// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

/*
 * Support for harddisk partitions.
 *
 * To be compatible with LinuxPPC and Apple we use the standard Apple
 * SCSI disk partitioning scheme. For more information see:
 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
 */

#include <common.h>
#include <command.h>
#include <log.h>
#include <memalign.h>
#include <ide.h>
#include "part_mac.h"
#include <part.h>

#ifdef CONFIG_HAVE_BLOCK_DEVICE

/* stdlib.h causes some compatibility problems; should fixe these! -- wd */
#ifndef __ldiv_t_defined
typedef struct {
        long int quot;          /* Quotient     */
        long int rem;           /* Remainder    */
} ldiv_t;
extern ldiv_t ldiv (long int __numer, long int __denom);
# define __ldiv_t_defined       1
#endif


static int part_mac_read_ddb(struct blk_desc *dev_desc,
                             mac_driver_desc_t *ddb_p);
static int part_mac_read_pdb(struct blk_desc *dev_desc, int part,
                             mac_partition_t *pdb_p);

/*
 * Test for a valid MAC partition
 */
static int part_test_mac(struct blk_desc *dev_desc)
{
        ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
        ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
        ulong i, n;

        if (part_mac_read_ddb (dev_desc, ddesc)) {
                /*
                 * error reading Driver Descriptor Block,
                 * or no valid Signature
                 */
                return (-1);
        }

        n = 1;  /* assuming at least one partition */
        for (i=1; i<=n; ++i) {
                if ((blk_dread(dev_desc, i, 1, (ulong *)mpart) != 1) ||
                    (mpart->signature != MAC_PARTITION_MAGIC) ) {
                        return (-1);
                }
                /* update partition count */
                n = mpart->map_count;
        }
        return (0);
}

static void part_print_mac(struct blk_desc *dev_desc)
{
        ulong i, n;
        ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
        ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
        ldiv_t mb, gb;

        if (part_mac_read_ddb (dev_desc, ddesc)) {
                /*
                 * error reading Driver Descriptor Block,
                 * or no valid Signature
                 */
                return;
        }

        n  = ddesc->blk_count;

        mb = ldiv(n, ((1024 * 1024) / ddesc->blk_size)); /* MB */
        /* round to 1 digit */
        mb.rem *= 10 * ddesc->blk_size;
        mb.rem += 512 * 1024;
        mb.rem /= 1024 * 1024;

        gb = ldiv(10 * mb.quot + mb.rem, 10240);
        gb.rem += 512;
        gb.rem /= 1024;


        printf ("Block Size=%d, Number of Blocks=%d, "
                "Total Capacity: %ld.%ld MB = %ld.%ld GB\n"
                "DeviceType=0x%x, DeviceId=0x%x\n\n"
                "   #:                 type name"
                "                   length   base       (size)\n",
                ddesc->blk_size,
                ddesc->blk_count,
                mb.quot, mb.rem, gb.quot, gb.rem,
                ddesc->dev_type, ddesc->dev_id
                );

        n = 1;  /* assuming at least one partition */
        for (i=1; i<=n; ++i) {
                ulong bytes;
                char c;

                printf ("%4ld: ", i);
                if (blk_dread(dev_desc, i, 1, (ulong *)mpart) != 1) {
                        printf ("** Can't read Partition Map on %d:%ld **\n",
                                dev_desc->devnum, i);
                        return;
                }

                if (mpart->signature != MAC_PARTITION_MAGIC) {
                        printf("** Bad Signature on %d:%ld - expected 0x%04x, got 0x%04x\n",
                               dev_desc->devnum, i, MAC_PARTITION_MAGIC,
                               mpart->signature);
                        return;
                }

                /* update partition count */
                n = mpart->map_count;

                c      = 'k';
                bytes  = mpart->block_count;
                bytes /= (1024 / ddesc->blk_size);  /* kB; assumes blk_size == 512 */
                if (bytes >= 1024) {
                        bytes >>= 10;
                        c = 'M';
                }
                if (bytes >= 1024) {
                        bytes >>= 10;
                        c = 'G';
                }

                printf ("%20.32s %-18.32s %10u @ %-10u (%3ld%c)\n",
                        mpart->type,
                        mpart->name,
                        mpart->block_count,
                        mpart->start_block,
                        bytes, c
                        );
        }

        return;
}


/*
 * Read Device Descriptor Block
 */
static int part_mac_read_ddb(struct blk_desc *dev_desc,
                             mac_driver_desc_t *ddb_p)
{
        if (blk_dread(dev_desc, 0, 1, (ulong *)ddb_p) != 1) {
                debug("** Can't read Driver Descriptor Block **\n");
                return (-1);
        }

        if (ddb_p->signature != MAC_DRIVER_MAGIC) {
                return (-1);
        }
        return (0);
}

/*
 * Read Partition Descriptor Block
 */
static int part_mac_read_pdb(struct blk_desc *dev_desc, int part,
                             mac_partition_t *pdb_p)
{
        int n = 1;

        for (;;) {
                /*
                 * We must always read the descritpor block for
                 * partition 1 first since this is the only way to
                 * know how many partitions we have.
                 */
                if (blk_dread(dev_desc, n, 1, (ulong *)pdb_p) != 1) {
                        printf ("** Can't read Partition Map on %d:%d **\n",
                                dev_desc->devnum, n);
                        return (-1);
                }

                if (pdb_p->signature != MAC_PARTITION_MAGIC) {
                        printf("** Bad Signature on %d:%d: expected 0x%04x, got 0x%04x\n",
                               dev_desc->devnum, n, MAC_PARTITION_MAGIC,
                               pdb_p->signature);
                        return (-1);
                }

                if (n == part)
                        return (0);

                if ((part < 1) || (part > pdb_p->map_count)) {
                        printf ("** Invalid partition %d:%d [%d:1...%d:%d only]\n",
                                dev_desc->devnum, part,
                                dev_desc->devnum,
                                dev_desc->devnum, pdb_p->map_count);
                        return (-1);
                }

                /* update partition count */
                n = part;
        }

        /* NOTREACHED */
}

static int part_get_info_mac(struct blk_desc *dev_desc, int part,
                                  struct disk_partition *info)
{
        ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
        ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);

        if (part_mac_read_ddb (dev_desc, ddesc)) {
                return (-1);
        }

        info->blksz = ddesc->blk_size;

        if (part_mac_read_pdb (dev_desc, part, mpart)) {
                return (-1);
        }

        info->start = mpart->start_block;
        info->size  = mpart->block_count;
        memcpy (info->type, mpart->type, sizeof(info->type));
        memcpy (info->name, mpart->name, sizeof(info->name));

        return (0);
}

U_BOOT_PART_TYPE(mac) = {
        .name           = "MAC",
        .part_type      = PART_TYPE_MAC,
        .max_entries    = MAC_ENTRY_NUMBERS,
        .get_info       = part_get_info_mac,
        .print          = part_print_mac,
        .test           = part_test_mac,
};
#endif