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pata_winbond.c

/*
 *    pata_winbond.c - Winbond VLB ATA controllers
 *    (C) 2006 Red Hat <alan@redhat.com>
 *
 *    Support for the Winbond 83759A when operating in advanced mode.
 *    Multichip mode is not currently supported.
 */

#include <linux/kernel.h>
#include <linux/module.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_winbond"
#define DRV_VERSION "0.0.3"

#define NR_HOST 4 /* Two winbond controllers, two channels each */

struct winbond_data {
      unsigned long config;
      struct platform_device *platform_dev;
};

static struct ata_host *winbond_host[NR_HOST];
static struct winbond_data winbond_data[NR_HOST];
static int nr_winbond_host;

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

static DEFINE_SPINLOCK(winbond_lock);

static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
{
      unsigned long flags;
      spin_lock_irqsave(&winbond_lock, flags);
      outb(reg, port + 0x01);
      outb(val, port + 0x02);
      spin_unlock_irqrestore(&winbond_lock, flags);
}

static u8 winbond_readcfg(unsigned long port, u8 reg)
{
      u8 val;

      unsigned long flags;
      spin_lock_irqsave(&winbond_lock, flags);
      outb(reg, port + 0x01);
      val = inb(port + 0x02);
      spin_unlock_irqrestore(&winbond_lock, flags);

      return val;
}

static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      struct ata_timing t;
      struct winbond_data *winbond = ap->host->private_data;
      int active, recovery;
      u8 reg;
      int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);

      reg = winbond_readcfg(winbond->config, 0x81);

      /* Get the timing data in cycles */
      if (reg & 0x40)         /* Fast VLB bus, assume 50MHz */
            ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
      else
            ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);

      active = (FIT(t.active, 3, 17) - 1) & 0x0F;
      recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F;
      timing = (active << 4) | recovery;
      winbond_writecfg(winbond->config, timing, reg);

      /* Load the setup timing */

      reg = 0x35;
      if (adev->class != ATA_DEV_ATA)
            reg |= 0x08;      /* FIFO off */
      if (!ata_pio_need_iordy(adev))
            reg |= 0x02;      /* IORDY off */
      reg |= (FIT(t.setup, 0, 3) << 6);
      winbond_writecfg(winbond->config, timing + 1, reg);
}


static void winbond_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 winbond_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 winbond_port_ops = {
      .set_piomode      = winbond_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   = ata_qc_issue_prot,

      .data_xfer  = winbond_data_xfer,

      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

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

static __init int winbond_init_one(unsigned long port)
{
      struct platform_device *pdev;
      u8 reg;
      int i, rc;

      reg = winbond_readcfg(port, 0x81);
      reg |= 0x80;      /* jumpered mode off */
      winbond_writecfg(port, 0x81, reg);
      reg = winbond_readcfg(port, 0x83);
      reg |= 0xF0;      /* local control */
      winbond_writecfg(port, 0x83, reg);
      reg = winbond_readcfg(port, 0x85);
      reg |= 0xF0;      /* programmable timing */
      winbond_writecfg(port, 0x85, reg);

      reg = winbond_readcfg(port, 0x81);

      if (!(reg & 0x03))            /* Disabled */
            return 0;

      for (i = 0; i < 2 ; i ++) {
            unsigned long cmd_port = 0x1F0 - (0x80 * i);
            unsigned long ctl_port = cmd_port + 0x206;
            struct ata_host *host;
            struct ata_port *ap;
            void __iomem *cmd_addr, *ctl_addr;

            if (!(reg & (1 << i)))
                  continue;

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

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

            rc = -ENOMEM;
            cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);
            ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);
            if (!cmd_addr || !ctl_addr)
                  goto err_unregister;

            ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);

            ap->ops = &winbond_port_ops;
            ap->pio_mask = 0x1F;
            ap->flags |= ATA_FLAG_SLAVE_POSS;
            ap->ioaddr.cmd_addr = cmd_addr;
            ap->ioaddr.altstatus_addr = ctl_addr;
            ap->ioaddr.ctl_addr = ctl_addr;
            ata_std_ports(&ap->ioaddr);

            /* hook in a private data structure per channel */
            host->private_data = &winbond_data[nr_winbond_host];
            winbond_data[nr_winbond_host].config = port;
            winbond_data[nr_winbond_host].platform_dev = pdev;

            /* activate */
            rc = ata_host_activate(host, 14 + i, ata_interrupt, 0,
                               &winbond_sht);
            if (rc)
                  goto err_unregister;

            winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
      }

      return 0;

 err_unregister:
      platform_device_unregister(pdev);
      return rc;
}

/**
 *    winbond_init            -     attach winbond interfaces
 *
 *    Attach winbond IDE interfaces by scanning the ports it may occupy.
 */

static __init int winbond_init(void)
{
      static const unsigned long config[2] = { 0x130, 0x1B0 };

      int ct = 0;
      int i;

      if (probe_winbond == 0)
            return -ENODEV;

      /*
       *    Check both base addresses
       */

      for (i = 0; i < 2; i++) {
            if (probe_winbond & (1<<i)) {
                  int ret = 0;
                  unsigned long port = config[i];

                  if (request_region(port, 2, "pata_winbond")) {
                        ret = winbond_init_one(port);
                        if (ret <= 0)
                              release_region(port, 2);
                        else ct+= ret;
                  }
            }
      }
      if (ct != 0)
            return 0;
      return -ENODEV;
}

static __exit void winbond_exit(void)
{
      int i;

      for (i = 0; i < nr_winbond_host; i++) {
            ata_host_detach(winbond_host[i]);
            release_region(winbond_data[i].config, 2);
            platform_device_unregister(winbond_data[i].platform_dev);
      }
}

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

module_init(winbond_init);
module_exit(winbond_exit);

module_param(probe_winbond, int, 0);


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