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// $Id: vmax301.c,v 1.1.1.1 2004-04-15 01:51:47 phoenix Exp $

/* ######################################################################

   Tempustech VMAX SBC301 MTD Driver.

   The VMAx 301 is a SBC based on . It

   comes with three builtin AMD 29F016B flash chips and a socket for SRAM or

   more flash. Each unit has it's own 8k mapping into a settable region

   (0xD8000). There are two 8k mappings for each MTD, the first is always set

   to the lower 8k of the device the second is paged. Writing a 16 bit page

   value to anywhere in the first 8k will cause the second 8k to page around.

   To boot the device a bios extension must be installed into the first 8k

   of flash that is smart enough to copy itself down, page in the rest of

   itself and begin executing.

   ##################################################################### */

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/spinlock.h>

#include <asm/io.h>

#include <linux/mtd/map.h>

#define WINDOW_START 0xd8000

#define WINDOW_LENGTH 0x2000

#define WINDOW_SHIFT 25

#define WINDOW_MASK 0x1FFF

/* Actually we could use two spinlocks, but we'd have to have

   more private space in the struct map_info. We lose a little

   performance like this, but we'd probably lose more by having

   the extra indirection from having one of the map->map_priv

   fields pointing to yet another private struct.

*/

static spinlock_t vmax301_spin = SPIN_LOCK_UNLOCKED;

static void __vmax301_page(struct map_info *map, unsigned long page)

{

        writew(page, map->map_priv_2 - WINDOW_LENGTH);

        map->map_priv_1 = page;

}

static inline void vmax301_page(struct map_info *map,

                                  unsigned long ofs)

{

        unsigned long page = (ofs >> WINDOW_SHIFT);

        if (map->map_priv_1 != page)

                __vmax301_page(map, page);

}

static __u8 vmax301_read8(struct map_info *map, unsigned long ofs)

{

        __u8 ret;

        spin_lock(&vmax301_spin);

        vmax301_page(map, ofs);

        ret = readb(map->map_priv_2 + (ofs & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

        return ret;

}

static __u16 vmax301_read16(struct map_info *map, unsigned long ofs)

{

        __u16 ret;

        spin_lock(&vmax301_spin);

        vmax301_page(map, ofs);

        ret = readw(map->map_priv_2 + (ofs & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

        return ret;

}

static __u32 vmax301_read32(struct map_info *map, unsigned long ofs)

{

        __u32 ret;

        spin_lock(&vmax301_spin);

        vmax301_page(map, ofs);

        ret =  readl(map->map_priv_2 + (ofs & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

        return ret;

}

static void vmax301_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(&vmax301_spin);

                vmax301_page(map, from);

                memcpy_fromio(to, map->map_priv_2 + from, thislen);

                spin_unlock(&vmax301_spin);

                to += thislen;

                from += thislen;

                len -= thislen;

        }

}

static void vmax301_write8(struct map_info *map, __u8 d, unsigned long adr)

{

        spin_lock(&vmax301_spin);

        vmax301_page(map, adr);

        writeb(d, map->map_priv_2 + (adr & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

}

static void vmax301_write16(struct map_info *map, __u16 d, unsigned long adr)

{

        spin_lock(&vmax301_spin);

        vmax301_page(map, adr);

        writew(d, map->map_priv_2 + (adr & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

}

static void vmax301_write32(struct map_info *map, __u32 d, unsigned long adr)

{

        spin_lock(&vmax301_spin);

        vmax301_page(map, adr);

        writel(d, map->map_priv_2 + (adr & WINDOW_MASK));

        spin_unlock(&vmax301_spin);

}

static void vmax301_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(&vmax301_spin);

                vmax301_page(map, to);

                memcpy_toio(map->map_priv_2 + to, from, thislen);

                spin_unlock(&vmax301_spin);

                to += thislen;

                from += thislen;

                len -= thislen;

        }

}

static struct map_info vmax_map[2] = {

        {

                name: "VMAX301 Internal Flash",

                size: 3*2*1024*1024,

                buswidth: 1,

                read8: vmax301_read8,

                read16: vmax301_read16,

                read32: vmax301_read32,

                copy_from: vmax301_copy_from,

                write8: vmax301_write8,

                write16: vmax301_write16,

                write32: vmax301_write32,

                copy_to: vmax301_copy_to,

                map_priv_1: WINDOW_START + WINDOW_LENGTH,

                map_priv_2: 0xFFFFFFFF

        },

        {

                name: "VMAX301 Socket",

                size: 0,

                buswidth: 1,

                read8: vmax301_read8,

                read16: vmax301_read16,

                read32: vmax301_read32,

                copy_from: vmax301_copy_from,

                write8: vmax301_write8,

                write16: vmax301_write16,

                write32: vmax301_write32,

                copy_to: vmax301_copy_to,

                map_priv_1: WINDOW_START + (3*WINDOW_LENGTH),

                map_priv_2: 0xFFFFFFFF

        }

};

static struct mtd_info *vmax_mtd[2] = {NULL, NULL};

static void __exit cleanup_vmax301(void)

{

        int i;

        for (i=0; i<2; i++) {

                if (vmax_mtd[i]) {

                        del_mtd_device(vmax_mtd[i]);

                        map_destroy(vmax_mtd[i]);

                }

        }

        iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START);

}

int __init init_vmax301(void)

{

        int i;

        unsigned long iomapadr;

        // Print out our little header..

        printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START,

               WINDOW_START+4*WINDOW_LENGTH);

        iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4);

        if (!iomapadr) {

                printk("Failed to ioremap memory region\n");

                return -EIO;

        }

        /* Put the address in the map's private data area.

           We store the actual MTD IO address rather than the

           address of the first half, because it's used more

           often.

        */

        vmax_map[0].map_priv_1 = iomapadr + WINDOW_START;

        vmax_map[1].map_priv_1 = iomapadr + (3*WINDOW_START);

        for (i=0; i<2; i++) {

                vmax_mtd[i] = do_map_probe("cfi_probe", &vmax_map[i]);

                if (!vmax_mtd[i])

                        vmax_mtd[i] = do_map_probe("jedec", &vmax_map[i]);

                if (!vmax_mtd[i])

                        vmax_mtd[i] = do_map_probe("map_ram", &vmax_map[i]);

                if (!vmax_mtd[i])

                        vmax_mtd[i] = do_map_probe("map_rom", &vmax_map[i]);

                if (vmax_mtd[i]) {

                        vmax_mtd[i]->module = THIS_MODULE;

                        add_mtd_device(vmax_mtd[i]);

                }

        }

        if (!vmax_mtd[1] && !vmax_mtd[2]) {

                iounmap((void *)iomapadr);

                return -ENXIO;

        }

        return 0;

}

module_init(init_vmax301);

module_exit(cleanup_vmax301);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");

MODULE_DESCRIPTION("MTD map driver for Tempustech VMAX SBC301 board");