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pata_ixp4xx_cf.c

/*
 * ixp4xx PATA/Compact Flash driver
 * Copyright (C) 2006-07 Tower Technologies
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * An ATA driver to handle a Compact Flash connected
 * to the ixp4xx expansion bus in TrueIDE mode. The CF
 * must have it chip selects connected to two CS lines
 * on the ixp4xx. In the irq is not available, you might
 * want to modify both this driver and libata to run in
 * polling mode.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/libata.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <scsi/scsi_host.h>

#define DRV_NAME  "pata_ixp4xx_cf"
#define DRV_VERSION     "0.2"

static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
{
      struct ata_device *dev;

      ata_link_for_each_dev(dev, link) {
            if (ata_dev_enabled(dev)) {
                  ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
                  dev->pio_mode = XFER_PIO_0;
                  dev->xfer_mode = XFER_PIO_0;
                  dev->xfer_shift = ATA_SHIFT_PIO;
                  dev->flags |= ATA_DFLAG_PIO;
            }
      }
      return 0;
}

static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
                        unsigned int buflen, int write_data)
{
      unsigned int i;
      unsigned int words = buflen >> 1;
      u16 *buf16 = (u16 *) buf;
      struct ata_port *ap = adev->link->ap;
      void __iomem *mmio = ap->ioaddr.data_addr;
      struct ixp4xx_pata_data *data = ap->host->dev->platform_data;

      /* set the expansion bus in 16bit mode and restore
       * 8 bit mode after the transaction.
       */
      *data->cs0_cfg &= ~(0x01);
      udelay(100);

      /* Transfer multiple of 2 bytes */
      if (write_data) {
            for (i = 0; i < words; i++)
                  writew(buf16[i], mmio);
      } else {
            for (i = 0; i < words; i++)
                  buf16[i] = readw(mmio);
      }

      /* Transfer trailing 1 byte, if any. */
      if (unlikely(buflen & 0x01)) {
            u16 align_buf[1] = { 0 };
            unsigned char *trailing_buf = buf + buflen - 1;

            if (write_data) {
                  memcpy(align_buf, trailing_buf, 1);
                  writew(align_buf[0], mmio);
            } else {
                  align_buf[0] = readw(mmio);
                  memcpy(trailing_buf, align_buf, 1);
            }
      }

      udelay(100);
      *data->cs0_cfg |= 0x01;
}

static struct scsi_host_template ixp4xx_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 ixp4xx_port_ops = {
      .set_mode         = ixp4xx_set_mode,
      .mode_filter            = ata_pci_default_filter,

      .tf_load          = ata_tf_load,
      .tf_read          = ata_tf_read,
      .exec_command           = ata_exec_command,
      .check_status           = ata_check_status,
      .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,

      .qc_prep          = ata_qc_prep,
      .qc_issue         = ata_qc_issue_prot,
      .data_xfer        = ixp4xx_mmio_data_xfer,
      .cable_detect           = ata_cable_40wire,

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

      .port_start       = ata_port_start,
};

static void ixp4xx_setup_port(struct ata_port *ap,
                        struct ixp4xx_pata_data *data,
                        unsigned long raw_cs0, unsigned long raw_cs1)
{
      struct ata_ioports *ioaddr = &ap->ioaddr;
      unsigned long raw_cmd = raw_cs0;
      unsigned long raw_ctl = raw_cs1 + 0x06;

      ioaddr->cmd_addr  = data->cs0;
      ioaddr->altstatus_addr  = data->cs1 + 0x06;
      ioaddr->ctl_addr  = data->cs1 + 0x06;

      ata_std_ports(ioaddr);

#ifndef __ARMEB__

      /* adjust the addresses to handle the address swizzling of the
       * ixp4xx in little endian mode.
       */

      *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
      *(unsigned long *)&ioaddr->cmd_addr       ^= 0x03;
      *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
      *(unsigned long *)&ioaddr->ctl_addr       ^= 0x03;
      *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
      *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
      *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
      *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
      *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
      *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
      *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
      *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
      *(unsigned long *)&ioaddr->command_addr         ^= 0x03;

      raw_cmd ^= 0x03;
      raw_ctl ^= 0x03;
#endif

      ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
}

static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
{
      unsigned int irq;
      struct resource *cs0, *cs1;
      struct ata_host *host;
      struct ata_port *ap;
      struct ixp4xx_pata_data *data = pdev->dev.platform_data;

      cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);

      if (!cs0 || !cs1)
            return -EINVAL;

      /* allocate host */
      host = ata_host_alloc(&pdev->dev, 1);
      if (!host)
            return -ENOMEM;

      /* acquire resources and fill host */
      pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;

      data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
      data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);

      if (!data->cs0 || !data->cs1)
            return -ENOMEM;

      irq = platform_get_irq(pdev, 0);
      if (irq)
            set_irq_type(irq, IRQT_RISING);

      /* Setup expansion bus chip selects */
      *data->cs0_cfg = data->cs0_bits;
      *data->cs1_cfg = data->cs1_bits;

      ap = host->ports[0];

      ap->ops     = &ixp4xx_port_ops;
      ap->pio_mask = 0x1f; /* PIO4 */
      ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;

      ixp4xx_setup_port(ap, data, cs0->start, cs1->start);

      dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");

      /* activate host */
      return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
}

static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
{
      struct ata_host *host = platform_get_drvdata(dev);

      ata_host_detach(host);

      return 0;
}

static struct platform_driver ixp4xx_pata_platform_driver = {
      .driver      = {
            .name   = DRV_NAME,
            .owner  = THIS_MODULE,
      },
      .probe            = ixp4xx_pata_probe,
      .remove           = __devexit_p(ixp4xx_pata_remove),
};

static int __init ixp4xx_pata_init(void)
{
      return platform_driver_register(&ixp4xx_pata_platform_driver);
}

static void __exit ixp4xx_pata_exit(void)
{
      platform_driver_unregister(&ixp4xx_pata_platform_driver);
}

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(ixp4xx_pata_init);
module_exit(ixp4xx_pata_exit);

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