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pata_radisys.c

/*
 *    pata_radisys.c - Intel PATA/SATA controllers
 *
 *    (C) 2006 Red Hat <alan@redhat.com>
 *
 *    Some parts based on ata_piix.c by Jeff Garzik and others.
 *
 *    A PIIX relative, this device has a single ATA channel and no
 *    slave timings, SITRE or PPE. In that sense it is a close relative
 *    of the original PIIX. It does however support UDMA 33/66 per channel
 *    although no other modes/timings. Also lacking is 32bit I/O on the ATA
 *    port.
 */

#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 <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>

#define DRV_NAME  "pata_radisys"
#define DRV_VERSION     "0.4.4"

/**
 *    radisys_set_piomode - Initialize host controller PATA PIO timings
 *    @ap: ATA port
 *    @adev: Device whose timings we are configuring
 *
 *    Set PIO mode for device, in host controller PCI config space.
 *
 *    LOCKING:
 *    None (inherited from caller).
 */

static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
      unsigned int pio  = adev->pio_mode - XFER_PIO_0;
      struct pci_dev *dev     = to_pci_dev(ap->host->dev);
      u16 idetm_data;
      int control = 0;

      /*
       *    See Intel Document 298600-004 for the timing programing rules
       *    for PIIX/ICH. Note that the early PIIX does not have the slave
       *    timing port at 0x44. The Radisys is a relative of the PIIX
       *    but not the same so be careful.
       */

      static const       /* ISP  RTC */
      u8 timings[][2]   = { { 0, 0 },     /* Check me */
                      { 0, 0 },
                      { 1, 1 },
                      { 2, 2 },
                      { 3, 3 }, };

      if (pio > 0)
            control |= 1;     /* TIME1 enable */
      if (ata_pio_need_iordy(adev))
            control |= 2;     /* IE IORDY */

      pci_read_config_word(dev, 0x40, &idetm_data);

      /* Enable IE and TIME as appropriate. Clear the other
         drive timing bits */
      idetm_data &= 0xCCCC;
      idetm_data |= (control << (4 * adev->devno));
      idetm_data |= (timings[pio][0] << 12) |
                  (timings[pio][1] << 8);
      pci_write_config_word(dev, 0x40, idetm_data);

      /* Track which port is configured */
      ap->private_data = adev;
}

/**
 *    radisys_set_dmamode - Initialize host controller PATA DMA timings
 *    @ap: Port whose timings we are configuring
 *    @adev: Device to program
 *    @isich: True if the device is an ICH and has IOCFG registers
 *
 *    Set MWDMA mode for device, in host controller PCI config space.
 *
 *    LOCKING:
 *    None (inherited from caller).
 */

static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
      struct pci_dev *dev     = to_pci_dev(ap->host->dev);
      u16 idetm_data;
      u8 udma_enable;

      static const       /* ISP  RTC */
      u8 timings[][2]   = { { 0, 0 },
                      { 0, 0 },
                      { 1, 1 },
                      { 2, 2 },
                      { 3, 3 }, };

      /*
       * MWDMA is driven by the PIO timings. We must also enable
       * IORDY unconditionally.
       */

      pci_read_config_word(dev, 0x40, &idetm_data);
      pci_read_config_byte(dev, 0x48, &udma_enable);

      if (adev->dma_mode < XFER_UDMA_0) {
            unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
            const unsigned int needed_pio[3] = {
                  XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
            };
            int pio = needed_pio[mwdma] - XFER_PIO_0;
            int control = 3;  /* IORDY|TIME0 */

            /* If the drive MWDMA is faster than it can do PIO then
               we must force PIO0 for PIO cycles. */

            if (adev->pio_mode < needed_pio[mwdma])
                  control = 1;

            /* Mask out the relevant control and timing bits we will load. Also
               clear the other drive TIME register as a precaution */

            idetm_data &= 0xCCCC;
            idetm_data |= control << (4 * adev->devno);
            idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);

            udma_enable &= ~(1 << adev->devno);
      } else {
            u8 udma_mode;

            /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */

            pci_read_config_byte(dev, 0x4A, &udma_mode);

            if (adev->xfer_mode == XFER_UDMA_2)
                  udma_mode &= ~ (1 << adev->devno);
            else /* UDMA 4 */
                  udma_mode |= (1 << adev->devno);

            pci_write_config_byte(dev, 0x4A, udma_mode);

            udma_enable |= (1 << adev->devno);
      }
      pci_write_config_word(dev, 0x40, idetm_data);
      pci_write_config_byte(dev, 0x48, udma_enable);

      /* Track which port is configured */
      ap->private_data = adev;
}

/**
 *    radisys_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. Our logic also clears TIME0/TIME1 for the other device so
 *    that, even if we get this wrong, cycles to the other device will
 *    be made PIO0.
 */

static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc)
{
      struct ata_port *ap = qc->ap;
      struct ata_device *adev = qc->dev;

      if (adev != ap->private_data) {
            /* UDMA timing is not shared */
            if (adev->dma_mode < XFER_UDMA_0) {
                  if (adev->dma_mode)
                        radisys_set_dmamode(ap, adev);
                  else if (adev->pio_mode)
                        radisys_set_piomode(ap, adev);
            }
      }
      return ata_qc_issue_prot(qc);
}


static struct scsi_host_template radisys_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 const struct ata_port_operations radisys_pata_ops = {
      .set_piomode            = radisys_set_piomode,
      .set_dmamode            = radisys_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          = ata_bmdma_error_handler,
      .post_internal_cmd      = ata_bmdma_post_internal_cmd,
      .cable_detect           = ata_cable_unknown,

      .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         = radisys_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,
};


/**
 *    radisys_init_one - Register PIIX ATA PCI device with kernel services
 *    @pdev: PCI device to register
 *    @ent: Entry in radisys_pci_tbl matching with @pdev
 *
 *    Called from kernel PCI layer.  We probe for combined mode (sigh),
 *    and then hand over control to libata, for it to do the rest.
 *
 *    LOCKING:
 *    Inherited from PCI layer (may sleep).
 *
 *    RETURNS:
 *    Zero on success, or -ERRNO value.
 */

static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
      static int printed_version;
      static const struct ata_port_info info = {
            .sht        = &radisys_sht,
            .flags            = ATA_FLAG_SLAVE_POSS,
            .pio_mask   = 0x1f,     /* pio0-4 */
            .mwdma_mask = 0x07, /* mwdma1-2 */
            .udma_mask  = 0x14, /* UDMA33/66 only */
            .port_ops   = &radisys_pata_ops,
      };
      const struct ata_port_info *ppi[] = { &info, NULL };

      if (!printed_version++)
            dev_printk(KERN_DEBUG, &pdev->dev,
                     "version " DRV_VERSION "\n");

      return ata_pci_init_one(pdev, ppi);
}

static const struct pci_device_id radisys_pci_tbl[] = {
      { PCI_VDEVICE(RADISYS, 0x8201), },

      { }   /* terminate list */
};

static struct pci_driver radisys_pci_driver = {
      .name             = DRV_NAME,
      .id_table         = radisys_pci_tbl,
      .probe                  = radisys_init_one,
      .remove                 = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend          = ata_pci_device_suspend,
      .resume                 = ata_pci_device_resume,
#endif
};

static int __init radisys_init(void)
{
      return pci_register_driver(&radisys_pci_driver);
}

static void __exit radisys_exit(void)
{
      pci_unregister_driver(&radisys_pci_driver);
}

module_init(radisys_init);
module_exit(radisys_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
MODULE_VERSION(DRV_VERSION);


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