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/*

 * pata_ns87410.c       - National Semiconductor 87410 PATA for new ATA layer

 *                        (C) 2006 Red Hat Inc

 *                        Alan Cox <alan@redhat.com>

 *

 *  This program 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.

 *

 *  This program 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 this program; see the file COPYING.  If not, write to

 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#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_ns87410"

#define DRV_VERSION "0.4.6"

/**

 *      ns87410_pre_reset               -       probe begin

 *      @link: ATA link

 *      @deadline: deadline jiffies for the operation

 *

 *      Check enabled ports

 */

static int ns87410_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 ns87410_enable_bits[] = {

                { 0x43, 1, 0x08, 0x08 },

                { 0x47, 1, 0x08, 0x08 }

        };

        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))

                return -ENOENT;

        return ata_std_prereset(link, deadline);

}

/**

 *      ns87410_error_handler           -       probe reset

 *      @ap: ATA port

 *

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

 *      for this hardware. The MPIIX has the enable bits in a different place

 *      to PIIX4 and friends. As a pure PIO device it has no cable detect

 */

static void ns87410_error_handler(struct ata_port *ap)

{

        ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);

}

/**

 *      ns87410_set_piomode     -       set initial PIO mode data

 *      @ap: ATA interface

 *      @adev: ATA device

 *

 *      Program timing data. This is kept per channel not per device,

 *      and only affects the data port.

 */

static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

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

        int port = 0x40 + 4 * ap->port_no;

        u8 idetcr, idefr;

        struct ata_timing at;

        static const u8 activebits[15] = {

                0, 1, 2, 3, 4,

                5, 5, 6, 6, 6,

                6, 7, 7, 7, 7

        };

        static const u8 recoverbits[12] = {

                0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7

        };

        pci_read_config_byte(pdev, port + 3, &idefr);

        if (ata_pio_need_iordy(adev))

                idefr |= 0x04;  /* IORDY enable */

        else

                idefr &= ~0x04;

        if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {

                dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);

                return;

        }

        at.active = FIT(at.active, 2, 16) - 2;

        at.setup = FIT(at.setup, 1, 4) - 1;

        at.recover = FIT(at.recover, 1, 12) - 1;

        idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];

        pci_write_config_byte(pdev, port, idetcr);

        pci_write_config_byte(pdev, port + 3, idefr);

        /* We use ap->private_data as a pointer to the device currently

           loaded for timing */

        ap->private_data = adev;

}

/**

 *      ns87410_qc_issue_prot   -       command issue

 *      @qc: command pending

 *

 *      Called when the libata layer is about to issue a command. We wrap

 *      this interface so that we can load the correct ATA timings if

 *      necessary.

 */

static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)

{

        struct ata_port *ap = qc->ap;

        struct ata_device *adev = qc->dev;

        /* If modes have been configured and the channel data is not loaded

           then load it. We have to check if pio_mode is set as the core code

           does not set adev->pio_mode to XFER_PIO_0 while probing as would be

           logical */

        if (adev->pio_mode && adev != ap->private_data)

                ns87410_set_piomode(ap, adev);

        return ata_qc_issue_prot(qc);

}

static struct scsi_host_template ns87410_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 ns87410_port_ops = {

        .set_piomode    = ns87410_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  = ns87410_error_handler,

        .post_internal_cmd = ata_bmdma_post_internal_cmd,

        .cable_detect   = ata_cable_40wire,

        .qc_prep        = ata_qc_prep,

        .qc_issue       = ns87410_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 ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)

{

        static const struct ata_port_info info = {

                .sht = &ns87410_sht,

                .flags = ATA_FLAG_SLAVE_POSS,

                .pio_mask = 0x0F,

                .port_ops = &ns87410_port_ops

        };

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

        return ata_pci_init_one(dev, ppi);

}

static const struct pci_device_id ns87410[] = {

        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },

        { },

};

static struct pci_driver ns87410_pci_driver = {

        .name           = DRV_NAME,

        .id_table       = ns87410,

        .probe          = ns87410_init_one,

        .remove         = ata_pci_remove_one,

#ifdef CONFIG_PM

        .suspend        = ata_pci_device_suspend,

        .resume         = ata_pci_device_resume,

#endif

};

static int __init ns87410_init(void)

{

        return pci_register_driver(&ns87410_pci_driver);

}

static void __exit ns87410_exit(void)

{

        pci_unregister_driver(&ns87410_pci_driver);

}

MODULE_AUTHOR("Alan Cox");

MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, ns87410);

MODULE_VERSION(DRV_VERSION);

module_init(ns87410_init);

module_exit(ns87410_exit);