arch/arm/mach-zynq/common.c

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

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-zynq/common.c
Extension
.c
Size
4632 bytes
Lines
201
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
/*
 * This file contains common code that is intended to be used across
 * boards so that it's not replicated.
 *
 *  Copyright (C) 2011 Xilinx
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/cpumask.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/clk/zynq.h>
#include <linux/clocksource.h>
#include <linux/of_address.h>
#include <linux/of_clk.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <linux/memblock.h>
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/pgtable.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <asm/mach-types.h>
#include <asm/page.h>
#include <asm/smp_scu.h>
#include <asm/system_info.h>
#include <asm/hardware/cache-l2x0.h>

#include "common.h"

#define ZYNQ_DEVCFG_MCTRL		0x80
#define ZYNQ_DEVCFG_PS_VERSION_SHIFT	28
#define ZYNQ_DEVCFG_PS_VERSION_MASK	0xF

void __iomem *zynq_scu_base;

/**
 * zynq_memory_init - Initialize special memory
 *
 * We need to stop things allocating the low memory as DMA can't work in
 * the 1st 512K of memory.
 */
static void __init zynq_memory_init(void)
{
	if (!__pa(PAGE_OFFSET))
		memblock_reserve(__pa(PAGE_OFFSET), 0x80000);
}

static struct platform_device zynq_cpuidle_device = {
	.name = "cpuidle-zynq",
};

/**
 * zynq_get_revision - Get Zynq silicon revision
 *
 * Return: Silicon version or -1 otherwise
 */
static int __init zynq_get_revision(void)
{
	struct device_node *np;
	void __iomem *zynq_devcfg_base;
	u32 revision;

	np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-devcfg-1.0");
	if (!np) {
		pr_err("%s: no devcfg node found\n", __func__);
		return -1;
	}

	zynq_devcfg_base = of_iomap(np, 0);
	of_node_put(np);
	if (!zynq_devcfg_base) {
		pr_err("%s: Unable to map I/O memory\n", __func__);
		return -1;
	}

	revision = readl(zynq_devcfg_base + ZYNQ_DEVCFG_MCTRL);
	revision >>= ZYNQ_DEVCFG_PS_VERSION_SHIFT;
	revision &= ZYNQ_DEVCFG_PS_VERSION_MASK;

	iounmap(zynq_devcfg_base);

Annotation

Implementation Notes