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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 };
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 

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