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

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