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/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,

                SBC-GXm and SBC-GX1 series boards.

   Copyright (C) 2001 Arcom Control System Ltd

   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

   $Id: sbc_gxx.c,v 1.1.1.1 2004-04-15 01:51:56 phoenix Exp $

The SBC-MediaGX / SBC-GXx has up to 16 MiB of

Intel StrataFlash (28F320/28F640) in x8 mode.

This driver uses the CFI probe and Intel Extended Command Set drivers.

The flash is accessed as follows:

   16 KiB memory window at 0xdc000-0xdffff

   Two IO address locations for paging

   0x258

       bit 0-7: address bit 14-21

   0x259

       bit 0-1: address bit 22-23

       bit 7:   0 - reset/powered down

                1 - device enabled

The single flash device is divided into 3 partition which appear as

separate MTD devices.

25/04/2001 AJL (Arcom)  Modified signon strings and partition sizes

                        (to support bzImages up to 638KiB-ish)

*/

// Includes

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <asm/io.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/map.h>

#include <linux/mtd/partitions.h>

// Defines

// - Hardware specific

#define WINDOW_START 0xdc000

/* Number of bits in offset. */

#define WINDOW_SHIFT 14

#define WINDOW_LENGTH (1 << WINDOW_SHIFT)

/* The bits for the offset into the window. */

#define WINDOW_MASK (WINDOW_LENGTH-1)

#define PAGE_IO 0x258

#define PAGE_IO_SIZE 2

/* bit 7 of 0x259 must be 1 to enable device. */

#define DEVICE_ENABLE 0x8000

// - Flash / Partition sizing

#define MAX_SIZE_KiB             16384

#define BOOT_PARTITION_SIZE_KiB  768

#define DATA_PARTITION_SIZE_KiB  1280

#define APP_PARTITION_SIZE_KiB   6144

// Globals

static volatile int page_in_window = -1; // Current page in window.

static unsigned long iomapadr;

static spinlock_t sbc_gxx_spin = SPIN_LOCK_UNLOCKED;

/* partition_info gives details on the logical partitions that the split the

 * single flash device into. If the size if zero we use up to the end of the

 * device. */

static struct mtd_partition partition_info[]={

    { name: "SBC-GXx flash boot partition",

      offset: 0,

      size:   BOOT_PARTITION_SIZE_KiB*1024 },

    { name: "SBC-GXx flash data partition",

      offset: BOOT_PARTITION_SIZE_KiB*1024,

      size: (DATA_PARTITION_SIZE_KiB)*1024 },

    { name: "SBC-GXx flash application partition",

      offset: (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }

};

#define NUM_PARTITIONS 3

static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)

{

        unsigned long page = ofs >> WINDOW_SHIFT;

        if( page!=page_in_window ) {

                outw( page | DEVICE_ENABLE, PAGE_IO );

                page_in_window = page;

        }

}

static __u8 sbc_gxx_read8(struct map_info *map, unsigned long ofs)

{

        __u8 ret;

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, ofs);

        ret = readb(iomapadr + (ofs & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

        return ret;

}

static __u16 sbc_gxx_read16(struct map_info *map, unsigned long ofs)

{

        __u16 ret;

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, ofs);

        ret = readw(iomapadr + (ofs & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

        return ret;

}

static __u32 sbc_gxx_read32(struct map_info *map, unsigned long ofs)

{

        __u32 ret;

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, ofs);

        ret = readl(iomapadr + (ofs & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

        return ret;

}

static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)

{

        while(len) {

                unsigned long thislen = len;

                if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))

                        thislen = WINDOW_LENGTH-(from & WINDOW_MASK);

                spin_lock(&sbc_gxx_spin);

                sbc_gxx_page(map, from);

                memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);

                spin_unlock(&sbc_gxx_spin);

                (__u8*)to += thislen;

                from += thislen;

                len -= thislen;

        }

}

static void sbc_gxx_write8(struct map_info *map, __u8 d, unsigned long adr)

{

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, adr);

        writeb(d, iomapadr + (adr & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

}

static void sbc_gxx_write16(struct map_info *map, __u16 d, unsigned long adr)

{

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, adr);

        writew(d, iomapadr + (adr & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

}

static void sbc_gxx_write32(struct map_info *map, __u32 d, unsigned long adr)

{

        spin_lock(&sbc_gxx_spin);

        sbc_gxx_page(map, adr);

        writel(d, iomapadr + (adr & WINDOW_MASK));

        spin_unlock(&sbc_gxx_spin);

}

static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)

{

        while(len) {

                unsigned long thislen = len;

                if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))

                        thislen = WINDOW_LENGTH-(to & WINDOW_MASK);

                spin_lock(&sbc_gxx_spin);

                sbc_gxx_page(map, to);

                memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);

                spin_unlock(&sbc_gxx_spin);

                to += thislen;

                from += thislen;

                len -= thislen;

        }

}

static struct map_info sbc_gxx_map = {

        name: "SBC-GXx flash",

        size: MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount

                         of flash so the cfi probe routines find all

                         the chips */

        buswidth: 1,

        read8: sbc_gxx_read8,

        read16: sbc_gxx_read16,

        read32: sbc_gxx_read32,

        copy_from: sbc_gxx_copy_from,

        write8: sbc_gxx_write8,

        write16: sbc_gxx_write16,

        write32: sbc_gxx_write32,

        copy_to: sbc_gxx_copy_to

};

/* MTD device for all of the flash. */

static struct mtd_info *all_mtd;

static void cleanup_sbc_gxx(void)

{

        if( all_mtd ) {

                del_mtd_partitions( all_mtd );

                map_destroy( all_mtd );

        }

        iounmap((void *)iomapadr);

        release_region(PAGE_IO,PAGE_IO_SIZE);

}

int __init init_sbc_gxx(void)

{

        if (check_region(PAGE_IO,PAGE_IO_SIZE) != 0) {

                printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",

                        sbc_gxx_map.name,

                        PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );

                return -EAGAIN;

        }

        iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);

        if (!iomapadr) {

                printk( KERN_ERR"%s: failed to ioremap memory region\n",

                        sbc_gxx_map.name );

                return -EIO;

        }

        request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash" );

        printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",

                sbc_gxx_map.name,

                PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,

                WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );

        /* Probe for chip. */

        all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );

        if( !all_mtd ) {

                cleanup_sbc_gxx();

                return -ENXIO;

        }

        all_mtd->module=THIS_MODULE;

        /* Create MTD devices for each partition. */

        add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );

        return 0;

}

module_init(init_sbc_gxx);

module_exit(cleanup_sbc_gxx);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Arcom Control Systems Ltd.");

MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");