Quelle  speedo-tegra210.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013-2015, NVIDIA CORPORATION.  All rights reserved.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/bug.h>

#include <soc/tegra/fuse.h>

#include "fuse.h"

#define CPU_PROCESS_CORNERS 2
#define GPU_PROCESS_CORNERS 2
#define SOC_PROCESS_CORNERS 3

#define FUSE_CPU_SPEEDO_0 0x014
#define FUSE_CPU_SPEEDO_1 0x02c
#define FUSE_CPU_SPEEDO_2 0x030
#define FUSE_SOC_SPEEDO_0 0x034
#define FUSE_SOC_SPEEDO_1 0x038
#define FUSE_SOC_SPEEDO_2 0x03c
#define FUSE_CPU_IDDQ  0x018
#define FUSE_SOC_IDDQ  0x040
#define FUSE_GPU_IDDQ  0x128
#define FUSE_FT_REV  0x028

enum {
 THRESHOLD_INDEX_0,
 THRESHOLD_INDEX_1,
 THRESHOLD_INDEX_COUNT,
};

static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
 { 2119, UINT_MAX },
 { 2119, UINT_MAX },
};

static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {
 { UINT_MAX, UINT_MAX },
 { UINT_MAX, UINT_MAX },
};

static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {
 { 1950, 2100, UINT_MAX },
 { 1950, 2100, UINT_MAX },
};

static u8 __init get_speedo_revision(void)
{
 return tegra_fuse_read_spare(4) << 2 |
        tegra_fuse_read_spare(3) << 1 |
        tegra_fuse_read_spare(2) << 0;
}

static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
      u8 speedo_rev, int *threshold)
{
 int sku = sku_info->sku_id;

 /* Assign to default */
 sku_info->cpu_speedo_id = 0;
 sku_info->soc_speedo_id = 0;
 sku_info->gpu_speedo_id = 0;
 *threshold = THRESHOLD_INDEX_0;

 switch (sku) {
 case 0x00: /* Engineering SKU */
 case 0x01: /* Engineering SKU */
 case 0x07:
 case 0x17:
 case 0x27:
  if (speedo_rev >= 2)
   sku_info->gpu_speedo_id = 1;
  break;

 case 0x13:
  if (speedo_rev >= 2)
   sku_info->gpu_speedo_id = 1;

  sku_info->cpu_speedo_id = 1;
  break;

 default:
  pr_err("Tegra210: unknown SKU %#04x\n", sku);
  /* Using the default for the error case */
  break;
 }
}

static int get_process_id(int value, const u32 *speedos, unsigned int num)
{
 unsigned int i;

 for (i = 0; i < num; i++)
  if (value < speedos[i])
   return i;

 return -EINVAL;
}

void __init tegra210_init_speedo_data(struct tegra_sku_info *sku_info)
{
 int cpu_speedo[3], soc_speedo[3];
 unsigned int index;
 u8 speedo_revision;

 BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
   THRESHOLD_INDEX_COUNT);
 BUILD_BUG_ON(ARRAY_SIZE(gpu_process_speedos) !=
   THRESHOLD_INDEX_COUNT);
 BUILD_BUG_ON(ARRAY_SIZE(soc_process_speedos) !=
   THRESHOLD_INDEX_COUNT);

 /* Read speedo/IDDQ fuses */
 cpu_speedo[0] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_0);
 cpu_speedo[1] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_1);
 cpu_speedo[2] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_2);

 soc_speedo[0] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_0);
 soc_speedo[1] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_1);
 soc_speedo[2] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_2);

 /*
 * Determine CPU, GPU and SoC speedo values depending on speedo fusing
 * revision. Note that GPU speedo value is fused in CPU_SPEEDO_2.
 */
 speedo_revision = get_speedo_revision();
 pr_info("Speedo Revision %u\n", speedo_revision);

 if (speedo_revision >= 3) {
  sku_info->cpu_speedo_value = cpu_speedo[0];
  sku_info->gpu_speedo_value = cpu_speedo[2];
  sku_info->soc_speedo_value = soc_speedo[0];
 } else if (speedo_revision == 2) {
  sku_info->cpu_speedo_value = (-1938 + (1095 * cpu_speedo[0] / 100)) / 10;
  sku_info->gpu_speedo_value = (-1662 + (1082 * cpu_speedo[2] / 100)) / 10;
  sku_info->soc_speedo_value = ( -705 + (1037 * soc_speedo[0] / 100)) / 10;
 } else {
  sku_info->cpu_speedo_value = 2100;
  sku_info->gpu_speedo_value = cpu_speedo[2] - 75;
  sku_info->soc_speedo_value = 1900;
 }

 if ((sku_info->cpu_speedo_value <= 0) ||
     (sku_info->gpu_speedo_value <= 0) ||
     (sku_info->soc_speedo_value <= 0)) {
  WARN(1, "speedo value not fused\n");
  return;
 }

 rev_sku_to_speedo_ids(sku_info, speedo_revision, &index);

 sku_info->gpu_process_id = get_process_id(sku_info->gpu_speedo_value,
        gpu_process_speedos[index],
        GPU_PROCESS_CORNERS);

 sku_info->cpu_process_id = get_process_id(sku_info->cpu_speedo_value,
        cpu_process_speedos[index],
        CPU_PROCESS_CORNERS);

 sku_info->soc_process_id = get_process_id(sku_info->soc_speedo_value,
        soc_process_speedos[index],
        SOC_PROCESS_CORNERS);

 pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",
   sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);
}