arch/arm/mach-omap2/prm2xxx.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/prm2xxx.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/prm2xxx.c
Extension
.c
Size
6164 bytes
Lines
230
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
/*
 * OMAP2xxx PRM module functions
 *
 * Copyright (C) 2010-2012 Texas Instruments, Inc.
 * Copyright (C) 2010 Nokia Corporation
 * Benoît Cousson
 * Paul Walmsley
 * Rajendra Nayak <rnayak@ti.com>
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>

#include "powerdomain.h"
#include "clockdomain.h"
#include "prm2xxx.h"
#include "cm2xxx_3xxx.h"
#include "prm-regbits-24xx.h"

/*
 * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
 * these are reversed from the bits used on OMAP3+
 */
#define OMAP24XX_PWRDM_POWER_ON			0x0
#define OMAP24XX_PWRDM_POWER_RET		0x1
#define OMAP24XX_PWRDM_POWER_OFF		0x3

/*
 * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
 *   hardware register (which are specific to the OMAP2xxx SoCs) to
 *   reset source ID bit shifts (which is an OMAP SoC-independent
 *   enumeration)
 */
static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
	{ OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
	{ OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
	{ OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
	{ OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
	{ OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
	{ OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
	{ -1, -1 },
};

/**
 * omap2xxx_prm_read_reset_sources - return the last SoC reset source
 *
 * Return a u32 representing the last reset sources of the SoC.  The
 * returned reset source bits are standardized across OMAP SoCs.
 */
static u32 omap2xxx_prm_read_reset_sources(void)
{
	struct prm_reset_src_map *p;
	u32 r = 0;
	u32 v;

	v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);

	p = omap2xxx_prm_reset_src_map;
	while (p->reg_shift >= 0 && p->std_shift >= 0) {
		if (v & (1 << p->reg_shift))
			r |= 1 << p->std_shift;
		p++;
	}

	return r;
}

/**
 * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
 * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
 *
 * Return the common power state bits corresponding to the OMAP2xxx
 * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
 */
static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
{
	u8 pwrst;

	switch (omap2xxx_pwrst) {
	case OMAP24XX_PWRDM_POWER_OFF:
		pwrst = PWRDM_POWER_OFF;
		break;
	case OMAP24XX_PWRDM_POWER_RET:
		pwrst = PWRDM_POWER_RET;
		break;
	case OMAP24XX_PWRDM_POWER_ON:

Annotation

Implementation Notes