[net-next-2.6.git] / drivers / ata / pata_pxa.c

/*
 * Generic PXA PATA driver
 *
 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/completion.h>

#include <scsi/scsi_host.h>

#include <mach/pxa2xx-regs.h>
#include <mach/pata_pxa.h>
#include <mach/dma.h>

#define DRV_NAME	"pata_pxa"
#define DRV_VERSION	"0.1"

struct pata_pxa_data {
	uint32_t		dma_channel;
	struct pxa_dma_desc	*dma_desc;
	dma_addr_t		dma_desc_addr;
	uint32_t		dma_desc_id;

	/* DMA IO physical address */
	uint32_t		dma_io_addr;
	/* PXA DREQ<0:2> pin selector */
	uint32_t		dma_dreq;
	/* DMA DCSR register value */
	uint32_t		dma_dcsr;

	struct completion	dma_done;
};

/*
 * Setup the DMA descriptors. The size is transfer capped at 4k per descriptor,
 * if the transfer is longer, it is split into multiple chained descriptors.
 */
static void pxa_load_dmac(struct scatterlist *sg, struct ata_queued_cmd *qc)
{
	struct pata_pxa_data *pd = qc->ap->private_data;

	uint32_t cpu_len, seg_len;
	dma_addr_t cpu_addr;

	cpu_addr = sg_dma_address(sg);
	cpu_len = sg_dma_len(sg);

	do {
		seg_len = (cpu_len > 0x1000) ? 0x1000 : cpu_len;

		pd->dma_desc[pd->dma_desc_id].ddadr = pd->dma_desc_addr +
			((pd->dma_desc_id + 1) * sizeof(struct pxa_dma_desc));

		pd->dma_desc[pd->dma_desc_id].dcmd = DCMD_BURST32 |
					DCMD_WIDTH2 | (DCMD_LENGTH & seg_len);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			pd->dma_desc[pd->dma_desc_id].dsadr = cpu_addr;
			pd->dma_desc[pd->dma_desc_id].dtadr = pd->dma_io_addr;
			pd->dma_desc[pd->dma_desc_id].dcmd |= DCMD_INCSRCADDR |
						DCMD_FLOWTRG;
		} else {
			pd->dma_desc[pd->dma_desc_id].dsadr = pd->dma_io_addr;
			pd->dma_desc[pd->dma_desc_id].dtadr = cpu_addr;
			pd->dma_desc[pd->dma_desc_id].dcmd |= DCMD_INCTRGADDR |
						DCMD_FLOWSRC;
		}

		cpu_len -= seg_len;
		cpu_addr += seg_len;
		pd->dma_desc_id++;

	} while (cpu_len);

	/* Should not happen */
	if (seg_len & 0x1f)
		DALGN |= (1 << pd->dma_dreq);
}

/*
 * Prepare taskfile for submission.
 */
static void pxa_qc_prep(struct ata_queued_cmd *qc)
{
	struct pata_pxa_data *pd = qc->ap->private_data;
	int si = 0;
	struct scatterlist *sg;

	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	pd->dma_desc_id = 0;

	DCSR(pd->dma_channel) = 0;
	DALGN &= ~(1 << pd->dma_dreq);

	for_each_sg(qc->sg, sg, qc->n_elem, si)
		pxa_load_dmac(sg, qc);

	pd->dma_desc[pd->dma_desc_id - 1].ddadr = DDADR_STOP;

	/* Fire IRQ only at the end of last block */
	pd->dma_desc[pd->dma_desc_id - 1].dcmd |= DCMD_ENDIRQEN;

	DDADR(pd->dma_channel) = pd->dma_desc_addr;
	DRCMR(pd->dma_dreq) = DRCMR_MAPVLD | pd->dma_channel;

}

/*
 * Configure the DMA controller, load the DMA descriptors, but don't start the
 * DMA controller yet. Only issue the ATA command.
 */
static void pxa_bmdma_setup(struct ata_queued_cmd *qc)
{
	qc->ap->ops->sff_exec_command(qc->ap, &qc->tf);
}

/*
 * Execute the DMA transfer.
 */
static void pxa_bmdma_start(struct ata_queued_cmd *qc)
{
	struct pata_pxa_data *pd = qc->ap->private_data;
	init_completion(&pd->dma_done);
	DCSR(pd->dma_channel) = DCSR_RUN;
}

/*
 * Wait until the DMA transfer completes, then stop the DMA controller.
 */
static void pxa_bmdma_stop(struct ata_queued_cmd *qc)
{
	struct pata_pxa_data *pd = qc->ap->private_data;

	if ((DCSR(pd->dma_channel) & DCSR_RUN) &&
		wait_for_completion_timeout(&pd->dma_done, HZ))
		dev_err(qc->ap->dev, "Timeout waiting for DMA completion!");

	DCSR(pd->dma_channel) = 0;
}

/*
 * Read DMA status. The bmdma_stop() will take care of properly finishing the
 * DMA transfer so we always have DMA-complete interrupt here.
 */
static unsigned char pxa_bmdma_status(struct ata_port *ap)
{
	struct pata_pxa_data *pd = ap->private_data;
	unsigned char ret = ATA_DMA_INTR;

	if (pd->dma_dcsr & DCSR_BUSERR)
		ret |= ATA_DMA_ERR;

	return ret;
}

/*
 * No IRQ register present so we do nothing.
 */
static void pxa_irq_clear(struct ata_port *ap)
{
}

/*
 * Check for ATAPI DMA. ATAPI DMA is unsupported by this driver. It's still
 * unclear why ATAPI has DMA issues.
 */
static int pxa_check_atapi_dma(struct ata_queued_cmd *qc)
{
	return -EOPNOTSUPP;
}

static struct scsi_host_template pxa_ata_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations pxa_ata_port_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.cable_detect		= ata_cable_40wire,

	.bmdma_setup		= pxa_bmdma_setup,
	.bmdma_start		= pxa_bmdma_start,
	.bmdma_stop		= pxa_bmdma_stop,
	.bmdma_status		= pxa_bmdma_status,

	.check_atapi_dma	= pxa_check_atapi_dma,

	.sff_irq_clear		= pxa_irq_clear,

	.qc_prep		= pxa_qc_prep,
};

/*
 * DMA interrupt handler.
 */
static void pxa_ata_dma_irq(int dma, void *port)
{
	struct ata_port *ap = port;
	struct pata_pxa_data *pd = ap->private_data;

	pd->dma_dcsr = DCSR(dma);
	DCSR(dma) = pd->dma_dcsr;

	if (pd->dma_dcsr & DCSR_STOPSTATE)
		complete(&pd->dma_done);
}

static int __devinit pxa_ata_probe(struct platform_device *pdev)
{
	struct ata_host *host;
	struct ata_port *ap;
	struct pata_pxa_data *data;
	struct resource *cmd_res;
	struct resource *ctl_res;
	struct resource *dma_res;
	struct resource *irq_res;
	struct pata_pxa_pdata *pdata = pdev->dev.platform_data;
	int ret = 0;

	/*
	 * Resource validation, three resources are needed:
	 *  - CMD port base address
	 *  - CTL port base address
	 *  - DMA port base address
	 *  - IRQ pin
	 */
	if (pdev->num_resources != 4) {
		dev_err(&pdev->dev, "invalid number of resources\n");
		return -EINVAL;
	}

	/*
	 * CMD port base address
	 */
	cmd_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (unlikely(cmd_res == NULL))
		return -EINVAL;

	/*
	 * CTL port base address
	 */
	ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (unlikely(ctl_res == NULL))
		return -EINVAL;

	/*
	 * DMA port base address
	 */
	dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (unlikely(dma_res == NULL))
		return -EINVAL;

	/*
	 * IRQ pin
	 */
	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (unlikely(irq_res == NULL))
		return -EINVAL;

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

	ap		= host->ports[0];
	ap->ops		= &pxa_ata_port_ops;
	ap->pio_mask	= ATA_PIO4;
	ap->mwdma_mask	= ATA_MWDMA2;
	ap->flags	= ATA_FLAG_MMIO;

	ap->ioaddr.cmd_addr	= devm_ioremap(&pdev->dev, cmd_res->start,
						resource_size(cmd_res));
	ap->ioaddr.ctl_addr	= devm_ioremap(&pdev->dev, ctl_res->start,
						resource_size(ctl_res));
	ap->ioaddr.bmdma_addr	= devm_ioremap(&pdev->dev, dma_res->start,
						resource_size(dma_res));

	/*
	 * Adjust register offsets
	 */
	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
	ap->ioaddr.data_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_DATA << pdata->reg_shift);
	ap->ioaddr.error_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_ERR << pdata->reg_shift);
	ap->ioaddr.feature_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_FEATURE << pdata->reg_shift);
	ap->ioaddr.nsect_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_NSECT << pdata->reg_shift);
	ap->ioaddr.lbal_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_LBAL << pdata->reg_shift);
	ap->ioaddr.lbam_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_LBAM << pdata->reg_shift);
	ap->ioaddr.lbah_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_LBAH << pdata->reg_shift);
	ap->ioaddr.device_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_DEVICE << pdata->reg_shift);
	ap->ioaddr.status_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_STATUS << pdata->reg_shift);
	ap->ioaddr.command_addr	= ap->ioaddr.cmd_addr +
					(ATA_REG_CMD << pdata->reg_shift);

	/*
	 * Allocate and load driver's internal data structure
	 */
	data = devm_kzalloc(&pdev->dev, sizeof(struct pata_pxa_data),
								GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ap->private_data = data;
	data->dma_dreq = pdata->dma_dreq;
	data->dma_io_addr = dma_res->start;

	/*
	 * Allocate space for the DMA descriptors
	 */
	data->dma_desc = dmam_alloc_coherent(&pdev->dev, PAGE_SIZE,
					&data->dma_desc_addr, GFP_KERNEL);
	if (!data->dma_desc)
		return -EINVAL;

	/*
	 * Request the DMA channel
	 */
	data->dma_channel = pxa_request_dma(DRV_NAME, DMA_PRIO_LOW,
						pxa_ata_dma_irq, ap);
	if (data->dma_channel < 0)
		return -EBUSY;

	/*
	 * Stop and clear the DMA channel
	 */
	DCSR(data->dma_channel) = 0;

	/*
	 * Activate the ATA host
	 */
	ret = ata_host_activate(host, irq_res->start, ata_sff_interrupt,
				pdata->irq_flags, &pxa_ata_sht);
	if (ret)
		pxa_free_dma(data->dma_channel);

	return ret;
}

static int __devexit pxa_ata_remove(struct platform_device *pdev)
{
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	struct pata_pxa_data *data = host->ports[0]->private_data;

	pxa_free_dma(data->dma_channel);

	ata_host_detach(host);

	return 0;
}

static struct platform_driver pxa_ata_driver = {
	.probe		= pxa_ata_probe,
	.remove		= __devexit_p(pxa_ata_remove),
	.driver		= {
		.name		= DRV_NAME,
		.owner		= THIS_MODULE,
	},
};

static int __init pxa_ata_init(void)
{
	return platform_driver_register(&pxa_ata_driver);
}

static void __exit pxa_ata_exit(void)
{
	platform_driver_unregister(&pxa_ata_driver);
}

module_init(pxa_ata_init);
module_exit(pxa_ata_exit);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("DMA-capable driver for PATA on PXA CPU");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);
Commit	Line	Data
2dc6c6f1 MV	1	/*
	2	* Generic PXA PATA driver
	3	*
	4	* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2, or (at your option)
	9	* any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; see the file COPYING. If not, write to
	18	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/blkdev.h>
	25	#include <linux/ata.h>
	26	#include <linux/libata.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/gpio.h>
	29	#include <linux/slab.h>
	30	#include <linux/completion.h>
	31
	32	#include <scsi/scsi_host.h>
	33
	34	#include <mach/pxa2xx-regs.h>
	35	#include <mach/pata_pxa.h>
	36	#include <mach/dma.h>
	37
	38	#define DRV_NAME "pata_pxa"
	39	#define DRV_VERSION "0.1"
	40
	41	struct pata_pxa_data {
	42	uint32_t dma_channel;
	43	struct pxa_dma_desc *dma_desc;
	44	dma_addr_t dma_desc_addr;
	45	uint32_t dma_desc_id;
	46
	47	/* DMA IO physical address */
	48	uint32_t dma_io_addr;
	49	/* PXA DREQ<0:2> pin selector */
	50	uint32_t dma_dreq;
	51	/* DMA DCSR register value */
	52	uint32_t dma_dcsr;
	53
	54	struct completion dma_done;
	55	};
	56
	57	/*
	58	* Setup the DMA descriptors. The size is transfer capped at 4k per descriptor,
	59	* if the transfer is longer, it is split into multiple chained descriptors.
	60	*/
	61	static void pxa_load_dmac(struct scatterlist sg, struct ata_queued_cmd qc)
	62	{
	63	struct pata_pxa_data *pd = qc->ap->private_data;
	64
65	uint32_t cpu_len, seg_len;
66	dma_addr_t cpu_addr;
67
68	cpu_addr = sg_dma_address(sg);
69	cpu_len = sg_dma_len(sg);
70
71	do {
72	seg_len = (cpu_len > 0x1000) ? 0x1000 : cpu_len;
73
74	pd->dma_desc[pd->dma_desc_id].ddadr = pd->dma_desc_addr +
75	((pd->dma_desc_id + 1) * sizeof(struct pxa_dma_desc));
76
77	pd->dma_desc[pd->dma_desc_id].dcmd = DCMD_BURST32 \|
78	DCMD_WIDTH2 \| (DCMD_LENGTH & seg_len);
79
80	if (qc->tf.flags & ATA_TFLAG_WRITE) {
81	pd->dma_desc[pd->dma_desc_id].dsadr = cpu_addr;
82	pd->dma_desc[pd->dma_desc_id].dtadr = pd->dma_io_addr;
83	pd->dma_desc[pd->dma_desc_id].dcmd \|= DCMD_INCSRCADDR \|
84	DCMD_FLOWTRG;
85	} else {
86	pd->dma_desc[pd->dma_desc_id].dsadr = pd->dma_io_addr;
87	pd->dma_desc[pd->dma_desc_id].dtadr = cpu_addr;
88	pd->dma_desc[pd->dma_desc_id].dcmd \|= DCMD_INCTRGADDR \|
89	DCMD_FLOWSRC;
90	}
91
92	cpu_len -= seg_len;
93	cpu_addr += seg_len;
94	pd->dma_desc_id++;
95
96	} while (cpu_len);
97
98	/* Should not happen */
99	if (seg_len & 0x1f)
100	DALGN \|= (1 << pd->dma_dreq);
101	}
102
103	/*
104	* Prepare taskfile for submission.
105	*/
106	static void pxa_qc_prep(struct ata_queued_cmd *qc)
107	{
108	struct pata_pxa_data *pd = qc->ap->private_data;
109	int si = 0;
110	struct scatterlist *sg;
111
112	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
113	return;
114
115	pd->dma_desc_id = 0;
116
117	DCSR(pd->dma_channel) = 0;
118	DALGN &= ~(1 << pd->dma_dreq);
119
120	for_each_sg(qc->sg, sg, qc->n_elem, si)
121	pxa_load_dmac(sg, qc);
122
123	pd->dma_desc[pd->dma_desc_id - 1].ddadr = DDADR_STOP;
124
125	/* Fire IRQ only at the end of last block */
126	pd->dma_desc[pd->dma_desc_id - 1].dcmd \|= DCMD_ENDIRQEN;
127
128	DDADR(pd->dma_channel) = pd->dma_desc_addr;
129	DRCMR(pd->dma_dreq) = DRCMR_MAPVLD \| pd->dma_channel;
130
131	}
132
133	/*
134	* Configure the DMA controller, load the DMA descriptors, but don't start the
135	* DMA controller yet. Only issue the ATA command.
136	*/
137	static void pxa_bmdma_setup(struct ata_queued_cmd *qc)
138	{
139	qc->ap->ops->sff_exec_command(qc->ap, &qc->tf);
140	}
141
142	/*
143	* Execute the DMA transfer.
144	*/
145	static void pxa_bmdma_start(struct ata_queued_cmd *qc)
146	{
147	struct pata_pxa_data *pd = qc->ap->private_data;
148	init_completion(&pd->dma_done);
149	DCSR(pd->dma_channel) = DCSR_RUN;
150	}
151
152	/*
153	* Wait until the DMA transfer completes, then stop the DMA controller.
154	*/
155	static void pxa_bmdma_stop(struct ata_queued_cmd *qc)
156	{
157	struct pata_pxa_data *pd = qc->ap->private_data;
158
159	if ((DCSR(pd->dma_channel) & DCSR_RUN) &&
160	wait_for_completion_timeout(&pd->dma_done, HZ))
161	dev_err(qc->ap->dev, "Timeout waiting for DMA completion!");
162
163	DCSR(pd->dma_channel) = 0;
164	}
165
166	/*
167	* Read DMA status. The bmdma_stop() will take care of properly finishing the
168	* DMA transfer so we always have DMA-complete interrupt here.
169	*/
170	static unsigned char pxa_bmdma_status(struct ata_port *ap)
171	{
172	struct pata_pxa_data *pd = ap->private_data;
173	unsigned char ret = ATA_DMA_INTR;
174
175	if (pd->dma_dcsr & DCSR_BUSERR)
176	ret \|= ATA_DMA_ERR;
177
178	return ret;
179	}
180
181	/*
182	* No IRQ register present so we do nothing.
183	*/
184	static void pxa_irq_clear(struct ata_port *ap)
185	{
186	}
187
188	/*
189	* Check for ATAPI DMA. ATAPI DMA is unsupported by this driver. It's still
190	* unclear why ATAPI has DMA issues.
191	*/
192	static int pxa_check_atapi_dma(struct ata_queued_cmd *qc)
193	{
194	return -EOPNOTSUPP;
195	}
196
197	static struct scsi_host_template pxa_ata_sht = {
198	ATA_BMDMA_SHT(DRV_NAME),
199	};
200
201	static struct ata_port_operations pxa_ata_port_ops = {
202	.inherits = &ata_bmdma_port_ops,
203	.cable_detect = ata_cable_40wire,
204
205	.bmdma_setup = pxa_bmdma_setup,
206	.bmdma_start = pxa_bmdma_start,
207	.bmdma_stop = pxa_bmdma_stop,
208	.bmdma_status = pxa_bmdma_status,
209
210	.check_atapi_dma = pxa_check_atapi_dma,
211
212	.sff_irq_clear = pxa_irq_clear,
213
214	.qc_prep = pxa_qc_prep,
215	};
216
217	/*
218	* DMA interrupt handler.
219	*/
220	static void pxa_ata_dma_irq(int dma, void *port)
221	{
222	struct ata_port *ap = port;
223	struct pata_pxa_data *pd = ap->private_data;
224
225	pd->dma_dcsr = DCSR(dma);
226	DCSR(dma) = pd->dma_dcsr;
227
228	if (pd->dma_dcsr & DCSR_STOPSTATE)
229	complete(&pd->dma_done);
230	}
231
232	static int __devinit pxa_ata_probe(struct platform_device *pdev)
233	{
234	struct ata_host *host;
235	struct ata_port *ap;
236	struct pata_pxa_data *data;
237	struct resource *cmd_res;
238	struct resource *ctl_res;
239	struct resource *dma_res;
240	struct resource *irq_res;
241	struct pata_pxa_pdata *pdata = pdev->dev.platform_data;
242	int ret = 0;
243
244	/*
245	* Resource validation, three resources are needed:
246	* - CMD port base address
247	* - CTL port base address
248	* - DMA port base address
249	* - IRQ pin
250	*/
251	if (pdev->num_resources != 4) {
252	dev_err(&pdev->dev, "invalid number of resources\n");
253	return -EINVAL;
254	}
255
256	/*
257	* CMD port base address
258	*/
259	cmd_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
260	if (unlikely(cmd_res == NULL))
261	return -EINVAL;
262
263	/*
264	* CTL port base address
265	*/
266	ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
267	if (unlikely(ctl_res == NULL))
268	return -EINVAL;
269
270	/*
271	* DMA port base address
272	*/
273	dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
274	if (unlikely(dma_res == NULL))
275	return -EINVAL;
276
277	/*
278	* IRQ pin
279	*/
280	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
281	if (unlikely(irq_res == NULL))
282	return -EINVAL;
283
284	/*
285	* Allocate the host
286	*/
287	host = ata_host_alloc(&pdev->dev, 1);
288	if (!host)
289	return -ENOMEM;
290
291	ap = host->ports[0];
292	ap->ops = &pxa_ata_port_ops;
293	ap->pio_mask = ATA_PIO4;
294	ap->mwdma_mask = ATA_MWDMA2;
295	ap->flags = ATA_FLAG_MMIO;
296
297	ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, cmd_res->start,
298	resource_size(cmd_res));
299	ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start,
300	resource_size(ctl_res));
301	ap->ioaddr.bmdma_addr = devm_ioremap(&pdev->dev, dma_res->start,
302	resource_size(dma_res));
303
304	/*
305	* Adjust register offsets
306	*/
307	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
308	ap->ioaddr.data_addr = ap->ioaddr.cmd_addr +
309	(ATA_REG_DATA << pdata->reg_shift);
310	ap->ioaddr.error_addr = ap->ioaddr.cmd_addr +
311	(ATA_REG_ERR << pdata->reg_shift);
312	ap->ioaddr.feature_addr = ap->ioaddr.cmd_addr +
313	(ATA_REG_FEATURE << pdata->reg_shift);
314	ap->ioaddr.nsect_addr = ap->ioaddr.cmd_addr +
315	(ATA_REG_NSECT << pdata->reg_shift);
316	ap->ioaddr.lbal_addr = ap->ioaddr.cmd_addr +
317	(ATA_REG_LBAL << pdata->reg_shift);
318	ap->ioaddr.lbam_addr = ap->ioaddr.cmd_addr +
319	(ATA_REG_LBAM << pdata->reg_shift);
320	ap->ioaddr.lbah_addr = ap->ioaddr.cmd_addr +
321	(ATA_REG_LBAH << pdata->reg_shift);
322	ap->ioaddr.device_addr = ap->ioaddr.cmd_addr +
323	(ATA_REG_DEVICE << pdata->reg_shift);
324	ap->ioaddr.status_addr = ap->ioaddr.cmd_addr +
325	(ATA_REG_STATUS << pdata->reg_shift);
326	ap->ioaddr.command_addr = ap->ioaddr.cmd_addr +
327	(ATA_REG_CMD << pdata->reg_shift);
328
329	/*
330	* Allocate and load driver's internal data structure
331	*/
332	data = devm_kzalloc(&pdev->dev, sizeof(struct pata_pxa_data),
333	GFP_KERNEL);
334	if (!data)
335	return -ENOMEM;
336
337	ap->private_data = data;
338	data->dma_dreq = pdata->dma_dreq;
339	data->dma_io_addr = dma_res->start;
340
341	/*
342	* Allocate space for the DMA descriptors
343	*/
344	data->dma_desc = dmam_alloc_coherent(&pdev->dev, PAGE_SIZE,
345	&data->dma_desc_addr, GFP_KERNEL);
346	if (!data->dma_desc)
347	return -EINVAL;
348
349	/*
350	* Request the DMA channel
351	*/
352	data->dma_channel = pxa_request_dma(DRV_NAME, DMA_PRIO_LOW,
353	pxa_ata_dma_irq, ap);
354	if (data->dma_channel < 0)
355	return -EBUSY;
356
357	/*
358	* Stop and clear the DMA channel
359	*/
360	DCSR(data->dma_channel) = 0;
361
362	/*
363	* Activate the ATA host
364	*/
365	ret = ata_host_activate(host, irq_res->start, ata_sff_interrupt,
366	pdata->irq_flags, &pxa_ata_sht);
367	if (ret)
368	pxa_free_dma(data->dma_channel);
369
370	return ret;
371	}
372
373	static int __devexit pxa_ata_remove(struct platform_device *pdev)
374	{
375	struct ata_host *host = dev_get_drvdata(&pdev->dev);
376	struct pata_pxa_data *data = host->ports[0]->private_data;
377
378	pxa_free_dma(data->dma_channel);
379
380	ata_host_detach(host);
381
382	return 0;
383	}
384
385	static struct platform_driver pxa_ata_driver = {
386	.probe = pxa_ata_probe,
387	.remove = __devexit_p(pxa_ata_remove),
388	.driver = {
389	.name = DRV_NAME,
390	.owner = THIS_MODULE,
391	},
392	};
393
394	static int __init pxa_ata_init(void)
395	{
396	return platform_driver_register(&pxa_ata_driver);
397	}
398
399	static void __exit pxa_ata_exit(void)
400	{
401	platform_driver_unregister(&pxa_ata_driver);
402	}
403
404	module_init(pxa_ata_init);
405	module_exit(pxa_ata_exit);
406
407	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
408	MODULE_DESCRIPTION("DMA-capable driver for PATA on PXA CPU");
409	MODULE_LICENSE("GPL");
410	MODULE_VERSION(DRV_VERSION);
411	MODULE_ALIAS("platform:" DRV_NAME);