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/musb.h>
29 #include <linux/usb/phy_companion.h>
30 #include <linux/phy/omap_usb.h>
31 #include <linux/i2c/twl.h>
32 #include <linux/regulator/consumer.h>
33 #include <linux/err.h>
34 #include <linux/slab.h>
35 #include <linux/delay.h>
36 #include <linux/of.h>
37 
38 /* usb register definitions */
39 #define USB_VENDOR_ID_LSB		0x00
40 #define USB_VENDOR_ID_MSB		0x01
41 #define USB_PRODUCT_ID_LSB		0x02
42 #define USB_PRODUCT_ID_MSB		0x03
43 #define USB_VBUS_CTRL_SET		0x04
44 #define USB_VBUS_CTRL_CLR		0x05
45 #define USB_ID_CTRL_SET			0x06
46 #define USB_ID_CTRL_CLR			0x07
47 #define USB_VBUS_INT_SRC		0x08
48 #define USB_VBUS_INT_LATCH_SET		0x09
49 #define USB_VBUS_INT_LATCH_CLR		0x0A
50 #define USB_VBUS_INT_EN_LO_SET		0x0B
51 #define USB_VBUS_INT_EN_LO_CLR		0x0C
52 #define USB_VBUS_INT_EN_HI_SET		0x0D
53 #define USB_VBUS_INT_EN_HI_CLR		0x0E
54 #define USB_ID_INT_SRC			0x0F
55 #define USB_ID_INT_LATCH_SET		0x10
56 #define USB_ID_INT_LATCH_CLR		0x11
57 
58 #define USB_ID_INT_EN_LO_SET		0x12
59 #define USB_ID_INT_EN_LO_CLR		0x13
60 #define USB_ID_INT_EN_HI_SET		0x14
61 #define USB_ID_INT_EN_HI_CLR		0x15
62 #define USB_OTG_ADP_CTRL		0x16
63 #define USB_OTG_ADP_HIGH		0x17
64 #define USB_OTG_ADP_LOW			0x18
65 #define USB_OTG_ADP_RISE		0x19
66 #define USB_OTG_REVISION		0x1A
67 
68 /* to be moved to LDO */
69 #define TWL6030_MISC2			0xE5
70 #define TWL6030_CFG_LDO_PD2		0xF5
71 #define TWL6030_BACKUP_REG		0xFA
72 
73 #define STS_HW_CONDITIONS		0x21
74 
75 /* In module TWL6030_MODULE_PM_MASTER */
76 #define STS_HW_CONDITIONS		0x21
77 #define STS_USB_ID			BIT(2)
78 
79 /* In module TWL6030_MODULE_PM_RECEIVER */
80 #define VUSB_CFG_TRANS			0x71
81 #define VUSB_CFG_STATE			0x72
82 #define VUSB_CFG_VOLTAGE		0x73
83 
84 /* in module TWL6030_MODULE_MAIN_CHARGE */
85 
86 #define CHARGERUSB_CTRL1		0x8
87 
88 #define CONTROLLER_STAT1		0x03
89 #define	VBUS_DET			BIT(2)
90 
91 struct twl6030_usb {
92 	struct phy_companion	comparator;
93 	struct device		*dev;
94 
95 	/* for vbus reporting with irqs disabled */
96 	spinlock_t		lock;
97 
98 	struct regulator		*usb3v3;
99 
100 	/* used to check initial cable status after probe */
101 	struct delayed_work	get_status_work;
102 
103 	/* used to set vbus, in atomic path */
104 	struct work_struct	set_vbus_work;
105 
106 	int			irq1;
107 	int			irq2;
108 	enum musb_vbus_id_status linkstat;
109 	u8			asleep;
110 	bool			vbus_enable;
111 };
112 
113 #define	comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
114 
115 /*-------------------------------------------------------------------------*/
116 
117 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
118 						u8 data, u8 address)
119 {
120 	int ret = 0;
121 
122 	ret = twl_i2c_write_u8(module, data, address);
123 	if (ret < 0)
124 		dev_err(twl->dev,
125 			"Write[0x%x] Error %d\n", address, ret);
126 	return ret;
127 }
128 
129 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
130 {
131 	u8 data;
132 	int ret;
133 
134 	ret = twl_i2c_read_u8(module, &data, address);
135 	if (ret >= 0)
136 		ret = data;
137 	else
138 		dev_err(twl->dev,
139 			"readb[0x%x,0x%x] Error %d\n",
140 					module, address, ret);
141 	return ret;
142 }
143 
144 static int twl6030_start_srp(struct phy_companion *comparator)
145 {
146 	struct twl6030_usb *twl = comparator_to_twl(comparator);
147 
148 	twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
149 	twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
150 
151 	mdelay(100);
152 	twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
153 
154 	return 0;
155 }
156 
157 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
158 {
159 	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
160 	twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
161 
162 	/* Program CFG_LDO_PD2 register and set VUSB bit */
163 	twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
164 
165 	/* Program MISC2 register and set bit VUSB_IN_VBAT */
166 	twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
167 
168 	twl->usb3v3 = regulator_get(twl->dev, "usb");
169 	if (IS_ERR(twl->usb3v3))
170 		return -ENODEV;
171 
172 	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
173 	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
174 
175 	/*
176 	 * Program the USB_ID_CTRL_SET register to enable GND drive
177 	 * and the ID comparators
178 	 */
179 	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
180 
181 	return 0;
182 }
183 
184 static ssize_t twl6030_usb_vbus_show(struct device *dev,
185 			struct device_attribute *attr, char *buf)
186 {
187 	struct twl6030_usb *twl = dev_get_drvdata(dev);
188 	unsigned long flags;
189 	int ret = -EINVAL;
190 
191 	spin_lock_irqsave(&twl->lock, flags);
192 
193 	switch (twl->linkstat) {
194 	case MUSB_VBUS_VALID:
195 	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
196 	       break;
197 	case MUSB_ID_GROUND:
198 	       ret = snprintf(buf, PAGE_SIZE, "id\n");
199 	       break;
200 	case MUSB_VBUS_OFF:
201 	       ret = snprintf(buf, PAGE_SIZE, "none\n");
202 	       break;
203 	default:
204 	       ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
205 	}
206 	spin_unlock_irqrestore(&twl->lock, flags);
207 
208 	return ret;
209 }
210 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
211 
212 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
213 {
214 	struct twl6030_usb *twl = _twl;
215 	enum musb_vbus_id_status status = MUSB_UNKNOWN;
216 	u8 vbus_state, hw_state;
217 	int ret;
218 
219 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
220 
221 	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
222 						CONTROLLER_STAT1);
223 	if (!(hw_state & STS_USB_ID)) {
224 		if (vbus_state & VBUS_DET) {
225 			ret = regulator_enable(twl->usb3v3);
226 			if (ret)
227 				dev_err(twl->dev, "Failed to enable usb3v3\n");
228 
229 			twl->asleep = 1;
230 			status = MUSB_VBUS_VALID;
231 			twl->linkstat = status;
232 			ret = musb_mailbox(status);
233 			if (ret)
234 				twl->linkstat = MUSB_UNKNOWN;
235 		} else {
236 			if (twl->linkstat != MUSB_UNKNOWN) {
237 				status = MUSB_VBUS_OFF;
238 				twl->linkstat = status;
239 				ret = musb_mailbox(status);
240 				if (ret)
241 					twl->linkstat = MUSB_UNKNOWN;
242 				if (twl->asleep) {
243 					regulator_disable(twl->usb3v3);
244 					twl->asleep = 0;
245 				}
246 			}
247 		}
248 	}
249 	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
250 
251 	return IRQ_HANDLED;
252 }
253 
254 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
255 {
256 	struct twl6030_usb *twl = _twl;
257 	enum musb_vbus_id_status status = MUSB_UNKNOWN;
258 	u8 hw_state;
259 	int ret;
260 
261 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
262 
263 	if (hw_state & STS_USB_ID) {
264 		ret = regulator_enable(twl->usb3v3);
265 		if (ret)
266 			dev_err(twl->dev, "Failed to enable usb3v3\n");
267 
268 		twl->asleep = 1;
269 		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
270 		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
271 		status = MUSB_ID_GROUND;
272 		twl->linkstat = status;
273 		ret = musb_mailbox(status);
274 		if (ret)
275 			twl->linkstat = MUSB_UNKNOWN;
276 	} else  {
277 		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
278 		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
279 	}
280 	twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
281 
282 	return IRQ_HANDLED;
283 }
284 
285 static void twl6030_status_work(struct work_struct *work)
286 {
287 	struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
288 					       get_status_work.work);
289 
290 	twl6030_usb_irq(twl->irq2, twl);
291 	twl6030_usbotg_irq(twl->irq1, twl);
292 }
293 
294 static int twl6030_enable_irq(struct twl6030_usb *twl)
295 {
296 	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
297 	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
298 	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
299 
300 	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
301 				REG_INT_MSK_LINE_C);
302 	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
303 				REG_INT_MSK_STS_C);
304 
305 	return 0;
306 }
307 
308 static void otg_set_vbus_work(struct work_struct *data)
309 {
310 	struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
311 								set_vbus_work);
312 
313 	/*
314 	 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
315 	 * register. This enables boost mode.
316 	 */
317 
318 	if (twl->vbus_enable)
319 		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
320 							CHARGERUSB_CTRL1);
321 	else
322 		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
323 							CHARGERUSB_CTRL1);
324 }
325 
326 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
327 {
328 	struct twl6030_usb *twl = comparator_to_twl(comparator);
329 
330 	twl->vbus_enable = enabled;
331 	schedule_work(&twl->set_vbus_work);
332 
333 	return 0;
334 }
335 
336 static int twl6030_usb_probe(struct platform_device *pdev)
337 {
338 	u32 ret;
339 	struct twl6030_usb	*twl;
340 	int			status, err;
341 	struct device_node	*np = pdev->dev.of_node;
342 	struct device		*dev = &pdev->dev;
343 
344 	if (!np) {
345 		dev_err(dev, "no DT info\n");
346 		return -EINVAL;
347 	}
348 
349 	twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
350 	if (!twl)
351 		return -ENOMEM;
352 
353 	twl->dev		= &pdev->dev;
354 	twl->irq1		= platform_get_irq(pdev, 0);
355 	twl->irq2		= platform_get_irq(pdev, 1);
356 	twl->linkstat		= MUSB_UNKNOWN;
357 
358 	twl->comparator.set_vbus	= twl6030_set_vbus;
359 	twl->comparator.start_srp	= twl6030_start_srp;
360 
361 	ret = omap_usb2_set_comparator(&twl->comparator);
362 	if (ret == -ENODEV) {
363 		dev_info(&pdev->dev, "phy not ready, deferring probe");
364 		return -EPROBE_DEFER;
365 	}
366 
367 	/* init spinlock for workqueue */
368 	spin_lock_init(&twl->lock);
369 
370 	err = twl6030_usb_ldo_init(twl);
371 	if (err) {
372 		dev_err(&pdev->dev, "ldo init failed\n");
373 		return err;
374 	}
375 
376 	platform_set_drvdata(pdev, twl);
377 	if (device_create_file(&pdev->dev, &dev_attr_vbus))
378 		dev_warn(&pdev->dev, "could not create sysfs file\n");
379 
380 	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
381 	INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
382 
383 	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
384 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
385 			"twl6030_usb", twl);
386 	if (status < 0) {
387 		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
388 			twl->irq1, status);
389 		device_remove_file(twl->dev, &dev_attr_vbus);
390 		return status;
391 	}
392 
393 	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
394 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
395 			"twl6030_usb", twl);
396 	if (status < 0) {
397 		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
398 			twl->irq2, status);
399 		free_irq(twl->irq1, twl);
400 		device_remove_file(twl->dev, &dev_attr_vbus);
401 		return status;
402 	}
403 
404 	twl->asleep = 0;
405 	twl6030_enable_irq(twl);
406 	schedule_delayed_work(&twl->get_status_work, HZ);
407 	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
408 
409 	return 0;
410 }
411 
412 static int twl6030_usb_remove(struct platform_device *pdev)
413 {
414 	struct twl6030_usb *twl = platform_get_drvdata(pdev);
415 
416 	cancel_delayed_work(&twl->get_status_work);
417 	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
418 		REG_INT_MSK_LINE_C);
419 	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
420 			REG_INT_MSK_STS_C);
421 	free_irq(twl->irq1, twl);
422 	free_irq(twl->irq2, twl);
423 	regulator_put(twl->usb3v3);
424 	device_remove_file(twl->dev, &dev_attr_vbus);
425 	cancel_work_sync(&twl->set_vbus_work);
426 
427 	return 0;
428 }
429 
430 static const struct of_device_id twl6030_usb_id_table[] = {
431 	{ .compatible = "ti,twl6030-usb" },
432 	{}
433 };
434 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
435 
436 static struct platform_driver twl6030_usb_driver = {
437 	.probe		= twl6030_usb_probe,
438 	.remove		= twl6030_usb_remove,
439 	.driver		= {
440 		.name	= "twl6030_usb",
441 		.of_match_table = of_match_ptr(twl6030_usb_id_table),
442 	},
443 };
444 
445 static int __init twl6030_usb_init(void)
446 {
447 	return platform_driver_register(&twl6030_usb_driver);
448 }
449 subsys_initcall(twl6030_usb_init);
450 
451 static void __exit twl6030_usb_exit(void)
452 {
453 	platform_driver_unregister(&twl6030_usb_driver);
454 }
455 module_exit(twl6030_usb_exit);
456 
457 MODULE_ALIAS("platform:twl6030_usb");
458 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
459 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
460 MODULE_LICENSE("GPL");
461