tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
91struct 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
117static 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
129static 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
144static 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
157static 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
184static 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}
210static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
211
212static 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
254static 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
285static 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
294static 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
308static 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
326static 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
336static 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
412static 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
430static const struct of_device_id twl6030_usb_id_table[] = {
431 { .compatible = "ti,twl6030-usb" },
432 {}
433};
434MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
435
436static 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
445static int __init twl6030_usb_init(void)
446{
447 return platform_driver_register(&twl6030_usb_driver);
448}
449subsys_initcall(twl6030_usb_init);
450
451static void __exit twl6030_usb_exit(void)
452{
453 platform_driver_unregister(&twl6030_usb_driver);
454}
455module_exit(twl6030_usb_exit);
456
457MODULE_ALIAS("platform:twl6030_usb");
458MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
459MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
460MODULE_LICENSE("GPL");