usb: otg: twl4030: use the global ULPI register definitions
[pandora-kernel.git] / drivers / usb / otg / twl4030-usb.c
1 /*
2  * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
3  *
4  * Copyright (C) 2004-2007 Texas Instruments
5  * Copyright (C) 2008 Nokia Corporation
6  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  * Current status:
23  *      - HS USB ULPI mode works.
24  *      - 3-pin mode support may be added in future.
25  */
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
31 #include <linux/spinlock.h>
32 #include <linux/workqueue.h>
33 #include <linux/io.h>
34 #include <linux/delay.h>
35 #include <linux/usb/otg.h>
36 #include <linux/usb/ulpi.h>
37 #include <linux/i2c/twl.h>
38 #include <linux/regulator/consumer.h>
39 #include <linux/err.h>
40 #include <linux/notifier.h>
41 #include <linux/slab.h>
42
43 /* Register defines */
44
45 #define MCPC_CTRL                       0x30
46 #define MCPC_CTRL_RTSOL                 (1 << 7)
47 #define MCPC_CTRL_EXTSWR                (1 << 6)
48 #define MCPC_CTRL_EXTSWC                (1 << 5)
49 #define MCPC_CTRL_VOICESW               (1 << 4)
50 #define MCPC_CTRL_OUT64K                (1 << 3)
51 #define MCPC_CTRL_RTSCTSSW              (1 << 2)
52 #define MCPC_CTRL_HS_UART               (1 << 0)
53
54 #define MCPC_IO_CTRL                    0x33
55 #define MCPC_IO_CTRL_MICBIASEN          (1 << 5)
56 #define MCPC_IO_CTRL_CTS_NPU            (1 << 4)
57 #define MCPC_IO_CTRL_RXD_PU             (1 << 3)
58 #define MCPC_IO_CTRL_TXDTYP             (1 << 2)
59 #define MCPC_IO_CTRL_CTSTYP             (1 << 1)
60 #define MCPC_IO_CTRL_RTSTYP             (1 << 0)
61
62 #define MCPC_CTRL2                      0x36
63 #define MCPC_CTRL2_MCPC_CK_EN           (1 << 0)
64
65 #define OTHER_FUNC_CTRL                 0x80
66 #define OTHER_FUNC_CTRL_BDIS_ACON_EN    (1 << 4)
67 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE   (1 << 2)
68
69 #define OTHER_IFC_CTRL                  0x83
70 #define OTHER_IFC_CTRL_OE_INT_EN        (1 << 6)
71 #define OTHER_IFC_CTRL_CEA2011_MODE     (1 << 5)
72 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN      (1 << 4)
73 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT       (1 << 3)
74 #define OTHER_IFC_CTRL_HIZ_ULPI         (1 << 2)
75 #define OTHER_IFC_CTRL_ALT_INT_REROUTE  (1 << 0)
76
77 #define OTHER_INT_EN_RISE               0x86
78 #define OTHER_INT_EN_FALL               0x89
79 #define OTHER_INT_STS                   0x8C
80 #define OTHER_INT_LATCH                 0x8D
81 #define OTHER_INT_VB_SESS_VLD           (1 << 7)
82 #define OTHER_INT_DM_HI                 (1 << 6) /* not valid for "latch" reg */
83 #define OTHER_INT_DP_HI                 (1 << 5) /* not valid for "latch" reg */
84 #define OTHER_INT_BDIS_ACON             (1 << 3) /* not valid for "fall" regs */
85 #define OTHER_INT_MANU                  (1 << 1)
86 #define OTHER_INT_ABNORMAL_STRESS       (1 << 0)
87
88 #define ID_STATUS                       0x96
89 #define ID_RES_FLOAT                    (1 << 4)
90 #define ID_RES_440K                     (1 << 3)
91 #define ID_RES_200K                     (1 << 2)
92 #define ID_RES_102K                     (1 << 1)
93 #define ID_RES_GND                      (1 << 0)
94
95 #define POWER_CTRL                      0xAC
96 #define POWER_CTRL_OTG_ENAB             (1 << 5)
97
98 #define OTHER_IFC_CTRL2                 0xAF
99 #define OTHER_IFC_CTRL2_ULPI_STP_LOW    (1 << 4)
100 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL   (1 << 3)
101 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430  (1 << 2)
102 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK     (3 << 0) /* bits 0 and 1 */
103 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N    (0 << 0)
104 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N    (1 << 0)
105
106 #define REG_CTRL_EN                     0xB2
107 #define REG_CTRL_ERROR                  0xB5
108 #define ULPI_I2C_CONFLICT_INTEN         (1 << 0)
109
110 #define OTHER_FUNC_CTRL2                0xB8
111 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN  (1 << 0)
112
113 /* following registers do not have separate _clr and _set registers */
114 #define VBUS_DEBOUNCE                   0xC0
115 #define ID_DEBOUNCE                     0xC1
116 #define VBAT_TIMER                      0xD3
117 #define PHY_PWR_CTRL                    0xFD
118 #define PHY_PWR_PHYPWD                  (1 << 0)
119 #define PHY_CLK_CTRL                    0xFE
120 #define PHY_CLK_CTRL_CLOCKGATING_EN     (1 << 2)
121 #define PHY_CLK_CTRL_CLK32K_EN          (1 << 1)
122 #define REQ_PHY_DPLL_CLK                (1 << 0)
123 #define PHY_CLK_CTRL_STS                0xFF
124 #define PHY_DPLL_CLK                    (1 << 0)
125
126 /* In module TWL4030_MODULE_PM_MASTER */
127 #define PROTECT_KEY                     0x0E
128 #define STS_HW_CONDITIONS               0x0F
129
130 /* In module TWL4030_MODULE_PM_RECEIVER */
131 #define VUSB_DEDICATED1                 0x7D
132 #define VUSB_DEDICATED2                 0x7E
133 #define VUSB1V5_DEV_GRP                 0x71
134 #define VUSB1V5_TYPE                    0x72
135 #define VUSB1V5_REMAP                   0x73
136 #define VUSB1V8_DEV_GRP                 0x74
137 #define VUSB1V8_TYPE                    0x75
138 #define VUSB1V8_REMAP                   0x76
139 #define VUSB3V1_DEV_GRP                 0x77
140 #define VUSB3V1_TYPE                    0x78
141 #define VUSB3V1_REMAP                   0x79
142
143 /* In module TWL4030_MODULE_INTBR */
144 #define PMBR1                           0x0D
145 #define GPIO_USB_4PIN_ULPI_2430C        (3 << 0)
146
147 struct twl4030_usb {
148         struct otg_transceiver  otg;
149         struct device           *dev;
150
151         /* TWL4030 internal USB regulator supplies */
152         struct regulator        *usb1v5;
153         struct regulator        *usb1v8;
154         struct regulator        *usb3v1;
155
156         /* for vbus reporting with irqs disabled */
157         spinlock_t              lock;
158
159         /* pin configuration */
160         enum twl4030_usb_mode   usb_mode;
161
162         int                     irq;
163         u8                      linkstat;
164         u8                      asleep;
165         bool                    irq_enabled;
166 };
167
168 /* internal define on top of container_of */
169 #define xceiv_to_twl(x)         container_of((x), struct twl4030_usb, otg);
170
171 /*-------------------------------------------------------------------------*/
172
173 static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
174                 u8 module, u8 data, u8 address)
175 {
176         u8 check;
177
178         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
179             (twl_i2c_read_u8(module, &check, address) >= 0) &&
180                                                 (check == data))
181                 return 0;
182         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
183                         1, module, address, check, data);
184
185         /* Failed once: Try again */
186         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
187             (twl_i2c_read_u8(module, &check, address) >= 0) &&
188                                                 (check == data))
189                 return 0;
190         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
191                         2, module, address, check, data);
192
193         /* Failed again: Return error */
194         return -EBUSY;
195 }
196
197 #define twl4030_usb_write_verify(twl, address, data)    \
198         twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
199
200 static inline int twl4030_usb_write(struct twl4030_usb *twl,
201                 u8 address, u8 data)
202 {
203         int ret = 0;
204
205         ret = twl_i2c_write_u8(TWL4030_MODULE_USB, data, address);
206         if (ret < 0)
207                 dev_dbg(twl->dev,
208                         "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
209         return ret;
210 }
211
212 static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
213 {
214         u8 data;
215         int ret = 0;
216
217         ret = twl_i2c_read_u8(module, &data, address);
218         if (ret >= 0)
219                 ret = data;
220         else
221                 dev_dbg(twl->dev,
222                         "TWL4030:readb[0x%x,0x%x] Error %d\n",
223                                         module, address, ret);
224
225         return ret;
226 }
227
228 static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
229 {
230         return twl4030_readb(twl, TWL4030_MODULE_USB, address);
231 }
232
233 /*-------------------------------------------------------------------------*/
234
235 static inline int
236 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
237 {
238         return twl4030_usb_write(twl, ULPI_SET(reg), bits);
239 }
240
241 static inline int
242 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
243 {
244         return twl4030_usb_write(twl, ULPI_CLR(reg), bits);
245 }
246
247 /*-------------------------------------------------------------------------*/
248
249 static enum usb_xceiv_events twl4030_usb_linkstat(struct twl4030_usb *twl)
250 {
251         int     status;
252         int     linkstat = USB_EVENT_NONE;
253
254         /*
255          * For ID/VBUS sensing, see manual section 15.4.8 ...
256          * except when using only battery backup power, two
257          * comparators produce VBUS_PRES and ID_PRES signals,
258          * which don't match docs elsewhere.  But ... BIT(7)
259          * and BIT(2) of STS_HW_CONDITIONS, respectively, do
260          * seem to match up.  If either is true the USB_PRES
261          * signal is active, the OTG module is activated, and
262          * its interrupt may be raised (may wake the system).
263          */
264         status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER,
265                         STS_HW_CONDITIONS);
266         if (status < 0)
267                 dev_err(twl->dev, "USB link status err %d\n", status);
268         else if (status & (BIT(7) | BIT(2))) {
269                 if (status & BIT(2))
270                         linkstat = USB_EVENT_ID;
271                 else
272                         linkstat = USB_EVENT_VBUS;
273         } else
274                 linkstat = USB_EVENT_NONE;
275
276         dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
277                         status, status, linkstat);
278
279         /* REVISIT this assumes host and peripheral controllers
280          * are registered, and that both are active...
281          */
282
283         spin_lock_irq(&twl->lock);
284         twl->linkstat = linkstat;
285         if (linkstat == USB_EVENT_ID) {
286                 twl->otg.default_a = true;
287                 twl->otg.state = OTG_STATE_A_IDLE;
288         } else {
289                 twl->otg.default_a = false;
290                 twl->otg.state = OTG_STATE_B_IDLE;
291         }
292         spin_unlock_irq(&twl->lock);
293
294         return linkstat;
295 }
296
297 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
298 {
299         twl->usb_mode = mode;
300
301         switch (mode) {
302         case T2_USB_MODE_ULPI:
303                 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
304                                         ULPI_IFC_CTRL_CARKITMODE);
305                 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
306                 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
307                                         ULPI_FUNC_CTRL_XCVRSEL_MASK |
308                                         ULPI_FUNC_CTRL_OPMODE_MASK);
309                 break;
310         case -1:
311                 /* FIXME: power on defaults */
312                 break;
313         default:
314                 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
315                                 mode);
316                 break;
317         };
318 }
319
320 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
321 {
322         unsigned long timeout;
323         int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
324
325         if (val >= 0) {
326                 if (on) {
327                         /* enable DPLL to access PHY registers over I2C */
328                         val |= REQ_PHY_DPLL_CLK;
329                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
330                                                 (u8)val) < 0);
331
332                         timeout = jiffies + HZ;
333                         while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
334                                                         PHY_DPLL_CLK)
335                                 && time_before(jiffies, timeout))
336                                         udelay(10);
337                         if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
338                                                         PHY_DPLL_CLK))
339                                 dev_err(twl->dev, "Timeout setting T2 HSUSB "
340                                                 "PHY DPLL clock\n");
341                 } else {
342                         /* let ULPI control the DPLL clock */
343                         val &= ~REQ_PHY_DPLL_CLK;
344                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
345                                                 (u8)val) < 0);
346                 }
347         }
348 }
349
350 static void twl4030_phy_power(struct twl4030_usb *twl, int on)
351 {
352         u8 pwr;
353
354         pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
355         if (on) {
356                 regulator_enable(twl->usb3v1);
357                 regulator_enable(twl->usb1v8);
358                 /*
359                  * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
360                  * in twl4030) resets the VUSB_DEDICATED2 register. This reset
361                  * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
362                  * SLEEP. We work around this by clearing the bit after usv3v1
363                  * is re-activated. This ensures that VUSB3V1 is really active.
364                  */
365                 twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
366                                                         VUSB_DEDICATED2);
367                 regulator_enable(twl->usb1v5);
368                 pwr &= ~PHY_PWR_PHYPWD;
369                 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
370                 twl4030_usb_write(twl, PHY_CLK_CTRL,
371                                   twl4030_usb_read(twl, PHY_CLK_CTRL) |
372                                         (PHY_CLK_CTRL_CLOCKGATING_EN |
373                                                 PHY_CLK_CTRL_CLK32K_EN));
374         } else  {
375                 pwr |= PHY_PWR_PHYPWD;
376                 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
377                 regulator_disable(twl->usb1v5);
378                 regulator_disable(twl->usb1v8);
379                 regulator_disable(twl->usb3v1);
380         }
381 }
382
383 static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
384 {
385         if (twl->asleep)
386                 return;
387
388         twl4030_phy_power(twl, 0);
389         twl->asleep = 1;
390 }
391
392 static void twl4030_phy_resume(struct twl4030_usb *twl)
393 {
394         if (!twl->asleep)
395                 return;
396
397         twl4030_phy_power(twl, 1);
398         twl4030_i2c_access(twl, 1);
399         twl4030_usb_set_mode(twl, twl->usb_mode);
400         if (twl->usb_mode == T2_USB_MODE_ULPI)
401                 twl4030_i2c_access(twl, 0);
402         twl->asleep = 0;
403 }
404
405 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
406 {
407         /* Enable writing to power configuration registers */
408         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
409         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY);
410
411         /* put VUSB3V1 LDO in active state */
412         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
413
414         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
415         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
416
417         /* Initialize 3.1V regulator */
418         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
419
420         twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
421         if (IS_ERR(twl->usb3v1))
422                 return -ENODEV;
423
424         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
425
426         /* Initialize 1.5V regulator */
427         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
428
429         twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
430         if (IS_ERR(twl->usb1v5))
431                 goto fail1;
432
433         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
434
435         /* Initialize 1.8V regulator */
436         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
437
438         twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
439         if (IS_ERR(twl->usb1v8))
440                 goto fail2;
441
442         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
443
444         /* disable access to power configuration registers */
445         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
446
447         return 0;
448
449 fail2:
450         regulator_put(twl->usb1v5);
451         twl->usb1v5 = NULL;
452 fail1:
453         regulator_put(twl->usb3v1);
454         twl->usb3v1 = NULL;
455         return -ENODEV;
456 }
457
458 static ssize_t twl4030_usb_vbus_show(struct device *dev,
459                 struct device_attribute *attr, char *buf)
460 {
461         struct twl4030_usb *twl = dev_get_drvdata(dev);
462         unsigned long flags;
463         int ret = -EINVAL;
464
465         spin_lock_irqsave(&twl->lock, flags);
466         ret = sprintf(buf, "%s\n",
467                         (twl->linkstat == USB_EVENT_VBUS) ? "on" : "off");
468         spin_unlock_irqrestore(&twl->lock, flags);
469
470         return ret;
471 }
472 static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
473
474 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
475 {
476         struct twl4030_usb *twl = _twl;
477         int status;
478
479         status = twl4030_usb_linkstat(twl);
480         if (status >= 0) {
481                 /* FIXME add a set_power() method so that B-devices can
482                  * configure the charger appropriately.  It's not always
483                  * correct to consume VBUS power, and how much current to
484                  * consume is a function of the USB configuration chosen
485                  * by the host.
486                  *
487                  * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
488                  * its disconnect() sibling, when changing to/from the
489                  * USB_LINK_VBUS state.  musb_hdrc won't care until it
490                  * starts to handle softconnect right.
491                  */
492                 if (status == USB_EVENT_NONE)
493                         twl4030_phy_suspend(twl, 0);
494                 else
495                         twl4030_phy_resume(twl);
496
497                 blocking_notifier_call_chain(&twl->otg.notifier, status,
498                                 twl->otg.gadget);
499         }
500         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
501
502         return IRQ_HANDLED;
503 }
504
505 static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
506 {
507         struct twl4030_usb *twl = xceiv_to_twl(x);
508
509         if (suspend)
510                 twl4030_phy_suspend(twl, 1);
511         else
512                 twl4030_phy_resume(twl);
513
514         return 0;
515 }
516
517 static int twl4030_set_peripheral(struct otg_transceiver *x,
518                 struct usb_gadget *gadget)
519 {
520         struct twl4030_usb *twl;
521
522         if (!x)
523                 return -ENODEV;
524
525         twl = xceiv_to_twl(x);
526         twl->otg.gadget = gadget;
527         if (!gadget)
528                 twl->otg.state = OTG_STATE_UNDEFINED;
529
530         return 0;
531 }
532
533 static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
534 {
535         struct twl4030_usb *twl;
536
537         if (!x)
538                 return -ENODEV;
539
540         twl = xceiv_to_twl(x);
541         twl->otg.host = host;
542         if (!host)
543                 twl->otg.state = OTG_STATE_UNDEFINED;
544
545         return 0;
546 }
547
548 static int __devinit twl4030_usb_probe(struct platform_device *pdev)
549 {
550         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
551         struct twl4030_usb      *twl;
552         int                     status, err;
553
554         if (!pdata) {
555                 dev_dbg(&pdev->dev, "platform_data not available\n");
556                 return -EINVAL;
557         }
558
559         twl = kzalloc(sizeof *twl, GFP_KERNEL);
560         if (!twl)
561                 return -ENOMEM;
562
563         twl->dev                = &pdev->dev;
564         twl->irq                = platform_get_irq(pdev, 0);
565         twl->otg.dev            = twl->dev;
566         twl->otg.label          = "twl4030";
567         twl->otg.set_host       = twl4030_set_host;
568         twl->otg.set_peripheral = twl4030_set_peripheral;
569         twl->otg.set_suspend    = twl4030_set_suspend;
570         twl->usb_mode           = pdata->usb_mode;
571         twl->asleep             = 1;
572
573         /* init spinlock for workqueue */
574         spin_lock_init(&twl->lock);
575
576         err = twl4030_usb_ldo_init(twl);
577         if (err) {
578                 dev_err(&pdev->dev, "ldo init failed\n");
579                 kfree(twl);
580                 return err;
581         }
582         otg_set_transceiver(&twl->otg);
583
584         platform_set_drvdata(pdev, twl);
585         if (device_create_file(&pdev->dev, &dev_attr_vbus))
586                 dev_warn(&pdev->dev, "could not create sysfs file\n");
587
588         BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
589
590         /* Our job is to use irqs and status from the power module
591          * to keep the transceiver disabled when nothing's connected.
592          *
593          * FIXME we actually shouldn't start enabling it until the
594          * USB controller drivers have said they're ready, by calling
595          * set_host() and/or set_peripheral() ... OTG_capable boards
596          * need both handles, otherwise just one suffices.
597          */
598         twl->irq_enabled = true;
599         status = request_threaded_irq(twl->irq, NULL, twl4030_usb_irq,
600                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
601                         "twl4030_usb", twl);
602         if (status < 0) {
603                 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
604                         twl->irq, status);
605                 kfree(twl);
606                 return status;
607         }
608
609         /* The IRQ handler just handles changes from the previous states
610          * of the ID and VBUS pins ... in probe() we must initialize that
611          * previous state.  The easy way:  fake an IRQ.
612          *
613          * REVISIT:  a real IRQ might have happened already, if PREEMPT is
614          * enabled.  Else the IRQ may not yet be configured or enabled,
615          * because of scheduling delays.
616          */
617         twl4030_usb_irq(twl->irq, twl);
618
619         dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
620         return 0;
621 }
622
623 static int __exit twl4030_usb_remove(struct platform_device *pdev)
624 {
625         struct twl4030_usb *twl = platform_get_drvdata(pdev);
626         int val;
627
628         free_irq(twl->irq, twl);
629         device_remove_file(twl->dev, &dev_attr_vbus);
630
631         /* set transceiver mode to power on defaults */
632         twl4030_usb_set_mode(twl, -1);
633
634         /* autogate 60MHz ULPI clock,
635          * clear dpll clock request for i2c access,
636          * disable 32KHz
637          */
638         val = twl4030_usb_read(twl, PHY_CLK_CTRL);
639         if (val >= 0) {
640                 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
641                 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
642                 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
643         }
644
645         /* disable complete OTG block */
646         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
647
648         twl4030_phy_power(twl, 0);
649         regulator_put(twl->usb1v5);
650         regulator_put(twl->usb1v8);
651         regulator_put(twl->usb3v1);
652
653         kfree(twl);
654
655         return 0;
656 }
657
658 static struct platform_driver twl4030_usb_driver = {
659         .probe          = twl4030_usb_probe,
660         .remove         = __exit_p(twl4030_usb_remove),
661         .driver         = {
662                 .name   = "twl4030_usb",
663                 .owner  = THIS_MODULE,
664         },
665 };
666
667 static int __init twl4030_usb_init(void)
668 {
669         return platform_driver_register(&twl4030_usb_driver);
670 }
671 subsys_initcall(twl4030_usb_init);
672
673 static void __exit twl4030_usb_exit(void)
674 {
675         platform_driver_unregister(&twl4030_usb_driver);
676 }
677 module_exit(twl4030_usb_exit);
678
679 MODULE_ALIAS("platform:twl4030_usb");
680 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
681 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
682 MODULE_LICENSE("GPL");