arch/powerpc/platforms/embedded6xx/wii.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/embedded6xx/wii.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/embedded6xx/wii.c
Extension
.c
Size
3880 bytes
Lines
181
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
/*
 * arch/powerpc/platforms/embedded6xx/wii.c
 *
 * Nintendo Wii board-specific support
 * Copyright (C) 2008-2009 The GameCube Linux Team
 * Copyright (C) 2008,2009 Albert Herranz
 */
#define DRV_MODULE_NAME "wii"
#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>

#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/udbg.h>

#include "flipper-pic.h"
#include "hlwd-pic.h"
#include "usbgecko_udbg.h"

/* control block */
#define HW_CTRL_COMPATIBLE	"nintendo,hollywood-control"

#define HW_CTRL_RESETS		0x94
#define HW_CTRL_RESETS_SYS	(1<<0)

/* gpio */
#define HW_GPIO_COMPATIBLE	"nintendo,hollywood-gpio"

#define HW_GPIO_BASE(idx)	(idx * 0x20)
#define HW_GPIO_OUT(idx)	(HW_GPIO_BASE(idx) + 0)
#define HW_GPIO_DIR(idx)	(HW_GPIO_BASE(idx) + 4)
#define HW_GPIO_OWNER		(HW_GPIO_BASE(1) + 0x1c)

#define HW_GPIO_SHUTDOWN	(1<<1)
#define HW_GPIO_SLOT_LED	(1<<5)
#define HW_GPIO_SENSOR_BAR	(1<<8)


static void __iomem *hw_ctrl;
static void __iomem *hw_gpio;

static void __noreturn wii_spin(void)
{
	local_irq_disable();
	for (;;)
		cpu_relax();
}

static void __iomem *__init wii_ioremap_hw_regs(char *name, char *compatible)
{
	void __iomem *hw_regs = NULL;
	struct device_node *np;
	struct resource res;
	int error = -ENODEV;

	np = of_find_compatible_node(NULL, NULL, compatible);
	if (!np) {
		pr_err("no compatible node found for %s\n", compatible);
		goto out;
	}
	error = of_address_to_resource(np, 0, &res);
	if (error) {
		pr_err("no valid reg found for %pOFn\n", np);
		goto out_put;
	}

	hw_regs = ioremap(res.start, resource_size(&res));
	if (hw_regs) {
		pr_info("%s at 0x%pa mapped to 0x%p\n", name,
			&res.start, hw_regs);
	}

out_put:
	of_node_put(np);
out:
	return hw_regs;
}

static void __init wii_setup_arch(void)
{
	hw_ctrl = wii_ioremap_hw_regs("hw_ctrl", HW_CTRL_COMPATIBLE);
	hw_gpio = wii_ioremap_hw_regs("hw_gpio", HW_GPIO_COMPATIBLE);

Annotation

Implementation Notes