arch/powerpc/platforms/44x/canyonlands.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/44x/canyonlands.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/44x/canyonlands.c
Extension
.c
Size
2749 bytes
Lines
118
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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
/*
 * This contain platform specific code for APM PPC460EX based Canyonlands
 * board.
 *
 * Copyright (c) 2010, Applied Micro Circuits Corporation
 * Author: Rupjyoti Sarmah <rsarmah@apm.com>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/pci-bridge.h>
#include <asm/ppc4xx.h>
#include <asm/udbg.h>
#include <asm/uic.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/delay.h>
#include "44x.h"

#define BCSR_USB_EN	0x11

static const struct of_device_id ppc460ex_of_bus[] __initconst = {
	{ .compatible = "ibm,plb4", },
	{ .compatible = "ibm,opb", },
	{ .compatible = "ibm,ebc", },
	{ .compatible = "simple-bus", },
	{},
};

static int __init ppc460ex_device_probe(void)
{
	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);

	return 0;
}
machine_device_initcall(canyonlands, ppc460ex_device_probe);

/* Using this code only for the Canyonlands board.  */

static int __init ppc460ex_probe(void)
{
	pci_set_flags(PCI_REASSIGN_ALL_RSRC);

	return 1;
}

/* USB PHY fixup code on Canyonlands kit. */

static int __init ppc460ex_canyonlands_fixup(void)
{
	u8 __iomem *bcsr ;
	void __iomem *vaddr;
	struct device_node *np;
	int ret = 0;

	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
	if (!np) {
		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
		return -ENODEV;
	}

	bcsr = of_iomap(np, 0);
	of_node_put(np);

	if (!bcsr) {
		printk(KERN_CRIT "Could not remap bcsr\n");
		ret = -ENODEV;
		goto err_bcsr;
	}

	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
	if (!np) {
		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
		return -ENODEV;
	}

	vaddr = of_iomap(np, 0);
	of_node_put(np);

	if (!vaddr) {
		printk(KERN_CRIT "Could not get gpio node address\n");
		ret = -ENODEV;
		goto err_gpio;
	}
	/* Disable USB, through the BCSR7 bits */
	setbits8(&bcsr[7], BCSR_USB_EN);

	/* Wait for a while after reset */
	msleep(100);

Annotation

Implementation Notes