Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/usb/phy/phy-twl6030-usb.c

  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 #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 set vbus, in atomic path */
101         struct work_struct      set_vbus_work;
102 
103         int                     irq1;
104         int                     irq2;
105         enum omap_musb_vbus_id_status linkstat;
106         u8                      asleep;
107         bool                    irq_enabled;
108         bool                    vbus_enable;
109         const char              *regulator;
110 };
111 
112 #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
113 
114 /*-------------------------------------------------------------------------*/
115 
116 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
117                                                 u8 data, u8 address)
118 {
119         int ret = 0;
120 
121         ret = twl_i2c_write_u8(module, data, address);
122         if (ret < 0)
123                 dev_err(twl->dev,
124                         "Write[0x%x] Error %d\n", address, ret);
125         return ret;
126 }
127 
128 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
129 {
130         u8 data;
131         int ret;
132 
133         ret = twl_i2c_read_u8(module, &data, address);
134         if (ret >= 0)
135                 ret = data;
136         else
137                 dev_err(twl->dev,
138                         "readb[0x%x,0x%x] Error %d\n",
139                                         module, address, ret);
140         return ret;
141 }
142 
143 static int twl6030_start_srp(struct phy_companion *comparator)
144 {
145         struct twl6030_usb *twl = comparator_to_twl(comparator);
146 
147         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
148         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
149 
150         mdelay(100);
151         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
152 
153         return 0;
154 }
155 
156 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
157 {
158         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
159         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
160 
161         /* Program CFG_LDO_PD2 register and set VUSB bit */
162         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
163 
164         /* Program MISC2 register and set bit VUSB_IN_VBAT */
165         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
166 
167         twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
168         if (IS_ERR(twl->usb3v3))
169                 return -ENODEV;
170 
171         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
172         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
173 
174         /*
175          * Program the USB_ID_CTRL_SET register to enable GND drive
176          * and the ID comparators
177          */
178         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
179 
180         return 0;
181 }
182 
183 static ssize_t twl6030_usb_vbus_show(struct device *dev,
184                         struct device_attribute *attr, char *buf)
185 {
186         struct twl6030_usb *twl = dev_get_drvdata(dev);
187         unsigned long flags;
188         int ret = -EINVAL;
189 
190         spin_lock_irqsave(&twl->lock, flags);
191 
192         switch (twl->linkstat) {
193         case OMAP_MUSB_VBUS_VALID:
194                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
195                break;
196         case OMAP_MUSB_ID_GROUND:
197                ret = snprintf(buf, PAGE_SIZE, "id\n");
198                break;
199         case OMAP_MUSB_VBUS_OFF:
200                ret = snprintf(buf, PAGE_SIZE, "none\n");
201                break;
202         default:
203                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
204         }
205         spin_unlock_irqrestore(&twl->lock, flags);
206 
207         return ret;
208 }
209 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
210 
211 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
212 {
213         struct twl6030_usb *twl = _twl;
214         enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
215         u8 vbus_state, hw_state;
216         int ret;
217 
218         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
219 
220         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
221                                                 CONTROLLER_STAT1);
222         if (!(hw_state & STS_USB_ID)) {
223                 if (vbus_state & VBUS_DET) {
224                         ret = regulator_enable(twl->usb3v3);
225                         if (ret)
226                                 dev_err(twl->dev, "Failed to enable usb3v3\n");
227 
228                         twl->asleep = 1;
229                         status = OMAP_MUSB_VBUS_VALID;
230                         twl->linkstat = status;
231                         omap_musb_mailbox(status);
232                 } else {
233                         if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
234                                 status = OMAP_MUSB_VBUS_OFF;
235                                 twl->linkstat = status;
236                                 omap_musb_mailbox(status);
237                                 if (twl->asleep) {
238                                         regulator_disable(twl->usb3v3);
239                                         twl->asleep = 0;
240                                 }
241                         }
242                 }
243         }
244         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
245 
246         return IRQ_HANDLED;
247 }
248 
249 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
250 {
251         struct twl6030_usb *twl = _twl;
252         enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
253         u8 hw_state;
254         int ret;
255 
256         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
257 
258         if (hw_state & STS_USB_ID) {
259                 ret = regulator_enable(twl->usb3v3);
260                 if (ret)
261                         dev_err(twl->dev, "Failed to enable usb3v3\n");
262 
263                 twl->asleep = 1;
264                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
265                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
266                 status = OMAP_MUSB_ID_GROUND;
267                 twl->linkstat = status;
268                 omap_musb_mailbox(status);
269         } else  {
270                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
271                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
272         }
273         twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
274 
275         return IRQ_HANDLED;
276 }
277 
278 static int twl6030_enable_irq(struct twl6030_usb *twl)
279 {
280         twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
281         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
282         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
283 
284         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
285                                 REG_INT_MSK_LINE_C);
286         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
287                                 REG_INT_MSK_STS_C);
288         twl6030_usb_irq(twl->irq2, twl);
289         twl6030_usbotg_irq(twl->irq1, twl);
290 
291         return 0;
292 }
293 
294 static void otg_set_vbus_work(struct work_struct *data)
295 {
296         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
297                                                                 set_vbus_work);
298 
299         /*
300          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
301          * register. This enables boost mode.
302          */
303 
304         if (twl->vbus_enable)
305                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
306                                                         CHARGERUSB_CTRL1);
307         else
308                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
309                                                         CHARGERUSB_CTRL1);
310 }
311 
312 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
313 {
314         struct twl6030_usb *twl = comparator_to_twl(comparator);
315 
316         twl->vbus_enable = enabled;
317         schedule_work(&twl->set_vbus_work);
318 
319         return 0;
320 }
321 
322 static int twl6030_usb_probe(struct platform_device *pdev)
323 {
324         u32 ret;
325         struct twl6030_usb      *twl;
326         int                     status, err;
327         struct device_node      *np = pdev->dev.of_node;
328         struct device           *dev = &pdev->dev;
329         struct twl4030_usb_data *pdata = dev_get_platdata(dev);
330 
331         twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
332         if (!twl)
333                 return -ENOMEM;
334 
335         twl->dev                = &pdev->dev;
336         twl->irq1               = platform_get_irq(pdev, 0);
337         twl->irq2               = platform_get_irq(pdev, 1);
338         twl->linkstat           = OMAP_MUSB_UNKNOWN;
339 
340         twl->comparator.set_vbus        = twl6030_set_vbus;
341         twl->comparator.start_srp       = twl6030_start_srp;
342 
343         ret = omap_usb2_set_comparator(&twl->comparator);
344         if (ret == -ENODEV) {
345                 dev_info(&pdev->dev, "phy not ready, deferring probe");
346                 return -EPROBE_DEFER;
347         }
348 
349         if (np) {
350                 twl->regulator = "usb";
351         } else if (pdata) {
352                 if (pdata->features & TWL6032_SUBCLASS)
353                         twl->regulator = "ldousb";
354                 else
355                         twl->regulator = "vusb";
356         } else {
357                 dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
358                 return -EINVAL;
359         }
360 
361         /* init spinlock for workqueue */
362         spin_lock_init(&twl->lock);
363 
364         err = twl6030_usb_ldo_init(twl);
365         if (err) {
366                 dev_err(&pdev->dev, "ldo init failed\n");
367                 return err;
368         }
369 
370         platform_set_drvdata(pdev, twl);
371         if (device_create_file(&pdev->dev, &dev_attr_vbus))
372                 dev_warn(&pdev->dev, "could not create sysfs file\n");
373 
374         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
375 
376         twl->irq_enabled = true;
377         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
378                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
379                         "twl6030_usb", twl);
380         if (status < 0) {
381                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
382                         twl->irq1, status);
383                 device_remove_file(twl->dev, &dev_attr_vbus);
384                 return status;
385         }
386 
387         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
388                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
389                         "twl6030_usb", twl);
390         if (status < 0) {
391                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
392                         twl->irq2, status);
393                 free_irq(twl->irq1, twl);
394                 device_remove_file(twl->dev, &dev_attr_vbus);
395                 return status;
396         }
397 
398         twl->asleep = 0;
399         twl6030_enable_irq(twl);
400         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
401 
402         return 0;
403 }
404 
405 static int twl6030_usb_remove(struct platform_device *pdev)
406 {
407         struct twl6030_usb *twl = platform_get_drvdata(pdev);
408 
409         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
410                 REG_INT_MSK_LINE_C);
411         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
412                         REG_INT_MSK_STS_C);
413         free_irq(twl->irq1, twl);
414         free_irq(twl->irq2, twl);
415         regulator_put(twl->usb3v3);
416         device_remove_file(twl->dev, &dev_attr_vbus);
417         cancel_work_sync(&twl->set_vbus_work);
418 
419         return 0;
420 }
421 
422 #ifdef CONFIG_OF
423 static const struct of_device_id twl6030_usb_id_table[] = {
424         { .compatible = "ti,twl6030-usb" },
425         {}
426 };
427 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
428 #endif
429 
430 static struct platform_driver twl6030_usb_driver = {
431         .probe          = twl6030_usb_probe,
432         .remove         = twl6030_usb_remove,
433         .driver         = {
434                 .name   = "twl6030_usb",
435                 .owner  = THIS_MODULE,
436                 .of_match_table = of_match_ptr(twl6030_usb_id_table),
437         },
438 };
439 
440 static int __init twl6030_usb_init(void)
441 {
442         return platform_driver_register(&twl6030_usb_driver);
443 }
444 subsys_initcall(twl6030_usb_init);
445 
446 static void __exit twl6030_usb_exit(void)
447 {
448         platform_driver_unregister(&twl6030_usb_driver);
449 }
450 module_exit(twl6030_usb_exit);
451 
452 MODULE_ALIAS("platform:twl6030_usb");
453 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
454 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
455 MODULE_LICENSE("GPL");
456 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us