/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  sata_promise.h - Promise SATA common definitions and inline funcs
 *
 *  Copyright 2003-2004 Red Hat, Inc.
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/driver-api/libata.rst
 */

#ifndef __SATA_PROMISE_H__
#define __SATA_PROMISE_H__

#include <linux/ata.h>

enum pdc_packet_bits {
        PDC_PKT_READ            = (1 << 2),
        PDC_PKT_NODATA          = (1 << 3),

        PDC_PKT_SIZEMASK        = (1 << 7) | (1 << 6) | (1 << 5),
        PDC_PKT_CLEAR_BSY       = (1 << 4),
        PDC_PKT_WAIT_DRDY       = (1 << 3) | (1 << 4),
        PDC_LAST_REG            = (1 << 3),

        PDC_REG_DEVCTL          = (1 << 3) | (1 << 2) | (1 << 1),
};

static inline unsigned int pdc_pkt_header(struct ata_taskfile *tf,
                                          dma_addr_t sg_table,
                                          unsigned int devno, u8 *buf)
{
        u8 dev_reg;
        __le32 *buf32 = (__le32 *) buf;

        /* set control bits (byte 0), zero delay seq id (byte 3),
         * and seq id (byte 2)
         */
        switch (tf->protocol) {
        case ATA_PROT_DMA:
                if (!(tf->flags & ATA_TFLAG_WRITE))
                        buf32[0] = cpu_to_le32(PDC_PKT_READ);
                else
                        buf32[0] = 0;
                break;

        case ATA_PROT_NODATA:
                buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
                break;

        default:
                BUG();
                break;
        }

        buf32[1] = cpu_to_le32(sg_table);       /* S/G table addr */
        buf32[2] = 0;                           /* no next-packet */

        if (devno == 0)
                dev_reg = ATA_DEVICE_OBS;
        else
                dev_reg = ATA_DEVICE_OBS | ATA_DEV1;

        /* select device */
        buf[12] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
        buf[13] = dev_reg;

        /* device control register */
        buf[14] = (1 << 5) | PDC_REG_DEVCTL;
        buf[15] = tf->ctl;

        return 16;      /* offset of next byte */
}

static inline unsigned int pdc_pkt_footer(struct ata_taskfile *tf, u8 *buf,
                                  unsigned int i)
{
        if (tf->flags & ATA_TFLAG_DEVICE) {
                buf[i++] = (1 << 5) | ATA_REG_DEVICE;
                buf[i++] = tf->device;
        }

        /* and finally the command itself; also includes end-of-pkt marker */
        buf[i++] = (1 << 5) | PDC_LAST_REG | ATA_REG_CMD;
        buf[i++] = tf->command;

        return i;
}

static inline unsigned int pdc_prep_lba28(struct ata_taskfile *tf, u8 *buf, unsigned int i)
{
        /* the "(1 << 5)" should be read "(count << 5)" */

        /* ATA command block registers */
        buf[i++] = (1 << 5) | ATA_REG_FEATURE;
        buf[i++] = tf->feature;

        buf[i++] = (1 << 5) | ATA_REG_NSECT;
        buf[i++] = tf->nsect;

        buf[i++] = (1 << 5) | ATA_REG_LBAL;
        buf[i++] = tf->lbal;

        buf[i++] = (1 << 5) | ATA_REG_LBAM;
        buf[i++] = tf->lbam;

        buf[i++] = (1 << 5) | ATA_REG_LBAH;
        buf[i++] = tf->lbah;

        return i;
}

static inline unsigned int pdc_prep_lba48(struct ata_taskfile *tf, u8 *buf, unsigned int i)
{
        /* the "(2 << 5)" should be read "(count << 5)" */

        /* ATA command block registers */
        buf[i++] = (2 << 5) | ATA_REG_FEATURE;
        buf[i++] = tf->hob_feature;
        buf[i++] = tf->feature;

        buf[i++] = (2 << 5) | ATA_REG_NSECT;
        buf[i++] = tf->hob_nsect;
        buf[i++] = tf->nsect;

        buf[i++] = (2 << 5) | ATA_REG_LBAL;
        buf[i++] = tf->hob_lbal;
        buf[i++] = tf->lbal;

        buf[i++] = (2 << 5) | ATA_REG_LBAM;
        buf[i++] = tf->hob_lbam;
        buf[i++] = tf->lbam;

        buf[i++] = (2 << 5) | ATA_REG_LBAH;
        buf[i++] = tf->hob_lbah;
        buf[i++] = tf->lbah;

        return i;
}


#endif /* __SATA_PROMISE_H__ */