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/*

 * pata_opti.c  - ATI PATA for new ATA layer

 *                        (C) 2005 Red Hat Inc

 *                        Alan Cox <alan@redhat.com>

 *

 * Based on

 *  linux/drivers/ide/pci/opti621.c             Version 0.7     Sept 10, 2002

 *

 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)

 *

 * Authors:

 * Jaromir Koutek <miri@punknet.cz>,

 * Jan Harkes <jaharkes@cwi.nl>,

 * Mark Lord <mlord@pobox.com>

 * Some parts of code are from ali14xx.c and from rz1000.c.

 *

 * Also consulted the FreeBSD prototype driver by Kevin Day to try

 * and resolve some confusions. Further documentation can be found in

 * Ralf Brown's interrupt list

 *

 * If you have other variants of the Opti range (Viper/Vendetta) please

 * try this driver with those PCI idents and report back. For the later

 * chips see the pata_optidma driver

 *

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/init.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <scsi/scsi_host.h>

#include <linux/libata.h>

#define DRV_NAME "pata_opti"

#define DRV_VERSION "0.2.9"

enum {

        READ_REG        = 0,     /* index of Read cycle timing register */

        WRITE_REG       = 1,    /* index of Write cycle timing register */

        CNTRL_REG       = 3,    /* index of Control register */

        STRAP_REG       = 5,    /* index of Strap register */

        MISC_REG        = 6     /* index of Miscellaneous register */

};

/**

 *      opti_pre_reset          -       probe begin

 *      @link: ATA link

 *      @deadline: deadline jiffies for the operation

 *

 *      Set up cable type and use generic probe init

 */

static int opti_pre_reset(struct ata_link *link, unsigned long deadline)

{

        struct ata_port *ap = link->ap;

        struct pci_dev *pdev = to_pci_dev(ap->host->dev);

        static const struct pci_bits opti_enable_bits[] = {

                { 0x45, 1, 0x80, 0x00 },

                { 0x40, 1, 0x08, 0x00 }

        };

        if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))

                return -ENOENT;

        return ata_std_prereset(link, deadline);

}

/**

 *      opti_probe_reset                -       probe reset

 *      @ap: ATA port

 *

 *      Perform the ATA probe and bus reset sequence plus specific handling

 *      for this hardware. The Opti needs little handling - we have no UDMA66

 *      capability that needs cable detection. All we must do is check the port

 *      is enabled.

 */

static void opti_error_handler(struct ata_port *ap)

{

        ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);

}

/**

 *      opti_write_reg          -       control register setup

 *      @ap: ATA port

 *      @value: value

 *      @reg: control register number

 *

 *      The Opti uses magic 'trapdoor' register accesses to do configuration

 *      rather than using PCI space as other controllers do. The double inw

 *      on the error register activates configuration mode. We can then write

 *      the control register

 */

static void opti_write_reg(struct ata_port *ap, u8 val, int reg)

{

        void __iomem *regio = ap->ioaddr.cmd_addr;

        /* These 3 unlock the control register access */

        ioread16(regio + 1);

        ioread16(regio + 1);

        iowrite8(3, regio + 2);

        /* Do the I/O */

        iowrite8(val, regio + reg);

        /* Relock */

        iowrite8(0x83, regio + 2);

}

/**

 *      opti_set_piomode        -       set initial PIO mode data

 *      @ap: ATA interface

 *      @adev: ATA device

 *

 *      Called to do the PIO mode setup. Timing numbers are taken from

 *      the FreeBSD driver then pre computed to keep the code clean. There

 *      are two tables depending on the hardware clock speed.

 */

static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

        struct ata_device *pair = ata_dev_pair(adev);

        int clock;

        int pio = adev->pio_mode - XFER_PIO_0;

        void __iomem *regio = ap->ioaddr.cmd_addr;

        u8 addr;

        /* Address table precomputed with prefetch off and a DCLK of 2 */

        static const u8 addr_timing[2][5] = {

                { 0x30, 0x20, 0x20, 0x10, 0x10 },

                { 0x20, 0x20, 0x10, 0x10, 0x10 }

        };

        static const u8 data_rec_timing[2][5] = {

                { 0x6B, 0x56, 0x42, 0x32, 0x31 },

                { 0x58, 0x44, 0x32, 0x22, 0x21 }

        };

        iowrite8(0xff, regio + 5);

        clock = ioread16(regio + 5) & 1;

        /*

         *      As with many controllers the address setup time is shared

         *      and must suit both devices if present.

         */

        addr = addr_timing[clock][pio];

        if (pair) {

                /* Hardware constraint */

                u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];

                if (pair_addr > addr)

                        addr = pair_addr;

        }

        /* Commence primary programming sequence */

        opti_write_reg(ap, adev->devno, MISC_REG);

        opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);

        opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);

        opti_write_reg(ap, addr, MISC_REG);

        /* Programming sequence complete, override strapping */

        opti_write_reg(ap, 0x85, CNTRL_REG);

}

static struct scsi_host_template opti_sht = {

        .module                 = THIS_MODULE,

        .name                   = DRV_NAME,

        .ioctl                  = ata_scsi_ioctl,

        .queuecommand           = ata_scsi_queuecmd,

        .can_queue              = ATA_DEF_QUEUE,

        .this_id                = ATA_SHT_THIS_ID,

        .sg_tablesize           = LIBATA_MAX_PRD,

        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,

        .emulated               = ATA_SHT_EMULATED,

        .use_clustering         = ATA_SHT_USE_CLUSTERING,

        .proc_name              = DRV_NAME,

        .dma_boundary           = ATA_DMA_BOUNDARY,

        .slave_configure        = ata_scsi_slave_config,

        .slave_destroy          = ata_scsi_slave_destroy,

        .bios_param             = ata_std_bios_param,

};

static struct ata_port_operations opti_port_ops = {

        .set_piomode    = opti_set_piomode,

        .tf_load        = ata_tf_load,

        .tf_read        = ata_tf_read,

        .check_status   = ata_check_status,

        .exec_command   = ata_exec_command,

        .dev_select     = ata_std_dev_select,

        .freeze         = ata_bmdma_freeze,

        .thaw           = ata_bmdma_thaw,

        .error_handler  = opti_error_handler,

        .post_internal_cmd = ata_bmdma_post_internal_cmd,

        .cable_detect   = ata_cable_40wire,

        .bmdma_setup    = ata_bmdma_setup,

        .bmdma_start    = ata_bmdma_start,

        .bmdma_stop     = ata_bmdma_stop,

        .bmdma_status   = ata_bmdma_status,

        .qc_prep        = ata_qc_prep,

        .qc_issue       = ata_qc_issue_prot,

        .data_xfer      = ata_data_xfer,

        .irq_handler    = ata_interrupt,

        .irq_clear      = ata_bmdma_irq_clear,

        .irq_on         = ata_irq_on,

        .port_start     = ata_sff_port_start,

};

static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht = &opti_sht,

                .flags = ATA_FLAG_SLAVE_POSS,

                .pio_mask = 0x1f,

                .port_ops = &opti_port_ops

        };

        const struct ata_port_info *ppi[] = { &info, NULL };

        static int printed_version;

        if (!printed_version++)

                dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");

        return ata_pci_init_one(dev, ppi);

}

static const struct pci_device_id opti[] = {

        { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },

        { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },

        { },

};

static struct pci_driver opti_pci_driver = {

        .name           = DRV_NAME,

        .id_table       = opti,

        .probe          = opti_init_one,

        .remove         = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend        = ata_pci_device_suspend,

        .resume         = ata_pci_device_resume,

#endif

};

static int __init opti_init(void)

{

        return pci_register_driver(&opti_pci_driver);

}

static void __exit opti_exit(void)

{

        pci_unregister_driver(&opti_pci_driver);

}

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("low-level driver for Opti 621/621X");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, opti);

MODULE_VERSION(DRV_VERSION);

module_init(opti_init);

module_exit(opti_exit);