/* linux/arch/arm/mach-s3c2410/cpu.c
 *
 * Copyright (c) 2004 Simtec Electronics
 * 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/device.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/delay.h>

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

#include <asm/arch/regs-gpio.h>

#include "cpu.h"
#include "clock.h"
#include "s3c2410.h"
#include "s3c2440.h"

struct cpu_table {
        unsigned long   idcode;
        unsigned long   idmask;
        void            (*map_io)(struct map_desc *mach_desc, int size);
        void            (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
        void            (*init_clocks)(int xtal);
        int             (*init)(void);
        const char      *name;
};

/* table of supported CPUs */

static const char name_s3c2410[]  = "S3C2410";
static const char name_s3c2440[]  = "S3C2440";
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           = s3c2410_init,
                .name           = name_s3c2410a
        },
        {
                .idcode         = 0x32440000,
                .idmask         = 0xffffffff,
                .map_io         = s3c2440_map_io,
                .init_clocks    = s3c2440_init_clocks,
                .init_uarts     = s3c2440_init_uarts,
                .init           = s3c2440_init,
                .name           = name_s3c2440
        },
        {
                .idcode         = 0x32440001,
                .idmask         = 0xffffffff,
                .map_io         = s3c2440_map_io,
                .init_clocks    = s3c2440_init_clocks,
                .init_uarts     = s3c2440_init_uarts,
                .init           = s3c2440_init,
                .name           = name_s3c2440a
        }
};

/* minimal IO mapping */

static struct map_desc s3c_iodesc[] __initdata = {
        IODESC_ENT(GPIO),
        IODESC_ENT(IRQ),
        IODESC_ENT(MEMCTRL),
        IODESC_ENT(UART)
};


static struct cpu_table *
s3c_lookup_cpu(unsigned long idcode)
{
        struct cpu_table *tab;
        int count;

        tab = cpu_ids;
        for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
                if ((idcode & tab->idmask) == tab->idcode)
                        return tab;
        }

        return NULL;
}

/* board information */

static struct s3c24xx_board *board;

void s3c24xx_set_board(struct s3c24xx_board *b)
{
        int i;

        board = b;

        if (b->clocks_count != 0) {
                struct clk **ptr = b->clocks;;

                for (i = b->clocks_count; i > 0; i--, ptr++)
                        s3c24xx_register_clock(*ptr);
        }
}

/* cpu information */

static struct cpu_table *cpu;

void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
{
        unsigned long idcode;

        /* initialise the io descriptors we need for initialisation */
        iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));

        idcode = __raw_readl(S3C2410_GSTATUS1);
        cpu = s3c_lookup_cpu(idcode);

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

        if (cpu->map_io == NULL || cpu->init == NULL) {
                printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
                panic("Unsupported S3C24XX CPU");
        }

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

        (cpu->map_io)(mach_desc, size);
}

/* s3c24xx_init_clocks
 *
 * Initialise the clock subsystem and associated information from the
 * given master crystal value.
 *
 * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
 *      != 0 -> PLL crystal value in Hz
*/

void __init s3c24xx_init_clocks(int xtal)
{
        if (xtal != 0)
                s3c24xx_xtal = xtal;

        if (cpu == NULL)
                panic("s3c24xx_init_clocks: no cpu setup?\n");

        if (cpu->init_clocks == NULL)
                panic("s3c24xx_init_clocks: cpu has no clock init\n");
        else
                (cpu->init_clocks)(xtal);
}

void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
        if (cpu == NULL)
                return;

        if (cpu->init_uarts == NULL) {
                printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
        } else
                (cpu->init_uarts)(cfg, no);
}

static int __init s3c_arch_init(void)
{
        int ret;

        // do the correct init for cpu

        if (cpu == NULL)
                panic("s3c_arch_init: NULL cpu\n");

        ret = (cpu->init)();
        if (ret != 0)
                return ret;

        if (board != NULL) {
                struct platform_device **ptr = board->devices;
                int i;

                for (i = 0; i < board->devices_count; i++, ptr++) {
                        ret = platform_device_register(*ptr);

                        if (ret) {
                                printk(KERN_ERR "s3c24xx: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
                        }
                }

                /* mask any error, we may not need all these board
                 * devices */
                ret = 0;
        }

        return ret;
}

arch_initcall(s3c_arch_init);