arch/arm/mach-imx/mm-imx3.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-imx/mm-imx3.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-imx/mm-imx3.c
Extension
.c
Size
3852 bytes
Lines
151
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-or-later
/*
 *  Copyright (C) 1999,2000 Arm Limited
 *  Copyright (C) 2000 Deep Blue Solutions Ltd
 *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
 *  Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 *    - add MX31 specific definitions
 */

#include <linux/mm.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of_address.h>

#include <asm/system_misc.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/map.h>

#include "common.h"
#include "crmregs-imx3.h"
#include "hardware.h"

void __iomem *mx3_ccm_base;

static void imx3_idle(void)
{
	unsigned long reg = 0;

	__asm__ __volatile__(
		/* disable I and D cache */
		"mrc p15, 0, %0, c1, c0, 0\n"
		"bic %0, %0, #0x00001000\n"
		"bic %0, %0, #0x00000004\n"
		"mcr p15, 0, %0, c1, c0, 0\n"
		/* invalidate I cache */
		"mov %0, #0\n"
		"mcr p15, 0, %0, c7, c5, 0\n"
		/* clear and invalidate D cache */
		"mov %0, #0\n"
		"mcr p15, 0, %0, c7, c14, 0\n"
		/* WFI */
		"mov %0, #0\n"
		"mcr p15, 0, %0, c7, c0, 4\n"
		"nop\n" "nop\n" "nop\n" "nop\n"
		"nop\n" "nop\n" "nop\n"
		/* enable I and D cache */
		"mrc p15, 0, %0, c1, c0, 0\n"
		"orr %0, %0, #0x00001000\n"
		"orr %0, %0, #0x00000004\n"
		"mcr p15, 0, %0, c1, c0, 0\n"
		: "=r" (reg));
}

static void __iomem *imx3_ioremap_caller(phys_addr_t phys_addr, size_t size,
					 unsigned int mtype, void *caller)
{
	if (mtype == MT_DEVICE) {
		/*
		 * Access all peripherals below 0x80000000 as nonshared device
		 * on mx3, but leave l2cc alone.  Otherwise cache corruptions
		 * can occur.
		 */
		if (phys_addr < 0x80000000 &&
				!addr_in_module(phys_addr, MX3x_L2CC))
			mtype = MT_DEVICE_NONSHARED;
	}

	return __arm_ioremap_caller(phys_addr, size, mtype, caller);
}

#ifdef CONFIG_SOC_IMX31
static struct map_desc mx31_io_desc[] __initdata = {
	imx_map_entry(MX31, X_MEMC, MT_DEVICE),
	imx_map_entry(MX31, AVIC, MT_DEVICE_NONSHARED),
	imx_map_entry(MX31, AIPS1, MT_DEVICE_NONSHARED),
	imx_map_entry(MX31, AIPS2, MT_DEVICE_NONSHARED),
	imx_map_entry(MX31, SPBA0, MT_DEVICE_NONSHARED),
};

/*
 * This function initializes the memory map. It is called during the
 * system startup to create static physical to virtual memory mappings
 * for the IO modules.
 */
void __init mx31_map_io(void)
{
	iotable_init(mx31_io_desc, ARRAY_SIZE(mx31_io_desc));
}

Annotation

Implementation Notes