board/ti/common/board_detect.c

   1 /*
   2  * Library to support early TI EVM EEPROM handling
   3  *
   4  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Lokesh Vutla
   6  *      Steve Kipisz
   7  *
   8  * SPDX-License-Identifier:    GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <asm/omap_common.h>
  13 #include <i2c.h>
  14
  15 #include "board_detect.h"
  16
  17 /**
  18  * ti_i2c_eeprom_init - Initialize an i2c bus and probe for a device
  19  * @i2c_bus: i2c bus number to initialize
  20  * @dev_addr: Device address to probe for
  21  *
  22  * Return: 0 on success or corresponding error on failure.
  23  */
  24 static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
  25 {
  26         int rc;
  27
  28         if (i2c_bus >= 0) {
  29                 rc = i2c_set_bus_num(i2c_bus);
  30                 if (rc)
  31                         return rc;
  32         }
  33
  34         return i2c_probe(dev_addr);
  35 }
  36
  37 /**
  38  * ti_i2c_eeprom_read - Read data from an EEPROM
  39  * @dev_addr: The device address of the EEPROM
  40  * @offset: Offset to start reading in the EEPROM
  41  * @ep: Pointer to a buffer to read into
  42  * @epsize: Size of buffer
  43  *
  44  * Return: 0 on success or corresponding result of i2c_read
  45  */
  46 static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
  47                                              uchar *ep, int epsize)
  48 {
  49         return i2c_read(dev_addr, offset, 2, ep, epsize);
  50 }
  51
  52 /**
  53  * ti_eeprom_string_cleanup() - Handle eeprom programming errors
  54  * @s:  eeprom string (should be NULL terminated)
  55  *
  56  * Some Board manufacturers do not add a NULL termination at the
  57  * end of string, instead some binary information is kludged in, hence
  58  * convert the string to just printable characters of ASCII chart.
  59  */
  60 static void __maybe_unused ti_eeprom_string_cleanup(char *s)
  61 {
  62         int i, l;
  63
  64         l = strlen(s);
  65         for (i = 0; i < l; i++, s++)
  66                 if (*s < ' ' || *s > '~') {
  67                         *s = 0;
  68                         break;
  69                 }
  70 }
  71
  72 __weak void gpi2c_init(void)
  73 {
  74 }
  75
  76 static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
  77                                             u32 header, u32 size, uint8_t *ep)
  78 {
  79         u32 byte, hdr_read;
  80         int rc;
  81
  82         gpi2c_init();
  83         rc = ti_i2c_eeprom_init(bus_addr, dev_addr);
  84         if (rc)
  85                 return rc;
  86
  87         /*
  88          * Read the header first then only read the other contents.
  89          */
  90         byte = 2;
  91         rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
  92         if (rc)
  93                 return rc;
  94
  95         /* Corrupted data??? */
  96         if (hdr_read != header) {
  97                 rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
  98                 /*
  99                  * read the eeprom header using i2c again, but use only a
 100                  * 1 byte address (some legacy boards need this..)
 101                  */
 102                 byte = 1;
 103                 if (rc)
 104                         rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
 105                                       4);
 106                 if (rc)
 107                         return rc;
 108         }
 109         if (hdr_read != header)
 110                 return -1;
 111
 112         rc = i2c_read(dev_addr, 0x0, byte, ep, size);
 113         if (rc)
 114                 return rc;
 115
 116         return 0;
 117 }
 118
 119 int __maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr)
 120 {
 121         int rc;
 122         struct ti_am_eeprom am_ep;
 123         struct ti_common_eeprom *ep;
 124
 125         ep = TI_EEPROM_DATA;
 126 #ifndef CONFIG_SPL_BUILD
 127         if (ep->header == TI_EEPROM_HEADER_MAGIC)
 128                 return 0; /* EEPROM has already been read */
 129 #endif
 130
 131         /* Initialize with a known bad marker for i2c fails.. */
 132         ep->header = TI_DEAD_EEPROM_MAGIC;
 133         ep->name[0] = 0x0;
 134         ep->version[0] = 0x0;
 135         ep->serial[0] = 0x0;
 136         ep->config[0] = 0x0;
 137
 138         rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,
 139                                sizeof(am_ep), (uint8_t *)&am_ep);
 140         if (rc)
 141                 return rc;
 142
 143         ep->header = am_ep.header;
 144         strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
 145         ti_eeprom_string_cleanup(ep->name);
 146
 147         /* BeagleBone Green '1' eeprom, board_rev: 0x1a 0x00 0x00 0x00 */
 148         if (am_ep.version[0] == 0x1a && am_ep.version[1] == 0x00 &&
 149             am_ep.version[2] == 0x00 && am_ep.version[3] == 0x00)
 150                 strlcpy(ep->version, "BBG1", TI_EEPROM_HDR_REV_LEN + 1);
 151         else
 152                 strlcpy(ep->version, am_ep.version, TI_EEPROM_HDR_REV_LEN + 1);
 153         ti_eeprom_string_cleanup(ep->version);
 154         strlcpy(ep->serial, am_ep.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
 155         ti_eeprom_string_cleanup(ep->serial);
 156         strlcpy(ep->config, am_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
 157         ti_eeprom_string_cleanup(ep->config);
 158
 159         memcpy(ep->mac_addr, am_ep.mac_addr,
 160                TI_EEPROM_HDR_NO_OF_MAC_ADDR * TI_EEPROM_HDR_ETH_ALEN);
 161
 162         return 0;
 163 }
 164
 165 int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
 166 {
 167         int rc, offset = 0;
 168         struct dra7_eeprom dra7_ep;
 169         struct ti_common_eeprom *ep;
 170
 171         ep = TI_EEPROM_DATA;
 172 #ifndef CONFIG_SPL_BUILD
 173         if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
 174                 return 0; /* EEPROM has already been read */
 175 #endif
 176
 177         /* Initialize with a known bad marker for i2c fails.. */
 178         ep->header = TI_DEAD_EEPROM_MAGIC;
 179         ep->name[0] = 0x0;
 180         ep->version[0] = 0x0;
 181         ep->serial[0] = 0x0;
 182         ep->config[0] = 0x0;
 183         ep->emif1_size = 0;
 184         ep->emif2_size = 0;
 185
 186         rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
 187                                sizeof(dra7_ep), (uint8_t *)&dra7_ep);
 188         if (rc)
 189                 return rc;
 190
 191         ep->header = dra7_ep.header;
 192         strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
 193         ti_eeprom_string_cleanup(ep->name);
 194
 195         offset = dra7_ep.version_major - 1;
 196
 197         /* Rev F is skipped */
 198         if (offset >= 5)
 199                 offset = offset + 1;
 200         snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
 201                  'A' + offset, dra7_ep.version_minor);
 202         ti_eeprom_string_cleanup(ep->version);
 203         ep->emif1_size = (u64)dra7_ep.emif1_size;
 204         ep->emif2_size = (u64)dra7_ep.emif2_size;
 205         strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
 206         ti_eeprom_string_cleanup(ep->config);
 207
 208         return 0;
 209 }
 210
 211 bool __maybe_unused board_ti_is(char *name_tag)
 212 {
 213         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 214
 215         if (ep->header == TI_DEAD_EEPROM_MAGIC)
 216                 return false;
 217         return !strncmp(ep->name, name_tag, TI_EEPROM_HDR_NAME_LEN);
 218 }
 219
 220 bool __maybe_unused board_ti_rev_is(char *rev_tag, int cmp_len)
 221 {
 222         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 223         int l;
 224
 225         if (ep->header == TI_DEAD_EEPROM_MAGIC)
 226                 return false;
 227
 228         l = cmp_len > TI_EEPROM_HDR_REV_LEN ? TI_EEPROM_HDR_REV_LEN : cmp_len;
 229         return !strncmp(ep->version, rev_tag, l);
 230 }
 231
 232 char * __maybe_unused board_ti_get_rev(void)
 233 {
 234         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 235
 236         /* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 237         return ep->version;
 238 }
 239
 240 char * __maybe_unused board_ti_get_config(void)
 241 {
 242         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 243
 244         /* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 245         return ep->config;
 246 }
 247
 248 char * __maybe_unused board_ti_get_name(void)
 249 {
 250         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 251
 252         /* if ep->header == TI_DEAD_EEPROM_MAGIC, this is empty already */
 253         return ep->name;
 254 }
 255
 256 void __maybe_unused
 257 board_ti_get_eth_mac_addr(int index,
 258                           u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN])
 259 {
 260         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 261
 262         if (ep->header == TI_DEAD_EEPROM_MAGIC)
 263                 goto fail;
 264
 265         if (index < 0 || index >= TI_EEPROM_HDR_NO_OF_MAC_ADDR)
 266                 goto fail;
 267
 268         memcpy(mac_addr, ep->mac_addr[index], TI_EEPROM_HDR_ETH_ALEN);
 269         return;
 270
 271 fail:
 272         memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
 273 }
 274
 275 u64 __maybe_unused board_ti_get_emif1_size(void)
 276 {
 277         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 278
 279         if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
 280                 return 0;
 281
 282         return ep->emif1_size;
 283 }
 284
 285 u64 __maybe_unused board_ti_get_emif2_size(void)
 286 {
 287         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 288
 289         if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
 290                 return 0;
 291
 292         return ep->emif2_size;
 293 }
 294
 295 void __maybe_unused set_board_info_env(char *name)
 296 {
 297         char *unknown = "unknown";
 298         struct ti_common_eeprom *ep = TI_EEPROM_DATA;
 299
 300         if (name)
 301                 setenv("board_name", name);
 302         else if (ep->name)
 303                 setenv("board_name", ep->name);
 304         else
 305                 setenv("board_name", unknown);
 306
 307         if (ep->version)
 308                 setenv("board_rev", ep->version);
 309         else
 310                 setenv("board_rev", unknown);
 311
 312         if (ep->serial)
 313                 setenv("board_serial", ep->serial);
 314         else
 315                 setenv("board_serial", unknown);
 316 }