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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 /* used to set vbus, in atomic path */
99 struct work_struct set_vbus_work;
100
101 int irq1;
102 int irq2;
103 u8 linkstat;
104 u8 asleep;
105 bool irq_enabled;
106 bool vbus_enable;
107 unsigned long features;
108};
109
110#define xceiv_to_twl(x) container_of((x), struct twl6030_usb, otg)
111
112/*-------------------------------------------------------------------------*/
113
114static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
115 u8 data, u8 address)
116{
117 int ret = 0;
118
119 ret = twl_i2c_write_u8(module, data, address);
120 if (ret < 0)
121 dev_err(twl->dev,
122 "Write[0x%x] Error %d\n", address, ret);
123 return ret;
124}
125
126static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
127{
128 u8 data, ret = 0;
129
130 ret = twl_i2c_read_u8(module, &data, address);
131 if (ret >= 0)
132 ret = data;
133 else
134 dev_err(twl->dev,
135 "readb[0x%x,0x%x] Error %d\n",
136 module, address, ret);
137 return ret;
138}
139
140/*-------------------------------------------------------------------------*/
141static int twl6030_set_phy_clk(struct otg_transceiver *x, int on)
142{
143 struct twl6030_usb *twl;
144 struct device *dev;
145 struct twl4030_usb_data *pdata;
146
147 twl = xceiv_to_twl(x);
148 dev = twl->dev;
149 pdata = dev->platform_data;
150
151 pdata->phy_set_clock(twl->dev, on);
152
153 return 0;
154}
155
156static int twl6030_phy_init(struct otg_transceiver *x)
157{
158 struct twl6030_usb *twl;
159 struct device *dev;
160 struct twl4030_usb_data *pdata;
161
162 twl = xceiv_to_twl(x);
163 dev = twl->dev;
164 pdata = dev->platform_data;
165
166 if (twl->linkstat == USB_EVENT_ID)
167 pdata->phy_power(twl->dev, 1, 1);
168 else
169 pdata->phy_power(twl->dev, 0, 1);
170
171 return 0;
172}
173
174static void twl6030_phy_shutdown(struct otg_transceiver *x)
175{
176 struct twl6030_usb *twl;
177 struct device *dev;
178 struct twl4030_usb_data *pdata;
179
180 twl = xceiv_to_twl(x);
181 dev = twl->dev;
182 pdata = dev->platform_data;
183 pdata->phy_power(twl->dev, 0, 0);
184}
185
186static int twl6030_phy_suspend(struct otg_transceiver *x, int suspend)
187{
188 struct twl6030_usb *twl = xceiv_to_twl(x);
189 struct device *dev = twl->dev;
190 struct twl4030_usb_data *pdata = dev->platform_data;
191
192 pdata->phy_suspend(dev, suspend);
193
194 return 0;
195}
196
197static int twl6030_start_srp(struct otg_transceiver *x)
198{
199 struct twl6030_usb *twl = xceiv_to_twl(x);
200
201 twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
202 twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
203
204 mdelay(100);
205 twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
206
207 return 0;
208}
209
210static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
211{
212 char *regulator_name;
213
214 if (twl->features & TWL6025_SUBCLASS)
215 regulator_name = "ldousb";
216 else
217 regulator_name = "vusb";
218
219 /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
220 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
221
222 /* Program CFG_LDO_PD2 register and set VUSB bit */
223 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
224
225 /* Program MISC2 register and set bit VUSB_IN_VBAT */
226 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
227
228 twl->usb3v3 = regulator_get(twl->dev, regulator_name);
229 if (IS_ERR(twl->usb3v3))
230 return -ENODEV;
231
232 /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
233 twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
234
235 /*
236 * Program the USB_ID_CTRL_SET register to enable GND drive
237 * and the ID comparators
238 */
239 twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
240
241 return 0;
242}
243
244static ssize_t twl6030_usb_vbus_show(struct device *dev,
245 struct device_attribute *attr, char *buf)
246{
247 struct twl6030_usb *twl = dev_get_drvdata(dev);
248 unsigned long flags;
249 int ret = -EINVAL;
250
251 spin_lock_irqsave(&twl->lock, flags);
252
253 switch (twl->linkstat) {
254 case USB_EVENT_VBUS:
255 ret = snprintf(buf, PAGE_SIZE, "vbus\n");
256 break;
257 case USB_EVENT_ID:
258 ret = snprintf(buf, PAGE_SIZE, "id\n");
259 break;
260 case USB_EVENT_NONE:
261 ret = snprintf(buf, PAGE_SIZE, "none\n");
262 break;
263 default:
264 ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
265 }
266 spin_unlock_irqrestore(&twl->lock, flags);
267
268 return ret;
269}
270static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
271
272static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
273{
274 struct twl6030_usb *twl = _twl;
275 int status;
276 u8 vbus_state, hw_state;
277
278 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
279
280 vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
281 CONTROLLER_STAT1);
282 if (!(hw_state & STS_USB_ID)) {
283 if (vbus_state & VBUS_DET) {
284 regulator_enable(twl->usb3v3);
285 twl->asleep = 1;
286 status = USB_EVENT_VBUS;
287 twl->otg.default_a = false;
288 twl->otg.state = OTG_STATE_B_IDLE;
289 twl->linkstat = status;
290 twl->otg.last_event = status;
291 atomic_notifier_call_chain(&twl->otg.notifier,
292 status, twl->otg.gadget);
293 } else {
294 status = USB_EVENT_NONE;
295 twl->linkstat = status;
296 twl->otg.last_event = status;
297 atomic_notifier_call_chain(&twl->otg.notifier,
298 status, twl->otg.gadget);
299 if (twl->asleep) {
300 regulator_disable(twl->usb3v3);
301 twl->asleep = 0;
302 }
303 }
304 }
305 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
306
307 return IRQ_HANDLED;
308}
309
310static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
311{
312 struct twl6030_usb *twl = _twl;
313 int status = USB_EVENT_NONE;
314 u8 hw_state;
315
316 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
317
318 if (hw_state & STS_USB_ID) {
319
320 regulator_enable(twl->usb3v3);
321 twl->asleep = 1;
322 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
323 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
324 0x10);
325 status = USB_EVENT_ID;
326 twl->otg.default_a = true;
327 twl->otg.state = OTG_STATE_A_IDLE;
328 twl->linkstat = status;
329 twl->otg.last_event = status;
330 atomic_notifier_call_chain(&twl->otg.notifier, status,
331 twl->otg.gadget);
332 } else {
333 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
334 0x10);
335 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
336 0x1);
337 }
338 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
339
340 return IRQ_HANDLED;
341}
342
343static int twl6030_set_peripheral(struct otg_transceiver *x,
344 struct usb_gadget *gadget)
345{
346 struct twl6030_usb *twl;
347
348 if (!x)
349 return -ENODEV;
350
351 twl = xceiv_to_twl(x);
352 twl->otg.gadget = gadget;
353 if (!gadget)
354 twl->otg.state = OTG_STATE_UNDEFINED;
355
356 return 0;
357}
358
359static int twl6030_enable_irq(struct otg_transceiver *x)
360{
361 struct twl6030_usb *twl = xceiv_to_twl(x);
362
363 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
364 twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
365 twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
366
367 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
368 REG_INT_MSK_LINE_C);
369 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
370 REG_INT_MSK_STS_C);
371 twl6030_usb_irq(twl->irq2, twl);
372 twl6030_usbotg_irq(twl->irq1, twl);
373
374 return 0;
375}
376
377static void otg_set_vbus_work(struct work_struct *data)
378{
379 struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
380 set_vbus_work);
381
382 /*
383 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
384 * register. This enables boost mode.
385 */
386
387 if (twl->vbus_enable)
388 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
389 CHARGERUSB_CTRL1);
390 else
391 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
392 CHARGERUSB_CTRL1);
393}
394
395static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
396{
397 struct twl6030_usb *twl = xceiv_to_twl(x);
398
399 twl->vbus_enable = enabled;
400 schedule_work(&twl->set_vbus_work);
401
402 return 0;
403}
404
405static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host)
406{
407 struct twl6030_usb *twl;
408
409 if (!x)
410 return -ENODEV;
411
412 twl = xceiv_to_twl(x);
413 twl->otg.host = host;
414 if (!host)
415 twl->otg.state = OTG_STATE_UNDEFINED;
416 return 0;
417}
418
419static int __devinit twl6030_usb_probe(struct platform_device *pdev)
420{
421 struct twl6030_usb *twl;
422 int status, err;
423 struct twl4030_usb_data *pdata;
424 struct device *dev = &pdev->dev;
425 pdata = dev->platform_data;
426
427 twl = kzalloc(sizeof *twl, GFP_KERNEL);
428 if (!twl)
429 return -ENOMEM;
430
431 twl->dev = &pdev->dev;
432 twl->irq1 = platform_get_irq(pdev, 0);
433 twl->irq2 = platform_get_irq(pdev, 1);
434 twl->features = pdata->features;
435 twl->otg.dev = twl->dev;
436 twl->otg.label = "twl6030";
437 twl->otg.set_host = twl6030_set_host;
438 twl->otg.set_peripheral = twl6030_set_peripheral;
439 twl->otg.set_vbus = twl6030_set_vbus;
440 twl->otg.init = twl6030_phy_init;
441 twl->otg.shutdown = twl6030_phy_shutdown;
442 twl->otg.set_suspend = twl6030_phy_suspend;
443 twl->otg.start_srp = twl6030_start_srp;
444
445 /* init spinlock for workqueue */
446 spin_lock_init(&twl->lock);
447
448 err = twl6030_usb_ldo_init(twl);
449 if (err) {
450 dev_err(&pdev->dev, "ldo init failed\n");
451 kfree(twl);
452 return err;
453 }
454 otg_set_transceiver(&twl->otg);
455
456 platform_set_drvdata(pdev, twl);
457 if (device_create_file(&pdev->dev, &dev_attr_vbus))
458 dev_warn(&pdev->dev, "could not create sysfs file\n");
459
460 ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
461
462 INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
463
464 twl->irq_enabled = true;
465 status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
466 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
467 "twl6030_usb", twl);
468 if (status < 0) {
469 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
470 twl->irq1, status);
471 device_remove_file(twl->dev, &dev_attr_vbus);
472 kfree(twl);
473 return status;
474 }
475
476 status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
477 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
478 "twl6030_usb", twl);
479 if (status < 0) {
480 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
481 twl->irq2, status);
482 free_irq(twl->irq1, twl);
483 device_remove_file(twl->dev, &dev_attr_vbus);
484 kfree(twl);
485 return status;
486 }
487
488 twl->asleep = 0;
489 pdata->phy_init(dev);
490 twl6030_phy_suspend(&twl->otg, 0);
491 twl6030_enable_irq(&twl->otg);
492 dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
493
494 return 0;
495}
496
497static int __exit twl6030_usb_remove(struct platform_device *pdev)
498{
499 struct twl6030_usb *twl = platform_get_drvdata(pdev);
500
501 struct twl4030_usb_data *pdata;
502 struct device *dev = &pdev->dev;
503 pdata = dev->platform_data;
504
505 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
506 REG_INT_MSK_LINE_C);
507 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
508 REG_INT_MSK_STS_C);
509 free_irq(twl->irq1, twl);
510 free_irq(twl->irq2, twl);
511 regulator_put(twl->usb3v3);
512 pdata->phy_exit(twl->dev);
513 device_remove_file(twl->dev, &dev_attr_vbus);
514 cancel_work_sync(&twl->set_vbus_work);
515 kfree(twl);
516
517 return 0;
518}
519
520static struct platform_driver twl6030_usb_driver = {
521 .probe = twl6030_usb_probe,
522 .remove = __exit_p(twl6030_usb_remove),
523 .driver = {
524 .name = "twl6030_usb",
525 .owner = THIS_MODULE,
526 },
527};
528
529static int __init twl6030_usb_init(void)
530{
531 return platform_driver_register(&twl6030_usb_driver);
532}
533subsys_initcall(twl6030_usb_init);
534
535static void __exit twl6030_usb_exit(void)
536{
537 platform_driver_unregister(&twl6030_usb_driver);
538}
539module_exit(twl6030_usb_exit);
540
541MODULE_ALIAS("platform:twl6030_usb");
542MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
543MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
544MODULE_LICENSE("GPL");