Commit | Line | Data |
---|---|---|
f6d92a05 | 1 | /* |
f6d92a05 AKG |
2 | * NOP USB transceiver for all USB transceiver which are either built-in |
3 | * into USB IP or which are mostly autonomous. | |
4 | * | |
5 | * Copyright (C) 2009 Texas Instruments Inc | |
6 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | * Current status: | |
cc835e32 DB |
23 | * This provides a "nop" transceiver for PHYs which are |
24 | * autonomous such as isp1504, isp1707, etc. | |
f6d92a05 AKG |
25 | */ |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/dma-mapping.h> | |
30 | #include <linux/usb/otg.h> | |
d7078df6 | 31 | #include <linux/usb/usb_phy_generic.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
2319fb88 | 33 | #include <linux/clk.h> |
58f735fe | 34 | #include <linux/regulator/consumer.h> |
0eba3879 | 35 | #include <linux/of.h> |
bd27fa44 RQ |
36 | #include <linux/of_gpio.h> |
37 | #include <linux/gpio.h> | |
38 | #include <linux/delay.h> | |
f6d92a05 | 39 | |
53b6fc28 | 40 | #include "phy-generic.h" |
f6d92a05 | 41 | |
2f36ff69 | 42 | struct platform_device *usb_phy_generic_register(void) |
f6d92a05 | 43 | { |
2f36ff69 FB |
44 | return platform_device_register_simple("usb_phy_generic", |
45 | PLATFORM_DEVID_AUTO, NULL, 0); | |
f6d92a05 | 46 | } |
4525beeb | 47 | EXPORT_SYMBOL_GPL(usb_phy_generic_register); |
f6d92a05 | 48 | |
2f36ff69 | 49 | void usb_phy_generic_unregister(struct platform_device *pdev) |
f6d92a05 | 50 | { |
2f36ff69 | 51 | platform_device_unregister(pdev); |
f6d92a05 | 52 | } |
4525beeb | 53 | EXPORT_SYMBOL_GPL(usb_phy_generic_unregister); |
f6d92a05 | 54 | |
86753811 | 55 | static int nop_set_suspend(struct usb_phy *x, int suspend) |
f6d92a05 AKG |
56 | { |
57 | return 0; | |
58 | } | |
59 | ||
4525beeb | 60 | static void nop_reset_set(struct usb_phy_generic *nop, int asserted) |
bd27fa44 RQ |
61 | { |
62 | int value; | |
63 | ||
64 | if (!gpio_is_valid(nop->gpio_reset)) | |
65 | return; | |
66 | ||
67 | value = asserted; | |
68 | if (nop->reset_active_low) | |
69 | value = !value; | |
70 | ||
71 | gpio_set_value_cansleep(nop->gpio_reset, value); | |
72 | ||
73 | if (!asserted) | |
74 | usleep_range(10000, 20000); | |
75 | } | |
76 | ||
53b6fc28 | 77 | int usb_gen_phy_init(struct usb_phy *phy) |
2319fb88 | 78 | { |
4525beeb | 79 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 80 | |
58f735fe RQ |
81 | if (!IS_ERR(nop->vcc)) { |
82 | if (regulator_enable(nop->vcc)) | |
83 | dev_err(phy->dev, "Failed to enable power\n"); | |
84 | } | |
85 | ||
2319fb88 | 86 | if (!IS_ERR(nop->clk)) |
4d175f34 | 87 | clk_prepare_enable(nop->clk); |
2319fb88 | 88 | |
bd27fa44 RQ |
89 | /* De-assert RESET */ |
90 | nop_reset_set(nop, 0); | |
ad63ebfc | 91 | |
2319fb88 RQ |
92 | return 0; |
93 | } | |
53b6fc28 | 94 | EXPORT_SYMBOL_GPL(usb_gen_phy_init); |
2319fb88 | 95 | |
53b6fc28 | 96 | void usb_gen_phy_shutdown(struct usb_phy *phy) |
2319fb88 | 97 | { |
4525beeb | 98 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 99 | |
bd27fa44 RQ |
100 | /* Assert RESET */ |
101 | nop_reset_set(nop, 1); | |
ad63ebfc | 102 | |
2319fb88 | 103 | if (!IS_ERR(nop->clk)) |
4d175f34 | 104 | clk_disable_unprepare(nop->clk); |
58f735fe RQ |
105 | |
106 | if (!IS_ERR(nop->vcc)) { | |
107 | if (regulator_disable(nop->vcc)) | |
108 | dev_err(phy->dev, "Failed to disable power\n"); | |
109 | } | |
2319fb88 | 110 | } |
53b6fc28 | 111 | EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown); |
2319fb88 | 112 | |
41adf109 | 113 | static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) |
f6d92a05 | 114 | { |
41adf109 | 115 | if (!otg) |
f6d92a05 AKG |
116 | return -ENODEV; |
117 | ||
f6d92a05 | 118 | if (!gadget) { |
41adf109 | 119 | otg->gadget = NULL; |
f6d92a05 AKG |
120 | return -ENODEV; |
121 | } | |
122 | ||
41adf109 | 123 | otg->gadget = gadget; |
e47d9254 | 124 | otg->state = OTG_STATE_B_IDLE; |
f6d92a05 AKG |
125 | return 0; |
126 | } | |
127 | ||
41adf109 | 128 | static int nop_set_host(struct usb_otg *otg, struct usb_bus *host) |
f6d92a05 | 129 | { |
41adf109 | 130 | if (!otg) |
f6d92a05 AKG |
131 | return -ENODEV; |
132 | ||
f6d92a05 | 133 | if (!host) { |
41adf109 | 134 | otg->host = NULL; |
f6d92a05 AKG |
135 | return -ENODEV; |
136 | } | |
137 | ||
41adf109 | 138 | otg->host = host; |
f6d92a05 AKG |
139 | return 0; |
140 | } | |
141 | ||
4525beeb FB |
142 | int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop, |
143 | struct usb_phy_generic_platform_data *pdata) | |
f6d92a05 | 144 | { |
af9f51c5 | 145 | enum usb_phy_type type = USB_PHY_TYPE_USB2; |
f6d92a05 AKG |
146 | int err; |
147 | ||
af9f51c5 FB |
148 | u32 clk_rate = 0; |
149 | bool needs_vcc = false; | |
150 | ||
151 | nop->reset_active_low = true; /* default behaviour */ | |
152 | ||
153 | if (dev->of_node) { | |
154 | struct device_node *node = dev->of_node; | |
37cfbc42 | 155 | enum of_gpio_flags flags = 0; |
af9f51c5 FB |
156 | |
157 | if (of_property_read_u32(node, "clock-frequency", &clk_rate)) | |
158 | clk_rate = 0; | |
159 | ||
160 | needs_vcc = of_property_read_bool(node, "vcc-supply"); | |
161 | nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios", | |
162 | 0, &flags); | |
163 | if (nop->gpio_reset == -EPROBE_DEFER) | |
164 | return -EPROBE_DEFER; | |
165 | ||
166 | nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW; | |
167 | ||
168 | } else if (pdata) { | |
169 | type = pdata->type; | |
170 | clk_rate = pdata->clk_rate; | |
171 | needs_vcc = pdata->needs_vcc; | |
172 | nop->gpio_reset = pdata->gpio_reset; | |
dc52c574 AK |
173 | } else { |
174 | nop->gpio_reset = -1; | |
af9f51c5 FB |
175 | } |
176 | ||
53b6fc28 SAS |
177 | nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg), |
178 | GFP_KERNEL); | |
e4d7dc66 | 179 | if (!nop->phy.otg) |
41adf109 | 180 | return -ENOMEM; |
41adf109 | 181 | |
53b6fc28 | 182 | nop->clk = devm_clk_get(dev, "main_clk"); |
2319fb88 | 183 | if (IS_ERR(nop->clk)) { |
53b6fc28 | 184 | dev_dbg(dev, "Can't get phy clock: %ld\n", |
2319fb88 RQ |
185 | PTR_ERR(nop->clk)); |
186 | } | |
187 | ||
0eba3879 RQ |
188 | if (!IS_ERR(nop->clk) && clk_rate) { |
189 | err = clk_set_rate(nop->clk, clk_rate); | |
2319fb88 | 190 | if (err) { |
53b6fc28 | 191 | dev_err(dev, "Error setting clock rate\n"); |
2319fb88 RQ |
192 | return err; |
193 | } | |
194 | } | |
195 | ||
53b6fc28 | 196 | nop->vcc = devm_regulator_get(dev, "vcc"); |
58f735fe | 197 | if (IS_ERR(nop->vcc)) { |
53b6fc28 | 198 | dev_dbg(dev, "Error getting vcc regulator: %ld\n", |
58f735fe | 199 | PTR_ERR(nop->vcc)); |
b54b5f56 RQ |
200 | if (needs_vcc) |
201 | return -EPROBE_DEFER; | |
58f735fe RQ |
202 | } |
203 | ||
bd27fa44 RQ |
204 | if (gpio_is_valid(nop->gpio_reset)) { |
205 | unsigned long gpio_flags; | |
206 | ||
207 | /* Assert RESET */ | |
208 | if (nop->reset_active_low) | |
209 | gpio_flags = GPIOF_OUT_INIT_LOW; | |
210 | else | |
211 | gpio_flags = GPIOF_OUT_INIT_HIGH; | |
212 | ||
213 | err = devm_gpio_request_one(dev, nop->gpio_reset, | |
214 | gpio_flags, dev_name(dev)); | |
215 | if (err) { | |
216 | dev_err(dev, "Error requesting RESET GPIO %d\n", | |
217 | nop->gpio_reset); | |
218 | return err; | |
219 | } | |
ad63ebfc RQ |
220 | } |
221 | ||
53b6fc28 | 222 | nop->dev = dev; |
41adf109 HK |
223 | nop->phy.dev = nop->dev; |
224 | nop->phy.label = "nop-xceiv"; | |
225 | nop->phy.set_suspend = nop_set_suspend; | |
90f4232f | 226 | nop->phy.type = type; |
41adf109 | 227 | |
e47d9254 | 228 | nop->phy.otg->state = OTG_STATE_UNDEFINED; |
19c1eac2 | 229 | nop->phy.otg->usb_phy = &nop->phy; |
41adf109 HK |
230 | nop->phy.otg->set_host = nop_set_host; |
231 | nop->phy.otg->set_peripheral = nop_set_peripheral; | |
232 | ||
53b6fc28 SAS |
233 | return 0; |
234 | } | |
235 | EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy); | |
236 | ||
4525beeb | 237 | static int usb_phy_generic_probe(struct platform_device *pdev) |
53b6fc28 SAS |
238 | { |
239 | struct device *dev = &pdev->dev; | |
4525beeb | 240 | struct usb_phy_generic *nop; |
53b6fc28 | 241 | int err; |
bd27fa44 RQ |
242 | |
243 | nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL); | |
244 | if (!nop) | |
245 | return -ENOMEM; | |
246 | ||
af9f51c5 | 247 | err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev)); |
53b6fc28 SAS |
248 | if (err) |
249 | return err; | |
250 | ||
251 | nop->phy.init = usb_gen_phy_init; | |
252 | nop->phy.shutdown = usb_gen_phy_shutdown; | |
253 | ||
90f4232f | 254 | err = usb_add_phy_dev(&nop->phy); |
f6d92a05 AKG |
255 | if (err) { |
256 | dev_err(&pdev->dev, "can't register transceiver, err: %d\n", | |
257 | err); | |
4d175f34 | 258 | return err; |
f6d92a05 AKG |
259 | } |
260 | ||
261 | platform_set_drvdata(pdev, nop); | |
262 | ||
263 | return 0; | |
f6d92a05 AKG |
264 | } |
265 | ||
4525beeb | 266 | static int usb_phy_generic_remove(struct platform_device *pdev) |
f6d92a05 | 267 | { |
4525beeb | 268 | struct usb_phy_generic *nop = platform_get_drvdata(pdev); |
f6d92a05 | 269 | |
662dca54 | 270 | usb_remove_phy(&nop->phy); |
f6d92a05 | 271 | |
f6d92a05 AKG |
272 | return 0; |
273 | } | |
274 | ||
0eba3879 RQ |
275 | static const struct of_device_id nop_xceiv_dt_ids[] = { |
276 | { .compatible = "usb-nop-xceiv" }, | |
277 | { } | |
278 | }; | |
279 | ||
280 | MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids); | |
281 | ||
4525beeb FB |
282 | static struct platform_driver usb_phy_generic_driver = { |
283 | .probe = usb_phy_generic_probe, | |
284 | .remove = usb_phy_generic_remove, | |
f6d92a05 | 285 | .driver = { |
4525beeb | 286 | .name = "usb_phy_generic", |
5462b0db | 287 | .of_match_table = nop_xceiv_dt_ids, |
f6d92a05 AKG |
288 | }, |
289 | }; | |
290 | ||
4525beeb | 291 | static int __init usb_phy_generic_init(void) |
f6d92a05 | 292 | { |
4525beeb | 293 | return platform_driver_register(&usb_phy_generic_driver); |
f6d92a05 | 294 | } |
4525beeb | 295 | subsys_initcall(usb_phy_generic_init); |
f6d92a05 | 296 | |
4525beeb | 297 | static void __exit usb_phy_generic_exit(void) |
f6d92a05 | 298 | { |
4525beeb | 299 | platform_driver_unregister(&usb_phy_generic_driver); |
f6d92a05 | 300 | } |
4525beeb | 301 | module_exit(usb_phy_generic_exit); |
f6d92a05 | 302 | |
4525beeb | 303 | MODULE_ALIAS("platform:usb_phy_generic"); |
f6d92a05 AKG |
304 | MODULE_AUTHOR("Texas Instruments Inc"); |
305 | MODULE_DESCRIPTION("NOP USB Transceiver driver"); | |
306 | MODULE_LICENSE("GPL"); |