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.
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>
39 #include "phy-generic.h"
41 static struct platform_device
*pd
;
43 void usb_nop_xceiv_register(void)
47 pd
= platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL
, 0);
49 pr_err("Unable to register generic usb transceiver\n");
53 EXPORT_SYMBOL(usb_nop_xceiv_register
);
55 void usb_nop_xceiv_unregister(void)
57 platform_device_unregister(pd
);
60 EXPORT_SYMBOL(usb_nop_xceiv_unregister
);
62 static int nop_set_suspend(struct usb_phy
*x
, int suspend
)
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
))
79 if (!IS_ERR(nop
->reset
)) {
81 if (regulator_enable(nop
->reset
))
82 dev_err(phy
->dev
, "Failed to de-assert reset\n");
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
)) {
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
)
119 otg
->gadget
= gadget
;
120 otg
->phy
->state
= OTG_STATE_B_IDLE
;
124 static int nop_set_host(struct usb_otg
*otg
, struct usb_bus
*host
)
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
,
144 nop
->phy
.otg
= devm_kzalloc(dev
, sizeof(*nop
->phy
.otg
),
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",
155 if (!IS_ERR(nop
->clk
) && clk_rate
) {
156 err
= clk_set_rate(nop
->clk
, clk_rate
);
158 dev_err(dev
, "Error setting clock rate\n");
163 if (!IS_ERR(nop
->clk
)) {
164 err
= clk_prepare(nop
->clk
);
166 dev_err(dev
, "Error preparing clock\n");
171 nop
->vcc
= devm_regulator_get(dev
, "vcc");
172 if (IS_ERR(nop
->vcc
)) {
173 dev_dbg(dev
, "Error getting vcc regulator: %ld\n",
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
));
184 return -EPROBE_DEFER
;
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
);
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
;
219 bool needs_vcc
= false;
220 bool needs_reset
= false;
223 struct device_node
*node
= dev
->of_node
;
225 if (of_property_read_u32(node
, "clock-frequency", &clk_rate
))
228 needs_vcc
= of_property_read_bool(node
, "vcc-supply");
229 needs_reset
= of_property_read_bool(node
, "reset-supply");
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
);
243 err
= usb_phy_gen_create_phy(dev
, nop
, type
, clk_rate
, needs_vcc
,
248 nop
->phy
.init
= usb_gen_phy_init
;
249 nop
->phy
.shutdown
= usb_gen_phy_shutdown
;
251 err
= usb_add_phy_dev(&nop
->phy
);
253 dev_err(&pdev
->dev
, "can't register transceiver, err: %d\n",
258 platform_set_drvdata(pdev
, nop
);
263 usb_phy_gen_cleanup_phy(nop
);
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
);
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
,
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");