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/*
* Copyright (c) 2013-2015, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#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], cpu_iddq, gpu_iddq, soc_iddq;
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_CPU_SPEEDO_2);
cpu_iddq = tegra_fuse_read_early(FUSE_CPU_IDDQ) * 4;
soc_iddq = tegra_fuse_read_early(FUSE_SOC_IDDQ) * 4;
gpu_iddq = tegra_fuse_read_early(FUSE_GPU_IDDQ) * 5;
/*
* 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);
}
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