arch/powerpc/platforms/83xx/misc.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/83xx/misc.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/83xx/misc.c
Extension
.c
Size
3212 bytes
Lines
152
Domain
Architecture Layer
Bucket
arch/powerpc
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
/*
 * misc setup functions for MPC83xx
 *
 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/of_platform.h>
#include <linux/pci.h>

#include <asm/debug.h>
#include <asm/io.h>
#include <asm/hw_irq.h>
#include <asm/ipic.h>
#include <asm/fixmap.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>

#include <mm/mmu_decl.h>

#include "mpc83xx.h"

static __be32 __iomem *restart_reg_base;

static int __init mpc83xx_restart_init(void)
{
	/* map reset restart_reg_baseister space */
	restart_reg_base = ioremap(get_immrbase() + 0x900, 0xff);

	return 0;
}

arch_initcall(mpc83xx_restart_init);

void __noreturn mpc83xx_restart(char *cmd)
{
#define RST_OFFSET	0x00000900
#define RST_PROT_REG	0x00000018
#define RST_CTRL_REG	0x0000001c

	local_irq_disable();

	if (restart_reg_base) {
		/* enable software reset "RSTE" */
		out_be32(restart_reg_base + (RST_PROT_REG >> 2), 0x52535445);

		/* set software hard reset */
		out_be32(restart_reg_base + (RST_CTRL_REG >> 2), 0x2);
	} else {
		printk (KERN_EMERG "Error: Restart registers not mapped, spinning!\n");
	}

	for (;;) ;
}

long __init mpc83xx_time_init(void)
{
#define SPCR_OFFSET	0x00000110
#define SPCR_TBEN	0x00400000
	__be32 __iomem *spcr = ioremap(get_immrbase() + SPCR_OFFSET, 4);
	__be32 tmp;

	tmp = in_be32(spcr);
	out_be32(spcr, tmp | SPCR_TBEN);

	iounmap(spcr);

	return 0;
}

void __init mpc83xx_ipic_init_IRQ(void)
{
	struct device_node *np;

	/* looking for fsl,pq2pro-pic which is asl compatible with fsl,ipic */
	np = of_find_compatible_node(NULL, NULL, "fsl,ipic");
	if (!np)
		np = of_find_node_by_type(NULL, "ipic");
	if (!np)
		return;

	ipic_init(np, 0);

	of_node_put(np);

	/* Initialize the default interrupt mapping priorities,
	 * in case the boot rom changed something on us.

Annotation

Implementation Notes