- 根目录:
- arch
- arm
- plat-s3c24xx
- cpu.c
/* linux/arch/arm/plat-s3c24xx/cpu.c
*
* Copyright (c) 2004-2005 Simtec Electronics
* http://www.simtec.co.uk/products/SWLINUX/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C24XX CPU Support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/cacheflush.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <mach/system-reset.h>
#include <mach/regs-gpio.h>
#include <plat/regs-serial.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
#include <plat/s3c2400.h>
#include <plat/s3c2410.h>
#include <plat/s3c2412.h>
#include <plat/s3c2416.h>
#include <plat/s3c244x.h>
#include <plat/s3c2443.h>
/* table of supported CPUs */
static const char name_s3c2400[] = "S3C2400";
static const char name_s3c2410[] = "S3C2410";
static const char name_s3c2412[] = "S3C2412";
static const char name_s3c2416[] = "S3C2416/S3C2450";
static const char name_s3c2440[] = "S3C2440";
static const char name_s3c2442[] = "S3C2442";
static const char name_s3c2442b[] = "S3C2442B";
static const char name_s3c2443[] = "S3C2443";
static const char name_s3c2410a[] = "S3C2410A";
static const char name_s3c2440a[] = "S3C2440A";
static struct cpu_table cpu_ids[] __initdata = {
{
.idcode = 0x32410000,
.idmask = 0xffffffff,
.map_io = s3c2410_map_io,
.init_clocks = s3c2410_init_clocks,
.init_uarts = s3c2410_init_uarts,
.init = s3c2410_init,
.name = name_s3c2410
},
{
.idcode = 0x32410002,
.idmask = 0xffffffff,
.map_io = s3c2410_map_io,
.init_clocks = s3c2410_init_clocks,
.init_uarts = s3c2410_init_uarts,
.init = s3c2410a_init,
.name = name_s3c2410a
},
{
.idcode = 0x32440000,
.idmask = 0xffffffff,
.map_io = s3c2440_map_io,
.init_clocks = s3c244x_init_clocks,
.init_uarts = s3c244x_init_uarts,
.init = s3c2440_init,
.name = name_s3c2440
},
{
.idcode = 0x32440001,
.idmask = 0xffffffff,
.map_io = s3c2440_map_io,
.init_clocks = s3c244x_init_clocks,
.init_uarts = s3c244x_init_uarts,
.init = s3c2440_init,
.name = name_s3c2440a
},
{
.idcode = 0x32440aaa,
.idmask = 0xffffffff,
.map_io = s3c2442_map_io,
.init_clocks = s3c244x_init_clocks,
.init_uarts = s3c244x_init_uarts,
.init = s3c2442_init,
.name = name_s3c2442
},
{
.idcode = 0x32440aab,
.idmask = 0xffffffff,
.map_io = s3c2442_map_io,
.init_clocks = s3c244x_init_clocks,
.init_uarts = s3c244x_init_uarts,
.init = s3c2442_init,
.name = name_s3c2442b
},
{
.idcode = 0x32412001,
.idmask = 0xffffffff,
.map_io = s3c2412_map_io,
.init_clocks = s3c2412_init_clocks,
.init_uarts = s3c2412_init_uarts,
.init = s3c2412_init,
.name = name_s3c2412,
},
{ /* a newer version of the s3c2412 */
.idcode = 0x32412003,
.idmask = 0xffffffff,
.map_io = s3c2412_map_io,
.init_clocks = s3c2412_init_clocks,
.init_uarts = s3c2412_init_uarts,
.init = s3c2412_init,
.name = name_s3c2412,
},
{ /* a strange version of the s3c2416 */
.idcode = 0x32450003,
.idmask = 0xffffffff,
.map_io = s3c2416_map_io,
.init_clocks = s3c2416_init_clocks,
.init_uarts = s3c2416_init_uarts,
.init = s3c2416_init,
.name = name_s3c2416,
},
{
.idcode = 0x32443001,
.idmask = 0xffffffff,
.map_io = s3c2443_map_io,
.init_clocks = s3c2443_init_clocks,
.init_uarts = s3c2443_init_uarts,
.init = s3c2443_init,
.name = name_s3c2443,
},
{
.idcode = 0x0, /* S3C2400 doesn't have an idcode */
.idmask = 0xffffffff,
.map_io = s3c2400_map_io,
.init_clocks = s3c2400_init_clocks,
.init_uarts = s3c2400_init_uarts,
.init = s3c2400_init,
.name = name_s3c2400
},
};
/* minimal IO mapping */
static struct map_desc s3c_iodesc[] __initdata = {
IODESC_ENT(GPIO),
IODESC_ENT(IRQ),
IODESC_ENT(MEMCTRL),
IODESC_ENT(UART)
};
/* read cpu identificaiton code */
static unsigned long s3c24xx_read_idcode_v5(void)
{
#if defined(CONFIG_CPU_S3C2416)
/* s3c2416 is v5, with S3C24XX_GSTATUS1 instead of S3C2412_GSTATUS1 */
u32 gs = __raw_readl(S3C24XX_GSTATUS1);
/* test for s3c2416 or similar device */
if ((gs >> 16) == 0x3245)
return gs;
#endif
#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
return __raw_readl(S3C2412_GSTATUS1);
#else
return 1UL; /* don't look like an 2400 */
#endif
}
static unsigned long s3c24xx_read_idcode_v4(void)
{
#ifndef CONFIG_CPU_S3C2400
return __raw_readl(S3C2410_GSTATUS1);
#else
return 0UL;
#endif
}
/* Hook for arm_pm_restart to ensure we execute the reset code
* with the caches enabled. It seems at least the S3C2440 has a problem
* resetting if there is bus activity interrupted by the reset.
*/
static void s3c24xx_pm_restart(char mode, const char *cmd)
{
if (mode != 's') {
unsigned long flags;
local_irq_save(flags);
__cpuc_flush_kern_all();
__cpuc_flush_user_all();
arch_reset(mode, cmd);
local_irq_restore(flags);
}
/* fallback, or unhandled */
arm_machine_restart(mode, cmd);
}
void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
{
unsigned long idcode = 0x0;
/* initialise the io descriptors we need for initialisation */
iotable_init(mach_desc, size);
iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
if (cpu_architecture() >= CPU_ARCH_ARMv5) {
idcode = s3c24xx_read_idcode_v5();
} else {
idcode = s3c24xx_read_idcode_v4();
}
arm_pm_restart = s3c24xx_pm_restart;
s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids));
}