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pata_atiixp.c

/*
 * pata_atiixp.c  - ATI PATA for new ATA layer
 *                  (C) 2005 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 * Based on
 *
 *  linux/drivers/ide/pci/atiixp.c  Version 0.01-bart2      Feb. 26, 2004
 *
 *  Copyright (C) 2003 ATI Inc. <hyu@ati.com>
 *  Copyright (C) 2004 Bartlomiej Zolnierkiewicz
 *
 */

#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_atiixp"
#define DRV_VERSION "0.4.6"

enum {
      ATIIXP_IDE_PIO_TIMING   = 0x40,
      ATIIXP_IDE_MWDMA_TIMING = 0x44,
      ATIIXP_IDE_PIO_CONTROL  = 0x48,
      ATIIXP_IDE_PIO_MODE     = 0x4a,
      ATIIXP_IDE_UDMA_CONTROL = 0x54,
      ATIIXP_IDE_UDMA_MODE    = 0x56
};

static int atiixp_pre_reset(struct ata_link *link, unsigned long deadline)
{
      struct ata_port *ap = link->ap;
      static const struct pci_bits atiixp_enable_bits[] = {
            { 0x48, 1, 0x01, 0x00 },
            { 0x48, 1, 0x08, 0x00 }
      };
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);

      if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
            return -ENOENT;

      return ata_std_prereset(link, deadline);
}

static void atiixp_error_handler(struct ata_port *ap)
{
      ata_bmdma_drive_eh(ap, atiixp_pre_reset, ata_std_softreset, NULL,   ata_std_postreset);
}

static int atiixp_cable_detect(struct ata_port *ap)
{
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      u8 udma;

      /* Hack from drivers/ide/pci. Really we want to know how to do the
         raw detection not play follow the bios mode guess */
      pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
      if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
            return  ATA_CBL_PATA80;
      return ATA_CBL_PATA40;
}

/**
 *    atiixp_set_pio_timing   -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called by both the pio and dma setup functions to set the controller
 *    timings for PIO transfers. We must load both the mode number and
 *    timing values into the controller.
 */

static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
{
      static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };

      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      int dn = 2 * ap->port_no + adev->devno;

      /* Check this is correct - the order is odd in both drivers */
      int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
      u16 pio_mode_data, pio_timing_data;

      pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
      pio_mode_data &= ~(0x7 << (4 * dn));
      pio_mode_data |= pio << (4 * dn);
      pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);

      pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
      pio_mode_data &= ~(0xFF << timing_shift);
      pio_mode_data |= (pio_timings[pio] << timing_shift);
      pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
}

/**
 *    atiixp_set_piomode      -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called to do the PIO mode setup. We use a shared helper for this
 *    as the DMA setup must also adjust the PIO timing information.
 */

static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
}

/**
 *    atiixp_set_dmamode      -     set initial DMA mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called to do the DMA mode setup. We use timing tables for most
 *    modes but must tune an appropriate PIO mode to match.
 */

static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
      static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };

      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      int dma = adev->dma_mode;
      int dn = 2 * ap->port_no + adev->devno;
      int wanted_pio;

      if (adev->dma_mode >= XFER_UDMA_0) {
            u16 udma_mode_data;

            dma -= XFER_UDMA_0;

            pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
            udma_mode_data &= ~(0x7 << (4 * dn));
            udma_mode_data |= dma << (4 * dn);
            pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
      } else {
            u16 mwdma_timing_data;
            /* Check this is correct - the order is odd in both drivers */
            int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);

            dma -= XFER_MW_DMA_0;

            pci_read_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, &mwdma_timing_data);
            mwdma_timing_data &= ~(0xFF << timing_shift);
            mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
            pci_write_config_word(pdev, ATIIXP_IDE_MWDMA_TIMING, mwdma_timing_data);
      }
      /*
       *    We must now look at the PIO mode situation. We may need to
       *    adjust the PIO mode to keep the timings acceptable
       */
       if (adev->dma_mode >= XFER_MW_DMA_2)
            wanted_pio = 4;
      else if (adev->dma_mode == XFER_MW_DMA_1)
            wanted_pio = 3;
      else if (adev->dma_mode == XFER_MW_DMA_0)
            wanted_pio = 0;
      else BUG();

      if (adev->pio_mode != wanted_pio)
            atiixp_set_pio_timing(ap, adev, wanted_pio);
}

/**
 *    atiixp_bmdma_start      -     DMA start callback
 *    @qc: Command in progress
 *
 *    When DMA begins we need to ensure that the UDMA control
 *    register for the channel is correctly set.
 *
 *    Note: The host lock held by the libata layer protects
 *    us from two channels both trying to set DMA bits at once
 */

static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
{
      struct ata_port *ap = qc->ap;
      struct ata_device *adev = qc->dev;

      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      int dn = (2 * ap->port_no) + adev->devno;
      u16 tmp16;

      pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
      if (adev->dma_mode >= XFER_UDMA_0)
            tmp16 |= (1 << dn);
      else
            tmp16 &= ~(1 << dn);
      pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
      ata_bmdma_start(qc);
}

/**
 *    atiixp_dma_stop   -     DMA stop callback
 *    @qc: Command in progress
 *
 *    DMA has completed. Clear the UDMA flag as the next operations will
 *    be PIO ones not UDMA data transfer.
 *
 *    Note: The host lock held by the libata layer protects
 *    us from two channels both trying to set DMA bits at once
 */

static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
{
      struct ata_port *ap = qc->ap;
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      int dn = (2 * ap->port_no) + qc->dev->devno;
      u16 tmp16;

      pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
      tmp16 &= ~(1 << dn);
      pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
      ata_bmdma_stop(qc);
}

static struct scsi_host_template atiixp_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 atiixp_port_ops = {
      .set_piomode      = atiixp_set_piomode,
      .set_dmamode      = atiixp_set_dmamode,
      .mode_filter      = ata_pci_default_filter,
      .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    = atiixp_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = atiixp_cable_detect,

      .bmdma_setup      = ata_bmdma_setup,
      .bmdma_start      = atiixp_bmdma_start,
      .bmdma_stop = atiixp_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 atiixp_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht = &atiixp_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x06,     /* No MWDMA0 support */
            .udma_mask = 0x3F,
            .port_ops = &atiixp_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };
      return ata_pci_init_one(dev, ppi);
}

static const struct pci_device_id atiixp[] = {
      { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
      { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
      { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
      { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
      { PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },

      { },
};

static struct pci_driver atiixp_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = atiixp,
      .probe            = atiixp_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .resume           = ata_pci_device_resume,
      .suspend    = ata_pci_device_suspend,
#endif
};

static int __init atiixp_init(void)
{
      return pci_register_driver(&atiixp_pci_driver);
}


static void __exit atiixp_exit(void)
{
      pci_unregister_driver(&atiixp_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, atiixp);
MODULE_VERSION(DRV_VERSION);

module_init(atiixp_init);
module_exit(atiixp_exit);

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