[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ide / tx4938ide.c

/*
 * 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/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 wt, shwt;

	/* Minimum DIOx- active time */
	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
	/* IORDY setup time: 35ns */
	wt = max(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);

	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, ide_task_t *task)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &task->tf;
	u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;

	if (task->tf_flags & IDE_TFLAG_FLAGGED)
		HIHI = 0xFF;

	if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
		u16 data = (tf->hob_data << 8) | tf->data;

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

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

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

	if (task->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, ide_task_t *task)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &task->tf;

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

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

		if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
			tf->hob_feature =
				tx4938ide_inb(io_ports->feature_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
			tf->hob_nsect   = tx4938ide_inb(io_ports->nsect_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
			tf->hob_lbal    = tx4938ide_inb(io_ports->lbal_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
			tf->hob_lbam    = tx4938ide_inb(io_ports->lbam_addr);
		if (task->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, count * 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, count * 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,
	.read_sff_dma_status	= ide_read_sff_dma_status,

	.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,
};

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;
	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,
					      res->end - res->start + 1);
	if (!mapbase)
		return -EBUSY;

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

		hw.io_ports_array[0] = port;
#ifdef __BIG_ENDIAN
		port++;
#endif
		for (i = 1; i <= 7; i++)
			hw.io_ports_array[i] =
				port + (i << pdata->ioport_shift);
		hw.io_ports.ctl_addr =
			port + 0x10000 + (6 << pdata->ioport_shift);
	} else
		ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);
	hw.irq = irq;
	hw.dev = &pdev->dev;

	pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, 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)
		return ret;
	platform_set_drvdata(pdev, host);
	return 0;
}

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");
Commit	Line	Data
28502848 AN	1	/*
	2	* TX4938 internal IDE driver
	3	* Based on tx4939ide.c.
	4	*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*
	9	* (C) Copyright TOSHIBA CORPORATION 2005-2007
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/types.h>
	14	#include <linux/ide.h>
	15	#include <linux/init.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/io.h>
	18	#include <asm/txx9/tx4938.h>
	19
	20	static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
	21	unsigned int gbus_clock,
	22	u8 pio)
	23	{
	24	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
	25	u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
	26	unsigned int sp = (cr >> 4) & 3;
	27	unsigned int clock = gbus_clock / (4 - sp);
	28	unsigned int cycle = 1000000000 / clock;
	29	unsigned int wt, shwt;
	30
	31	/* Minimum DIOx- active time */
	32	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
	33	/* IORDY setup time: 35ns */
	34	wt = max(wt, DIV_ROUND_UP(35, cycle));
	35	/* actual wait-cycle is max(wt & ~1, 1) */
	36	if (wt > 2 && (wt & 1))
	37	wt++;
	38	wt &= ~1;
	39	/* Address-valid to DIOR/DIOW setup */
	40	shwt = DIV_ROUND_UP(t->setup, cycle);
	41
	42	pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
	43	ebus_ch, cycle, wt, shwt);
	44
	45	__raw_writeq((cr & ~(0x3f007ull)) \| (wt << 12) \| shwt,
	46	&tx4938_ebuscptr->cr[ebus_ch]);
	47	}
	48
	49	static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
	50	{
	51	ide_hwif_t *hwif = drive->hwif;
	52	struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
	53	u8 safe = pio;
	54	ide_drive_t *pair;
	55
	56	pair = ide_get_pair_dev(drive);
	57	if (pair)
	58	safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
	59	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
	60	}
	61
	62	#ifdef __BIG_ENDIAN
	63
	64	/* custom iops (independent from SWAP_IO_SPACE) */
65	static u8 tx4938ide_inb(unsigned long port)
66	{
67	return __raw_readb((void __iomem *)port);
68	}
69
70	static void tx4938ide_outb(u8 value, unsigned long port)
71	{
72	__raw_writeb(value, (void __iomem *)port);
73	}
74
75	static void tx4938ide_tf_load(ide_drive_t drive, ide_task_t task)
76	{
77	ide_hwif_t *hwif = drive->hwif;
78	struct ide_io_ports *io_ports = &hwif->io_ports;
79	struct ide_taskfile *tf = &task->tf;
80	u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
81
82	if (task->tf_flags & IDE_TFLAG_FLAGGED)
83	HIHI = 0xFF;
84
85	if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
86	u16 data = (tf->hob_data << 8) \| tf->data;
87
88	/* no endian swap */
89	__raw_writew(data, (void __iomem *)io_ports->data_addr);
90	}
91
92	if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
93	tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
94	if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
95	tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
96	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
97	tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
98	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
99	tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
100	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
101	tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
102
103	if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
104	tx4938ide_outb(tf->feature, io_ports->feature_addr);
105	if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
106	tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
107	if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
108	tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
109	if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
110	tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
111	if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
112	tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
113
114	if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
115	tx4938ide_outb((tf->device & HIHI) \| drive->select,
116	io_ports->device_addr);
117	}
118
119	static void tx4938ide_tf_read(ide_drive_t drive, ide_task_t task)
120	{
121	ide_hwif_t *hwif = drive->hwif;
122	struct ide_io_ports *io_ports = &hwif->io_ports;
123	struct ide_taskfile *tf = &task->tf;
124
125	if (task->tf_flags & IDE_TFLAG_IN_DATA) {
126	u16 data;
127
128	/* no endian swap */
129	data = __raw_readw((void __iomem *)io_ports->data_addr);
130	tf->data = data & 0xff;
131	tf->hob_data = (data >> 8) & 0xff;
132	}
133
134	/* be sure we're looking at the low order bits */
135	tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
136
137	if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
138	tf->feature = tx4938ide_inb(io_ports->feature_addr);
139	if (task->tf_flags & IDE_TFLAG_IN_NSECT)
140	tf->nsect = tx4938ide_inb(io_ports->nsect_addr);
141	if (task->tf_flags & IDE_TFLAG_IN_LBAL)
142	tf->lbal = tx4938ide_inb(io_ports->lbal_addr);
143	if (task->tf_flags & IDE_TFLAG_IN_LBAM)
144	tf->lbam = tx4938ide_inb(io_ports->lbam_addr);
145	if (task->tf_flags & IDE_TFLAG_IN_LBAH)
146	tf->lbah = tx4938ide_inb(io_ports->lbah_addr);
147	if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
148	tf->device = tx4938ide_inb(io_ports->device_addr);
149
150	if (task->tf_flags & IDE_TFLAG_LBA48) {
151	tx4938ide_outb(ATA_DEVCTL_OBS \| 0x80, io_ports->ctl_addr);
152
153	if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
154	tf->hob_feature =
155	tx4938ide_inb(io_ports->feature_addr);
156	if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
157	tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr);
158	if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
159	tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr);
160	if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
161	tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr);
162	if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
163	tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr);
164	}
165	}
166
167	static void tx4938ide_input_data_swap(ide_drive_t drive, struct request rq,
168	void *buf, unsigned int len)
169	{
170	unsigned long port = drive->hwif->io_ports.data_addr;
171	unsigned short *ptr = buf;
172	unsigned int count = (len + 1) / 2;
173
174	while (count--)
175	ptr++ = cpu_to_le16(__raw_readw((void __iomem )port));
176	__ide_flush_dcache_range((unsigned long)buf, count * 2);
177	}
178
179	static void tx4938ide_output_data_swap(ide_drive_t drive, struct request rq,
180	void *buf, unsigned int len)
181	{
182	unsigned long port = drive->hwif->io_ports.data_addr;
183	unsigned short *ptr = buf;
184	unsigned int count = (len + 1) / 2;
185
186	while (count--) {
187	__raw_writew(le16_to_cpu(ptr), (void __iomem )port);
188	ptr++;
189	}
190	__ide_flush_dcache_range((unsigned long)buf, count * 2);
191	}
192
193	static const struct ide_tp_ops tx4938ide_tp_ops = {
194	.exec_command = ide_exec_command,
195	.read_status = ide_read_status,
196	.read_altstatus = ide_read_altstatus,
197	.read_sff_dma_status = ide_read_sff_dma_status,
198
199	.set_irq = ide_set_irq,
200
201	.tf_load = tx4938ide_tf_load,
202	.tf_read = tx4938ide_tf_read,
203
204	.input_data = tx4938ide_input_data_swap,
205	.output_data = tx4938ide_output_data_swap,
206	};
207
208	#endif /* __BIG_ENDIAN */
209
210	static const struct ide_port_ops tx4938ide_port_ops = {
211	.set_pio_mode = tx4938ide_set_pio_mode,
212	};
213
214	static const struct ide_port_info tx4938ide_port_info __initdata = {
215	.port_ops = &tx4938ide_port_ops,
216	#ifdef __BIG_ENDIAN
217	.tp_ops = &tx4938ide_tp_ops,
218	#endif
219	.host_flags = IDE_HFLAG_MMIO \| IDE_HFLAG_NO_DMA,
220	.pio_mask = ATA_PIO5,
221	};
222
223	static int __init tx4938ide_probe(struct platform_device *pdev)
224	{
225	hw_regs_t hw;
226	hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
227	struct ide_host *host;
228	struct resource *res;
229	struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
230	int irq, ret, i;
231	unsigned long mapbase;
232	struct ide_port_info d = tx4938ide_port_info;
233
234	irq = platform_get_irq(pdev, 0);
235	if (irq < 0)
236	return -ENODEV;
237	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
238	if (!res)
239	return -ENODEV;
240
241	if (!devm_request_mem_region(&pdev->dev, res->start,
242	res->end - res->start + 1, "tx4938ide"))
243	return -EBUSY;
244	mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
245	res->end - res->start + 1);
246	if (!mapbase)
247	return -EBUSY;
248
249	memset(&hw, 0, sizeof(hw));
250	if (pdata->ioport_shift) {
251	unsigned long port = mapbase;
252
253	hw.io_ports_array[0] = port;
254	#ifdef __BIG_ENDIAN
255	port++;
256	#endif
257	for (i = 1; i <= 7; i++)
258	hw.io_ports_array[i] =
259	port + (i << pdata->ioport_shift);
260	hw.io_ports.ctl_addr =
261	port + 0x10000 + (6 << pdata->ioport_shift);
262	} else
263	ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);
264	hw.irq = irq;
265	hw.dev = &pdev->dev;
266
267	pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, hw.irq);
268	if (pdata->gbus_clock)
269	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
270	else
271	d.port_ops = NULL;
272	ret = ide_host_add(&d, hws, &host);
273	if (ret)
274	return ret;
275	platform_set_drvdata(pdev, host);
276	return 0;
277	}
278
279	static int __exit tx4938ide_remove(struct platform_device *pdev)
280	{
281	struct ide_host *host = platform_get_drvdata(pdev);
282
283	ide_host_remove(host);
284	return 0;
285	}
286
287	static struct platform_driver tx4938ide_driver = {
288	.driver = {
289	.name = "tx4938ide",
290	.owner = THIS_MODULE,
291	},
292	.remove = __exit_p(tx4938ide_remove),
293	};
294
295	static int __init tx4938ide_init(void)
296	{
297	return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
298	}
299
300	static void __exit tx4938ide_exit(void)
301	{
302	platform_driver_unregister(&tx4938ide_driver);
303	}
304
305	module_init(tx4938ide_init);
306	module_exit(tx4938ide_exit);
307
308	MODULE_DESCRIPTION("TX4938 internal IDE driver");
309	MODULE_LICENSE("GPL");
310	MODULE_ALIAS("platform:tx4938ide");