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//==========================================================================

//

//      ide.c

//

//      RedBoot IDE support

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

// Copyright (C) 2003 Gary Thomas <gary@mind.be>

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: msalter

// Date:         2001-07-14

// Purpose:      

// Description:  

//              

// This code is part of RedBoot (tm).

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <redboot.h>

#include <cyg/hal/hal_io.h>

#include <fs/disk.h>

#include <fs/ide.h>

static int ide_read(struct disk *d,

                    cyg_uint32 start_sector,

                    cyg_uint32 *buf,

                    cyg_uint8  nr_sectors);

static disk_funs_t ide_funs = { ide_read };

static struct ide_priv ide_privs[HAL_IDE_NUM_CONTROLLERS * 2];

static inline void

__wait_for_ready(int ctlr)

{

    cyg_uint8 status;

    do {

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

    } while (status & (IDE_STAT_BSY | IDE_STAT_DRQ));

}

static inline int

__wait_for_drq(int ctlr)

{

    cyg_uint8 status;

    CYGACC_CALL_IF_DELAY_US(10);

    do {

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

        if (status & IDE_STAT_DRQ)

            return 1;

    } while (status & IDE_STAT_BSY);

    return 0;

}

static int

ide_reset(int ctlr)

{

    cyg_uint8 status;

    int delay;

    HAL_IDE_WRITE_CONTROL(ctlr, 6);     // polled mode, reset asserted

    CYGACC_CALL_IF_DELAY_US(5000);

    HAL_IDE_WRITE_CONTROL(ctlr, 2);     // polled mode, reset cleared

    CYGACC_CALL_IF_DELAY_US((cyg_uint32)50000);

    // wait 30 seconds max for not busy

    for (delay = 0; delay < 300; ++delay) {

        CYGACC_CALL_IF_DELAY_US((cyg_uint32)100000);

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

        // bail out early on bogus status

        if ((status & (IDE_STAT_BSY|IDE_STAT_DRDY)) == (IDE_STAT_BSY|IDE_STAT_DRDY))

            break;

        if (!(status & IDE_STAT_BSY))

            return 1;

    }

    return 0;

}

static int

ide_ident(int ctlr, int dev, int is_packet_dev, cyg_uint16 *buf)

{

    int i;

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_DEVICE, dev << 4);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_COMMAND, is_packet_dev ? 0xA1 : 0xEC);

    CYGACC_CALL_IF_DELAY_US((cyg_uint32)50000);

    if (!__wait_for_drq(ctlr))

        return 0;

    for (i = 0; i < (SECTOR_SIZE / sizeof(cyg_uint16)); i++, buf++)

        HAL_IDE_READ_UINT16(ctlr, IDE_REG_DATA, *buf);

    return 1;

}

static int

ide_read_sectors(int ctlr, int dev, cyg_uint32 start, cyg_uint8 count, cyg_uint16 *buf)

{

    int  i, j;

    cyg_uint16 *p;

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_COUNT, count);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBALOW, start & 0xff);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBAMID, (start >>  8) & 0xff);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBAHI,  (start >> 16) & 0xff);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_DEVICE,

                        ((start >> 24) & 0xf) | (dev << 4) | 0x40);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_COMMAND, 0x20);

    for(p = buf, i = 0; i < count; i++) {

        if (!__wait_for_drq(ctlr)) {

            diag_printf("%s: NO DRQ for ide%d, device %d.\n",

                        __FUNCTION__, ctlr, dev);

            return 0;

        }

        for (j = 0; j < (SECTOR_SIZE / sizeof(cyg_uint16)); j++, p++)

            HAL_IDE_READ_UINT16(ctlr, IDE_REG_DATA, *p);

    }

    return 1;

}

// max number of sectors to xfer during a single packet command

#define MAX_CD_XFER 16

static inline int

send_packet_command(int ctlr, int dev, cyg_uint16 len, cyg_uint16 *pkt, int pktlen)

{

    int i;

    cyg_uint8 status, reason;

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_FEATURES, 0);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_COUNT, 0);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBALOW, 0);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBAMID, len & 0xff);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_LBAHI,  (len >> 8) & 0xff);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_DEVICE, dev << 4);

    HAL_IDE_WRITE_UINT8(ctlr, IDE_REG_COMMAND, 0xA0);

    if (!__wait_for_drq(ctlr)) {

        diag_printf("%s: NO DRQ for ide%d, device %d.\n",

                    __FUNCTION__, ctlr, dev);

        return 0;

    }

    // send packet

    for (i = 0; i < (pktlen/sizeof(cyg_uint16)); i++)

        HAL_IDE_WRITE_UINT16(ctlr, IDE_REG_DATA, pkt[i]);

    // wait for not busy transferring packet

    do {

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_REASON, reason);

        if ((status & (IDE_STAT_BSY | IDE_STAT_DRQ)) == IDE_STAT_DRQ)

            if (reason & IDE_REASON_COD)

                continue;  // still wanting packet data (should timeout here)

    } while (status & IDE_STAT_BSY);

    return 1;

}

#define READ_COUNT(x)                                    \

        { unsigned char tmp;                             \

          HAL_IDE_READ_UINT8(ctlr, IDE_REG_LBAMID, tmp); \

          (x) = tmp;                                     \

          HAL_IDE_READ_UINT8(ctlr, IDE_REG_LBAHI, tmp);  \

          (x) = cdcount |= (tmp << 8);                   \

        }

// Read the sense data

static int

request_sense(int ctlr, int dev, cyg_uint16 count, cyg_uint16 *buf)

{

    int i;

    cyg_uint16 cdcount, pkt[6];

    unsigned char status, *cpkt = (unsigned char *)pkt;

    // Fill in REQUEST SENSE packet command block

    memset(cpkt, 0, sizeof(pkt));

    cpkt[0] = 0x03;

    cpkt[4] = 254;  // allocation length

    if (!send_packet_command(ctlr, dev, count, pkt, sizeof(pkt)))

        return 0;

    HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

    if (!(status & IDE_STAT_DRQ)) {

        if (status & IDE_STAT_SERVICE) {

            unsigned char reason;

            HAL_IDE_READ_UINT8(ctlr, IDE_REG_REASON, reason);

            diag_printf("%s: SERVICE request for ide%d, device %d, status[%02x], reason[%02x].\n",

                        __FUNCTION__, ctlr, dev, status, reason);

        }

        return 0;

    }

    READ_COUNT(cdcount);

    if (cdcount != count)

        diag_printf("%s: ide%d, dev%d: his cnt[%d] our count[%d].\n",

                    __FUNCTION__, ctlr, dev, cdcount, count);

    for(i = 0; i < (cdcount / sizeof(*buf)); i++, buf++)

        HAL_IDE_READ_UINT16(ctlr, IDE_REG_DATA, *buf);

    // wait for not busy transferring data

    do {

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

    } while ((status & (IDE_STAT_BSY | IDE_STAT_DRQ)) == IDE_STAT_DRQ);

    return cdcount;

}

// Interpret the sense data

static int

handle_sense(int ctlr, int dev, cyg_uint8 count, cyg_uint16 *buf)

{

#if 0

    unsigned char *p = (char *)buf;

    diag_printf("%s: %d bytes:\n", __FUNCTION__, count);

    diag_printf("sense key[%02x] additional sense[%02x]\n",

                p[2], p[12]);

#endif

    return 1;

}

static int

do_packet_read(int ctlr, int dev, cyg_uint32 start, cyg_uint8 count, cyg_uint16 *buf)

{

    int i, retry_cnt;

    cyg_uint16 cdcount, pkt[6], sense[127];

    unsigned char status, *cpkt = (unsigned char *)pkt;

    // get count number of whole cdrom sectors

    while (count) {

        retry_cnt = 3;

        i = (count > MAX_CD_XFER) ? MAX_CD_XFER : count;

    retry:

        // Fill in READ(10) packet command block

        memset(cpkt, 0, sizeof(pkt));

        cpkt[0] = 0x28;  // READ(10)

        cpkt[2] = (start >> 24) & 0xff;

        cpkt[3] = (start >> 16) & 0xff;

        cpkt[4] = (start >>  8) & 0xff;

        cpkt[5] = (start >>  0) & 0xff;

        cpkt[7] = (i >> 8) & 0xff;

        cpkt[8] = i & 0xff;

        if (!send_packet_command(ctlr, dev, i * CDROM_SECTOR_SIZE,

                                 pkt, sizeof(pkt)))

            return 0;

        HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

        if (!(status & IDE_STAT_DRQ)) {

            if (status & IDE_STAT_SERVICE) {

                unsigned char reason;

                int sense_count;

                HAL_IDE_READ_UINT8(ctlr, IDE_REG_REASON, reason);

#if 1

                diag_printf("%s: SERVICE request for ide%d, device %d, status[%02x], reason[%02x].\n",

                            __FUNCTION__, ctlr, dev, status, reason);

#endif

                sense_count = request_sense(ctlr, dev, sizeof(sense), sense);

                if (sense_count) {

                    handle_sense(ctlr, dev, sense_count, sense);

                    if (retry_cnt--)

                        goto retry;

                }

            }

            return 0;

        }

        count -= i;

        start += i;

        READ_COUNT(cdcount);

        if (cdcount != (i * CDROM_SECTOR_SIZE))

            diag_printf("%s: ide%d, dev%d: his cnt[%d] our count[%d].\n",

                        __FUNCTION__, ctlr, dev,

                        cdcount, i * CDROM_SECTOR_SIZE);

        for(i = 0; i < (cdcount / sizeof(*buf)); i++, buf++)

            HAL_IDE_READ_UINT16(ctlr, IDE_REG_DATA, *buf);

        // wait for not busy transferring data

        do {

            HAL_IDE_READ_UINT8(ctlr, IDE_REG_STATUS, status);

        } while ((status & (IDE_STAT_BSY | IDE_STAT_DRQ)) == IDE_STAT_DRQ);

    }

    return 1;

}

static int

ide_packet_read_sectors(int ctlr, int dev, cyg_uint32 start, cyg_uint8 count, cyg_uint16 *buf)

{

    int  i, extra;

    cyg_uint32 cdstart;

    static cyg_uint16 cdsec_buf[CDROM_SECTOR_SIZE/sizeof(cyg_uint16)];

    cdstart = (start + SECTORS_PER_CDROM_SECTOR-1) / SECTORS_PER_CDROM_SECTOR;

    // align to cdrom sector boundary.

    if (start % SECTORS_PER_CDROM_SECTOR) {

        if (!ide_packet_read_sectors(ctlr, dev,

                                     cdstart * SECTORS_PER_CDROM_SECTOR,

                                     SECTORS_PER_CDROM_SECTOR, cdsec_buf))

            return 0;

        i = SECTORS_PER_CDROM_SECTOR - (start % SECTORS_PER_CDROM_SECTOR);

        if (i > count)

            i = count;

        memcpy(buf, cdsec_buf + ((start % CDROM_SECTOR_SIZE) * SECTOR_SIZE),

               i * SECTOR_SIZE);

        count -= i;

        buf += (i * SECTOR_SIZE) / sizeof(*buf);

        ++cdstart;

    }

    extra = count % SECTORS_PER_CDROM_SECTOR;

    count /= SECTORS_PER_CDROM_SECTOR;

    if (count) {

        if (!do_packet_read(ctlr, dev, cdstart, count, buf))

            return 0;

        buf += count * SECTORS_PER_CDROM_SECTOR * SECTOR_SIZE;

    }

    if (extra) {

        // read cdrom sector 

        if (!ide_packet_read_sectors(ctlr, dev,

                                     cdstart * SECTORS_PER_CDROM_SECTOR,

                                     extra, cdsec_buf))

            return 0;

        memcpy(buf, cdsec_buf, extra * SECTOR_SIZE);

    }

    return 1;

}

static int

ide_read(struct disk *d,

         cyg_uint32 start_sec, cyg_uint32 *buf, cyg_uint8 nr_secs)

{

    struct ide_priv *p = (struct ide_priv *)(d->private);

    if (p->flags & IDE_DEV_PACKET)

        return ide_packet_read_sectors(p->controller, p->drive,

                                     start_sec, nr_secs, (cyg_uint16 *)buf);

    return ide_read_sectors(p->controller, p->drive,

                            start_sec, nr_secs, (cyg_uint16 *)buf);

}

static void

ide_init(void)

{

    cyg_uint32 buf[SECTOR_SIZE/sizeof(cyg_uint32)], u32;

    cyg_uint16 u16;

    cyg_uint8 u8;

    int i, j;

    disk_t disk;

    struct ide_priv *priv;

#define DEV_INIT_VAL ((j << 4) | 0xA0)

    HAL_IDE_INIT();

    CYGACC_CALL_IF_DELAY_US(5);

    priv = ide_privs;

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

        // soft reset the devices on this controller

        if (!ide_reset(i))

            continue;

        // 2 devices per controller

        for (j = 0; j < 2; j++, priv++) {

            priv->controller = i;

            priv->drive = j;

            priv->flags = 0;

            // This is reminiscent of a memory test. We write a value

            // to a certain location (device register), then write a

            // different value somewhere else so that the first value

            // is not hanging on the bus, then we read back the first

            // value to see if the write was succesful.

            //

            HAL_IDE_WRITE_UINT8(i, IDE_REG_DEVICE, DEV_INIT_VAL);

            HAL_IDE_WRITE_UINT8(i, IDE_REG_FEATURES, 0);

            CYGACC_CALL_IF_DELAY_US(50000);

            HAL_IDE_READ_UINT8(i, IDE_REG_DEVICE, u8);

            if (u8 != DEV_INIT_VAL) {

                diag_printf("IDE failed to identify unit %d - wrote: %x, read: %x\n",

                            i, DEV_INIT_VAL, u8);

                continue;

            }

            // device present

            priv->flags |= IDE_DEV_PRESENT;

            if (ide_ident(i, j, 0, (cyg_uint16 *)buf) <= 0) {

                if (ide_ident(i, j, 1, (cyg_uint16 *)buf) <= 0) {

                    priv->flags = 0;

                    continue;  // can't identify device

                } else {

                    u16 = *(cyg_uint16 *)((char *)buf + IDE_DEVID_GENCONFIG);

                    if (((u16 >> 8) & 0x1f) != 5) {

                        diag_printf("Non-CDROM ATAPI device #%d - skipped\n", i);

                        continue;

                    }

                    priv->flags |= IDE_DEV_PACKET;

                }

            }

            memset(&disk, 0, sizeof(disk));

            disk.funs = &ide_funs;

            disk.private = priv;

            disk.kind = DISK_IDE_HD;  // until proven otherwise

            if (priv->flags & IDE_DEV_PACKET) {

                u16 = *(cyg_uint16 *)((char *)buf + IDE_DEVID_GENCONFIG);

                if (((u16 >> 8) & 0x1f) == 5)

                    disk.kind = DISK_IDE_CDROM;

            } else {

                u32 = *(cyg_uint32 *)((char *)buf + IDE_DEVID_LBA_CAPACITY);

                disk.nr_sectors = u32;

            }

            if (!disk_register(&disk))

                return;

        }

    }

}

RedBoot_init(ide_init, RedBoot_INIT_FIRST);