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USB: otg: twl4030 transceiver driver
[linux.git] / drivers / usb / otg / twl4030-usb.c
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9ebd9616
DB		 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 <[email protected]>
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/i2c/twl4030.h>
37
38
39/* Register defines */
40
41#define VENDOR_ID_LO 0x00
42#define VENDOR_ID_HI 0x01
43#define PRODUCT_ID_LO 0x02
44#define PRODUCT_ID_HI 0x03
45
46#define FUNC_CTRL 0x04
47#define FUNC_CTRL_SET 0x05
48#define FUNC_CTRL_CLR 0x06
49#define FUNC_CTRL_SUSPENDM (1 << 6)
50#define FUNC_CTRL_RESET (1 << 5)
51#define FUNC_CTRL_OPMODE_MASK (3 << 3) /* bits 3 and 4 */
52#define FUNC_CTRL_OPMODE_NORMAL (0 << 3)
53#define FUNC_CTRL_OPMODE_NONDRIVING (1 << 3)
54#define FUNC_CTRL_OPMODE_DISABLE_BIT_NRZI (2 << 3)
55#define FUNC_CTRL_TERMSELECT (1 << 2)
56#define FUNC_CTRL_XCVRSELECT_MASK (3 << 0) /* bits 0 and 1 */
57#define FUNC_CTRL_XCVRSELECT_HS (0 << 0)
58#define FUNC_CTRL_XCVRSELECT_FS (1 << 0)
59#define FUNC_CTRL_XCVRSELECT_LS (2 << 0)
60#define FUNC_CTRL_XCVRSELECT_FS4LS (3 << 0)
61
62#define IFC_CTRL 0x07
63#define IFC_CTRL_SET 0x08
64#define IFC_CTRL_CLR 0x09
65#define IFC_CTRL_INTERFACE_PROTECT_DISABLE (1 << 7)
66#define IFC_CTRL_AUTORESUME (1 << 4)
67#define IFC_CTRL_CLOCKSUSPENDM (1 << 3)
68#define IFC_CTRL_CARKITMODE (1 << 2)
69#define IFC_CTRL_FSLSSERIALMODE_3PIN (1 << 1)
70
71#define TWL4030_OTG_CTRL 0x0A
72#define TWL4030_OTG_CTRL_SET 0x0B
73#define TWL4030_OTG_CTRL_CLR 0x0C
74#define TWL4030_OTG_CTRL_DRVVBUS (1 << 5)
75#define TWL4030_OTG_CTRL_CHRGVBUS (1 << 4)
76#define TWL4030_OTG_CTRL_DISCHRGVBUS (1 << 3)
77#define TWL4030_OTG_CTRL_DMPULLDOWN (1 << 2)
78#define TWL4030_OTG_CTRL_DPPULLDOWN (1 << 1)
79#define TWL4030_OTG_CTRL_IDPULLUP (1 << 0)
80
81#define USB_INT_EN_RISE 0x0D
82#define USB_INT_EN_RISE_SET 0x0E
83#define USB_INT_EN_RISE_CLR 0x0F
84#define USB_INT_EN_FALL 0x10
85#define USB_INT_EN_FALL_SET 0x11
86#define USB_INT_EN_FALL_CLR 0x12
87#define USB_INT_STS 0x13
88#define USB_INT_LATCH 0x14
89#define USB_INT_IDGND (1 << 4)
90#define USB_INT_SESSEND (1 << 3)
91#define USB_INT_SESSVALID (1 << 2)
92#define USB_INT_VBUSVALID (1 << 1)
93#define USB_INT_HOSTDISCONNECT (1 << 0)
94
95#define CARKIT_CTRL 0x19
96#define CARKIT_CTRL_SET 0x1A
97#define CARKIT_CTRL_CLR 0x1B
98#define CARKIT_CTRL_MICEN (1 << 6)
99#define CARKIT_CTRL_SPKRIGHTEN (1 << 5)
100#define CARKIT_CTRL_SPKLEFTEN (1 << 4)
101#define CARKIT_CTRL_RXDEN (1 << 3)
102#define CARKIT_CTRL_TXDEN (1 << 2)
103#define CARKIT_CTRL_IDGNDDRV (1 << 1)
104#define CARKIT_CTRL_CARKITPWR (1 << 0)
105#define CARKIT_PLS_CTRL 0x22
106#define CARKIT_PLS_CTRL_SET 0x23
107#define CARKIT_PLS_CTRL_CLR 0x24
108#define CARKIT_PLS_CTRL_SPKRRIGHT_BIASEN (1 << 3)
109#define CARKIT_PLS_CTRL_SPKRLEFT_BIASEN (1 << 2)
110#define CARKIT_PLS_CTRL_RXPLSEN (1 << 1)
111#define CARKIT_PLS_CTRL_TXPLSEN (1 << 0)
112
113#define MCPC_CTRL 0x30
114#define MCPC_CTRL_SET 0x31
115#define MCPC_CTRL_CLR 0x32
116#define MCPC_CTRL_RTSOL (1 << 7)
117#define MCPC_CTRL_EXTSWR (1 << 6)
118#define MCPC_CTRL_EXTSWC (1 << 5)
119#define MCPC_CTRL_VOICESW (1 << 4)
120#define MCPC_CTRL_OUT64K (1 << 3)
121#define MCPC_CTRL_RTSCTSSW (1 << 2)
122#define MCPC_CTRL_HS_UART (1 << 0)
123
124#define MCPC_IO_CTRL 0x33
125#define MCPC_IO_CTRL_SET 0x34
126#define MCPC_IO_CTRL_CLR 0x35
127#define MCPC_IO_CTRL_MICBIASEN (1 << 5)
128#define MCPC_IO_CTRL_CTS_NPU (1 << 4)
129#define MCPC_IO_CTRL_RXD_PU (1 << 3)
130#define MCPC_IO_CTRL_TXDTYP (1 << 2)
131#define MCPC_IO_CTRL_CTSTYP (1 << 1)
132#define MCPC_IO_CTRL_RTSTYP (1 << 0)
133
134#define MCPC_CTRL2 0x36
135#define MCPC_CTRL2_SET 0x37
136#define MCPC_CTRL2_CLR 0x38
137#define MCPC_CTRL2_MCPC_CK_EN (1 << 0)
138
139#define OTHER_FUNC_CTRL 0x80
140#define OTHER_FUNC_CTRL_SET 0x81
141#define OTHER_FUNC_CTRL_CLR 0x82
142#define OTHER_FUNC_CTRL_BDIS_ACON_EN (1 << 4)
143#define OTHER_FUNC_CTRL_FIVEWIRE_MODE (1 << 2)
144
145#define OTHER_IFC_CTRL 0x83
146#define OTHER_IFC_CTRL_SET 0x84
147#define OTHER_IFC_CTRL_CLR 0x85
148#define OTHER_IFC_CTRL_OE_INT_EN (1 << 6)
149#define OTHER_IFC_CTRL_CEA2011_MODE (1 << 5)
150#define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN (1 << 4)
151#define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT (1 << 3)
152#define OTHER_IFC_CTRL_HIZ_ULPI (1 << 2)
153#define OTHER_IFC_CTRL_ALT_INT_REROUTE (1 << 0)
154
155#define OTHER_INT_EN_RISE 0x86
156#define OTHER_INT_EN_RISE_SET 0x87
157#define OTHER_INT_EN_RISE_CLR 0x88
158#define OTHER_INT_EN_FALL 0x89
159#define OTHER_INT_EN_FALL_SET 0x8A
160#define OTHER_INT_EN_FALL_CLR 0x8B
161#define OTHER_INT_STS 0x8C
162#define OTHER_INT_LATCH 0x8D
163#define OTHER_INT_VB_SESS_VLD (1 << 7)
164#define OTHER_INT_DM_HI (1 << 6) /* not valid for "latch" reg */
165#define OTHER_INT_DP_HI (1 << 5) /* not valid for "latch" reg */
166#define OTHER_INT_BDIS_ACON (1 << 3) /* not valid for "fall" regs */
167#define OTHER_INT_MANU (1 << 1)
168#define OTHER_INT_ABNORMAL_STRESS (1 << 0)
169
170#define ID_STATUS 0x96
171#define ID_RES_FLOAT (1 << 4)
172#define ID_RES_440K (1 << 3)
173#define ID_RES_200K (1 << 2)
174#define ID_RES_102K (1 << 1)
175#define ID_RES_GND (1 << 0)
176
177#define POWER_CTRL 0xAC
178#define POWER_CTRL_SET 0xAD
179#define POWER_CTRL_CLR 0xAE
180#define POWER_CTRL_OTG_ENAB (1 << 5)
181
182#define OTHER_IFC_CTRL2 0xAF
183#define OTHER_IFC_CTRL2_SET 0xB0
184#define OTHER_IFC_CTRL2_CLR 0xB1
185#define OTHER_IFC_CTRL2_ULPI_STP_LOW (1 << 4)
186#define OTHER_IFC_CTRL2_ULPI_TXEN_POL (1 << 3)
187#define OTHER_IFC_CTRL2_ULPI_4PIN_2430 (1 << 2)
188#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK (3 << 0) /* bits 0 and 1 */
189#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N (0 << 0)
190#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N (1 << 0)
191
192#define REG_CTRL_EN 0xB2
193#define REG_CTRL_EN_SET 0xB3
194#define REG_CTRL_EN_CLR 0xB4
195#define REG_CTRL_ERROR 0xB5
196#define ULPI_I2C_CONFLICT_INTEN (1 << 0)
197
198#define OTHER_FUNC_CTRL2 0xB8
199#define OTHER_FUNC_CTRL2_SET 0xB9
200#define OTHER_FUNC_CTRL2_CLR 0xBA
201#define OTHER_FUNC_CTRL2_VBAT_TIMER_EN (1 << 0)
202
203/* following registers do not have separate _clr and _set registers */
204#define VBUS_DEBOUNCE 0xC0
205#define ID_DEBOUNCE 0xC1
206#define VBAT_TIMER 0xD3
207#define PHY_PWR_CTRL 0xFD
208#define PHY_PWR_PHYPWD (1 << 0)
209#define PHY_CLK_CTRL 0xFE
210#define PHY_CLK_CTRL_CLOCKGATING_EN (1 << 2)
211#define PHY_CLK_CTRL_CLK32K_EN (1 << 1)
212#define REQ_PHY_DPLL_CLK (1 << 0)
213#define PHY_CLK_CTRL_STS 0xFF
214#define PHY_DPLL_CLK (1 << 0)
215
216/* In module TWL4030_MODULE_PM_MASTER */
217#define PROTECT_KEY 0x0E
218
219/* In module TWL4030_MODULE_PM_RECEIVER */
220#define VUSB_DEDICATED1 0x7D
221#define VUSB_DEDICATED2 0x7E
222#define VUSB1V5_DEV_GRP 0x71
223#define VUSB1V5_TYPE 0x72
224#define VUSB1V5_REMAP 0x73
225#define VUSB1V8_DEV_GRP 0x74
226#define VUSB1V8_TYPE 0x75
227#define VUSB1V8_REMAP 0x76
228#define VUSB3V1_DEV_GRP 0x77
229#define VUSB3V1_TYPE 0x78
230#define VUSB3V1_REMAP 0x79
231
232/* In module TWL4030_MODULE_INTBR */
233#define PMBR1 0x0D
234#define GPIO_USB_4PIN_ULPI_2430C (3 << 0)
235
236
237
238enum linkstat {
239 USB_LINK_UNKNOWN = 0,
240 USB_LINK_NONE,
241 USB_LINK_VBUS,
242 USB_LINK_ID,
243};
244
245struct twl4030_usb {
246 struct otg_transceiver otg;
247 struct device *dev;
248
249 /* for vbus reporting with irqs disabled */
250 spinlock_t lock;
251
252 /* pin configuration */
253 enum twl4030_usb_mode usb_mode;
254
255 int irq;
256 u8 linkstat;
257 u8 asleep;
258 bool irq_enabled;
259};
260
261/* internal define on top of container_of */
262#define xceiv_to_twl(x) container_of((x), struct twl4030_usb, otg);
263
264/*-------------------------------------------------------------------------*/
265
266static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
267 u8 module, u8 data, u8 address)
268{
269 u8 check;
270
271 if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
272 (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
273 (check == data))
274 return 0;
275 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
276 1, module, address, check, data);
277
278 /* Failed once: Try again */
279 if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
280 (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
281 (check == data))
282 return 0;
283 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
284 2, module, address, check, data);
285
286 /* Failed again: Return error */
287 return -EBUSY;
288}
289
290#define twl4030_usb_write_verify(twl, address, data) \
291 twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
292
293static inline int twl4030_usb_write(struct twl4030_usb *twl,
294 u8 address, u8 data)
295{
296 int ret = 0;
297
298 ret = twl4030_i2c_write_u8(TWL4030_MODULE_USB, data, address);
299 if (ret < 0)
300 dev_dbg(twl->dev,
301 "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
302 return ret;
303}
304
305static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
306{
307 u8 data;
308 int ret = 0;
309
310 ret = twl4030_i2c_read_u8(module, &data, address);
311 if (ret >= 0)
312 ret = data;
313 else
314 dev_dbg(twl->dev,
315 "TWL4030:readb[0x%x,0x%x] Error %d\n",
316 module, address, ret);
317
318 return ret;
319}
320
321static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
322{
323 return twl4030_readb(twl, TWL4030_MODULE_USB, address);
324}
325
326/*-------------------------------------------------------------------------*/
327
328static inline int
329twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
330{
331 return twl4030_usb_write(twl, reg + 1, bits);
332}
333
334static inline int
335twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
336{
337 return twl4030_usb_write(twl, reg + 2, bits);
338}
339
340/*-------------------------------------------------------------------------*/
341
342static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
343{
344 int status;
345 int linkstat = USB_LINK_UNKNOWN;
346
347 /* STS_HW_CONDITIONS */
348 status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f);
349 if (status < 0)
350 dev_err(twl->dev, "USB link status err %d\n", status);
351 else if (status & BIT(7))
352 linkstat = USB_LINK_VBUS;
353 else if (status & BIT(2))
354 linkstat = USB_LINK_ID;
355 else
356 linkstat = USB_LINK_NONE;
357
358 dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
359 status, status, linkstat);
360
361 /* REVISIT this assumes host and peripheral controllers
362 * are registered, and that both are active...
363 */
364
365 spin_lock_irq(&twl->lock);
366 twl->linkstat = linkstat;
367 if (linkstat == USB_LINK_ID) {
368 twl->otg.default_a = true;
369 twl->otg.state = OTG_STATE_A_IDLE;
370 } else {
371 twl->otg.default_a = false;
372 twl->otg.state = OTG_STATE_B_IDLE;
373 }
374 spin_unlock_irq(&twl->lock);
375
376 return linkstat;
377}
378
379static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
380{
381 twl->usb_mode = mode;
382
383 switch (mode) {
384 case T2_USB_MODE_ULPI:
385 twl4030_usb_clear_bits(twl, IFC_CTRL, IFC_CTRL_CARKITMODE);
386 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
387 twl4030_usb_clear_bits(twl, FUNC_CTRL,
388 FUNC_CTRL_XCVRSELECT_MASK |
389 FUNC_CTRL_OPMODE_MASK);
390 break;
391 case -1:
392 /* FIXME: power on defaults */
393 break;
394 default:
395 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
396 mode);
397 break;
398 };
399}
400
401static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
402{
403 unsigned long timeout;
404 int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
405
406 if (val >= 0) {
407 if (on) {
408 /* enable DPLL to access PHY registers over I2C */
409 val |= REQ_PHY_DPLL_CLK;
410 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
411 (u8)val) < 0);
412
413 timeout = jiffies + HZ;
414 while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
415 PHY_DPLL_CLK)
416 && time_before(jiffies, timeout))
417 udelay(10);
418 if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
419 PHY_DPLL_CLK))
420 dev_err(twl->dev, "Timeout setting T2 HSUSB "
421 "PHY DPLL clock\n");
422 } else {
423 /* let ULPI control the DPLL clock */
424 val &= ~REQ_PHY_DPLL_CLK;
425 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
426 (u8)val) < 0);
427 }
428 }
429}
430
431static void twl4030_phy_power(struct twl4030_usb *twl, int on)
432{
433 u8 pwr;
434
435 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
436 if (on) {
437 pwr &= ~PHY_PWR_PHYPWD;
438 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
439 twl4030_usb_write(twl, PHY_CLK_CTRL,
440 twl4030_usb_read(twl, PHY_CLK_CTRL) |
441 (PHY_CLK_CTRL_CLOCKGATING_EN |
442 PHY_CLK_CTRL_CLK32K_EN));
443 } else {
444 pwr |= PHY_PWR_PHYPWD;
445 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
446 }
447}
448
449static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
450{
451 if (twl->asleep)
452 return;
453
454 twl4030_phy_power(twl, 0);
455 twl->asleep = 1;
456}
457
458static void twl4030_phy_resume(struct twl4030_usb *twl)
459{
460 if (!twl->asleep)
461 return;
462
463 twl4030_phy_power(twl, 1);
464 twl4030_i2c_access(twl, 1);
465 twl4030_usb_set_mode(twl, twl->usb_mode);
466 if (twl->usb_mode == T2_USB_MODE_ULPI)
467 twl4030_i2c_access(twl, 0);
468 twl->asleep = 0;
469}
470
471static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
472{
473 /* Enable writing to power configuration registers */
474 twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
475 twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY);
476
477 /* put VUSB3V1 LDO in active state */
478 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
479
480 /* input to VUSB3V1 LDO is from VBAT, not VBUS */
481 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
482
483 /* turn on 3.1V regulator */
484 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
485 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
486
487 /* turn on 1.5V regulator */
488 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
489 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
490
491 /* turn on 1.8V regulator */
492 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
493 twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
494
495 /* disable access to power configuration registers */
496 twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
497}
498
499static ssize_t twl4030_usb_vbus_show(struct device *dev,
500 struct device_attribute *attr, char *buf)
501{
502 struct twl4030_usb *twl = dev_get_drvdata(dev);
503 unsigned long flags;
504 int ret = -EINVAL;
505
506 spin_lock_irqsave(&twl->lock, flags);
507 ret = sprintf(buf, "%s\n",
508 (twl->linkstat == USB_LINK_VBUS) ? "on" : "off");
509 spin_unlock_irqrestore(&twl->lock, flags);
510
511 return ret;
512}
513static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
514
515static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
516{
517 struct twl4030_usb *twl = _twl;
518 int status;
519
520#ifdef CONFIG_LOCKDEP
521 /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
522 * we don't want and can't tolerate. Although it might be
523 * friendlier not to borrow this thread context...
524 */
525 local_irq_enable();
526#endif
527
528 status = twl4030_usb_linkstat(twl);
529 if (status != USB_LINK_UNKNOWN) {
530
531 /* FIXME add a set_power() method so that B-devices can
532 * configure the charger appropriately. It's not always
533 * correct to consume VBUS power, and how much current to
534 * consume is a function of the USB configuration chosen
535 * by the host.
536 *
537 * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
538 * its disconnect() sibling, when changing to/from the
539 * USB_LINK_VBUS state. musb_hdrc won't care until it
540 * starts to handle softconnect right.
541 */
542 twl4030charger_usb_en(status == USB_LINK_VBUS);
543
544 if (status == USB_LINK_NONE)
545 twl4030_phy_suspend(twl, 0);
546 else
547 twl4030_phy_resume(twl);
548 }
549 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
550
551 return IRQ_HANDLED;
552}
553
554static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
555{
556 struct twl4030_usb *twl = xceiv_to_twl(x);
557
558 if (suspend)
559 twl4030_phy_suspend(twl, 1);
560 else
561 twl4030_phy_resume(twl);
562
563 return 0;
564}
565
566static int twl4030_set_peripheral(struct otg_transceiver *x,
567 struct usb_gadget *gadget)
568{
569 struct twl4030_usb *twl;
570
571 if (!x)
572 return -ENODEV;
573
574 twl = xceiv_to_twl(x);
575 twl->otg.gadget = gadget;
576 if (!gadget)
577 twl->otg.state = OTG_STATE_UNDEFINED;
578
579 return 0;
580}
581
582static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
583{
584 struct twl4030_usb *twl;
585
586 if (!x)
587 return -ENODEV;
588
589 twl = xceiv_to_twl(x);
590 twl->otg.host = host;
591 if (!host)
592 twl->otg.state = OTG_STATE_UNDEFINED;
593
594 return 0;
595}
596
597static int __init twl4030_usb_probe(struct platform_device *pdev)
598{
599 struct twl4030_usb_data *pdata = pdev->dev.platform_data;
600 struct twl4030_usb *twl;
601 int status;
602
603 if (!pdata) {
604 dev_dbg(&pdev->dev, "platform_data not available\n");
605 return -EINVAL;
606 }
607
608 twl = kzalloc(sizeof *twl, GFP_KERNEL);
609 if (!twl)
610 return -ENOMEM;
611
612 twl->dev = &pdev->dev;
613 twl->irq = platform_get_irq(pdev, 0);
614 twl->otg.dev = twl->dev;
615 twl->otg.label = "twl4030";
616 twl->otg.set_host = twl4030_set_host;
617 twl->otg.set_peripheral = twl4030_set_peripheral;
618 twl->otg.set_suspend = twl4030_set_suspend;
619 twl->usb_mode = pdata->usb_mode;
620 twl->asleep = 1;
621
622 /* init spinlock for workqueue */
623 spin_lock_init(&twl->lock);
624
625 twl4030_usb_ldo_init(twl);
626 otg_set_transceiver(&twl->otg);
627
628 platform_set_drvdata(pdev, twl);
629 if (device_create_file(&pdev->dev, &dev_attr_vbus))
630 dev_warn(&pdev->dev, "could not create sysfs file\n");
631
632 /* Our job is to use irqs and status from the power module
633 * to keep the transceiver disabled when nothing's connected.
634 *
635 * FIXME we actually shouldn't start enabling it until the
636 * USB controller drivers have said they're ready, by calling
637 * set_host() and/or set_peripheral() ... OTG_capable boards
638 * need both handles, otherwise just one suffices.
639 */
640 twl->irq_enabled = true;
641 status = request_irq(twl->irq, twl4030_usb_irq,
642 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
643 "twl4030_usb", twl);
644 if (status < 0) {
645 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
646 twl->irq, status);
647 kfree(twl);
648 return status;
649 }
650
651 /* The IRQ handler just handles changes from the previous states
652 * of the ID and VBUS pins ... in probe() we must initialize that
653 * previous state. The easy way: fake an IRQ.
654 *
655 * REVISIT: a real IRQ might have happened already, if PREEMPT is
656 * enabled. Else the IRQ may not yet be configured or enabled,
657 * because of scheduling delays.
658 */
659 twl4030_usb_irq(twl->irq, twl);
660
661 dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
662 return 0;
663}
664
665static int __exit twl4030_usb_remove(struct platform_device *pdev)
666{
667 struct twl4030_usb *twl = platform_get_drvdata(pdev);
668 int val;
669
670 free_irq(twl->irq, twl);
671 device_remove_file(twl->dev, &dev_attr_vbus);
672
673 /* set transceiver mode to power on defaults */
674 twl4030_usb_set_mode(twl, -1);
675
676 /* autogate 60MHz ULPI clock,
677 * clear dpll clock request for i2c access,
678 * disable 32KHz
679 */
680 val = twl4030_usb_read(twl, PHY_CLK_CTRL);
681 if (val >= 0) {
682 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
683 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
684 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
685 }
686
687 /* disable complete OTG block */
688 twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
689
690 twl4030_phy_power(twl, 0);
691
692 kfree(twl);
693
694 return 0;
695}
696
697static struct platform_driver twl4030_usb_driver = {
698 .probe = twl4030_usb_probe,
699 .remove = __exit_p(twl4030_usb_remove),
700 .driver = {
701 .name = "twl4030_usb",
702 .owner = THIS_MODULE,
703 },
704};
705
706static int __init twl4030_usb_init(void)
707{
708 return platform_driver_register(&twl4030_usb_driver);
709}
710subsys_initcall(twl4030_usb_init);
711
712static void __exit twl4030_usb_exit(void)
713{
714 platform_driver_unregister(&twl4030_usb_driver);
715}
716module_exit(twl4030_usb_exit);
717
718MODULE_ALIAS("platform:twl4030_usb");
719MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
720MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
721MODULE_LICENSE("GPL");
Empty description
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