kernel/drivers/soc/tegra/fuse/speedo-tegra210.c

   1 /*
   2  * Copyright (c) 2013-2015, 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 #include <linux/device.h>
  18 #include <linux/kernel.h>
  19 #include <linux/bug.h>
  20
  21 #include <soc/tegra/fuse.h>
  22
  23 #include "fuse.h"
  24
  25 #define CPU_PROCESS_CORNERS     2
  26 #define GPU_PROCESS_CORNERS     2
  27 #define SOC_PROCESS_CORNERS     3
  28
  29 #define FUSE_CPU_SPEEDO_0       0x014
  30 #define FUSE_CPU_SPEEDO_1       0x02c
  31 #define FUSE_CPU_SPEEDO_2       0x030
  32 #define FUSE_SOC_SPEEDO_0       0x034
  33 #define FUSE_SOC_SPEEDO_1       0x038
  34 #define FUSE_SOC_SPEEDO_2       0x03c
  35 #define FUSE_CPU_IDDQ           0x018
  36 #define FUSE_SOC_IDDQ           0x040
  37 #define FUSE_GPU_IDDQ           0x128
  38 #define FUSE_FT_REV             0x028
  39
  40 enum {
  41         THRESHOLD_INDEX_0,
  42         THRESHOLD_INDEX_1,
  43         THRESHOLD_INDEX_COUNT,
  44 };
  45
  46 static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
  47         { 2119, UINT_MAX },
  48         { 2119, UINT_MAX },
  49 };
  50
  51 static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {
  52         { UINT_MAX, UINT_MAX },
  53         { UINT_MAX, UINT_MAX },
  54 };
  55
  56 static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {
  57         { 1950, 2100, UINT_MAX },
  58         { 1950, 2100, UINT_MAX },
  59 };
  60
  61 static u8 __init get_speedo_revision(void)
  62 {
  63         return tegra_fuse_read_spare(4) << 2 |
  64                tegra_fuse_read_spare(3) << 1 |
  65                tegra_fuse_read_spare(2) << 0;
  66 }
  67
  68 static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
  69                                          u8 speedo_rev, int *threshold)
  70 {
  71         int sku = sku_info->sku_id;
  72
  73         /* Assign to default */
  74         sku_info->cpu_speedo_id = 0;
  75         sku_info->soc_speedo_id = 0;
  76         sku_info->gpu_speedo_id = 0;
  77         *threshold = THRESHOLD_INDEX_0;
  78
  79         switch (sku) {
  80         case 0x00: /* Engineering SKU */
  81         case 0x01: /* Engineering SKU */
  82         case 0x07:
  83         case 0x17:
  84         case 0x27:
  85                 if (speedo_rev >= 2)
  86                         sku_info->gpu_speedo_id = 1;
  87                 break;
  88
  89         case 0x13:
  90                 if (speedo_rev >= 2)
  91                         sku_info->gpu_speedo_id = 1;
  92
  93                 sku_info->cpu_speedo_id = 1;
  94                 break;
  95
  96         default:
  97                 pr_err("Tegra210: unknown SKU %#04x\n", sku);
  98                 /* Using the default for the error case */
  99                 break;
 100         }
 101 }
 102
 103 static int get_process_id(int value, const u32 *speedos, unsigned int num)
 104 {
 105         unsigned int i;
 106
 107         for (i = 0; i < num; i++)
 108                 if (value < speedos[num])
 109                         return i;
 110
 111         return -EINVAL;
 112 }
 113
 114 void __init tegra210_init_speedo_data(struct tegra_sku_info *sku_info)
 115 {
 116         int cpu_speedo[3], soc_speedo[3], cpu_iddq, gpu_iddq, soc_iddq;
 117         unsigned int index;
 118         u8 speedo_revision;
 119
 120         BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
 121                         THRESHOLD_INDEX_COUNT);
 122         BUILD_BUG_ON(ARRAY_SIZE(gpu_process_speedos) !=
 123                         THRESHOLD_INDEX_COUNT);
 124         BUILD_BUG_ON(ARRAY_SIZE(soc_process_speedos) !=
 125                         THRESHOLD_INDEX_COUNT);
 126
 127         /* Read speedo/IDDQ fuses */
 128         cpu_speedo[0] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_0);
 129         cpu_speedo[1] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_1);
 130         cpu_speedo[2] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_2);
 131
 132         soc_speedo[0] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_0);
 133         soc_speedo[1] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_1);
 134         soc_speedo[2] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_2);
 135
 136         cpu_iddq = tegra_fuse_read_early(FUSE_CPU_IDDQ) * 4;
 137         soc_iddq = tegra_fuse_read_early(FUSE_SOC_IDDQ) * 4;
 138         gpu_iddq = tegra_fuse_read_early(FUSE_GPU_IDDQ) * 5;
 139
 140         /*
 141          * Determine CPU, GPU and SoC speedo values depending on speedo fusing
 142          * revision. Note that GPU speedo value is fused in CPU_SPEEDO_2.
 143          */
 144         speedo_revision = get_speedo_revision();
 145         pr_info("Speedo Revision %u\n", speedo_revision);
 146
 147         if (speedo_revision >= 3) {
 148                 sku_info->cpu_speedo_value = cpu_speedo[0];
 149                 sku_info->gpu_speedo_value = cpu_speedo[2];
 150                 sku_info->soc_speedo_value = soc_speedo[0];
 151         } else if (speedo_revision == 2) {
 152                 sku_info->cpu_speedo_value = (-1938 + (1095 * cpu_speedo[0] / 100)) / 10;
 153                 sku_info->gpu_speedo_value = (-1662 + (1082 * cpu_speedo[2] / 100)) / 10;
 154                 sku_info->soc_speedo_value = ( -705 + (1037 * soc_speedo[0] / 100)) / 10;
 155         } else {
 156                 sku_info->cpu_speedo_value = 2100;
 157                 sku_info->gpu_speedo_value = cpu_speedo[2] - 75;
 158                 sku_info->soc_speedo_value = 1900;
 159         }
 160
 161         if ((sku_info->cpu_speedo_value <= 0) ||
 162             (sku_info->gpu_speedo_value <= 0) ||
 163             (sku_info->soc_speedo_value <= 0)) {
 164                 WARN(1, "speedo value not fused\n");
 165                 return;
 166         }
 167
 168         rev_sku_to_speedo_ids(sku_info, speedo_revision, &index);
 169
 170         sku_info->gpu_process_id = get_process_id(sku_info->gpu_speedo_value,
 171                                                   gpu_process_speedos[index],
 172                                                   GPU_PROCESS_CORNERS);
 173
 174         sku_info->cpu_process_id = get_process_id(sku_info->cpu_speedo_value,
 175                                                   cpu_process_speedos[index],
 176                                                   CPU_PROCESS_CORNERS);
 177
 178         sku_info->soc_process_id = get_process_id(sku_info->soc_speedo_value,
 179                                                   soc_process_speedos[index],
 180                                                   SOC_PROCESS_CORNERS);
 181
 182         pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",
 183                  sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);
 184 }