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f6d92a05 AKG |
1 | /* |
2 | * drivers/usb/otg/nop-usb-xceiv.c | |
3 | * | |
4 | * NOP USB transceiver for all USB transceiver which are either built-in | |
5 | * into USB IP or which are mostly autonomous. | |
6 | * | |
7 | * Copyright (C) 2009 Texas Instruments Inc | |
8 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | * | |
24 | * Current status: | |
cc835e32 DB |
25 | * This provides a "nop" transceiver for PHYs which are |
26 | * autonomous such as isp1504, isp1707, etc. | |
f6d92a05 AKG |
27 | */ |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/dma-mapping.h> | |
32 | #include <linux/usb/otg.h> | |
d7078df6 | 33 | #include <linux/usb/usb_phy_generic.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
2319fb88 | 35 | #include <linux/clk.h> |
58f735fe | 36 | #include <linux/regulator/consumer.h> |
0eba3879 | 37 | #include <linux/of.h> |
bd27fa44 RQ |
38 | #include <linux/of_gpio.h> |
39 | #include <linux/gpio.h> | |
40 | #include <linux/delay.h> | |
f6d92a05 | 41 | |
53b6fc28 | 42 | #include "phy-generic.h" |
f6d92a05 | 43 | |
2f36ff69 | 44 | struct platform_device *usb_phy_generic_register(void) |
f6d92a05 | 45 | { |
2f36ff69 FB |
46 | return platform_device_register_simple("usb_phy_generic", |
47 | PLATFORM_DEVID_AUTO, NULL, 0); | |
f6d92a05 | 48 | } |
4525beeb | 49 | EXPORT_SYMBOL_GPL(usb_phy_generic_register); |
f6d92a05 | 50 | |
2f36ff69 | 51 | void usb_phy_generic_unregister(struct platform_device *pdev) |
f6d92a05 | 52 | { |
2f36ff69 | 53 | platform_device_unregister(pdev); |
f6d92a05 | 54 | } |
4525beeb | 55 | EXPORT_SYMBOL_GPL(usb_phy_generic_unregister); |
f6d92a05 | 56 | |
86753811 | 57 | static int nop_set_suspend(struct usb_phy *x, int suspend) |
f6d92a05 AKG |
58 | { |
59 | return 0; | |
60 | } | |
61 | ||
4525beeb | 62 | static void nop_reset_set(struct usb_phy_generic *nop, int asserted) |
bd27fa44 RQ |
63 | { |
64 | int value; | |
65 | ||
66 | if (!gpio_is_valid(nop->gpio_reset)) | |
67 | return; | |
68 | ||
69 | value = asserted; | |
70 | if (nop->reset_active_low) | |
71 | value = !value; | |
72 | ||
73 | gpio_set_value_cansleep(nop->gpio_reset, value); | |
74 | ||
75 | if (!asserted) | |
76 | usleep_range(10000, 20000); | |
77 | } | |
78 | ||
53b6fc28 | 79 | int usb_gen_phy_init(struct usb_phy *phy) |
2319fb88 | 80 | { |
4525beeb | 81 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 82 | |
58f735fe RQ |
83 | if (!IS_ERR(nop->vcc)) { |
84 | if (regulator_enable(nop->vcc)) | |
85 | dev_err(phy->dev, "Failed to enable power\n"); | |
86 | } | |
87 | ||
2319fb88 | 88 | if (!IS_ERR(nop->clk)) |
4d175f34 | 89 | clk_prepare_enable(nop->clk); |
2319fb88 | 90 | |
bd27fa44 RQ |
91 | /* De-assert RESET */ |
92 | nop_reset_set(nop, 0); | |
ad63ebfc | 93 | |
2319fb88 RQ |
94 | return 0; |
95 | } | |
53b6fc28 | 96 | EXPORT_SYMBOL_GPL(usb_gen_phy_init); |
2319fb88 | 97 | |
53b6fc28 | 98 | void usb_gen_phy_shutdown(struct usb_phy *phy) |
2319fb88 | 99 | { |
4525beeb | 100 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 101 | |
bd27fa44 RQ |
102 | /* Assert RESET */ |
103 | nop_reset_set(nop, 1); | |
ad63ebfc | 104 | |
2319fb88 | 105 | if (!IS_ERR(nop->clk)) |
4d175f34 | 106 | clk_disable_unprepare(nop->clk); |
58f735fe RQ |
107 | |
108 | if (!IS_ERR(nop->vcc)) { | |
109 | if (regulator_disable(nop->vcc)) | |
110 | dev_err(phy->dev, "Failed to disable power\n"); | |
111 | } | |
2319fb88 | 112 | } |
53b6fc28 | 113 | EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown); |
2319fb88 | 114 | |
41adf109 | 115 | static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) |
f6d92a05 | 116 | { |
41adf109 | 117 | if (!otg) |
f6d92a05 AKG |
118 | return -ENODEV; |
119 | ||
f6d92a05 | 120 | if (!gadget) { |
41adf109 | 121 | otg->gadget = NULL; |
f6d92a05 AKG |
122 | return -ENODEV; |
123 | } | |
124 | ||
41adf109 | 125 | otg->gadget = gadget; |
e47d9254 | 126 | otg->state = OTG_STATE_B_IDLE; |
f6d92a05 AKG |
127 | return 0; |
128 | } | |
129 | ||
41adf109 | 130 | static int nop_set_host(struct usb_otg *otg, struct usb_bus *host) |
f6d92a05 | 131 | { |
41adf109 | 132 | if (!otg) |
f6d92a05 AKG |
133 | return -ENODEV; |
134 | ||
f6d92a05 | 135 | if (!host) { |
41adf109 | 136 | otg->host = NULL; |
f6d92a05 AKG |
137 | return -ENODEV; |
138 | } | |
139 | ||
41adf109 | 140 | otg->host = host; |
f6d92a05 AKG |
141 | return 0; |
142 | } | |
143 | ||
4525beeb FB |
144 | int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop, |
145 | struct usb_phy_generic_platform_data *pdata) | |
f6d92a05 | 146 | { |
af9f51c5 | 147 | enum usb_phy_type type = USB_PHY_TYPE_USB2; |
f6d92a05 AKG |
148 | int err; |
149 | ||
af9f51c5 FB |
150 | u32 clk_rate = 0; |
151 | bool needs_vcc = false; | |
152 | ||
153 | nop->reset_active_low = true; /* default behaviour */ | |
154 | ||
155 | if (dev->of_node) { | |
156 | struct device_node *node = dev->of_node; | |
37cfbc42 | 157 | enum of_gpio_flags flags = 0; |
af9f51c5 FB |
158 | |
159 | if (of_property_read_u32(node, "clock-frequency", &clk_rate)) | |
160 | clk_rate = 0; | |
161 | ||
162 | needs_vcc = of_property_read_bool(node, "vcc-supply"); | |
163 | nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios", | |
164 | 0, &flags); | |
165 | if (nop->gpio_reset == -EPROBE_DEFER) | |
166 | return -EPROBE_DEFER; | |
167 | ||
168 | nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW; | |
169 | ||
170 | } else if (pdata) { | |
171 | type = pdata->type; | |
172 | clk_rate = pdata->clk_rate; | |
173 | needs_vcc = pdata->needs_vcc; | |
174 | nop->gpio_reset = pdata->gpio_reset; | |
dc52c574 AK |
175 | } else { |
176 | nop->gpio_reset = -1; | |
af9f51c5 FB |
177 | } |
178 | ||
53b6fc28 SAS |
179 | nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg), |
180 | GFP_KERNEL); | |
e4d7dc66 | 181 | if (!nop->phy.otg) |
41adf109 | 182 | return -ENOMEM; |
41adf109 | 183 | |
53b6fc28 | 184 | nop->clk = devm_clk_get(dev, "main_clk"); |
2319fb88 | 185 | if (IS_ERR(nop->clk)) { |
53b6fc28 | 186 | dev_dbg(dev, "Can't get phy clock: %ld\n", |
2319fb88 RQ |
187 | PTR_ERR(nop->clk)); |
188 | } | |
189 | ||
0eba3879 RQ |
190 | if (!IS_ERR(nop->clk) && clk_rate) { |
191 | err = clk_set_rate(nop->clk, clk_rate); | |
2319fb88 | 192 | if (err) { |
53b6fc28 | 193 | dev_err(dev, "Error setting clock rate\n"); |
2319fb88 RQ |
194 | return err; |
195 | } | |
196 | } | |
197 | ||
53b6fc28 | 198 | nop->vcc = devm_regulator_get(dev, "vcc"); |
58f735fe | 199 | if (IS_ERR(nop->vcc)) { |
53b6fc28 | 200 | dev_dbg(dev, "Error getting vcc regulator: %ld\n", |
58f735fe | 201 | PTR_ERR(nop->vcc)); |
b54b5f56 RQ |
202 | if (needs_vcc) |
203 | return -EPROBE_DEFER; | |
58f735fe RQ |
204 | } |
205 | ||
bd27fa44 RQ |
206 | if (gpio_is_valid(nop->gpio_reset)) { |
207 | unsigned long gpio_flags; | |
208 | ||
209 | /* Assert RESET */ | |
210 | if (nop->reset_active_low) | |
211 | gpio_flags = GPIOF_OUT_INIT_LOW; | |
212 | else | |
213 | gpio_flags = GPIOF_OUT_INIT_HIGH; | |
214 | ||
215 | err = devm_gpio_request_one(dev, nop->gpio_reset, | |
216 | gpio_flags, dev_name(dev)); | |
217 | if (err) { | |
218 | dev_err(dev, "Error requesting RESET GPIO %d\n", | |
219 | nop->gpio_reset); | |
220 | return err; | |
221 | } | |
ad63ebfc RQ |
222 | } |
223 | ||
53b6fc28 | 224 | nop->dev = dev; |
41adf109 HK |
225 | nop->phy.dev = nop->dev; |
226 | nop->phy.label = "nop-xceiv"; | |
227 | nop->phy.set_suspend = nop_set_suspend; | |
90f4232f | 228 | nop->phy.type = type; |
41adf109 | 229 | |
e47d9254 | 230 | nop->phy.otg->state = OTG_STATE_UNDEFINED; |
41adf109 HK |
231 | nop->phy.otg->phy = &nop->phy; |
232 | nop->phy.otg->set_host = nop_set_host; | |
233 | nop->phy.otg->set_peripheral = nop_set_peripheral; | |
234 | ||
53b6fc28 SAS |
235 | return 0; |
236 | } | |
237 | EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy); | |
238 | ||
4525beeb | 239 | static int usb_phy_generic_probe(struct platform_device *pdev) |
53b6fc28 SAS |
240 | { |
241 | struct device *dev = &pdev->dev; | |
4525beeb | 242 | struct usb_phy_generic *nop; |
53b6fc28 | 243 | int err; |
bd27fa44 RQ |
244 | |
245 | nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL); | |
246 | if (!nop) | |
247 | return -ENOMEM; | |
248 | ||
af9f51c5 | 249 | err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev)); |
53b6fc28 SAS |
250 | if (err) |
251 | return err; | |
252 | ||
253 | nop->phy.init = usb_gen_phy_init; | |
254 | nop->phy.shutdown = usb_gen_phy_shutdown; | |
255 | ||
90f4232f | 256 | err = usb_add_phy_dev(&nop->phy); |
f6d92a05 AKG |
257 | if (err) { |
258 | dev_err(&pdev->dev, "can't register transceiver, err: %d\n", | |
259 | err); | |
4d175f34 | 260 | return err; |
f6d92a05 AKG |
261 | } |
262 | ||
263 | platform_set_drvdata(pdev, nop); | |
264 | ||
265 | return 0; | |
f6d92a05 AKG |
266 | } |
267 | ||
4525beeb | 268 | static int usb_phy_generic_remove(struct platform_device *pdev) |
f6d92a05 | 269 | { |
4525beeb | 270 | struct usb_phy_generic *nop = platform_get_drvdata(pdev); |
f6d92a05 | 271 | |
662dca54 | 272 | usb_remove_phy(&nop->phy); |
f6d92a05 | 273 | |
f6d92a05 AKG |
274 | return 0; |
275 | } | |
276 | ||
0eba3879 RQ |
277 | static const struct of_device_id nop_xceiv_dt_ids[] = { |
278 | { .compatible = "usb-nop-xceiv" }, | |
279 | { } | |
280 | }; | |
281 | ||
282 | MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids); | |
283 | ||
4525beeb FB |
284 | static struct platform_driver usb_phy_generic_driver = { |
285 | .probe = usb_phy_generic_probe, | |
286 | .remove = usb_phy_generic_remove, | |
f6d92a05 | 287 | .driver = { |
4525beeb | 288 | .name = "usb_phy_generic", |
f6d92a05 | 289 | .owner = THIS_MODULE, |
5462b0db | 290 | .of_match_table = nop_xceiv_dt_ids, |
f6d92a05 AKG |
291 | }, |
292 | }; | |
293 | ||
4525beeb | 294 | static int __init usb_phy_generic_init(void) |
f6d92a05 | 295 | { |
4525beeb | 296 | return platform_driver_register(&usb_phy_generic_driver); |
f6d92a05 | 297 | } |
4525beeb | 298 | subsys_initcall(usb_phy_generic_init); |
f6d92a05 | 299 | |
4525beeb | 300 | static void __exit usb_phy_generic_exit(void) |
f6d92a05 | 301 | { |
4525beeb | 302 | platform_driver_unregister(&usb_phy_generic_driver); |
f6d92a05 | 303 | } |
4525beeb | 304 | module_exit(usb_phy_generic_exit); |
f6d92a05 | 305 | |
4525beeb | 306 | MODULE_ALIAS("platform:usb_phy_generic"); |
f6d92a05 AKG |
307 | MODULE_AUTHOR("Texas Instruments Inc"); |
308 | MODULE_DESCRIPTION("NOP USB Transceiver driver"); | |
309 | MODULE_LICENSE("GPL"); |