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