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-omap.h>
29#include <linux/usb/phy_companion.h>
30#include <linux/usb/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
37/* usb register definitions */
38#define USB_VENDOR_ID_LSB 0x00
39#define USB_VENDOR_ID_MSB 0x01
40#define USB_PRODUCT_ID_LSB 0x02
41#define USB_PRODUCT_ID_MSB 0x03
42#define USB_VBUS_CTRL_SET 0x04
43#define USB_VBUS_CTRL_CLR 0x05
44#define USB_ID_CTRL_SET 0x06
45#define USB_ID_CTRL_CLR 0x07
46#define USB_VBUS_INT_SRC 0x08
47#define USB_VBUS_INT_LATCH_SET 0x09
48#define USB_VBUS_INT_LATCH_CLR 0x0A
49#define USB_VBUS_INT_EN_LO_SET 0x0B
50#define USB_VBUS_INT_EN_LO_CLR 0x0C
51#define USB_VBUS_INT_EN_HI_SET 0x0D
52#define USB_VBUS_INT_EN_HI_CLR 0x0E
53#define USB_ID_INT_SRC 0x0F
54#define USB_ID_INT_LATCH_SET 0x10
55#define USB_ID_INT_LATCH_CLR 0x11
56
57#define USB_ID_INT_EN_LO_SET 0x12
58#define USB_ID_INT_EN_LO_CLR 0x13
59#define USB_ID_INT_EN_HI_SET 0x14
60#define USB_ID_INT_EN_HI_CLR 0x15
61#define USB_OTG_ADP_CTRL 0x16
62#define USB_OTG_ADP_HIGH 0x17
63#define USB_OTG_ADP_LOW 0x18
64#define USB_OTG_ADP_RISE 0x19
65#define USB_OTG_REVISION 0x1A
66
67/* to be moved to LDO */
68#define TWL6030_MISC2 0xE5
69#define TWL6030_CFG_LDO_PD2 0xF5
70#define TWL6030_BACKUP_REG 0xFA
71
72#define STS_HW_CONDITIONS 0x21
73
74/* In module TWL6030_MODULE_PM_MASTER */
75#define STS_HW_CONDITIONS 0x21
76#define STS_USB_ID BIT(2)
77
78/* In module TWL6030_MODULE_PM_RECEIVER */
79#define VUSB_CFG_TRANS 0x71
80#define VUSB_CFG_STATE 0x72
81#define VUSB_CFG_VOLTAGE 0x73
82
83/* in module TWL6030_MODULE_MAIN_CHARGE */
84
85#define CHARGERUSB_CTRL1 0x8
86
87#define CONTROLLER_STAT1 0x03
88#define VBUS_DET BIT(2)
89
90struct twl6030_usb {
91 struct phy_companion comparator;
92 struct device *dev;
93
94 /* for vbus reporting with irqs disabled */
95 spinlock_t lock;
96
97 struct regulator *usb3v3;
98
99 /* used to set vbus, in atomic path */
100 struct work_struct set_vbus_work;
101
102 int irq1;
103 int irq2;
104 enum omap_musb_vbus_id_status linkstat;
105 u8 asleep;
106 bool irq_enabled;
107 bool vbus_enable;
108 const char *regulator;
109};
110
111#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
112
113/*-------------------------------------------------------------------------*/
114
115static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
116 u8 data, u8 address)
117{
118 int ret = 0;
119
120 ret = twl_i2c_write_u8(module, data, address);
121 if (ret < 0)
122 dev_err(twl->dev,
123 "Write[0x%x] Error %d\n", address, ret);
124 return ret;
125}
126
127static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
128{
129 u8 data, ret = 0;
130
131 ret = twl_i2c_read_u8(module, &data, address);
132 if (ret >= 0)
133 ret = data;
134 else
135 dev_err(twl->dev,
136 "readb[0x%x,0x%x] Error %d\n",
137 module, address, ret);
138 return ret;
139}
140
141static int twl6030_start_srp(struct phy_companion *comparator)
142{
143 struct twl6030_usb *twl = comparator_to_twl(comparator);
144
145 twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
146 twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
147
148 mdelay(100);
149 twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
150
151 return 0;
152}
153
154static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
155{
156 /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
157 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
158
159 /* Program CFG_LDO_PD2 register and set VUSB bit */
160 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
161
162 /* Program MISC2 register and set bit VUSB_IN_VBAT */
163 twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
164
165 twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
166 if (IS_ERR(twl->usb3v3))
167 return -ENODEV;
168
169 /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
170 twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
171
172 /*
173 * Program the USB_ID_CTRL_SET register to enable GND drive
174 * and the ID comparators
175 */
176 twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
177
178 return 0;
179}
180
181static ssize_t twl6030_usb_vbus_show(struct device *dev,
182 struct device_attribute *attr, char *buf)
183{
184 struct twl6030_usb *twl = dev_get_drvdata(dev);
185 unsigned long flags;
186 int ret = -EINVAL;
187
188 spin_lock_irqsave(&twl->lock, flags);
189
190 switch (twl->linkstat) {
191 case OMAP_MUSB_VBUS_VALID:
192 ret = snprintf(buf, PAGE_SIZE, "vbus\n");
193 break;
194 case OMAP_MUSB_ID_GROUND:
195 ret = snprintf(buf, PAGE_SIZE, "id\n");
196 break;
197 case OMAP_MUSB_VBUS_OFF:
198 ret = snprintf(buf, PAGE_SIZE, "none\n");
199 break;
200 default:
201 ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
202 }
203 spin_unlock_irqrestore(&twl->lock, flags);
204
205 return ret;
206}
207static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
208
209static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
210{
211 struct twl6030_usb *twl = _twl;
212 enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
213 u8 vbus_state, hw_state;
214
215 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
216
217 vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
218 CONTROLLER_STAT1);
219 if (!(hw_state & STS_USB_ID)) {
220 if (vbus_state & VBUS_DET) {
221 regulator_enable(twl->usb3v3);
222 twl->asleep = 1;
223 status = OMAP_MUSB_VBUS_VALID;
224 twl->linkstat = status;
225 omap_musb_mailbox(status);
226 } else {
227 if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
228 status = OMAP_MUSB_VBUS_OFF;
229 twl->linkstat = status;
230 omap_musb_mailbox(status);
231 if (twl->asleep) {
232 regulator_disable(twl->usb3v3);
233 twl->asleep = 0;
234 }
235 }
236 }
237 }
238 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
239
240 return IRQ_HANDLED;
241}
242
243static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
244{
245 struct twl6030_usb *twl = _twl;
246 enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
247 u8 hw_state;
248
249 hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
250
251 if (hw_state & STS_USB_ID) {
252
253 regulator_enable(twl->usb3v3);
254 twl->asleep = 1;
255 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
256 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
257 status = OMAP_MUSB_ID_GROUND;
258 twl->linkstat = status;
259 omap_musb_mailbox(status);
260 } else {
261 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
262 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
263 }
264 twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
265
266 return IRQ_HANDLED;
267}
268
269static int twl6030_enable_irq(struct twl6030_usb *twl)
270{
271 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
272 twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
273 twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
274
275 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
276 REG_INT_MSK_LINE_C);
277 twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
278 REG_INT_MSK_STS_C);
279 twl6030_usb_irq(twl->irq2, twl);
280 twl6030_usbotg_irq(twl->irq1, twl);
281
282 return 0;
283}
284
285static void otg_set_vbus_work(struct work_struct *data)
286{
287 struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
288 set_vbus_work);
289
290 /*
291 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
292 * register. This enables boost mode.
293 */
294
295 if (twl->vbus_enable)
296 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
297 CHARGERUSB_CTRL1);
298 else
299 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
300 CHARGERUSB_CTRL1);
301}
302
303static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
304{
305 struct twl6030_usb *twl = comparator_to_twl(comparator);
306
307 twl->vbus_enable = enabled;
308 schedule_work(&twl->set_vbus_work);
309
310 return 0;
311}
312
313static int __devinit twl6030_usb_probe(struct platform_device *pdev)
314{
315 u32 ret;
316 struct twl6030_usb *twl;
317 int status, err;
318 struct device_node *np = pdev->dev.of_node;
319 struct device *dev = &pdev->dev;
320 struct twl4030_usb_data *pdata = dev->platform_data;
321
322 twl = devm_kzalloc(dev, sizeof *twl, GFP_KERNEL);
323 if (!twl)
324 return -ENOMEM;
325
326 twl->dev = &pdev->dev;
327 twl->irq1 = platform_get_irq(pdev, 0);
328 twl->irq2 = platform_get_irq(pdev, 1);
329 twl->linkstat = OMAP_MUSB_UNKNOWN;
330
331 twl->comparator.set_vbus = twl6030_set_vbus;
332 twl->comparator.start_srp = twl6030_start_srp;
333
334 ret = omap_usb2_set_comparator(&twl->comparator);
335 if (ret == -ENODEV) {
336 dev_info(&pdev->dev, "phy not ready, deferring probe");
337 return -EPROBE_DEFER;
338 }
339
340 if (np) {
341 twl->regulator = "usb";
342 } else if (pdata) {
343 if (pdata->features & TWL6025_SUBCLASS)
344 twl->regulator = "ldousb";
345 else
346 twl->regulator = "vusb";
347 } else {
348 dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
349 return -EINVAL;
350 }
351
352 /* init spinlock for workqueue */
353 spin_lock_init(&twl->lock);
354
355 err = twl6030_usb_ldo_init(twl);
356 if (err) {
357 dev_err(&pdev->dev, "ldo init failed\n");
358 return err;
359 }
360
361 platform_set_drvdata(pdev, twl);
362 if (device_create_file(&pdev->dev, &dev_attr_vbus))
363 dev_warn(&pdev->dev, "could not create sysfs file\n");
364
365 INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
366
367 twl->irq_enabled = true;
368 status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
369 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
370 "twl6030_usb", twl);
371 if (status < 0) {
372 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
373 twl->irq1, status);
374 device_remove_file(twl->dev, &dev_attr_vbus);
375 return status;
376 }
377
378 status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
379 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
380 "twl6030_usb", twl);
381 if (status < 0) {
382 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
383 twl->irq2, status);
384 free_irq(twl->irq1, twl);
385 device_remove_file(twl->dev, &dev_attr_vbus);
386 return status;
387 }
388
389 twl->asleep = 0;
390 twl6030_enable_irq(twl);
391 dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
392
393 return 0;
394}
395
396static int __exit twl6030_usb_remove(struct platform_device *pdev)
397{
398 struct twl6030_usb *twl = platform_get_drvdata(pdev);
399
400 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
401 REG_INT_MSK_LINE_C);
402 twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
403 REG_INT_MSK_STS_C);
404 free_irq(twl->irq1, twl);
405 free_irq(twl->irq2, twl);
406 regulator_put(twl->usb3v3);
407 device_remove_file(twl->dev, &dev_attr_vbus);
408 cancel_work_sync(&twl->set_vbus_work);
409
410 return 0;
411}
412
413#ifdef CONFIG_OF
414static const struct of_device_id twl6030_usb_id_table[] = {
415 { .compatible = "ti,twl6030-usb" },
416 {}
417};
418MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
419#endif
420
421static struct platform_driver twl6030_usb_driver = {
422 .probe = twl6030_usb_probe,
423 .remove = __exit_p(twl6030_usb_remove),
424 .driver = {
425 .name = "twl6030_usb",
426 .owner = THIS_MODULE,
427 .of_match_table = of_match_ptr(twl6030_usb_id_table),
428 },
429};
430
431static int __init twl6030_usb_init(void)
432{
433 return platform_driver_register(&twl6030_usb_driver);
434}
435subsys_initcall(twl6030_usb_init);
436
437static void __exit twl6030_usb_exit(void)
438{
439 platform_driver_unregister(&twl6030_usb_driver);
440}
441module_exit(twl6030_usb_exit);
442
443MODULE_ALIAS("platform:twl6030_usb");
444MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
445MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
446MODULE_LICENSE("GPL");