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

   1 /*
   2  * Copyright (c) 2013-2014, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/clk.h>
  20 #include <linux/err.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_address.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/random.h>
  27
  28 #include <soc/tegra/fuse.h>
  29
  30 #include "fuse.h"
  31
  32 #define FUSE_BEGIN      0x100
  33
  34 /* Tegra30 and later */
  35 #define FUSE_VENDOR_CODE        0x100
  36 #define FUSE_FAB_CODE           0x104
  37 #define FUSE_LOT_CODE_0         0x108
  38 #define FUSE_LOT_CODE_1         0x10c
  39 #define FUSE_WAFER_ID           0x110
  40 #define FUSE_X_COORDINATE       0x114
  41 #define FUSE_Y_COORDINATE       0x118
  42
  43 #define FUSE_HAS_REVISION_INFO  BIT(0)
  44
  45 #if defined(CONFIG_ARCH_TEGRA_3x_SOC) || \
  46     defined(CONFIG_ARCH_TEGRA_114_SOC) || \
  47     defined(CONFIG_ARCH_TEGRA_124_SOC) || \
  48     defined(CONFIG_ARCH_TEGRA_132_SOC) || \
  49     defined(CONFIG_ARCH_TEGRA_210_SOC) || \
  50     defined(CONFIG_ARCH_TEGRA_186_SOC) || \
  51     defined(CONFIG_ARCH_TEGRA_194_SOC)
  52 static u32 tegra30_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset)
  53 {
  54         if (WARN_ON(!fuse->base))
  55                 return 0;
  56
  57         return readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  58 }
  59
  60 static u32 tegra30_fuse_read(struct tegra_fuse *fuse, unsigned int offset)
  61 {
  62         u32 value;
  63         int err;
  64
  65         err = clk_prepare_enable(fuse->clk);
  66         if (err < 0) {
  67                 dev_err(fuse->dev, "failed to enable FUSE clock: %d\n", err);
  68                 return 0;
  69         }
  70
  71         value = readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  72
  73         clk_disable_unprepare(fuse->clk);
  74
  75         return value;
  76 }
  77
  78 static void __init tegra30_fuse_add_randomness(void)
  79 {
  80         u32 randomness[12];
  81
  82         randomness[0] = tegra_sku_info.sku_id;
  83         randomness[1] = tegra_read_straps();
  84         randomness[2] = tegra_read_chipid();
  85         randomness[3] = tegra_sku_info.cpu_process_id << 16;
  86         randomness[3] |= tegra_sku_info.soc_process_id;
  87         randomness[4] = tegra_sku_info.cpu_speedo_id << 16;
  88         randomness[4] |= tegra_sku_info.soc_speedo_id;
  89         randomness[5] = tegra_fuse_read_early(FUSE_VENDOR_CODE);
  90         randomness[6] = tegra_fuse_read_early(FUSE_FAB_CODE);
  91         randomness[7] = tegra_fuse_read_early(FUSE_LOT_CODE_0);
  92         randomness[8] = tegra_fuse_read_early(FUSE_LOT_CODE_1);
  93         randomness[9] = tegra_fuse_read_early(FUSE_WAFER_ID);
  94         randomness[10] = tegra_fuse_read_early(FUSE_X_COORDINATE);
  95         randomness[11] = tegra_fuse_read_early(FUSE_Y_COORDINATE);
  96
  97         add_device_randomness(randomness, sizeof(randomness));
  98 }
  99
 100 static void __init tegra30_fuse_init(struct tegra_fuse *fuse)
 101 {
 102         fuse->read_early = tegra30_fuse_read_early;
 103         fuse->read = tegra30_fuse_read;
 104
 105         tegra_init_revision();
 106
 107         if (fuse->soc->speedo_init)
 108                 fuse->soc->speedo_init(&tegra_sku_info);
 109
 110         tegra30_fuse_add_randomness();
 111 }
 112 #endif
 113
 114 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 115 static const struct tegra_fuse_info tegra30_fuse_info = {
 116         .read = tegra30_fuse_read,
 117         .size = 0x2a4,
 118         .spare = 0x144,
 119 };
 120
 121 const struct tegra_fuse_soc tegra30_fuse_soc = {
 122         .init = tegra30_fuse_init,
 123         .speedo_init = tegra30_init_speedo_data,
 124         .info = &tegra30_fuse_info,
 125 };
 126 #endif
 127
 128 #ifdef CONFIG_ARCH_TEGRA_114_SOC
 129 static const struct tegra_fuse_info tegra114_fuse_info = {
 130         .read = tegra30_fuse_read,
 131         .size = 0x2a0,
 132         .spare = 0x180,
 133 };
 134
 135 const struct tegra_fuse_soc tegra114_fuse_soc = {
 136         .init = tegra30_fuse_init,
 137         .speedo_init = tegra114_init_speedo_data,
 138         .info = &tegra114_fuse_info,
 139 };
 140 #endif
 141
 142 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
 143 static const struct tegra_fuse_info tegra124_fuse_info = {
 144         .read = tegra30_fuse_read,
 145         .size = 0x300,
 146         .spare = 0x200,
 147 };
 148
 149 const struct tegra_fuse_soc tegra124_fuse_soc = {
 150         .init = tegra30_fuse_init,
 151         .speedo_init = tegra124_init_speedo_data,
 152         .info = &tegra124_fuse_info,
 153 };
 154 #endif
 155
 156 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
 157 static const struct tegra_fuse_info tegra210_fuse_info = {
 158         .read = tegra30_fuse_read,
 159         .size = 0x300,
 160         .spare = 0x280,
 161 };
 162
 163 const struct tegra_fuse_soc tegra210_fuse_soc = {
 164         .init = tegra30_fuse_init,
 165         .speedo_init = tegra210_init_speedo_data,
 166         .info = &tegra210_fuse_info,
 167 };
 168 #endif
 169
 170 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
 171 static const struct tegra_fuse_info tegra186_fuse_info = {
 172         .read = tegra30_fuse_read,
 173         .size = 0x300,
 174         .spare = 0x280,
 175 };
 176
 177 const struct tegra_fuse_soc tegra186_fuse_soc = {
 178         .init = tegra30_fuse_init,
 179         .info = &tegra186_fuse_info,
 180 };
 181 #endif