arch/arm/mach-keystone/keystone.c

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

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-keystone/keystone.c
Extension
.c
Size
3567 bytes
Lines
149
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
/*
 * Keystone2 based boards and SOC related code.
 *
 * Copyright 2013 Texas Instruments, Inc.
 *	Cyril Chemparathy <cyril@ti.com>
 *	Santosh Shilimkar <santosh.shillimkar@ti.com>
 */

#include <linux/io.h>
#include <linux/dma-map-ops.h>
#include <linux/init.h>
#include <linux/pm_runtime.h>
#include <linux/pm_clock.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include <asm/setup.h>
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/page.h>

#define KEYSTONE_LOW_PHYS_START		0x80000000ULL
#define KEYSTONE_LOW_PHYS_SIZE		0x80000000ULL /* 2G */
#define KEYSTONE_LOW_PHYS_END		(KEYSTONE_LOW_PHYS_START + \
					 KEYSTONE_LOW_PHYS_SIZE - 1)

#define KEYSTONE_HIGH_PHYS_START	0x800000000ULL
#define KEYSTONE_HIGH_PHYS_SIZE		0x400000000ULL	/* 16G */
#define KEYSTONE_HIGH_PHYS_END		(KEYSTONE_HIGH_PHYS_START + \
					 KEYSTONE_HIGH_PHYS_SIZE - 1)

static struct dev_pm_domain keystone_pm_domain = {
	.ops = {
		USE_PM_CLK_RUNTIME_OPS
		USE_PLATFORM_PM_SLEEP_OPS
	},
};

static struct pm_clk_notifier_block platform_domain_notifier = {
	.pm_domain = &keystone_pm_domain,
	.con_ids = { NULL },
};

static const struct of_device_id of_keystone_table[] = {
	{.compatible = "ti,k2hk"},
	{.compatible = "ti,k2e"},
	{.compatible = "ti,k2l"},
	{ /* end of list */ },
};

static int __init keystone_pm_runtime_init(void)
{
	struct device_node *np;

	np = of_find_matching_node(NULL, of_keystone_table);
	if (!np)
		return 0;

	pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);

	return 0;
}

#ifdef CONFIG_ARM_LPAE
static int keystone_platform_notifier(struct notifier_block *nb,
				      unsigned long event, void *data)
{
	struct device *dev = data;

	if (event != BUS_NOTIFY_ADD_DEVICE)
		return NOTIFY_DONE;

	if (!dev)
		return NOTIFY_BAD;

	if (!dev->of_node) {
		int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START,
						KEYSTONE_LOW_PHYS_START,
						KEYSTONE_HIGH_PHYS_SIZE);
		dev_err(dev, "set dma_offset%08llx%s\n",
			KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START,
			ret ? " failed" : "");
	}
	return NOTIFY_OK;
}

static struct notifier_block platform_nb = {

Annotation

Implementation Notes