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path: root/drivers/usb/otg/twl6030-usb.c
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Diffstat (limited to 'drivers/usb/otg/twl6030-usb.c')
-rw-r--r--drivers/usb/otg/twl6030-usb.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/drivers/usb/otg/twl6030-usb.c b/drivers/usb/otg/twl6030-usb.c
new file mode 100644
index 000000000000..cfb5aa72b196
--- /dev/null
+++ b/drivers/usb/otg/twl6030-usb.c
@@ -0,0 +1,526 @@
1/*
2 * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
3 *
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * Author: Hema HK <hemahk@ti.com>
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/interrupt.h>
26#include <linux/platform_device.h>
27#include <linux/io.h>
28#include <linux/usb/otg.h>
29#include <linux/i2c/twl.h>
30#include <linux/regulator/consumer.h>
31#include <linux/err.h>
32#include <linux/notifier.h>
33#include <linux/slab.h>
34#include <linux/delay.h>
35
36/* usb register definitions */
37#define USB_VENDOR_ID_LSB 0x00
38#define USB_VENDOR_ID_MSB 0x01
39#define USB_PRODUCT_ID_LSB 0x02
40#define USB_PRODUCT_ID_MSB 0x03
41#define USB_VBUS_CTRL_SET 0x04
42#define USB_VBUS_CTRL_CLR 0x05
43#define USB_ID_CTRL_SET 0x06
44#define USB_ID_CTRL_CLR 0x07
45#define USB_VBUS_INT_SRC 0x08
46#define USB_VBUS_INT_LATCH_SET 0x09
47#define USB_VBUS_INT_LATCH_CLR 0x0A
48#define USB_VBUS_INT_EN_LO_SET 0x0B
49#define USB_VBUS_INT_EN_LO_CLR 0x0C
50#define USB_VBUS_INT_EN_HI_SET 0x0D
51#define USB_VBUS_INT_EN_HI_CLR 0x0E
52#define USB_ID_INT_SRC 0x0F
53#define USB_ID_INT_LATCH_SET 0x10
54#define USB_ID_INT_LATCH_CLR 0x11
55
56#define USB_ID_INT_EN_LO_SET 0x12
57#define USB_ID_INT_EN_LO_CLR 0x13
58#define USB_ID_INT_EN_HI_SET 0x14
59#define USB_ID_INT_EN_HI_CLR 0x15
60#define USB_OTG_ADP_CTRL 0x16
61#define USB_OTG_ADP_HIGH 0x17
62#define USB_OTG_ADP_LOW 0x18
63#define USB_OTG_ADP_RISE 0x19
64#define USB_OTG_REVISION 0x1A
65
66/* to be moved to LDO */
67#define TWL6030_MISC2 0xE5
68#define TWL6030_CFG_LDO_PD2 0xF5
69#define TWL6030_BACKUP_REG 0xFA
70
71#define STS_HW_CONDITIONS 0x21
72
73/* In module TWL6030_MODULE_PM_MASTER */
74#define STS_HW_CONDITIONS 0x21
75#define STS_USB_ID BIT(2)
76
77/* In module TWL6030_MODULE_PM_RECEIVER */
78#define VUSB_CFG_TRANS 0x71
79#define VUSB_CFG_STATE 0x72
80#define VUSB_CFG_VOLTAGE 0x73
81
82/* in module TWL6030_MODULE_MAIN_CHARGE */
83
84#define CHARGERUSB_CTRL1 0x8
85
86#define CONTROLLER_STAT1 0x03
87#define VBUS_DET BIT(2)
88
89struct twl6030_usb {
90 struct otg_transceiver otg;
91 struct device *dev;
92
93 /* for vbus reporting with irqs disabled */
94 spinlock_t lock;
95
96 struct regulator *usb3v3;
97
98 int irq1;
99 int irq2;
100 u8 linkstat;
101 u8 asleep;
102 bool irq_enabled;
103 unsigned long features;
104};
105
106#define xceiv_to_twl(x) container_of((x), struct twl6030_usb, otg)
107
108/*-------------------------------------------------------------------------*/
109
110static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
111 u8 data, u8 address)
112{
113 int ret = 0;
114
115 ret = twl_i2c_write_u8(module, data, address);
116 if (ret < 0)
117 dev_err(twl->dev,
118 "Write[0x%x] Error %d\n", address, ret);
119 return ret;
120}
121
122static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
123{
124 u8 data, ret = 0;
125
126 ret = twl_i2c_read_u8(module, &data, address);
127 if (ret >= 0)
128 ret = data;
129 else
130 dev_err(twl->dev,
131 "readb[0x%x,0x%x] Error %d\n",
132 module, address, ret);
133 return ret;
134}
135
136/*-------------------------------------------------------------------------*/
137static int twl6030_set_phy_clk(struct otg_transceiver *x, int on)
138{
139 struct twl6030_usb *twl;
140 struct device *dev;
141 struct twl4030_usb_data *pdata;
142
143 twl = xceiv_to_twl(x);
144 dev = twl->dev;
145 pdata = dev->platform_data;
146
147 pdata->phy_set_clock(twl->dev, on);
148
149 return 0;
150}
151
152static int twl6030_phy_init(struct otg_transceiver *x)
153{
154 struct twl6030_usb *twl;
155 struct device *dev;
156 struct twl4030_usb_data *pdata;
157
158 twl = xceiv_to_twl(x);
159 dev = twl->dev;
160 pdata = dev->platform_data;
161
162 if (twl->linkstat == USB_EVENT_ID)
163 pdata->phy_power(twl->dev, 1, 1);
164 else
165 pdata->phy_power(twl->dev, 0, 1);
166
167 return 0;
168}
169
170static void twl6030_phy_shutdown(struct otg_transceiver *x)
171{
172 struct twl6030_usb *twl;
173 struct device *dev;
174 struct twl4030_usb_data *pdata;
175
176 twl = xceiv_to_twl(x);
177 dev = twl->dev;
178 pdata = dev->platform_data;
179 pdata->phy_power(twl->dev, 0, 0);
180}
181
182static int twl6030_phy_suspend(struct otg_transceiver *x, int suspend)
183{
184 struct twl6030_usb *twl = xceiv_to_twl(x);
185 struct device *dev = twl->dev;
186 struct twl4030_usb_data *pdata = dev->platform_data;
187
188 pdata->phy_suspend(dev, suspend);
189
190 return 0;
191}
192
193static int twl6030_start_srp(struct otg_transceiver *x)
194{
195 struct twl6030_usb *twl = xceiv_to_twl(x);
196
197 twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
198 twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
199
200 mdelay(100);
201 twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
202
203 return 0;
204}
205
206static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
207{
208 char *regulator_name;
209
210 if (twl->features & TWL6025_SUBCLASS)
211 regulator_name = "ldousb";
212 else
213 regulator_name = "vusb";
214
215 /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
216 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
217
218 /* Program CFG_LDO_PD2 register and set VUSB bit */
219 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
220
221 /* Program MISC2 register and set bit VUSB_IN_VBAT */
222 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
223
224 twl->usb3v3 = regulator_get(twl->dev, regulator_name);
225 if (IS_ERR(twl->usb3v3))
226 return -ENODEV;
227
228 /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
229 twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
230
231 /*
232 * Program the USB_ID_CTRL_SET register to enable GND drive
233 * and the ID comparators
234 */
235 twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
236
237 return 0;
238}
239
240static ssize_t twl6030_usb_vbus_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242{
243 struct twl6030_usb *twl = dev_get_drvdata(dev);
244 unsigned long flags;
245 int ret = -EINVAL;
246
247 spin_lock_irqsave(&twl->lock, flags);
248
249 switch (twl->linkstat) {
250 case USB_EVENT_VBUS:
251 ret = snprintf(buf, PAGE_SIZE, "vbus\n");
252 break;
253 case USB_EVENT_ID:
254 ret = snprintf(buf, PAGE_SIZE, "id\n");
255 break;
256 case USB_EVENT_NONE:
257 ret = snprintf(buf, PAGE_SIZE, "none\n");
258 break;
259 default:
260 ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
261 }
262 spin_unlock_irqrestore(&twl->lock, flags);
263
264 return ret;
265}
266static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
267
268static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
269{
270 struct twl6030_usb *twl = _twl;
271 int status;
272 u8 vbus_state, hw_state;
273
274 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
275
276 vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
277 CONTROLLER_STAT1);
278 if (!(hw_state & STS_USB_ID)) {
279 if (vbus_state & VBUS_DET) {
280 regulator_enable(twl->usb3v3);
281 twl->asleep = 1;
282 status = USB_EVENT_VBUS;
283 twl->otg.default_a = false;
284 twl->otg.state = OTG_STATE_B_IDLE;
285 twl->linkstat = status;
286 twl->otg.last_event = status;
287 atomic_notifier_call_chain(&twl->otg.notifier,
288 status, twl->otg.gadget);
289 } else {
290 status = USB_EVENT_NONE;
291 twl->linkstat = status;
292 twl->otg.last_event = status;
293 atomic_notifier_call_chain(&twl->otg.notifier,
294 status, twl->otg.gadget);
295 if (twl->asleep) {
296 regulator_disable(twl->usb3v3);
297 twl->asleep = 0;
298 }
299 }
300 }
301 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
302
303 return IRQ_HANDLED;
304}
305
306static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
307{
308 struct twl6030_usb *twl = _twl;
309 int status = USB_EVENT_NONE;
310 u8 hw_state;
311
312 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
313
314 if (hw_state & STS_USB_ID) {
315
316 regulator_enable(twl->usb3v3);
317 twl->asleep = 1;
318 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
319 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
320 0x10);
321 status = USB_EVENT_ID;
322 twl->otg.default_a = true;
323 twl->otg.state = OTG_STATE_A_IDLE;
324 twl->linkstat = status;
325 twl->otg.last_event = status;
326 atomic_notifier_call_chain(&twl->otg.notifier, status,
327 twl->otg.gadget);
328 } else {
329 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
330 0x10);
331 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
332 0x1);
333 }
334 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
335
336 return IRQ_HANDLED;
337}
338
339static int twl6030_set_peripheral(struct otg_transceiver *x,
340 struct usb_gadget *gadget)
341{
342 struct twl6030_usb *twl;
343
344 if (!x)
345 return -ENODEV;
346
347 twl = xceiv_to_twl(x);
348 twl->otg.gadget = gadget;
349 if (!gadget)
350 twl->otg.state = OTG_STATE_UNDEFINED;
351
352 return 0;
353}
354
355static int twl6030_enable_irq(struct otg_transceiver *x)
356{
357 struct twl6030_usb *twl = xceiv_to_twl(x);
358
359 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
360 twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
361 twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
362
363 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
364 REG_INT_MSK_LINE_C);
365 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
366 REG_INT_MSK_STS_C);
367 twl6030_usb_irq(twl->irq2, twl);
368 twl6030_usbotg_irq(twl->irq1, twl);
369
370 return 0;
371}
372
373static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
374{
375 struct twl6030_usb *twl = xceiv_to_twl(x);
376
377 /*
378 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
379 * register. This enables boost mode.
380 */
381 if (enabled)
382 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
383 CHARGERUSB_CTRL1);
384 else
385 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
386 CHARGERUSB_CTRL1);
387 return 0;
388}
389
390static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host)
391{
392 struct twl6030_usb *twl;
393
394 if (!x)
395 return -ENODEV;
396
397 twl = xceiv_to_twl(x);
398 twl->otg.host = host;
399 if (!host)
400 twl->otg.state = OTG_STATE_UNDEFINED;
401 return 0;
402}
403
404static int __devinit twl6030_usb_probe(struct platform_device *pdev)
405{
406 struct twl6030_usb *twl;
407 int status, err;
408 struct twl4030_usb_data *pdata;
409 struct device *dev = &pdev->dev;
410 pdata = dev->platform_data;
411
412 twl = kzalloc(sizeof *twl, GFP_KERNEL);
413 if (!twl)
414 return -ENOMEM;
415
416 twl->dev = &pdev->dev;
417 twl->irq1 = platform_get_irq(pdev, 0);
418 twl->irq2 = platform_get_irq(pdev, 1);
419 twl->features = pdata->features;
420 twl->otg.dev = twl->dev;
421 twl->otg.label = "twl6030";
422 twl->otg.set_host = twl6030_set_host;
423 twl->otg.set_peripheral = twl6030_set_peripheral;
424 twl->otg.set_vbus = twl6030_set_vbus;
425 twl->otg.init = twl6030_phy_init;
426 twl->otg.shutdown = twl6030_phy_shutdown;
427 twl->otg.set_suspend = twl6030_phy_suspend;
428 twl->otg.start_srp = twl6030_start_srp;
429
430 /* init spinlock for workqueue */
431 spin_lock_init(&twl->lock);
432
433 err = twl6030_usb_ldo_init(twl);
434 if (err) {
435 dev_err(&pdev->dev, "ldo init failed\n");
436 kfree(twl);
437 return err;
438 }
439 otg_set_transceiver(&twl->otg);
440
441 platform_set_drvdata(pdev, twl);
442 if (device_create_file(&pdev->dev, &dev_attr_vbus))
443 dev_warn(&pdev->dev, "could not create sysfs file\n");
444
445 ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
446
447 twl->irq_enabled = true;
448 status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
449 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
450 "twl6030_usb", twl);
451 if (status < 0) {
452 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
453 twl->irq1, status);
454 device_remove_file(twl->dev, &dev_attr_vbus);
455 kfree(twl);
456 return status;
457 }
458
459 status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
460 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
461 "twl6030_usb", twl);
462 if (status < 0) {
463 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
464 twl->irq2, status);
465 free_irq(twl->irq1, twl);
466 device_remove_file(twl->dev, &dev_attr_vbus);
467 kfree(twl);
468 return status;
469 }
470
471 twl->asleep = 0;
472 pdata->phy_init(dev);
473 twl6030_phy_suspend(&twl->otg, 0);
474 twl6030_enable_irq(&twl->otg);
475 dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
476
477 return 0;
478}
479
480static int __exit twl6030_usb_remove(struct platform_device *pdev)
481{
482 struct twl6030_usb *twl = platform_get_drvdata(pdev);
483
484 struct twl4030_usb_data *pdata;
485 struct device *dev = &pdev->dev;
486 pdata = dev->platform_data;
487
488 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
489 REG_INT_MSK_LINE_C);
490 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
491 REG_INT_MSK_STS_C);
492 free_irq(twl->irq1, twl);
493 free_irq(twl->irq2, twl);
494 regulator_put(twl->usb3v3);
495 pdata->phy_exit(twl->dev);
496 device_remove_file(twl->dev, &dev_attr_vbus);
497 kfree(twl);
498
499 return 0;
500}
501
502static struct platform_driver twl6030_usb_driver = {
503 .probe = twl6030_usb_probe,
504 .remove = __exit_p(twl6030_usb_remove),
505 .driver = {
506 .name = "twl6030_usb",
507 .owner = THIS_MODULE,
508 },
509};
510
511static int __init twl6030_usb_init(void)
512{
513 return platform_driver_register(&twl6030_usb_driver);
514}
515subsys_initcall(twl6030_usb_init);
516
517static void __exit twl6030_usb_exit(void)
518{
519 platform_driver_unregister(&twl6030_usb_driver);
520}
521module_exit(twl6030_usb_exit);
522
523MODULE_ALIAS("platform:twl6030_usb");
524MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
525MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
526MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-07-28 23:19:43 -0400