Quelle  speedo-tegra114.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013-2014, NVIDIA CORPORATION.  All rights reserved.
 */

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

#include <soc/tegra/fuse.h>

#include "fuse.h"

#define SOC_PROCESS_CORNERS 2
#define CPU_PROCESS_CORNERS 2

enum {
 THRESHOLD_INDEX_0,
 THRESHOLD_INDEX_1,
 THRESHOLD_INDEX_COUNT,
};

static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {
 {1123,     UINT_MAX},
 {0,        UINT_MAX},
};

static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
 {1695,     UINT_MAX},
 {0,        UINT_MAX},
};

static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
      int *threshold)
{
 u32 tmp;
 u32 sku = sku_info->sku_id;
 enum tegra_revision rev = sku_info->revision;

 switch (sku) {
 case 0x00:
 case 0x10:
 case 0x05:
 case 0x06:
  sku_info->cpu_speedo_id = 1;
  sku_info->soc_speedo_id = 0;
  *threshold = THRESHOLD_INDEX_0;
  break;

 case 0x03:
 case 0x04:
  sku_info->cpu_speedo_id = 2;
  sku_info->soc_speedo_id = 1;
  *threshold = THRESHOLD_INDEX_1;
  break;

 default:
  pr_err("Tegra Unknown SKU %d\n", sku);
  sku_info->cpu_speedo_id = 0;
  sku_info->soc_speedo_id = 0;
  *threshold = THRESHOLD_INDEX_0;
  break;
 }

 if (rev == TEGRA_REVISION_A01) {
  tmp = tegra_fuse_read_early(0x270) << 1;
  tmp |= tegra_fuse_read_early(0x26c);
  if (!tmp)
   sku_info->cpu_speedo_id = 0;
 }
}

void __init tegra114_init_speedo_data(struct tegra_sku_info *sku_info)
{
 u32 cpu_speedo_val;
 u32 soc_speedo_val;
 int threshold;
 int i;

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

 rev_sku_to_speedo_ids(sku_info, &threshold);

 cpu_speedo_val = tegra_fuse_read_early(0x12c) + 1024;
 soc_speedo_val = tegra_fuse_read_early(0x134);

 for (i = 0; i < CPU_PROCESS_CORNERS; i++)
  if (cpu_speedo_val < cpu_process_speedos[threshold][i])
   break;
 sku_info->cpu_process_id = i;

 for (i = 0; i < SOC_PROCESS_CORNERS; i++)
  if (soc_speedo_val < soc_process_speedos[threshold][i])
   break;
 sku_info->soc_process_id = i;
}