// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000-2011
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#define LOG_CATEGORY UCLASS_IDE

#include <common.h>
#include <ata.h>
#include <blk.h>
#include <dm.h>
#include <ide.h>
#include <log.h>
#include <part.h>
#include <watchdog.h>
#include <asm/io.h>
#include <linux/delay.h>

#ifdef __PPC__
# define EIEIO          __asm__ volatile ("eieio")
# define SYNC           __asm__ volatile ("sync")
#else
# define EIEIO          /* nothing */
# define SYNC           /* nothing */
#endif

/* Current offset for IDE0 / IDE1 bus access    */
ulong ide_bus_offset[CONFIG_SYS_IDE_MAXBUS] = {
#if defined(CONFIG_SYS_ATA_IDE0_OFFSET)
        CONFIG_SYS_ATA_IDE0_OFFSET,
#endif
#if defined(CONFIG_SYS_ATA_IDE1_OFFSET) && (CONFIG_SYS_IDE_MAXBUS > 1)
        CONFIG_SYS_ATA_IDE1_OFFSET,
#endif
};

static int ide_bus_ok[CONFIG_SYS_IDE_MAXBUS];

struct blk_desc ide_dev_desc[CONFIG_SYS_IDE_MAXDEVICE];

#define IDE_TIME_OUT    2000    /* 2 sec timeout */

#define ATAPI_TIME_OUT  7000    /* 7 sec timeout (5 sec seems to work...) */

#define IDE_SPIN_UP_TIME_OUT 5000 /* 5 sec spin-up timeout */

#ifdef CONFIG_IDE_RESET
extern void ide_set_reset(int idereset);

static void ide_reset(void)
{
        int i;

        for (i = 0; i < CONFIG_SYS_IDE_MAXBUS; ++i)
                ide_bus_ok[i] = 0;
        for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i)
                ide_dev_desc[i].type = DEV_TYPE_UNKNOWN;

        ide_set_reset(1);       /* assert reset */

        /* the reset signal shall be asserted for et least 25 us */
        udelay(25);

        WATCHDOG_RESET();

        /* de-assert RESET signal */
        ide_set_reset(0);

        /* wait 250 ms */
        for (i = 0; i < 250; ++i)
                udelay(1000);
}
#else
#define ide_reset()     /* dummy */
#endif /* CONFIG_IDE_RESET */

/*
 * Wait until Busy bit is off, or timeout (in ms)
 * Return last status
 */
static uchar ide_wait(int dev, ulong t)
{
        ulong delay = 10 * t;   /* poll every 100 us */
        uchar c;

        while ((c = ide_inb(dev, ATA_STATUS)) & ATA_STAT_BUSY) {
                udelay(100);
                if (delay-- == 0)
                        break;
        }
        return c;
}

/*
 * copy src to dest, skipping leading and trailing blanks and null
 * terminate the string
 * "len" is the size of available memory including the terminating '\0'
 */
static void ident_cpy(unsigned char *dst, unsigned char *src,
                      unsigned int len)
{
        unsigned char *end, *last;

        last = dst;
        end = src + len - 1;

        /* reserve space for '\0' */
        if (len < 2)
                goto OUT;

        /* skip leading white space */
        while ((*src) && (src < end) && (*src == ' '))
                ++src;

        /* copy string, omitting trailing white space */
        while ((*src) && (src < end)) {
                *dst++ = *src;
                if (*src++ != ' ')
                        last = dst;
        }
OUT:
        *last = '\0';
}

#ifdef CONFIG_ATAPI
/****************************************************************************
 * ATAPI Support
 */

/* since ATAPI may use commands with not 4 bytes alligned length
 * we have our own transfer functions, 2 bytes alligned */
__weak void ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
{
        uintptr_t paddr = (ATA_CURR_BASE(dev) + ATA_DATA_REG);
        ushort *dbuf;

        dbuf = (ushort *)sect_buf;

        debug("in output data shorts base for read is %p\n", (void *)paddr);

        while (shorts--) {
                EIEIO;
                outw(cpu_to_le16(*dbuf++), paddr);
        }
}

__weak void ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
{
        uintptr_t paddr = (ATA_CURR_BASE(dev) + ATA_DATA_REG);
        ushort *dbuf;

        dbuf = (ushort *)sect_buf;

        debug("in input data shorts base for read is %p\n", (void *)paddr);

        while (shorts--) {
                EIEIO;
                *dbuf++ = le16_to_cpu(inw(paddr));
        }
}

/*
 * Wait until (Status & mask) == res, or timeout (in ms)
 * Return last status
 * This is used since some ATAPI CD ROMs clears their Busy Bit first
 * and then they set their DRQ Bit
 */
static uchar atapi_wait_mask(int dev, ulong t, uchar mask, uchar res)
{
        ulong delay = 10 * t;   /* poll every 100 us */
        uchar c;

        /* prevents to read the status before valid */
        c = ide_inb(dev, ATA_DEV_CTL);

        while (((c = ide_inb(dev, ATA_STATUS)) & mask) != res) {
                /* break if error occurs (doesn't make sense to wait more) */
                if ((c & ATA_STAT_ERR) == ATA_STAT_ERR)
                        break;
                udelay(100);
                if (delay-- == 0)
                        break;
        }
        return c;
}

/*
 * issue an atapi command
 */
unsigned char atapi_issue(int device, unsigned char *ccb, int ccblen,
                          unsigned char *buffer, int buflen)
{
        unsigned char c, err, mask, res;
        int n;

        /* Select device
         */
        mask = ATA_STAT_BUSY | ATA_STAT_DRQ;
        res = 0;
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
        c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
        if ((c & mask) != res) {
                printf("ATAPI_ISSUE: device %d not ready status %X\n", device,
                       c);
                err = 0xFF;
                goto AI_OUT;
        }
        /* write taskfile */
        ide_outb(device, ATA_ERROR_REG, 0);     /* no DMA, no overlaped */
        ide_outb(device, ATA_SECT_CNT, 0);
        ide_outb(device, ATA_SECT_NUM, 0);
        ide_outb(device, ATA_CYL_LOW, (unsigned char) (buflen & 0xFF));
        ide_outb(device, ATA_CYL_HIGH,
                 (unsigned char) ((buflen >> 8) & 0xFF));
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

        ide_outb(device, ATA_COMMAND, ATA_CMD_PACKET);
        udelay(50);

        mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
        res = ATA_STAT_DRQ;
        c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);

        if ((c & mask) != res) {        /* DRQ must be 1, BSY 0 */
                printf("ATAPI_ISSUE: Error (no IRQ) before sending ccb dev %d status 0x%02x\n",
                       device, c);
                err = 0xFF;
                goto AI_OUT;
        }

        /* write command block */
        ide_output_data_shorts(device, (unsigned short *)ccb, ccblen / 2);

        /* ATAPI Command written wait for completition */
        udelay(5000);           /* device must set bsy */

        mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
        /*
         * if no data wait for DRQ = 0 BSY = 0
         * if data wait for DRQ = 1 BSY = 0
         */
        res = 0;
        if (buflen)
                res = ATA_STAT_DRQ;
        c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
        if ((c & mask) != res) {
                if (c & ATA_STAT_ERR) {
                        err = (ide_inb(device, ATA_ERROR_REG)) >> 4;
                        debug("atapi_issue 1 returned sense key %X status %02X\n",
                              err, c);
                } else {
                        printf("ATAPI_ISSUE: (no DRQ) after sending ccb (%x)  status 0x%02x\n",
                               ccb[0], c);
                        err = 0xFF;
                }
                goto AI_OUT;
        }
        n = ide_inb(device, ATA_CYL_HIGH);
        n <<= 8;
        n += ide_inb(device, ATA_CYL_LOW);
        if (n > buflen) {
                printf("ERROR, transfer bytes %d requested only %d\n", n,
                       buflen);
                err = 0xff;
                goto AI_OUT;
        }
        if ((n == 0) && (buflen < 0)) {
                printf("ERROR, transfer bytes %d requested %d\n", n, buflen);
                err = 0xff;
                goto AI_OUT;
        }
        if (n != buflen) {
                debug("WARNING, transfer bytes %d not equal with requested %d\n",
                      n, buflen);
        }
        if (n != 0) {           /* data transfer */
                debug("ATAPI_ISSUE: %d Bytes to transfer\n", n);
                /* we transfer shorts */
                n >>= 1;
                /* ok now decide if it is an in or output */
                if ((ide_inb(device, ATA_SECT_CNT) & 0x02) == 0) {
                        debug("Write to device\n");
                        ide_output_data_shorts(device, (unsigned short *)buffer,
                                               n);
                } else {
                        debug("Read from device @ %p shorts %d\n", buffer, n);
                        ide_input_data_shorts(device, (unsigned short *)buffer,
                                              n);
                }
        }
        udelay(5000);           /* seems that some CD ROMs need this... */
        mask = ATA_STAT_BUSY | ATA_STAT_ERR;
        res = 0;
        c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
        if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
                err = (ide_inb(device, ATA_ERROR_REG) >> 4);
                debug("atapi_issue 2 returned sense key %X status %X\n", err,
                      c);
        } else {
                err = 0;
        }
AI_OUT:
        return err;
}

/*
 * sending the command to atapi_issue. If an status other than good
 * returns, an request_sense will be issued
 */

#define ATAPI_DRIVE_NOT_READY   100
#define ATAPI_UNIT_ATTN         10

unsigned char atapi_issue_autoreq(int device,
                                  unsigned char *ccb,
                                  int ccblen,
                                  unsigned char *buffer, int buflen)
{
        unsigned char sense_data[18], sense_ccb[12];
        unsigned char res, key, asc, ascq;
        int notready, unitattn;

        unitattn = ATAPI_UNIT_ATTN;
        notready = ATAPI_DRIVE_NOT_READY;

retry:
        res = atapi_issue(device, ccb, ccblen, buffer, buflen);
        if (res == 0)
                return 0;       /* Ok */

        if (res == 0xFF)
                return 0xFF;    /* error */

        debug("(auto_req)atapi_issue returned sense key %X\n", res);

        memset(sense_ccb, 0, sizeof(sense_ccb));
        memset(sense_data, 0, sizeof(sense_data));
        sense_ccb[0] = ATAPI_CMD_REQ_SENSE;
        sense_ccb[4] = 18;      /* allocation Length */

        res = atapi_issue(device, sense_ccb, 12, sense_data, 18);
        key = (sense_data[2] & 0xF);
        asc = (sense_data[12]);
        ascq = (sense_data[13]);

        debug("ATAPI_CMD_REQ_SENSE returned %x\n", res);
        debug(" Sense page: %02X key %02X ASC %02X ASCQ %02X\n",
              sense_data[0], key, asc, ascq);

        if ((key == 0))
                return 0;       /* ok device ready */

        if ((key == 6) || (asc == 0x29) || (asc == 0x28)) { /* Unit Attention */
                if (unitattn-- > 0) {
                        udelay(200 * 1000);
                        goto retry;
                }
                printf("Unit Attention, tried %d\n", ATAPI_UNIT_ATTN);
                goto error;
        }
        if ((asc == 0x4) && (ascq == 0x1)) {
                /* not ready, but will be ready soon */
                if (notready-- > 0) {
                        udelay(200 * 1000);
                        goto retry;
                }
                printf("Drive not ready, tried %d times\n",
                       ATAPI_DRIVE_NOT_READY);
                goto error;
        }
        if (asc == 0x3a) {
                debug("Media not present\n");
                goto error;
        }

        printf("ERROR: Unknown Sense key %02X ASC %02X ASCQ %02X\n", key, asc,
               ascq);
error:
        debug("ERROR Sense key %02X ASC %02X ASCQ %02X\n", key, asc, ascq);
        return 0xFF;
}

/*
 * atapi_read:
 * we transfer only one block per command, since the multiple DRQ per
 * command is not yet implemented
 */
#define ATAPI_READ_MAX_BYTES    2048    /* we read max 2kbytes */
#define ATAPI_READ_BLOCK_SIZE   2048    /* assuming CD part */
#define ATAPI_READ_MAX_BLOCK    (ATAPI_READ_MAX_BYTES/ATAPI_READ_BLOCK_SIZE)

ulong atapi_read(struct blk_desc *block_dev, lbaint_t blknr, lbaint_t blkcnt,
                 void *buffer)
{
        int device = block_dev->devnum;
        ulong n = 0;
        unsigned char ccb[12];  /* Command descriptor block */
        ulong cnt;

        debug("atapi_read dev %d start " LBAF " blocks " LBAF
              " buffer at %lX\n", device, blknr, blkcnt, (ulong) buffer);

        do {
                if (blkcnt > ATAPI_READ_MAX_BLOCK)
                        cnt = ATAPI_READ_MAX_BLOCK;
                else
                        cnt = blkcnt;

                ccb[0] = ATAPI_CMD_READ_12;
                ccb[1] = 0;     /* reserved */
                ccb[2] = (unsigned char) (blknr >> 24) & 0xFF;  /* MSB Block */
                ccb[3] = (unsigned char) (blknr >> 16) & 0xFF;  /*  */
                ccb[4] = (unsigned char) (blknr >> 8) & 0xFF;
                ccb[5] = (unsigned char) blknr & 0xFF;  /* LSB Block */
                ccb[6] = (unsigned char) (cnt >> 24) & 0xFF; /* MSB Block cnt */
                ccb[7] = (unsigned char) (cnt >> 16) & 0xFF;
                ccb[8] = (unsigned char) (cnt >> 8) & 0xFF;
                ccb[9] = (unsigned char) cnt & 0xFF;    /* LSB Block */
                ccb[10] = 0;    /* reserved */
                ccb[11] = 0;    /* reserved */

                if (atapi_issue_autoreq(device, ccb, 12,
                                        (unsigned char *)buffer,
                                        cnt * ATAPI_READ_BLOCK_SIZE)
                    == 0xFF) {
                        return n;
                }
                n += cnt;
                blkcnt -= cnt;
                blknr += cnt;
                buffer += (cnt * ATAPI_READ_BLOCK_SIZE);
        } while (blkcnt > 0);
        return n;
}

static void atapi_inquiry(struct blk_desc *dev_desc)
{
        unsigned char ccb[12];  /* Command descriptor block */
        unsigned char iobuf[64];        /* temp buf */
        unsigned char c;
        int device;

        device = dev_desc->devnum;
        dev_desc->type = DEV_TYPE_UNKNOWN;      /* not yet valid */
#ifndef CONFIG_BLK
        dev_desc->block_read = atapi_read;
#endif

        memset(ccb, 0, sizeof(ccb));
        memset(iobuf, 0, sizeof(iobuf));

        ccb[0] = ATAPI_CMD_INQUIRY;
        ccb[4] = 40;            /* allocation Legnth */
        c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *)iobuf, 40);

        debug("ATAPI_CMD_INQUIRY returned %x\n", c);
        if (c != 0)
                return;

        /* copy device ident strings */
        ident_cpy((unsigned char *)dev_desc->vendor, &iobuf[8], 8);
        ident_cpy((unsigned char *)dev_desc->product, &iobuf[16], 16);
        ident_cpy((unsigned char *)dev_desc->revision, &iobuf[32], 5);

        dev_desc->lun = 0;
        dev_desc->lba = 0;
        dev_desc->blksz = 0;
        dev_desc->log2blksz = LOG2_INVALID(typeof(dev_desc->log2blksz));
        dev_desc->type = iobuf[0] & 0x1f;

        if ((iobuf[1] & 0x80) == 0x80)
                dev_desc->removable = 1;
        else
                dev_desc->removable = 0;

        memset(ccb, 0, sizeof(ccb));
        memset(iobuf, 0, sizeof(iobuf));
        ccb[0] = ATAPI_CMD_START_STOP;
        ccb[4] = 0x03;          /* start */

        c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *)iobuf, 0);

        debug("ATAPI_CMD_START_STOP returned %x\n", c);
        if (c != 0)
                return;

        memset(ccb, 0, sizeof(ccb));
        memset(iobuf, 0, sizeof(iobuf));
        c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *)iobuf, 0);

        debug("ATAPI_CMD_UNIT_TEST_READY returned %x\n", c);
        if (c != 0)
                return;

        memset(ccb, 0, sizeof(ccb));
        memset(iobuf, 0, sizeof(iobuf));
        ccb[0] = ATAPI_CMD_READ_CAP;
        c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *)iobuf, 8);
        debug("ATAPI_CMD_READ_CAP returned %x\n", c);
        if (c != 0)
                return;

        debug("Read Cap: LBA %02X%02X%02X%02X blksize %02X%02X%02X%02X\n",
              iobuf[0], iobuf[1], iobuf[2], iobuf[3],
              iobuf[4], iobuf[5], iobuf[6], iobuf[7]);

        dev_desc->lba = ((unsigned long) iobuf[0] << 24) +
                ((unsigned long) iobuf[1] << 16) +
                ((unsigned long) iobuf[2] << 8) + ((unsigned long) iobuf[3]);
        dev_desc->blksz = ((unsigned long) iobuf[4] << 24) +
                ((unsigned long) iobuf[5] << 16) +
                ((unsigned long) iobuf[6] << 8) + ((unsigned long) iobuf[7]);
        dev_desc->log2blksz = LOG2(dev_desc->blksz);
#ifdef CONFIG_LBA48
        /* ATAPI devices cannot use 48bit addressing (ATA/ATAPI v7) */
        dev_desc->lba48 = 0;
#endif
        return;
}

#endif /* CONFIG_ATAPI */

static void ide_ident(struct blk_desc *dev_desc)
{
        unsigned char c;
        hd_driveid_t iop;

#ifdef CONFIG_ATAPI
        int retries = 0;
#endif
        int device;

        device = dev_desc->devnum;
        printf("  Device %d: ", device);

        /* Select device
         */
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
        dev_desc->if_type = IF_TYPE_IDE;
#ifdef CONFIG_ATAPI

        retries = 0;

        /* Warning: This will be tricky to read */
        while (retries <= 1) {
                /* check signature */
                if ((ide_inb(device, ATA_SECT_CNT) == 0x01) &&
                    (ide_inb(device, ATA_SECT_NUM) == 0x01) &&
                    (ide_inb(device, ATA_CYL_LOW) == 0x14) &&
                    (ide_inb(device, ATA_CYL_HIGH) == 0xEB)) {
                        /* ATAPI Signature found */
                        dev_desc->if_type = IF_TYPE_ATAPI;
                        /*
                         * Start Ident Command
                         */
                        ide_outb(device, ATA_COMMAND, ATA_CMD_ID_ATAPI);
                        /*
                         * Wait for completion - ATAPI devices need more time
                         * to become ready
                         */
                        c = ide_wait(device, ATAPI_TIME_OUT);
                } else
#endif
                {
                        /*
                         * Start Ident Command
                         */
                        ide_outb(device, ATA_COMMAND, ATA_CMD_ID_ATA);

                        /*
                         * Wait for completion
                         */
                        c = ide_wait(device, IDE_TIME_OUT);
                }

                if (((c & ATA_STAT_DRQ) == 0) ||
                    ((c & (ATA_STAT_FAULT | ATA_STAT_ERR)) != 0)) {
#ifdef CONFIG_ATAPI
                        {
                                /*
                                 * Need to soft reset the device
                                 * in case it's an ATAPI...
                                 */
                                debug("Retrying...\n");
                                ide_outb(device, ATA_DEV_HD,
                                         ATA_LBA | ATA_DEVICE(device));
                                udelay(100000);
                                ide_outb(device, ATA_COMMAND, 0x08);
                                udelay(500000); /* 500 ms */
                        }
                        /*
                         * Select device
                         */
                        ide_outb(device, ATA_DEV_HD,
                                 ATA_LBA | ATA_DEVICE(device));
                        retries++;
#else
                        return;
#endif
                }
#ifdef CONFIG_ATAPI
                else
                        break;
        }                       /* see above - ugly to read */

        if (retries == 2)       /* Not found */
                return;
#endif

        ide_input_swap_data(device, (ulong *)&iop, ATA_SECTORWORDS);

        ident_cpy((unsigned char *)dev_desc->revision, iop.fw_rev,
                  sizeof(dev_desc->revision));
        ident_cpy((unsigned char *)dev_desc->vendor, iop.model,
                  sizeof(dev_desc->vendor));
        ident_cpy((unsigned char *)dev_desc->product, iop.serial_no,
                  sizeof(dev_desc->product));

        if ((iop.config & 0x0080) == 0x0080)
                dev_desc->removable = 1;
        else
                dev_desc->removable = 0;

#ifdef CONFIG_ATAPI
        if (dev_desc->if_type == IF_TYPE_ATAPI) {
                atapi_inquiry(dev_desc);
                return;
        }
#endif /* CONFIG_ATAPI */

        iop.lba_capacity[0] = be16_to_cpu(iop.lba_capacity[0]);
        iop.lba_capacity[1] = be16_to_cpu(iop.lba_capacity[1]);
        dev_desc->lba =
                        ((unsigned long)iop.lba_capacity[0]) |
                        ((unsigned long)iop.lba_capacity[1] << 16);

#ifdef CONFIG_LBA48
        if (iop.command_set_2 & 0x0400) {       /* LBA 48 support */
                dev_desc->lba48 = 1;
                for (int i = 0; i < 4; i++)
                        iop.lba48_capacity[i] = be16_to_cpu(iop.lba48_capacity[i]);
                dev_desc->lba =
                        ((unsigned long long)iop.lba48_capacity[0] |
                        ((unsigned long long)iop.lba48_capacity[1] << 16) |
                        ((unsigned long long)iop.lba48_capacity[2] << 32) |
                        ((unsigned long long)iop.lba48_capacity[3] << 48));
        } else {
                dev_desc->lba48 = 0;
        }
#endif /* CONFIG_LBA48 */
        /* assuming HD */
        dev_desc->type = DEV_TYPE_HARDDISK;
        dev_desc->blksz = ATA_BLOCKSIZE;
        dev_desc->log2blksz = LOG2(dev_desc->blksz);
        dev_desc->lun = 0;      /* just to fill something in... */

#if 0                           /* only used to test the powersaving mode,
                                 * if enabled, the drive goes after 5 sec
                                 * in standby mode */
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
        c = ide_wait(device, IDE_TIME_OUT);
        ide_outb(device, ATA_SECT_CNT, 1);
        ide_outb(device, ATA_LBA_LOW, 0);
        ide_outb(device, ATA_LBA_MID, 0);
        ide_outb(device, ATA_LBA_HIGH, 0);
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
        ide_outb(device, ATA_COMMAND, 0xe3);
        udelay(50);
        c = ide_wait(device, IDE_TIME_OUT);     /* can't take over 500 ms */
#endif
}

__weak void ide_outb(int dev, int port, unsigned char val)
{
        debug("ide_outb (dev= %d, port= 0x%x, val= 0x%02x) : @ 0x%08lx\n",
              dev, port, val, ATA_CURR_BASE(dev) + port);

        outb(val, ATA_CURR_BASE(dev) + port);
}

__weak unsigned char ide_inb(int dev, int port)
{
        uchar val;

        val = inb(ATA_CURR_BASE(dev) + port);

        debug("ide_inb (dev= %d, port= 0x%x) : @ 0x%08lx -> 0x%02x\n",
              dev, port, ATA_CURR_BASE(dev) + port, val);
        return val;
}

void ide_init(void)
{
        unsigned char c;
        int i, bus;

#ifdef CONFIG_IDE_PREINIT
        WATCHDOG_RESET();

        if (ide_preinit()) {
                puts("ide_preinit failed\n");
                return;
        }
#endif /* CONFIG_IDE_PREINIT */

        WATCHDOG_RESET();

        /* ATAPI Drives seems to need a proper IDE Reset */
        ide_reset();

        /*
         * Wait for IDE to get ready.
         * According to spec, this can take up to 31 seconds!
         */
        for (bus = 0; bus < CONFIG_SYS_IDE_MAXBUS; ++bus) {
                int dev =
                        bus * (CONFIG_SYS_IDE_MAXDEVICE /
                               CONFIG_SYS_IDE_MAXBUS);

                printf("Bus %d: ", bus);

                ide_bus_ok[bus] = 0;

                /* Select device
                 */
                udelay(100000); /* 100 ms */
                ide_outb(dev, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(dev));
                udelay(100000); /* 100 ms */
                i = 0;
                do {
                        udelay(10000);  /* 10 ms */

                        c = ide_inb(dev, ATA_STATUS);
                        i++;
                        if (i > (ATA_RESET_TIME * 100)) {
                                puts("** Timeout **\n");
                                return;
                        }
                        if ((i >= 100) && ((i % 100) == 0))
                                putc('.');

                } while (c & ATA_STAT_BUSY);

                if (c & (ATA_STAT_BUSY | ATA_STAT_FAULT)) {
                        puts("not available  ");
                        debug("Status = 0x%02X ", c);
#ifndef CONFIG_ATAPI            /* ATAPI Devices do not set DRDY */
                } else if ((c & ATA_STAT_READY) == 0) {
                        puts("not available  ");
                        debug("Status = 0x%02X ", c);
#endif
                } else {
                        puts("OK ");
                        ide_bus_ok[bus] = 1;
                }
                WATCHDOG_RESET();
        }

        putc('\n');

        for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i) {
                ide_dev_desc[i].type = DEV_TYPE_UNKNOWN;
                ide_dev_desc[i].if_type = IF_TYPE_IDE;
                ide_dev_desc[i].devnum = i;
                ide_dev_desc[i].part_type = PART_TYPE_UNKNOWN;
                ide_dev_desc[i].blksz = 0;
                ide_dev_desc[i].log2blksz =
                        LOG2_INVALID(typeof(ide_dev_desc[i].log2blksz));
                ide_dev_desc[i].lba = 0;
#ifndef CONFIG_BLK
                ide_dev_desc[i].block_read = ide_read;
                ide_dev_desc[i].block_write = ide_write;
#endif
                if (!ide_bus_ok[IDE_BUS(i)])
                        continue;
                ide_ident(&ide_dev_desc[i]);
                dev_print(&ide_dev_desc[i]);

#ifndef CONFIG_BLK
                if ((ide_dev_desc[i].lba > 0) && (ide_dev_desc[i].blksz > 0)) {
                        /* initialize partition type */
                        part_init(&ide_dev_desc[i]);
                }
#endif
        }
        WATCHDOG_RESET();

#ifdef CONFIG_BLK
        struct udevice *dev;

        uclass_first_device(UCLASS_IDE, &dev);
#endif
}

__weak void ide_input_swap_data(int dev, ulong *sect_buf, int words)
{
        uintptr_t paddr = (ATA_CURR_BASE(dev) + ATA_DATA_REG);
        ushort *dbuf = (ushort *)sect_buf;

        debug("in input swap data base for read is %p\n", (void *)paddr);

        while (words--) {
                EIEIO;
                *dbuf++ = be16_to_cpu(inw(paddr));
                EIEIO;
                *dbuf++ = be16_to_cpu(inw(paddr));
        }
}

__weak void ide_output_data(int dev, const ulong *sect_buf, int words)
{
        uintptr_t paddr = (ATA_CURR_BASE(dev) + ATA_DATA_REG);
        ushort *dbuf;

        dbuf = (ushort *)sect_buf;
        while (words--) {
                EIEIO;
                outw(cpu_to_le16(*dbuf++), paddr);
                EIEIO;
                outw(cpu_to_le16(*dbuf++), paddr);
        }
}

__weak void ide_input_data(int dev, ulong *sect_buf, int words)
{
        uintptr_t paddr = (ATA_CURR_BASE(dev) + ATA_DATA_REG);
        ushort *dbuf;

        dbuf = (ushort *)sect_buf;

        debug("in input data base for read is %p\n", (void *)paddr);

        while (words--) {
                EIEIO;
                *dbuf++ = le16_to_cpu(inw(paddr));
                EIEIO;
                *dbuf++ = le16_to_cpu(inw(paddr));
        }
}

#ifdef CONFIG_BLK
ulong ide_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
               void *buffer)
#else
ulong ide_read(struct blk_desc *block_dev, lbaint_t blknr, lbaint_t blkcnt,
               void *buffer)
#endif
{
#ifdef CONFIG_BLK
        struct blk_desc *block_dev = dev_get_uclass_plat(dev);
#endif
        int device = block_dev->devnum;
        ulong n = 0;
        unsigned char c;
        unsigned char pwrsave = 0;      /* power save */

#ifdef CONFIG_LBA48
        unsigned char lba48 = 0;

        if (blknr & 0x0000fffff0000000ULL) {
                /* more than 28 bits used, use 48bit mode */
                lba48 = 1;
        }
#endif
        debug("ide_read dev %d start " LBAF ", blocks " LBAF " buffer at %lX\n",
              device, blknr, blkcnt, (ulong) buffer);

        /* Select device
         */
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
        c = ide_wait(device, IDE_TIME_OUT);

        if (c & ATA_STAT_BUSY) {
                printf("IDE read: device %d not ready\n", device);
                goto IDE_READ_E;
        }

        /* first check if the drive is in Powersaving mode, if yes,
         * increase the timeout value */
        ide_outb(device, ATA_COMMAND, ATA_CMD_CHK_POWER);
        udelay(50);

        c = ide_wait(device, IDE_TIME_OUT);     /* can't take over 500 ms */

        if (c & ATA_STAT_BUSY) {
                printf("IDE read: device %d not ready\n", device);
                goto IDE_READ_E;
        }
        if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
                printf("No Powersaving mode %X\n", c);
        } else {
                c = ide_inb(device, ATA_SECT_CNT);
                debug("Powersaving %02X\n", c);
                if (c == 0)
                        pwrsave = 1;
        }


        while (blkcnt-- > 0) {
                c = ide_wait(device, IDE_TIME_OUT);

                if (c & ATA_STAT_BUSY) {
                        printf("IDE read: device %d not ready\n", device);
                        break;
                }
#ifdef CONFIG_LBA48
                if (lba48) {
                        /* write high bits */
                        ide_outb(device, ATA_SECT_CNT, 0);
                        ide_outb(device, ATA_LBA_LOW, (blknr >> 24) & 0xFF);
#ifdef CONFIG_SYS_64BIT_LBA
                        ide_outb(device, ATA_LBA_MID, (blknr >> 32) & 0xFF);
                        ide_outb(device, ATA_LBA_HIGH, (blknr >> 40) & 0xFF);
#else
                        ide_outb(device, ATA_LBA_MID, 0);
                        ide_outb(device, ATA_LBA_HIGH, 0);
#endif
                }
#endif
                ide_outb(device, ATA_SECT_CNT, 1);
                ide_outb(device, ATA_LBA_LOW, (blknr >> 0) & 0xFF);
                ide_outb(device, ATA_LBA_MID, (blknr >> 8) & 0xFF);
                ide_outb(device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);

#ifdef CONFIG_LBA48
                if (lba48) {
                        ide_outb(device, ATA_DEV_HD,
                                 ATA_LBA | ATA_DEVICE(device));
                        ide_outb(device, ATA_COMMAND, ATA_CMD_PIO_READ_EXT);

                } else
#endif
                {
                        ide_outb(device, ATA_DEV_HD, ATA_LBA |
                                 ATA_DEVICE(device) | ((blknr >> 24) & 0xF));
                        ide_outb(device, ATA_COMMAND, ATA_CMD_PIO_READ);
                }

                udelay(50);

                if (pwrsave) {
                        /* may take up to 4 sec */
                        c = ide_wait(device, IDE_SPIN_UP_TIME_OUT);
                        pwrsave = 0;
                } else {
                        /* can't take over 500 ms */
                        c = ide_wait(device, IDE_TIME_OUT);
                }

                if ((c & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR)) !=
                    ATA_STAT_DRQ) {
                        printf("Error (no IRQ) dev %d blk " LBAF
                               ": status %#02x\n", device, blknr, c);
                        break;
                }

                ide_input_data(device, buffer, ATA_SECTORWORDS);
                (void) ide_inb(device, ATA_STATUS);     /* clear IRQ */

                ++n;
                ++blknr;
                buffer += ATA_BLOCKSIZE;
        }
IDE_READ_E:
        return n;
}

#ifdef CONFIG_BLK
ulong ide_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
                const void *buffer)
#else
ulong ide_write(struct blk_desc *block_dev, lbaint_t blknr, lbaint_t blkcnt,
                const void *buffer)
#endif
{
#ifdef CONFIG_BLK
        struct blk_desc *block_dev = dev_get_uclass_plat(dev);
#endif
        int device = block_dev->devnum;
        ulong n = 0;
        unsigned char c;

#ifdef CONFIG_LBA48
        unsigned char lba48 = 0;

        if (blknr & 0x0000fffff0000000ULL) {
                /* more than 28 bits used, use 48bit mode */
                lba48 = 1;
        }
#endif

        /* Select device
         */
        ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

        while (blkcnt-- > 0) {
                c = ide_wait(device, IDE_TIME_OUT);

                if (c & ATA_STAT_BUSY) {

                        printf("IDE read: device %d not ready\n", device);
                        goto WR_OUT;
                }
#ifdef CONFIG_LBA48
                if (lba48) {
                        /* write high bits */
                        ide_outb(device, ATA_SECT_CNT, 0);
                        ide_outb(device, ATA_LBA_LOW, (blknr >> 24) & 0xFF);
#ifdef CONFIG_SYS_64BIT_LBA
                        ide_outb(device, ATA_LBA_MID, (blknr >> 32) & 0xFF);
                        ide_outb(device, ATA_LBA_HIGH, (blknr >> 40) & 0xFF);
#else
                        ide_outb(device, ATA_LBA_MID, 0);
                        ide_outb(device, ATA_LBA_HIGH, 0);
#endif
                }
#endif
                ide_outb(device, ATA_SECT_CNT, 1);
                ide_outb(device, ATA_LBA_LOW, (blknr >> 0) & 0xFF);
                ide_outb(device, ATA_LBA_MID, (blknr >> 8) & 0xFF);
                ide_outb(device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);

#ifdef CONFIG_LBA48
                if (lba48) {
                        ide_outb(device, ATA_DEV_HD,
                                 ATA_LBA | ATA_DEVICE(device));
                        ide_outb(device, ATA_COMMAND, ATA_CMD_PIO_WRITE_EXT);

                } else
#endif
                {
                        ide_outb(device, ATA_DEV_HD, ATA_LBA |
                                 ATA_DEVICE(device) | ((blknr >> 24) & 0xF));
                        ide_outb(device, ATA_COMMAND, ATA_CMD_PIO_WRITE);
                }

                udelay(50);

                /* can't take over 500 ms */
                c = ide_wait(device, IDE_TIME_OUT);

                if ((c & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR)) !=
                    ATA_STAT_DRQ) {
                        printf("Error (no IRQ) dev %d blk " LBAF
                               ": status %#02x\n", device, blknr, c);
                        goto WR_OUT;
                }

                ide_output_data(device, buffer, ATA_SECTORWORDS);
                c = ide_inb(device, ATA_STATUS);        /* clear IRQ */
                ++n;
                ++blknr;
                buffer += ATA_BLOCKSIZE;
        }
WR_OUT:
        return n;
}

#if defined(CONFIG_OF_IDE_FIXUP)
int ide_device_present(int dev)
{
        if (dev >= CONFIG_SYS_IDE_MAXBUS)
                return 0;
        return ide_dev_desc[dev].type == DEV_TYPE_UNKNOWN ? 0 : 1;
}
#endif

#ifdef CONFIG_BLK
static int ide_blk_probe(struct udevice *udev)
{
        struct blk_desc *desc = dev_get_uclass_plat(udev);

        /* fill in device vendor/product/rev strings */
        strncpy(desc->vendor, ide_dev_desc[desc->devnum].vendor,
                BLK_VEN_SIZE);
        desc->vendor[BLK_VEN_SIZE] = '\0';
        strncpy(desc->product, ide_dev_desc[desc->devnum].product,
                BLK_PRD_SIZE);
        desc->product[BLK_PRD_SIZE] = '\0';
        strncpy(desc->revision, ide_dev_desc[desc->devnum].revision,
                BLK_REV_SIZE);
        desc->revision[BLK_REV_SIZE] = '\0';

        return 0;
}

static const struct blk_ops ide_blk_ops = {
        .read   = ide_read,
        .write  = ide_write,
};

U_BOOT_DRIVER(ide_blk) = {
        .name           = "ide_blk",
        .id             = UCLASS_BLK,
        .ops            = &ide_blk_ops,
        .probe          = ide_blk_probe,
};

static int ide_probe(struct udevice *udev)
{
        struct udevice *blk_dev;
        char name[20];
        int blksz;
        lbaint_t size;
        int i;
        int ret;

        for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; i++) {
                if (ide_dev_desc[i].type != DEV_TYPE_UNKNOWN) {
                        sprintf(name, "blk#%d", i);

                        blksz = ide_dev_desc[i].blksz;
                        size = blksz * ide_dev_desc[i].lba;

                        /*
                         * With CDROM, if there is no CD inserted, blksz will
                         * be zero, don't bother to create IDE block device.
                         */
                        if (!blksz)
                                continue;
                        ret = blk_create_devicef(udev, "ide_blk", name,
                                                 IF_TYPE_IDE, i,
                                                 blksz, size, &blk_dev);
                        if (ret)
                                return ret;
                }
        }

        return 0;
}

U_BOOT_DRIVER(ide) = {
        .name           = "ide",
        .id             = UCLASS_IDE,
        .probe          = ide_probe,
};

struct pci_device_id ide_supported[] = {
        { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_IDE << 8, 0xffff00) },
        { }
};

U_BOOT_PCI_DEVICE(ide, ide_supported);

UCLASS_DRIVER(ide) = {
        .name           = "ide",
        .id             = UCLASS_IDE,
};
#else
U_BOOT_LEGACY_BLK(ide) = {
        .if_typename    = "ide",
        .if_type        = IF_TYPE_IDE,
        .max_devs       = CONFIG_SYS_IDE_MAXDEVICE,
        .desc           = ide_dev_desc,
};
#endif