Loading...
Note: File does not exist in v3.1.
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * USB transceiver driver for AB8500 family chips
4 *
5 * Copyright (C) 2010-2013 ST-Ericsson AB
6 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
7 * Avinash Kumar <avinash.kumar@stericsson.com>
8 * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
9 */
10
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/usb/otg.h>
14#include <linux/slab.h>
15#include <linux/notifier.h>
16#include <linux/interrupt.h>
17#include <linux/delay.h>
18#include <linux/clk.h>
19#include <linux/err.h>
20#include <linux/mfd/abx500.h>
21#include <linux/mfd/abx500/ab8500.h>
22#include <linux/usb/musb-ux500.h>
23#include <linux/regulator/consumer.h>
24#include <linux/pinctrl/consumer.h>
25
26/* Bank AB8500_SYS_CTRL2_BLOCK */
27#define AB8500_MAIN_WD_CTRL_REG 0x01
28
29/* Bank AB8500_USB */
30#define AB8500_USB_LINE_STAT_REG 0x80
31#define AB8505_USB_LINE_STAT_REG 0x94
32#define AB8500_USB_PHY_CTRL_REG 0x8A
33
34/* Bank AB8500_DEVELOPMENT */
35#define AB8500_BANK12_ACCESS 0x00
36
37/* Bank AB8500_DEBUG */
38#define AB8500_USB_PHY_TUNE1 0x05
39#define AB8500_USB_PHY_TUNE2 0x06
40#define AB8500_USB_PHY_TUNE3 0x07
41
42/* Bank AB8500_INTERRUPT */
43#define AB8500_IT_SOURCE2_REG 0x01
44
45#define AB8500_BIT_OTG_STAT_ID (1 << 0)
46#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
47#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
48#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
49#define AB8500_BIT_WD_CTRL_KICK (1 << 1)
50#define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
51
52#define AB8500_WD_KICK_DELAY_US 100 /* usec */
53#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
54#define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
55
56/* Usb line status register */
57enum ab8500_usb_link_status {
58 USB_LINK_NOT_CONFIGURED_8500 = 0,
59 USB_LINK_STD_HOST_NC_8500,
60 USB_LINK_STD_HOST_C_NS_8500,
61 USB_LINK_STD_HOST_C_S_8500,
62 USB_LINK_HOST_CHG_NM_8500,
63 USB_LINK_HOST_CHG_HS_8500,
64 USB_LINK_HOST_CHG_HS_CHIRP_8500,
65 USB_LINK_DEDICATED_CHG_8500,
66 USB_LINK_ACA_RID_A_8500,
67 USB_LINK_ACA_RID_B_8500,
68 USB_LINK_ACA_RID_C_NM_8500,
69 USB_LINK_ACA_RID_C_HS_8500,
70 USB_LINK_ACA_RID_C_HS_CHIRP_8500,
71 USB_LINK_HM_IDGND_8500,
72 USB_LINK_RESERVED_8500,
73 USB_LINK_NOT_VALID_LINK_8500,
74};
75
76enum ab8505_usb_link_status {
77 USB_LINK_NOT_CONFIGURED_8505 = 0,
78 USB_LINK_STD_HOST_NC_8505,
79 USB_LINK_STD_HOST_C_NS_8505,
80 USB_LINK_STD_HOST_C_S_8505,
81 USB_LINK_CDP_8505,
82 USB_LINK_RESERVED0_8505,
83 USB_LINK_RESERVED1_8505,
84 USB_LINK_DEDICATED_CHG_8505,
85 USB_LINK_ACA_RID_A_8505,
86 USB_LINK_ACA_RID_B_8505,
87 USB_LINK_ACA_RID_C_NM_8505,
88 USB_LINK_RESERVED2_8505,
89 USB_LINK_RESERVED3_8505,
90 USB_LINK_HM_IDGND_8505,
91 USB_LINK_CHARGERPORT_NOT_OK_8505,
92 USB_LINK_CHARGER_DM_HIGH_8505,
93 USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
94 USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
95 USB_LINK_STD_UPSTREAM_8505,
96 USB_LINK_CHARGER_SE1_8505,
97 USB_LINK_CARKIT_CHGR_1_8505,
98 USB_LINK_CARKIT_CHGR_2_8505,
99 USB_LINK_ACA_DOCK_CHGR_8505,
100 USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
101 USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
102 USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
103 USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
104 USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
105};
106
107enum ab8500_usb_mode {
108 USB_IDLE = 0,
109 USB_PERIPHERAL,
110 USB_HOST,
111 USB_DEDICATED_CHG
112};
113
114/* Register USB_LINK_STATUS interrupt */
115#define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ (1 << 0)
116/* Register ID_WAKEUP_F interrupt */
117#define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ (1 << 1)
118/* Register VBUS_DET_F interrupt */
119#define AB8500_USB_FLAG_USE_VBUS_DET_IRQ (1 << 2)
120/* Driver is using the ab-iddet driver*/
121#define AB8500_USB_FLAG_USE_AB_IDDET (1 << 3)
122/* Enable setting regulators voltage */
123#define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE (1 << 4)
124
125struct ab8500_usb {
126 struct usb_phy phy;
127 struct device *dev;
128 struct ab8500 *ab8500;
129 unsigned vbus_draw;
130 struct work_struct phy_dis_work;
131 enum ab8500_usb_mode mode;
132 struct clk *sysclk;
133 struct regulator *v_ape;
134 struct regulator *v_musb;
135 struct regulator *v_ulpi;
136 int saved_v_ulpi;
137 int previous_link_status_state;
138 struct pinctrl *pinctrl;
139 struct pinctrl_state *pins_sleep;
140 bool enabled_charging_detection;
141 unsigned int flags;
142};
143
144static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
145{
146 return container_of(x, struct ab8500_usb, phy);
147}
148
149static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
150{
151 abx500_set_register_interruptible(ab->dev,
152 AB8500_SYS_CTRL2_BLOCK,
153 AB8500_MAIN_WD_CTRL_REG,
154 AB8500_BIT_WD_CTRL_ENABLE);
155
156 udelay(AB8500_WD_KICK_DELAY_US);
157
158 abx500_set_register_interruptible(ab->dev,
159 AB8500_SYS_CTRL2_BLOCK,
160 AB8500_MAIN_WD_CTRL_REG,
161 (AB8500_BIT_WD_CTRL_ENABLE
162 | AB8500_BIT_WD_CTRL_KICK));
163
164 udelay(AB8500_WD_V11_DISABLE_DELAY_US);
165
166 abx500_set_register_interruptible(ab->dev,
167 AB8500_SYS_CTRL2_BLOCK,
168 AB8500_MAIN_WD_CTRL_REG,
169 0);
170}
171
172static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
173{
174 int ret, volt;
175
176 ret = regulator_enable(ab->v_ape);
177 if (ret)
178 dev_err(ab->dev, "Failed to enable v-ape\n");
179
180 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
181 ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
182 if (ab->saved_v_ulpi < 0)
183 dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
184
185 ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
186 if (ret < 0)
187 dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
188 ret);
189
190 ret = regulator_set_load(ab->v_ulpi, 28000);
191 if (ret < 0)
192 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
193 ret);
194 }
195
196 ret = regulator_enable(ab->v_ulpi);
197 if (ret)
198 dev_err(ab->dev, "Failed to enable vddulpivio18\n");
199
200 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
201 volt = regulator_get_voltage(ab->v_ulpi);
202 if ((volt != 1300000) && (volt != 1350000))
203 dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
204 volt);
205 }
206
207 ret = regulator_enable(ab->v_musb);
208 if (ret)
209 dev_err(ab->dev, "Failed to enable musb_1v8\n");
210}
211
212static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
213{
214 int ret;
215
216 regulator_disable(ab->v_musb);
217
218 regulator_disable(ab->v_ulpi);
219
220 /* USB is not the only consumer of Vintcore, restore old settings */
221 if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
222 if (ab->saved_v_ulpi > 0) {
223 ret = regulator_set_voltage(ab->v_ulpi,
224 ab->saved_v_ulpi, ab->saved_v_ulpi);
225 if (ret < 0)
226 dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
227 ab->saved_v_ulpi, ret);
228 }
229
230 ret = regulator_set_load(ab->v_ulpi, 0);
231 if (ret < 0)
232 dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
233 ret);
234 }
235
236 regulator_disable(ab->v_ape);
237}
238
239static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
240{
241 /* Workaround for v2.0 bug # 31952 */
242 if (is_ab8500_2p0(ab->ab8500)) {
243 abx500_mask_and_set_register_interruptible(ab->dev,
244 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
245 bit, bit);
246 udelay(AB8500_V20_31952_DISABLE_DELAY_US);
247 }
248}
249
250static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
251{
252 u8 bit;
253 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
254 AB8500_BIT_PHY_CTRL_DEVICE_EN;
255
256 /* mux and configure USB pins to DEFAULT state */
257 ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
258 if (IS_ERR(ab->pinctrl))
259 dev_err(ab->dev, "could not get/set default pinstate\n");
260
261 if (clk_prepare_enable(ab->sysclk))
262 dev_err(ab->dev, "can't prepare/enable clock\n");
263
264 ab8500_usb_regulator_enable(ab);
265
266 abx500_mask_and_set_register_interruptible(ab->dev,
267 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
268 bit, bit);
269}
270
271static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
272{
273 u8 bit;
274 bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
275 AB8500_BIT_PHY_CTRL_DEVICE_EN;
276
277 ab8500_usb_wd_linkstatus(ab, bit);
278
279 abx500_mask_and_set_register_interruptible(ab->dev,
280 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
281 bit, 0);
282
283 /* Needed to disable the phy.*/
284 ab8500_usb_wd_workaround(ab);
285
286 clk_disable_unprepare(ab->sysclk);
287
288 ab8500_usb_regulator_disable(ab);
289
290 if (!IS_ERR(ab->pinctrl)) {
291 /* configure USB pins to SLEEP state */
292 ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
293 PINCTRL_STATE_SLEEP);
294
295 if (IS_ERR(ab->pins_sleep))
296 dev_dbg(ab->dev, "could not get sleep pinstate\n");
297 else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
298 dev_err(ab->dev, "could not set pins to sleep state\n");
299
300 /*
301 * as USB pins are shared with iddet, release them to allow
302 * iddet to request them
303 */
304 pinctrl_put(ab->pinctrl);
305 }
306}
307
308#define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_enable(ab, true)
309#define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_disable(ab, true)
310#define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_enable(ab, false)
311#define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_disable(ab, false)
312
313static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
314 enum ab8505_usb_link_status lsts)
315{
316 enum ux500_musb_vbus_id_status event = 0;
317
318 dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
319
320 /*
321 * Spurious link_status interrupts are seen at the time of
322 * disconnection of a device in RIDA state
323 */
324 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
325 (lsts == USB_LINK_STD_HOST_NC_8505))
326 return 0;
327
328 ab->previous_link_status_state = lsts;
329
330 switch (lsts) {
331 case USB_LINK_ACA_RID_B_8505:
332 event = UX500_MUSB_RIDB;
333 /* Fall through */
334 case USB_LINK_NOT_CONFIGURED_8505:
335 case USB_LINK_RESERVED0_8505:
336 case USB_LINK_RESERVED1_8505:
337 case USB_LINK_RESERVED2_8505:
338 case USB_LINK_RESERVED3_8505:
339 ab->mode = USB_IDLE;
340 ab->phy.otg->default_a = false;
341 ab->vbus_draw = 0;
342 if (event != UX500_MUSB_RIDB)
343 event = UX500_MUSB_NONE;
344 /*
345 * Fallback to default B_IDLE as nothing
346 * is connected
347 */
348 ab->phy.otg->state = OTG_STATE_B_IDLE;
349 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
350 break;
351
352 case USB_LINK_ACA_RID_C_NM_8505:
353 event = UX500_MUSB_RIDC;
354 /* Fall through */
355 case USB_LINK_STD_HOST_NC_8505:
356 case USB_LINK_STD_HOST_C_NS_8505:
357 case USB_LINK_STD_HOST_C_S_8505:
358 case USB_LINK_CDP_8505:
359 if (ab->mode == USB_IDLE) {
360 ab->mode = USB_PERIPHERAL;
361 ab8500_usb_peri_phy_en(ab);
362 atomic_notifier_call_chain(&ab->phy.notifier,
363 UX500_MUSB_PREPARE, &ab->vbus_draw);
364 usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
365 }
366 if (event != UX500_MUSB_RIDC)
367 event = UX500_MUSB_VBUS;
368 break;
369
370 case USB_LINK_ACA_RID_A_8505:
371 case USB_LINK_ACA_DOCK_CHGR_8505:
372 event = UX500_MUSB_RIDA;
373 /* Fall through */
374 case USB_LINK_HM_IDGND_8505:
375 if (ab->mode == USB_IDLE) {
376 ab->mode = USB_HOST;
377 ab8500_usb_host_phy_en(ab);
378 atomic_notifier_call_chain(&ab->phy.notifier,
379 UX500_MUSB_PREPARE, &ab->vbus_draw);
380 }
381 ab->phy.otg->default_a = true;
382 if (event != UX500_MUSB_RIDA)
383 event = UX500_MUSB_ID;
384 atomic_notifier_call_chain(&ab->phy.notifier,
385 event, &ab->vbus_draw);
386 break;
387
388 case USB_LINK_DEDICATED_CHG_8505:
389 ab->mode = USB_DEDICATED_CHG;
390 event = UX500_MUSB_CHARGER;
391 atomic_notifier_call_chain(&ab->phy.notifier,
392 event, &ab->vbus_draw);
393 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
394 break;
395
396 default:
397 break;
398 }
399
400 return 0;
401}
402
403static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
404 enum ab8500_usb_link_status lsts)
405{
406 enum ux500_musb_vbus_id_status event = 0;
407
408 dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
409
410 /*
411 * Spurious link_status interrupts are seen in case of a
412 * disconnection of a device in IDGND and RIDA stage
413 */
414 if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
415 (lsts == USB_LINK_STD_HOST_C_NS_8500 ||
416 lsts == USB_LINK_STD_HOST_NC_8500))
417 return 0;
418
419 if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
420 lsts == USB_LINK_STD_HOST_NC_8500)
421 return 0;
422
423 ab->previous_link_status_state = lsts;
424
425 switch (lsts) {
426 case USB_LINK_ACA_RID_B_8500:
427 event = UX500_MUSB_RIDB;
428 /* Fall through */
429 case USB_LINK_NOT_CONFIGURED_8500:
430 case USB_LINK_NOT_VALID_LINK_8500:
431 ab->mode = USB_IDLE;
432 ab->phy.otg->default_a = false;
433 ab->vbus_draw = 0;
434 if (event != UX500_MUSB_RIDB)
435 event = UX500_MUSB_NONE;
436 /* Fallback to default B_IDLE as nothing is connected */
437 ab->phy.otg->state = OTG_STATE_B_IDLE;
438 usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
439 break;
440
441 case USB_LINK_ACA_RID_C_NM_8500:
442 case USB_LINK_ACA_RID_C_HS_8500:
443 case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
444 event = UX500_MUSB_RIDC;
445 /* Fall through */
446 case USB_LINK_STD_HOST_NC_8500:
447 case USB_LINK_STD_HOST_C_NS_8500:
448 case USB_LINK_STD_HOST_C_S_8500:
449 case USB_LINK_HOST_CHG_NM_8500:
450 case USB_LINK_HOST_CHG_HS_8500:
451 case USB_LINK_HOST_CHG_HS_CHIRP_8500:
452 if (ab->mode == USB_IDLE) {
453 ab->mode = USB_PERIPHERAL;
454 ab8500_usb_peri_phy_en(ab);
455 atomic_notifier_call_chain(&ab->phy.notifier,
456 UX500_MUSB_PREPARE, &ab->vbus_draw);
457 usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
458 }
459 if (event != UX500_MUSB_RIDC)
460 event = UX500_MUSB_VBUS;
461 break;
462
463 case USB_LINK_ACA_RID_A_8500:
464 event = UX500_MUSB_RIDA;
465 /* Fall through */
466 case USB_LINK_HM_IDGND_8500:
467 if (ab->mode == USB_IDLE) {
468 ab->mode = USB_HOST;
469 ab8500_usb_host_phy_en(ab);
470 atomic_notifier_call_chain(&ab->phy.notifier,
471 UX500_MUSB_PREPARE, &ab->vbus_draw);
472 }
473 ab->phy.otg->default_a = true;
474 if (event != UX500_MUSB_RIDA)
475 event = UX500_MUSB_ID;
476 atomic_notifier_call_chain(&ab->phy.notifier,
477 event, &ab->vbus_draw);
478 break;
479
480 case USB_LINK_DEDICATED_CHG_8500:
481 ab->mode = USB_DEDICATED_CHG;
482 event = UX500_MUSB_CHARGER;
483 atomic_notifier_call_chain(&ab->phy.notifier,
484 event, &ab->vbus_draw);
485 usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
486 break;
487
488 case USB_LINK_RESERVED_8500:
489 break;
490 }
491
492 return 0;
493}
494
495/*
496 * Connection Sequence:
497 * 1. Link Status Interrupt
498 * 2. Enable AB clock
499 * 3. Enable AB regulators
500 * 4. Enable USB phy
501 * 5. Reset the musb controller
502 * 6. Switch the ULPI GPIO pins to fucntion mode
503 * 7. Enable the musb Peripheral5 clock
504 * 8. Restore MUSB context
505 */
506static int abx500_usb_link_status_update(struct ab8500_usb *ab)
507{
508 u8 reg;
509 int ret = 0;
510
511 if (is_ab8500(ab->ab8500)) {
512 enum ab8500_usb_link_status lsts;
513
514 ret = abx500_get_register_interruptible(ab->dev,
515 AB8500_USB, AB8500_USB_LINE_STAT_REG, ®);
516 if (ret < 0)
517 return ret;
518 lsts = (reg >> 3) & 0x0F;
519 ret = ab8500_usb_link_status_update(ab, lsts);
520 } else if (is_ab8505(ab->ab8500)) {
521 enum ab8505_usb_link_status lsts;
522
523 ret = abx500_get_register_interruptible(ab->dev,
524 AB8500_USB, AB8505_USB_LINE_STAT_REG, ®);
525 if (ret < 0)
526 return ret;
527 lsts = (reg >> 3) & 0x1F;
528 ret = ab8505_usb_link_status_update(ab, lsts);
529 }
530
531 return ret;
532}
533
534/*
535 * Disconnection Sequence:
536 * 1. Disconnect Interrupt
537 * 2. Disable regulators
538 * 3. Disable AB clock
539 * 4. Disable the Phy
540 * 5. Link Status Interrupt
541 * 6. Disable Musb Clock
542 */
543static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
544{
545 struct ab8500_usb *ab = (struct ab8500_usb *) data;
546 enum usb_phy_events event = USB_EVENT_NONE;
547
548 /* Link status will not be updated till phy is disabled. */
549 if (ab->mode == USB_HOST) {
550 ab->phy.otg->default_a = false;
551 ab->vbus_draw = 0;
552 atomic_notifier_call_chain(&ab->phy.notifier,
553 event, &ab->vbus_draw);
554 ab8500_usb_host_phy_dis(ab);
555 ab->mode = USB_IDLE;
556 }
557
558 if (ab->mode == USB_PERIPHERAL) {
559 atomic_notifier_call_chain(&ab->phy.notifier,
560 event, &ab->vbus_draw);
561 ab8500_usb_peri_phy_dis(ab);
562 atomic_notifier_call_chain(&ab->phy.notifier,
563 UX500_MUSB_CLEAN, &ab->vbus_draw);
564 ab->mode = USB_IDLE;
565 ab->phy.otg->default_a = false;
566 ab->vbus_draw = 0;
567 }
568
569 if (is_ab8500_2p0(ab->ab8500)) {
570 if (ab->mode == USB_DEDICATED_CHG) {
571 ab8500_usb_wd_linkstatus(ab,
572 AB8500_BIT_PHY_CTRL_DEVICE_EN);
573 abx500_mask_and_set_register_interruptible(ab->dev,
574 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
575 AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
576 }
577 }
578
579 return IRQ_HANDLED;
580}
581
582static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
583{
584 struct ab8500_usb *ab = (struct ab8500_usb *)data;
585
586 abx500_usb_link_status_update(ab);
587
588 return IRQ_HANDLED;
589}
590
591static void ab8500_usb_phy_disable_work(struct work_struct *work)
592{
593 struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
594 phy_dis_work);
595
596 if (!ab->phy.otg->host)
597 ab8500_usb_host_phy_dis(ab);
598
599 if (!ab->phy.otg->gadget)
600 ab8500_usb_peri_phy_dis(ab);
601}
602
603static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
604{
605 /* TODO */
606 return 0;
607}
608
609static int ab8500_usb_set_peripheral(struct usb_otg *otg,
610 struct usb_gadget *gadget)
611{
612 struct ab8500_usb *ab;
613
614 if (!otg)
615 return -ENODEV;
616
617 ab = phy_to_ab(otg->usb_phy);
618
619 ab->phy.otg->gadget = gadget;
620
621 /* Some drivers call this function in atomic context.
622 * Do not update ab8500 registers directly till this
623 * is fixed.
624 */
625
626 if ((ab->mode != USB_IDLE) && !gadget) {
627 ab->mode = USB_IDLE;
628 schedule_work(&ab->phy_dis_work);
629 }
630
631 return 0;
632}
633
634static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
635{
636 struct ab8500_usb *ab;
637
638 if (!otg)
639 return -ENODEV;
640
641 ab = phy_to_ab(otg->usb_phy);
642
643 ab->phy.otg->host = host;
644
645 /* Some drivers call this function in atomic context.
646 * Do not update ab8500 registers directly till this
647 * is fixed.
648 */
649
650 if ((ab->mode != USB_IDLE) && !host) {
651 ab->mode = USB_IDLE;
652 schedule_work(&ab->phy_dis_work);
653 }
654
655 return 0;
656}
657
658static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
659{
660 abx500_mask_and_set_register_interruptible(ab->dev,
661 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
662 AB8500_BIT_PHY_CTRL_DEVICE_EN,
663 AB8500_BIT_PHY_CTRL_DEVICE_EN);
664
665 udelay(100);
666
667 abx500_mask_and_set_register_interruptible(ab->dev,
668 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
669 AB8500_BIT_PHY_CTRL_DEVICE_EN,
670 0);
671
672 abx500_mask_and_set_register_interruptible(ab->dev,
673 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
674 AB8500_BIT_PHY_CTRL_HOST_EN,
675 AB8500_BIT_PHY_CTRL_HOST_EN);
676
677 udelay(100);
678
679 abx500_mask_and_set_register_interruptible(ab->dev,
680 AB8500_USB, AB8500_USB_PHY_CTRL_REG,
681 AB8500_BIT_PHY_CTRL_HOST_EN,
682 0);
683}
684
685static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
686{
687 int err;
688
689 ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
690 if (IS_ERR(ab->v_ape)) {
691 dev_err(ab->dev, "Could not get v-ape supply\n");
692 err = PTR_ERR(ab->v_ape);
693 return err;
694 }
695
696 ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
697 if (IS_ERR(ab->v_ulpi)) {
698 dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
699 err = PTR_ERR(ab->v_ulpi);
700 return err;
701 }
702
703 ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
704 if (IS_ERR(ab->v_musb)) {
705 dev_err(ab->dev, "Could not get musb_1v8 supply\n");
706 err = PTR_ERR(ab->v_musb);
707 return err;
708 }
709
710 return 0;
711}
712
713static int ab8500_usb_irq_setup(struct platform_device *pdev,
714 struct ab8500_usb *ab)
715{
716 int err;
717 int irq;
718
719 if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
720 irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
721 if (irq < 0)
722 return irq;
723 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
724 ab8500_usb_link_status_irq,
725 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
726 "usb-link-status", ab);
727 if (err < 0) {
728 dev_err(ab->dev, "request_irq failed for link status irq\n");
729 return err;
730 }
731 }
732
733 if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
734 irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
735 if (irq < 0)
736 return irq;
737 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
738 ab8500_usb_disconnect_irq,
739 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
740 "usb-id-fall", ab);
741 if (err < 0) {
742 dev_err(ab->dev, "request_irq failed for ID fall irq\n");
743 return err;
744 }
745 }
746
747 if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
748 irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
749 if (irq < 0)
750 return irq;
751 err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
752 ab8500_usb_disconnect_irq,
753 IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
754 "usb-vbus-fall", ab);
755 if (err < 0) {
756 dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
757 return err;
758 }
759 }
760
761 return 0;
762}
763
764static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
765{
766 int err;
767
768 /* Enable the PBT/Bank 0x12 access */
769 err = abx500_set_register_interruptible(ab->dev,
770 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
771 if (err < 0)
772 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
773 err);
774
775 err = abx500_set_register_interruptible(ab->dev,
776 AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
777 if (err < 0)
778 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
779 err);
780
781 err = abx500_set_register_interruptible(ab->dev,
782 AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
783 if (err < 0)
784 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
785 err);
786
787 err = abx500_set_register_interruptible(ab->dev,
788 AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
789 if (err < 0)
790 dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
791 err);
792
793 /* Switch to normal mode/disable Bank 0x12 access */
794 err = abx500_set_register_interruptible(ab->dev,
795 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
796 if (err < 0)
797 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
798 err);
799}
800
801static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
802{
803 int err;
804
805 /* Enable the PBT/Bank 0x12 access */
806 err = abx500_mask_and_set_register_interruptible(ab->dev,
807 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
808 0x01, 0x01);
809 if (err < 0)
810 dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
811 err);
812
813 err = abx500_mask_and_set_register_interruptible(ab->dev,
814 AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
815 0xC8, 0xC8);
816 if (err < 0)
817 dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
818 err);
819
820 err = abx500_mask_and_set_register_interruptible(ab->dev,
821 AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
822 0x60, 0x60);
823 if (err < 0)
824 dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
825 err);
826
827 err = abx500_mask_and_set_register_interruptible(ab->dev,
828 AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
829 0xFC, 0x80);
830
831 if (err < 0)
832 dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
833 err);
834
835 /* Switch to normal mode/disable Bank 0x12 access */
836 err = abx500_mask_and_set_register_interruptible(ab->dev,
837 AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
838 0x00, 0x00);
839 if (err < 0)
840 dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
841 err);
842}
843
844static int ab8500_usb_probe(struct platform_device *pdev)
845{
846 struct ab8500_usb *ab;
847 struct ab8500 *ab8500;
848 struct usb_otg *otg;
849 int err;
850 int rev;
851
852 ab8500 = dev_get_drvdata(pdev->dev.parent);
853 rev = abx500_get_chip_id(&pdev->dev);
854
855 if (is_ab8500_1p1_or_earlier(ab8500)) {
856 dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
857 return -ENODEV;
858 }
859
860 ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
861 if (!ab)
862 return -ENOMEM;
863
864 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
865 if (!otg)
866 return -ENOMEM;
867
868 ab->dev = &pdev->dev;
869 ab->ab8500 = ab8500;
870 ab->phy.dev = ab->dev;
871 ab->phy.otg = otg;
872 ab->phy.label = "ab8500";
873 ab->phy.set_suspend = ab8500_usb_set_suspend;
874 ab->phy.otg->state = OTG_STATE_UNDEFINED;
875
876 otg->usb_phy = &ab->phy;
877 otg->set_host = ab8500_usb_set_host;
878 otg->set_peripheral = ab8500_usb_set_peripheral;
879
880 if (is_ab8500(ab->ab8500)) {
881 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
882 AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
883 AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
884 AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
885 } else if (is_ab8505(ab->ab8500)) {
886 ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
887 AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
888 AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
889 AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
890 }
891
892 /* Disable regulator voltage setting for AB8500 <= v2.0 */
893 if (is_ab8500_2p0_or_earlier(ab->ab8500))
894 ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
895
896 platform_set_drvdata(pdev, ab);
897
898 /* all: Disable phy when called from set_host and set_peripheral */
899 INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
900
901 err = ab8500_usb_regulator_get(ab);
902 if (err)
903 return err;
904
905 ab->sysclk = devm_clk_get(ab->dev, "sysclk");
906 if (IS_ERR(ab->sysclk)) {
907 dev_err(ab->dev, "Could not get sysclk.\n");
908 return PTR_ERR(ab->sysclk);
909 }
910
911 err = ab8500_usb_irq_setup(pdev, ab);
912 if (err < 0)
913 return err;
914
915 err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
916 if (err) {
917 dev_err(&pdev->dev, "Can't register transceiver\n");
918 return err;
919 }
920
921 if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
922 /* Phy tuning values for AB8500 > v2.0 */
923 ab8500_usb_set_ab8500_tuning_values(ab);
924 else if (is_ab8505(ab->ab8500))
925 /* Phy tuning values for AB8505 */
926 ab8500_usb_set_ab8505_tuning_values(ab);
927
928 /* Needed to enable ID detection. */
929 ab8500_usb_wd_workaround(ab);
930
931 /*
932 * This is required for usb-link-status to work properly when a
933 * cable is connected at boot time.
934 */
935 ab8500_usb_restart_phy(ab);
936
937 abx500_usb_link_status_update(ab);
938
939 dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
940
941 return 0;
942}
943
944static int ab8500_usb_remove(struct platform_device *pdev)
945{
946 struct ab8500_usb *ab = platform_get_drvdata(pdev);
947
948 cancel_work_sync(&ab->phy_dis_work);
949
950 usb_remove_phy(&ab->phy);
951
952 if (ab->mode == USB_HOST)
953 ab8500_usb_host_phy_dis(ab);
954 else if (ab->mode == USB_PERIPHERAL)
955 ab8500_usb_peri_phy_dis(ab);
956
957 return 0;
958}
959
960static const struct platform_device_id ab8500_usb_devtype[] = {
961 { .name = "ab8500-usb", },
962 { /* sentinel */ }
963};
964MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
965
966static struct platform_driver ab8500_usb_driver = {
967 .probe = ab8500_usb_probe,
968 .remove = ab8500_usb_remove,
969 .id_table = ab8500_usb_devtype,
970 .driver = {
971 .name = "abx5x0-usb",
972 },
973};
974
975static int __init ab8500_usb_init(void)
976{
977 return platform_driver_register(&ab8500_usb_driver);
978}
979subsys_initcall(ab8500_usb_init);
980
981static void __exit ab8500_usb_exit(void)
982{
983 platform_driver_unregister(&ab8500_usb_driver);
984}
985module_exit(ab8500_usb_exit);
986
987MODULE_AUTHOR("ST-Ericsson AB");
988MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
989MODULE_LICENSE("GPL");