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/****************************************************************************/

/*

 *      nettel.c -- mappings for NETtel/SecureEdge/SnapGear (x86) boards.

 *

 *      (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)

 *      (C) Copyright 2001-2002, SnapGear (www.snapgear.com)

 *

 *      $Id: nettel.c,v 1.12 2005/11/29 14:30:00 gleixner Exp $

 */

/****************************************************************************/

#include <linux/module.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/map.h>

#include <linux/mtd/partitions.h>

#include <linux/mtd/cfi.h>

#include <linux/reboot.h>

#include <linux/err.h>

#include <linux/kdev_t.h>

#include <linux/root_dev.h>

#include <asm/io.h>

/****************************************************************************/

#define INTEL_BUSWIDTH          1

#define AMD_WINDOW_MAXSIZE      0x00200000

#define AMD_BUSWIDTH            1

/*

 *      PAR masks and shifts, assuming 64K pages.

 */

#define SC520_PAR_ADDR_MASK     0x00003fff

#define SC520_PAR_ADDR_SHIFT    16

#define SC520_PAR_TO_ADDR(par) \

        (((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)

#define SC520_PAR_SIZE_MASK     0x01ffc000

#define SC520_PAR_SIZE_SHIFT    2

#define SC520_PAR_TO_SIZE(par) \

        ((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))

#define SC520_PAR(cs, addr, size) \

        ((cs) | \

        ((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \

        (((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))

#define SC520_PAR_BOOTCS        0x8a000000

#define SC520_PAR_ROMCS1        0xaa000000

#define SC520_PAR_ROMCS2        0xca000000      /* Cache disabled, 64K page */

static void *nettel_mmcrp = NULL;

#ifdef CONFIG_MTD_CFI_INTELEXT

static struct mtd_info *intel_mtd;

#endif

static struct mtd_info *amd_mtd;

/****************************************************************************/

/****************************************************************************/

#ifdef CONFIG_MTD_CFI_INTELEXT

static struct map_info nettel_intel_map = {

        .name = "SnapGear Intel",

        .size = 0,

        .bankwidth = INTEL_BUSWIDTH,

};

static struct mtd_partition nettel_intel_partitions[] = {

        {

                .name = "SnapGear kernel",

                .offset = 0,

                .size = 0x000e0000

        },

        {

                .name = "SnapGear filesystem",

                .offset = 0x00100000,

        },

        {

                .name = "SnapGear config",

                .offset = 0x000e0000,

                .size = 0x00020000

        },

        {

                .name = "SnapGear Intel",

                .offset = 0

        },

        {

                .name = "SnapGear BIOS Config",

                .offset = 0x007e0000,

                .size = 0x00020000

        },

        {

                .name = "SnapGear BIOS",

                .offset = 0x007e0000,

                .size = 0x00020000

        },

};

#endif

static struct map_info nettel_amd_map = {

        .name = "SnapGear AMD",

        .size = AMD_WINDOW_MAXSIZE,

        .bankwidth = AMD_BUSWIDTH,

};

static struct mtd_partition nettel_amd_partitions[] = {

        {

                .name = "SnapGear BIOS config",

                .offset = 0x000e0000,

                .size = 0x00010000

        },

        {

                .name = "SnapGear BIOS",

                .offset = 0x000f0000,

                .size = 0x00010000

        },

        {

                .name = "SnapGear AMD",

                .offset = 0

        },

        {

                .name = "SnapGear high BIOS",

                .offset = 0x001f0000,

                .size = 0x00010000

        }

};

#define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)

/****************************************************************************/

#ifdef CONFIG_MTD_CFI_INTELEXT

/*

 *      Set the Intel flash back to read mode since some old boot

 *      loaders don't.

 */

static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)

{

        struct cfi_private *cfi = nettel_intel_map.fldrv_priv;

        unsigned long b;

        /* Make sure all FLASH chips are put back into read mode */

        for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {

                cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,

                        cfi->device_type, NULL);

        }

        return(NOTIFY_OK);

}

static struct notifier_block nettel_notifier_block = {

        nettel_reboot_notifier, NULL, 0

};

#endif

/****************************************************************************/

static int __init nettel_init(void)

{

        volatile unsigned long *amdpar;

        unsigned long amdaddr, maxsize;

        int num_amd_partitions=0;

#ifdef CONFIG_MTD_CFI_INTELEXT

        volatile unsigned long *intel0par, *intel1par;

        unsigned long orig_bootcspar, orig_romcs1par;

        unsigned long intel0addr, intel0size;

        unsigned long intel1addr, intel1size;

        int intelboot, intel0cs, intel1cs;

        int num_intel_partitions;

#endif

        int rc = 0;

        nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);

        if (nettel_mmcrp == NULL) {

                printk("SNAPGEAR: failed to disable MMCR cache??\n");

                return(-EIO);

        }

        /* Set CPU clock to be 33.000MHz */

        *((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;

        amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);

#ifdef CONFIG_MTD_CFI_INTELEXT

        intelboot = 0;

        intel0cs = SC520_PAR_ROMCS1;

        intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);

        intel1cs = SC520_PAR_ROMCS2;

        intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);

        /*

         *      Save the CS settings then ensure ROMCS1 and ROMCS2 are off,

         *      otherwise they might clash with where we try to map BOOTCS.

         */

        orig_bootcspar = *amdpar;

        orig_romcs1par = *intel0par;

        *intel0par = 0;

        *intel1par = 0;

#endif

        /*

         *      The first thing to do is determine if we have a separate

         *      boot FLASH device. Typically this is a small (1 to 2MB)

         *      AMD FLASH part. It seems that device size is about the

         *      only way to tell if this is the case...

         */

        amdaddr = 0x20000000;

        maxsize = AMD_WINDOW_MAXSIZE;

        *amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);

        __asm__ ("wbinvd");

        nettel_amd_map.phys = amdaddr;

        nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);

        if (!nettel_amd_map.virt) {

                printk("SNAPGEAR: failed to ioremap() BOOTCS\n");

                iounmap(nettel_mmcrp);

                return(-EIO);

        }

        simple_map_init(&nettel_amd_map);

        if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {

                printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",

                        amd_mtd->size>>10);

                amd_mtd->owner = THIS_MODULE;

                /* The high BIOS partition is only present for 2MB units */

                num_amd_partitions = NUM_AMD_PARTITIONS;

                if (amd_mtd->size < AMD_WINDOW_MAXSIZE)

                        num_amd_partitions--;

                /* Don't add the partition until after the primary INTEL's */

#ifdef CONFIG_MTD_CFI_INTELEXT

                /*

                 *      Map the Intel flash into memory after the AMD

                 *      It has to start on a multiple of maxsize.

                 */

                maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);

                if (maxsize < (32 * 1024 * 1024))

                        maxsize = (32 * 1024 * 1024);

                intel0addr = amdaddr + maxsize;

#endif

        } else {

#ifdef CONFIG_MTD_CFI_INTELEXT

                /* INTEL boot FLASH */

                intelboot++;

                if (!orig_romcs1par) {

                        intel0cs = SC520_PAR_BOOTCS;

                        intel0par = (volatile unsigned long *)

                                (nettel_mmcrp + 0xc4);

                        intel1cs = SC520_PAR_ROMCS1;

                        intel1par = (volatile unsigned long *)

                                (nettel_mmcrp + 0xc0);

                        intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);

                        maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);

                } else {

                        /* Kernel base is on ROMCS1, not BOOTCS */

                        intel0cs = SC520_PAR_ROMCS1;

                        intel0par = (volatile unsigned long *)

                                (nettel_mmcrp + 0xc0);

                        intel1cs = SC520_PAR_BOOTCS;

                        intel1par = (volatile unsigned long *)

                                (nettel_mmcrp + 0xc4);

                        intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);

                        maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);

                }

                /* Destroy useless AMD MTD mapping */

                amd_mtd = NULL;

                iounmap(nettel_amd_map.virt);

                nettel_amd_map.virt = NULL;

#else

                /* Only AMD flash supported */

                rc = -ENXIO;

                goto out_unmap2;

#endif

        }

#ifdef CONFIG_MTD_CFI_INTELEXT

        /*

         *      We have determined the INTEL FLASH configuration, so lets

         *      go ahead and probe for them now.

         */

        /* Set PAR to the maximum size */

        if (maxsize < (32 * 1024 * 1024))

                maxsize = (32 * 1024 * 1024);

        *intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);

        /* Turn other PAR off so the first probe doesn't find it */

        *intel1par = 0;

        /* Probe for the size of the first Intel flash */

        nettel_intel_map.size = maxsize;

        nettel_intel_map.phys = intel0addr;

        nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);

        if (!nettel_intel_map.virt) {

                printk("SNAPGEAR: failed to ioremap() ROMCS1\n");

                rc = -EIO;

                goto out_unmap2;

        }

        simple_map_init(&nettel_intel_map);

        intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);

        if (!intel_mtd) {

                rc = -ENXIO;

                goto out_unmap1;

        }

        /* Set PAR to the detected size */

        intel0size = intel_mtd->size;

        *intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);

        /*

         *      Map second Intel FLASH right after first. Set its size to the

         *      same maxsize used for the first Intel FLASH.

         */

        intel1addr = intel0addr + intel0size;

        *intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);

        __asm__ ("wbinvd");

        maxsize += intel0size;

        /* Delete the old map and probe again to do both chips */

        map_destroy(intel_mtd);

        intel_mtd = NULL;

        iounmap(nettel_intel_map.virt);

        nettel_intel_map.size = maxsize;

        nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);

        if (!nettel_intel_map.virt) {

                printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");

                rc = -EIO;

                goto out_unmap2;

        }

        intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);

        if (! intel_mtd) {

                rc = -ENXIO;

                goto out_unmap1;

        }

        intel1size = intel_mtd->size - intel0size;

        if (intel1size > 0) {

                *intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);

                __asm__ ("wbinvd");

        } else {

                *intel1par = 0;

        }

        printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %dK\n",

                (intel_mtd->size >> 10));

        intel_mtd->owner = THIS_MODULE;

        num_intel_partitions = sizeof(nettel_intel_partitions) /

                sizeof(nettel_intel_partitions[0]);

        if (intelboot) {

                /*

                 *      Adjust offset and size of last boot partition.

                 *      Must allow for BIOS region at end of FLASH.

                 */

                nettel_intel_partitions[1].size = (intel0size + intel1size) -

                        (1024*1024 + intel_mtd->erasesize);

                nettel_intel_partitions[3].size = intel0size + intel1size;

                nettel_intel_partitions[4].offset =

                        (intel0size + intel1size) - intel_mtd->erasesize;

                nettel_intel_partitions[4].size = intel_mtd->erasesize;

                nettel_intel_partitions[5].offset =

                        nettel_intel_partitions[4].offset;

                nettel_intel_partitions[5].size =

                        nettel_intel_partitions[4].size;

        } else {

                /* No BIOS regions when AMD boot */

                num_intel_partitions -= 2;

        }

        rc = add_mtd_partitions(intel_mtd, nettel_intel_partitions,

                num_intel_partitions);

#endif

        if (amd_mtd) {

                rc = add_mtd_partitions(amd_mtd, nettel_amd_partitions,

                        num_amd_partitions);

        }

#ifdef CONFIG_MTD_CFI_INTELEXT

        register_reboot_notifier(&nettel_notifier_block);

#endif

        return(rc);

#ifdef CONFIG_MTD_CFI_INTELEXT

out_unmap1:

        iounmap(nettel_intel_map.virt);

#endif

out_unmap2:

        iounmap(nettel_mmcrp);

        iounmap(nettel_amd_map.virt);

        return(rc);

}

/****************************************************************************/

static void __exit nettel_cleanup(void)

{

#ifdef CONFIG_MTD_CFI_INTELEXT

        unregister_reboot_notifier(&nettel_notifier_block);

#endif

        if (amd_mtd) {

                del_mtd_partitions(amd_mtd);

                map_destroy(amd_mtd);

        }

        if (nettel_mmcrp) {

                iounmap(nettel_mmcrp);

                nettel_mmcrp = NULL;

        }

        if (nettel_amd_map.virt) {

                iounmap(nettel_amd_map.virt);

                nettel_amd_map.virt = NULL;

        }

#ifdef CONFIG_MTD_CFI_INTELEXT

        if (intel_mtd) {

                del_mtd_partitions(intel_mtd);

                map_destroy(intel_mtd);

        }

        if (nettel_intel_map.virt) {

                iounmap(nettel_intel_map.virt);

                nettel_intel_map.virt = NULL;

        }

#endif

}

/****************************************************************************/

module_init(nettel_init);

module_exit(nettel_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");

MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");

/****************************************************************************/