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pata_rz1000.c

/*
 *  RZ1000/1001 driver based upon
 *
 *  linux/drivers/ide/pci/rz1000.c  Version 0.06      January 12, 2003
 *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
 *  Principal Author:  mlord@pobox.com (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for disabling the buggy read-ahead
 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
 */

#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_rz1000"
#define DRV_VERSION     "0.2.4"


/**
 *    rz1000_set_mode         -     mode setting function
 *    @link: ATA link
 *    @unused: returned device on set_mode failure
 *
 *    Use a non standard set_mode function. We don't want to be tuned. We
 *    would prefer to be BIOS generic but for the fact our hardware is
 *    whacked out.
 */

static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
{
      struct ata_device *dev;

      ata_link_for_each_dev(dev, link) {
            if (ata_dev_enabled(dev)) {
                  /* We don't really care */
                  dev->pio_mode = XFER_PIO_0;
                  dev->xfer_mode = XFER_PIO_0;
                  dev->xfer_shift = ATA_SHIFT_PIO;
                  dev->flags |= ATA_DFLAG_PIO;
                  ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
            }
      }
      return 0;
}


static struct scsi_host_template rz1000_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 rz1000_port_ops = {
      .set_mode   = rz1000_set_mode,

      .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,

      .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,

      .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,

      .irq_handler      = ata_interrupt,
      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

static int rz1000_fifo_disable(struct pci_dev *pdev)
{
      u16 reg;
      /* Be exceptionally paranoid as we must be sure to apply the fix */
      if (pci_read_config_word(pdev, 0x40, &reg) != 0)
            return -1;
      reg &= 0xDFFF;
      if (pci_write_config_word(pdev, 0x40, reg) != 0)
            return -1;
      printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
      return 0;
}

/**
 *    rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 *    @pdev: PCI device to register
 *    @ent: Entry in rz1000_pci_tbl matching with @pdev
 *
 *    Configure an RZ1000 interface. This doesn't require much special
 *    handling except that we *MUST* kill the chipset readahead or the
 *    user may experience data corruption.
 */

static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
      static int printed_version;
      static const struct ata_port_info info = {
            .sht = &rz1000_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .port_ops = &rz1000_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };

      if (!printed_version++)
            printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");

      if (rz1000_fifo_disable(pdev) == 0)
            return ata_pci_init_one(pdev, ppi);

      printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
      /* Not safe to use so skip */
      return -ENODEV;
}

#ifdef CONFIG_PM
static int rz1000_reinit_one(struct pci_dev *pdev)
{
      /* If this fails on resume (which is a "cant happen" case), we
         must stop as any progress risks data loss */
      if (rz1000_fifo_disable(pdev))
            panic("rz1000 fifo");
      return ata_pci_device_resume(pdev);
}
#endif

static const struct pci_device_id pata_rz1000[] = {
      { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
      { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },

      { },
};

static struct pci_driver rz1000_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = pata_rz1000,
      .probe            = rz1000_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = rz1000_reinit_one,
#endif
};

static int __init rz1000_init(void)
{
      return pci_register_driver(&rz1000_pci_driver);
}

static void __exit rz1000_exit(void)
{
      pci_unregister_driver(&rz1000_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_rz1000);
MODULE_VERSION(DRV_VERSION);

module_init(rz1000_init);
module_exit(rz1000_exit);


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