 printf (" %c", keybd_env[i]);
 292         }
 293         keybd_env[i] = '\0';
 294         putc ('\n');
 295         setenv ("keybd", keybd_env);
 296         return 0;
 297 }
 298
 299 #ifdef CONFIG_MODEM_SUPPORT
 300 static int key_pressed(void)
 301 {
 302         return (compare_magic(KBD_DATA, CONFIG_MODEM_KEY_MAGIC) == 0);
 303 }
 304 #endif  /* CONFIG_MODEM_SUPPORT */
 305
 306 #ifdef CFG_BRIGHTNESS
 307
 308 #define SET_CS_TOUCH        (rPDDAT &= 0x5FF)
 309 #define CLR_CS_TOUCH        (rPDDAT |= 0x200)
 310
 311 static void spi_init(void)
 312 {
 313         int i;
 314
 315         /* Configure I/O ports. */
 316         rPDCON = (rPDCON & 0xF3FFFF) | 0x040000;
 317         rPGCON = (rPGCON & 0x0F3FFF) | 0x008000;
 318         rPGCON = (rPGCON & 0x0CFFFF) | 0x020000;
 319         rPGCON = (rPGCON & 0x03FFFF) | 0x080000;
 320
 321         CLR_CS_TOUCH;
 322
 323         rSPPRE = 0x1F; /* Baudrate ca. 514kHz */
 324         rSPPIN = 0x01;  /* SPI-MOSI holds Level after last bit */
 325         rSPCON = 0x1A;  /* Polling, Prescaler, Master, CPOL=0, CPHA=1 */
 326
 327         /* Dummy byte ensures clock to be low. */
 328         for (i = 0; i < 10; i++) {
 329                 rSPTDAT = 0xFF;
 330         }
 331 }
 332
 333 static void wait_transmit_done(void)
 334 {
 335         while (!(rSPSTA & 0x01)); /* wait until transfer is done */
 336 }
 337
 338 static void tsc2000_write(unsigned int page, unsigned int reg,
 339                                                   unsigned int data)
 340 {
 341         unsigned int command;
 342
 343         SET_CS_TOUCH;
 344         command = 0x0000;
 345         command |= (page << 11);
 346         command |= (reg << 5);
 347
 348         rSPTDAT = (command & 0xFF00) >> 8;
 349         wait_transmit_done();
 350         rSPTDAT = (command & 0x00FF);
 351         wait_transmit_done();
 352         rSPTDAT = (data & 0xFF00) >> 8;
 353         wait_transmit_done();
 354         rSPTDAT = (data & 0x00FF);
 355         wait_transmit_done();
 356
 357         CLR_CS_TOUCH;
 358 }
 359
 360 static void tsc2000_set_brightness(void)
 361 {
 362         uchar tmp[10];
 363         int i, br;
 364
 365         spi_init();
 366         tsc2000_write(1, 2, 0x0); /* Power up DAC */
 367
 368         i = getenv_r("brightness", tmp, sizeof(tmp));
 369         br = (i > 0)
 370                 ? (int) simple_strtoul (tmp, NULL, 10)
 371                 : CFG_BRIGHTNESS;
 372
 373         tsc2000_write(0, 0xb, br & 0xff);
 374 }
 375 #endif