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/workqueue.h>
32 #include <linux/io.h>
33 #include <linux/delay.h>
34 #include <linux/usb/otg.h>
35 #include <linux/phy/phy.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/usb/musb-omap.h>
38 #include <linux/usb/ulpi.h>
39 #include <linux/i2c/twl.h>
40 #include <linux/regulator/consumer.h>
41 #include <linux/err.h>
42 #include <linux/slab.h>
43
44 /* Register defines */
45
46 #define MCPC_CTRL 0x30
47 #define MCPC_CTRL_RTSOL (1 << 7)
48 #define MCPC_CTRL_EXTSWR (1 << 6)
49 #define MCPC_CTRL_EXTSWC (1 << 5)
50 #define MCPC_CTRL_VOICESW (1 << 4)
51 #define MCPC_CTRL_OUT64K (1 << 3)
52 #define MCPC_CTRL_RTSCTSSW (1 << 2)
53 #define MCPC_CTRL_HS_UART (1 << 0)
54
55 #define MCPC_IO_CTRL 0x33
56 #define MCPC_IO_CTRL_MICBIASEN (1 << 5)
57 #define MCPC_IO_CTRL_CTS_NPU (1 << 4)
58 #define MCPC_IO_CTRL_RXD_PU (1 << 3)
59 #define MCPC_IO_CTRL_TXDTYP (1 << 2)
60 #define MCPC_IO_CTRL_CTSTYP (1 << 1)
61 #define MCPC_IO_CTRL_RTSTYP (1 << 0)
62
63 #define MCPC_CTRL2 0x36
64 #define MCPC_CTRL2_MCPC_CK_EN (1 << 0)
65
66 #define OTHER_FUNC_CTRL 0x80
67 #define OTHER_FUNC_CTRL_BDIS_ACON_EN (1 << 4)
68 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE (1 << 2)
69
70 #define OTHER_IFC_CTRL 0x83
71 #define OTHER_IFC_CTRL_OE_INT_EN (1 << 6)
72 #define OTHER_IFC_CTRL_CEA2011_MODE (1 << 5)
73 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN (1 << 4)
74 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT (1 << 3)
75 #define OTHER_IFC_CTRL_HIZ_ULPI (1 << 2)
76 #define OTHER_IFC_CTRL_ALT_INT_REROUTE (1 << 0)
77
78 #define OTHER_INT_EN_RISE 0x86
79 #define OTHER_INT_EN_FALL 0x89
80 #define OTHER_INT_STS 0x8C
81 #define OTHER_INT_LATCH 0x8D
82 #define OTHER_INT_VB_SESS_VLD (1 << 7)
83 #define OTHER_INT_DM_HI (1 << 6) /* not valid for "latch" reg */
84 #define OTHER_INT_DP_HI (1 << 5) /* not valid for "latch" reg */
85 #define OTHER_INT_BDIS_ACON (1 << 3) /* not valid for "fall" regs */
86 #define OTHER_INT_MANU (1 << 1)
87 #define OTHER_INT_ABNORMAL_STRESS (1 << 0)
88
89 #define ID_STATUS 0x96
90 #define ID_RES_FLOAT (1 << 4)
91 #define ID_RES_440K (1 << 3)
92 #define ID_RES_200K (1 << 2)
93 #define ID_RES_102K (1 << 1)
94 #define ID_RES_GND (1 << 0)
95
96 #define POWER_CTRL 0xAC
97 #define POWER_CTRL_OTG_ENAB (1 << 5)
98
99 #define OTHER_IFC_CTRL2 0xAF
100 #define OTHER_IFC_CTRL2_ULPI_STP_LOW (1 << 4)
101 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL (1 << 3)
102 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430 (1 << 2)
103 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK (3 << 0) /* bits 0 and 1 */
104 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N (0 << 0)
105 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N (1 << 0)
106
107 #define REG_CTRL_EN 0xB2
108 #define REG_CTRL_ERROR 0xB5
109 #define ULPI_I2C_CONFLICT_INTEN (1 << 0)
110
111 #define OTHER_FUNC_CTRL2 0xB8
112 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN (1 << 0)
113
114 /* following registers do not have separate _clr and _set registers */
115 #define VBUS_DEBOUNCE 0xC0
116 #define ID_DEBOUNCE 0xC1
117 #define VBAT_TIMER 0xD3
118 #define PHY_PWR_CTRL 0xFD
119 #define PHY_PWR_PHYPWD (1 << 0)
120 #define PHY_CLK_CTRL 0xFE
121 #define PHY_CLK_CTRL_CLOCKGATING_EN (1 << 2)
122 #define PHY_CLK_CTRL_CLK32K_EN (1 << 1)
123 #define REQ_PHY_DPLL_CLK (1 << 0)
124 #define PHY_CLK_CTRL_STS 0xFF
125 #define PHY_DPLL_CLK (1 << 0)
126
127 /* In module TWL_MODULE_PM_MASTER */
128 #define STS_HW_CONDITIONS 0x0F
129
130 /* In module TWL_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 /*
148 * If VBUS is valid or ID is ground, then we know a
149 * cable is present and we need to be runtime-enabled
150 */
cable_present(enum omap_musb_vbus_id_status stat)151 static inline bool cable_present(enum omap_musb_vbus_id_status stat)
152 {
153 return stat == OMAP_MUSB_VBUS_VALID ||
154 stat == OMAP_MUSB_ID_GROUND;
155 }
156
157 struct twl4030_usb {
158 struct usb_phy phy;
159 struct device *dev;
160
161 /* TWL4030 internal USB regulator supplies */
162 struct regulator *usb1v5;
163 struct regulator *usb1v8;
164 struct regulator *usb3v1;
165
166 /* for vbus reporting with irqs disabled */
167 struct mutex lock;
168
169 /* pin configuration */
170 enum twl4030_usb_mode usb_mode;
171
172 int irq;
173 enum omap_musb_vbus_id_status linkstat;
174 bool vbus_supplied;
175
176 struct delayed_work id_workaround_work;
177 };
178
179 /* internal define on top of container_of */
180 #define phy_to_twl(x) container_of((x), struct twl4030_usb, phy)
181
182 /*-------------------------------------------------------------------------*/
183
twl4030_i2c_write_u8_verify(struct twl4030_usb * twl,u8 module,u8 data,u8 address)184 static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
185 u8 module, u8 data, u8 address)
186 {
187 u8 check;
188
189 if ((twl_i2c_write_u8(module, data, address) >= 0) &&
190 (twl_i2c_read_u8(module, &check, address) >= 0) &&
191 (check == data))
192 return 0;
193 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
194 1, module, address, check, data);
195
196 /* Failed once: Try again */
197 if ((twl_i2c_write_u8(module, data, address) >= 0) &&
198 (twl_i2c_read_u8(module, &check, address) >= 0) &&
199 (check == data))
200 return 0;
201 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
202 2, module, address, check, data);
203
204 /* Failed again: Return error */
205 return -EBUSY;
206 }
207
208 #define twl4030_usb_write_verify(twl, address, data) \
209 twl4030_i2c_write_u8_verify(twl, TWL_MODULE_USB, (data), (address))
210
twl4030_usb_write(struct twl4030_usb * twl,u8 address,u8 data)211 static inline int twl4030_usb_write(struct twl4030_usb *twl,
212 u8 address, u8 data)
213 {
214 int ret = 0;
215
216 ret = twl_i2c_write_u8(TWL_MODULE_USB, data, address);
217 if (ret < 0)
218 dev_dbg(twl->dev,
219 "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
220 return ret;
221 }
222
twl4030_readb(struct twl4030_usb * twl,u8 module,u8 address)223 static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
224 {
225 u8 data;
226 int ret = 0;
227
228 ret = twl_i2c_read_u8(module, &data, address);
229 if (ret >= 0)
230 ret = data;
231 else
232 dev_dbg(twl->dev,
233 "TWL4030:readb[0x%x,0x%x] Error %d\n",
234 module, address, ret);
235
236 return ret;
237 }
238
twl4030_usb_read(struct twl4030_usb * twl,u8 address)239 static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
240 {
241 return twl4030_readb(twl, TWL_MODULE_USB, address);
242 }
243
244 /*-------------------------------------------------------------------------*/
245
246 static inline int
twl4030_usb_set_bits(struct twl4030_usb * twl,u8 reg,u8 bits)247 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
248 {
249 return twl4030_usb_write(twl, ULPI_SET(reg), bits);
250 }
251
252 static inline int
twl4030_usb_clear_bits(struct twl4030_usb * twl,u8 reg,u8 bits)253 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
254 {
255 return twl4030_usb_write(twl, ULPI_CLR(reg), bits);
256 }
257
258 /*-------------------------------------------------------------------------*/
259
twl4030_is_driving_vbus(struct twl4030_usb * twl)260 static bool twl4030_is_driving_vbus(struct twl4030_usb *twl)
261 {
262 int ret;
263
264 ret = twl4030_usb_read(twl, PHY_CLK_CTRL_STS);
265 if (ret < 0 || !(ret & PHY_DPLL_CLK))
266 /*
267 * if clocks are off, registers are not updated,
268 * but we can assume we don't drive VBUS in this case
269 */
270 return false;
271
272 ret = twl4030_usb_read(twl, ULPI_OTG_CTRL);
273 if (ret < 0)
274 return false;
275
276 return (ret & (ULPI_OTG_DRVVBUS | ULPI_OTG_CHRGVBUS)) ? true : false;
277 }
278
279 static enum omap_musb_vbus_id_status
twl4030_usb_linkstat(struct twl4030_usb * twl)280 twl4030_usb_linkstat(struct twl4030_usb *twl)
281 {
282 int status;
283 enum omap_musb_vbus_id_status linkstat = OMAP_MUSB_UNKNOWN;
284
285 twl->vbus_supplied = false;
286
287 /*
288 * For ID/VBUS sensing, see manual section 15.4.8 ...
289 * except when using only battery backup power, two
290 * comparators produce VBUS_PRES and ID_PRES signals,
291 * which don't match docs elsewhere. But ... BIT(7)
292 * and BIT(2) of STS_HW_CONDITIONS, respectively, do
293 * seem to match up. If either is true the USB_PRES
294 * signal is active, the OTG module is activated, and
295 * its interrupt may be raised (may wake the system).
296 */
297 status = twl4030_readb(twl, TWL_MODULE_PM_MASTER, STS_HW_CONDITIONS);
298 if (status < 0)
299 dev_err(twl->dev, "USB link status err %d\n", status);
300 else if (status & (BIT(7) | BIT(2))) {
301 if (status & BIT(7)) {
302 if (twl4030_is_driving_vbus(twl))
303 status &= ~BIT(7);
304 else
305 twl->vbus_supplied = true;
306 }
307
308 if (status & BIT(2))
309 linkstat = OMAP_MUSB_ID_GROUND;
310 else if (status & BIT(7))
311 linkstat = OMAP_MUSB_VBUS_VALID;
312 else
313 linkstat = OMAP_MUSB_VBUS_OFF;
314 } else {
315 if (twl->linkstat != OMAP_MUSB_UNKNOWN)
316 linkstat = OMAP_MUSB_VBUS_OFF;
317 }
318
319 dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
320 status, status, linkstat);
321
322 /* REVISIT this assumes host and peripheral controllers
323 * are registered, and that both are active...
324 */
325
326 return linkstat;
327 }
328
twl4030_usb_set_mode(struct twl4030_usb * twl,int mode)329 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
330 {
331 twl->usb_mode = mode;
332
333 switch (mode) {
334 case T2_USB_MODE_ULPI:
335 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
336 ULPI_IFC_CTRL_CARKITMODE);
337 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
338 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
339 ULPI_FUNC_CTRL_XCVRSEL_MASK |
340 ULPI_FUNC_CTRL_OPMODE_MASK);
341 break;
342 case -1:
343 /* FIXME: power on defaults */
344 break;
345 default:
346 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
347 mode);
348 break;
349 }
350 }
351
twl4030_i2c_access(struct twl4030_usb * twl,int on)352 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
353 {
354 unsigned long timeout;
355 int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
356
357 if (val >= 0) {
358 if (on) {
359 /* enable DPLL to access PHY registers over I2C */
360 val |= REQ_PHY_DPLL_CLK;
361 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
362 (u8)val) < 0);
363
364 timeout = jiffies + HZ;
365 while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
366 PHY_DPLL_CLK)
367 && time_before(jiffies, timeout))
368 udelay(10);
369 if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
370 PHY_DPLL_CLK))
371 dev_err(twl->dev, "Timeout setting T2 HSUSB "
372 "PHY DPLL clock\n");
373 } else {
374 /* let ULPI control the DPLL clock */
375 val &= ~REQ_PHY_DPLL_CLK;
376 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
377 (u8)val) < 0);
378 }
379 }
380 }
381
__twl4030_phy_power(struct twl4030_usb * twl,int on)382 static void __twl4030_phy_power(struct twl4030_usb *twl, int on)
383 {
384 u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
385
386 if (on)
387 pwr &= ~PHY_PWR_PHYPWD;
388 else
389 pwr |= PHY_PWR_PHYPWD;
390
391 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
392 }
393
twl4030_usb_runtime_suspend(struct device * dev)394 static int twl4030_usb_runtime_suspend(struct device *dev)
395 {
396 struct twl4030_usb *twl = dev_get_drvdata(dev);
397
398 dev_dbg(twl->dev, "%s\n", __func__);
399
400 __twl4030_phy_power(twl, 0);
401 regulator_disable(twl->usb1v5);
402 regulator_disable(twl->usb1v8);
403 regulator_disable(twl->usb3v1);
404
405 return 0;
406 }
407
twl4030_usb_runtime_resume(struct device * dev)408 static int twl4030_usb_runtime_resume(struct device *dev)
409 {
410 struct twl4030_usb *twl = dev_get_drvdata(dev);
411 int res;
412
413 dev_dbg(twl->dev, "%s\n", __func__);
414
415 res = regulator_enable(twl->usb3v1);
416 if (res)
417 dev_err(twl->dev, "Failed to enable usb3v1\n");
418
419 res = regulator_enable(twl->usb1v8);
420 if (res)
421 dev_err(twl->dev, "Failed to enable usb1v8\n");
422
423 /*
424 * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
425 * in twl4030) resets the VUSB_DEDICATED2 register. This reset
426 * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
427 * SLEEP. We work around this by clearing the bit after usv3v1
428 * is re-activated. This ensures that VUSB3V1 is really active.
429 */
430 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
431
432 res = regulator_enable(twl->usb1v5);
433 if (res)
434 dev_err(twl->dev, "Failed to enable usb1v5\n");
435
436 __twl4030_phy_power(twl, 1);
437 twl4030_usb_write(twl, PHY_CLK_CTRL,
438 twl4030_usb_read(twl, PHY_CLK_CTRL) |
439 (PHY_CLK_CTRL_CLOCKGATING_EN |
440 PHY_CLK_CTRL_CLK32K_EN));
441
442 return 0;
443 }
444
twl4030_phy_power_off(struct phy * phy)445 static int twl4030_phy_power_off(struct phy *phy)
446 {
447 struct twl4030_usb *twl = phy_get_drvdata(phy);
448
449 dev_dbg(twl->dev, "%s\n", __func__);
450 pm_runtime_mark_last_busy(twl->dev);
451 pm_runtime_put_autosuspend(twl->dev);
452
453 return 0;
454 }
455
twl4030_phy_power_on(struct phy * phy)456 static int twl4030_phy_power_on(struct phy *phy)
457 {
458 struct twl4030_usb *twl = phy_get_drvdata(phy);
459
460 dev_dbg(twl->dev, "%s\n", __func__);
461 pm_runtime_get_sync(twl->dev);
462 twl4030_i2c_access(twl, 1);
463 twl4030_usb_set_mode(twl, twl->usb_mode);
464 if (twl->usb_mode == T2_USB_MODE_ULPI)
465 twl4030_i2c_access(twl, 0);
466 schedule_delayed_work(&twl->id_workaround_work, 0);
467
468 return 0;
469 }
470
twl4030_usb_ldo_init(struct twl4030_usb * twl)471 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
472 {
473 /* Enable writing to power configuration registers */
474 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
475 TWL4030_PM_MASTER_PROTECT_KEY);
476
477 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
478 TWL4030_PM_MASTER_PROTECT_KEY);
479
480 /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/
481 /*twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/
482
483 /* input to VUSB3V1 LDO is from VBAT, not VBUS */
484 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
485
486 /* Initialize 3.1V regulator */
487 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
488
489 twl->usb3v1 = devm_regulator_get(twl->dev, "usb3v1");
490 if (IS_ERR(twl->usb3v1))
491 return -ENODEV;
492
493 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
494
495 /* Initialize 1.5V regulator */
496 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
497
498 twl->usb1v5 = devm_regulator_get(twl->dev, "usb1v5");
499 if (IS_ERR(twl->usb1v5))
500 return -ENODEV;
501
502 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
503
504 /* Initialize 1.8V regulator */
505 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
506
507 twl->usb1v8 = devm_regulator_get(twl->dev, "usb1v8");
508 if (IS_ERR(twl->usb1v8))
509 return -ENODEV;
510
511 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
512
513 /* disable access to power configuration registers */
514 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
515 TWL4030_PM_MASTER_PROTECT_KEY);
516
517 return 0;
518 }
519
twl4030_usb_vbus_show(struct device * dev,struct device_attribute * attr,char * buf)520 static ssize_t twl4030_usb_vbus_show(struct device *dev,
521 struct device_attribute *attr, char *buf)
522 {
523 struct twl4030_usb *twl = dev_get_drvdata(dev);
524 int ret = -EINVAL;
525
526 mutex_lock(&twl->lock);
527 ret = sprintf(buf, "%s\n",
528 twl->vbus_supplied ? "on" : "off");
529 mutex_unlock(&twl->lock);
530
531 return ret;
532 }
533 static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
534
twl4030_usb_irq(int irq,void * _twl)535 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
536 {
537 struct twl4030_usb *twl = _twl;
538 enum omap_musb_vbus_id_status status;
539 bool status_changed = false;
540
541 status = twl4030_usb_linkstat(twl);
542
543 mutex_lock(&twl->lock);
544 if (status >= 0 && status != twl->linkstat) {
545 status_changed =
546 cable_present(twl->linkstat) !=
547 cable_present(status);
548 twl->linkstat = status;
549 }
550 mutex_unlock(&twl->lock);
551
552 if (status_changed) {
553 /* FIXME add a set_power() method so that B-devices can
554 * configure the charger appropriately. It's not always
555 * correct to consume VBUS power, and how much current to
556 * consume is a function of the USB configuration chosen
557 * by the host.
558 *
559 * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
560 * its disconnect() sibling, when changing to/from the
561 * USB_LINK_VBUS state. musb_hdrc won't care until it
562 * starts to handle softconnect right.
563 */
564 if (cable_present(status)) {
565 pm_runtime_get_sync(twl->dev);
566 } else {
567 pm_runtime_mark_last_busy(twl->dev);
568 pm_runtime_put_autosuspend(twl->dev);
569 }
570 omap_musb_mailbox(status);
571 }
572
573 /* don't schedule during sleep - irq works right then */
574 if (status == OMAP_MUSB_ID_GROUND && pm_runtime_active(twl->dev)) {
575 cancel_delayed_work(&twl->id_workaround_work);
576 schedule_delayed_work(&twl->id_workaround_work, HZ);
577 }
578
579 if (irq)
580 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
581
582 return IRQ_HANDLED;
583 }
584
twl4030_id_workaround_work(struct work_struct * work)585 static void twl4030_id_workaround_work(struct work_struct *work)
586 {
587 struct twl4030_usb *twl = container_of(work, struct twl4030_usb,
588 id_workaround_work.work);
589
590 twl4030_usb_irq(0, twl);
591 }
592
twl4030_phy_init(struct phy * phy)593 static int twl4030_phy_init(struct phy *phy)
594 {
595 struct twl4030_usb *twl = phy_get_drvdata(phy);
596
597 pm_runtime_get_sync(twl->dev);
598 schedule_delayed_work(&twl->id_workaround_work, 0);
599 pm_runtime_mark_last_busy(twl->dev);
600 pm_runtime_put_autosuspend(twl->dev);
601
602 return 0;
603 }
604
twl4030_set_peripheral(struct usb_otg * otg,struct usb_gadget * gadget)605 static int twl4030_set_peripheral(struct usb_otg *otg,
606 struct usb_gadget *gadget)
607 {
608 if (!otg)
609 return -ENODEV;
610
611 otg->gadget = gadget;
612 if (!gadget)
613 otg->state = OTG_STATE_UNDEFINED;
614
615 return 0;
616 }
617
twl4030_set_host(struct usb_otg * otg,struct usb_bus * host)618 static int twl4030_set_host(struct usb_otg *otg, struct usb_bus *host)
619 {
620 if (!otg)
621 return -ENODEV;
622
623 otg->host = host;
624 if (!host)
625 otg->state = OTG_STATE_UNDEFINED;
626
627 return 0;
628 }
629
630 static const struct phy_ops ops = {
631 .init = twl4030_phy_init,
632 .power_on = twl4030_phy_power_on,
633 .power_off = twl4030_phy_power_off,
634 .owner = THIS_MODULE,
635 };
636
637 static const struct dev_pm_ops twl4030_usb_pm_ops = {
638 SET_RUNTIME_PM_OPS(twl4030_usb_runtime_suspend,
639 twl4030_usb_runtime_resume, NULL)
640 };
641
twl4030_usb_probe(struct platform_device * pdev)642 static int twl4030_usb_probe(struct platform_device *pdev)
643 {
644 struct twl4030_usb_data *pdata = dev_get_platdata(&pdev->dev);
645 struct twl4030_usb *twl;
646 struct phy *phy;
647 int status, err;
648 struct usb_otg *otg;
649 struct device_node *np = pdev->dev.of_node;
650 struct phy_provider *phy_provider;
651
652 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
653 if (!twl)
654 return -ENOMEM;
655
656 if (np)
657 of_property_read_u32(np, "usb_mode",
658 (enum twl4030_usb_mode *)&twl->usb_mode);
659 else if (pdata) {
660 twl->usb_mode = pdata->usb_mode;
661 } else {
662 dev_err(&pdev->dev, "twl4030 initialized without pdata\n");
663 return -EINVAL;
664 }
665
666 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
667 if (!otg)
668 return -ENOMEM;
669
670 twl->dev = &pdev->dev;
671 twl->irq = platform_get_irq(pdev, 0);
672 twl->vbus_supplied = false;
673 twl->linkstat = OMAP_MUSB_UNKNOWN;
674
675 twl->phy.dev = twl->dev;
676 twl->phy.label = "twl4030";
677 twl->phy.otg = otg;
678 twl->phy.type = USB_PHY_TYPE_USB2;
679
680 otg->usb_phy = &twl->phy;
681 otg->set_host = twl4030_set_host;
682 otg->set_peripheral = twl4030_set_peripheral;
683
684 phy = devm_phy_create(twl->dev, NULL, &ops);
685 if (IS_ERR(phy)) {
686 dev_dbg(&pdev->dev, "Failed to create PHY\n");
687 return PTR_ERR(phy);
688 }
689
690 phy_set_drvdata(phy, twl);
691
692 phy_provider = devm_of_phy_provider_register(twl->dev,
693 of_phy_simple_xlate);
694 if (IS_ERR(phy_provider))
695 return PTR_ERR(phy_provider);
696
697 /* init mutex for workqueue */
698 mutex_init(&twl->lock);
699
700 INIT_DELAYED_WORK(&twl->id_workaround_work, twl4030_id_workaround_work);
701
702 err = twl4030_usb_ldo_init(twl);
703 if (err) {
704 dev_err(&pdev->dev, "ldo init failed\n");
705 return err;
706 }
707 usb_add_phy_dev(&twl->phy);
708
709 platform_set_drvdata(pdev, twl);
710 if (device_create_file(&pdev->dev, &dev_attr_vbus))
711 dev_warn(&pdev->dev, "could not create sysfs file\n");
712
713 ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
714
715 pm_runtime_use_autosuspend(&pdev->dev);
716 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
717 pm_runtime_enable(&pdev->dev);
718 pm_runtime_get_sync(&pdev->dev);
719
720 /* Our job is to use irqs and status from the power module
721 * to keep the transceiver disabled when nothing's connected.
722 *
723 * FIXME we actually shouldn't start enabling it until the
724 * USB controller drivers have said they're ready, by calling
725 * set_host() and/or set_peripheral() ... OTG_capable boards
726 * need both handles, otherwise just one suffices.
727 */
728 status = devm_request_threaded_irq(twl->dev, twl->irq, NULL,
729 twl4030_usb_irq, IRQF_TRIGGER_FALLING |
730 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "twl4030_usb", twl);
731 if (status < 0) {
732 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
733 twl->irq, status);
734 return status;
735 }
736
737 if (pdata)
738 err = phy_create_lookup(phy, "usb", "musb-hdrc.0");
739 if (err)
740 return err;
741
742 pm_runtime_mark_last_busy(&pdev->dev);
743 pm_runtime_put_autosuspend(twl->dev);
744
745 dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
746 return 0;
747 }
748
twl4030_usb_remove(struct platform_device * pdev)749 static int twl4030_usb_remove(struct platform_device *pdev)
750 {
751 struct twl4030_usb *twl = platform_get_drvdata(pdev);
752 int val;
753
754 usb_remove_phy(&twl->phy);
755 pm_runtime_get_sync(twl->dev);
756 cancel_delayed_work(&twl->id_workaround_work);
757 device_remove_file(twl->dev, &dev_attr_vbus);
758
759 /* set transceiver mode to power on defaults */
760 twl4030_usb_set_mode(twl, -1);
761
762 /* idle ulpi before powering off */
763 if (cable_present(twl->linkstat))
764 pm_runtime_put_noidle(twl->dev);
765 pm_runtime_mark_last_busy(twl->dev);
766 pm_runtime_put_sync_suspend(twl->dev);
767 pm_runtime_disable(twl->dev);
768
769 /* autogate 60MHz ULPI clock,
770 * clear dpll clock request for i2c access,
771 * disable 32KHz
772 */
773 val = twl4030_usb_read(twl, PHY_CLK_CTRL);
774 if (val >= 0) {
775 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
776 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
777 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
778 }
779
780 /* disable complete OTG block */
781 twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
782
783 return 0;
784 }
785
786 #ifdef CONFIG_OF
787 static const struct of_device_id twl4030_usb_id_table[] = {
788 { .compatible = "ti,twl4030-usb" },
789 {}
790 };
791 MODULE_DEVICE_TABLE(of, twl4030_usb_id_table);
792 #endif
793
794 static struct platform_driver twl4030_usb_driver = {
795 .probe = twl4030_usb_probe,
796 .remove = twl4030_usb_remove,
797 .driver = {
798 .name = "twl4030_usb",
799 .pm = &twl4030_usb_pm_ops,
800 .of_match_table = of_match_ptr(twl4030_usb_id_table),
801 },
802 };
803
twl4030_usb_init(void)804 static int __init twl4030_usb_init(void)
805 {
806 return platform_driver_register(&twl4030_usb_driver);
807 }
808 subsys_initcall(twl4030_usb_init);
809
twl4030_usb_exit(void)810 static void __exit twl4030_usb_exit(void)
811 {
812 platform_driver_unregister(&twl4030_usb_driver);
813 }
814 module_exit(twl4030_usb_exit);
815
816 MODULE_ALIAS("platform:twl4030_usb");
817 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
818 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
819 MODULE_LICENSE("GPL");
820