drivers/ide/tx4938ide.c - linux - Git at Google

 /*
  * TX4938 internal IDE driver
  * Based on tx4939ide.c.
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * (C) Copyright TOSHIBA CORPORATION 2005-2007
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/ide.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>

 #include <asm/ide.h>
 #include <asm/txx9/tx4938.h>

 static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
 				 unsigned int gbus_clock,
 				 u8 pio)
 {
 	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 	u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
 	unsigned int sp = (cr >> 4) & 3;
 	unsigned int clock = gbus_clock / (4 - sp);
 	unsigned int cycle = 1000000000 / clock;
 	unsigned int shwt;
 	int wt;

 	/* Minimum DIOx- active time */
 	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
 	/* IORDY setup time: 35ns */
 	wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
 	/* actual wait-cycle is max(wt & ~1, 1) */
 	if (wt > 2 && (wt & 1))
 		wt++;
 	wt &= ~1;
 	/* Address-valid to DIOR/DIOW setup */
 	shwt = DIV_ROUND_UP(t->setup, cycle);

 	/* -DIOx recovery time (SHWT * 4) and cycle time requirement */
 	while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
 		shwt++;
 	if (shwt > 7) {
 		pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
 		shwt = 7;
 	}
 	pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
 		 ebus_ch, cycle, wt, shwt);

 	__raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
 		     &tx4938_ebuscptr->cr[ebus_ch]);
 }

 static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
 	u8 safe = pio;
 	ide_drive_t *pair;

 	pair = ide_get_pair_dev(drive);
 	if (pair)
 		safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
 	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
 }

 #ifdef __BIG_ENDIAN

 /* custom iops (independent from SWAP_IO_SPACE) */
 static u8 tx4938ide_inb(unsigned long port)
 {
 	return __raw_readb((void __iomem *)port);
 }

 static void tx4938ide_outb(u8 value, unsigned long port)
 {
 	__raw_writeb(value, (void __iomem *)port);
 }

 static void tx4938ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct ide_io_ports *io_ports = &hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;
 	u8 HIHI = cmd->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;

 	if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
 		HIHI = 0xFF;

 	if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
 		u16 data = (tf->hob_data << 8) | tf->data;

 		/* no endian swap */
 		__raw_writew(data, (void __iomem *)io_ports->data_addr);
 	}

 	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 		tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 		tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 		tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 		tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 		tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);

 	if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
 		tx4938ide_outb(tf->feature, io_ports->feature_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
 		tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
 		tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
 		tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
 	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
 		tx4938ide_outb(tf->lbah, io_ports->lbah_addr);

 	if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
 		tx4938ide_outb((tf->device & HIHI) | drive->select,
 			       io_ports->device_addr);
 }

 static void tx4938ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct ide_io_ports *io_ports = &hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;

 	if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) {
 		u16 data;

 		/* no endian swap */
 		data = __raw_readw((void __iomem *)io_ports->data_addr);
 		tf->data = data & 0xff;
 		tf->hob_data = (data >> 8) & 0xff;
 	}

 	/* be sure we're looking at the low order bits */
 	tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);

 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = tx4938ide_inb(io_ports->feature_addr);
 	if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
 		tf->nsect  = tx4938ide_inb(io_ports->nsect_addr);
 	if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
 		tf->lbal   = tx4938ide_inb(io_ports->lbal_addr);
 	if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
 		tf->lbam   = tx4938ide_inb(io_ports->lbam_addr);
 	if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
 		tf->lbah   = tx4938ide_inb(io_ports->lbah_addr);
 	if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
 		tf->device = tx4938ide_inb(io_ports->device_addr);

 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 		tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);

 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature =
 				tx4938ide_inb(io_ports->feature_addr);
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 			tf->hob_nsect   = tx4938ide_inb(io_ports->nsect_addr);
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 			tf->hob_lbal    = tx4938ide_inb(io_ports->lbal_addr);
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 			tf->hob_lbam    = tx4938ide_inb(io_ports->lbam_addr);
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 			tf->hob_lbah    = tx4938ide_inb(io_ports->lbah_addr);
 	}
 }

 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,
 				void *buf, unsigned int len)
 {
 	unsigned long port = drive->hwif->io_ports.data_addr;
 	unsigned short *ptr = buf;
 	unsigned int count = (len + 1) / 2;

 	while (count--)
 		*ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 }

 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,
 				void *buf, unsigned int len)
 {
 	unsigned long port = drive->hwif->io_ports.data_addr;
 	unsigned short *ptr = buf;
 	unsigned int count = (len + 1) / 2;

 	while (count--) {
 		__raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 		ptr++;
 	}
 	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 }

 static const struct ide_tp_ops tx4938ide_tp_ops = {
 	.exec_command		= ide_exec_command,
 	.read_status		= ide_read_status,
 	.read_altstatus		= ide_read_altstatus,

 	.set_irq		= ide_set_irq,

 	.tf_load		= tx4938ide_tf_load,
 	.tf_read		= tx4938ide_tf_read,

 	.input_data		= tx4938ide_input_data_swap,
 	.output_data		= tx4938ide_output_data_swap,
 };

 #endif	/* __BIG_ENDIAN */

 static const struct ide_port_ops tx4938ide_port_ops = {
 	.set_pio_mode		= tx4938ide_set_pio_mode,
 };

 static const struct ide_port_info tx4938ide_port_info __initdata = {
 	.port_ops		= &tx4938ide_port_ops,
 #ifdef __BIG_ENDIAN
 	.tp_ops			= &tx4938ide_tp_ops,
 #endif
 	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 	.pio_mask		= ATA_PIO5,
 	.chipset		= ide_generic,
 };

 static int __init tx4938ide_probe(struct platform_device *pdev)
 {
 	hw_regs_t hw;
 	hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 	struct ide_host *host;
 	struct resource *res;
 	struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 	int irq, ret, i;
 	unsigned long mapbase, mapctl;
 	struct ide_port_info d = tx4938ide_port_info;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return -ENODEV;
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENODEV;

 	if (!devm_request_mem_region(&pdev->dev, res->start,
 				     res->end - res->start + 1, "tx4938ide"))
 		return -EBUSY;
 	mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 					      8 << pdata->ioport_shift);
 	mapctl = (unsigned long)devm_ioremap(&pdev->dev,
 					     res->start + 0x10000 +
 					     (6 << pdata->ioport_shift),
 					     1 << pdata->ioport_shift);
 	if (!mapbase || !mapctl)
 		return -EBUSY;

 	memset(&hw, 0, sizeof(hw));
 	if (pdata->ioport_shift) {
 		unsigned long port = mapbase;
 		unsigned long ctl = mapctl;

 		hw.io_ports_array[0] = port;
 #ifdef __BIG_ENDIAN
 		port++;
 		ctl++;
 #endif
 		for (i = 1; i <= 7; i++)
 			hw.io_ports_array[i] =
 				port + (i << pdata->ioport_shift);
 		hw.io_ports.ctl_addr = ctl;
 	} else
 		ide_std_init_ports(&hw, mapbase, mapctl);
 	hw.irq = irq;
 	hw.dev = &pdev->dev;

 	pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
 		mapbase, mapctl, hw.irq);
 	if (pdata->gbus_clock)
 		tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 	else
 		d.port_ops = NULL;
 	ret = ide_host_add(&d, hws, &host);
 	if (!ret)
 		platform_set_drvdata(pdev, host);
 	return ret;
 }

 static int __exit tx4938ide_remove(struct platform_device *pdev)
 {
 	struct ide_host *host = platform_get_drvdata(pdev);

 	ide_host_remove(host);
 	return 0;
 }

 static struct platform_driver tx4938ide_driver = {
 	.driver		= {
 		.name	= "tx4938ide",
 		.owner	= THIS_MODULE,
 	},
 	.remove = __exit_p(tx4938ide_remove),
 };

 static int __init tx4938ide_init(void)
 {
 	return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 }

 static void __exit tx4938ide_exit(void)
 {
 	platform_driver_unregister(&tx4938ide_driver);
 }

 module_init(tx4938ide_init);
 module_exit(tx4938ide_exit);

 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:tx4938ide");
	/*
	* TX4938 internal IDE driver
	* Based on tx4939ide.c.
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* (C) Copyright TOSHIBA CORPORATION 2005-2007
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/ide.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>

	#include <asm/ide.h>
	#include <asm/txx9/tx4938.h>

	static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
	unsigned int gbus_clock,
	u8 pio)
	{
	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
	u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
	unsigned int sp = (cr >> 4) & 3;
	unsigned int clock = gbus_clock / (4 - sp);
	unsigned int cycle = 1000000000 / clock;
	unsigned int shwt;
	int wt;

	/* Minimum DIOx- active time */
	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
	/* IORDY setup time: 35ns */
	wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
	/* actual wait-cycle is max(wt & ~1, 1) */
	if (wt > 2 && (wt & 1))
	wt++;
	wt &= ~1;
	/* Address-valid to DIOR/DIOW setup */
	shwt = DIV_ROUND_UP(t->setup, cycle);

	/* -DIOx recovery time (SHWT * 4) and cycle time requirement */
	while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
	shwt++;
	if (shwt > 7) {
	pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
	shwt = 7;
	}
	pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
	ebus_ch, cycle, wt, shwt);

	__raw_writeq((cr & ~0x3f007ull) \| (wt << 12) \| shwt,
	&tx4938_ebuscptr->cr[ebus_ch]);
	}

	static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
	u8 safe = pio;
	ide_drive_t *pair;

	pair = ide_get_pair_dev(drive);
	if (pair)
	safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
	}

	#ifdef __BIG_ENDIAN

	/* custom iops (independent from SWAP_IO_SPACE) */
	static u8 tx4938ide_inb(unsigned long port)
	{
	return __raw_readb((void __iomem *)port);
	}

	static void tx4938ide_outb(u8 value, unsigned long port)
	{
	__raw_writeb(value, (void __iomem *)port);
	}

	static void tx4938ide_tf_load(ide_drive_t drive, struct ide_cmd cmd)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &cmd->tf;
	u8 HIHI = cmd->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;

	if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
	HIHI = 0xFF;

	if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
	u16 data = (tf->hob_data << 8) \| tf->data;

	/* no endian swap */
	__raw_writew(data, (void __iomem *)io_ports->data_addr);
	}

	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
	tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
	tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
	tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
	tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
	tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);

	if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
	tx4938ide_outb(tf->feature, io_ports->feature_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
	tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
	tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
	tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
	tx4938ide_outb(tf->lbah, io_ports->lbah_addr);

	if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
	tx4938ide_outb((tf->device & HIHI) \| drive->select,
	io_ports->device_addr);
	}

	static void tx4938ide_tf_read(ide_drive_t drive, struct ide_cmd cmd)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &cmd->tf;

	if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) {
	u16 data;

	/* no endian swap */
	data = __raw_readw((void __iomem *)io_ports->data_addr);
	tf->data = data & 0xff;
	tf->hob_data = (data >> 8) & 0xff;
	}

	/* be sure we're looking at the low order bits */
	tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);

	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
	tf->feature = tx4938ide_inb(io_ports->feature_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
	tf->nsect = tx4938ide_inb(io_ports->nsect_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
	tf->lbal = tx4938ide_inb(io_ports->lbal_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
	tf->lbam = tx4938ide_inb(io_ports->lbam_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
	tf->lbah = tx4938ide_inb(io_ports->lbah_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
	tf->device = tx4938ide_inb(io_ports->device_addr);

	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
	tx4938ide_outb(ATA_DEVCTL_OBS \| 0x80, io_ports->ctl_addr);

	if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
	tf->hob_feature =
	tx4938ide_inb(io_ports->feature_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
	tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
	tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
	tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr);
	if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
	tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr);
	}
	}

	static void tx4938ide_input_data_swap(ide_drive_t drive, struct request rq,
	void *buf, unsigned int len)
	{
	unsigned long port = drive->hwif->io_ports.data_addr;
	unsigned short *ptr = buf;
	unsigned int count = (len + 1) / 2;

	while (count--)
	ptr++ = cpu_to_le16(__raw_readw((void __iomem )port));
	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
	}

	static void tx4938ide_output_data_swap(ide_drive_t drive, struct request rq,
	void *buf, unsigned int len)
	{
	unsigned long port = drive->hwif->io_ports.data_addr;
	unsigned short *ptr = buf;
	unsigned int count = (len + 1) / 2;

	while (count--) {
	__raw_writew(le16_to_cpu(ptr), (void __iomem )port);
	ptr++;
	}
	__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
	}

	static const struct ide_tp_ops tx4938ide_tp_ops = {
	.exec_command = ide_exec_command,
	.read_status = ide_read_status,
	.read_altstatus = ide_read_altstatus,

	.set_irq = ide_set_irq,

	.tf_load = tx4938ide_tf_load,
	.tf_read = tx4938ide_tf_read,

	.input_data = tx4938ide_input_data_swap,
	.output_data = tx4938ide_output_data_swap,
	};

	#endif /* __BIG_ENDIAN */

	static const struct ide_port_ops tx4938ide_port_ops = {
	.set_pio_mode = tx4938ide_set_pio_mode,
	};

	static const struct ide_port_info tx4938ide_port_info __initdata = {
	.port_ops = &tx4938ide_port_ops,
	#ifdef __BIG_ENDIAN
	.tp_ops = &tx4938ide_tp_ops,
	#endif
	.host_flags = IDE_HFLAG_MMIO \| IDE_HFLAG_NO_DMA,
	.pio_mask = ATA_PIO5,
	.chipset = ide_generic,
	};

	static int __init tx4938ide_probe(struct platform_device *pdev)
	{
	hw_regs_t hw;
	hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
	struct ide_host *host;
	struct resource *res;
	struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
	int irq, ret, i;
	unsigned long mapbase, mapctl;
	struct ide_port_info d = tx4938ide_port_info;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return -ENODEV;
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
	return -ENODEV;

	if (!devm_request_mem_region(&pdev->dev, res->start,
	res->end - res->start + 1, "tx4938ide"))
	return -EBUSY;
	mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
	8 << pdata->ioport_shift);
	mapctl = (unsigned long)devm_ioremap(&pdev->dev,
	res->start + 0x10000 +
	(6 << pdata->ioport_shift),
	1 << pdata->ioport_shift);
	if (!mapbase \|\| !mapctl)
	return -EBUSY;

	memset(&hw, 0, sizeof(hw));
	if (pdata->ioport_shift) {
	unsigned long port = mapbase;
	unsigned long ctl = mapctl;

	hw.io_ports_array[0] = port;
	#ifdef __BIG_ENDIAN
	port++;
	ctl++;
	#endif
	for (i = 1; i <= 7; i++)
	hw.io_ports_array[i] =
	port + (i << pdata->ioport_shift);
	hw.io_ports.ctl_addr = ctl;
	} else
	ide_std_init_ports(&hw, mapbase, mapctl);
	hw.irq = irq;
	hw.dev = &pdev->dev;

	pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
	mapbase, mapctl, hw.irq);
	if (pdata->gbus_clock)
	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
	else
	d.port_ops = NULL;
	ret = ide_host_add(&d, hws, &host);
	if (!ret)
	platform_set_drvdata(pdev, host);
	return ret;
	}

	static int __exit tx4938ide_remove(struct platform_device *pdev)
	{
	struct ide_host *host = platform_get_drvdata(pdev);

	ide_host_remove(host);
	return 0;
	}

	static struct platform_driver tx4938ide_driver = {
	.driver = {
	.name = "tx4938ide",
	.owner = THIS_MODULE,
	},
	.remove = __exit_p(tx4938ide_remove),
	};

	static int __init tx4938ide_init(void)
	{
	return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
	}

	static void __exit tx4938ide_exit(void)
	{
	platform_driver_unregister(&tx4938ide_driver);
	}

	module_init(tx4938ide_init);
	module_exit(tx4938ide_exit);

	MODULE_DESCRIPTION("TX4938 internal IDE driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:tx4938ide");