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16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/blkdev.h>
20#include <scsi/scsi_host.h>
21#include <linux/ata.h>
22#include <linux/libata.h>
23#include <linux/platform_device.h>
24#include <linux/clk.h>
25
26#define DRV_NAME "pata_imx"
27
28#define PATA_IMX_ATA_CONTROL 0x24
29#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
30#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
31#define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
32#define PATA_IMX_ATA_INT_EN 0x2C
33#define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
34#define PATA_IMX_DRIVE_DATA 0xA0
35#define PATA_IMX_DRIVE_CONTROL 0xD8
36
37struct pata_imx_priv {
38 struct clk *clk;
39
40 void __iomem *host_regs;
41 u32 ata_ctl;
42};
43
44static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
45{
46 struct ata_device *dev;
47 struct ata_port *ap = link->ap;
48 struct pata_imx_priv *priv = ap->host->private_data;
49 u32 val;
50
51 ata_for_each_dev(dev, link, ENABLED) {
52 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
53 dev->xfer_shift = ATA_SHIFT_PIO;
54 dev->flags |= ATA_DFLAG_PIO;
55
56 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
57 if (ata_pio_need_iordy(dev))
58 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
59 else
60 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
61 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
62
63 ata_dev_info(dev, "configured for PIO\n");
64 }
65 return 0;
66}
67
68static struct scsi_host_template pata_imx_sht = {
69 ATA_PIO_SHT(DRV_NAME),
70};
71
72static struct ata_port_operations pata_imx_port_ops = {
73 .inherits = &ata_sff_port_ops,
74 .sff_data_xfer = ata_sff_data_xfer_noirq,
75 .cable_detect = ata_cable_unknown,
76 .set_mode = pata_imx_set_mode,
77};
78
79static void pata_imx_setup_port(struct ata_ioports *ioaddr)
80{
81
82 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
83 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
84 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
85 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
86 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
87 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
88 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
89 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
90 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
91 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
92}
93
94static int pata_imx_probe(struct platform_device *pdev)
95{
96 struct ata_host *host;
97 struct ata_port *ap;
98 struct pata_imx_priv *priv;
99 int irq = 0;
100 struct resource *io_res;
101 int ret;
102
103 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
104 if (io_res == NULL)
105 return -EINVAL;
106
107 irq = platform_get_irq(pdev, 0);
108 if (irq <= 0)
109 return -EINVAL;
110
111 priv = devm_kzalloc(&pdev->dev,
112 sizeof(struct pata_imx_priv), GFP_KERNEL);
113 if (!priv)
114 return -ENOMEM;
115
116 priv->clk = devm_clk_get(&pdev->dev, NULL);
117 if (IS_ERR(priv->clk)) {
118 dev_err(&pdev->dev, "Failed to get clock\n");
119 return PTR_ERR(priv->clk);
120 }
121
122 ret = clk_prepare_enable(priv->clk);
123 if (ret)
124 return ret;
125
126 host = ata_host_alloc(&pdev->dev, 1);
127 if (!host) {
128 ret = -ENOMEM;
129 goto err;
130 }
131
132 host->private_data = priv;
133 ap = host->ports[0];
134
135 ap->ops = &pata_imx_port_ops;
136 ap->pio_mask = ATA_PIO0;
137 ap->flags |= ATA_FLAG_SLAVE_POSS;
138
139 priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
140 resource_size(io_res));
141 if (!priv->host_regs) {
142 dev_err(&pdev->dev, "failed to map IO/CTL base\n");
143 ret = -EBUSY;
144 goto err;
145 }
146
147 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
148 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
149
150 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
151
152 pata_imx_setup_port(&ap->ioaddr);
153
154 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
155 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
156 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
157
158
159 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
160 PATA_IMX_ATA_CTRL_ATA_RST_B,
161 priv->host_regs + PATA_IMX_ATA_CONTROL);
162
163 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
164 priv->host_regs + PATA_IMX_ATA_INT_EN);
165
166
167 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
168 &pata_imx_sht);
169
170 if (ret)
171 goto err;
172
173 return 0;
174err:
175 clk_disable_unprepare(priv->clk);
176
177 return ret;
178}
179
180static int pata_imx_remove(struct platform_device *pdev)
181{
182 struct ata_host *host = platform_get_drvdata(pdev);
183 struct pata_imx_priv *priv = host->private_data;
184
185 ata_host_detach(host);
186
187 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
188
189 clk_disable_unprepare(priv->clk);
190
191 return 0;
192}
193
194#ifdef CONFIG_PM
195static int pata_imx_suspend(struct device *dev)
196{
197 struct ata_host *host = dev_get_drvdata(dev);
198 struct pata_imx_priv *priv = host->private_data;
199 int ret;
200
201 ret = ata_host_suspend(host, PMSG_SUSPEND);
202 if (!ret) {
203 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
204 priv->ata_ctl =
205 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
206 clk_disable_unprepare(priv->clk);
207 }
208
209 return ret;
210}
211
212static int pata_imx_resume(struct device *dev)
213{
214 struct ata_host *host = dev_get_drvdata(dev);
215 struct pata_imx_priv *priv = host->private_data;
216
217 int ret = clk_prepare_enable(priv->clk);
218 if (ret)
219 return ret;
220
221 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
222
223 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
224 priv->host_regs + PATA_IMX_ATA_INT_EN);
225
226 ata_host_resume(host);
227
228 return 0;
229}
230
231static const struct dev_pm_ops pata_imx_pm_ops = {
232 .suspend = pata_imx_suspend,
233 .resume = pata_imx_resume,
234};
235#endif
236
237static const struct of_device_id imx_pata_dt_ids[] = {
238 {
239 .compatible = "fsl,imx27-pata",
240 }, {
241
242 }
243};
244MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
245
246static struct platform_driver pata_imx_driver = {
247 .probe = pata_imx_probe,
248 .remove = pata_imx_remove,
249 .driver = {
250 .name = DRV_NAME,
251 .of_match_table = imx_pata_dt_ids,
252 .owner = THIS_MODULE,
253#ifdef CONFIG_PM
254 .pm = &pata_imx_pm_ops,
255#endif
256 },
257};
258
259module_platform_driver(pata_imx_driver);
260
261MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
262MODULE_DESCRIPTION("low-level driver for iMX PATA");
263MODULE_LICENSE("GPL");
264MODULE_ALIAS("platform:" DRV_NAME);
265
