drivers/soc/tegra/fuse/fuse-tegra30.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2013-2014, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/clk.h>
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/kernel.h>
  11 #include <linux/of_device.h>
  12 #include <linux/of_address.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/random.h>
  15
  16 #include <soc/tegra/fuse.h>
  17
  18 #include "fuse.h"
  19
  20 #define FUSE_BEGIN      0x100
  21
  22 /* Tegra30 and later */
  23 #define FUSE_VENDOR_CODE        0x100
  24 #define FUSE_FAB_CODE           0x104
  25 #define FUSE_LOT_CODE_0         0x108
  26 #define FUSE_LOT_CODE_1         0x10c
  27 #define FUSE_WAFER_ID           0x110
  28 #define FUSE_X_COORDINATE       0x114
  29 #define FUSE_Y_COORDINATE       0x118
  30
  31 #define FUSE_HAS_REVISION_INFO  BIT(0)
  32
  33 #if defined(CONFIG_ARCH_TEGRA_3x_SOC) || \
  34     defined(CONFIG_ARCH_TEGRA_114_SOC) || \
  35     defined(CONFIG_ARCH_TEGRA_124_SOC) || \
  36     defined(CONFIG_ARCH_TEGRA_132_SOC) || \
  37     defined(CONFIG_ARCH_TEGRA_210_SOC) || \
  38     defined(CONFIG_ARCH_TEGRA_186_SOC) || \
  39     defined(CONFIG_ARCH_TEGRA_194_SOC)
  40 static u32 tegra30_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset)
  41 {
  42         if (WARN_ON(!fuse->base))
  43                 return 0;
  44
  45         return readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  46 }
  47
  48 static u32 tegra30_fuse_read(struct tegra_fuse *fuse, unsigned int offset)
  49 {
  50         u32 value;
  51         int err;
  52
  53         err = clk_prepare_enable(fuse->clk);
  54         if (err < 0) {
  55                 dev_err(fuse->dev, "failed to enable FUSE clock: %d\n", err);
  56                 return 0;
  57         }
  58
  59         value = readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  60
  61         clk_disable_unprepare(fuse->clk);
  62
  63         return value;
  64 }
  65
  66 static void __init tegra30_fuse_add_randomness(void)
  67 {
  68         u32 randomness[12];
  69
  70         randomness[0] = tegra_sku_info.sku_id;
  71         randomness[1] = tegra_read_straps();
  72         randomness[2] = tegra_read_chipid();
  73         randomness[3] = tegra_sku_info.cpu_process_id << 16;
  74         randomness[3] |= tegra_sku_info.soc_process_id;
  75         randomness[4] = tegra_sku_info.cpu_speedo_id << 16;
  76         randomness[4] |= tegra_sku_info.soc_speedo_id;
  77         randomness[5] = tegra_fuse_read_early(FUSE_VENDOR_CODE);
  78         randomness[6] = tegra_fuse_read_early(FUSE_FAB_CODE);
  79         randomness[7] = tegra_fuse_read_early(FUSE_LOT_CODE_0);
  80         randomness[8] = tegra_fuse_read_early(FUSE_LOT_CODE_1);
  81         randomness[9] = tegra_fuse_read_early(FUSE_WAFER_ID);
  82         randomness[10] = tegra_fuse_read_early(FUSE_X_COORDINATE);
  83         randomness[11] = tegra_fuse_read_early(FUSE_Y_COORDINATE);
  84
  85         add_device_randomness(randomness, sizeof(randomness));
  86 }
  87
  88 static void __init tegra30_fuse_init(struct tegra_fuse *fuse)
  89 {
  90         fuse->read_early = tegra30_fuse_read_early;
  91         fuse->read = tegra30_fuse_read;
  92
  93         tegra_init_revision();
  94
  95         if (fuse->soc->speedo_init)
  96                 fuse->soc->speedo_init(&tegra_sku_info);
  97
  98         tegra30_fuse_add_randomness();
  99 }
 100 #endif
 101
 102 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 103 static const struct tegra_fuse_info tegra30_fuse_info = {
 104         .read = tegra30_fuse_read,
 105         .size = 0x2a4,
 106         .spare = 0x144,
 107 };
 108
 109 const struct tegra_fuse_soc tegra30_fuse_soc = {
 110         .init = tegra30_fuse_init,
 111         .speedo_init = tegra30_init_speedo_data,
 112         .info = &tegra30_fuse_info,
 113 };
 114 #endif
 115
 116 #ifdef CONFIG_ARCH_TEGRA_114_SOC
 117 static const struct tegra_fuse_info tegra114_fuse_info = {
 118         .read = tegra30_fuse_read,
 119         .size = 0x2a0,
 120         .spare = 0x180,
 121 };
 122
 123 const struct tegra_fuse_soc tegra114_fuse_soc = {
 124         .init = tegra30_fuse_init,
 125         .speedo_init = tegra114_init_speedo_data,
 126         .info = &tegra114_fuse_info,
 127 };
 128 #endif
 129
 130 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
 131 static const struct tegra_fuse_info tegra124_fuse_info = {
 132         .read = tegra30_fuse_read,
 133         .size = 0x300,
 134         .spare = 0x200,
 135 };
 136
 137 const struct tegra_fuse_soc tegra124_fuse_soc = {
 138         .init = tegra30_fuse_init,
 139         .speedo_init = tegra124_init_speedo_data,
 140         .info = &tegra124_fuse_info,
 141 };
 142 #endif
 143
 144 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
 145 static const struct tegra_fuse_info tegra210_fuse_info = {
 146         .read = tegra30_fuse_read,
 147         .size = 0x300,
 148         .spare = 0x280,
 149 };
 150
 151 const struct tegra_fuse_soc tegra210_fuse_soc = {
 152         .init = tegra30_fuse_init,
 153         .speedo_init = tegra210_init_speedo_data,
 154         .info = &tegra210_fuse_info,
 155 };
 156 #endif
 157
 158 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
 159 static const struct tegra_fuse_info tegra186_fuse_info = {
 160         .read = tegra30_fuse_read,
 161         .size = 0x300,
 162         .spare = 0x280,
 163 };
 164
 165 const struct tegra_fuse_soc tegra186_fuse_soc = {
 166         .init = tegra30_fuse_init,
 167         .info = &tegra186_fuse_info,
 168 };
 169 #endif