Commit | Line | Data |
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657b306a KVA |
1 | /* |
2 | * omap-usb2.c - USB PHY, talking to musb controller in OMAP. | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * Author: Kishon Vijay Abraham I <kishon@ti.com> | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/io.h> | |
6284be23 | 24 | #include <linux/phy/omap_usb.h> |
657b306a KVA |
25 | #include <linux/usb/phy_companion.h> |
26 | #include <linux/clk.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/pm_runtime.h> | |
29 | #include <linux/delay.h> | |
14da699b | 30 | #include <linux/phy/omap_control_phy.h> |
5d93d1e7 | 31 | #include <linux/phy/phy.h> |
9955a783 KVA |
32 | #include <linux/mfd/syscon.h> |
33 | #include <linux/regmap.h> | |
478b6c74 | 34 | #include <linux/of_platform.h> |
657b306a | 35 | |
7e472402 AB |
36 | #define USB2PHY_DISCON_BYP_LATCH (1 << 31) |
37 | #define USB2PHY_ANA_CONFIG1 0x4c | |
38 | ||
657b306a KVA |
39 | /** |
40 | * omap_usb2_set_comparator - links the comparator present in the sytem with | |
41 | * this phy | |
42 | * @comparator - the companion phy(comparator) for this phy | |
43 | * | |
44 | * The phy companion driver should call this API passing the phy_companion | |
45 | * filled with set_vbus and start_srp to be used by usb phy. | |
46 | * | |
47 | * For use by phy companion driver | |
48 | */ | |
49 | int omap_usb2_set_comparator(struct phy_companion *comparator) | |
50 | { | |
51 | struct omap_usb *phy; | |
52 | struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2); | |
53 | ||
54 | if (IS_ERR(x)) | |
55 | return -ENODEV; | |
56 | ||
57 | phy = phy_to_omapusb(x); | |
58 | phy->comparator = comparator; | |
59 | return 0; | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(omap_usb2_set_comparator); | |
62 | ||
657b306a KVA |
63 | static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled) |
64 | { | |
19c1eac2 | 65 | struct omap_usb *phy = phy_to_omapusb(otg->usb_phy); |
657b306a KVA |
66 | |
67 | if (!phy->comparator) | |
68 | return -ENODEV; | |
69 | ||
70 | return phy->comparator->set_vbus(phy->comparator, enabled); | |
71 | } | |
72 | ||
73 | static int omap_usb_start_srp(struct usb_otg *otg) | |
74 | { | |
19c1eac2 | 75 | struct omap_usb *phy = phy_to_omapusb(otg->usb_phy); |
657b306a KVA |
76 | |
77 | if (!phy->comparator) | |
78 | return -ENODEV; | |
79 | ||
80 | return phy->comparator->start_srp(phy->comparator); | |
81 | } | |
82 | ||
83 | static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host) | |
84 | { | |
657b306a KVA |
85 | otg->host = host; |
86 | if (!host) | |
e47d9254 | 87 | otg->state = OTG_STATE_UNDEFINED; |
657b306a KVA |
88 | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static int omap_usb_set_peripheral(struct usb_otg *otg, | |
93 | struct usb_gadget *gadget) | |
94 | { | |
657b306a KVA |
95 | otg->gadget = gadget; |
96 | if (!gadget) | |
e47d9254 | 97 | otg->state = OTG_STATE_UNDEFINED; |
657b306a KVA |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
9955a783 KVA |
102 | static int omap_usb_phy_power(struct omap_usb *phy, int on) |
103 | { | |
104 | u32 val; | |
105 | int ret; | |
106 | ||
107 | if (!phy->syscon_phy_power) { | |
108 | omap_control_phy_power(phy->control_dev, on); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | if (on) | |
113 | val = phy->power_on; | |
114 | else | |
115 | val = phy->power_off; | |
116 | ||
117 | ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg, | |
118 | phy->mask, val); | |
119 | return ret; | |
120 | } | |
121 | ||
5d93d1e7 KVA |
122 | static int omap_usb_power_off(struct phy *x) |
123 | { | |
124 | struct omap_usb *phy = phy_get_drvdata(x); | |
125 | ||
9955a783 | 126 | return omap_usb_phy_power(phy, false); |
5d93d1e7 KVA |
127 | } |
128 | ||
129 | static int omap_usb_power_on(struct phy *x) | |
130 | { | |
131 | struct omap_usb *phy = phy_get_drvdata(x); | |
132 | ||
9955a783 | 133 | return omap_usb_phy_power(phy, true); |
5d93d1e7 KVA |
134 | } |
135 | ||
7e472402 AB |
136 | static int omap_usb_init(struct phy *x) |
137 | { | |
138 | struct omap_usb *phy = phy_get_drvdata(x); | |
139 | u32 val; | |
140 | ||
141 | if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { | |
142 | /* | |
143 | * | |
144 | * Reduce the sensitivity of internal PHY by enabling the | |
145 | * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This | |
146 | * resolves issues with certain devices which can otherwise | |
147 | * be prone to false disconnects. | |
148 | * | |
149 | */ | |
150 | val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1); | |
151 | val |= USB2PHY_DISCON_BYP_LATCH; | |
152 | omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val); | |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
4a9e5ca1 | 158 | static const struct phy_ops ops = { |
7e472402 | 159 | .init = omap_usb_init, |
5d93d1e7 KVA |
160 | .power_on = omap_usb_power_on, |
161 | .power_off = omap_usb_power_off, | |
162 | .owner = THIS_MODULE, | |
163 | }; | |
164 | ||
09a0168d GC |
165 | static const struct usb_phy_data omap_usb2_data = { |
166 | .label = "omap_usb2", | |
167 | .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS, | |
9955a783 KVA |
168 | .mask = OMAP_DEV_PHY_PD, |
169 | .power_off = OMAP_DEV_PHY_PD, | |
09a0168d GC |
170 | }; |
171 | ||
db68e80f GC |
172 | static const struct usb_phy_data omap5_usb2_data = { |
173 | .label = "omap5_usb2", | |
174 | .flags = 0, | |
9955a783 KVA |
175 | .mask = OMAP_DEV_PHY_PD, |
176 | .power_off = OMAP_DEV_PHY_PD, | |
db68e80f GC |
177 | }; |
178 | ||
7e472402 AB |
179 | static const struct usb_phy_data dra7x_usb2_data = { |
180 | .label = "dra7x_usb2", | |
181 | .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT, | |
9955a783 KVA |
182 | .mask = OMAP_DEV_PHY_PD, |
183 | .power_off = OMAP_DEV_PHY_PD, | |
184 | }; | |
185 | ||
186 | static const struct usb_phy_data dra7x_usb2_phy2_data = { | |
187 | .label = "dra7x_usb2_phy2", | |
188 | .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT, | |
189 | .mask = OMAP_USB2_PHY_PD, | |
190 | .power_off = OMAP_USB2_PHY_PD, | |
7e472402 AB |
191 | }; |
192 | ||
09a0168d GC |
193 | static const struct usb_phy_data am437x_usb2_data = { |
194 | .label = "am437x_usb2", | |
195 | .flags = 0, | |
9955a783 KVA |
196 | .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD | |
197 | AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN, | |
198 | .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN, | |
199 | .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD, | |
09a0168d GC |
200 | }; |
201 | ||
202 | static const struct of_device_id omap_usb2_id_table[] = { | |
203 | { | |
204 | .compatible = "ti,omap-usb2", | |
205 | .data = &omap_usb2_data, | |
206 | }, | |
db68e80f GC |
207 | { |
208 | .compatible = "ti,omap5-usb2", | |
209 | .data = &omap5_usb2_data, | |
210 | }, | |
7e472402 AB |
211 | { |
212 | .compatible = "ti,dra7x-usb2", | |
213 | .data = &dra7x_usb2_data, | |
214 | }, | |
9955a783 KVA |
215 | { |
216 | .compatible = "ti,dra7x-usb2-phy2", | |
217 | .data = &dra7x_usb2_phy2_data, | |
218 | }, | |
09a0168d GC |
219 | { |
220 | .compatible = "ti,am437x-usb2", | |
221 | .data = &am437x_usb2_data, | |
222 | }, | |
223 | {}, | |
224 | }; | |
225 | MODULE_DEVICE_TABLE(of, omap_usb2_id_table); | |
09a0168d | 226 | |
41ac7b3a | 227 | static int omap_usb2_probe(struct platform_device *pdev) |
657b306a | 228 | { |
478b6c74 RQ |
229 | struct omap_usb *phy; |
230 | struct phy *generic_phy; | |
7e472402 | 231 | struct resource *res; |
478b6c74 RQ |
232 | struct phy_provider *phy_provider; |
233 | struct usb_otg *otg; | |
234 | struct device_node *node = pdev->dev.of_node; | |
235 | struct device_node *control_node; | |
236 | struct platform_device *control_pdev; | |
09a0168d GC |
237 | const struct of_device_id *of_id; |
238 | struct usb_phy_data *phy_data; | |
239 | ||
52a4a72a | 240 | of_id = of_match_device(omap_usb2_id_table, &pdev->dev); |
478b6c74 | 241 | |
09a0168d | 242 | if (!of_id) |
478b6c74 | 243 | return -EINVAL; |
657b306a | 244 | |
09a0168d GC |
245 | phy_data = (struct usb_phy_data *)of_id->data; |
246 | ||
657b306a | 247 | phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); |
0b68253d | 248 | if (!phy) |
657b306a | 249 | return -ENOMEM; |
657b306a KVA |
250 | |
251 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); | |
0b68253d | 252 | if (!otg) |
657b306a | 253 | return -ENOMEM; |
657b306a KVA |
254 | |
255 | phy->dev = &pdev->dev; | |
256 | ||
257 | phy->phy.dev = phy->dev; | |
09a0168d | 258 | phy->phy.label = phy_data->label; |
657b306a | 259 | phy->phy.otg = otg; |
c11747f6 | 260 | phy->phy.type = USB_PHY_TYPE_USB2; |
9955a783 KVA |
261 | phy->mask = phy_data->mask; |
262 | phy->power_on = phy_data->power_on; | |
263 | phy->power_off = phy_data->power_off; | |
657b306a | 264 | |
7e472402 AB |
265 | if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { |
266 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
267 | phy->phy_base = devm_ioremap_resource(&pdev->dev, res); | |
3df9fcd5 HS |
268 | if (IS_ERR(phy->phy_base)) |
269 | return PTR_ERR(phy->phy_base); | |
7e472402 AB |
270 | phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT; |
271 | } | |
272 | ||
9955a783 KVA |
273 | phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node, |
274 | "syscon-phy-power"); | |
275 | if (IS_ERR(phy->syscon_phy_power)) { | |
276 | dev_dbg(&pdev->dev, | |
277 | "can't get syscon-phy-power, using control device\n"); | |
278 | phy->syscon_phy_power = NULL; | |
279 | ||
280 | control_node = of_parse_phandle(node, "ctrl-module", 0); | |
281 | if (!control_node) { | |
282 | dev_err(&pdev->dev, | |
283 | "Failed to get control device phandle\n"); | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | control_pdev = of_find_device_by_node(control_node); | |
288 | if (!control_pdev) { | |
289 | dev_err(&pdev->dev, "Failed to get control device\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | phy->control_dev = &control_pdev->dev; | |
293 | } else { | |
294 | if (of_property_read_u32_index(node, | |
295 | "syscon-phy-power", 1, | |
296 | &phy->power_reg)) { | |
297 | dev_err(&pdev->dev, | |
298 | "couldn't get power reg. offset\n"); | |
299 | return -EINVAL; | |
300 | } | |
657b306a KVA |
301 | } |
302 | ||
657b306a KVA |
303 | otg->set_host = omap_usb_set_host; |
304 | otg->set_peripheral = omap_usb_set_peripheral; | |
09a0168d GC |
305 | if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS) |
306 | otg->set_vbus = omap_usb_set_vbus; | |
307 | if (phy_data->flags & OMAP_USB2_HAS_START_SRP) | |
308 | otg->start_srp = omap_usb_start_srp; | |
19c1eac2 | 309 | otg->usb_phy = &phy->phy; |
657b306a | 310 | |
5d93d1e7 | 311 | platform_set_drvdata(pdev, phy); |
f20531a9 | 312 | pm_runtime_enable(phy->dev); |
5d93d1e7 | 313 | |
dbc98635 | 314 | generic_phy = devm_phy_create(phy->dev, NULL, &ops); |
f20531a9 OG |
315 | if (IS_ERR(generic_phy)) { |
316 | pm_runtime_disable(phy->dev); | |
5d93d1e7 | 317 | return PTR_ERR(generic_phy); |
f20531a9 | 318 | } |
5d93d1e7 KVA |
319 | |
320 | phy_set_drvdata(generic_phy, phy); | |
86c574e4 | 321 | omap_usb_power_off(generic_phy); |
5d93d1e7 | 322 | |
64fe1891 KVA |
323 | phy_provider = devm_of_phy_provider_register(phy->dev, |
324 | of_phy_simple_xlate); | |
eb82a3d8 RQ |
325 | if (IS_ERR(phy_provider)) { |
326 | pm_runtime_disable(phy->dev); | |
64fe1891 | 327 | return PTR_ERR(phy_provider); |
eb82a3d8 | 328 | } |
64fe1891 | 329 | |
9f1d8ed2 | 330 | phy->wkupclk = devm_clk_get(phy->dev, "wkupclk"); |
657b306a | 331 | if (IS_ERR(phy->wkupclk)) { |
9f1d8ed2 RQ |
332 | dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n"); |
333 | phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); | |
334 | if (IS_ERR(phy->wkupclk)) { | |
335 | dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); | |
4581f798 | 336 | pm_runtime_disable(phy->dev); |
9f1d8ed2 RQ |
337 | return PTR_ERR(phy->wkupclk); |
338 | } else { | |
339 | dev_warn(&pdev->dev, | |
340 | "found usb_phy_cm_clk32k, please fix DTS\n"); | |
341 | } | |
657b306a KVA |
342 | } |
343 | clk_prepare(phy->wkupclk); | |
344 | ||
9f1d8ed2 RQ |
345 | phy->optclk = devm_clk_get(phy->dev, "refclk"); |
346 | if (IS_ERR(phy->optclk)) { | |
347 | dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n"); | |
348 | phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m"); | |
349 | if (IS_ERR(phy->optclk)) { | |
350 | dev_dbg(&pdev->dev, | |
351 | "unable to get usb_otg_ss_refclk960m\n"); | |
352 | } else { | |
353 | dev_warn(&pdev->dev, | |
354 | "found usb_otg_ss_refclk960m, please fix DTS\n"); | |
355 | } | |
9f1d8ed2 | 356 | } |
0c4c8bbb | 357 | |
b1ff3231 AL |
358 | if (!IS_ERR(phy->optclk)) |
359 | clk_prepare(phy->optclk); | |
360 | ||
c11747f6 | 361 | usb_add_phy_dev(&phy->phy); |
657b306a | 362 | |
657b306a KVA |
363 | return 0; |
364 | } | |
365 | ||
fb4e98ab | 366 | static int omap_usb2_remove(struct platform_device *pdev) |
657b306a KVA |
367 | { |
368 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
369 | ||
370 | clk_unprepare(phy->wkupclk); | |
0c4c8bbb KVA |
371 | if (!IS_ERR(phy->optclk)) |
372 | clk_unprepare(phy->optclk); | |
657b306a | 373 | usb_remove_phy(&phy->phy); |
eb82a3d8 | 374 | pm_runtime_disable(phy->dev); |
657b306a KVA |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
7ba37053 | 379 | #ifdef CONFIG_PM |
657b306a KVA |
380 | |
381 | static int omap_usb2_runtime_suspend(struct device *dev) | |
382 | { | |
383 | struct platform_device *pdev = to_platform_device(dev); | |
384 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
385 | ||
386 | clk_disable(phy->wkupclk); | |
0c4c8bbb KVA |
387 | if (!IS_ERR(phy->optclk)) |
388 | clk_disable(phy->optclk); | |
657b306a KVA |
389 | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static int omap_usb2_runtime_resume(struct device *dev) | |
394 | { | |
657b306a KVA |
395 | struct platform_device *pdev = to_platform_device(dev); |
396 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
0f827684 | 397 | int ret; |
657b306a KVA |
398 | |
399 | ret = clk_enable(phy->wkupclk); | |
0c4c8bbb | 400 | if (ret < 0) { |
657b306a | 401 | dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); |
0c4c8bbb KVA |
402 | goto err0; |
403 | } | |
404 | ||
405 | if (!IS_ERR(phy->optclk)) { | |
406 | ret = clk_enable(phy->optclk); | |
407 | if (ret < 0) { | |
408 | dev_err(phy->dev, "Failed to enable optclk %d\n", ret); | |
409 | goto err1; | |
410 | } | |
411 | } | |
412 | ||
413 | return 0; | |
414 | ||
415 | err1: | |
416 | clk_disable(phy->wkupclk); | |
657b306a | 417 | |
0c4c8bbb | 418 | err0: |
657b306a KVA |
419 | return ret; |
420 | } | |
421 | ||
422 | static const struct dev_pm_ops omap_usb2_pm_ops = { | |
423 | SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, | |
424 | NULL) | |
425 | }; | |
426 | ||
427 | #define DEV_PM_OPS (&omap_usb2_pm_ops) | |
428 | #else | |
429 | #define DEV_PM_OPS NULL | |
430 | #endif | |
431 | ||
657b306a KVA |
432 | static struct platform_driver omap_usb2_driver = { |
433 | .probe = omap_usb2_probe, | |
7690417d | 434 | .remove = omap_usb2_remove, |
657b306a KVA |
435 | .driver = { |
436 | .name = "omap-usb2", | |
657b306a | 437 | .pm = DEV_PM_OPS, |
52a4a72a | 438 | .of_match_table = omap_usb2_id_table, |
657b306a KVA |
439 | }, |
440 | }; | |
441 | ||
442 | module_platform_driver(omap_usb2_driver); | |
443 | ||
dd64ad38 | 444 | MODULE_ALIAS("platform:omap_usb2"); |
657b306a KVA |
445 | MODULE_AUTHOR("Texas Instruments Inc."); |
446 | MODULE_DESCRIPTION("OMAP USB2 phy driver"); | |
447 | MODULE_LICENSE("GPL v2"); |