// SPDX-License-Identifier: GPL-2.0-only
/*
 * ITE 8213 IDE driver
 *
 * Copyright (C) 2006 Jack Lee
 * Copyright (C) 2006 Alan Cox
 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>

#define DRV_NAME "it8213"

/**
 *      it8213_set_pio_mode     -       set host controller for PIO mode
 *      @hwif: port
 *      @drive: drive
 *
 *      Set the interface PIO mode.
 */

static void it8213_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
        struct pci_dev *dev     = to_pci_dev(hwif->dev);
        int is_slave            = drive->dn & 1;
        int master_port         = 0x40;
        int slave_port          = 0x44;
        unsigned long flags;
        u16 master_data;
        u8 slave_data;
        static DEFINE_SPINLOCK(tune_lock);
        int control = 0;
        const u8 pio = drive->pio_mode - XFER_PIO_0;

        static const u8 timings[][2] = {
                                        { 0, 0 },
                                        { 0, 0 },
                                        { 1, 0 },
                                        { 2, 1 },
                                        { 2, 3 }, };

        spin_lock_irqsave(&tune_lock, flags);
        pci_read_config_word(dev, master_port, &master_data);

        if (pio > 1)
                control |= 1;   /* Programmable timing on */
        if (drive->media != ide_disk)
                control |= 4;   /* ATAPI */
        if (ide_pio_need_iordy(drive, pio))
                control |= 2;   /* IORDY */
        if (is_slave) {
                master_data |=  0x4000;
                master_data &= ~0x0070;
                if (pio > 1)
                        master_data = master_data | (control << 4);
                pci_read_config_byte(dev, slave_port, &slave_data);
                slave_data = slave_data & 0xf0;
                slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
        } else {
                master_data &= ~0x3307;
                if (pio > 1)
                        master_data = master_data | control;
                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
        }
        pci_write_config_word(dev, master_port, master_data);
        if (is_slave)
                pci_write_config_byte(dev, slave_port, slave_data);
        spin_unlock_irqrestore(&tune_lock, flags);
}

/**
 *      it8213_set_dma_mode     -       set host controller for DMA mode
 *      @hwif: port
 *      @drive: drive
 *
 *      Tune the ITE chipset for the DMA mode.
 */

static void it8213_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
        struct pci_dev *dev     = to_pci_dev(hwif->dev);
        u8 maslave              = 0x40;
        int a_speed             = 3 << (drive->dn * 4);
        int u_flag              = 1 << drive->dn;
        int v_flag              = 0x01 << drive->dn;
        int w_flag              = 0x10 << drive->dn;
        int u_speed             = 0;
        u16                     reg4042, reg4a;
        u8                      reg48, reg54, reg55;
        const u8 speed          = drive->dma_mode;

        pci_read_config_word(dev, maslave, &reg4042);
        pci_read_config_byte(dev, 0x48, &reg48);
        pci_read_config_word(dev, 0x4a, &reg4a);
        pci_read_config_byte(dev, 0x54, &reg54);
        pci_read_config_byte(dev, 0x55, &reg55);

        if (speed >= XFER_UDMA_0) {
                u8 udma = speed - XFER_UDMA_0;

                u_speed = min_t(u8, 2 - (udma & 1), udma) << (drive->dn * 4);

                if (!(reg48 & u_flag))
                        pci_write_config_byte(dev, 0x48, reg48 | u_flag);
                if (speed >= XFER_UDMA_5)
                        pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
                else
                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);

                if ((reg4a & a_speed) != u_speed)
                        pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
                if (speed > XFER_UDMA_2) {
                        if (!(reg54 & v_flag))
                                pci_write_config_byte(dev, 0x54, reg54 | v_flag);
                } else
                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
        } else {
                const u8 mwdma_to_pio[] = { 0, 3, 4 };

                if (reg48 & u_flag)
                        pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
                if (reg4a & a_speed)
                        pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
                if (reg54 & v_flag)
                        pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
                if (reg55 & w_flag)
                        pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);

                if (speed >= XFER_MW_DMA_0)
                        drive->pio_mode =
                                mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
                else
                        drive->pio_mode = XFER_PIO_2; /* for SWDMA2 */

                it8213_set_pio_mode(hwif, drive);
        }
}

static u8 it8213_cable_detect(ide_hwif_t *hwif)
{
        struct pci_dev *dev = to_pci_dev(hwif->dev);
        u8 reg42h = 0;

        pci_read_config_byte(dev, 0x42, &reg42h);

        return (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}

static const struct ide_port_ops it8213_port_ops = {
        .set_pio_mode           = it8213_set_pio_mode,
        .set_dma_mode           = it8213_set_dma_mode,
        .cable_detect           = it8213_cable_detect,
};

static const struct ide_port_info it8213_chipset = {
        .name           = DRV_NAME,
        .enablebits     = { {0x41, 0x80, 0x80} },
        .port_ops       = &it8213_port_ops,
        .host_flags     = IDE_HFLAG_SINGLE,
        .pio_mask       = ATA_PIO4,
        .swdma_mask     = ATA_SWDMA2_ONLY,
        .mwdma_mask     = ATA_MWDMA12_ONLY,
        .udma_mask      = ATA_UDMA6,
};

/**
 *      it8213_init_one -       pci layer discovery entry
 *      @dev: PCI device
 *      @id: ident table entry
 *
 *      Called by the PCI code when it finds an ITE8213 controller. As
 *      this device follows the standard interfaces we can use the
 *      standard helper functions to do almost all the work for us.
 */

static int it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
        return ide_pci_init_one(dev, &it8213_chipset, NULL);
}

static const struct pci_device_id it8213_pci_tbl[] = {
        { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), 0 },
        { 0, },
};

MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);

static struct pci_driver it8213_pci_driver = {
        .name           = "ITE8213_IDE",
        .id_table       = it8213_pci_tbl,
        .probe          = it8213_init_one,
        .remove         = ide_pci_remove,
        .suspend        = ide_pci_suspend,
        .resume         = ide_pci_resume,
};

static int __init it8213_ide_init(void)
{
        return ide_pci_register_driver(&it8213_pci_driver);
}

static void __exit it8213_ide_exit(void)
{
        pci_unregister_driver(&it8213_pci_driver);
}

module_init(it8213_ide_init);
module_exit(it8213_ide_exit);

MODULE_AUTHOR("Jack Lee, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
MODULE_LICENSE("GPL");