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/*

 *  linux/fs/partitions/acorn.c

 *

 *  Copyright (c) 1996-2000 Russell King.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 *  Scan ADFS partitions on hard disk drives.

 */

#include <linux/config.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/kdev_t.h>

#include <linux/major.h>

#include <linux/string.h>

#include <linux/genhd.h>

#include <linux/fs.h>

#include <linux/pagemap.h>

#include "check.h"

#include "acorn.h"

static void

adfspart_setgeometry(kdev_t dev, unsigned int secspertrack, unsigned int heads)

{

#ifdef CONFIG_BLK_DEV_MFM

        extern void xd_set_geometry(kdev_t dev, unsigned char, unsigned char,

                                    unsigned long, unsigned int);

        if (MAJOR(dev) == MFM_ACORN_MAJOR) {

                unsigned long totalblocks = hd->part[MINOR(dev)].nr_sects;

                xd_set_geometry(dev, secspertrack, heads, totalblocks, 1);

        }

#endif

}

static struct adfs_discrecord *

adfs_partition(struct gendisk *hd, char *name, char *data,

               unsigned long first_sector, int minor)

{

        struct adfs_discrecord *dr;

        unsigned int nr_sects;

        if (adfs_checkbblk(data))

                return NULL;

        dr = (struct adfs_discrecord *)(data + 0x1c0);

        if (dr->disc_size == 0 && dr->disc_size_high == 0)

                return NULL;

        nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |

                   (le32_to_cpu(dr->disc_size) >> 9);

        if (name)

                printk(" [%s]", name);

        add_gd_partition(hd, minor, first_sector, nr_sects);

        return dr;

}

#ifdef CONFIG_ACORN_PARTITION_RISCIX

static int

riscix_partition(struct gendisk *hd, struct block_device *bdev,

                unsigned long first_sect, int minor, unsigned long nr_sects)

{

        Sector sect;

        struct riscix_record *rr;

        rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, &sect);

        if (!rr)

                return -1;

        printk(" [RISCiX]");

        if (rr->magic == RISCIX_MAGIC) {

                unsigned long size = nr_sects > 2 ? 2 : nr_sects;

                int part;

                printk(" <");

                add_gd_partition(hd, minor++, first_sect, size);

                for (part = 0; part < 8; part++) {

                        if (rr->part[part].one &&

                            memcmp(rr->part[part].name, "All\0", 4)) {

                                add_gd_partition(hd, minor++,

                                                le32_to_cpu(rr->part[part].start),

                                                le32_to_cpu(rr->part[part].length));

                                printk("(%s)", rr->part[part].name);

                        }

                }

                printk(" >\n");

        } else {

                add_gd_partition(hd, minor++, first_sect, nr_sects);

        }

        put_dev_sector(sect);

        return minor;

}

#endif

static int

linux_partition(struct gendisk *hd, struct block_device *bdev,

                unsigned long first_sect, int minor, unsigned long nr_sects)

{

        Sector sect;

        struct linux_part *linuxp;

        unsigned int mask = (1 << hd->minor_shift) - 1;

        unsigned long size = nr_sects > 2 ? 2 : nr_sects;

        printk(" [Linux]");

        add_gd_partition(hd, minor++, first_sect, size);

        linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, &sect);

        if (!linuxp)

                return -1;

        printk(" <");

        while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||

               linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {

                if (!(minor & mask))

                        break;

                add_gd_partition(hd, minor++, first_sect +

                                 le32_to_cpu(linuxp->start_sect),

                                 le32_to_cpu(linuxp->nr_sects));

                linuxp ++;

        }

        printk(" >");

        put_dev_sector(sect);

        return minor;

}

#ifdef CONFIG_ACORN_PARTITION_CUMANA

static int

adfspart_check_CUMANA(struct gendisk *hd, struct block_device *bdev,

                      unsigned long first_sector, int minor)

{

        unsigned int start_blk = 0, mask = (1 << hd->minor_shift) - 1;

        Sector sect;

        unsigned char *data;

        char *name = "CUMANA/ADFS";

        int first = 1;

        /*

         * Try Cumana style partitions - sector 3 contains ADFS boot block

         * with pointer to next 'drive'.

         *

         * There are unknowns in this code - is the 'cylinder number' of the

         * next partition relative to the start of this one - I'm assuming

         * it is.

         *

         * Also, which ID did Cumana use?

         *

         * This is totally unfinished, and will require more work to get it

         * going. Hence it is totally untested.

         */

        do {

                struct adfs_discrecord *dr;

                unsigned int nr_sects;

                if (!(minor & mask))

                        break;

                data = read_dev_sector(bdev, start_blk * 2 + 6, &sect);

                if (!data)

                        return -1;

                dr = adfs_partition(hd, name, data, first_sector, minor++);

                if (!dr)

                        break;

                name = NULL;

                nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *

                           (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *

                           dr->secspertrack;

                if (!nr_sects)

                        break;

                first = 0;

                first_sector += nr_sects;

                start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);

                nr_sects = 0; /* hmm - should be partition size */

                switch (data[0x1fc] & 15) {

                case 0: /* No partition / ADFS? */

                        break;

#ifdef CONFIG_ACORN_PARTITION_RISCIX

                case PARTITION_RISCIX_SCSI:

                        /* RISCiX - we don't know how to find the next one. */

                        minor = riscix_partition(hd, bdev, first_sector,

                                                 minor, nr_sects);

                        break;

#endif

                case PARTITION_LINUX:

                        minor = linux_partition(hd, bdev, first_sector,

                                                minor, nr_sects);

                        break;

                }

                put_dev_sector(sect);

                if (minor == -1)

                        return minor;

        } while (1);

        put_dev_sector(sect);

        return first ? 0 : 1;

}

#endif

#ifdef CONFIG_ACORN_PARTITION_ADFS

/*

 * Purpose: allocate ADFS partitions.

 *

 * Params : hd          - pointer to gendisk structure to store partition info.

 *          dev         - device number to access.

 *          first_sector- first readable sector on the device.

 *          minor       - first available minor on device.

 *

 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.

 *

 * Alloc  : hda  = whole drive

 *          hda1 = ADFS partition on first drive.

 *          hda2 = non-ADFS partition.

 */

static int

adfspart_check_ADFS(struct gendisk *hd, struct block_device *bdev,

                   unsigned long first_sector, int minor)

{

        unsigned long start_sect, nr_sects, sectscyl, heads;

        Sector sect;

        unsigned char *data;

        struct adfs_discrecord *dr;

        unsigned char id;

        data = read_dev_sector(bdev, 6, &sect);

        if (!data)

                return -1;

        dr = adfs_partition(hd, "ADFS", data, first_sector, minor++);

        if (!dr) {

                put_dev_sector(sect);

                return 0;

        }

        heads = dr->heads + ((dr->lowsector >> 6) & 1);

        sectscyl = dr->secspertrack * heads;

        start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;

        id = data[0x1fc] & 15;

        put_dev_sector(sect);

        adfspart_setgeometry(to_kdev_t(bdev->bd_dev), dr->secspertrack, heads);

        invalidate_bdev(bdev, 1);

        truncate_inode_pages(bdev->bd_inode->i_mapping, 0);

        /*

         * Work out start of non-adfs partition.

         */

        nr_sects = hd->part[MINOR(to_kdev_t(bdev->bd_dev))].nr_sects - start_sect;

        if (start_sect) {

                first_sector += start_sect;

                switch (id) {

#ifdef CONFIG_ACORN_PARTITION_RISCIX

                case PARTITION_RISCIX_SCSI:

                case PARTITION_RISCIX_MFM:

                        minor = riscix_partition(hd, bdev, first_sector,

                                                 minor, nr_sects);

                        break;

#endif

                case PARTITION_LINUX:

                        minor = linux_partition(hd, bdev, first_sector,

                                                minor, nr_sects);

                        break;

                }

        }

        return 1;

}

#endif

#ifdef CONFIG_ACORN_PARTITION_ICS

static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block)

{

        Sector sect;

        unsigned char *data = read_dev_sector(bdev, block, &sect);

        int result = 0;

        if (data) {

                if (memcmp(data, "LinuxPart", 9) == 0)

                        result = 1;

                put_dev_sector(sect);

        }

        return result;

}

/*

 * Purpose: allocate ICS partitions.

 * Params : hd          - pointer to gendisk structure to store partition info.

 *          dev         - device number to access.

 *          first_sector- first readable sector on the device.

 *          minor       - first available minor on device.

 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.

 * Alloc  : hda  = whole drive

 *          hda1 = ADFS partition 0 on first drive.

 *          hda2 = ADFS partition 1 on first drive.

 *              ..etc..

 */

static int

adfspart_check_ICS(struct gendisk *hd, struct block_device *bdev,

                   unsigned long first_sector, int minor)

{

        Sector sect;

        unsigned char *data;

        unsigned long sum;

        unsigned int i, mask = (1 << hd->minor_shift) - 1;

        struct ics_part *p;

        /*

         * Try ICS style partitions - sector 0 contains partition info.

         */

        data = read_dev_sector(bdev, 0, &sect);

        if (!data)

                return -1;

        /*

         * check for a valid checksum

         */

        for (i = 0, sum = 0x50617274; i < 508; i++)

                sum += data[i];

        sum -= le32_to_cpu(*(__u32 *)(&data[508]));

        if (sum) {

                put_dev_sector(sect);

                return 0; /* not ICS partition table */

        }

        printk(" [ICS]");

        for (p = (struct ics_part *)data; p->size; p++) {

                unsigned long start;

                long size;

                if ((minor & mask) == 0)

                        break;

                start = le32_to_cpu(p->start);

                size  = le32_to_cpu(p->size);

                if (size < 0) {

                        size = -size;

                        /*

                         * We use the first sector to identify what type

                         * this partition is...

                         */

                        if (size > 1 && adfspart_check_ICSLinux(bdev, start)) {

                                start += 1;

                                size -= 1;

                        }

                }

                if (size) {

                        add_gd_partition(hd, minor, first_sector + start, size);

                        minor++;

                }

        }

        put_dev_sector(sect);

        return 1;

}

#endif

/*

 * Purpose: allocate ICS partitions.

 * Params : hd          - pointer to gendisk structure to store partition info.

 *          dev         - device number to access.

 *          first_sector- first readable sector on the device.

 *          minor       - first available minor on device.

 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.

 * Alloc  : hda  = whole drive

 *          hda1 = ADFS partition 0 on first drive.

 *          hda2 = ADFS partition 1 on first drive.

 *              ..etc..

 */

#ifdef CONFIG_ACORN_PARTITION_POWERTEC

static int

adfspart_check_POWERTEC(struct gendisk *hd, struct block_device *bdev,

                        unsigned long first_sector, int minor)

{

        Sector sect;

        unsigned char *data;

        struct ptec_partition *p;

        unsigned char checksum;

        int i;

        data = read_dev_sector(bdev, 0, &sect);

        if (!data)

                return -1;

        for (checksum = 0x2a, i = 0; i < 511; i++)

                checksum += data[i];

        if (checksum != data[511]) {

                put_dev_sector(sect);

                return 0;

        }

        printk(" [POWERTEC]");

        for (i = 0, p = (struct ptec_partition *)data; i < 12; i++, p++) {

                unsigned long start;

                unsigned long size;

                start = le32_to_cpu(p->start);

                size  = le32_to_cpu(p->size);

                if (size)

                        add_gd_partition(hd, minor, first_sector + start,

                                         size);

                minor++;

        }

        put_dev_sector(sect);

        return 1;

}

#endif

static int (*partfn[])(struct gendisk *, struct block_device *, unsigned long, int) = {

#ifdef CONFIG_ACORN_PARTITION_ICS

        adfspart_check_ICS,

#endif

#ifdef CONFIG_ACORN_PARTITION_POWERTEC

        adfspart_check_POWERTEC,

#endif

#ifdef CONFIG_ACORN_PARTITION_CUMANA

        adfspart_check_CUMANA,

#endif

#ifdef CONFIG_ACORN_PARTITION_ADFS

        adfspart_check_ADFS,

#endif

        NULL

};

/*

 * Purpose: initialise all the partitions on an ADFS drive.

 *          These may be other ADFS partitions or a Linux/RiscBSD/RISCiX

 *          partition.

 *

 * Params : hd          - pointer to gendisk structure

 *          dev         - device number to access

 *          first_sect  - first available sector on the disk.

 *          first_minor - first available minor on this device.

 *

 * Returns: -1 on error, 0 if not ADFS format, 1 if ok.

 */

int acorn_partition(struct gendisk *hd, struct block_device *bdev,

                    unsigned long first_sect, int first_minor)

{

        int i;

        for (i = 0; partfn[i]; i++) {

                int r = partfn[i](hd, bdev, first_sect, first_minor);

                if (r) {

                        if (r > 0)

                                printk("\n");

                        return r;

                }

        }

        return 0;

}