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pata_cmd640.c

/*
 * pata_cmd640.c  - CMD640 PCI PATA for new ATA layer
 *                  (C) 2007 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 * Based upon
 *  linux/drivers/ide/pci/cmd640.c        Version 1.02  Sep 01, 1996
 *
 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see driver)
 *
 *    This drives only the PCI version of the controller. If you have a
 *    VLB one then we have enough docs to support it but you can write
 *    your own code.
 */

#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_cmd640"
#define DRV_VERSION "0.0.5"

struct cmd640_reg {
      int last;
      u8 reg58[ATA_MAX_DEVICES];
};

enum {
      CFR = 0x50,
      CNTRL = 0x51,
      CMDTIM = 0x52,
      ARTIM0 = 0x53,
      DRWTIM0 = 0x54,
      ARTIM23 = 0x57,
      DRWTIM23 = 0x58,
      BRST = 0x59
};

/**
 *    cmd640_set_piomode      -     set initial PIO mode data
 *    @ap: ATA port
 *    @adev: ATA device
 *
 *    Called to do the PIO mode setup.
 */

static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct cmd640_reg *timing = ap->private_data;
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      struct ata_timing t;
      const unsigned long T = 1000000 / 33;
      const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
      u8 reg;
      int arttim = ARTIM0 + 2 * adev->devno;
      struct ata_device *pair = ata_dev_pair(adev);

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

      /* The second channel has shared timings and the setup timing is
         messy to switch to merge it for worst case */
      if (ap->port_no && pair) {
            struct ata_timing p;
            ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
            ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
      }

      /* Make the timings fit */
      if (t.recover > 16) {
            t.active += t.recover - 16;
            t.recover = 16;
      }
      if (t.active > 16)
            t.active = 16;

      /* Now convert the clocks into values we can actually stuff into
         the chip */

      if (t.recover > 1)
            t.recover--;      /* 640B only */
      else
            t.recover = 15;

      if (t.setup > 4)
            t.setup = 0xC0;
      else
            t.setup = setup_data[t.setup];

      if (ap->port_no == 0) {
            t.active &= 0x0F; /* 0 = 16 */

            /* Load setup timing */
            pci_read_config_byte(pdev, arttim, &reg);
            reg &= 0x3F;
            reg |= t.setup;
            pci_write_config_byte(pdev, arttim, reg);

            /* Load active/recovery */
            pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
      } else {
            /* Save the shared timings for channel, they will be loaded
               by qc_issue_prot. Reloading the setup time is expensive
               so we keep a merged one loaded */
            pci_read_config_byte(pdev, ARTIM23, &reg);
            reg &= 0x3F;
            reg |= t.setup;
            pci_write_config_byte(pdev, ARTIM23, reg);
            timing->reg58[adev->devno] = (t.active << 4) | t.recover;
      }
}


/**
 *    cmd640_qc_issue_prot    -     command preparation hook
 *    @qc: Command to be issued
 *
 *    Channel 1 has shared timings. We must reprogram the
 *    clock each drive 2/3 switch we do.
 */

static unsigned int cmd640_qc_issue_prot(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);
      struct cmd640_reg *timing = ap->private_data;

      if (ap->port_no != 0 && adev->devno != timing->last) {
            pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
            timing->last = adev->devno;
      }
      return ata_qc_issue_prot(qc);
}

/**
 *    cmd640_port_start -     port setup
 *    @ap: ATA port being set up
 *
 *    The CMD640 needs to maintain private data structures so we
 *    allocate space here.
 */

static int cmd640_port_start(struct ata_port *ap)
{
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      struct cmd640_reg *timing;

      int ret = ata_sff_port_start(ap);
      if (ret < 0)
            return ret;

      timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
      if (timing == NULL)
            return -ENOMEM;
      timing->last = -1;      /* Force a load */
      ap->private_data = timing;
      return ret;
}

static struct scsi_host_template cmd640_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 cmd640_port_ops = {
      .set_piomode      = cmd640_set_piomode,
      .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   = cmd640_qc_issue_prot,

      /* In theory this is not needed once we kill the prefetcher */
      .data_xfer  = ata_data_xfer_noirq,

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

      .port_start = cmd640_port_start,
};

static void cmd640_hardware_init(struct pci_dev *pdev)
{
      u8 r;
      u8 ctrl;

      /* CMD640 detected, commiserations */
      pci_write_config_byte(pdev, 0x5B, 0x00);
      /* Get version info */
      pci_read_config_byte(pdev, CFR, &r);
      /* PIO0 command cycles */
      pci_write_config_byte(pdev, CMDTIM, 0);
      /* 512 byte bursts (sector) */
      pci_write_config_byte(pdev, BRST, 0x40);
      /*
       * A reporter a long time ago
       * Had problems with the data fifo
       * So don't run the risk
       * Of putting crap on the disk
       * For its better just to go slow
       */
      /* Do channel 0 */
      pci_read_config_byte(pdev, CNTRL, &ctrl);
      pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
      /* Ditto for channel 1 */
      pci_read_config_byte(pdev, ARTIM23, &ctrl);
      ctrl |= 0x0C;
      pci_write_config_byte(pdev, ARTIM23, ctrl);
}

static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht = &cmd640_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .port_ops = &cmd640_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };

      cmd640_hardware_init(pdev);
      return ata_pci_init_one(pdev, ppi);
}

static int cmd640_reinit_one(struct pci_dev *pdev)
{
      cmd640_hardware_init(pdev);
#ifdef CONFIG_PM
      return ata_pci_device_resume(pdev);
#else
      return 0;
#endif
}

static const struct pci_device_id cmd640[] = {
      { PCI_VDEVICE(CMD, 0x640), 0 },
      { },
};

static struct pci_driver cmd640_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = cmd640,
      .probe            = cmd640_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
#endif
      .resume           = cmd640_reinit_one,
};

static int __init cmd640_init(void)
{
      return pci_register_driver(&cmd640_pci_driver);
}

static void __exit cmd640_exit(void)
{
      pci_unregister_driver(&cmd640_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cmd640);
MODULE_VERSION(DRV_VERSION);

module_init(cmd640_init);
module_exit(cmd640_exit);

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