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pata_qdi.c

/*
 *    pata_qdi.c - QDI VLB ATA controllers
 *    (C) 2006 Red Hat <alan@redhat.com>
 *
 * This driver mostly exists as a proof of concept for non PCI devices under
 * libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly
 * useful.
 *
 * Tuning code written from the documentation at
 * http://www.ryston.cz/petr/vlb/qd6500.html
 * http://www.ryston.cz/petr/vlb/qd6580.html
 *
 * Probe code based on drivers/ide/legacy/qd65xx.c
 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
 * Samuel Thibault <samuel.thibault@fnac.net>
 */

#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>
#include <linux/platform_device.h>

#define DRV_NAME "pata_qdi"
#define DRV_VERSION "0.3.1"

#define NR_HOST 4 /* Two 6580s */

struct qdi_data {
      unsigned long timing;
      u8 clock[2];
      u8 last;
      int fast;
      struct platform_device *platform_dev;

};

static struct ata_host *qdi_host[NR_HOST];
static struct qdi_data qdi_data[NR_HOST];
static int nr_qdi_host;

#ifdef MODULE
static int probe_qdi = 1;
#else
static int probe_qdi;
#endif

static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct ata_timing t;
      struct qdi_data *qdi = ap->host->private_data;
      int active, recovery;
      u8 timing;

      /* Get the timing data in cycles */
      ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

      if (qdi->fast) {
            active = 8 - FIT(t.active, 1, 8);
            recovery = 18 - FIT(t.recover, 3, 18);
      } else {
            active = 9 - FIT(t.active, 2, 9);
            recovery = 15 - FIT(t.recover, 0, 15);
      }
      timing = (recovery << 4) | active | 0x08;

      qdi->clock[adev->devno] = timing;

      outb(timing, qdi->timing);
}

static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct ata_timing t;
      struct qdi_data *qdi = ap->host->private_data;
      int active, recovery;
      u8 timing;

      /* Get the timing data in cycles */
      ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

      if (qdi->fast) {
            active = 8 - FIT(t.active, 1, 8);
            recovery = 18 - FIT(t.recover, 3, 18);
      } else {
            active = 9 - FIT(t.active, 2, 9);
            recovery = 15 - FIT(t.recover, 0, 15);
      }
      timing = (recovery << 4) | active | 0x08;

      qdi->clock[adev->devno] = timing;

      outb(timing, qdi->timing);

      /* Clear the FIFO */
      if (adev->class != ATA_DEV_ATA)
            outb(0x5F, (qdi->timing & 0xFFF0) + 3);
}

/**
 *    qdi_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.
 */

static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc)
{
      struct ata_port *ap = qc->ap;
      struct ata_device *adev = qc->dev;
      struct qdi_data *qdi = ap->host->private_data;

      if (qdi->clock[adev->devno] != qdi->last) {
            if (adev->pio_mode) {
                  qdi->last = qdi->clock[adev->devno];
                  outb(qdi->clock[adev->devno], qdi->timing);
            }
      }
      return ata_qc_issue_prot(qc);
}

static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
{
      struct ata_port *ap = adev->link->ap;
      int slop = buflen & 3;

      if (ata_id_has_dword_io(adev->id)) {
            if (write_data)
                  iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
            else
                  ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);

            if (unlikely(slop)) {
                  __le32 pad = 0;
                  if (write_data) {
                        memcpy(&pad, buf + buflen - slop, slop);
                        iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
                  } else {
                        pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
                        memcpy(buf + buflen - slop, &pad, slop);
                  }
            }
      } else
            ata_data_xfer(adev, buf, buflen, write_data);
}

static struct scsi_host_template qdi_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 qdi6500_port_ops = {
      .set_piomode      = qdi6500_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    = ata_bmdma_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = ata_cable_40wire,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = qdi_qc_issue_prot,

      .data_xfer  = qdi_data_xfer,

      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

static struct ata_port_operations qdi6580_port_ops = {
      .set_piomode      = qdi6580_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    = ata_bmdma_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = ata_cable_40wire,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = qdi_qc_issue_prot,

      .data_xfer  = qdi_data_xfer,

      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

/**
 *    qdi_init_one            -     attach a qdi interface
 *    @type: Type to display
 *    @io: I/O port start
 *    @irq: interrupt line
 *    @fast: True if on a > 33Mhz VLB
 *
 *    Register an ISA bus IDE interface. Such interfaces are PIO and we
 *    assume do not support IRQ sharing.
 */

static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast)
{
      unsigned long ctl = io + 0x206;
      struct platform_device *pdev;
      struct ata_host *host;
      struct ata_port *ap;
      void __iomem *io_addr, *ctl_addr;
      int ret;

      /*
       *    Fill in a probe structure first of all
       */

      pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
      if (IS_ERR(pdev))
            return PTR_ERR(pdev);

      ret = -ENOMEM;
      io_addr = devm_ioport_map(&pdev->dev, io, 8);
      ctl_addr = devm_ioport_map(&pdev->dev, ctl, 1);
      if (!io_addr || !ctl_addr)
            goto fail;

      ret = -ENOMEM;
      host = ata_host_alloc(&pdev->dev, 1);
      if (!host)
            goto fail;
      ap = host->ports[0];

      if (type == 6580) {
            ap->ops = &qdi6580_port_ops;
            ap->pio_mask = 0x1F;
            ap->flags |= ATA_FLAG_SLAVE_POSS;
      } else {
            ap->ops = &qdi6500_port_ops;
            ap->pio_mask = 0x07;    /* Actually PIO3 !IORDY is possible */
            ap->flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
      }

      ap->ioaddr.cmd_addr = io_addr;
      ap->ioaddr.altstatus_addr = ctl_addr;
      ap->ioaddr.ctl_addr = ctl_addr;
      ata_std_ports(&ap->ioaddr);

      ata_port_desc(ap, "cmd %lx ctl %lx", io, ctl);

      /*
       *    Hook in a private data structure per channel
       */
      ap->private_data = &qdi_data[nr_qdi_host];

      qdi_data[nr_qdi_host].timing = port;
      qdi_data[nr_qdi_host].fast = fast;
      qdi_data[nr_qdi_host].platform_dev = pdev;

      printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io);

      /* activate */
      ret = ata_host_activate(host, irq, ata_interrupt, 0, &qdi_sht);
      if (ret)
            goto fail;

      qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev);
      return 0;

 fail:
      platform_device_unregister(pdev);
      return ret;
}

/**
 *    qdi_init          -     attach qdi interfaces
 *
 *    Attach qdi IDE interfaces by scanning the ports it may occupy.
 */

static __init int qdi_init(void)
{
      unsigned long flags;
      static const unsigned long qd_port[2] = { 0x30, 0xB0 };
      static const unsigned long ide_port[2] = { 0x170, 0x1F0 };
      static const int ide_irq[2] = { 14, 15 };

      int ct = 0;
      int i;

      if (probe_qdi == 0)
            return -ENODEV;

      /*
       *    Check each possible QD65xx base address
       */

      for (i = 0; i < 2; i++) {
            unsigned long port = qd_port[i];
            u8 r, res;


            if (request_region(port, 2, "pata_qdi")) {
                  /* Check for a card */
                  local_irq_save(flags);
                  r = inb_p(port);
                  outb_p(0x19, port);
                  res = inb_p(port);
                  outb_p(r, port);
                  local_irq_restore(flags);

                  /* Fail */
                  if (res == 0x19)
                  {
                        release_region(port, 2);
                        continue;
                  }

                  /* Passes the presence test */
                  r = inb_p(port + 1);    /* Check port agrees with port set */
                  if ((r & 2) >> 1 != i) {
                        release_region(port, 2);
                        continue;
                  }

                  /* Check card type */
                  if ((r & 0xF0) == 0xC0) {
                        /* QD6500: single channel */
                        if (r & 8) {
                              /* Disabled ? */
                              release_region(port, 2);
                              continue;
                        }
                        if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
                              ct++;
                  }
                  if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) {
                        /* QD6580: dual channel */
                        if (!request_region(port + 2 , 2, "pata_qdi"))
                        {
                              release_region(port, 2);
                              continue;
                        }
                        res = inb(port + 3);
                        if (res & 1) {
                              /* Single channel mode */
                              if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
                                    ct++;
                        } else {
                              /* Dual channel mode */
                              if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0)
                                    ct++;
                              if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0)
                                    ct++;
                        }
                  }
            }
      }
      if (ct != 0)
            return 0;
      return -ENODEV;
}

static __exit void qdi_exit(void)
{
      int i;

      for (i = 0; i < nr_qdi_host; i++) {
            ata_host_detach(qdi_host[i]);
            /* Free the control resource. The 6580 dual channel has the resources
             * claimed as a pair of 2 byte resources so we need no special cases...
             */
            release_region(qdi_data[i].timing, 2);
            platform_device_unregister(qdi_data[i].platform_dev);
      }
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for qdi ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(qdi_init);
module_exit(qdi_exit);

module_param(probe_qdi, int, 0);


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