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pata_cypress.c

/*
 * pata_cypress.c       - Cypress PATA for new ATA layer
 *                  (C) 2006 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 * Based heavily on
 * linux/drivers/ide/pci/cy82c693.c       Version 0.40      Sep. 10, 2002
 *
 */

#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_cypress"
#define DRV_VERSION "0.1.5"

/* here are the offset definitions for the registers */

enum {
      CY82_IDE_CMDREG         = 0x04,
      CY82_IDE_ADDRSETUP      = 0x48,
      CY82_IDE_MASTER_IOR     = 0x4C,
      CY82_IDE_MASTER_IOW     = 0x4D,
      CY82_IDE_SLAVE_IOR      = 0x4E,
      CY82_IDE_SLAVE_IOW      = 0x4F,
      CY82_IDE_MASTER_8BIT    = 0x50,
      CY82_IDE_SLAVE_8BIT     = 0x51,

      CY82_INDEX_PORT         = 0x22,
      CY82_DATA_PORT          = 0x23,

      CY82_INDEX_CTRLREG1     = 0x01,
      CY82_INDEX_CHANNEL0     = 0x30,
      CY82_INDEX_CHANNEL1     = 0x31,
      CY82_INDEX_TIMEOUT      = 0x32
};

/**
 *    cy82c693_set_piomode    -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called to do the PIO mode setup.
 */

static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      struct ata_timing t;
      const unsigned long T = 1000000 / 33;
      short time_16, time_8;
      u32 addr;

      if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
            printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
            return;
      }

      time_16 = FIT(t.recover, 0, 15) | (FIT(t.active, 0, 15) << 4);
      time_8 = FIT(t.act8b, 0, 15) | (FIT(t.rec8b, 0, 15) << 4);

      if (adev->devno == 0) {
            pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

            addr &= ~0x0F;    /* Mask bits */
            addr |= FIT(t.setup, 0, 15);

            pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
            pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
            pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
            pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
      } else {
            pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

            addr &= ~0xF0;    /* Mask bits */
            addr |= (FIT(t.setup, 0, 15) << 4);

            pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
            pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
            pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
            pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
      }
}

/**
 *    cy82c693_set_dmamode    -     set initial DMA mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called to do the DMA mode setup.
 */

static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
      int reg = CY82_INDEX_CHANNEL0 + ap->port_no;

      /* Be afraid, be very afraid. Magic registers  in low I/O space */
      outb(reg, 0x22);
      outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);

      /* 0x50 gives the best behaviour on the Alpha's using this chip */
      outb(CY82_INDEX_TIMEOUT, 0x22);
      outb(0x50, 0x23);
}

static struct scsi_host_template cy82c693_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 cy82c693_port_ops = {
      .set_piomode      = cy82c693_set_piomode,
      .set_dmamode      = cy82c693_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_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 cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht = &cy82c693_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .port_ops = &cy82c693_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

      /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
         For the moment we don't handle the secondary. FIXME */

      if (PCI_FUNC(pdev->devfn) != 1)
            return -ENODEV;

      return ata_pci_init_one(pdev, ppi);
}

static const struct pci_device_id cy82c693[] = {
      { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },

      { },
};

static struct pci_driver cy82c693_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = cy82c693,
      .probe            = cy82c693_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = ata_pci_device_resume,
#endif
};

static int __init cy82c693_init(void)
{
      return pci_register_driver(&cy82c693_pci_driver);
}


static void __exit cy82c693_exit(void)
{
      pci_unregister_driver(&cy82c693_pci_driver);
}


MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cy82c693);
MODULE_VERSION(DRV_VERSION);

module_init(cy82c693_init);
module_exit(cy82c693_exit);

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