src/soc/intel/broadwell/spd.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <cbfs.h>
   4 #include <console/console.h>
   5 #include <soc/pei_data.h>
   6 #include <soc/pei_wrapper.h>
   7 #include <string.h>
   8 #include <types.h>
   9
  10 #define SPD_DRAM_TYPE           2
  11 #define SPD_DRAM_DDR3           0x0b
  12 #define SPD_DRAM_LPDDR3         0xf1
  13 #define SPD_DENSITY_BANKS       4
  14 #define SPD_ADDRESSING          5
  15 #define SPD_ORGANIZATION        7
  16 #define SPD_BUS_DEV_WIDTH       8
  17 #define SPD_PART_OFF            128
  18 #define SPD_PART_LEN            18
  19
  20 #define SPD_LEN                 256
  21
  22 static void print_spd_info(uint8_t spd[])
  23 {
  24         const int spd_banks[8] = {  8, 16, 32, 64, -1, -1, -1, -1 };
  25         const int spd_capmb[8] = {  1,  2,  4,  8, 16, 32, 64,  0 };
  26         const int spd_rows[8]  = { 12, 13, 14, 15, 16, -1, -1, -1 };
  27         const int spd_cols[8]  = {  9, 10, 11, 12, -1, -1, -1, -1 };
  28         const int spd_ranks[8] = {  1,  2,  3,  4, -1, -1, -1, -1 };
  29         const int spd_devw[8]  = {  4,  8, 16, 32, -1, -1, -1, -1 };
  30         const int spd_busw[8]  = {  8, 16, 32, 64, -1, -1, -1, -1 };
  31         char spd_name[SPD_PART_LEN+1] = { 0 };
  32
  33         int banks = spd_banks[(spd[SPD_DENSITY_BANKS] >> 4) & 7];
  34         int capmb = spd_capmb[spd[SPD_DENSITY_BANKS] & 7] * 256;
  35         int rows  = spd_rows[(spd[SPD_ADDRESSING] >> 3) & 7];
  36         int cols  = spd_cols[spd[SPD_ADDRESSING] & 7];
  37         int ranks = spd_ranks[(spd[SPD_ORGANIZATION] >> 3) & 7];
  38         int devw  = spd_devw[spd[SPD_ORGANIZATION] & 7];
  39         int busw  = spd_busw[spd[SPD_BUS_DEV_WIDTH] & 7];
  40
  41         /* Module type */
  42         printk(BIOS_INFO, "SPD: module type is ");
  43         switch (spd[SPD_DRAM_TYPE]) {
  44         case SPD_DRAM_DDR3:
  45                 printk(BIOS_INFO, "DDR3\n");
  46                 break;
  47         case SPD_DRAM_LPDDR3:
  48                 printk(BIOS_INFO, "LPDDR3\n");
  49                 break;
  50         default:
  51                 printk(BIOS_INFO, "Unknown (%02x)\n", spd[SPD_DRAM_TYPE]);
  52                 break;
  53         }
  54
  55         /* Module Part Number */
  56         memcpy(spd_name, &spd[SPD_PART_OFF], SPD_PART_LEN);
  57         spd_name[SPD_PART_LEN] = 0;
  58         printk(BIOS_INFO, "SPD: module part is %s\n", spd_name);
  59
  60         printk(BIOS_INFO, "SPD: banks %d, ranks %d, rows %d, columns %d, "
  61                "density %d Mb\n", banks, ranks, rows, cols, capmb);
  62         printk(BIOS_INFO, "SPD: device width %d bits, bus width %d bits\n",
  63                devw, busw);
  64
  65         if (capmb > 0 && busw > 0 && devw > 0 && ranks > 0) {
  66                 /* SIZE = DENSITY / 8 * BUS_WIDTH / SDRAM_WIDTH * RANKS */
  67                 printk(BIOS_INFO, "SPD: module size is %u MB (per channel)\n",
  68                        capmb / 8 * busw / devw * ranks);
  69         }
  70 }
  71
  72 void copy_spd(struct pei_data *pei_data, struct spd_info *spdi)
  73 {
  74         size_t spd_file_len;
  75         uint8_t *spd_file = cbfs_map("spd.bin", &spd_file_len);
  76
  77         printk(BIOS_DEBUG, "SPD index %d\n", spdi->spd_index);
  78
  79         if (!spd_file)
  80                 die("SPD data not found.");
  81
  82         if (spd_file_len < SPD_LEN)
  83                 die("Missing SPD data.");
  84
  85         if (spd_file_len < ((spdi->spd_index + 1) * SPD_LEN)) {
  86                 printk(BIOS_ERR, "SPD index override to 0 - old hardware?\n");
  87                 spdi->spd_index = 0;
  88         }
  89
  90         uint8_t *const spd = spd_file + (spdi->spd_index * SPD_LEN);
  91
  92         /* Make sure a valid SPD was found */
  93         if (spd[0] == 0)
  94                 die("Invalid SPD data.");
  95
  96         print_spd_info(spd);
  97
  98         for (size_t i = 0; i < ARRAY_SIZE(spdi->addresses); i++) {
  99                 if (spdi->addresses[i] == SPD_MEMORY_DOWN)
 100                         memcpy(pei_data->spd_data[i / 2][i % 2], spd, SPD_LEN);
 101         }
 102 }