1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
4 *
5 * Copyright (C) 2004-2007 Texas Instruments
6 * Copyright (C) 2008 Nokia Corporation
7 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
8 *
9 * Current status:
10 * - HS USB ULPI mode works.
11 * - 3-pin mode support may be added in future.
12 */
13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/workqueue.h>
20 #include <linux/io.h>
21 #include <linux/delay.h>
22 #include <linux/usb/otg.h>
23 #include <linux/phy/phy.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/usb/musb.h>
26 #include <linux/usb/ulpi.h>
27 #include <linux/mfd/twl.h>
28 #include <linux/regulator/consumer.h>
29 #include <linux/err.h>
30 #include <linux/slab.h>
31
32 /* Register defines */
33
34 #define MCPC_CTRL 0x30
35 #define MCPC_CTRL_RTSOL (1 << 7)
36 #define MCPC_CTRL_EXTSWR (1 << 6)
37 #define MCPC_CTRL_EXTSWC (1 << 5)
38 #define MCPC_CTRL_VOICESW (1 << 4)
39 #define MCPC_CTRL_OUT64K (1 << 3)
40 #define MCPC_CTRL_RTSCTSSW (1 << 2)
41 #define MCPC_CTRL_HS_UART (1 << 0)
42
43 #define MCPC_IO_CTRL 0x33
44 #define MCPC_IO_CTRL_MICBIASEN (1 << 5)
45 #define MCPC_IO_CTRL_CTS_NPU (1 << 4)
46 #define MCPC_IO_CTRL_RXD_PU (1 << 3)
47 #define MCPC_IO_CTRL_TXDTYP (1 << 2)
48 #define MCPC_IO_CTRL_CTSTYP (1 << 1)
49 #define MCPC_IO_CTRL_RTSTYP (1 << 0)
50
51 #define MCPC_CTRL2 0x36
52 #define MCPC_CTRL2_MCPC_CK_EN (1 << 0)
53
54 #define OTHER_FUNC_CTRL 0x80
55 #define OTHER_FUNC_CTRL_BDIS_ACON_EN (1 << 4)
56 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE (1 << 2)
57
58 #define OTHER_IFC_CTRL 0x83
59 #define OTHER_IFC_CTRL_OE_INT_EN (1 << 6)
60 #define OTHER_IFC_CTRL_CEA2011_MODE (1 << 5)
61 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN (1 << 4)
62 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT (1 << 3)
63 #define OTHER_IFC_CTRL_HIZ_ULPI (1 << 2)
64 #define OTHER_IFC_CTRL_ALT_INT_REROUTE (1 << 0)
65
66 #define OTHER_INT_EN_RISE 0x86
67 #define OTHER_INT_EN_FALL 0x89
68 #define OTHER_INT_STS 0x8C
69 #define OTHER_INT_LATCH 0x8D
70 #define OTHER_INT_VB_SESS_VLD (1 << 7)
71 #define OTHER_INT_DM_HI (1 << 6) /* not valid for "latch" reg */
72 #define OTHER_INT_DP_HI (1 << 5) /* not valid for "latch" reg */
73 #define OTHER_INT_BDIS_ACON (1 << 3) /* not valid for "fall" regs */
74 #define OTHER_INT_MANU (1 << 1)
75 #define OTHER_INT_ABNORMAL_STRESS (1 << 0)
76
77 #define ID_STATUS 0x96
78 #define ID_RES_FLOAT (1 << 4)
79 #define ID_RES_440K (1 << 3)
80 #define ID_RES_200K (1 << 2)
81 #define ID_RES_102K (1 << 1)
82 #define ID_RES_GND (1 << 0)
83
84 #define POWER_CTRL 0xAC
85 #define POWER_CTRL_OTG_ENAB (1 << 5)
86
87 #define OTHER_IFC_CTRL2 0xAF
88 #define OTHER_IFC_CTRL2_ULPI_STP_LOW (1 << 4)
89 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL (1 << 3)
90 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430 (1 << 2)
91 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK (3 << 0) /* bits 0 and 1 */
92 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N (0 << 0)
93 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N (1 << 0)
94
95 #define REG_CTRL_EN 0xB2
96 #define REG_CTRL_ERROR 0xB5
97 #define ULPI_I2C_CONFLICT_INTEN (1 << 0)
98
99 #define OTHER_FUNC_CTRL2 0xB8
100 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN (1 << 0)
101
102 /* following registers do not have separate _clr and _set registers */
103 #define VBUS_DEBOUNCE 0xC0
104 #define ID_DEBOUNCE 0xC1
105 #define VBAT_TIMER 0xD3
106 #define PHY_PWR_CTRL 0xFD
107 #define PHY_PWR_PHYPWD (1 << 0)
108 #define PHY_CLK_CTRL 0xFE
109 #define PHY_CLK_CTRL_CLOCKGATING_EN (1 << 2)
110 #define PHY_CLK_CTRL_CLK32K_EN (1 << 1)
111 #define REQ_PHY_DPLL_CLK (1 << 0)
112 #define PHY_CLK_CTRL_STS 0xFF
113 #define PHY_DPLL_CLK (1 << 0)
114
115 /* In module TWL_MODULE_PM_MASTER */
116 #define STS_HW_CONDITIONS 0x0F
117
118 /* In module TWL_MODULE_PM_RECEIVER */
119 #define VUSB_DEDICATED1 0x7D
120 #define VUSB_DEDICATED2 0x7E
121 #define VUSB1V5_DEV_GRP 0x71
122 #define VUSB1V5_TYPE 0x72
123 #define VUSB1V5_REMAP 0x73
124 #define VUSB1V8_DEV_GRP 0x74
125 #define VUSB1V8_TYPE 0x75
126 #define VUSB1V8_REMAP 0x76
127 #define VUSB3V1_DEV_GRP 0x77
128 #define VUSB3V1_TYPE 0x78
129 #define VUSB3V1_REMAP 0x79
130
131 /* In module TWL4030_MODULE_INTBR */
132 #define PMBR1 0x0D
133 #define GPIO_USB_4PIN_ULPI_2430C (3 << 0)
134
135 static irqreturn_t twl4030_usb_irq(int irq, void *_twl);
136 /*
137 * If VBUS is valid or ID is ground, then we know a
138 * cable is present and we need to be runtime-enabled
139 */
cable_present(enum musb_vbus_id_status stat)140 static inline bool cable_present(enum musb_vbus_id_status stat)
141 {
142 return stat == MUSB_VBUS_VALID ||
143 stat == MUSB_ID_GROUND;
144 }
145
146 struct twl4030_usb {
147 struct usb_phy phy;
148 struct device *dev;
149
150 /* TWL4030 internal USB regulator supplies */
151 struct regulator *usb1v5;
152 struct regulator *usb1v8;
153 struct regulator *usb3v1;
154
155 /* for vbus reporting with irqs disabled */
156 struct mutex lock;
157
158 /* pin configuration */
159 enum twl4030_usb_mode usb_mode;
160
161 int irq;
162 enum musb_vbus_id_status linkstat;
163 atomic_t connected;
164 bool vbus_supplied;
165 bool musb_mailbox_pending;
166 unsigned long runtime_suspended:1;
167 unsigned long needs_resume:1;
168
169 struct delayed_work id_workaround_work;
170 };
171
172 /* internal define on top of container_of */
173 #define phy_to_twl(x) container_of((x), struct twl4030_usb, phy)
174
175 /*-------------------------------------------------------------------------*/
176
twl4030_i2c_write_u8_verify(struct twl4030_usb * twl,u8 module,u8 data,u8 address)177 static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
178 u8 module, u8 data, u8 address)
179 {
180 u8 check = 0xFF;
181
182 if ((twl_i2c_write_u8(module, data, address) >= 0) &&
183 (twl_i2c_read_u8(module, &check, address) >= 0) &&
184 (check == data))
185 return 0;
186 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
187 1, module, address, check, data);
188
189 /* Failed once: Try again */
190 if ((twl_i2c_write_u8(module, data, address) >= 0) &&
191 (twl_i2c_read_u8(module, &check, address) >= 0) &&
192 (check == data))
193 return 0;
194 dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
195 2, module, address, check, data);
196
197 /* Failed again: Return error */
198 return -EBUSY;
199 }
200
201 #define twl4030_usb_write_verify(twl, address, data) \
202 twl4030_i2c_write_u8_verify(twl, TWL_MODULE_USB, (data), (address))
203
twl4030_usb_write(struct twl4030_usb * twl,u8 address,u8 data)204 static inline int twl4030_usb_write(struct twl4030_usb *twl,
205 u8 address, u8 data)
206 {
207 int ret = 0;
208
209 ret = twl_i2c_write_u8(TWL_MODULE_USB, data, address);
210 if (ret < 0)
211 dev_dbg(twl->dev,
212 "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
213 return ret;
214 }
215
twl4030_readb(struct twl4030_usb * twl,u8 module,u8 address)216 static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
217 {
218 u8 data;
219 int ret = 0;
220
221 ret = twl_i2c_read_u8(module, &data, address);
222 if (ret >= 0)
223 ret = data;
224 else
225 dev_dbg(twl->dev,
226 "TWL4030:readb[0x%x,0x%x] Error %d\n",
227 module, address, ret);
228
229 return ret;
230 }
231
twl4030_usb_read(struct twl4030_usb * twl,u8 address)232 static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
233 {
234 return twl4030_readb(twl, TWL_MODULE_USB, address);
235 }
236
237 /*-------------------------------------------------------------------------*/
238
239 static inline int
twl4030_usb_set_bits(struct twl4030_usb * twl,u8 reg,u8 bits)240 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
241 {
242 return twl4030_usb_write(twl, ULPI_SET(reg), bits);
243 }
244
245 static inline int
twl4030_usb_clear_bits(struct twl4030_usb * twl,u8 reg,u8 bits)246 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
247 {
248 return twl4030_usb_write(twl, ULPI_CLR(reg), bits);
249 }
250
251 /*-------------------------------------------------------------------------*/
252
twl4030_is_driving_vbus(struct twl4030_usb * twl)253 static bool twl4030_is_driving_vbus(struct twl4030_usb *twl)
254 {
255 int ret;
256
257 ret = twl4030_usb_read(twl, PHY_CLK_CTRL_STS);
258 if (ret < 0 || !(ret & PHY_DPLL_CLK))
259 /*
260 * if clocks are off, registers are not updated,
261 * but we can assume we don't drive VBUS in this case
262 */
263 return false;
264
265 ret = twl4030_usb_read(twl, ULPI_OTG_CTRL);
266 if (ret < 0)
267 return false;
268
269 return (ret & (ULPI_OTG_DRVVBUS | ULPI_OTG_CHRGVBUS)) ? true : false;
270 }
271
272 static enum musb_vbus_id_status
twl4030_usb_linkstat(struct twl4030_usb * twl)273 twl4030_usb_linkstat(struct twl4030_usb *twl)
274 {
275 int status;
276 enum musb_vbus_id_status linkstat = MUSB_UNKNOWN;
277
278 twl->vbus_supplied = false;
279
280 /*
281 * For ID/VBUS sensing, see manual section 15.4.8 ...
282 * except when using only battery backup power, two
283 * comparators produce VBUS_PRES and ID_PRES signals,
284 * which don't match docs elsewhere. But ... BIT(7)
285 * and BIT(2) of STS_HW_CONDITIONS, respectively, do
286 * seem to match up. If either is true the USB_PRES
287 * signal is active, the OTG module is activated, and
288 * its interrupt may be raised (may wake the system).
289 */
290 status = twl4030_readb(twl, TWL_MODULE_PM_MASTER, STS_HW_CONDITIONS);
291 if (status < 0)
292 dev_err(twl->dev, "USB link status err %d\n", status);
293 else if (status & (BIT(7) | BIT(2))) {
294 if (status & BIT(7)) {
295 if (twl4030_is_driving_vbus(twl))
296 status &= ~BIT(7);
297 else
298 twl->vbus_supplied = true;
299 }
300
301 if (status & BIT(2))
302 linkstat = MUSB_ID_GROUND;
303 else if (status & BIT(7))
304 linkstat = MUSB_VBUS_VALID;
305 else
306 linkstat = MUSB_VBUS_OFF;
307 } else {
308 if (twl->linkstat != MUSB_UNKNOWN)
309 linkstat = MUSB_VBUS_OFF;
310 }
311
312 kobject_uevent(&twl->dev->kobj, linkstat == MUSB_VBUS_VALID
313 ? KOBJ_ONLINE : KOBJ_OFFLINE);
314
315 dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
316 status, status, linkstat);
317
318 /* REVISIT this assumes host and peripheral controllers
319 * are registered, and that both are active...
320 */
321
322 return linkstat;
323 }
324
twl4030_usb_set_mode(struct twl4030_usb * twl,int mode)325 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
326 {
327 twl->usb_mode = mode;
328
329 switch (mode) {
330 case T2_USB_MODE_ULPI:
331 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
332 ULPI_IFC_CTRL_CARKITMODE);
333 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
334 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
335 ULPI_FUNC_CTRL_XCVRSEL_MASK |
336 ULPI_FUNC_CTRL_OPMODE_MASK);
337 break;
338 case -1:
339 /* FIXME: power on defaults */
340 break;
341 default:
342 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
343 mode);
344 break;
345 }
346 }
347
twl4030_i2c_access(struct twl4030_usb * twl,int on)348 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
349 {
350 unsigned long timeout;
351 int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
352
353 if (val >= 0) {
354 if (on) {
355 /* enable DPLL to access PHY registers over I2C */
356 val |= REQ_PHY_DPLL_CLK;
357 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
358 (u8)val) < 0);
359
360 timeout = jiffies + HZ;
361 while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
362 PHY_DPLL_CLK)
363 && time_before(jiffies, timeout))
364 udelay(10);
365 if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
366 PHY_DPLL_CLK))
367 dev_err(twl->dev, "Timeout setting T2 HSUSB "
368 "PHY DPLL clock\n");
369 } else {
370 /* let ULPI control the DPLL clock */
371 val &= ~REQ_PHY_DPLL_CLK;
372 WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
373 (u8)val) < 0);
374 }
375 }
376 }
377
__twl4030_phy_power(struct twl4030_usb * twl,int on)378 static void __twl4030_phy_power(struct twl4030_usb *twl, int on)
379 {
380 u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
381
382 if (on)
383 pwr &= ~PHY_PWR_PHYPWD;
384 else
385 pwr |= PHY_PWR_PHYPWD;
386
387 WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
388 }
389
390 static int twl4030_usb_runtime_suspend(struct device *dev);
391 static int twl4030_usb_runtime_resume(struct device *dev);
392
twl4030_usb_suspend(struct device * dev)393 static int __maybe_unused twl4030_usb_suspend(struct device *dev)
394 {
395 struct twl4030_usb *twl = dev_get_drvdata(dev);
396
397 /*
398 * we need enabled runtime on resume,
399 * so turn irq off here, so we do not get it early
400 * note: wakeup on usb plug works independently of this
401 */
402 dev_dbg(twl->dev, "%s\n", __func__);
403 disable_irq(twl->irq);
404 if (!twl->runtime_suspended && !atomic_read(&twl->connected)) {
405 twl4030_usb_runtime_suspend(dev);
406 twl->needs_resume = 1;
407 }
408
409 return 0;
410 }
411
twl4030_usb_resume(struct device * dev)412 static int __maybe_unused twl4030_usb_resume(struct device *dev)
413 {
414 struct twl4030_usb *twl = dev_get_drvdata(dev);
415
416 dev_dbg(twl->dev, "%s\n", __func__);
417 enable_irq(twl->irq);
418 if (twl->needs_resume)
419 twl4030_usb_runtime_resume(dev);
420 /* check whether cable status changed */
421 twl4030_usb_irq(0, twl);
422
423 twl->runtime_suspended = 0;
424
425 return 0;
426 }
427
twl4030_usb_runtime_suspend(struct device * dev)428 static int __maybe_unused twl4030_usb_runtime_suspend(struct device *dev)
429 {
430 struct twl4030_usb *twl = dev_get_drvdata(dev);
431
432 dev_dbg(twl->dev, "%s\n", __func__);
433
434 __twl4030_phy_power(twl, 0);
435 regulator_disable(twl->usb1v5);
436 regulator_disable(twl->usb1v8);
437 regulator_disable(twl->usb3v1);
438
439 twl->runtime_suspended = 1;
440
441 return 0;
442 }
443
twl4030_usb_runtime_resume(struct device * dev)444 static int __maybe_unused twl4030_usb_runtime_resume(struct device *dev)
445 {
446 struct twl4030_usb *twl = dev_get_drvdata(dev);
447 int res;
448
449 dev_dbg(twl->dev, "%s\n", __func__);
450
451 res = regulator_enable(twl->usb3v1);
452 if (res)
453 dev_err(twl->dev, "Failed to enable usb3v1\n");
454
455 res = regulator_enable(twl->usb1v8);
456 if (res)
457 dev_err(twl->dev, "Failed to enable usb1v8\n");
458
459 /*
460 * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
461 * in twl4030) resets the VUSB_DEDICATED2 register. This reset
462 * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
463 * SLEEP. We work around this by clearing the bit after usv3v1
464 * is re-activated. This ensures that VUSB3V1 is really active.
465 */
466 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
467
468 res = regulator_enable(twl->usb1v5);
469 if (res)
470 dev_err(twl->dev, "Failed to enable usb1v5\n");
471
472 __twl4030_phy_power(twl, 1);
473 twl4030_usb_write(twl, PHY_CLK_CTRL,
474 twl4030_usb_read(twl, PHY_CLK_CTRL) |
475 (PHY_CLK_CTRL_CLOCKGATING_EN |
476 PHY_CLK_CTRL_CLK32K_EN));
477
478 twl4030_i2c_access(twl, 1);
479 twl4030_usb_set_mode(twl, twl->usb_mode);
480 if (twl->usb_mode == T2_USB_MODE_ULPI)
481 twl4030_i2c_access(twl, 0);
482 /*
483 * According to the TPS65950 TRM, there has to be at least 50ms
484 * delay between setting POWER_CTRL_OTG_ENAB and enabling charging
485 * so wait here so that a fully enabled phy can be expected after
486 * resume
487 */
488 msleep(50);
489 return 0;
490 }
491
twl4030_phy_power_off(struct phy * phy)492 static int twl4030_phy_power_off(struct phy *phy)
493 {
494 struct twl4030_usb *twl = phy_get_drvdata(phy);
495
496 dev_dbg(twl->dev, "%s\n", __func__);
497
498 return 0;
499 }
500
twl4030_phy_power_on(struct phy * phy)501 static int twl4030_phy_power_on(struct phy *phy)
502 {
503 struct twl4030_usb *twl = phy_get_drvdata(phy);
504
505 dev_dbg(twl->dev, "%s\n", __func__);
506 pm_runtime_get_sync(twl->dev);
507 schedule_delayed_work(&twl->id_workaround_work, HZ);
508 pm_runtime_mark_last_busy(twl->dev);
509 pm_runtime_put_autosuspend(twl->dev);
510
511 return 0;
512 }
513
twl4030_usb_ldo_init(struct twl4030_usb * twl)514 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
515 {
516 /* Enable writing to power configuration registers */
517 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
518 TWL4030_PM_MASTER_PROTECT_KEY);
519
520 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
521 TWL4030_PM_MASTER_PROTECT_KEY);
522
523 /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/
524 /*twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/
525
526 /* input to VUSB3V1 LDO is from VBAT, not VBUS */
527 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
528
529 /* Initialize 3.1V regulator */
530 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
531
532 twl->usb3v1 = devm_regulator_get(twl->dev, "usb3v1");
533 if (IS_ERR(twl->usb3v1))
534 return -ENODEV;
535
536 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
537
538 /* Initialize 1.5V regulator */
539 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
540
541 twl->usb1v5 = devm_regulator_get(twl->dev, "usb1v5");
542 if (IS_ERR(twl->usb1v5))
543 return -ENODEV;
544
545 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
546
547 /* Initialize 1.8V regulator */
548 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
549
550 twl->usb1v8 = devm_regulator_get(twl->dev, "usb1v8");
551 if (IS_ERR(twl->usb1v8))
552 return -ENODEV;
553
554 twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
555
556 /* disable access to power configuration registers */
557 twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
558 TWL4030_PM_MASTER_PROTECT_KEY);
559
560 return 0;
561 }
562
vbus_show(struct device * dev,struct device_attribute * attr,char * buf)563 static ssize_t vbus_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565 {
566 struct twl4030_usb *twl = dev_get_drvdata(dev);
567 int ret = -EINVAL;
568
569 mutex_lock(&twl->lock);
570 ret = sprintf(buf, "%s\n",
571 twl->vbus_supplied ? "on" : "off");
572 mutex_unlock(&twl->lock);
573
574 return ret;
575 }
576 static DEVICE_ATTR_RO(vbus);
577
twl4030_usb_irq(int irq,void * _twl)578 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
579 {
580 struct twl4030_usb *twl = _twl;
581 enum musb_vbus_id_status status;
582 int err;
583
584 status = twl4030_usb_linkstat(twl);
585
586 mutex_lock(&twl->lock);
587 twl->linkstat = status;
588 mutex_unlock(&twl->lock);
589
590 if (cable_present(status)) {
591 if (atomic_add_unless(&twl->connected, 1, 1)) {
592 dev_dbg(twl->dev, "%s: cable connected %i\n",
593 __func__, status);
594 pm_runtime_get_sync(twl->dev);
595 twl->musb_mailbox_pending = true;
596 }
597 } else {
598 if (atomic_add_unless(&twl->connected, -1, 0)) {
599 dev_dbg(twl->dev, "%s: cable disconnected %i\n",
600 __func__, status);
601 pm_runtime_mark_last_busy(twl->dev);
602 pm_runtime_put_autosuspend(twl->dev);
603 twl->musb_mailbox_pending = true;
604 }
605 }
606 if (twl->musb_mailbox_pending) {
607 err = musb_mailbox(status);
608 if (!err)
609 twl->musb_mailbox_pending = false;
610 }
611
612 /* don't schedule during sleep - irq works right then */
613 if (status == MUSB_ID_GROUND && pm_runtime_active(twl->dev)) {
614 cancel_delayed_work(&twl->id_workaround_work);
615 schedule_delayed_work(&twl->id_workaround_work, HZ);
616 }
617
618 if (irq)
619 sysfs_notify(&twl->dev->kobj, NULL, "vbus");
620
621 return IRQ_HANDLED;
622 }
623
twl4030_id_workaround_work(struct work_struct * work)624 static void twl4030_id_workaround_work(struct work_struct *work)
625 {
626 struct twl4030_usb *twl = container_of(work, struct twl4030_usb,
627 id_workaround_work.work);
628
629 twl4030_usb_irq(0, twl);
630 }
631
twl4030_phy_init(struct phy * phy)632 static int twl4030_phy_init(struct phy *phy)
633 {
634 struct twl4030_usb *twl = phy_get_drvdata(phy);
635
636 pm_runtime_get_sync(twl->dev);
637 twl->linkstat = MUSB_UNKNOWN;
638 schedule_delayed_work(&twl->id_workaround_work, HZ);
639 pm_runtime_mark_last_busy(twl->dev);
640 pm_runtime_put_autosuspend(twl->dev);
641
642 return 0;
643 }
644
twl4030_set_peripheral(struct usb_otg * otg,struct usb_gadget * gadget)645 static int twl4030_set_peripheral(struct usb_otg *otg,
646 struct usb_gadget *gadget)
647 {
648 if (!otg)
649 return -ENODEV;
650
651 otg->gadget = gadget;
652 if (!gadget)
653 otg->state = OTG_STATE_UNDEFINED;
654
655 return 0;
656 }
657
twl4030_set_host(struct usb_otg * otg,struct usb_bus * host)658 static int twl4030_set_host(struct usb_otg *otg, struct usb_bus *host)
659 {
660 if (!otg)
661 return -ENODEV;
662
663 otg->host = host;
664 if (!host)
665 otg->state = OTG_STATE_UNDEFINED;
666
667 return 0;
668 }
669
670 static const struct phy_ops ops = {
671 .init = twl4030_phy_init,
672 .power_on = twl4030_phy_power_on,
673 .power_off = twl4030_phy_power_off,
674 .owner = THIS_MODULE,
675 };
676
677 static const struct dev_pm_ops twl4030_usb_pm_ops = {
678 SET_RUNTIME_PM_OPS(twl4030_usb_runtime_suspend,
679 twl4030_usb_runtime_resume, NULL)
680 SET_SYSTEM_SLEEP_PM_OPS(twl4030_usb_suspend, twl4030_usb_resume)
681 };
682
twl4030_usb_probe(struct platform_device * pdev)683 static int twl4030_usb_probe(struct platform_device *pdev)
684 {
685 struct twl4030_usb_data *pdata = dev_get_platdata(&pdev->dev);
686 struct twl4030_usb *twl;
687 struct phy *phy;
688 int status, err;
689 struct usb_otg *otg;
690 struct device_node *np = pdev->dev.of_node;
691 struct phy_provider *phy_provider;
692
693 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
694 if (!twl)
695 return -ENOMEM;
696
697 if (np)
698 of_property_read_u32(np, "usb_mode",
699 (enum twl4030_usb_mode *)&twl->usb_mode);
700 else if (pdata) {
701 twl->usb_mode = pdata->usb_mode;
702 } else {
703 dev_err(&pdev->dev, "twl4030 initialized without pdata\n");
704 return -EINVAL;
705 }
706
707 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
708 if (!otg)
709 return -ENOMEM;
710
711 twl->dev = &pdev->dev;
712 twl->irq = platform_get_irq(pdev, 0);
713 twl->vbus_supplied = false;
714 twl->linkstat = MUSB_UNKNOWN;
715 twl->musb_mailbox_pending = false;
716
717 twl->phy.dev = twl->dev;
718 twl->phy.label = "twl4030";
719 twl->phy.otg = otg;
720 twl->phy.type = USB_PHY_TYPE_USB2;
721
722 otg->usb_phy = &twl->phy;
723 otg->set_host = twl4030_set_host;
724 otg->set_peripheral = twl4030_set_peripheral;
725
726 phy = devm_phy_create(twl->dev, NULL, &ops);
727 if (IS_ERR(phy)) {
728 dev_dbg(&pdev->dev, "Failed to create PHY\n");
729 return PTR_ERR(phy);
730 }
731
732 phy_set_drvdata(phy, twl);
733
734 phy_provider = devm_of_phy_provider_register(twl->dev,
735 of_phy_simple_xlate);
736 if (IS_ERR(phy_provider))
737 return PTR_ERR(phy_provider);
738
739 /* init mutex for workqueue */
740 mutex_init(&twl->lock);
741
742 INIT_DELAYED_WORK(&twl->id_workaround_work, twl4030_id_workaround_work);
743
744 err = twl4030_usb_ldo_init(twl);
745 if (err) {
746 dev_err(&pdev->dev, "ldo init failed\n");
747 return err;
748 }
749 usb_add_phy_dev(&twl->phy);
750
751 platform_set_drvdata(pdev, twl);
752 if (device_create_file(&pdev->dev, &dev_attr_vbus))
753 dev_warn(&pdev->dev, "could not create sysfs file\n");
754
755 ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
756
757 pm_runtime_use_autosuspend(&pdev->dev);
758 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
759 pm_runtime_enable(&pdev->dev);
760 pm_runtime_get_sync(&pdev->dev);
761
762 /* Our job is to use irqs and status from the power module
763 * to keep the transceiver disabled when nothing's connected.
764 *
765 * FIXME we actually shouldn't start enabling it until the
766 * USB controller drivers have said they're ready, by calling
767 * set_host() and/or set_peripheral() ... OTG_capable boards
768 * need both handles, otherwise just one suffices.
769 */
770 status = devm_request_threaded_irq(twl->dev, twl->irq, NULL,
771 twl4030_usb_irq, IRQF_TRIGGER_FALLING |
772 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "twl4030_usb", twl);
773 if (status < 0) {
774 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
775 twl->irq, status);
776 return status;
777 }
778
779 if (pdata)
780 err = phy_create_lookup(phy, "usb", "musb-hdrc.0");
781 if (err)
782 return err;
783
784 pm_runtime_mark_last_busy(&pdev->dev);
785 pm_runtime_put_autosuspend(twl->dev);
786
787 dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
788 return 0;
789 }
790
twl4030_usb_remove(struct platform_device * pdev)791 static void twl4030_usb_remove(struct platform_device *pdev)
792 {
793 struct twl4030_usb *twl = platform_get_drvdata(pdev);
794 int val;
795
796 usb_remove_phy(&twl->phy);
797 pm_runtime_get_sync(twl->dev);
798 cancel_delayed_work_sync(&twl->id_workaround_work);
799 device_remove_file(twl->dev, &dev_attr_vbus);
800
801 /* set transceiver mode to power on defaults */
802 twl4030_usb_set_mode(twl, -1);
803
804 /* idle ulpi before powering off */
805 if (cable_present(twl->linkstat))
806 pm_runtime_put_noidle(twl->dev);
807 pm_runtime_mark_last_busy(twl->dev);
808 pm_runtime_dont_use_autosuspend(&pdev->dev);
809 pm_runtime_put_sync(twl->dev);
810 pm_runtime_disable(twl->dev);
811
812 /* autogate 60MHz ULPI clock,
813 * clear dpll clock request for i2c access,
814 * disable 32KHz
815 */
816 val = twl4030_usb_read(twl, PHY_CLK_CTRL);
817 if (val >= 0) {
818 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
819 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
820 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
821 }
822
823 /* disable complete OTG block */
824 twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
825 }
826
827 #ifdef CONFIG_OF
828 static const struct of_device_id twl4030_usb_id_table[] = {
829 { .compatible = "ti,twl4030-usb" },
830 {}
831 };
832 MODULE_DEVICE_TABLE(of, twl4030_usb_id_table);
833 #endif
834
835 static struct platform_driver twl4030_usb_driver = {
836 .probe = twl4030_usb_probe,
837 .remove_new = twl4030_usb_remove,
838 .driver = {
839 .name = "twl4030_usb",
840 .pm = &twl4030_usb_pm_ops,
841 .of_match_table = of_match_ptr(twl4030_usb_id_table),
842 },
843 };
844
twl4030_usb_init(void)845 static int __init twl4030_usb_init(void)
846 {
847 return platform_driver_register(&twl4030_usb_driver);
848 }
849 subsys_initcall(twl4030_usb_init);
850
twl4030_usb_exit(void)851 static void __exit twl4030_usb_exit(void)
852 {
853 platform_driver_unregister(&twl4030_usb_driver);
854 }
855 module_exit(twl4030_usb_exit);
856
857 MODULE_ALIAS("platform:twl4030_usb");
858 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
859 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
860 MODULE_LICENSE("GPL");
861