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pata_ns87410.c

/*
 * 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);

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