arch/arm/mach-s3c/init.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-s3c/init.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-s3c/init.c
Extension
.c
Size
3642 bytes
Lines
152
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
//
// Copyright (c) 2008 Simtec Electronics
//	Ben Dooks <ben@simtec.co.uk>
//	http://armlinux.simtec.co.uk/
//
// S3C series CPU initialisation

/*
 * NOTE: Code in this file is not used on S3C64xx when booting with
 * Device Tree support.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/serial_s3c.h>
#include <linux/platform_device.h>
#include <linux/of.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "cpu.h"
#include "devs.h"

static struct cpu_table *cpu;

static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
						struct cpu_table *tab,
						unsigned int count)
{
	for (; count != 0; count--, tab++) {
		if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
			return tab;
	}

	return NULL;
}

void __init s3c_init_cpu(unsigned long idcode,
			 struct cpu_table *cputab, unsigned int cputab_size)
{
	cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);

	if (cpu == NULL) {
		printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
		panic("Unknown S3C24XX CPU");
	}

	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);

	if (cpu->init == NULL) {
		printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
		panic("Unsupported Samsung CPU");
	}

	if (cpu->map_io)
		cpu->map_io();

	pr_err("The platform is deprecated and scheduled for removal. Please reach to the maintainers of the platform and linux-samsung-soc@vger.kernel.org if you still use it.  Without such feedback, the platform will be removed after 2022.\n");
}

/* uart management */
#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
static int nr_uarts __initdata = 0;

#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
#endif

/* s3c24xx_init_uartdevs
 *
 * copy the specified platform data and configuration into our central
 * set of devices, before the data is thrown away after the init process.
 *
 * This also fills in the array passed to the serial driver for the
 * early initialisation of the console.
*/

void __init s3c24xx_init_uartdevs(char *name,
				  struct s3c24xx_uart_resources *res,
				  struct s3c2410_uartcfg *cfg, int no)
{
#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
	struct platform_device *platdev;
	struct s3c2410_uartcfg *cfgptr = uart_cfgs;
	struct s3c24xx_uart_resources *resp;

Annotation

Implementation Notes