1 /*
2 * Freescale iMX PATA driver
3 *
4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
5 *
6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 *
12 * TODO:
13 * - dmaengine support
14 */
15
16 #include <linux/ata.h>
17 #include <linux/clk.h>
18 #include <linux/libata.h>
19 #include <linux/module.h>
20 #include <linux/mod_devicetable.h>
21 #include <linux/platform_device.h>
22
23 #define DRV_NAME "pata_imx"
24
25 #define PATA_IMX_ATA_TIME_OFF 0x00
26 #define PATA_IMX_ATA_TIME_ON 0x01
27 #define PATA_IMX_ATA_TIME_1 0x02
28 #define PATA_IMX_ATA_TIME_2W 0x03
29 #define PATA_IMX_ATA_TIME_2R 0x04
30 #define PATA_IMX_ATA_TIME_AX 0x05
31 #define PATA_IMX_ATA_TIME_PIO_RDX 0x06
32 #define PATA_IMX_ATA_TIME_4 0x07
33 #define PATA_IMX_ATA_TIME_9 0x08
34
35 #define PATA_IMX_ATA_CONTROL 0x24
36 #define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
37 #define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
38 #define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
39 #define PATA_IMX_ATA_INT_EN 0x2C
40 #define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
41 #define PATA_IMX_DRIVE_DATA 0xA0
42 #define PATA_IMX_DRIVE_CONTROL 0xD8
43
44 static u32 pio_t4[] = { 30, 20, 15, 10, 10 };
45 static u32 pio_t9[] = { 20, 15, 10, 10, 10 };
46 static u32 pio_tA[] = { 35, 35, 35, 35, 35 };
47
48 struct pata_imx_priv {
49 struct clk *clk;
50 /* timings/interrupt/control regs */
51 void __iomem *host_regs;
52 u32 ata_ctl;
53 };
54
pata_imx_set_timing(struct ata_device * adev,struct pata_imx_priv * priv)55 static void pata_imx_set_timing(struct ata_device *adev,
56 struct pata_imx_priv *priv)
57 {
58 struct ata_timing timing;
59 unsigned long clkrate;
60 u32 T, mode;
61
62 clkrate = clk_get_rate(priv->clk);
63
64 if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
65 !clkrate)
66 return;
67
68 T = 1000000000 / clkrate;
69 ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);
70
71 mode = adev->pio_mode - XFER_PIO_0;
72
73 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
74 writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
75 writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
76 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
77 writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
78 writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);
79
80 writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
81 writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
82 writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
83 }
84
pata_imx_set_piomode(struct ata_port * ap,struct ata_device * adev)85 static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
86 {
87 struct pata_imx_priv *priv = ap->host->private_data;
88 u32 val;
89
90 pata_imx_set_timing(adev, priv);
91
92 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
93 if (ata_pio_need_iordy(adev))
94 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
95 else
96 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
97 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
98 }
99
100 static struct scsi_host_template pata_imx_sht = {
101 ATA_PIO_SHT(DRV_NAME),
102 };
103
104 static struct ata_port_operations pata_imx_port_ops = {
105 .inherits = &ata_sff_port_ops,
106 .sff_data_xfer = ata_sff_data_xfer32,
107 .cable_detect = ata_cable_unknown,
108 .set_piomode = pata_imx_set_piomode,
109 };
110
pata_imx_setup_port(struct ata_ioports * ioaddr)111 static void pata_imx_setup_port(struct ata_ioports *ioaddr)
112 {
113 /* Fixup the port shift for platforms that need it */
114 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
115 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
116 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
117 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
118 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
119 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
120 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
121 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
122 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
123 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
124 }
125
pata_imx_probe(struct platform_device * pdev)126 static int pata_imx_probe(struct platform_device *pdev)
127 {
128 struct ata_host *host;
129 struct ata_port *ap;
130 struct pata_imx_priv *priv;
131 int irq = 0;
132 struct resource *io_res;
133 int ret;
134
135 irq = platform_get_irq(pdev, 0);
136 if (irq < 0)
137 return irq;
138
139 priv = devm_kzalloc(&pdev->dev,
140 sizeof(struct pata_imx_priv), GFP_KERNEL);
141 if (!priv)
142 return -ENOMEM;
143
144 priv->clk = devm_clk_get(&pdev->dev, NULL);
145 if (IS_ERR(priv->clk)) {
146 dev_err(&pdev->dev, "Failed to get clock\n");
147 return PTR_ERR(priv->clk);
148 }
149
150 ret = clk_prepare_enable(priv->clk);
151 if (ret)
152 return ret;
153
154 host = ata_host_alloc(&pdev->dev, 1);
155 if (!host) {
156 ret = -ENOMEM;
157 goto err;
158 }
159
160 host->private_data = priv;
161 ap = host->ports[0];
162
163 ap->ops = &pata_imx_port_ops;
164 ap->pio_mask = ATA_PIO4;
165 ap->flags |= ATA_FLAG_SLAVE_POSS;
166
167 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
168 priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
169 if (IS_ERR(priv->host_regs)) {
170 ret = PTR_ERR(priv->host_regs);
171 goto err;
172 }
173
174 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
175 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
176
177 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
178
179 pata_imx_setup_port(&ap->ioaddr);
180
181 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
182 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
183 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
184
185 /* deassert resets */
186 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
187 PATA_IMX_ATA_CTRL_ATA_RST_B,
188 priv->host_regs + PATA_IMX_ATA_CONTROL);
189 /* enable interrupts */
190 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
191 priv->host_regs + PATA_IMX_ATA_INT_EN);
192
193 /* activate */
194 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
195 &pata_imx_sht);
196
197 if (ret)
198 goto err;
199
200 return 0;
201 err:
202 clk_disable_unprepare(priv->clk);
203
204 return ret;
205 }
206
pata_imx_remove(struct platform_device * pdev)207 static int pata_imx_remove(struct platform_device *pdev)
208 {
209 struct ata_host *host = platform_get_drvdata(pdev);
210 struct pata_imx_priv *priv = host->private_data;
211
212 ata_host_detach(host);
213
214 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
215
216 clk_disable_unprepare(priv->clk);
217
218 return 0;
219 }
220
221 #ifdef CONFIG_PM_SLEEP
pata_imx_suspend(struct device * dev)222 static int pata_imx_suspend(struct device *dev)
223 {
224 struct ata_host *host = dev_get_drvdata(dev);
225 struct pata_imx_priv *priv = host->private_data;
226 int ret;
227
228 ret = ata_host_suspend(host, PMSG_SUSPEND);
229 if (!ret) {
230 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
231 priv->ata_ctl =
232 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
233 clk_disable_unprepare(priv->clk);
234 }
235
236 return ret;
237 }
238
pata_imx_resume(struct device * dev)239 static int pata_imx_resume(struct device *dev)
240 {
241 struct ata_host *host = dev_get_drvdata(dev);
242 struct pata_imx_priv *priv = host->private_data;
243
244 int ret = clk_prepare_enable(priv->clk);
245 if (ret)
246 return ret;
247
248 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
249
250 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
251 priv->host_regs + PATA_IMX_ATA_INT_EN);
252
253 ata_host_resume(host);
254
255 return 0;
256 }
257 #endif
258
259 static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
260
261 static const struct of_device_id imx_pata_dt_ids[] = {
262 {
263 .compatible = "fsl,imx27-pata",
264 }, {
265 /* sentinel */
266 }
267 };
268 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
269
270 static struct platform_driver pata_imx_driver = {
271 .probe = pata_imx_probe,
272 .remove = pata_imx_remove,
273 .driver = {
274 .name = DRV_NAME,
275 .of_match_table = imx_pata_dt_ids,
276 .pm = &pata_imx_pm_ops,
277 },
278 };
279
280 module_platform_driver(pata_imx_driver);
281
282 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
283 MODULE_DESCRIPTION("low-level driver for iMX PATA");
284 MODULE_LICENSE("GPL");
285 MODULE_ALIAS("platform:" DRV_NAME);
286