1 /*
2 * Copyright 2012 Freescale Semiconductor, Inc.
3 *
4 * The code contained herein is licensed under the GNU General Public
5 * License. You may obtain a copy of the GNU General Public License
6 * Version 2 or later at the following locations:
7 *
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
10 */
11
12 #include <linux/module.h>
13 #include <linux/of_platform.h>
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/io.h>
17 #include <linux/delay.h>
18
19 #include "ci_hdrc_imx.h"
20
21 #define MX25_USB_PHY_CTRL_OFFSET 0x08
22 #define MX25_BM_EXTERNAL_VBUS_DIVIDER BIT(23)
23
24 #define MX25_EHCI_INTERFACE_SINGLE_UNI (2 << 0)
25 #define MX25_EHCI_INTERFACE_DIFF_UNI (0 << 0)
26 #define MX25_EHCI_INTERFACE_MASK (0xf)
27
28 #define MX25_OTG_SIC_SHIFT 29
29 #define MX25_OTG_SIC_MASK (0x3 << MX25_OTG_SIC_SHIFT)
30 #define MX25_OTG_PM_BIT BIT(24)
31 #define MX25_OTG_PP_BIT BIT(11)
32 #define MX25_OTG_OCPOL_BIT BIT(3)
33
34 #define MX25_H1_SIC_SHIFT 21
35 #define MX25_H1_SIC_MASK (0x3 << MX25_H1_SIC_SHIFT)
36 #define MX25_H1_PP_BIT BIT(18)
37 #define MX25_H1_PM_BIT BIT(16)
38 #define MX25_H1_IPPUE_UP_BIT BIT(7)
39 #define MX25_H1_IPPUE_DOWN_BIT BIT(6)
40 #define MX25_H1_TLL_BIT BIT(5)
41 #define MX25_H1_USBTE_BIT BIT(4)
42 #define MX25_H1_OCPOL_BIT BIT(2)
43
44 #define MX27_H1_PM_BIT BIT(8)
45 #define MX27_H2_PM_BIT BIT(16)
46 #define MX27_OTG_PM_BIT BIT(24)
47
48 #define MX53_USB_OTG_PHY_CTRL_0_OFFSET 0x08
49 #define MX53_USB_OTG_PHY_CTRL_1_OFFSET 0x0c
50 #define MX53_USB_UH2_CTRL_OFFSET 0x14
51 #define MX53_USB_UH3_CTRL_OFFSET 0x18
52 #define MX53_BM_OVER_CUR_DIS_H1 BIT(5)
53 #define MX53_BM_OVER_CUR_DIS_OTG BIT(8)
54 #define MX53_BM_OVER_CUR_DIS_UHx BIT(30)
55 #define MX53_USB_PHYCTRL1_PLLDIV_MASK 0x3
56 #define MX53_USB_PLL_DIV_24_MHZ 0x01
57
58 #define MX6_BM_OVER_CUR_DIS BIT(7)
59
60 #define VF610_OVER_CUR_DIS BIT(7)
61
62 struct usbmisc_ops {
63 /* It's called once when probe a usb device */
64 int (*init)(struct imx_usbmisc_data *data);
65 /* It's called once after adding a usb device */
66 int (*post)(struct imx_usbmisc_data *data);
67 };
68
69 struct imx_usbmisc {
70 void __iomem *base;
71 spinlock_t lock;
72 struct clk *clk;
73 const struct usbmisc_ops *ops;
74 };
75
usbmisc_imx25_init(struct imx_usbmisc_data * data)76 static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
77 {
78 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
79 unsigned long flags;
80 u32 val = 0;
81
82 if (data->index > 1)
83 return -EINVAL;
84
85 spin_lock_irqsave(&usbmisc->lock, flags);
86 switch (data->index) {
87 case 0:
88 val = readl(usbmisc->base);
89 val &= ~(MX25_OTG_SIC_MASK | MX25_OTG_PP_BIT);
90 val |= (MX25_EHCI_INTERFACE_DIFF_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_OTG_SIC_SHIFT;
91 val |= (MX25_OTG_PM_BIT | MX25_OTG_OCPOL_BIT);
92 writel(val, usbmisc->base);
93 break;
94 case 1:
95 val = readl(usbmisc->base);
96 val &= ~(MX25_H1_SIC_MASK | MX25_H1_PP_BIT | MX25_H1_IPPUE_UP_BIT);
97 val |= (MX25_EHCI_INTERFACE_SINGLE_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_H1_SIC_SHIFT;
98 val |= (MX25_H1_PM_BIT | MX25_H1_OCPOL_BIT | MX25_H1_TLL_BIT |
99 MX25_H1_USBTE_BIT | MX25_H1_IPPUE_DOWN_BIT);
100
101 writel(val, usbmisc->base);
102
103 break;
104 }
105 spin_unlock_irqrestore(&usbmisc->lock, flags);
106
107 return 0;
108 }
109
usbmisc_imx25_post(struct imx_usbmisc_data * data)110 static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
111 {
112 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
113 void __iomem *reg;
114 unsigned long flags;
115 u32 val;
116
117 if (data->index > 2)
118 return -EINVAL;
119
120 reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;
121
122 if (data->evdo) {
123 spin_lock_irqsave(&usbmisc->lock, flags);
124 val = readl(reg);
125 writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
126 spin_unlock_irqrestore(&usbmisc->lock, flags);
127 usleep_range(5000, 10000); /* needed to stabilize voltage */
128 }
129
130 return 0;
131 }
132
usbmisc_imx27_init(struct imx_usbmisc_data * data)133 static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
134 {
135 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
136 unsigned long flags;
137 u32 val;
138
139 switch (data->index) {
140 case 0:
141 val = MX27_OTG_PM_BIT;
142 break;
143 case 1:
144 val = MX27_H1_PM_BIT;
145 break;
146 case 2:
147 val = MX27_H2_PM_BIT;
148 break;
149 default:
150 return -EINVAL;
151 };
152
153 spin_lock_irqsave(&usbmisc->lock, flags);
154 if (data->disable_oc)
155 val = readl(usbmisc->base) | val;
156 else
157 val = readl(usbmisc->base) & ~val;
158 writel(val, usbmisc->base);
159 spin_unlock_irqrestore(&usbmisc->lock, flags);
160
161 return 0;
162 }
163
usbmisc_imx53_init(struct imx_usbmisc_data * data)164 static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
165 {
166 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
167 void __iomem *reg = NULL;
168 unsigned long flags;
169 u32 val = 0;
170
171 if (data->index > 3)
172 return -EINVAL;
173
174 /* Select a 24 MHz reference clock for the PHY */
175 reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET;
176 val = readl(reg);
177 val &= ~MX53_USB_PHYCTRL1_PLLDIV_MASK;
178 val |= MX53_USB_PLL_DIV_24_MHZ;
179 writel(val, usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET);
180
181 if (data->disable_oc) {
182 spin_lock_irqsave(&usbmisc->lock, flags);
183 switch (data->index) {
184 case 0:
185 reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
186 val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
187 break;
188 case 1:
189 reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
190 val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
191 break;
192 case 2:
193 reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
194 val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
195 break;
196 case 3:
197 reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
198 val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
199 break;
200 }
201 if (reg && val)
202 writel(val, reg);
203 spin_unlock_irqrestore(&usbmisc->lock, flags);
204 }
205
206 return 0;
207 }
208
usbmisc_imx6q_init(struct imx_usbmisc_data * data)209 static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
210 {
211 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
212 unsigned long flags;
213 u32 reg;
214
215 if (data->index > 3)
216 return -EINVAL;
217
218 if (data->disable_oc) {
219 spin_lock_irqsave(&usbmisc->lock, flags);
220 reg = readl(usbmisc->base + data->index * 4);
221 writel(reg | MX6_BM_OVER_CUR_DIS,
222 usbmisc->base + data->index * 4);
223 spin_unlock_irqrestore(&usbmisc->lock, flags);
224 }
225
226 return 0;
227 }
228
usbmisc_vf610_init(struct imx_usbmisc_data * data)229 static int usbmisc_vf610_init(struct imx_usbmisc_data *data)
230 {
231 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
232 u32 reg;
233
234 /*
235 * Vybrid only has one misc register set, but in two different
236 * areas. These is reflected in two instances of this driver.
237 */
238 if (data->index >= 1)
239 return -EINVAL;
240
241 if (data->disable_oc) {
242 reg = readl(usbmisc->base);
243 writel(reg | VF610_OVER_CUR_DIS, usbmisc->base);
244 }
245
246 return 0;
247 }
248
249 static const struct usbmisc_ops imx25_usbmisc_ops = {
250 .init = usbmisc_imx25_init,
251 .post = usbmisc_imx25_post,
252 };
253
254 static const struct usbmisc_ops imx27_usbmisc_ops = {
255 .init = usbmisc_imx27_init,
256 };
257
258 static const struct usbmisc_ops imx53_usbmisc_ops = {
259 .init = usbmisc_imx53_init,
260 };
261
262 static const struct usbmisc_ops imx6q_usbmisc_ops = {
263 .init = usbmisc_imx6q_init,
264 };
265
266 static const struct usbmisc_ops vf610_usbmisc_ops = {
267 .init = usbmisc_vf610_init,
268 };
269
imx_usbmisc_init(struct imx_usbmisc_data * data)270 int imx_usbmisc_init(struct imx_usbmisc_data *data)
271 {
272 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
273
274 if (!usbmisc->ops->init)
275 return 0;
276 return usbmisc->ops->init(data);
277 }
278 EXPORT_SYMBOL_GPL(imx_usbmisc_init);
279
imx_usbmisc_init_post(struct imx_usbmisc_data * data)280 int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
281 {
282 struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
283
284 if (!usbmisc->ops->post)
285 return 0;
286 return usbmisc->ops->post(data);
287 }
288 EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);
289
290 static const struct of_device_id usbmisc_imx_dt_ids[] = {
291 {
292 .compatible = "fsl,imx25-usbmisc",
293 .data = &imx25_usbmisc_ops,
294 },
295 {
296 .compatible = "fsl,imx35-usbmisc",
297 .data = &imx25_usbmisc_ops,
298 },
299 {
300 .compatible = "fsl,imx27-usbmisc",
301 .data = &imx27_usbmisc_ops,
302 },
303 {
304 .compatible = "fsl,imx51-usbmisc",
305 .data = &imx53_usbmisc_ops,
306 },
307 {
308 .compatible = "fsl,imx53-usbmisc",
309 .data = &imx53_usbmisc_ops,
310 },
311 {
312 .compatible = "fsl,imx6q-usbmisc",
313 .data = &imx6q_usbmisc_ops,
314 },
315 {
316 .compatible = "fsl,vf610-usbmisc",
317 .data = &vf610_usbmisc_ops,
318 },
319 { /* sentinel */ }
320 };
321 MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
322
usbmisc_imx_probe(struct platform_device * pdev)323 static int usbmisc_imx_probe(struct platform_device *pdev)
324 {
325 struct resource *res;
326 struct imx_usbmisc *data;
327 int ret;
328 struct of_device_id *tmp_dev;
329
330 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
331 if (!data)
332 return -ENOMEM;
333
334 spin_lock_init(&data->lock);
335
336 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
337 data->base = devm_ioremap_resource(&pdev->dev, res);
338 if (IS_ERR(data->base))
339 return PTR_ERR(data->base);
340
341 data->clk = devm_clk_get(&pdev->dev, NULL);
342 if (IS_ERR(data->clk)) {
343 dev_err(&pdev->dev,
344 "failed to get clock, err=%ld\n", PTR_ERR(data->clk));
345 return PTR_ERR(data->clk);
346 }
347
348 ret = clk_prepare_enable(data->clk);
349 if (ret) {
350 dev_err(&pdev->dev,
351 "clk_prepare_enable failed, err=%d\n", ret);
352 return ret;
353 }
354
355 tmp_dev = (struct of_device_id *)
356 of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
357 data->ops = (const struct usbmisc_ops *)tmp_dev->data;
358 platform_set_drvdata(pdev, data);
359
360 return 0;
361 }
362
usbmisc_imx_remove(struct platform_device * pdev)363 static int usbmisc_imx_remove(struct platform_device *pdev)
364 {
365 struct imx_usbmisc *usbmisc = dev_get_drvdata(&pdev->dev);
366 clk_disable_unprepare(usbmisc->clk);
367 return 0;
368 }
369
370 static struct platform_driver usbmisc_imx_driver = {
371 .probe = usbmisc_imx_probe,
372 .remove = usbmisc_imx_remove,
373 .driver = {
374 .name = "usbmisc_imx",
375 .owner = THIS_MODULE,
376 .of_match_table = usbmisc_imx_dt_ids,
377 },
378 };
379
380 module_platform_driver(usbmisc_imx_driver);
381
382 MODULE_ALIAS("platform:usbmisc-imx");
383 MODULE_LICENSE("GPL v2");
384 MODULE_DESCRIPTION("driver for imx usb non-core registers");
385 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
386