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 static u32 tegra30_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset)
  52 {
  53         if (WARN_ON(!fuse->base))
  54                 return 0;
  55
  56         return readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  57 }
  58
  59 static u32 tegra30_fuse_read(struct tegra_fuse *fuse, unsigned int offset)
  60 {
  61         u32 value;
  62         int err;
  63
  64         err = clk_prepare_enable(fuse->clk);
  65         if (err < 0) {
  66                 dev_err(fuse->dev, "failed to enable FUSE clock: %d\n", err);
  67                 return 0;
  68         }
  69
  70         value = readl_relaxed(fuse->base + FUSE_BEGIN + offset);
  71
  72         clk_disable_unprepare(fuse->clk);
  73
  74         return value;
  75 }
  76
  77 static void __init tegra30_fuse_add_randomness(void)
  78 {
  79         u32 randomness[12];
  80
  81         randomness[0] = tegra_sku_info.sku_id;
  82         randomness[1] = tegra_read_straps();
  83         randomness[2] = tegra_read_chipid();
  84         randomness[3] = tegra_sku_info.cpu_process_id << 16;
  85         randomness[3] |= tegra_sku_info.soc_process_id;
  86         randomness[4] = tegra_sku_info.cpu_speedo_id << 16;
  87         randomness[4] |= tegra_sku_info.soc_speedo_id;
  88         randomness[5] = tegra_fuse_read_early(FUSE_VENDOR_CODE);
  89         randomness[6] = tegra_fuse_read_early(FUSE_FAB_CODE);
  90         randomness[7] = tegra_fuse_read_early(FUSE_LOT_CODE_0);
  91         randomness[8] = tegra_fuse_read_early(FUSE_LOT_CODE_1);
  92         randomness[9] = tegra_fuse_read_early(FUSE_WAFER_ID);
  93         randomness[10] = tegra_fuse_read_early(FUSE_X_COORDINATE);
  94         randomness[11] = tegra_fuse_read_early(FUSE_Y_COORDINATE);
  95
  96         add_device_randomness(randomness, sizeof(randomness));
  97 }
  98
  99 static void __init tegra30_fuse_init(struct tegra_fuse *fuse)
 100 {
 101         fuse->read_early = tegra30_fuse_read_early;
 102         fuse->read = tegra30_fuse_read;
 103
 104         tegra_init_revision();
 105
 106         if (fuse->soc->speedo_init)
 107                 fuse->soc->speedo_init(&tegra_sku_info);
 108
 109         tegra30_fuse_add_randomness();
 110 }
 111 #endif
 112
 113 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 114 static const struct tegra_fuse_info tegra30_fuse_info = {
 115         .read = tegra30_fuse_read,
 116         .size = 0x2a4,
 117         .spare = 0x144,
 118 };
 119
 120 const struct tegra_fuse_soc tegra30_fuse_soc = {
 121         .init = tegra30_fuse_init,
 122         .speedo_init = tegra30_init_speedo_data,
 123         .info = &tegra30_fuse_info,
 124 };
 125 #endif
 126
 127 #ifdef CONFIG_ARCH_TEGRA_114_SOC
 128 static const struct tegra_fuse_info tegra114_fuse_info = {
 129         .read = tegra30_fuse_read,
 130         .size = 0x2a0,
 131         .spare = 0x180,
 132 };
 133
 134 const struct tegra_fuse_soc tegra114_fuse_soc = {
 135         .init = tegra30_fuse_init,
 136         .speedo_init = tegra114_init_speedo_data,
 137         .info = &tegra114_fuse_info,
 138 };
 139 #endif
 140
 141 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
 142 static const struct tegra_fuse_info tegra124_fuse_info = {
 143         .read = tegra30_fuse_read,
 144         .size = 0x300,
 145         .spare = 0x200,
 146 };
 147
 148 const struct tegra_fuse_soc tegra124_fuse_soc = {
 149         .init = tegra30_fuse_init,
 150         .speedo_init = tegra124_init_speedo_data,
 151         .info = &tegra124_fuse_info,
 152 };
 153 #endif
 154
 155 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
 156 static const struct tegra_fuse_info tegra210_fuse_info = {
 157         .read = tegra30_fuse_read,
 158         .size = 0x300,
 159         .spare = 0x280,
 160 };
 161
 162 const struct tegra_fuse_soc tegra210_fuse_soc = {
 163         .init = tegra30_fuse_init,
 164         .speedo_init = tegra210_init_speedo_data,
 165         .info = &tegra210_fuse_info,
 166 };
 167 #endif
 168
 169 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
 170 static const struct tegra_fuse_info tegra186_fuse_info = {
 171         .read = tegra30_fuse_read,
 172         .size = 0x300,
 173         .spare = 0x280,
 174 };
 175
 176 const struct tegra_fuse_soc tegra186_fuse_soc = {
 177         .init = tegra30_fuse_init,
 178         .info = &tegra186_fuse_info,
 179 };
 180 #endif