drivers/ata/pata_ixp4xx_cf.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * 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.
  */

 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/libata.h>
 #include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <scsi/scsi_host.h>

 #define DRV_NAME	"pata_ixp4xx_cf"
 #define DRV_VERSION	"1.0"

 struct ixp4xx_pata {
 	struct ata_host *host;
 	struct regmap *rmap;
 	u32 cmd_csreg;
 	void __iomem *cmd;
 	void __iomem *ctl;
 };

 #define IXP4XX_EXP_TIMING_STRIDE	0x04
 /* The timings for the chipselect is in bits 29..16 */
 #define IXP4XX_EXP_T1_T5_MASK	GENMASK(29, 16)
 #define IXP4XX_EXP_PIO_0_8	0x0a470000
 #define IXP4XX_EXP_PIO_1_8	0x06430000
 #define IXP4XX_EXP_PIO_2_8	0x02410000
 #define IXP4XX_EXP_PIO_3_8	0x00820000
 #define IXP4XX_EXP_PIO_4_8	0x00400000
 #define IXP4XX_EXP_PIO_0_16	0x29640000
 #define IXP4XX_EXP_PIO_1_16	0x05030000
 #define IXP4XX_EXP_PIO_2_16	0x00b20000
 #define IXP4XX_EXP_PIO_3_16	0x00820000
 #define IXP4XX_EXP_PIO_4_16	0x00400000
 #define IXP4XX_EXP_BW_MASK	(BIT(6)|BIT(0))
 #define IXP4XX_EXP_BYTE_RD16	BIT(6) /* Byte reads on half-word devices */
 #define IXP4XX_EXP_BYTE_EN	BIT(0) /* Use 8bit data bus if set */

 static void ixp4xx_set_8bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode)
 {
 	switch (pio_mode) {
 	case XFER_PIO_0:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_8);
 		break;
 	case XFER_PIO_1:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_8);
 		break;
 	case XFER_PIO_2:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_8);
 		break;
 	case XFER_PIO_3:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_8);
 		break;
 	case XFER_PIO_4:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_8);
 		break;
 	default:
 		break;
 	}
 	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 			   IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16|IXP4XX_EXP_BYTE_EN);
 }

 static void ixp4xx_set_16bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode)
 {
 	switch (pio_mode){
 	case XFER_PIO_0:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_16);
 		break;
 	case XFER_PIO_1:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_16);
 		break;
 	case XFER_PIO_2:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_16);
 		break;
 	case XFER_PIO_3:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_16);
 		break;
 	case XFER_PIO_4:
 		regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 				   IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_16);
 		break;
 	default:
 		break;
 	}
 	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
 			   IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16);
 }

 /* This sets up the timing on the chipselect CMD accordingly */
 static void ixp4xx_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	struct ixp4xx_pata *ixpp = ap->host->private_data;

 	ata_dev_info(adev, "configured for PIO%d 8bit\n",
 		       adev->pio_mode - XFER_PIO_0);
 	ixp4xx_set_8bit_timing(ixpp, adev->pio_mode);
 }


 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
 					  unsigned char *buf, unsigned int buflen, int rw)
 {
 	unsigned int i;
 	unsigned int words = buflen >> 1;
 	u16 *buf16 = (u16 *) buf;
 	struct ata_device *adev = qc->dev;
 	struct ata_port *ap = qc->dev->link->ap;
 	void __iomem *mmio = ap->ioaddr.data_addr;
 	struct ixp4xx_pata *ixpp = ap->host->private_data;
 	unsigned long flags;

 	ata_dev_dbg(adev, "%s %d bytes\n", (rw == READ) ? "READ" : "WRITE",
 		    buflen);
 	spin_lock_irqsave(ap->lock, flags);

 	/* set the expansion bus in 16bit mode and restore
 	 * 8 bit mode after the transaction.
 	 */
 	ixp4xx_set_16bit_timing(ixpp, adev->pio_mode);
 	udelay(5);

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

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

 		if (rw == READ) {
 			align_buf[0] = readw(mmio);
 			memcpy(trailing_buf, align_buf, 1);
 		} else {
 			memcpy(align_buf, trailing_buf, 1);
 			writew(align_buf[0], mmio);
 		}
 		words++;
 	}

 	ixp4xx_set_8bit_timing(ixpp, adev->pio_mode);
 	udelay(5);

 	spin_unlock_irqrestore(ap->lock, flags);

 	return words << 1;
 }

 static const struct scsi_host_template ixp4xx_sht = {
 	ATA_PIO_SHT(DRV_NAME),
 };

 static struct ata_port_operations ixp4xx_port_ops = {
 	.inherits		= &ata_sff_port_ops,
 	.sff_data_xfer		= ixp4xx_mmio_data_xfer,
 	.cable_detect		= ata_cable_40wire,
 	.set_piomode		= ixp4xx_set_piomode,
 };

 static struct ata_port_info ixp4xx_port_info = {
 	.flags		= ATA_FLAG_NO_ATAPI,
 	.pio_mask	= ATA_PIO4,
 	.port_ops	= &ixp4xx_port_ops,
 };

 static void ixp4xx_setup_port(struct ata_port *ap,
 			      struct ixp4xx_pata *ixpp,
 			      unsigned long raw_cmd, unsigned long raw_ctl)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;

 	raw_ctl += 0x06;
 	ioaddr->cmd_addr	= ixpp->cmd;
 	ioaddr->altstatus_addr	= ixpp->ctl + 0x06;
 	ioaddr->ctl_addr	= ixpp->ctl + 0x06;

 	ata_sff_std_ports(ioaddr);

 	if (!IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) {
 		/* 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;
 	}

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

 static int ixp4xx_pata_probe(struct platform_device *pdev)
 {
 	struct resource *cmd, *ctl;
 	struct ata_port_info pi = ixp4xx_port_info;
 	const struct ata_port_info *ppi[] = { &pi, NULL };
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct ixp4xx_pata *ixpp;
 	u32 csindex;
 	int ret;
 	int irq;

 	cmd = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	ctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);

 	if (!cmd || !ctl)
 		return -EINVAL;

 	ixpp = devm_kzalloc(dev, sizeof(*ixpp), GFP_KERNEL);
 	if (!ixpp)
 		return -ENOMEM;

 	ixpp->rmap = syscon_node_to_regmap(np->parent);
 	if (IS_ERR(ixpp->rmap))
 		return dev_err_probe(dev, PTR_ERR(ixpp->rmap), "no regmap\n");
 	/* Inspect our address to figure out what chipselect the CMD is on */
 	ret = of_property_read_u32_index(np, "reg", 0, &csindex);
 	if (ret)
 		return dev_err_probe(dev, ret, "can't inspect CMD address\n");
 	dev_info(dev, "using CS%d for PIO timing configuration\n", csindex);
 	ixpp->cmd_csreg = csindex * IXP4XX_EXP_TIMING_STRIDE;

 	ixpp->host = ata_host_alloc_pinfo(dev, ppi, 1);
 	if (!ixpp->host)
 		return -ENOMEM;
 	ixpp->host->private_data = ixpp;

 	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;

 	ixpp->cmd = devm_ioremap_resource(dev, cmd);
 	ixpp->ctl = devm_ioremap_resource(dev, ctl);
 	if (IS_ERR(ixpp->cmd) || IS_ERR(ixpp->ctl))
 		return -ENOMEM;

 	irq = platform_get_irq(pdev, 0);
 	if (irq > 0)
 		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 	else if (irq < 0)
 		return irq;
 	else
 		return -EINVAL;

 	/* Just one port to set up */
 	ixp4xx_setup_port(ixpp->host->ports[0], ixpp, cmd->start, ctl->start);

 	ata_print_version_once(dev, DRV_VERSION);

 	return ata_host_activate(ixpp->host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 }

 static const struct of_device_id ixp4xx_pata_of_match[] = {
 	{ .compatible = "intel,ixp4xx-compact-flash", },
 	{ /* sentinel */ }
 };

 static struct platform_driver ixp4xx_pata_platform_driver = {
 	.driver	 = {
 		.name   = DRV_NAME,
 		.of_match_table = ixp4xx_pata_of_match,
 	},
 	.probe		= ixp4xx_pata_probe,
 	.remove		= ata_platform_remove_one,
 };

 module_platform_driver(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_ALIAS("platform:" DRV_NAME);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* 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.
	*/

	#include <linux/kernel.h>
	#include <linux/mfd/syscon.h>
	#include <linux/module.h>
	#include <linux/libata.h>
	#include <linux/irq.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <scsi/scsi_host.h>

	#define DRV_NAME "pata_ixp4xx_cf"
	#define DRV_VERSION "1.0"

	struct ixp4xx_pata {
	struct ata_host *host;
	struct regmap *rmap;
	u32 cmd_csreg;
	void __iomem *cmd;
	void __iomem *ctl;
	};

	#define IXP4XX_EXP_TIMING_STRIDE 0x04
	/* The timings for the chipselect is in bits 29..16 */
	#define IXP4XX_EXP_T1_T5_MASK GENMASK(29, 16)
	#define IXP4XX_EXP_PIO_0_8 0x0a470000
	#define IXP4XX_EXP_PIO_1_8 0x06430000
	#define IXP4XX_EXP_PIO_2_8 0x02410000
	#define IXP4XX_EXP_PIO_3_8 0x00820000
	#define IXP4XX_EXP_PIO_4_8 0x00400000
	#define IXP4XX_EXP_PIO_0_16 0x29640000
	#define IXP4XX_EXP_PIO_1_16 0x05030000
	#define IXP4XX_EXP_PIO_2_16 0x00b20000
	#define IXP4XX_EXP_PIO_3_16 0x00820000
	#define IXP4XX_EXP_PIO_4_16 0x00400000
	#define IXP4XX_EXP_BW_MASK (BIT(6)\|BIT(0))
	#define IXP4XX_EXP_BYTE_RD16 BIT(6) /* Byte reads on half-word devices */
	#define IXP4XX_EXP_BYTE_EN BIT(0) /* Use 8bit data bus if set */

	static void ixp4xx_set_8bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode)
	{
	switch (pio_mode) {
	case XFER_PIO_0:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_8);
	break;
	case XFER_PIO_1:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_8);
	break;
	case XFER_PIO_2:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_8);
	break;
	case XFER_PIO_3:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_8);
	break;
	case XFER_PIO_4:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_8);
	break;
	default:
	break;
	}
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16\|IXP4XX_EXP_BYTE_EN);
	}

	static void ixp4xx_set_16bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode)
	{
	switch (pio_mode){
	case XFER_PIO_0:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_16);
	break;
	case XFER_PIO_1:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_16);
	break;
	case XFER_PIO_2:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_16);
	break;
	case XFER_PIO_3:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_16);
	break;
	case XFER_PIO_4:
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_16);
	break;
	default:
	break;
	}
	regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg,
	IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16);
	}

	/* This sets up the timing on the chipselect CMD accordingly */
	static void ixp4xx_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	struct ixp4xx_pata *ixpp = ap->host->private_data;

	ata_dev_info(adev, "configured for PIO%d 8bit\n",
	adev->pio_mode - XFER_PIO_0);
	ixp4xx_set_8bit_timing(ixpp, adev->pio_mode);
	}


	static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
	unsigned char *buf, unsigned int buflen, int rw)
	{
	unsigned int i;
	unsigned int words = buflen >> 1;
	u16 buf16 = (u16 ) buf;
	struct ata_device *adev = qc->dev;
	struct ata_port *ap = qc->dev->link->ap;
	void __iomem *mmio = ap->ioaddr.data_addr;
	struct ixp4xx_pata *ixpp = ap->host->private_data;
	unsigned long flags;

	ata_dev_dbg(adev, "%s %d bytes\n", (rw == READ) ? "READ" : "WRITE",
	buflen);
	spin_lock_irqsave(ap->lock, flags);

	/* set the expansion bus in 16bit mode and restore
	* 8 bit mode after the transaction.
	*/
	ixp4xx_set_16bit_timing(ixpp, adev->pio_mode);
	udelay(5);

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

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

	if (rw == READ) {
	align_buf[0] = readw(mmio);
	memcpy(trailing_buf, align_buf, 1);
	} else {
	memcpy(align_buf, trailing_buf, 1);
	writew(align_buf[0], mmio);
	}
	words++;
	}

	ixp4xx_set_8bit_timing(ixpp, adev->pio_mode);
	udelay(5);

	spin_unlock_irqrestore(ap->lock, flags);

	return words << 1;
	}

	static const struct scsi_host_template ixp4xx_sht = {
	ATA_PIO_SHT(DRV_NAME),
	};

	static struct ata_port_operations ixp4xx_port_ops = {
	.inherits = &ata_sff_port_ops,
	.sff_data_xfer = ixp4xx_mmio_data_xfer,
	.cable_detect = ata_cable_40wire,
	.set_piomode = ixp4xx_set_piomode,
	};

	static struct ata_port_info ixp4xx_port_info = {
	.flags = ATA_FLAG_NO_ATAPI,
	.pio_mask = ATA_PIO4,
	.port_ops = &ixp4xx_port_ops,
	};

	static void ixp4xx_setup_port(struct ata_port *ap,
	struct ixp4xx_pata *ixpp,
	unsigned long raw_cmd, unsigned long raw_ctl)
	{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	raw_ctl += 0x06;
	ioaddr->cmd_addr = ixpp->cmd;
	ioaddr->altstatus_addr = ixpp->ctl + 0x06;
	ioaddr->ctl_addr = ixpp->ctl + 0x06;

	ata_sff_std_ports(ioaddr);

	if (!IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) {
	/* 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;
	}

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

	static int ixp4xx_pata_probe(struct platform_device *pdev)
	{
	struct resource cmd, ctl;
	struct ata_port_info pi = ixp4xx_port_info;
	const struct ata_port_info *ppi[] = { &pi, NULL };
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct ixp4xx_pata *ixpp;
	u32 csindex;
	int ret;
	int irq;

	cmd = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!cmd \|\| !ctl)
	return -EINVAL;

	ixpp = devm_kzalloc(dev, sizeof(*ixpp), GFP_KERNEL);
	if (!ixpp)
	return -ENOMEM;

	ixpp->rmap = syscon_node_to_regmap(np->parent);
	if (IS_ERR(ixpp->rmap))
	return dev_err_probe(dev, PTR_ERR(ixpp->rmap), "no regmap\n");
	/* Inspect our address to figure out what chipselect the CMD is on */
	ret = of_property_read_u32_index(np, "reg", 0, &csindex);
	if (ret)
	return dev_err_probe(dev, ret, "can't inspect CMD address\n");
	dev_info(dev, "using CS%d for PIO timing configuration\n", csindex);
	ixpp->cmd_csreg = csindex * IXP4XX_EXP_TIMING_STRIDE;

	ixpp->host = ata_host_alloc_pinfo(dev, ppi, 1);
	if (!ixpp->host)
	return -ENOMEM;
	ixpp->host->private_data = ixpp;

	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
	if (ret)
	return ret;

	ixpp->cmd = devm_ioremap_resource(dev, cmd);
	ixpp->ctl = devm_ioremap_resource(dev, ctl);
	if (IS_ERR(ixpp->cmd) \|\| IS_ERR(ixpp->ctl))
	return -ENOMEM;

	irq = platform_get_irq(pdev, 0);
	if (irq > 0)
	irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
	else if (irq < 0)
	return irq;
	else
	return -EINVAL;

	/* Just one port to set up */
	ixp4xx_setup_port(ixpp->host->ports[0], ixpp, cmd->start, ctl->start);

	ata_print_version_once(dev, DRV_VERSION);

	return ata_host_activate(ixpp->host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
	}

	static const struct of_device_id ixp4xx_pata_of_match[] = {
	{ .compatible = "intel,ixp4xx-compact-flash", },
	{ /* sentinel */ }
	};

	static struct platform_driver ixp4xx_pata_platform_driver = {
	.driver = {
	.name = DRV_NAME,
	.of_match_table = ixp4xx_pata_of_match,
	},
	.probe = ixp4xx_pata_probe,
	.remove = ata_platform_remove_one,
	};

	module_platform_driver(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_ALIAS("platform:" DRV_NAME);