board/keymile/common/common.c

   1 /*
   2  * (C) Copyright 2008
   3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   4  *
   5  * (C) Copyright 2011
   6  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <ioports.h>
  29 #include <command.h>
  30 #include <malloc.h>
  31 #include <hush.h>
  32 #include <net.h>
  33 #include <netdev.h>
  34 #include <asm/io.h>
  35 #include <linux/ctype.h>
  36
  37 #include "common.h"
  38 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
  39 #include <i2c.h>
  40 #endif
  41
  42 static void i2c_write_start_seq(void);
  43 DECLARE_GLOBAL_DATA_PTR;
  44
  45 /*
  46  * Set Keymile specific environment variables
  47  * Currently only some memory layout variables are calculated here
  48  * ... ------------------------------------------------
  49  * ... |@rootfsaddr |@pnvramaddr |@varaddr |@reserved |@END_OF_RAM
  50  * ... |<------------------- pram ------------------->|
  51  * ... ------------------------------------------------
  52  * @END_OF_RAM: denotes the RAM size
  53  * @pnvramaddr: Startadress of pseudo non volatile RAM in hex
  54  * @pram      : preserved ram size in k
  55  * @varaddr   : startadress for /var mounted into RAM
  56  */
  57 int set_km_env(void)
  58 {
  59         uchar buf[32];
  60         unsigned int pnvramaddr;
  61         unsigned int pram;
  62         unsigned int varaddr;
  63         unsigned int kernelmem;
  64         char *p;
  65         unsigned long rootfssize = 0;
  66
  67         pnvramaddr = gd->ram_size - CONFIG_KM_RESERVED_PRAM - CONFIG_KM_PHRAM
  68                         - CONFIG_KM_PNVRAM;
  69         sprintf((char *)buf, "0x%x", pnvramaddr);
  70         setenv("pnvramaddr", (char *)buf);
  71
  72         /* try to read rootfssize (ram image) from envrionment */
  73         p = getenv("rootfssize");
  74         if (p != NULL)
  75                 strict_strtoul(p, 16, &rootfssize);
  76         pram = (rootfssize + CONFIG_KM_RESERVED_PRAM + CONFIG_KM_PHRAM +
  77                 CONFIG_KM_PNVRAM) / 0x400;
  78         sprintf((char *)buf, "0x%x", pram);
  79         setenv("pram", (char *)buf);
  80
  81         varaddr = gd->ram_size - CONFIG_KM_RESERVED_PRAM - CONFIG_KM_PHRAM;
  82         sprintf((char *)buf, "0x%x", varaddr);
  83         setenv("varaddr", (char *)buf);
  84
  85         kernelmem = gd->ram_size - 0x400 * pram;
  86         sprintf((char *)buf, "0x%x", kernelmem);
  87         setenv("kernelmem", (char *)buf);
  88
  89         return 0;
  90 }
  91
  92 #define DELAY_ABORT_SEQ         62  /* @200kHz 9 clocks = 44us, 62us is ok */
  93 #define DELAY_HALF_PERIOD       (500 / (CONFIG_SYS_I2C_SPEED / 1000))
  94
  95 #if !defined(CONFIG_MPC83xx)
  96 static void i2c_write_start_seq(void)
  97 {
  98         set_sda(1);
  99         udelay(DELAY_HALF_PERIOD);
 100         set_scl(1);
 101         udelay(DELAY_HALF_PERIOD);
 102         set_sda(0);
 103         udelay(DELAY_HALF_PERIOD);
 104         set_scl(0);
 105         udelay(DELAY_HALF_PERIOD);
 106 }
 107
 108 /*
 109  * I2C is a synchronous protocol and resets of the processor in the middle
 110  * of an access can block the I2C Bus until a powerdown of the full unit is
 111  * done. This function toggles the SCL until the SCL and SCA line are
 112  * released, but max. 16 times, after this a I2C start-sequence is sent.
 113  * This I2C Deblocking mechanism was developed by Keymile in association
 114  * with Anatech and Atmel in 1998.
 115  */
 116 int i2c_make_abort(void)
 117 {
 118
 119 #if defined(CONFIG_HARD_I2C) && !defined(MACH_TYPE_KM_KIRKWOOD)
 120         immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ;
 121         i2c8260_t *i2c  = (i2c8260_t *)&immap->im_i2c;
 122
 123         /*
 124          * disable I2C controller first, otherwhise it thinks we want to
 125          * talk to the slave port...
 126          */
 127         clrbits_8(&i2c->i2c_i2mod, 0x01);
 128
 129         /* Set the PortPins to GPIO */
 130         setports(1);
 131 #endif
 132
 133         int     scl_state = 0;
 134         int     sda_state = 0;
 135         int     i = 0;
 136         int     ret = 0;
 137
 138         if (!get_sda()) {
 139                 ret = -1;
 140                 while (i < 16) {
 141                         i++;
 142                         set_scl(0);
 143                         udelay(DELAY_ABORT_SEQ);
 144                         set_scl(1);
 145                         udelay(DELAY_ABORT_SEQ);
 146                         scl_state = get_scl();
 147                         sda_state = get_sda();
 148                         if (scl_state && sda_state) {
 149                                 ret = 0;
 150                                 printf("[INFO] i2c abort after %d clocks\n", i);
 151                                 break;
 152                         }
 153                 }
 154         }
 155         if (ret == 0)
 156                 for (i = 0; i < 5; i++)
 157                         i2c_write_start_seq();
 158         else
 159                 printf("[ERROR] i2c abort failed\n");
 160
 161         /* respect stop setup time */
 162         udelay(DELAY_ABORT_SEQ);
 163         set_scl(1);
 164         udelay(DELAY_ABORT_SEQ);
 165         set_sda(1);
 166         get_sda();
 167
 168 #if defined(CONFIG_HARD_I2C)
 169         /* Set the PortPins back to use for I2C */
 170         setports(0);
 171 #endif
 172         return ret;
 173 }
 174 #endif /* !MPC83xx */
 175
 176 #if defined(CONFIG_MPC83xx)
 177 static void i2c_write_start_seq(void)
 178 {
 179         struct fsl_i2c *dev;
 180         dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
 181         udelay(DELAY_ABORT_SEQ);
 182         out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
 183         udelay(DELAY_ABORT_SEQ);
 184         out_8(&dev->cr, (I2C_CR_MEN));
 185 }
 186
 187 int i2c_make_abort(void)
 188 {
 189         struct fsl_i2c *dev;
 190         dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
 191         uchar   dummy;
 192         uchar   last;
 193         int     nbr_read = 0;
 194         int     i = 0;
 195         int         ret = 0;
 196
 197         /* wait after each operation to finsh with a delay */
 198         out_8(&dev->cr, (I2C_CR_MSTA));
 199         udelay(DELAY_ABORT_SEQ);
 200         out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
 201         udelay(DELAY_ABORT_SEQ);
 202         dummy = in_8(&dev->dr);
 203         udelay(DELAY_ABORT_SEQ);
 204         last = in_8(&dev->dr);
 205         nbr_read++;
 206
 207         /*
 208          * do read until the last bit is 1, but stop if the full eeprom is
 209          * read.
 210          */
 211         while (((last & 0x01) != 0x01) &&
 212                 (nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
 213                 udelay(DELAY_ABORT_SEQ);
 214                 last = in_8(&dev->dr);
 215                 nbr_read++;
 216         }
 217         if ((last & 0x01) != 0x01)
 218                 ret = -2;
 219         if ((last != 0xff) || (nbr_read > 1))
 220                 printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
 221                         nbr_read, last);
 222         udelay(DELAY_ABORT_SEQ);
 223         out_8(&dev->cr, (I2C_CR_MEN));
 224         udelay(DELAY_ABORT_SEQ);
 225         /* clear status reg */
 226         out_8(&dev->sr, 0);
 227
 228         for (i = 0; i < 5; i++)
 229                 i2c_write_start_seq();
 230         if (ret != 0)
 231                 printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
 232                         nbr_read, last);
 233
 234         return ret;
 235 }
 236 #endif
 237
 238 /**
 239  * i2c_init_board - reset i2c bus. When the board is powercycled during a
 240  * bus transfer it might hang; for details see doc/I2C_Edge_Conditions.
 241  */
 242 void i2c_init_board(void)
 243 {
 244         /* Now run the AbortSequence() */
 245         i2c_make_abort();
 246 }
 247
 248 #if !defined(MACH_TYPE_KM_KIRKWOOD)
 249 int ethernet_present(void)
 250 {
 251         struct km_bec_fpga *base =
 252                 (struct km_bec_fpga *)CONFIG_SYS_KMBEC_FPGA_BASE;
 253
 254         return in_8(&base->bprth) & PIGGY_PRESENT;
 255 }
 256 #endif
 257
 258 int board_eth_init(bd_t *bis)
 259 {
 260         if (ethernet_present())
 261                 return cpu_eth_init(bis);
 262
 263         return -1;
 264 }
 265
 266 /*
 267  * do_setboardid command
 268  * read out the board id and the hw key from the intventory EEPROM and set
 269  * this values as environment variables.
 270  */
 271 static int do_setboardid(cmd_tbl_t *cmdtp, int flag, int argc,
 272                                 char *const argv[])
 273 {
 274         unsigned char buf[32];
 275         char *p;
 276
 277         p = get_local_var("IVM_BoardId");
 278         if (p == NULL) {
 279                 printf("can't get the IVM_Boardid\n");
 280                 return 1;
 281         }
 282         sprintf((char *)buf, "%s", p);
 283         setenv("boardid", (char *)buf);
 284         printf("set boardid=%s\n", buf);
 285
 286         p = get_local_var("IVM_HWKey");
 287         if (p == NULL) {
 288                 printf("can't get the IVM_HWKey\n");
 289                 return 1;
 290         }
 291         sprintf((char *)buf, "%s", p);
 292         setenv("hwkey", (char *)buf);
 293         printf("set hwkey=%s\n", buf);
 294         printf("Execute manually saveenv for persistent storage.\n");
 295
 296         return 0;
 297 }
 298
 299 U_BOOT_CMD(km_setboardid, 1, 0, do_setboardid, "setboardid", "read out bid and "
 300                                  "hwkey from IVM and set in environment");
 301
 302 /*
 303  * command km_checkbidhwk
 304  *      if "boardid" and "hwkey" are not already set in the environment, do:
 305  *              if a "boardIdListHex" exists in the environment:
 306  *                      - read ivm data for boardid and hwkey
 307  *                      - compare each entry of the boardIdListHex with the
 308  *                              IVM data:
 309  *                      if match:
 310  *                              set environment variables boardid, boardId,
 311  *                              hwkey, hwKey to the found values
 312  *                              both (boardid and boardId) are set because
 313  *                              they might be used differently in the
 314  *                              application and in the init scripts (?)
 315  *      return 0 in case of match, 1 if not match or error
 316  */
 317 int do_checkboardidhwk(cmd_tbl_t *cmdtp, int flag, int argc,
 318                         char *const argv[])
 319 {
 320         unsigned long ivmbid = 0, ivmhwkey = 0;
 321         unsigned long envbid = 0, envhwkey = 0;
 322         char *p;
 323         int verbose = argc > 1 && *argv[1] == 'v';
 324         int rc = 0;
 325
 326         /*
 327          * first read out the real inventory values, these values are
 328          * already stored in the local hush variables
 329          */
 330         p = get_local_var("IVM_BoardId");
 331         if (p == NULL) {
 332                 printf("can't get the IVM_Boardid\n");
 333                 return 1;
 334         }
 335         rc = strict_strtoul(p, 16, &ivmbid);
 336
 337         p = get_local_var("IVM_HWKey");
 338         if (p == NULL) {
 339                 printf("can't get the IVM_HWKey\n");
 340                 return 1;
 341         }
 342         rc = strict_strtoul(p, 16, &ivmhwkey);
 343
 344         if (!ivmbid || !ivmhwkey) {
 345                 printf("Error: IVM_BoardId and/or IVM_HWKey not set!\n");
 346                 return rc;
 347         }
 348
 349         /* now try to read values from environment if available */
 350         p = getenv("boardid");
 351         if (p != NULL)
 352                 rc = strict_strtoul(p, 16, &envbid);
 353         p = getenv("hwkey");
 354         if (p != NULL)
 355                 rc = strict_strtoul(p, 16, &envhwkey);
 356
 357         if (rc != 0) {
 358                 printf("strict_strtoul returns error: %d", rc);
 359                 return rc;
 360         }
 361
 362         if (!envbid || !envhwkey) {
 363                 /*
 364                  * BoardId/HWkey not available in the environment, so try the
 365                  * environment variable for BoardId/HWkey list
 366                  */
 367                 char *bidhwklist = getenv("boardIdListHex");
 368
 369                 if (bidhwklist) {
 370                         int found = 0;
 371                         char *rest = bidhwklist;
 372                         char *endp;
 373
 374                         if (verbose) {
 375                                 printf("IVM_BoardId: %ld, IVM_HWKey=%ld\n",
 376                                         ivmbid, ivmhwkey);
 377                                 printf("boardIdHwKeyList: %s\n",
 378                                         bidhwklist);
 379                         }
 380                         while (!found) {
 381                                 /* loop over each bid/hwkey pair in the list */
 382                                 unsigned long bid   = 0;
 383                                 unsigned long hwkey = 0;
 384
 385                                 while (*rest && !isxdigit(*rest))
 386                                         rest++;
 387                                 /*
 388                                  * use simple_strtoul because we need &end and
 389                                  * we know we got non numeric char at the end
 390                                  */
 391                                 bid = simple_strtoul(rest, &endp, 16);
 392                                 /* BoardId and HWkey are separated with a "_" */
 393                                 if (*endp == '_') {
 394                                         rest  = endp + 1;
 395                                         /*
 396                                          * use simple_strtoul because we need
 397                                          * &end
 398                                          */
 399                                         hwkey = simple_strtoul(rest, &endp, 16);
 400                                         rest  = endp;
 401                                         while (*rest && !isxdigit(*rest))
 402                                                 rest++;
 403                                 }
 404                                 if ((!bid) || (!hwkey)) {
 405                                         /* end of list */
 406                                         break;
 407                                 }
 408                                 if (verbose) {
 409                                         printf("trying bid=0x%lX, hwkey=%ld\n",
 410                                                 bid, hwkey);
 411                                 }
 412                                 /*
 413                                  * Compare the values of the found entry in the
 414                                  * list with the valid values which are stored
 415                                  * in the inventory eeprom. If they are equal
 416                                  * set the values in environment variables.
 417                                  */
 418                                 if ((bid == ivmbid) && (hwkey == ivmhwkey)) {
 419                                         char buf[10];
 420
 421                                         found = 1;
 422                                         envbid   = bid;
 423                                         envhwkey = hwkey;
 424                                         sprintf(buf, "%lx", bid);
 425                                         setenv("boardid", buf);
 426                                         sprintf(buf, "%lx", hwkey);
 427                                         setenv("hwkey", buf);
 428                                 }
 429                         } /* end while( ! found ) */
 430                 }
 431         }
 432
 433         /* compare now the values */
 434         if ((ivmbid == envbid) && (ivmhwkey == envhwkey)) {
 435                 printf("boardid=0x%3lX, hwkey=%ld\n", envbid, envhwkey);
 436                 rc = 0; /* match */
 437         } else {
 438                 printf("Error: env boardid=0x%3lX, hwkey=%ld\n", envbid,
 439                         envhwkey);
 440                 printf("       IVM bId=0x%3lX, hwKey=%ld\n", ivmbid, ivmhwkey);
 441                 rc = 1; /* don't match */
 442         }
 443         return rc;
 444 }
 445
 446 U_BOOT_CMD(km_checkbidhwk, 2, 0, do_checkboardidhwk,
 447                 "check boardid and hwkey",
 448                 "[v]\n  - check environment parameter "\
 449                 "\"boardIdListHex\" against stored boardid and hwkey "\
 450                 "from the IVM\n    v: verbose output"
 451 );