arch/mips/n64/init.c

Source file repositories/reference/linux-study-clean/arch/mips/n64/init.c

File Facts

System
Linux kernel
Corpus path
arch/mips/n64/init.c
Extension
.c
Size
3833 bytes
Lines
165
Domain
Architecture Layer
Bucket
arch/mips
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
/*
 *  Nintendo 64 init.
 *
 *  Copyright (C) 2021	Lauri Kasanen
 */
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/memblock.h>
#include <linux/platform_device.h>
#include <linux/platform_data/simplefb.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/fw/fw.h>
#include <asm/time.h>

#define IO_MEM_RESOURCE_START	0UL
#define IO_MEM_RESOURCE_END	0x1fffffffUL

/*
 * System-specifc irq names for clarity
 */
#define MIPS_CPU_IRQ(x)		(MIPS_CPU_IRQ_BASE + (x))
#define MIPS_SOFTINT0_IRQ	MIPS_CPU_IRQ(0)
#define MIPS_SOFTINT1_IRQ	MIPS_CPU_IRQ(1)
#define RCP_IRQ			MIPS_CPU_IRQ(2)
#define CART_IRQ		MIPS_CPU_IRQ(3)
#define PRENMI_IRQ		MIPS_CPU_IRQ(4)
#define RDBR_IRQ		MIPS_CPU_IRQ(5)
#define RDBW_IRQ		MIPS_CPU_IRQ(6)
#define TIMER_IRQ		MIPS_CPU_IRQ(7)

static void __init iomem_resource_init(void)
{
	iomem_resource.start = IO_MEM_RESOURCE_START;
	iomem_resource.end = IO_MEM_RESOURCE_END;
}

const char *get_system_type(void)
{
	return "Nintendo 64";
}

void __init prom_init(void)
{
	fw_init_cmdline();
}

#define W 320
#define H 240
#define REG_BASE ((u32 __iomem *) CKSEG1ADDR(0x4400000))

static void __init n64rdp_write_reg(const u8 reg, const u32 value)
{
	__raw_writel(value, REG_BASE + reg);
}

#undef REG_BASE

static const u32 ntsc_320[] __initconst = {
	0x00013212, 0x00000000, 0x00000140, 0x00000200,
	0x00000000, 0x03e52239, 0x0000020d, 0x00000c15,
	0x0c150c15, 0x006c02ec, 0x002501ff, 0x000e0204,
	0x00000200, 0x00000400
};

#define MI_REG_BASE 0x4300000
#define NUM_MI_REGS 4
#define AI_REG_BASE 0x4500000
#define NUM_AI_REGS 6
#define PI_REG_BASE 0x4600000
#define NUM_PI_REGS 5
#define SI_REG_BASE 0x4800000
#define NUM_SI_REGS 7

static int __init n64_platform_init(void)
{
	static const char simplefb_resname[] = "FB";
	static const struct simplefb_platform_data mode = {
		.width = W,
		.height = H,
		.stride = W * 2,
		.format = "r5g5b5a1"
	};
	struct resource res[3];
	void *orig;
	unsigned long phys;
	unsigned i;

Annotation

Implementation Notes