drivers/soc/tegra/fuse/speedo-tegra20.c

Source file repositories/reference/linux-study-clean/drivers/soc/tegra/fuse/speedo-tegra20.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/tegra/fuse/speedo-tegra20.c
Extension
.c
Size
2591 bytes
Lines
100
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2012-2014, 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 CPU_SPEEDO_LSBIT		20
#define CPU_SPEEDO_MSBIT		29
#define CPU_SPEEDO_REDUND_LSBIT		30
#define CPU_SPEEDO_REDUND_MSBIT		39
#define CPU_SPEEDO_REDUND_OFFS	(CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)

#define SOC_SPEEDO_LSBIT		40
#define SOC_SPEEDO_MSBIT		47
#define SOC_SPEEDO_REDUND_LSBIT		48
#define SOC_SPEEDO_REDUND_MSBIT		55
#define SOC_SPEEDO_REDUND_OFFS	(SOC_SPEEDO_REDUND_MSBIT - SOC_SPEEDO_MSBIT)

#define SPEEDO_MULT			4

#define PROCESS_CORNERS_NUM		4

#define SPEEDO_ID_SELECT_0(rev)		((rev) <= 2)
#define SPEEDO_ID_SELECT_1(sku)		\
	(((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
	 ((sku) != 27) && ((sku) != 28))

enum {
	SPEEDO_ID_0,
	SPEEDO_ID_1,
	SPEEDO_ID_2,
	SPEEDO_ID_COUNT,
};

static const u32 __initconst cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
	{315, 366, 420, UINT_MAX},
	{303, 368, 419, UINT_MAX},
	{316, 331, 383, UINT_MAX},
};

static const u32 __initconst soc_process_speedos[][PROCESS_CORNERS_NUM] = {
	{165, 195, 224, UINT_MAX},
	{165, 195, 224, UINT_MAX},
	{165, 195, 224, UINT_MAX},
};

void __init tegra20_init_speedo_data(struct tegra_sku_info *sku_info)
{
	u32 reg;
	u32 val;
	int i;

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

	if (SPEEDO_ID_SELECT_0(sku_info->revision))
		sku_info->soc_speedo_id = SPEEDO_ID_0;
	else if (SPEEDO_ID_SELECT_1(sku_info->sku_id))
		sku_info->soc_speedo_id = SPEEDO_ID_1;
	else
		sku_info->soc_speedo_id = SPEEDO_ID_2;

	val = 0;
	for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
		reg = tegra_fuse_read_spare(i) |
			tegra_fuse_read_spare(i + CPU_SPEEDO_REDUND_OFFS);
		val = (val << 1) | (reg & 0x1);
	}
	val = val * SPEEDO_MULT;
	pr_debug("Tegra CPU speedo value %u\n", val);

	for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
		if (val <= cpu_process_speedos[sku_info->soc_speedo_id][i])
			break;
	}
	sku_info->cpu_process_id = i;

	val = 0;
	for (i = SOC_SPEEDO_MSBIT; i >= SOC_SPEEDO_LSBIT; i--) {
		reg = tegra_fuse_read_spare(i) |
			tegra_fuse_read_spare(i + SOC_SPEEDO_REDUND_OFFS);
		val = (val << 1) | (reg & 0x1);
	}

Annotation

Implementation Notes