// SPDX-License-Identifier: GPL-2.0-only

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/ide.h>

#if defined(CONFIG_ARM) || defined(CONFIG_M68K) || defined(CONFIG_MIPS) || \
    defined(CONFIG_PARISC) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
#include <asm/ide.h>
#else
#include <asm-generic/ide_iops.h>
#endif

/*
 *      Conventional PIO operations for ATA devices
 */

static u8 ide_inb(unsigned long port)
{
        return (u8) inb(port);
}

static void ide_outb(u8 val, unsigned long port)
{
        outb(val, port);
}

/*
 *      MMIO operations, typically used for SATA controllers
 */

static u8 ide_mm_inb(unsigned long port)
{
        return (u8) readb((void __iomem *) port);
}

static void ide_mm_outb(u8 value, unsigned long port)
{
        writeb(value, (void __iomem *) port);
}

void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
{
        if (hwif->host_flags & IDE_HFLAG_MMIO)
                writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
        else
                outb(cmd, hwif->io_ports.command_addr);
}
EXPORT_SYMBOL_GPL(ide_exec_command);

u8 ide_read_status(ide_hwif_t *hwif)
{
        if (hwif->host_flags & IDE_HFLAG_MMIO)
                return readb((void __iomem *)hwif->io_ports.status_addr);
        else
                return inb(hwif->io_ports.status_addr);
}
EXPORT_SYMBOL_GPL(ide_read_status);

u8 ide_read_altstatus(ide_hwif_t *hwif)
{
        if (hwif->host_flags & IDE_HFLAG_MMIO)
                return readb((void __iomem *)hwif->io_ports.ctl_addr);
        else
                return inb(hwif->io_ports.ctl_addr);
}
EXPORT_SYMBOL_GPL(ide_read_altstatus);

void ide_write_devctl(ide_hwif_t *hwif, u8 ctl)
{
        if (hwif->host_flags & IDE_HFLAG_MMIO)
                writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
        else
                outb(ctl, hwif->io_ports.ctl_addr);
}
EXPORT_SYMBOL_GPL(ide_write_devctl);

void ide_dev_select(ide_drive_t *drive)
{
        ide_hwif_t *hwif = drive->hwif;
        u8 select = drive->select | ATA_DEVICE_OBS;

        if (hwif->host_flags & IDE_HFLAG_MMIO)
                writeb(select, (void __iomem *)hwif->io_ports.device_addr);
        else
                outb(select, hwif->io_ports.device_addr);
}
EXPORT_SYMBOL_GPL(ide_dev_select);

void ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
{
        ide_hwif_t *hwif = drive->hwif;
        struct ide_io_ports *io_ports = &hwif->io_ports;
        void (*tf_outb)(u8 addr, unsigned long port);
        u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

        if (mmio)
                tf_outb = ide_mm_outb;
        else
                tf_outb = ide_outb;

        if (valid & IDE_VALID_FEATURE)
                tf_outb(tf->feature, io_ports->feature_addr);
        if (valid & IDE_VALID_NSECT)
                tf_outb(tf->nsect, io_ports->nsect_addr);
        if (valid & IDE_VALID_LBAL)
                tf_outb(tf->lbal, io_ports->lbal_addr);
        if (valid & IDE_VALID_LBAM)
                tf_outb(tf->lbam, io_ports->lbam_addr);
        if (valid & IDE_VALID_LBAH)
                tf_outb(tf->lbah, io_ports->lbah_addr);
        if (valid & IDE_VALID_DEVICE)
                tf_outb(tf->device, io_ports->device_addr);
}
EXPORT_SYMBOL_GPL(ide_tf_load);

void ide_tf_read(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
{
        ide_hwif_t *hwif = drive->hwif;
        struct ide_io_ports *io_ports = &hwif->io_ports;
        u8 (*tf_inb)(unsigned long port);
        u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

        if (mmio)
                tf_inb  = ide_mm_inb;
        else
                tf_inb  = ide_inb;

        if (valid & IDE_VALID_ERROR)
                tf->error  = tf_inb(io_ports->feature_addr);
        if (valid & IDE_VALID_NSECT)
                tf->nsect  = tf_inb(io_ports->nsect_addr);
        if (valid & IDE_VALID_LBAL)
                tf->lbal   = tf_inb(io_ports->lbal_addr);
        if (valid & IDE_VALID_LBAM)
                tf->lbam   = tf_inb(io_ports->lbam_addr);
        if (valid & IDE_VALID_LBAH)
                tf->lbah   = tf_inb(io_ports->lbah_addr);
        if (valid & IDE_VALID_DEVICE)
                tf->device = tf_inb(io_ports->device_addr);
}
EXPORT_SYMBOL_GPL(ide_tf_read);

/*
 * Some localbus EIDE interfaces require a special access sequence
 * when using 32-bit I/O instructions to transfer data.  We call this
 * the "vlb_sync" sequence, which consists of three successive reads
 * of the sector count register location, with interrupts disabled
 * to ensure that the reads all happen together.
 */
static void ata_vlb_sync(unsigned long port)
{
        (void)inb(port);
        (void)inb(port);
        (void)inb(port);
}

/*
 * This is used for most PIO data transfers *from* the IDE interface
 *
 * These routines will round up any request for an odd number of bytes,
 * so if an odd len is specified, be sure that there's at least one
 * extra byte allocated for the buffer.
 */
void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                    unsigned int len)
{
        ide_hwif_t *hwif = drive->hwif;
        struct ide_io_ports *io_ports = &hwif->io_ports;
        unsigned long data_addr = io_ports->data_addr;
        unsigned int words = (len + 1) >> 1;
        u8 io_32bit = drive->io_32bit;
        u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

        if (io_32bit) {
                unsigned long uninitialized_var(flags);

                if ((io_32bit & 2) && !mmio) {
                        local_irq_save(flags);
                        ata_vlb_sync(io_ports->nsect_addr);
                }

                words >>= 1;
                if (mmio)
                        __ide_mm_insl((void __iomem *)data_addr, buf, words);
                else
                        insl(data_addr, buf, words);

                if ((io_32bit & 2) && !mmio)
                        local_irq_restore(flags);

                if (((len + 1) & 3) < 2)
                        return;

                buf += len & ~3;
                words = 1;
        }

        if (mmio)
                __ide_mm_insw((void __iomem *)data_addr, buf, words);
        else
                insw(data_addr, buf, words);
}
EXPORT_SYMBOL_GPL(ide_input_data);

/*
 * This is used for most PIO data transfers *to* the IDE interface
 */
void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                     unsigned int len)
{
        ide_hwif_t *hwif = drive->hwif;
        struct ide_io_ports *io_ports = &hwif->io_ports;
        unsigned long data_addr = io_ports->data_addr;
        unsigned int words = (len + 1) >> 1;
        u8 io_32bit = drive->io_32bit;
        u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

        if (io_32bit) {
                unsigned long uninitialized_var(flags);

                if ((io_32bit & 2) && !mmio) {
                        local_irq_save(flags);
                        ata_vlb_sync(io_ports->nsect_addr);
                }

                words >>= 1;
                if (mmio)
                        __ide_mm_outsl((void __iomem *)data_addr, buf, words);
                else
                        outsl(data_addr, buf, words);

                if ((io_32bit & 2) && !mmio)
                        local_irq_restore(flags);

                if (((len + 1) & 3) < 2)
                        return;

                buf += len & ~3;
                words = 1;
        }

        if (mmio)
                __ide_mm_outsw((void __iomem *)data_addr, buf, words);
        else
                outsw(data_addr, buf, words);
}
EXPORT_SYMBOL_GPL(ide_output_data);

const struct ide_tp_ops default_tp_ops = {
        .exec_command           = ide_exec_command,
        .read_status            = ide_read_status,
        .read_altstatus         = ide_read_altstatus,
        .write_devctl           = ide_write_devctl,

        .dev_select             = ide_dev_select,
        .tf_load                = ide_tf_load,
        .tf_read                = ide_tf_read,

        .input_data             = ide_input_data,
        .output_data            = ide_output_data,
};