mm, vmalloc: remove useless variable in vmap_block
[linux/fpc-iii.git] / drivers / usb / phy / phy-generic.c
blobefe59f3f7fdae946f1d6b5c76b9e6f21a0143be1
1 /*
2 * drivers/usb/otg/nop-usb-xceiv.c
4 * NOP USB transceiver for all USB transceiver which are either built-in
5 * into USB IP or which are mostly autonomous.
7 * Copyright (C) 2009 Texas Instruments Inc
8 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
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.
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.
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.
24 * Current status:
25 * This provides a "nop" transceiver for PHYs which are
26 * autonomous such as isp1504, isp1707, etc.
29 #include <linux/module.h>
30 #include <linux/platform_device.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/usb/otg.h>
33 #include <linux/usb/usb_phy_gen_xceiv.h>
34 #include <linux/slab.h>
35 #include <linux/clk.h>
36 #include <linux/regulator/consumer.h>
37 #include <linux/of.h>
39 #include "phy-generic.h"
41 static struct platform_device *pd;
43 void usb_nop_xceiv_register(void)
45 if (pd)
46 return;
47 pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
48 if (!pd) {
49 pr_err("Unable to register generic usb transceiver\n");
50 return;
53 EXPORT_SYMBOL(usb_nop_xceiv_register);
55 void usb_nop_xceiv_unregister(void)
57 platform_device_unregister(pd);
58 pd = NULL;
60 EXPORT_SYMBOL(usb_nop_xceiv_unregister);
62 static int nop_set_suspend(struct usb_phy *x, int suspend)
64 return 0;
67 int usb_gen_phy_init(struct usb_phy *phy)
69 struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
71 if (!IS_ERR(nop->vcc)) {
72 if (regulator_enable(nop->vcc))
73 dev_err(phy->dev, "Failed to enable power\n");
76 if (!IS_ERR(nop->clk))
77 clk_enable(nop->clk);
79 if (!IS_ERR(nop->reset)) {
80 /* De-assert RESET */
81 if (regulator_enable(nop->reset))
82 dev_err(phy->dev, "Failed to de-assert reset\n");
85 return 0;
87 EXPORT_SYMBOL_GPL(usb_gen_phy_init);
89 void usb_gen_phy_shutdown(struct usb_phy *phy)
91 struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
93 if (!IS_ERR(nop->reset)) {
94 /* Assert RESET */
95 if (regulator_disable(nop->reset))
96 dev_err(phy->dev, "Failed to assert reset\n");
99 if (!IS_ERR(nop->clk))
100 clk_disable(nop->clk);
102 if (!IS_ERR(nop->vcc)) {
103 if (regulator_disable(nop->vcc))
104 dev_err(phy->dev, "Failed to disable power\n");
107 EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
109 static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
111 if (!otg)
112 return -ENODEV;
114 if (!gadget) {
115 otg->gadget = NULL;
116 return -ENODEV;
119 otg->gadget = gadget;
120 otg->phy->state = OTG_STATE_B_IDLE;
121 return 0;
124 static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
126 if (!otg)
127 return -ENODEV;
129 if (!host) {
130 otg->host = NULL;
131 return -ENODEV;
134 otg->host = host;
135 return 0;
138 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
139 enum usb_phy_type type, u32 clk_rate, bool needs_vcc,
140 bool needs_reset)
142 int err;
144 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
145 GFP_KERNEL);
146 if (!nop->phy.otg)
147 return -ENOMEM;
149 nop->clk = devm_clk_get(dev, "main_clk");
150 if (IS_ERR(nop->clk)) {
151 dev_dbg(dev, "Can't get phy clock: %ld\n",
152 PTR_ERR(nop->clk));
155 if (!IS_ERR(nop->clk) && clk_rate) {
156 err = clk_set_rate(nop->clk, clk_rate);
157 if (err) {
158 dev_err(dev, "Error setting clock rate\n");
159 return err;
163 if (!IS_ERR(nop->clk)) {
164 err = clk_prepare(nop->clk);
165 if (err) {
166 dev_err(dev, "Error preparing clock\n");
167 return err;
171 nop->vcc = devm_regulator_get(dev, "vcc");
172 if (IS_ERR(nop->vcc)) {
173 dev_dbg(dev, "Error getting vcc regulator: %ld\n",
174 PTR_ERR(nop->vcc));
175 if (needs_vcc)
176 return -EPROBE_DEFER;
179 nop->reset = devm_regulator_get(dev, "reset");
180 if (IS_ERR(nop->reset)) {
181 dev_dbg(dev, "Error getting reset regulator: %ld\n",
182 PTR_ERR(nop->reset));
183 if (needs_reset)
184 return -EPROBE_DEFER;
187 nop->dev = dev;
188 nop->phy.dev = nop->dev;
189 nop->phy.label = "nop-xceiv";
190 nop->phy.set_suspend = nop_set_suspend;
191 nop->phy.state = OTG_STATE_UNDEFINED;
192 nop->phy.type = type;
194 nop->phy.otg->phy = &nop->phy;
195 nop->phy.otg->set_host = nop_set_host;
196 nop->phy.otg->set_peripheral = nop_set_peripheral;
198 ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
199 return 0;
201 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
203 void usb_phy_gen_cleanup_phy(struct usb_phy_gen_xceiv *nop)
205 if (!IS_ERR(nop->clk))
206 clk_unprepare(nop->clk);
208 EXPORT_SYMBOL_GPL(usb_phy_gen_cleanup_phy);
210 static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
212 struct device *dev = &pdev->dev;
213 struct usb_phy_gen_xceiv_platform_data *pdata =
214 dev_get_platdata(&pdev->dev);
215 struct usb_phy_gen_xceiv *nop;
216 enum usb_phy_type type = USB_PHY_TYPE_USB2;
217 int err;
218 u32 clk_rate = 0;
219 bool needs_vcc = false;
220 bool needs_reset = false;
222 if (dev->of_node) {
223 struct device_node *node = dev->of_node;
225 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
226 clk_rate = 0;
228 needs_vcc = of_property_read_bool(node, "vcc-supply");
229 needs_reset = of_property_read_bool(node, "reset-supply");
231 } else if (pdata) {
232 type = pdata->type;
233 clk_rate = pdata->clk_rate;
234 needs_vcc = pdata->needs_vcc;
235 needs_reset = pdata->needs_reset;
238 nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
239 if (!nop)
240 return -ENOMEM;
243 err = usb_phy_gen_create_phy(dev, nop, type, clk_rate, needs_vcc,
244 needs_reset);
245 if (err)
246 return err;
248 nop->phy.init = usb_gen_phy_init;
249 nop->phy.shutdown = usb_gen_phy_shutdown;
251 err = usb_add_phy_dev(&nop->phy);
252 if (err) {
253 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
254 err);
255 goto err_add;
258 platform_set_drvdata(pdev, nop);
260 return 0;
262 err_add:
263 usb_phy_gen_cleanup_phy(nop);
264 return err;
267 static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
269 struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);
271 usb_phy_gen_cleanup_phy(nop);
272 usb_remove_phy(&nop->phy);
274 return 0;
277 static const struct of_device_id nop_xceiv_dt_ids[] = {
278 { .compatible = "usb-nop-xceiv" },
282 MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
284 static struct platform_driver usb_phy_gen_xceiv_driver = {
285 .probe = usb_phy_gen_xceiv_probe,
286 .remove = usb_phy_gen_xceiv_remove,
287 .driver = {
288 .name = "usb_phy_gen_xceiv",
289 .owner = THIS_MODULE,
290 .of_match_table = nop_xceiv_dt_ids,
294 static int __init usb_phy_gen_xceiv_init(void)
296 return platform_driver_register(&usb_phy_gen_xceiv_driver);
298 subsys_initcall(usb_phy_gen_xceiv_init);
300 static void __exit usb_phy_gen_xceiv_exit(void)
302 platform_driver_unregister(&usb_phy_gen_xceiv_driver);
304 module_exit(usb_phy_gen_xceiv_exit);
306 MODULE_ALIAS("platform:usb_phy_gen_xceiv");
307 MODULE_AUTHOR("Texas Instruments Inc");
308 MODULE_DESCRIPTION("NOP USB Transceiver driver");
309 MODULE_LICENSE("GPL");