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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.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         const char              *regulator;
112 };
113 
114 #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
115 
116 /*-------------------------------------------------------------------------*/
117 
118 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
119                                                 u8 data, u8 address)
120 {
121         int ret = 0;
122 
123         ret = twl_i2c_write_u8(module, data, address);
124         if (ret < 0)
125                 dev_err(twl->dev,
126                         "Write[0x%x] Error %d\n", address, ret);
127         return ret;
128 }
129 
130 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
131 {
132         u8 data;
133         int ret;
134 
135         ret = twl_i2c_read_u8(module, &data, address);
136         if (ret >= 0)
137                 ret = data;
138         else
139                 dev_err(twl->dev,
140                         "readb[0x%x,0x%x] Error %d\n",
141                                         module, address, ret);
142         return ret;
143 }
144 
145 static int twl6030_start_srp(struct phy_companion *comparator)
146 {
147         struct twl6030_usb *twl = comparator_to_twl(comparator);
148 
149         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
150         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
151 
152         mdelay(100);
153         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
154 
155         return 0;
156 }
157 
158 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
159 {
160         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
161         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
162 
163         /* Program CFG_LDO_PD2 register and set VUSB bit */
164         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
165 
166         /* Program MISC2 register and set bit VUSB_IN_VBAT */
167         twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
168 
169         twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
170         if (IS_ERR(twl->usb3v3))
171                 return -ENODEV;
172 
173         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
174         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
175 
176         /*
177          * Program the USB_ID_CTRL_SET register to enable GND drive
178          * and the ID comparators
179          */
180         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
181 
182         return 0;
183 }
184 
185 static ssize_t twl6030_usb_vbus_show(struct device *dev,
186                         struct device_attribute *attr, char *buf)
187 {
188         struct twl6030_usb *twl = dev_get_drvdata(dev);
189         unsigned long flags;
190         int ret = -EINVAL;
191 
192         spin_lock_irqsave(&twl->lock, flags);
193 
194         switch (twl->linkstat) {
195         case MUSB_VBUS_VALID:
196                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
197                break;
198         case MUSB_ID_GROUND:
199                ret = snprintf(buf, PAGE_SIZE, "id\n");
200                break;
201         case MUSB_VBUS_OFF:
202                ret = snprintf(buf, PAGE_SIZE, "none\n");
203                break;
204         default:
205                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
206         }
207         spin_unlock_irqrestore(&twl->lock, flags);
208 
209         return ret;
210 }
211 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
212 
213 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
214 {
215         struct twl6030_usb *twl = _twl;
216         enum musb_vbus_id_status status = MUSB_UNKNOWN;
217         u8 vbus_state, hw_state;
218         int ret;
219 
220         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
221 
222         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
223                                                 CONTROLLER_STAT1);
224         if (!(hw_state & STS_USB_ID)) {
225                 if (vbus_state & VBUS_DET) {
226                         ret = regulator_enable(twl->usb3v3);
227                         if (ret)
228                                 dev_err(twl->dev, "Failed to enable usb3v3\n");
229 
230                         twl->asleep = 1;
231                         status = MUSB_VBUS_VALID;
232                         twl->linkstat = status;
233                         ret = musb_mailbox(status);
234                         if (ret)
235                                 twl->linkstat = MUSB_UNKNOWN;
236                 } else {
237                         if (twl->linkstat != MUSB_UNKNOWN) {
238                                 status = MUSB_VBUS_OFF;
239                                 twl->linkstat = status;
240                                 ret = musb_mailbox(status);
241                                 if (ret)
242                                         twl->linkstat = MUSB_UNKNOWN;
243                                 if (twl->asleep) {
244                                         regulator_disable(twl->usb3v3);
245                                         twl->asleep = 0;
246                                 }
247                         }
248                 }
249         }
250         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
251 
252         return IRQ_HANDLED;
253 }
254 
255 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
256 {
257         struct twl6030_usb *twl = _twl;
258         enum musb_vbus_id_status status = MUSB_UNKNOWN;
259         u8 hw_state;
260         int ret;
261 
262         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
263 
264         if (hw_state & STS_USB_ID) {
265                 ret = regulator_enable(twl->usb3v3);
266                 if (ret)
267                         dev_err(twl->dev, "Failed to enable usb3v3\n");
268 
269                 twl->asleep = 1;
270                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
271                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
272                 status = MUSB_ID_GROUND;
273                 twl->linkstat = status;
274                 ret = musb_mailbox(status);
275                 if (ret)
276                         twl->linkstat = MUSB_UNKNOWN;
277         } else  {
278                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
279                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
280         }
281         twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
282 
283         return IRQ_HANDLED;
284 }
285 
286 static void twl6030_status_work(struct work_struct *work)
287 {
288         struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
289                                                get_status_work.work);
290 
291         twl6030_usb_irq(twl->irq2, twl);
292         twl6030_usbotg_irq(twl->irq1, twl);
293 }
294 
295 static int twl6030_enable_irq(struct twl6030_usb *twl)
296 {
297         twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
298         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
299         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
300 
301         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
302                                 REG_INT_MSK_LINE_C);
303         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
304                                 REG_INT_MSK_STS_C);
305 
306         return 0;
307 }
308 
309 static void otg_set_vbus_work(struct work_struct *data)
310 {
311         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
312                                                                 set_vbus_work);
313 
314         /*
315          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
316          * register. This enables boost mode.
317          */
318 
319         if (twl->vbus_enable)
320                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
321                                                         CHARGERUSB_CTRL1);
322         else
323                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
324                                                         CHARGERUSB_CTRL1);
325 }
326 
327 static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
328 {
329         struct twl6030_usb *twl = comparator_to_twl(comparator);
330 
331         twl->vbus_enable = enabled;
332         schedule_work(&twl->set_vbus_work);
333 
334         return 0;
335 }
336 
337 static int twl6030_usb_probe(struct platform_device *pdev)
338 {
339         u32 ret;
340         struct twl6030_usb      *twl;
341         int                     status, err;
342         struct device_node      *np = pdev->dev.of_node;
343         struct device           *dev = &pdev->dev;
344         struct twl4030_usb_data *pdata = dev_get_platdata(dev);
345 
346         twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
347         if (!twl)
348                 return -ENOMEM;
349 
350         twl->dev                = &pdev->dev;
351         twl->irq1               = platform_get_irq(pdev, 0);
352         twl->irq2               = platform_get_irq(pdev, 1);
353         twl->linkstat           = MUSB_UNKNOWN;
354 
355         twl->comparator.set_vbus        = twl6030_set_vbus;
356         twl->comparator.start_srp       = twl6030_start_srp;
357 
358         ret = omap_usb2_set_comparator(&twl->comparator);
359         if (ret == -ENODEV) {
360                 dev_info(&pdev->dev, "phy not ready, deferring probe");
361                 return -EPROBE_DEFER;
362         }
363 
364         if (np) {
365                 twl->regulator = "usb";
366         } else if (pdata) {
367                 if (pdata->features & TWL6032_SUBCLASS)
368                         twl->regulator = "ldousb";
369                 else
370                         twl->regulator = "vusb";
371         } else {
372                 dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
373                 return -EINVAL;
374         }
375 
376         /* init spinlock for workqueue */
377         spin_lock_init(&twl->lock);
378 
379         err = twl6030_usb_ldo_init(twl);
380         if (err) {
381                 dev_err(&pdev->dev, "ldo init failed\n");
382                 return err;
383         }
384 
385         platform_set_drvdata(pdev, twl);
386         if (device_create_file(&pdev->dev, &dev_attr_vbus))
387                 dev_warn(&pdev->dev, "could not create sysfs file\n");
388 
389         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
390         INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
391 
392         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
393                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
394                         "twl6030_usb", twl);
395         if (status < 0) {
396                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
397                         twl->irq1, status);
398                 device_remove_file(twl->dev, &dev_attr_vbus);
399                 return status;
400         }
401 
402         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
403                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
404                         "twl6030_usb", twl);
405         if (status < 0) {
406                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
407                         twl->irq2, status);
408                 free_irq(twl->irq1, twl);
409                 device_remove_file(twl->dev, &dev_attr_vbus);
410                 return status;
411         }
412 
413         twl->asleep = 0;
414         twl6030_enable_irq(twl);
415         schedule_delayed_work(&twl->get_status_work, HZ);
416         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
417 
418         return 0;
419 }
420 
421 static int twl6030_usb_remove(struct platform_device *pdev)
422 {
423         struct twl6030_usb *twl = platform_get_drvdata(pdev);
424 
425         cancel_delayed_work(&twl->get_status_work);
426         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
427                 REG_INT_MSK_LINE_C);
428         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
429                         REG_INT_MSK_STS_C);
430         free_irq(twl->irq1, twl);
431         free_irq(twl->irq2, twl);
432         regulator_put(twl->usb3v3);
433         device_remove_file(twl->dev, &dev_attr_vbus);
434         cancel_work_sync(&twl->set_vbus_work);
435 
436         return 0;
437 }
438 
439 #ifdef CONFIG_OF
440 static const struct of_device_id twl6030_usb_id_table[] = {
441         { .compatible = "ti,twl6030-usb" },
442         {}
443 };
444 MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
445 #endif
446 
447 static struct platform_driver twl6030_usb_driver = {
448         .probe          = twl6030_usb_probe,
449         .remove         = twl6030_usb_remove,
450         .driver         = {
451                 .name   = "twl6030_usb",
452                 .of_match_table = of_match_ptr(twl6030_usb_id_table),
453         },
454 };
455 
456 static int __init twl6030_usb_init(void)
457 {
458         return platform_driver_register(&twl6030_usb_driver);
459 }
460 subsys_initcall(twl6030_usb_init);
461 
462 static void __exit twl6030_usb_exit(void)
463 {
464         platform_driver_unregister(&twl6030_usb_driver);
465 }
466 module_exit(twl6030_usb_exit);
467 
468 MODULE_ALIAS("platform:twl6030_usb");
469 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
470 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
471 MODULE_LICENSE("GPL");
472 

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