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pata_opti.c

/*
 * pata_opti.c    - ATI PATA for new ATA layer
 *                  (C) 2005 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 * Based on
 *  linux/drivers/ide/pci/opti621.c       Version 0.7 Sept 10, 2002
 *
 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
 *
 * Authors:
 * Jaromir Koutek <miri@punknet.cz>,
 * Jan Harkes <jaharkes@cwi.nl>,
 * Mark Lord <mlord@pobox.com>
 * Some parts of code are from ali14xx.c and from rz1000.c.
 *
 * Also consulted the FreeBSD prototype driver by Kevin Day to try
 * and resolve some confusions. Further documentation can be found in
 * Ralf Brown's interrupt list
 *
 * If you have other variants of the Opti range (Viper/Vendetta) please
 * try this driver with those PCI idents and report back. For the later
 * chips see the pata_optidma driver
 *
 */

#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_opti"
#define DRV_VERSION "0.2.9"

enum {
      READ_REG    = 0,  /* index of Read cycle timing register */
      WRITE_REG   = 1,  /* index of Write cycle timing register */
      CNTRL_REG   = 3,  /* index of Control register */
      STRAP_REG   = 5,  /* index of Strap register */
      MISC_REG    = 6   /* index of Miscellaneous register */
};

/**
 *    opti_pre_reset          -     probe begin
 *    @link: ATA link
 *    @deadline: deadline jiffies for the operation
 *
 *    Set up cable type and use generic probe init
 */

static int opti_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 opti_enable_bits[] = {
            { 0x45, 1, 0x80, 0x00 },
            { 0x40, 1, 0x08, 0x00 }
      };

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

      return ata_std_prereset(link, deadline);
}

/**
 *    opti_probe_reset        -     probe reset
 *    @ap: ATA port
 *
 *    Perform the ATA probe and bus reset sequence plus specific handling
 *    for this hardware. The Opti needs little handling - we have no UDMA66
 *    capability that needs cable detection. All we must do is check the port
 *    is enabled.
 */

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

/**
 *    opti_write_reg          -     control register setup
 *    @ap: ATA port
 *    @value: value
 *    @reg: control register number
 *
 *    The Opti uses magic 'trapdoor' register accesses to do configuration
 *    rather than using PCI space as other controllers do. The double inw
 *    on the error register activates configuration mode. We can then write
 *    the control register
 */

static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
{
      void __iomem *regio = ap->ioaddr.cmd_addr;

      /* These 3 unlock the control register access */
      ioread16(regio + 1);
      ioread16(regio + 1);
      iowrite8(3, regio + 2);

      /* Do the I/O */
      iowrite8(val, regio + reg);

      /* Relock */
      iowrite8(0x83, regio + 2);
}

/**
 *    opti_set_piomode  -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Called to do the PIO mode setup. Timing numbers are taken from
 *    the FreeBSD driver then pre computed to keep the code clean. There
 *    are two tables depending on the hardware clock speed.
 */

static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct ata_device *pair = ata_dev_pair(adev);
      int clock;
      int pio = adev->pio_mode - XFER_PIO_0;
      void __iomem *regio = ap->ioaddr.cmd_addr;
      u8 addr;

      /* Address table precomputed with prefetch off and a DCLK of 2 */
      static const u8 addr_timing[2][5] = {
            { 0x30, 0x20, 0x20, 0x10, 0x10 },
            { 0x20, 0x20, 0x10, 0x10, 0x10 }
      };
      static const u8 data_rec_timing[2][5] = {
            { 0x6B, 0x56, 0x42, 0x32, 0x31 },
            { 0x58, 0x44, 0x32, 0x22, 0x21 }
      };

      iowrite8(0xff, regio + 5);
      clock = ioread16(regio + 5) & 1;

      /*
       *    As with many controllers the address setup time is shared
       *    and must suit both devices if present.
       */

      addr = addr_timing[clock][pio];
      if (pair) {
            /* Hardware constraint */
            u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
            if (pair_addr > addr)
                  addr = pair_addr;
      }

      /* Commence primary programming sequence */
      opti_write_reg(ap, adev->devno, MISC_REG);
      opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
      opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
      opti_write_reg(ap, addr, MISC_REG);

      /* Programming sequence complete, override strapping */
      opti_write_reg(ap, 0x85, CNTRL_REG);
}

static struct scsi_host_template opti_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 opti_port_ops = {
      .set_piomode      = opti_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    = opti_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 opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht = &opti_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .port_ops = &opti_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };
      static int printed_version;

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

      return ata_pci_init_one(dev, ppi);
}

static const struct pci_device_id opti[] = {
      { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
      { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },

      { },
};

static struct pci_driver opti_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = opti,
      .probe            = opti_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = ata_pci_device_resume,
#endif
};

static int __init opti_init(void)
{
      return pci_register_driver(&opti_pci_driver);
}

static void __exit opti_exit(void)
{
      pci_unregister_driver(&opti_pci_driver);
}


MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, opti);
MODULE_VERSION(DRV_VERSION);

module_init(opti_init);
module_exit(opti_exit);

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