170 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*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 215#define GPU_PROCESS_CORNERS 216#define SOC_PROCESS_CORNERS 317 18#define FUSE_CPU_SPEEDO_0 0x01419#define FUSE_CPU_SPEEDO_1 0x02c20#define FUSE_CPU_SPEEDO_2 0x03021#define FUSE_SOC_SPEEDO_0 0x03422#define FUSE_SOC_SPEEDO_1 0x03823#define FUSE_SOC_SPEEDO_2 0x03c24#define FUSE_CPU_IDDQ 0x01825#define FUSE_SOC_IDDQ 0x04026#define FUSE_GPU_IDDQ 0x12827#define FUSE_FT_REV 0x02828 29enum {30 THRESHOLD_INDEX_0,31 THRESHOLD_INDEX_1,32 THRESHOLD_INDEX_COUNT,33};34 35static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {36 { 2119, UINT_MAX },37 { 2119, UINT_MAX },38};39 40static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {41 { UINT_MAX, UINT_MAX },42 { UINT_MAX, UINT_MAX },43};44 45static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {46 { 1950, 2100, UINT_MAX },47 { 1950, 2100, UINT_MAX },48};49 50static 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 57static 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 92static 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[i])98 return i;99 100 return -EINVAL;101}102 103void __init tegra210_init_speedo_data(struct tegra_sku_info *sku_info)104{105 int cpu_speedo[3], soc_speedo[3];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 /*126 * Determine CPU, GPU and SoC speedo values depending on speedo fusing127 * revision. Note that GPU speedo value is fused in CPU_SPEEDO_2.128 */129 speedo_revision = get_speedo_revision();130 pr_info("Speedo Revision %u\n", speedo_revision);131 132 if (speedo_revision >= 3) {133 sku_info->cpu_speedo_value = cpu_speedo[0];134 sku_info->gpu_speedo_value = cpu_speedo[2];135 sku_info->soc_speedo_value = soc_speedo[0];136 } else if (speedo_revision == 2) {137 sku_info->cpu_speedo_value = (-1938 + (1095 * cpu_speedo[0] / 100)) / 10;138 sku_info->gpu_speedo_value = (-1662 + (1082 * cpu_speedo[2] / 100)) / 10;139 sku_info->soc_speedo_value = ( -705 + (1037 * soc_speedo[0] / 100)) / 10;140 } else {141 sku_info->cpu_speedo_value = 2100;142 sku_info->gpu_speedo_value = cpu_speedo[2] - 75;143 sku_info->soc_speedo_value = 1900;144 }145 146 if ((sku_info->cpu_speedo_value <= 0) ||147 (sku_info->gpu_speedo_value <= 0) ||148 (sku_info->soc_speedo_value <= 0)) {149 WARN(1, "speedo value not fused\n");150 return;151 }152 153 rev_sku_to_speedo_ids(sku_info, speedo_revision, &index);154 155 sku_info->gpu_process_id = get_process_id(sku_info->gpu_speedo_value,156 gpu_process_speedos[index],157 GPU_PROCESS_CORNERS);158 159 sku_info->cpu_process_id = get_process_id(sku_info->cpu_speedo_value,160 cpu_process_speedos[index],161 CPU_PROCESS_CORNERS);162 163 sku_info->soc_process_id = get_process_id(sku_info->soc_speedo_value,164 soc_process_speedos[index],165 SOC_PROCESS_CORNERS);166 167 pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",168 sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);169}170