arch/arm/mach-omap2/omap_twl.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/omap_twl.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/omap_twl.c
Extension
.c
Size
6852 bytes
Lines
248
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP and TWL PMIC specific initializations.
 *
 * Copyright (C) 2010 Texas Instruments Incorporated.
 * Thara Gopinath
 * Copyright (C) 2009 Texas Instruments Incorporated.
 * Nishanth Menon
 * Copyright (C) 2009 Nokia Corporation
 * Paul Walmsley
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/twl.h>

#include "soc.h"
#include "voltage.h"

#include "pm.h"

#define OMAP3_SRI2C_SLAVE_ADDR		0x12
#define OMAP3_VDD_MPU_SR_CONTROL_REG	0x00
#define OMAP3_VDD_CORE_SR_CONTROL_REG	0x01
#define OMAP3_VP_CONFIG_ERROROFFSET	0x00
#define OMAP3_VP_VSTEPMIN_VSTEPMIN	0x1
#define OMAP3_VP_VSTEPMAX_VSTEPMAX	0x04
#define OMAP3_VP_VLIMITTO_TIMEOUT_US	200

#define OMAP4_SRI2C_SLAVE_ADDR		0x12
#define OMAP4_VDD_MPU_SR_VOLT_REG	0x55
#define OMAP4_VDD_MPU_SR_CMD_REG	0x56
#define OMAP4_VDD_IVA_SR_VOLT_REG	0x5B
#define OMAP4_VDD_IVA_SR_CMD_REG	0x5C
#define OMAP4_VDD_CORE_SR_VOLT_REG	0x61
#define OMAP4_VDD_CORE_SR_CMD_REG	0x62

static bool is_offset_valid;
static u8 smps_offset;

#define REG_SMPS_OFFSET         0xE0

static unsigned long twl4030_vsel_to_uv(const u8 vsel)
{
	return (((vsel * 125) + 6000)) * 100;
}

static u8 twl4030_uv_to_vsel(unsigned long uv)
{
	return DIV_ROUND_UP(uv - 600000, 12500);
}

static unsigned long twl6030_vsel_to_uv(const u8 vsel)
{
	/*
	 * In TWL6030 depending on the value of SMPS_OFFSET
	 * efuse register the voltage range supported in
	 * standard mode can be either between 0.6V - 1.3V or
	 * 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
	 * is programmed to all 0's where as starting from
	 * TWL6030 ES1.1 the efuse is programmed to 1
	 */
	if (!is_offset_valid) {
		twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
				REG_SMPS_OFFSET);
		is_offset_valid = true;
	}

	if (!vsel)
		return 0;
	/*
	 * There is no specific formula for voltage to vsel
	 * conversion above 1.3V. There are special hardcoded
	 * values for voltages above 1.3V. Currently we are
	 * hardcoding only for 1.35 V which is used for 1GH OPP for
	 * OMAP4430.
	 */
	if (vsel == 0x3A)
		return 1350000;

	if (smps_offset & 0x8)
		return ((((vsel - 1) * 1266) + 70900)) * 10;
	else
		return ((((vsel - 1) * 1266) + 60770)) * 10;
}

static u8 twl6030_uv_to_vsel(unsigned long uv)
{
	/*

Annotation

Implementation Notes