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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 | ||
80fc6660 SN |
136 | static int omap_usb2_disable_clocks(struct omap_usb *phy) |
137 | { | |
138 | clk_disable(phy->wkupclk); | |
139 | if (!IS_ERR(phy->optclk)) | |
140 | clk_disable(phy->optclk); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int omap_usb2_enable_clocks(struct omap_usb *phy) | |
146 | { | |
147 | int ret; | |
148 | ||
149 | ret = clk_enable(phy->wkupclk); | |
150 | if (ret < 0) { | |
151 | dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); | |
152 | goto err0; | |
153 | } | |
154 | ||
155 | if (!IS_ERR(phy->optclk)) { | |
156 | ret = clk_enable(phy->optclk); | |
157 | if (ret < 0) { | |
158 | dev_err(phy->dev, "Failed to enable optclk %d\n", ret); | |
159 | goto err1; | |
160 | } | |
161 | } | |
162 | ||
163 | return 0; | |
164 | ||
165 | err1: | |
166 | clk_disable(phy->wkupclk); | |
167 | ||
168 | err0: | |
169 | return ret; | |
170 | } | |
171 | ||
7e472402 AB |
172 | static int omap_usb_init(struct phy *x) |
173 | { | |
174 | struct omap_usb *phy = phy_get_drvdata(x); | |
175 | u32 val; | |
176 | ||
80fc6660 SN |
177 | omap_usb2_enable_clocks(phy); |
178 | ||
7e472402 AB |
179 | if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { |
180 | /* | |
181 | * | |
182 | * Reduce the sensitivity of internal PHY by enabling the | |
183 | * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This | |
184 | * resolves issues with certain devices which can otherwise | |
185 | * be prone to false disconnects. | |
186 | * | |
187 | */ | |
188 | val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1); | |
189 | val |= USB2PHY_DISCON_BYP_LATCH; | |
190 | omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val); | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
80fc6660 SN |
196 | static int omap_usb_exit(struct phy *x) |
197 | { | |
198 | struct omap_usb *phy = phy_get_drvdata(x); | |
199 | ||
200 | return omap_usb2_disable_clocks(phy); | |
201 | } | |
202 | ||
4a9e5ca1 | 203 | static const struct phy_ops ops = { |
7e472402 | 204 | .init = omap_usb_init, |
80fc6660 | 205 | .exit = omap_usb_exit, |
5d93d1e7 KVA |
206 | .power_on = omap_usb_power_on, |
207 | .power_off = omap_usb_power_off, | |
208 | .owner = THIS_MODULE, | |
209 | }; | |
210 | ||
09a0168d GC |
211 | static const struct usb_phy_data omap_usb2_data = { |
212 | .label = "omap_usb2", | |
213 | .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS, | |
9955a783 KVA |
214 | .mask = OMAP_DEV_PHY_PD, |
215 | .power_off = OMAP_DEV_PHY_PD, | |
09a0168d GC |
216 | }; |
217 | ||
db68e80f GC |
218 | static const struct usb_phy_data omap5_usb2_data = { |
219 | .label = "omap5_usb2", | |
220 | .flags = 0, | |
9955a783 KVA |
221 | .mask = OMAP_DEV_PHY_PD, |
222 | .power_off = OMAP_DEV_PHY_PD, | |
db68e80f GC |
223 | }; |
224 | ||
7e472402 AB |
225 | static const struct usb_phy_data dra7x_usb2_data = { |
226 | .label = "dra7x_usb2", | |
227 | .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT, | |
9955a783 KVA |
228 | .mask = OMAP_DEV_PHY_PD, |
229 | .power_off = OMAP_DEV_PHY_PD, | |
230 | }; | |
231 | ||
232 | static const struct usb_phy_data dra7x_usb2_phy2_data = { | |
233 | .label = "dra7x_usb2_phy2", | |
234 | .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT, | |
235 | .mask = OMAP_USB2_PHY_PD, | |
236 | .power_off = OMAP_USB2_PHY_PD, | |
7e472402 AB |
237 | }; |
238 | ||
09a0168d GC |
239 | static const struct usb_phy_data am437x_usb2_data = { |
240 | .label = "am437x_usb2", | |
241 | .flags = 0, | |
9955a783 KVA |
242 | .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD | |
243 | AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN, | |
244 | .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN, | |
245 | .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD, | |
09a0168d GC |
246 | }; |
247 | ||
248 | static const struct of_device_id omap_usb2_id_table[] = { | |
249 | { | |
250 | .compatible = "ti,omap-usb2", | |
251 | .data = &omap_usb2_data, | |
252 | }, | |
db68e80f GC |
253 | { |
254 | .compatible = "ti,omap5-usb2", | |
255 | .data = &omap5_usb2_data, | |
256 | }, | |
7e472402 AB |
257 | { |
258 | .compatible = "ti,dra7x-usb2", | |
259 | .data = &dra7x_usb2_data, | |
260 | }, | |
9955a783 KVA |
261 | { |
262 | .compatible = "ti,dra7x-usb2-phy2", | |
263 | .data = &dra7x_usb2_phy2_data, | |
264 | }, | |
09a0168d GC |
265 | { |
266 | .compatible = "ti,am437x-usb2", | |
267 | .data = &am437x_usb2_data, | |
268 | }, | |
269 | {}, | |
270 | }; | |
271 | MODULE_DEVICE_TABLE(of, omap_usb2_id_table); | |
09a0168d | 272 | |
41ac7b3a | 273 | static int omap_usb2_probe(struct platform_device *pdev) |
657b306a | 274 | { |
478b6c74 RQ |
275 | struct omap_usb *phy; |
276 | struct phy *generic_phy; | |
7e472402 | 277 | struct resource *res; |
478b6c74 RQ |
278 | struct phy_provider *phy_provider; |
279 | struct usb_otg *otg; | |
280 | struct device_node *node = pdev->dev.of_node; | |
281 | struct device_node *control_node; | |
282 | struct platform_device *control_pdev; | |
09a0168d GC |
283 | const struct of_device_id *of_id; |
284 | struct usb_phy_data *phy_data; | |
285 | ||
52a4a72a | 286 | of_id = of_match_device(omap_usb2_id_table, &pdev->dev); |
478b6c74 | 287 | |
09a0168d | 288 | if (!of_id) |
478b6c74 | 289 | return -EINVAL; |
657b306a | 290 | |
09a0168d GC |
291 | phy_data = (struct usb_phy_data *)of_id->data; |
292 | ||
657b306a | 293 | phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); |
0b68253d | 294 | if (!phy) |
657b306a | 295 | return -ENOMEM; |
657b306a KVA |
296 | |
297 | otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); | |
0b68253d | 298 | if (!otg) |
657b306a | 299 | return -ENOMEM; |
657b306a KVA |
300 | |
301 | phy->dev = &pdev->dev; | |
302 | ||
303 | phy->phy.dev = phy->dev; | |
09a0168d | 304 | phy->phy.label = phy_data->label; |
657b306a | 305 | phy->phy.otg = otg; |
c11747f6 | 306 | phy->phy.type = USB_PHY_TYPE_USB2; |
9955a783 KVA |
307 | phy->mask = phy_data->mask; |
308 | phy->power_on = phy_data->power_on; | |
309 | phy->power_off = phy_data->power_off; | |
657b306a | 310 | |
7e472402 AB |
311 | if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { |
312 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
313 | phy->phy_base = devm_ioremap_resource(&pdev->dev, res); | |
3df9fcd5 HS |
314 | if (IS_ERR(phy->phy_base)) |
315 | return PTR_ERR(phy->phy_base); | |
7e472402 AB |
316 | phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT; |
317 | } | |
318 | ||
9955a783 KVA |
319 | phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node, |
320 | "syscon-phy-power"); | |
321 | if (IS_ERR(phy->syscon_phy_power)) { | |
322 | dev_dbg(&pdev->dev, | |
323 | "can't get syscon-phy-power, using control device\n"); | |
324 | phy->syscon_phy_power = NULL; | |
325 | ||
326 | control_node = of_parse_phandle(node, "ctrl-module", 0); | |
327 | if (!control_node) { | |
328 | dev_err(&pdev->dev, | |
329 | "Failed to get control device phandle\n"); | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | control_pdev = of_find_device_by_node(control_node); | |
334 | if (!control_pdev) { | |
335 | dev_err(&pdev->dev, "Failed to get control device\n"); | |
336 | return -EINVAL; | |
337 | } | |
338 | phy->control_dev = &control_pdev->dev; | |
339 | } else { | |
340 | if (of_property_read_u32_index(node, | |
341 | "syscon-phy-power", 1, | |
342 | &phy->power_reg)) { | |
343 | dev_err(&pdev->dev, | |
344 | "couldn't get power reg. offset\n"); | |
345 | return -EINVAL; | |
346 | } | |
657b306a KVA |
347 | } |
348 | ||
657b306a KVA |
349 | otg->set_host = omap_usb_set_host; |
350 | otg->set_peripheral = omap_usb_set_peripheral; | |
09a0168d GC |
351 | if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS) |
352 | otg->set_vbus = omap_usb_set_vbus; | |
353 | if (phy_data->flags & OMAP_USB2_HAS_START_SRP) | |
354 | otg->start_srp = omap_usb_start_srp; | |
19c1eac2 | 355 | otg->usb_phy = &phy->phy; |
657b306a | 356 | |
5d93d1e7 | 357 | platform_set_drvdata(pdev, phy); |
f20531a9 | 358 | pm_runtime_enable(phy->dev); |
5d93d1e7 | 359 | |
dbc98635 | 360 | generic_phy = devm_phy_create(phy->dev, NULL, &ops); |
f20531a9 OG |
361 | if (IS_ERR(generic_phy)) { |
362 | pm_runtime_disable(phy->dev); | |
5d93d1e7 | 363 | return PTR_ERR(generic_phy); |
f20531a9 | 364 | } |
5d93d1e7 KVA |
365 | |
366 | phy_set_drvdata(generic_phy, phy); | |
86c574e4 | 367 | omap_usb_power_off(generic_phy); |
5d93d1e7 | 368 | |
64fe1891 KVA |
369 | phy_provider = devm_of_phy_provider_register(phy->dev, |
370 | of_phy_simple_xlate); | |
eb82a3d8 RQ |
371 | if (IS_ERR(phy_provider)) { |
372 | pm_runtime_disable(phy->dev); | |
64fe1891 | 373 | return PTR_ERR(phy_provider); |
eb82a3d8 | 374 | } |
64fe1891 | 375 | |
9f1d8ed2 | 376 | phy->wkupclk = devm_clk_get(phy->dev, "wkupclk"); |
657b306a | 377 | if (IS_ERR(phy->wkupclk)) { |
9f1d8ed2 RQ |
378 | dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n"); |
379 | phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); | |
380 | if (IS_ERR(phy->wkupclk)) { | |
381 | dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); | |
4581f798 | 382 | pm_runtime_disable(phy->dev); |
9f1d8ed2 RQ |
383 | return PTR_ERR(phy->wkupclk); |
384 | } else { | |
385 | dev_warn(&pdev->dev, | |
386 | "found usb_phy_cm_clk32k, please fix DTS\n"); | |
387 | } | |
657b306a KVA |
388 | } |
389 | clk_prepare(phy->wkupclk); | |
390 | ||
9f1d8ed2 RQ |
391 | phy->optclk = devm_clk_get(phy->dev, "refclk"); |
392 | if (IS_ERR(phy->optclk)) { | |
393 | dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n"); | |
394 | phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m"); | |
395 | if (IS_ERR(phy->optclk)) { | |
396 | dev_dbg(&pdev->dev, | |
397 | "unable to get usb_otg_ss_refclk960m\n"); | |
398 | } else { | |
399 | dev_warn(&pdev->dev, | |
400 | "found usb_otg_ss_refclk960m, please fix DTS\n"); | |
401 | } | |
9f1d8ed2 | 402 | } |
0c4c8bbb | 403 | |
b1ff3231 AL |
404 | if (!IS_ERR(phy->optclk)) |
405 | clk_prepare(phy->optclk); | |
406 | ||
c11747f6 | 407 | usb_add_phy_dev(&phy->phy); |
657b306a | 408 | |
657b306a KVA |
409 | return 0; |
410 | } | |
411 | ||
fb4e98ab | 412 | static int omap_usb2_remove(struct platform_device *pdev) |
657b306a KVA |
413 | { |
414 | struct omap_usb *phy = platform_get_drvdata(pdev); | |
415 | ||
416 | clk_unprepare(phy->wkupclk); | |
0c4c8bbb KVA |
417 | if (!IS_ERR(phy->optclk)) |
418 | clk_unprepare(phy->optclk); | |
657b306a | 419 | usb_remove_phy(&phy->phy); |
eb82a3d8 | 420 | pm_runtime_disable(phy->dev); |
657b306a KVA |
421 | |
422 | return 0; | |
423 | } | |
424 | ||
657b306a KVA |
425 | static struct platform_driver omap_usb2_driver = { |
426 | .probe = omap_usb2_probe, | |
7690417d | 427 | .remove = omap_usb2_remove, |
657b306a KVA |
428 | .driver = { |
429 | .name = "omap-usb2", | |
52a4a72a | 430 | .of_match_table = omap_usb2_id_table, |
657b306a KVA |
431 | }, |
432 | }; | |
433 | ||
434 | module_platform_driver(omap_usb2_driver); | |
435 | ||
dd64ad38 | 436 | MODULE_ALIAS("platform:omap_usb2"); |
657b306a KVA |
437 | MODULE_AUTHOR("Texas Instruments Inc."); |
438 | MODULE_DESCRIPTION("OMAP USB2 phy driver"); | |
439 | MODULE_LICENSE("GPL v2"); |