2 * NOP USB transceiver for all USB transceiver which are either built-in
3 * into USB IP or which are mostly autonomous.
5 * Copyright (C) 2009 Texas Instruments Inc
6 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
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.
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.
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.
23 * This provides a "nop" transceiver for PHYs which are
24 * autonomous such as isp1504, isp1707, etc.
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/usb/gadget.h>
31 #include <linux/usb/otg.h>
32 #include <linux/usb/usb_phy_generic.h>
33 #include <linux/slab.h>
34 #include <linux/clk.h>
35 #include <linux/regulator/consumer.h>
37 #include <linux/of_gpio.h>
38 #include <linux/gpio.h>
39 #include <linux/delay.h>
41 #include "phy-generic.h"
43 #define VBUS_IRQ_FLAGS \
44 (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
47 struct platform_device
*usb_phy_generic_register(void)
49 return platform_device_register_simple("usb_phy_generic",
50 PLATFORM_DEVID_AUTO
, NULL
, 0);
52 EXPORT_SYMBOL_GPL(usb_phy_generic_register
);
54 void usb_phy_generic_unregister(struct platform_device
*pdev
)
56 platform_device_unregister(pdev
);
58 EXPORT_SYMBOL_GPL(usb_phy_generic_unregister
);
60 static int nop_set_suspend(struct usb_phy
*x
, int suspend
)
65 static void nop_reset_set(struct usb_phy_generic
*nop
, int asserted
)
67 if (!nop
->gpiod_reset
)
70 gpiod_direction_output(nop
->gpiod_reset
, !asserted
);
71 usleep_range(10000, 20000);
72 gpiod_set_value(nop
->gpiod_reset
, asserted
);
75 /* interface to regulator framework */
76 static void nop_set_vbus_draw(struct usb_phy_generic
*nop
, unsigned mA
)
78 struct regulator
*vbus_draw
= nop
->vbus_draw
;
85 enabled
= nop
->vbus_draw_enabled
;
87 regulator_set_current_limit(vbus_draw
, 0, 1000 * mA
);
89 ret
= regulator_enable(vbus_draw
);
92 nop
->vbus_draw_enabled
= 1;
96 ret
= regulator_disable(vbus_draw
);
99 nop
->vbus_draw_enabled
= 0;
106 static irqreturn_t
nop_gpio_vbus_thread(int irq
, void *data
)
108 struct usb_phy_generic
*nop
= data
;
109 struct usb_otg
*otg
= nop
->phy
.otg
;
112 vbus
= gpiod_get_value(nop
->gpiod_vbus
);
113 if ((vbus
^ nop
->vbus
) == 0)
118 status
= USB_EVENT_VBUS
;
119 otg
->state
= OTG_STATE_B_PERIPHERAL
;
120 nop
->phy
.last_event
= status
;
121 usb_gadget_vbus_connect(otg
->gadget
);
123 /* drawing a "unit load" is *always* OK, except for OTG */
124 nop_set_vbus_draw(nop
, 100);
126 atomic_notifier_call_chain(&nop
->phy
.notifier
, status
,
129 nop_set_vbus_draw(nop
, 0);
131 usb_gadget_vbus_disconnect(otg
->gadget
);
132 status
= USB_EVENT_NONE
;
133 otg
->state
= OTG_STATE_B_IDLE
;
134 nop
->phy
.last_event
= status
;
136 atomic_notifier_call_chain(&nop
->phy
.notifier
, status
,
142 int usb_gen_phy_init(struct usb_phy
*phy
)
144 struct usb_phy_generic
*nop
= dev_get_drvdata(phy
->dev
);
146 if (!IS_ERR(nop
->vcc
)) {
147 if (regulator_enable(nop
->vcc
))
148 dev_err(phy
->dev
, "Failed to enable power\n");
151 if (!IS_ERR(nop
->clk
))
152 clk_prepare_enable(nop
->clk
);
154 /* De-assert RESET */
155 nop_reset_set(nop
, 0);
159 EXPORT_SYMBOL_GPL(usb_gen_phy_init
);
161 void usb_gen_phy_shutdown(struct usb_phy
*phy
)
163 struct usb_phy_generic
*nop
= dev_get_drvdata(phy
->dev
);
166 nop_reset_set(nop
, 1);
168 if (!IS_ERR(nop
->clk
))
169 clk_disable_unprepare(nop
->clk
);
171 if (!IS_ERR(nop
->vcc
)) {
172 if (regulator_disable(nop
->vcc
))
173 dev_err(phy
->dev
, "Failed to disable power\n");
176 EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown
);
178 static int nop_set_peripheral(struct usb_otg
*otg
, struct usb_gadget
*gadget
)
188 otg
->gadget
= gadget
;
189 otg
->state
= OTG_STATE_B_IDLE
;
193 static int nop_set_host(struct usb_otg
*otg
, struct usb_bus
*host
)
207 int usb_phy_gen_create_phy(struct device
*dev
, struct usb_phy_generic
*nop
,
208 struct usb_phy_generic_platform_data
*pdata
)
210 enum usb_phy_type type
= USB_PHY_TYPE_USB2
;
214 bool needs_vcc
= false;
217 struct device_node
*node
= dev
->of_node
;
219 if (of_property_read_u32(node
, "clock-frequency", &clk_rate
))
222 needs_vcc
= of_property_read_bool(node
, "vcc-supply");
223 nop
->gpiod_reset
= devm_gpiod_get_optional(dev
, "reset");
224 err
= PTR_ERR_OR_ZERO(nop
->gpiod_reset
);
226 nop
->gpiod_vbus
= devm_gpiod_get_optional(dev
,
228 err
= PTR_ERR_OR_ZERO(nop
->gpiod_vbus
);
232 clk_rate
= pdata
->clk_rate
;
233 needs_vcc
= pdata
->needs_vcc
;
234 if (gpio_is_valid(pdata
->gpio_reset
)) {
235 err
= devm_gpio_request_one(dev
, pdata
->gpio_reset
, 0,
239 gpio_to_desc(pdata
->gpio_reset
);
241 nop
->gpiod_vbus
= pdata
->gpiod_vbus
;
244 if (err
== -EPROBE_DEFER
)
245 return -EPROBE_DEFER
;
247 dev_err(dev
, "Error requesting RESET or VBUS GPIO\n");
250 if (nop
->gpiod_reset
)
251 gpiod_direction_output(nop
->gpiod_reset
, 1);
253 nop
->phy
.otg
= devm_kzalloc(dev
, sizeof(*nop
->phy
.otg
),
258 nop
->clk
= devm_clk_get(dev
, "main_clk");
259 if (IS_ERR(nop
->clk
)) {
260 dev_dbg(dev
, "Can't get phy clock: %ld\n",
264 if (!IS_ERR(nop
->clk
) && clk_rate
) {
265 err
= clk_set_rate(nop
->clk
, clk_rate
);
267 dev_err(dev
, "Error setting clock rate\n");
272 nop
->vcc
= devm_regulator_get(dev
, "vcc");
273 if (IS_ERR(nop
->vcc
)) {
274 dev_dbg(dev
, "Error getting vcc regulator: %ld\n",
277 return -EPROBE_DEFER
;
281 nop
->phy
.dev
= nop
->dev
;
282 nop
->phy
.label
= "nop-xceiv";
283 nop
->phy
.set_suspend
= nop_set_suspend
;
284 nop
->phy
.type
= type
;
286 nop
->phy
.otg
->state
= OTG_STATE_UNDEFINED
;
287 nop
->phy
.otg
->usb_phy
= &nop
->phy
;
288 nop
->phy
.otg
->set_host
= nop_set_host
;
289 nop
->phy
.otg
->set_peripheral
= nop_set_peripheral
;
293 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy
);
295 static int usb_phy_generic_probe(struct platform_device
*pdev
)
297 struct device
*dev
= &pdev
->dev
;
298 struct usb_phy_generic
*nop
;
301 nop
= devm_kzalloc(dev
, sizeof(*nop
), GFP_KERNEL
);
305 err
= usb_phy_gen_create_phy(dev
, nop
, dev_get_platdata(&pdev
->dev
));
308 if (nop
->gpiod_vbus
) {
309 err
= devm_request_threaded_irq(&pdev
->dev
,
310 gpiod_to_irq(nop
->gpiod_vbus
),
311 NULL
, nop_gpio_vbus_thread
,
312 VBUS_IRQ_FLAGS
, "vbus_detect",
315 dev_err(&pdev
->dev
, "can't request irq %i, err: %d\n",
316 gpiod_to_irq(nop
->gpiod_vbus
), err
);
321 nop
->phy
.init
= usb_gen_phy_init
;
322 nop
->phy
.shutdown
= usb_gen_phy_shutdown
;
324 err
= usb_add_phy_dev(&nop
->phy
);
326 dev_err(&pdev
->dev
, "can't register transceiver, err: %d\n",
331 platform_set_drvdata(pdev
, nop
);
336 static int usb_phy_generic_remove(struct platform_device
*pdev
)
338 struct usb_phy_generic
*nop
= platform_get_drvdata(pdev
);
340 usb_remove_phy(&nop
->phy
);
345 static const struct of_device_id nop_xceiv_dt_ids
[] = {
346 { .compatible
= "usb-nop-xceiv" },
350 MODULE_DEVICE_TABLE(of
, nop_xceiv_dt_ids
);
352 static struct platform_driver usb_phy_generic_driver
= {
353 .probe
= usb_phy_generic_probe
,
354 .remove
= usb_phy_generic_remove
,
356 .name
= "usb_phy_generic",
357 .of_match_table
= nop_xceiv_dt_ids
,
361 static int __init
usb_phy_generic_init(void)
363 return platform_driver_register(&usb_phy_generic_driver
);
365 subsys_initcall(usb_phy_generic_init
);
367 static void __exit
usb_phy_generic_exit(void)
369 platform_driver_unregister(&usb_phy_generic_driver
);
371 module_exit(usb_phy_generic_exit
);
373 MODULE_ALIAS("platform:usb_phy_generic");
374 MODULE_AUTHOR("Texas Instruments Inc");
375 MODULE_DESCRIPTION("NOP USB Transceiver driver");
376 MODULE_LICENSE("GPL");