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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2013-2015, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/kernel.h>
   8 #include <linux/bug.h>
   9
  10 #include <soc/tegra/fuse.h>
  11
  12 #include "fuse.h"
  13
  14 #define CPU_PROCESS_CORNERS     2
  15 #define GPU_PROCESS_CORNERS     2
  16 #define SOC_PROCESS_CORNERS     3
  17
  18 #define FUSE_CPU_SPEEDO_0       0x014
  19 #define FUSE_CPU_SPEEDO_1       0x02c
  20 #define FUSE_CPU_SPEEDO_2       0x030
  21 #define FUSE_SOC_SPEEDO_0       0x034
  22 #define FUSE_SOC_SPEEDO_1       0x038
  23 #define FUSE_SOC_SPEEDO_2       0x03c
  24 #define FUSE_CPU_IDDQ           0x018
  25 #define FUSE_SOC_IDDQ           0x040
  26 #define FUSE_GPU_IDDQ           0x128
  27 #define FUSE_FT_REV             0x028
  28
  29 enum {
  30         THRESHOLD_INDEX_0,
  31         THRESHOLD_INDEX_1,
  32         THRESHOLD_INDEX_COUNT,
  33 };
  34
  35 static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
  36         { 2119, UINT_MAX },
  37         { 2119, UINT_MAX },
  38 };
  39
  40 static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {
  41         { UINT_MAX, UINT_MAX },
  42         { UINT_MAX, UINT_MAX },
  43 };
  44
  45 static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {
  46         { 1950, 2100, UINT_MAX },
  47         { 1950, 2100, UINT_MAX },
  48 };
  49
  50 static u8 __init get_speedo_revision(void)
  51 {
  52         return tegra_fuse_read_spare(4) << 2 |
  53                tegra_fuse_read_spare(3) << 1 |
  54                tegra_fuse_read_spare(2) << 0;
  55 }
  56
  57 static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
  58                                          u8 speedo_rev, int *threshold)
  59 {
  60         int sku = sku_info->sku_id;
  61
  62         /* Assign to default */
  63         sku_info->cpu_speedo_id = 0;
  64         sku_info->soc_speedo_id = 0;
  65         sku_info->gpu_speedo_id = 0;
  66         *threshold = THRESHOLD_INDEX_0;
  67
  68         switch (sku) {
  69         case 0x00: /* Engineering SKU */
  70         case 0x01: /* Engineering SKU */
  71         case 0x07:
  72         case 0x17:
  73         case 0x27:
  74                 if (speedo_rev >= 2)
  75                         sku_info->gpu_speedo_id = 1;
  76                 break;
  77
  78         case 0x13:
  79                 if (speedo_rev >= 2)
  80                         sku_info->gpu_speedo_id = 1;
  81
  82                 sku_info->cpu_speedo_id = 1;
  83                 break;
  84
  85         default:
  86                 pr_err("Tegra210: unknown SKU %#04x\n", sku);
  87                 /* Using the default for the error case */
  88                 break;
  89         }
  90 }
  91
  92 static int get_process_id(int value, const u32 *speedos, unsigned int num)
  93 {
  94         unsigned int i;
  95
  96         for (i = 0; i < num; i++)
  97                 if (value < speedos[num])
  98                         return i;
  99
 100         return -EINVAL;
 101 }
 102
 103 void __init tegra210_init_speedo_data(struct tegra_sku_info *sku_info)
 104 {
 105         int cpu_speedo[3], soc_speedo[3], cpu_iddq, gpu_iddq, soc_iddq;
 106         unsigned int index;
 107         u8 speedo_revision;
 108
 109         BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
 110                         THRESHOLD_INDEX_COUNT);
 111         BUILD_BUG_ON(ARRAY_SIZE(gpu_process_speedos) !=
 112                         THRESHOLD_INDEX_COUNT);
 113         BUILD_BUG_ON(ARRAY_SIZE(soc_process_speedos) !=
 114                         THRESHOLD_INDEX_COUNT);
 115
 116         /* Read speedo/IDDQ fuses */
 117         cpu_speedo[0] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_0);
 118         cpu_speedo[1] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_1);
 119         cpu_speedo[2] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_2);
 120
 121         soc_speedo[0] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_0);
 122         soc_speedo[1] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_1);
 123         soc_speedo[2] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_2);
 124
 125         cpu_iddq = tegra_fuse_read_early(FUSE_CPU_IDDQ) * 4;
 126         soc_iddq = tegra_fuse_read_early(FUSE_SOC_IDDQ) * 4;
 127         gpu_iddq = tegra_fuse_read_early(FUSE_GPU_IDDQ) * 5;
 128
 129         /*
 130          * Determine CPU, GPU and SoC speedo values depending on speedo fusing
 131          * revision. Note that GPU speedo value is fused in CPU_SPEEDO_2.
 132          */
 133         speedo_revision = get_speedo_revision();
 134         pr_info("Speedo Revision %u\n", speedo_revision);
 135
 136         if (speedo_revision >= 3) {
 137                 sku_info->cpu_speedo_value = cpu_speedo[0];
 138                 sku_info->gpu_speedo_value = cpu_speedo[2];
 139                 sku_info->soc_speedo_value = soc_speedo[0];
 140         } else if (speedo_revision == 2) {
 141                 sku_info->cpu_speedo_value = (-1938 + (1095 * cpu_speedo[0] / 100)) / 10;
 142                 sku_info->gpu_speedo_value = (-1662 + (1082 * cpu_speedo[2] / 100)) / 10;
 143                 sku_info->soc_speedo_value = ( -705 + (1037 * soc_speedo[0] / 100)) / 10;
 144         } else {
 145                 sku_info->cpu_speedo_value = 2100;
 146                 sku_info->gpu_speedo_value = cpu_speedo[2] - 75;
 147                 sku_info->soc_speedo_value = 1900;
 148         }
 149
 150         if ((sku_info->cpu_speedo_value <= 0) ||
 151             (sku_info->gpu_speedo_value <= 0) ||
 152             (sku_info->soc_speedo_value <= 0)) {
 153                 WARN(1, "speedo value not fused\n");
 154                 return;
 155         }
 156
 157         rev_sku_to_speedo_ids(sku_info, speedo_revision, &index);
 158
 159         sku_info->gpu_process_id = get_process_id(sku_info->gpu_speedo_value,
 160                                                   gpu_process_speedos[index],
 161                                                   GPU_PROCESS_CORNERS);
 162
 163         sku_info->cpu_process_id = get_process_id(sku_info->cpu_speedo_value,
 164                                                   cpu_process_speedos[index],
 165                                                   CPU_PROCESS_CORNERS);
 166
 167         sku_info->soc_process_id = get_process_id(sku_info->soc_speedo_value,
 168                                                   soc_process_speedos[index],
 169                                                   SOC_PROCESS_CORNERS);
 170
 171         pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",
 172                  sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);
 173 }