summaryrefslogtreecommitdiff
path: root/drivers/ata/pata_imx.c
blob: 150939275b1b9411df3a0068c66e0f9035f4330f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * Freescale iMX PATA driver
 *
 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 * Based on pata_platform - Copyright (C) 2006 - 2007  Paul Mundt
 *
 * 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.
 *
 * TODO:
 * - dmaengine support
 */

#include <linux/ata.h>
#include <linux/clk.h>
#include <linux/libata.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>

#define DRV_NAME "pata_imx"

#define PATA_IMX_ATA_TIME_OFF		0x00
#define PATA_IMX_ATA_TIME_ON		0x01
#define PATA_IMX_ATA_TIME_1		0x02
#define PATA_IMX_ATA_TIME_2W		0x03
#define PATA_IMX_ATA_TIME_2R		0x04
#define PATA_IMX_ATA_TIME_AX		0x05
#define PATA_IMX_ATA_TIME_PIO_RDX	0x06
#define PATA_IMX_ATA_TIME_4		0x07
#define PATA_IMX_ATA_TIME_9		0x08

#define PATA_IMX_ATA_CONTROL		0x24
#define PATA_IMX_ATA_CTRL_FIFO_RST_B	(1<<7)
#define PATA_IMX_ATA_CTRL_ATA_RST_B	(1<<6)
#define PATA_IMX_ATA_CTRL_IORDY_EN	(1<<0)
#define PATA_IMX_ATA_INT_EN		0x2C
#define PATA_IMX_ATA_INTR_ATA_INTRQ2	(1<<3)
#define PATA_IMX_DRIVE_DATA		0xA0
#define PATA_IMX_DRIVE_CONTROL		0xD8

static u32 pio_t4[] = { 30,  20,  15,  10,  10 };
static u32 pio_t9[] = { 20,  15,  10,  10,  10 };
static u32 pio_tA[] = { 35,  35,  35,  35,  35 };

struct pata_imx_priv {
	struct clk *clk;
	/* timings/interrupt/control regs */
	void __iomem *host_regs;
	u32 ata_ctl;
};

static void pata_imx_set_timing(struct ata_device *adev,
				struct pata_imx_priv *priv)
{
	struct ata_timing timing;
	unsigned long clkrate;
	u32 T, mode;

	clkrate = clk_get_rate(priv->clk);

	if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
	    !clkrate)
		return;

	T = 1000000000 / clkrate;
	ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);

	mode = adev->pio_mode - XFER_PIO_0;

	writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
	writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
	writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
	writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
	writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
	writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);

	writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
	writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
	writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
}

static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	struct pata_imx_priv *priv = ap->host->private_data;
	u32 val;

	pata_imx_set_timing(adev, priv);

	val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
	if (ata_pio_need_iordy(adev))
		val |= PATA_IMX_ATA_CTRL_IORDY_EN;
	else
		val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
	__raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
}

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

static struct ata_port_operations pata_imx_port_ops = {
	.inherits		= &ata_sff_port_ops,
	.sff_data_xfer		= ata_sff_data_xfer32,
	.cable_detect		= ata_cable_unknown,
	.set_piomode		= pata_imx_set_piomode,
};

static void pata_imx_setup_port(struct ata_ioports *ioaddr)
{
	/* Fixup the port shift for platforms that need it */
	ioaddr->data_addr	= ioaddr->cmd_addr + (ATA_REG_DATA    << 2);
	ioaddr->error_addr	= ioaddr->cmd_addr + (ATA_REG_ERR     << 2);
	ioaddr->feature_addr	= ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
	ioaddr->nsect_addr	= ioaddr->cmd_addr + (ATA_REG_NSECT   << 2);
	ioaddr->lbal_addr	= ioaddr->cmd_addr + (ATA_REG_LBAL    << 2);
	ioaddr->lbam_addr	= ioaddr->cmd_addr + (ATA_REG_LBAM    << 2);
	ioaddr->lbah_addr	= ioaddr->cmd_addr + (ATA_REG_LBAH    << 2);
	ioaddr->device_addr	= ioaddr->cmd_addr + (ATA_REG_DEVICE  << 2);
	ioaddr->status_addr	= ioaddr->cmd_addr + (ATA_REG_STATUS  << 2);
	ioaddr->command_addr	= ioaddr->cmd_addr + (ATA_REG_CMD     << 2);
}

static int pata_imx_probe(struct platform_device *pdev)
{
	struct ata_host *host;
	struct ata_port *ap;
	struct pata_imx_priv *priv;
	int irq = 0;
	struct resource *io_res;
	int ret;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	priv = devm_kzalloc(&pdev->dev,
				sizeof(struct pata_imx_priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "Failed to get clock\n");
		return PTR_ERR(priv->clk);
	}

	ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	host = ata_host_alloc(&pdev->dev, 1);
	if (!host) {
		ret = -ENOMEM;
		goto err;
	}

	host->private_data = priv;
	ap = host->ports[0];

	ap->ops = &pata_imx_port_ops;
	ap->pio_mask = ATA_PIO4;
	ap->flags |= ATA_FLAG_SLAVE_POSS;

	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
	if (IS_ERR(priv->host_regs)) {
		ret = PTR_ERR(priv->host_regs);
		goto err;
	}

	ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
	ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;

	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;

	pata_imx_setup_port(&ap->ioaddr);

	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
		(unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
		(unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);

	/* deassert resets */
	__raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
			PATA_IMX_ATA_CTRL_ATA_RST_B,
			priv->host_regs + PATA_IMX_ATA_CONTROL);
	/* enable interrupts */
	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
			priv->host_regs + PATA_IMX_ATA_INT_EN);

	/* activate */
	ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
				&pata_imx_sht);

	if (ret)
		goto err;

	return 0;
err:
	clk_disable_unprepare(priv->clk);

	return ret;
}

static int pata_imx_remove(struct platform_device *pdev)
{
	struct ata_host *host = platform_get_drvdata(pdev);
	struct pata_imx_priv *priv = host->private_data;

	ata_host_detach(host);

	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);

	clk_disable_unprepare(priv->clk);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pata_imx_suspend(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct pata_imx_priv *priv = host->private_data;

	ata_host_suspend(host, PMSG_SUSPEND);

	__raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
	priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
	clk_disable_unprepare(priv->clk);

	return 0;
}

static int pata_imx_resume(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct pata_imx_priv *priv = host->private_data;

	int ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	__raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);

	__raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
			priv->host_regs + PATA_IMX_ATA_INT_EN);

	ata_host_resume(host);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);

static const struct of_device_id imx_pata_dt_ids[] = {
	{
		.compatible = "fsl,imx27-pata",
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);

static struct platform_driver pata_imx_driver = {
	.probe		= pata_imx_probe,
	.remove		= pata_imx_remove,
	.driver = {
		.name		= DRV_NAME,
		.of_match_table	= imx_pata_dt_ids,
		.pm		= &pata_imx_pm_ops,
	},
};

module_platform_driver(pata_imx_driver);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("low-level driver for iMX PATA");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);