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
|
/*
* 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
* - check if timing stuff needed
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#define DRV_NAME "pata_imx"
#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
struct pata_imx_priv {
struct clk *clk;
/* timings/interrupt/control regs */
void __iomem *host_regs;
u32 ata_ctl;
};
static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
{
struct ata_device *dev;
struct ata_port *ap = link->ap;
struct pata_imx_priv *priv = ap->host->private_data;
u32 val;
ata_for_each_dev(dev, link, ENABLED) {
dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
if (ata_pio_need_iordy(dev))
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);
ata_dev_info(dev, "configured for PIO\n");
}
return 0;
}
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_xfer_noirq,
.cable_detect = ata_cable_unknown,
.set_mode = pata_imx_set_mode,
};
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;
io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (io_res == NULL)
return -EINVAL;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return -EINVAL;
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);
}
clk_prepare_enable(priv->clk);
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_PIO0;
ap->flags |= ATA_FLAG_SLAVE_POSS;
priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
resource_size(io_res));
if (!priv->host_regs) {
dev_err(&pdev->dev, "failed to map IO/CTL base\n");
ret = -EBUSY;
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
static int pata_imx_suspend(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct pata_imx_priv *priv = host->private_data;
int ret;
ret = ata_host_suspend(host, PMSG_SUSPEND);
if (!ret) {
__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 ret;
}
static int pata_imx_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct pata_imx_priv *priv = host->private_data;
clk_prepare_enable(priv->clk);
__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;
}
static const struct dev_pm_ops pata_imx_pm_ops = {
.suspend = pata_imx_suspend,
.resume = pata_imx_resume,
};
#endif
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,
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &pata_imx_pm_ops,
#endif
},
};
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);
|
