xref: /openbmc/linux/drivers/usb/phy/phy-ab8500-usb.c (revision c819e2cf)
1 /*
2  * USB transceiver driver for AB8500 family chips
3  *
4  * Copyright (C) 2010-2013 ST-Ericsson AB
5  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
6  * Avinash Kumar <avinash.kumar@stericsson.com>
7  * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  *
23  */
24 
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/usb/otg.h>
28 #include <linux/slab.h>
29 #include <linux/notifier.h>
30 #include <linux/interrupt.h>
31 #include <linux/delay.h>
32 #include <linux/clk.h>
33 #include <linux/err.h>
34 #include <linux/mfd/abx500.h>
35 #include <linux/mfd/abx500/ab8500.h>
36 #include <linux/usb/musb-ux500.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/pinctrl/consumer.h>
39 
40 /* Bank AB8500_SYS_CTRL2_BLOCK */
41 #define AB8500_MAIN_WD_CTRL_REG 0x01
42 
43 /* Bank AB8500_USB */
44 #define AB8500_USB_LINE_STAT_REG 0x80
45 #define AB8505_USB_LINE_STAT_REG 0x94
46 #define AB8540_USB_LINK_STAT_REG 0x94
47 #define AB9540_USB_LINK_STAT_REG 0x94
48 #define AB8540_USB_OTG_CTL_REG 0x87
49 #define AB8500_USB_PHY_CTRL_REG 0x8A
50 #define AB8540_VBUS_CTRL_REG 0x82
51 
52 /* Bank AB8500_DEVELOPMENT */
53 #define AB8500_BANK12_ACCESS 0x00
54 
55 /* Bank AB8500_DEBUG */
56 #define AB8540_DEBUG 0x32
57 #define AB8500_USB_PHY_TUNE1 0x05
58 #define AB8500_USB_PHY_TUNE2 0x06
59 #define AB8500_USB_PHY_TUNE3 0x07
60 
61 /* Bank AB8500_INTERRUPT */
62 #define AB8500_IT_SOURCE2_REG 0x01
63 
64 #define AB8500_BIT_OTG_STAT_ID (1 << 0)
65 #define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
66 #define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
67 #define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
68 #define AB8500_BIT_WD_CTRL_KICK (1 << 1)
69 #define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
70 #define AB8540_BIT_OTG_CTL_VBUS_VALID_ENA (1 << 0)
71 #define AB8540_BIT_OTG_CTL_ID_HOST_ENA (1 << 1)
72 #define AB8540_BIT_OTG_CTL_ID_DEV_ENA (1 << 5)
73 #define AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA (1 << 0)
74 
75 #define AB8500_WD_KICK_DELAY_US 100 /* usec */
76 #define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
77 #define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
78 
79 /* Usb line status register */
80 enum ab8500_usb_link_status {
81 	USB_LINK_NOT_CONFIGURED_8500 = 0,
82 	USB_LINK_STD_HOST_NC_8500,
83 	USB_LINK_STD_HOST_C_NS_8500,
84 	USB_LINK_STD_HOST_C_S_8500,
85 	USB_LINK_HOST_CHG_NM_8500,
86 	USB_LINK_HOST_CHG_HS_8500,
87 	USB_LINK_HOST_CHG_HS_CHIRP_8500,
88 	USB_LINK_DEDICATED_CHG_8500,
89 	USB_LINK_ACA_RID_A_8500,
90 	USB_LINK_ACA_RID_B_8500,
91 	USB_LINK_ACA_RID_C_NM_8500,
92 	USB_LINK_ACA_RID_C_HS_8500,
93 	USB_LINK_ACA_RID_C_HS_CHIRP_8500,
94 	USB_LINK_HM_IDGND_8500,
95 	USB_LINK_RESERVED_8500,
96 	USB_LINK_NOT_VALID_LINK_8500,
97 };
98 
99 enum ab8505_usb_link_status {
100 	USB_LINK_NOT_CONFIGURED_8505 = 0,
101 	USB_LINK_STD_HOST_NC_8505,
102 	USB_LINK_STD_HOST_C_NS_8505,
103 	USB_LINK_STD_HOST_C_S_8505,
104 	USB_LINK_CDP_8505,
105 	USB_LINK_RESERVED0_8505,
106 	USB_LINK_RESERVED1_8505,
107 	USB_LINK_DEDICATED_CHG_8505,
108 	USB_LINK_ACA_RID_A_8505,
109 	USB_LINK_ACA_RID_B_8505,
110 	USB_LINK_ACA_RID_C_NM_8505,
111 	USB_LINK_RESERVED2_8505,
112 	USB_LINK_RESERVED3_8505,
113 	USB_LINK_HM_IDGND_8505,
114 	USB_LINK_CHARGERPORT_NOT_OK_8505,
115 	USB_LINK_CHARGER_DM_HIGH_8505,
116 	USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
117 	USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
118 	USB_LINK_STD_UPSTREAM_8505,
119 	USB_LINK_CHARGER_SE1_8505,
120 	USB_LINK_CARKIT_CHGR_1_8505,
121 	USB_LINK_CARKIT_CHGR_2_8505,
122 	USB_LINK_ACA_DOCK_CHGR_8505,
123 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
124 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
125 	USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
126 	USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
127 	USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
128 };
129 
130 enum ab8540_usb_link_status {
131 	USB_LINK_NOT_CONFIGURED_8540 = 0,
132 	USB_LINK_STD_HOST_NC_8540,
133 	USB_LINK_STD_HOST_C_NS_8540,
134 	USB_LINK_STD_HOST_C_S_8540,
135 	USB_LINK_CDP_8540,
136 	USB_LINK_RESERVED0_8540,
137 	USB_LINK_RESERVED1_8540,
138 	USB_LINK_DEDICATED_CHG_8540,
139 	USB_LINK_ACA_RID_A_8540,
140 	USB_LINK_ACA_RID_B_8540,
141 	USB_LINK_ACA_RID_C_NM_8540,
142 	USB_LINK_RESERVED2_8540,
143 	USB_LINK_RESERVED3_8540,
144 	USB_LINK_HM_IDGND_8540,
145 	USB_LINK_CHARGERPORT_NOT_OK_8540,
146 	USB_LINK_CHARGER_DM_HIGH_8540,
147 	USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540,
148 	USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540,
149 	USB_LINK_STD_UPSTREAM_8540,
150 	USB_LINK_CHARGER_SE1_8540,
151 	USB_LINK_CARKIT_CHGR_1_8540,
152 	USB_LINK_CARKIT_CHGR_2_8540,
153 	USB_LINK_ACA_DOCK_CHGR_8540,
154 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8540,
155 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8540,
156 	USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8540,
157 	USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8540,
158 	USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8540
159 };
160 
161 enum ab9540_usb_link_status {
162 	USB_LINK_NOT_CONFIGURED_9540 = 0,
163 	USB_LINK_STD_HOST_NC_9540,
164 	USB_LINK_STD_HOST_C_NS_9540,
165 	USB_LINK_STD_HOST_C_S_9540,
166 	USB_LINK_CDP_9540,
167 	USB_LINK_RESERVED0_9540,
168 	USB_LINK_RESERVED1_9540,
169 	USB_LINK_DEDICATED_CHG_9540,
170 	USB_LINK_ACA_RID_A_9540,
171 	USB_LINK_ACA_RID_B_9540,
172 	USB_LINK_ACA_RID_C_NM_9540,
173 	USB_LINK_RESERVED2_9540,
174 	USB_LINK_RESERVED3_9540,
175 	USB_LINK_HM_IDGND_9540,
176 	USB_LINK_CHARGERPORT_NOT_OK_9540,
177 	USB_LINK_CHARGER_DM_HIGH_9540,
178 	USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540,
179 	USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540,
180 	USB_LINK_STD_UPSTREAM_9540,
181 	USB_LINK_CHARGER_SE1_9540,
182 	USB_LINK_CARKIT_CHGR_1_9540,
183 	USB_LINK_CARKIT_CHGR_2_9540,
184 	USB_LINK_ACA_DOCK_CHGR_9540,
185 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_9540,
186 	USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_9540,
187 	USB_LINK_SAMSUNG_UART_CBL_PHY_EN_9540,
188 	USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_9540,
189 	USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_9540
190 };
191 
192 enum ab8500_usb_mode {
193 	USB_IDLE = 0,
194 	USB_PERIPHERAL,
195 	USB_HOST,
196 	USB_DEDICATED_CHG
197 };
198 
199 /* Register USB_LINK_STATUS interrupt */
200 #define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ	(1 << 0)
201 /* Register ID_WAKEUP_F interrupt */
202 #define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ	(1 << 1)
203 /* Register VBUS_DET_F interrupt */
204 #define AB8500_USB_FLAG_USE_VBUS_DET_IRQ	(1 << 2)
205 /* Driver is using the ab-iddet driver*/
206 #define AB8500_USB_FLAG_USE_AB_IDDET		(1 << 3)
207 /* Enable setting regulators voltage */
208 #define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE	(1 << 4)
209 /* Enable the check_vbus_status workaround */
210 #define AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS	(1 << 5)
211 /* Enable the vbus host workaround */
212 #define AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK	(1 << 6)
213 
214 struct ab8500_usb {
215 	struct usb_phy phy;
216 	struct device *dev;
217 	struct ab8500 *ab8500;
218 	unsigned vbus_draw;
219 	struct work_struct phy_dis_work;
220 	struct work_struct vbus_event_work;
221 	enum ab8500_usb_mode mode;
222 	struct clk *sysclk;
223 	struct regulator *v_ape;
224 	struct regulator *v_musb;
225 	struct regulator *v_ulpi;
226 	int saved_v_ulpi;
227 	int previous_link_status_state;
228 	struct pinctrl *pinctrl;
229 	struct pinctrl_state *pins_sleep;
230 	bool enabled_charging_detection;
231 	unsigned int flags;
232 };
233 
234 static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
235 {
236 	return container_of(x, struct ab8500_usb, phy);
237 }
238 
239 static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
240 {
241 	abx500_set_register_interruptible(ab->dev,
242 		AB8500_SYS_CTRL2_BLOCK,
243 		AB8500_MAIN_WD_CTRL_REG,
244 		AB8500_BIT_WD_CTRL_ENABLE);
245 
246 	udelay(AB8500_WD_KICK_DELAY_US);
247 
248 	abx500_set_register_interruptible(ab->dev,
249 		AB8500_SYS_CTRL2_BLOCK,
250 		AB8500_MAIN_WD_CTRL_REG,
251 		(AB8500_BIT_WD_CTRL_ENABLE
252 		| AB8500_BIT_WD_CTRL_KICK));
253 
254 	udelay(AB8500_WD_V11_DISABLE_DELAY_US);
255 
256 	abx500_set_register_interruptible(ab->dev,
257 		AB8500_SYS_CTRL2_BLOCK,
258 		AB8500_MAIN_WD_CTRL_REG,
259 		0);
260 }
261 
262 static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
263 {
264 	int ret, volt;
265 
266 	ret = regulator_enable(ab->v_ape);
267 	if (ret)
268 		dev_err(ab->dev, "Failed to enable v-ape\n");
269 
270 	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
271 		ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
272 		if (ab->saved_v_ulpi < 0)
273 			dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
274 
275 		ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
276 		if (ret < 0)
277 			dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
278 					ret);
279 
280 		ret = regulator_set_optimum_mode(ab->v_ulpi, 28000);
281 		if (ret < 0)
282 			dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
283 					ret);
284 	}
285 
286 	ret = regulator_enable(ab->v_ulpi);
287 	if (ret)
288 		dev_err(ab->dev, "Failed to enable vddulpivio18\n");
289 
290 	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
291 		volt = regulator_get_voltage(ab->v_ulpi);
292 		if ((volt != 1300000) && (volt != 1350000))
293 			dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
294 					volt);
295 	}
296 
297 	ret = regulator_enable(ab->v_musb);
298 	if (ret)
299 		dev_err(ab->dev, "Failed to enable musb_1v8\n");
300 }
301 
302 static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
303 {
304 	int ret;
305 
306 	regulator_disable(ab->v_musb);
307 
308 	regulator_disable(ab->v_ulpi);
309 
310 	/* USB is not the only consumer of Vintcore, restore old settings */
311 	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
312 		if (ab->saved_v_ulpi > 0) {
313 			ret = regulator_set_voltage(ab->v_ulpi,
314 					ab->saved_v_ulpi, ab->saved_v_ulpi);
315 			if (ret < 0)
316 				dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
317 						ab->saved_v_ulpi, ret);
318 		}
319 
320 		ret = regulator_set_optimum_mode(ab->v_ulpi, 0);
321 		if (ret < 0)
322 			dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
323 					ret);
324 	}
325 
326 	regulator_disable(ab->v_ape);
327 }
328 
329 static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
330 {
331 	/* Workaround for v2.0 bug # 31952 */
332 	if (is_ab8500_2p0(ab->ab8500)) {
333 		abx500_mask_and_set_register_interruptible(ab->dev,
334 				AB8500_USB, AB8500_USB_PHY_CTRL_REG,
335 				bit, bit);
336 		udelay(AB8500_V20_31952_DISABLE_DELAY_US);
337 	}
338 }
339 
340 static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
341 {
342 	u8 bit;
343 	bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
344 		AB8500_BIT_PHY_CTRL_DEVICE_EN;
345 
346 	/* mux and configure USB pins to DEFAULT state */
347 	ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
348 	if (IS_ERR(ab->pinctrl))
349 		dev_err(ab->dev, "could not get/set default pinstate\n");
350 
351 	if (clk_prepare_enable(ab->sysclk))
352 		dev_err(ab->dev, "can't prepare/enable clock\n");
353 
354 	ab8500_usb_regulator_enable(ab);
355 
356 	abx500_mask_and_set_register_interruptible(ab->dev,
357 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
358 			bit, bit);
359 
360 	if (ab->flags & AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK) {
361 		if (sel_host)
362 			abx500_set_register_interruptible(ab->dev,
363 					AB8500_USB, AB8540_USB_OTG_CTL_REG,
364 					AB8540_BIT_OTG_CTL_VBUS_VALID_ENA |
365 					AB8540_BIT_OTG_CTL_ID_HOST_ENA |
366 					AB8540_BIT_OTG_CTL_ID_DEV_ENA);
367 	}
368 }
369 
370 static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
371 {
372 	u8 bit;
373 	bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
374 		AB8500_BIT_PHY_CTRL_DEVICE_EN;
375 
376 	ab8500_usb_wd_linkstatus(ab, bit);
377 
378 	abx500_mask_and_set_register_interruptible(ab->dev,
379 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
380 			bit, 0);
381 
382 	/* Needed to disable the phy.*/
383 	ab8500_usb_wd_workaround(ab);
384 
385 	clk_disable_unprepare(ab->sysclk);
386 
387 	ab8500_usb_regulator_disable(ab);
388 
389 	if (!IS_ERR(ab->pinctrl)) {
390 		/* configure USB pins to SLEEP state */
391 		ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
392 				PINCTRL_STATE_SLEEP);
393 
394 		if (IS_ERR(ab->pins_sleep))
395 			dev_dbg(ab->dev, "could not get sleep pinstate\n");
396 		else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
397 			dev_err(ab->dev, "could not set pins to sleep state\n");
398 
399 		/*
400 		 * as USB pins are shared with iddet, release them to allow
401 		 * iddet to request them
402 		 */
403 		pinctrl_put(ab->pinctrl);
404 	}
405 }
406 
407 #define ab8500_usb_host_phy_en(ab)	ab8500_usb_phy_enable(ab, true)
408 #define ab8500_usb_host_phy_dis(ab)	ab8500_usb_phy_disable(ab, true)
409 #define ab8500_usb_peri_phy_en(ab)	ab8500_usb_phy_enable(ab, false)
410 #define ab8500_usb_peri_phy_dis(ab)	ab8500_usb_phy_disable(ab, false)
411 
412 static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
413 		enum ab9540_usb_link_status lsts)
414 {
415 	enum ux500_musb_vbus_id_status event = 0;
416 
417 	dev_dbg(ab->dev, "ab9540_usb_link_status_update %d\n", lsts);
418 
419 	if (ab->previous_link_status_state == USB_LINK_HM_IDGND_9540 &&
420 			(lsts == USB_LINK_STD_HOST_C_NS_9540 ||
421 			 lsts == USB_LINK_STD_HOST_NC_9540))
422 		return 0;
423 
424 	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_9540 &&
425 			(lsts == USB_LINK_STD_HOST_NC_9540))
426 		return 0;
427 
428 	ab->previous_link_status_state = lsts;
429 
430 	switch (lsts) {
431 	case USB_LINK_ACA_RID_B_9540:
432 		event = UX500_MUSB_RIDB;
433 	case USB_LINK_NOT_CONFIGURED_9540:
434 	case USB_LINK_RESERVED0_9540:
435 	case USB_LINK_RESERVED1_9540:
436 	case USB_LINK_RESERVED2_9540:
437 	case USB_LINK_RESERVED3_9540:
438 		if (ab->mode == USB_PERIPHERAL)
439 			atomic_notifier_call_chain(&ab->phy.notifier,
440 					UX500_MUSB_CLEAN, &ab->vbus_draw);
441 		ab->mode = USB_IDLE;
442 		ab->phy.otg->default_a = false;
443 		ab->vbus_draw = 0;
444 		if (event != UX500_MUSB_RIDB)
445 			event = UX500_MUSB_NONE;
446 		/* Fallback to default B_IDLE as nothing is connected. */
447 		ab->phy.otg->state = OTG_STATE_B_IDLE;
448 		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
449 		break;
450 
451 	case USB_LINK_ACA_RID_C_NM_9540:
452 		event = UX500_MUSB_RIDC;
453 	case USB_LINK_STD_HOST_NC_9540:
454 	case USB_LINK_STD_HOST_C_NS_9540:
455 	case USB_LINK_STD_HOST_C_S_9540:
456 	case USB_LINK_CDP_9540:
457 		if (ab->mode == USB_HOST) {
458 			ab->mode = USB_PERIPHERAL;
459 			ab8500_usb_host_phy_dis(ab);
460 			ab8500_usb_peri_phy_en(ab);
461 			atomic_notifier_call_chain(&ab->phy.notifier,
462 					UX500_MUSB_PREPARE, &ab->vbus_draw);
463 			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
464 		}
465 		if (ab->mode == USB_IDLE) {
466 			ab->mode = USB_PERIPHERAL;
467 			ab8500_usb_peri_phy_en(ab);
468 			atomic_notifier_call_chain(&ab->phy.notifier,
469 					UX500_MUSB_PREPARE, &ab->vbus_draw);
470 			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
471 		}
472 		if (event != UX500_MUSB_RIDC)
473 			event = UX500_MUSB_VBUS;
474 		break;
475 
476 	case USB_LINK_ACA_RID_A_9540:
477 		event = UX500_MUSB_RIDA;
478 	case USB_LINK_HM_IDGND_9540:
479 	case USB_LINK_STD_UPSTREAM_9540:
480 		if (ab->mode == USB_PERIPHERAL) {
481 			ab->mode = USB_HOST;
482 			ab8500_usb_peri_phy_dis(ab);
483 			ab8500_usb_host_phy_en(ab);
484 			atomic_notifier_call_chain(&ab->phy.notifier,
485 					UX500_MUSB_PREPARE, &ab->vbus_draw);
486 		}
487 		if (ab->mode == USB_IDLE) {
488 			ab->mode = USB_HOST;
489 			ab8500_usb_host_phy_en(ab);
490 			atomic_notifier_call_chain(&ab->phy.notifier,
491 					UX500_MUSB_PREPARE, &ab->vbus_draw);
492 		}
493 		ab->phy.otg->default_a = true;
494 		if (event != UX500_MUSB_RIDA)
495 			event = UX500_MUSB_ID;
496 
497 		atomic_notifier_call_chain(&ab->phy.notifier,
498 				event, &ab->vbus_draw);
499 		break;
500 
501 	case USB_LINK_DEDICATED_CHG_9540:
502 		ab->mode = USB_DEDICATED_CHG;
503 		event = UX500_MUSB_CHARGER;
504 		atomic_notifier_call_chain(&ab->phy.notifier,
505 				event, &ab->vbus_draw);
506 		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
507 		break;
508 
509 	case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540:
510 	case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_9540:
511 		if (!(is_ab9540_2p0_or_earlier(ab->ab8500))) {
512 			event = UX500_MUSB_NONE;
513 			if (ab->mode == USB_HOST) {
514 				ab->phy.otg->default_a = false;
515 				ab->vbus_draw = 0;
516 				atomic_notifier_call_chain(&ab->phy.notifier,
517 						event, &ab->vbus_draw);
518 				ab8500_usb_host_phy_dis(ab);
519 				ab->mode = USB_IDLE;
520 			}
521 			if (ab->mode == USB_PERIPHERAL) {
522 				atomic_notifier_call_chain(&ab->phy.notifier,
523 						event, &ab->vbus_draw);
524 				ab8500_usb_peri_phy_dis(ab);
525 				atomic_notifier_call_chain(&ab->phy.notifier,
526 						UX500_MUSB_CLEAN,
527 						&ab->vbus_draw);
528 				ab->mode = USB_IDLE;
529 				ab->phy.otg->default_a = false;
530 				ab->vbus_draw = 0;
531 				usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
532 			}
533 		}
534 		break;
535 
536 	default:
537 		break;
538 	}
539 
540 	return 0;
541 }
542 
543 static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
544 		enum ab8540_usb_link_status lsts)
545 {
546 	enum ux500_musb_vbus_id_status event = 0;
547 
548 	dev_dbg(ab->dev, "ab8540_usb_link_status_update %d\n", lsts);
549 
550 	if (ab->enabled_charging_detection) {
551 		/* Disable USB Charger detection */
552 		abx500_mask_and_set_register_interruptible(ab->dev,
553 				AB8500_USB, AB8540_VBUS_CTRL_REG,
554 				AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA, 0x00);
555 		ab->enabled_charging_detection = false;
556 	}
557 
558 	/*
559 	 * Spurious link_status interrupts are seen in case of a
560 	 * disconnection of a device in IDGND and RIDA stage
561 	 */
562 	if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8540 &&
563 			(lsts == USB_LINK_STD_HOST_C_NS_8540 ||
564 			 lsts == USB_LINK_STD_HOST_NC_8540))
565 		return 0;
566 
567 	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8540 &&
568 			(lsts == USB_LINK_STD_HOST_NC_8540))
569 		return 0;
570 
571 	ab->previous_link_status_state = lsts;
572 
573 	switch (lsts) {
574 	case USB_LINK_ACA_RID_B_8540:
575 		event = UX500_MUSB_RIDB;
576 	case USB_LINK_NOT_CONFIGURED_8540:
577 	case USB_LINK_RESERVED0_8540:
578 	case USB_LINK_RESERVED1_8540:
579 	case USB_LINK_RESERVED2_8540:
580 	case USB_LINK_RESERVED3_8540:
581 		ab->mode = USB_IDLE;
582 		ab->phy.otg->default_a = false;
583 		ab->vbus_draw = 0;
584 		if (event != UX500_MUSB_RIDB)
585 			event = UX500_MUSB_NONE;
586 		/*
587 		 * Fallback to default B_IDLE as nothing
588 		 * is connected
589 		 */
590 		ab->phy.otg->state = OTG_STATE_B_IDLE;
591 		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
592 		break;
593 
594 	case USB_LINK_ACA_RID_C_NM_8540:
595 		event = UX500_MUSB_RIDC;
596 	case USB_LINK_STD_HOST_NC_8540:
597 	case USB_LINK_STD_HOST_C_NS_8540:
598 	case USB_LINK_STD_HOST_C_S_8540:
599 	case USB_LINK_CDP_8540:
600 		if (ab->mode == USB_IDLE) {
601 			ab->mode = USB_PERIPHERAL;
602 			ab8500_usb_peri_phy_en(ab);
603 			atomic_notifier_call_chain(&ab->phy.notifier,
604 					UX500_MUSB_PREPARE, &ab->vbus_draw);
605 			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
606 		}
607 		if (event != UX500_MUSB_RIDC)
608 			event = UX500_MUSB_VBUS;
609 		break;
610 
611 	case USB_LINK_ACA_RID_A_8540:
612 	case USB_LINK_ACA_DOCK_CHGR_8540:
613 		event = UX500_MUSB_RIDA;
614 	case USB_LINK_HM_IDGND_8540:
615 	case USB_LINK_STD_UPSTREAM_8540:
616 		if (ab->mode == USB_IDLE) {
617 			ab->mode = USB_HOST;
618 			ab8500_usb_host_phy_en(ab);
619 			atomic_notifier_call_chain(&ab->phy.notifier,
620 					UX500_MUSB_PREPARE, &ab->vbus_draw);
621 		}
622 		ab->phy.otg->default_a = true;
623 		if (event != UX500_MUSB_RIDA)
624 			event = UX500_MUSB_ID;
625 		atomic_notifier_call_chain(&ab->phy.notifier,
626 				event, &ab->vbus_draw);
627 		break;
628 
629 	case USB_LINK_DEDICATED_CHG_8540:
630 		ab->mode = USB_DEDICATED_CHG;
631 		event = UX500_MUSB_CHARGER;
632 		atomic_notifier_call_chain(&ab->phy.notifier,
633 				event, &ab->vbus_draw);
634 		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
635 		break;
636 
637 	case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540:
638 	case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540:
639 		event = UX500_MUSB_NONE;
640 		if (ab->mode == USB_HOST) {
641 			ab->phy.otg->default_a = false;
642 			ab->vbus_draw = 0;
643 			atomic_notifier_call_chain(&ab->phy.notifier,
644 					event, &ab->vbus_draw);
645 			ab8500_usb_host_phy_dis(ab);
646 			ab->mode = USB_IDLE;
647 		}
648 		if (ab->mode == USB_PERIPHERAL) {
649 			atomic_notifier_call_chain(&ab->phy.notifier,
650 					event, &ab->vbus_draw);
651 			ab8500_usb_peri_phy_dis(ab);
652 			atomic_notifier_call_chain(&ab->phy.notifier,
653 					UX500_MUSB_CLEAN, &ab->vbus_draw);
654 			ab->mode = USB_IDLE;
655 			ab->phy.otg->default_a = false;
656 			ab->vbus_draw = 0;
657 		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
658 		}
659 		break;
660 
661 	default:
662 		event = UX500_MUSB_NONE;
663 		break;
664 	}
665 
666 	return 0;
667 }
668 
669 static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
670 		enum ab8505_usb_link_status lsts)
671 {
672 	enum ux500_musb_vbus_id_status event = 0;
673 
674 	dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
675 
676 	/*
677 	 * Spurious link_status interrupts are seen at the time of
678 	 * disconnection of a device in RIDA state
679 	 */
680 	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
681 			(lsts == USB_LINK_STD_HOST_NC_8505))
682 		return 0;
683 
684 	ab->previous_link_status_state = lsts;
685 
686 	switch (lsts) {
687 	case USB_LINK_ACA_RID_B_8505:
688 		event = UX500_MUSB_RIDB;
689 	case USB_LINK_NOT_CONFIGURED_8505:
690 	case USB_LINK_RESERVED0_8505:
691 	case USB_LINK_RESERVED1_8505:
692 	case USB_LINK_RESERVED2_8505:
693 	case USB_LINK_RESERVED3_8505:
694 		ab->mode = USB_IDLE;
695 		ab->phy.otg->default_a = false;
696 		ab->vbus_draw = 0;
697 		if (event != UX500_MUSB_RIDB)
698 			event = UX500_MUSB_NONE;
699 		/*
700 		 * Fallback to default B_IDLE as nothing
701 		 * is connected
702 		 */
703 		ab->phy.otg->state = OTG_STATE_B_IDLE;
704 		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
705 		break;
706 
707 	case USB_LINK_ACA_RID_C_NM_8505:
708 		event = UX500_MUSB_RIDC;
709 	case USB_LINK_STD_HOST_NC_8505:
710 	case USB_LINK_STD_HOST_C_NS_8505:
711 	case USB_LINK_STD_HOST_C_S_8505:
712 	case USB_LINK_CDP_8505:
713 		if (ab->mode == USB_IDLE) {
714 			ab->mode = USB_PERIPHERAL;
715 			ab8500_usb_peri_phy_en(ab);
716 			atomic_notifier_call_chain(&ab->phy.notifier,
717 					UX500_MUSB_PREPARE, &ab->vbus_draw);
718 			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
719 		}
720 		if (event != UX500_MUSB_RIDC)
721 			event = UX500_MUSB_VBUS;
722 		break;
723 
724 	case USB_LINK_ACA_RID_A_8505:
725 	case USB_LINK_ACA_DOCK_CHGR_8505:
726 		event = UX500_MUSB_RIDA;
727 	case USB_LINK_HM_IDGND_8505:
728 		if (ab->mode == USB_IDLE) {
729 			ab->mode = USB_HOST;
730 			ab8500_usb_host_phy_en(ab);
731 			atomic_notifier_call_chain(&ab->phy.notifier,
732 					UX500_MUSB_PREPARE, &ab->vbus_draw);
733 		}
734 		ab->phy.otg->default_a = true;
735 		if (event != UX500_MUSB_RIDA)
736 			event = UX500_MUSB_ID;
737 		atomic_notifier_call_chain(&ab->phy.notifier,
738 				event, &ab->vbus_draw);
739 		break;
740 
741 	case USB_LINK_DEDICATED_CHG_8505:
742 		ab->mode = USB_DEDICATED_CHG;
743 		event = UX500_MUSB_CHARGER;
744 		atomic_notifier_call_chain(&ab->phy.notifier,
745 				event, &ab->vbus_draw);
746 		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
747 		break;
748 
749 	default:
750 		break;
751 	}
752 
753 	return 0;
754 }
755 
756 static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
757 		enum ab8500_usb_link_status lsts)
758 {
759 	enum ux500_musb_vbus_id_status event = 0;
760 
761 	dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
762 
763 	/*
764 	 * Spurious link_status interrupts are seen in case of a
765 	 * disconnection of a device in IDGND and RIDA stage
766 	 */
767 	if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
768 			(lsts == USB_LINK_STD_HOST_C_NS_8500 ||
769 			 lsts == USB_LINK_STD_HOST_NC_8500))
770 		return 0;
771 
772 	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
773 			lsts == USB_LINK_STD_HOST_NC_8500)
774 		return 0;
775 
776 	ab->previous_link_status_state = lsts;
777 
778 	switch (lsts) {
779 	case USB_LINK_ACA_RID_B_8500:
780 		event = UX500_MUSB_RIDB;
781 	case USB_LINK_NOT_CONFIGURED_8500:
782 	case USB_LINK_NOT_VALID_LINK_8500:
783 		ab->mode = USB_IDLE;
784 		ab->phy.otg->default_a = false;
785 		ab->vbus_draw = 0;
786 		if (event != UX500_MUSB_RIDB)
787 			event = UX500_MUSB_NONE;
788 		/* Fallback to default B_IDLE as nothing is connected */
789 		ab->phy.otg->state = OTG_STATE_B_IDLE;
790 		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
791 		break;
792 
793 	case USB_LINK_ACA_RID_C_NM_8500:
794 	case USB_LINK_ACA_RID_C_HS_8500:
795 	case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
796 		event = UX500_MUSB_RIDC;
797 	case USB_LINK_STD_HOST_NC_8500:
798 	case USB_LINK_STD_HOST_C_NS_8500:
799 	case USB_LINK_STD_HOST_C_S_8500:
800 	case USB_LINK_HOST_CHG_NM_8500:
801 	case USB_LINK_HOST_CHG_HS_8500:
802 	case USB_LINK_HOST_CHG_HS_CHIRP_8500:
803 		if (ab->mode == USB_IDLE) {
804 			ab->mode = USB_PERIPHERAL;
805 			ab8500_usb_peri_phy_en(ab);
806 			atomic_notifier_call_chain(&ab->phy.notifier,
807 					UX500_MUSB_PREPARE, &ab->vbus_draw);
808 			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
809 		}
810 		if (event != UX500_MUSB_RIDC)
811 			event = UX500_MUSB_VBUS;
812 		break;
813 
814 	case USB_LINK_ACA_RID_A_8500:
815 		event = UX500_MUSB_RIDA;
816 	case USB_LINK_HM_IDGND_8500:
817 		if (ab->mode == USB_IDLE) {
818 			ab->mode = USB_HOST;
819 			ab8500_usb_host_phy_en(ab);
820 			atomic_notifier_call_chain(&ab->phy.notifier,
821 					UX500_MUSB_PREPARE, &ab->vbus_draw);
822 		}
823 		ab->phy.otg->default_a = true;
824 		if (event != UX500_MUSB_RIDA)
825 			event = UX500_MUSB_ID;
826 		atomic_notifier_call_chain(&ab->phy.notifier,
827 				event, &ab->vbus_draw);
828 		break;
829 
830 	case USB_LINK_DEDICATED_CHG_8500:
831 		ab->mode = USB_DEDICATED_CHG;
832 		event = UX500_MUSB_CHARGER;
833 		atomic_notifier_call_chain(&ab->phy.notifier,
834 				event, &ab->vbus_draw);
835 		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
836 		break;
837 
838 	case USB_LINK_RESERVED_8500:
839 		break;
840 	}
841 
842 	return 0;
843 }
844 
845 /*
846  * Connection Sequence:
847  *   1. Link Status Interrupt
848  *   2. Enable AB clock
849  *   3. Enable AB regulators
850  *   4. Enable USB phy
851  *   5. Reset the musb controller
852  *   6. Switch the ULPI GPIO pins to fucntion mode
853  *   7. Enable the musb Peripheral5 clock
854  *   8. Restore MUSB context
855  */
856 static int abx500_usb_link_status_update(struct ab8500_usb *ab)
857 {
858 	u8 reg;
859 	int ret = 0;
860 
861 	if (is_ab8500(ab->ab8500)) {
862 		enum ab8500_usb_link_status lsts;
863 
864 		abx500_get_register_interruptible(ab->dev,
865 				AB8500_USB, AB8500_USB_LINE_STAT_REG, &reg);
866 		lsts = (reg >> 3) & 0x0F;
867 		ret = ab8500_usb_link_status_update(ab, lsts);
868 	} else if (is_ab8505(ab->ab8500)) {
869 		enum ab8505_usb_link_status lsts;
870 
871 		abx500_get_register_interruptible(ab->dev,
872 				AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
873 		lsts = (reg >> 3) & 0x1F;
874 		ret = ab8505_usb_link_status_update(ab, lsts);
875 	} else if (is_ab8540(ab->ab8500)) {
876 		enum ab8540_usb_link_status lsts;
877 
878 		abx500_get_register_interruptible(ab->dev,
879 				AB8500_USB, AB8540_USB_LINK_STAT_REG, &reg);
880 		lsts = (reg >> 3) & 0xFF;
881 		ret = ab8540_usb_link_status_update(ab, lsts);
882 	} else if (is_ab9540(ab->ab8500)) {
883 		enum ab9540_usb_link_status lsts;
884 
885 		abx500_get_register_interruptible(ab->dev,
886 				AB8500_USB, AB9540_USB_LINK_STAT_REG, &reg);
887 		lsts = (reg >> 3) & 0xFF;
888 		ret = ab9540_usb_link_status_update(ab, lsts);
889 	}
890 
891 	return ret;
892 }
893 
894 /*
895  * Disconnection Sequence:
896  *   1. Disconect Interrupt
897  *   2. Disable regulators
898  *   3. Disable AB clock
899  *   4. Disable the Phy
900  *   5. Link Status Interrupt
901  *   6. Disable Musb Clock
902  */
903 static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
904 {
905 	struct ab8500_usb *ab = (struct ab8500_usb *) data;
906 	enum usb_phy_events event = UX500_MUSB_NONE;
907 
908 	/* Link status will not be updated till phy is disabled. */
909 	if (ab->mode == USB_HOST) {
910 		ab->phy.otg->default_a = false;
911 		ab->vbus_draw = 0;
912 		atomic_notifier_call_chain(&ab->phy.notifier,
913 				event, &ab->vbus_draw);
914 		ab8500_usb_host_phy_dis(ab);
915 		ab->mode = USB_IDLE;
916 	}
917 
918 	if (ab->mode == USB_PERIPHERAL) {
919 		atomic_notifier_call_chain(&ab->phy.notifier,
920 				event, &ab->vbus_draw);
921 		ab8500_usb_peri_phy_dis(ab);
922 		atomic_notifier_call_chain(&ab->phy.notifier,
923 				UX500_MUSB_CLEAN, &ab->vbus_draw);
924 		ab->mode = USB_IDLE;
925 		ab->phy.otg->default_a = false;
926 		ab->vbus_draw = 0;
927 	}
928 
929 	if (is_ab8500_2p0(ab->ab8500)) {
930 		if (ab->mode == USB_DEDICATED_CHG) {
931 			ab8500_usb_wd_linkstatus(ab,
932 					AB8500_BIT_PHY_CTRL_DEVICE_EN);
933 			abx500_mask_and_set_register_interruptible(ab->dev,
934 					AB8500_USB, AB8500_USB_PHY_CTRL_REG,
935 					AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
936 		}
937 	}
938 
939 	return IRQ_HANDLED;
940 }
941 
942 static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
943 {
944 	struct ab8500_usb *ab = (struct ab8500_usb *)data;
945 
946 	abx500_usb_link_status_update(ab);
947 
948 	return IRQ_HANDLED;
949 }
950 
951 static void ab8500_usb_phy_disable_work(struct work_struct *work)
952 {
953 	struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
954 						phy_dis_work);
955 
956 	if (!ab->phy.otg->host)
957 		ab8500_usb_host_phy_dis(ab);
958 
959 	if (!ab->phy.otg->gadget)
960 		ab8500_usb_peri_phy_dis(ab);
961 }
962 
963 /* Check if VBUS is set and linkstatus has not detected a cable. */
964 static bool ab8500_usb_check_vbus_status(struct ab8500_usb *ab)
965 {
966 	u8 isource2;
967 	u8 reg;
968 	enum ab8540_usb_link_status lsts;
969 
970 	abx500_get_register_interruptible(ab->dev,
971 			AB8500_INTERRUPT, AB8500_IT_SOURCE2_REG,
972 			&isource2);
973 
974 	/* If Vbus is below 3.6V abort */
975 	if (!(isource2 & AB8500_BIT_SOURCE2_VBUSDET))
976 		return false;
977 
978 	abx500_get_register_interruptible(ab->dev,
979 			AB8500_USB, AB8540_USB_LINK_STAT_REG,
980 			&reg);
981 
982 	lsts = (reg >> 3) & 0xFF;
983 
984 	/* Check if linkstatus has detected a cable */
985 	if (lsts)
986 		return false;
987 
988 	return true;
989 }
990 
991 /* re-trigger charger detection again with watchdog re-kick. */
992 static void ab8500_usb_vbus_turn_on_event_work(struct work_struct *work)
993 {
994 	struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
995 			vbus_event_work);
996 
997 	if (ab->mode != USB_IDLE)
998 		return;
999 
1000 	abx500_set_register_interruptible(ab->dev,
1001 			AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1002 			AB8500_BIT_WD_CTRL_ENABLE);
1003 
1004 	udelay(100);
1005 
1006 	abx500_set_register_interruptible(ab->dev,
1007 			AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1008 			AB8500_BIT_WD_CTRL_ENABLE | AB8500_BIT_WD_CTRL_KICK);
1009 
1010 	udelay(100);
1011 
1012 	/* Disable Main watchdog */
1013 	abx500_set_register_interruptible(ab->dev,
1014 			AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
1015 			0x0);
1016 
1017 	/* Enable USB Charger detection */
1018 	abx500_mask_and_set_register_interruptible(ab->dev,
1019 			AB8500_USB, AB8540_VBUS_CTRL_REG,
1020 			AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA,
1021 			AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA);
1022 
1023 	ab->enabled_charging_detection = true;
1024 }
1025 
1026 static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
1027 {
1028 	/*
1029 	 * AB8500 V2 has eye diagram issues when drawing more than 100mA from
1030 	 * VBUS.  Set charging current to 100mA in case of standard host
1031 	 */
1032 	if (is_ab8500_2p0_or_earlier(ab->ab8500))
1033 		if (mA > 100)
1034 			mA = 100;
1035 
1036 	return mA;
1037 }
1038 
1039 static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA)
1040 {
1041 	struct ab8500_usb *ab;
1042 
1043 	if (!phy)
1044 		return -ENODEV;
1045 
1046 	ab = phy_to_ab(phy);
1047 
1048 	mA = ab8500_eyediagram_workaroud(ab, mA);
1049 
1050 	ab->vbus_draw = mA;
1051 
1052 	atomic_notifier_call_chain(&ab->phy.notifier,
1053 			UX500_MUSB_VBUS, &ab->vbus_draw);
1054 
1055 	return 0;
1056 }
1057 
1058 static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
1059 {
1060 	/* TODO */
1061 	return 0;
1062 }
1063 
1064 static int ab8500_usb_set_peripheral(struct usb_otg *otg,
1065 					struct usb_gadget *gadget)
1066 {
1067 	struct ab8500_usb *ab;
1068 
1069 	if (!otg)
1070 		return -ENODEV;
1071 
1072 	ab = phy_to_ab(otg->usb_phy);
1073 
1074 	ab->phy.otg->gadget = gadget;
1075 
1076 	/* Some drivers call this function in atomic context.
1077 	 * Do not update ab8500 registers directly till this
1078 	 * is fixed.
1079 	 */
1080 
1081 	if ((ab->mode != USB_IDLE) && !gadget) {
1082 		ab->mode = USB_IDLE;
1083 		schedule_work(&ab->phy_dis_work);
1084 	}
1085 
1086 	return 0;
1087 }
1088 
1089 static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
1090 {
1091 	struct ab8500_usb *ab;
1092 
1093 	if (!otg)
1094 		return -ENODEV;
1095 
1096 	ab = phy_to_ab(otg->usb_phy);
1097 
1098 	ab->phy.otg->host = host;
1099 
1100 	/* Some drivers call this function in atomic context.
1101 	 * Do not update ab8500 registers directly till this
1102 	 * is fixed.
1103 	 */
1104 
1105 	if ((ab->mode != USB_IDLE) && !host) {
1106 		ab->mode = USB_IDLE;
1107 		schedule_work(&ab->phy_dis_work);
1108 	}
1109 
1110 	return 0;
1111 }
1112 
1113 static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
1114 {
1115 	abx500_mask_and_set_register_interruptible(ab->dev,
1116 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1117 			AB8500_BIT_PHY_CTRL_DEVICE_EN,
1118 			AB8500_BIT_PHY_CTRL_DEVICE_EN);
1119 
1120 	udelay(100);
1121 
1122 	abx500_mask_and_set_register_interruptible(ab->dev,
1123 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1124 			AB8500_BIT_PHY_CTRL_DEVICE_EN,
1125 			0);
1126 
1127 	abx500_mask_and_set_register_interruptible(ab->dev,
1128 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1129 			AB8500_BIT_PHY_CTRL_HOST_EN,
1130 			AB8500_BIT_PHY_CTRL_HOST_EN);
1131 
1132 	udelay(100);
1133 
1134 	abx500_mask_and_set_register_interruptible(ab->dev,
1135 			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
1136 			AB8500_BIT_PHY_CTRL_HOST_EN,
1137 			0);
1138 }
1139 
1140 static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
1141 {
1142 	int err;
1143 
1144 	ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
1145 	if (IS_ERR(ab->v_ape)) {
1146 		dev_err(ab->dev, "Could not get v-ape supply\n");
1147 		err = PTR_ERR(ab->v_ape);
1148 		return err;
1149 	}
1150 
1151 	ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
1152 	if (IS_ERR(ab->v_ulpi)) {
1153 		dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
1154 		err = PTR_ERR(ab->v_ulpi);
1155 		return err;
1156 	}
1157 
1158 	ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
1159 	if (IS_ERR(ab->v_musb)) {
1160 		dev_err(ab->dev, "Could not get musb_1v8 supply\n");
1161 		err = PTR_ERR(ab->v_musb);
1162 		return err;
1163 	}
1164 
1165 	return 0;
1166 }
1167 
1168 static int ab8500_usb_irq_setup(struct platform_device *pdev,
1169 		struct ab8500_usb *ab)
1170 {
1171 	int err;
1172 	int irq;
1173 
1174 	if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
1175 		irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
1176 		if (irq < 0) {
1177 			dev_err(&pdev->dev, "Link status irq not found\n");
1178 			return irq;
1179 		}
1180 		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1181 				ab8500_usb_link_status_irq,
1182 				IRQF_NO_SUSPEND | IRQF_SHARED,
1183 				"usb-link-status", ab);
1184 		if (err < 0) {
1185 			dev_err(ab->dev, "request_irq failed for link status irq\n");
1186 			return err;
1187 		}
1188 	}
1189 
1190 	if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
1191 		irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
1192 		if (irq < 0) {
1193 			dev_err(&pdev->dev, "ID fall irq not found\n");
1194 			return irq;
1195 		}
1196 		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1197 				ab8500_usb_disconnect_irq,
1198 				IRQF_NO_SUSPEND | IRQF_SHARED,
1199 				"usb-id-fall", ab);
1200 		if (err < 0) {
1201 			dev_err(ab->dev, "request_irq failed for ID fall irq\n");
1202 			return err;
1203 		}
1204 	}
1205 
1206 	if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
1207 		irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
1208 		if (irq < 0) {
1209 			dev_err(&pdev->dev, "VBUS fall irq not found\n");
1210 			return irq;
1211 		}
1212 		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
1213 				ab8500_usb_disconnect_irq,
1214 				IRQF_NO_SUSPEND | IRQF_SHARED,
1215 				"usb-vbus-fall", ab);
1216 		if (err < 0) {
1217 			dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
1218 			return err;
1219 		}
1220 	}
1221 
1222 	return 0;
1223 }
1224 
1225 static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
1226 {
1227 	int err;
1228 
1229 	/* Enable the PBT/Bank 0x12 access */
1230 	err = abx500_set_register_interruptible(ab->dev,
1231 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1232 	if (err < 0)
1233 		dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1234 				err);
1235 
1236 	err = abx500_set_register_interruptible(ab->dev,
1237 			AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1238 	if (err < 0)
1239 		dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1240 				err);
1241 
1242 	err = abx500_set_register_interruptible(ab->dev,
1243 			AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
1244 	if (err < 0)
1245 		dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1246 				err);
1247 
1248 	err = abx500_set_register_interruptible(ab->dev,
1249 			AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
1250 	if (err < 0)
1251 		dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1252 				err);
1253 
1254 	/* Switch to normal mode/disable Bank 0x12 access */
1255 	err = abx500_set_register_interruptible(ab->dev,
1256 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1257 	if (err < 0)
1258 		dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1259 				err);
1260 }
1261 
1262 static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
1263 {
1264 	int err;
1265 
1266 	/* Enable the PBT/Bank 0x12 access */
1267 	err = abx500_mask_and_set_register_interruptible(ab->dev,
1268 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1269 			0x01, 0x01);
1270 	if (err < 0)
1271 		dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1272 				err);
1273 
1274 	err = abx500_mask_and_set_register_interruptible(ab->dev,
1275 			AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
1276 			0xC8, 0xC8);
1277 	if (err < 0)
1278 		dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1279 				err);
1280 
1281 	err = abx500_mask_and_set_register_interruptible(ab->dev,
1282 			AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
1283 			0x60, 0x60);
1284 	if (err < 0)
1285 		dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1286 				err);
1287 
1288 	err = abx500_mask_and_set_register_interruptible(ab->dev,
1289 			AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
1290 			0xFC, 0x80);
1291 
1292 	if (err < 0)
1293 		dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1294 				err);
1295 
1296 	/* Switch to normal mode/disable Bank 0x12 access */
1297 	err = abx500_mask_and_set_register_interruptible(ab->dev,
1298 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
1299 			0x00, 0x00);
1300 	if (err < 0)
1301 		dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1302 				err);
1303 }
1304 
1305 static void ab8500_usb_set_ab8540_tuning_values(struct ab8500_usb *ab)
1306 {
1307 	int err;
1308 
1309 	err = abx500_set_register_interruptible(ab->dev,
1310 			AB8540_DEBUG, AB8500_USB_PHY_TUNE1, 0xCC);
1311 	if (err < 0)
1312 		dev_err(ab->dev, "Failed to set PHY_TUNE1 register ret=%d\n",
1313 				err);
1314 
1315 	err = abx500_set_register_interruptible(ab->dev,
1316 			AB8540_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1317 	if (err < 0)
1318 		dev_err(ab->dev, "Failed to set PHY_TUNE2 register ret=%d\n",
1319 				err);
1320 
1321 	err = abx500_set_register_interruptible(ab->dev,
1322 			AB8540_DEBUG, AB8500_USB_PHY_TUNE3, 0x90);
1323 	if (err < 0)
1324 		dev_err(ab->dev, "Failed to set PHY_TUNE3 regester ret=%d\n",
1325 				err);
1326 }
1327 
1328 static void ab8500_usb_set_ab9540_tuning_values(struct ab8500_usb *ab)
1329 {
1330 	int err;
1331 
1332 	/* Enable the PBT/Bank 0x12 access */
1333 	err = abx500_set_register_interruptible(ab->dev,
1334 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
1335 	if (err < 0)
1336 		dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
1337 				err);
1338 
1339 	err = abx500_set_register_interruptible(ab->dev,
1340 			AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
1341 	if (err < 0)
1342 		dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
1343 				err);
1344 
1345 	err = abx500_set_register_interruptible(ab->dev,
1346 			AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
1347 	if (err < 0)
1348 		dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
1349 				err);
1350 
1351 	err = abx500_set_register_interruptible(ab->dev,
1352 			AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x80);
1353 	if (err < 0)
1354 		dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
1355 				err);
1356 
1357 	/* Switch to normal mode/disable Bank 0x12 access */
1358 	err = abx500_set_register_interruptible(ab->dev,
1359 			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
1360 	if (err < 0)
1361 		dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
1362 				err);
1363 }
1364 
1365 static int ab8500_usb_probe(struct platform_device *pdev)
1366 {
1367 	struct ab8500_usb	*ab;
1368 	struct ab8500		*ab8500;
1369 	struct usb_otg		*otg;
1370 	int err;
1371 	int rev;
1372 
1373 	ab8500 = dev_get_drvdata(pdev->dev.parent);
1374 	rev = abx500_get_chip_id(&pdev->dev);
1375 
1376 	if (is_ab8500_1p1_or_earlier(ab8500)) {
1377 		dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
1378 		return -ENODEV;
1379 	}
1380 
1381 	ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
1382 	if (!ab)
1383 		return -ENOMEM;
1384 
1385 	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
1386 	if (!otg)
1387 		return -ENOMEM;
1388 
1389 	ab->dev			= &pdev->dev;
1390 	ab->ab8500		= ab8500;
1391 	ab->phy.dev		= ab->dev;
1392 	ab->phy.otg		= otg;
1393 	ab->phy.label		= "ab8500";
1394 	ab->phy.set_suspend	= ab8500_usb_set_suspend;
1395 	ab->phy.set_power	= ab8500_usb_set_power;
1396 	ab->phy.otg->state	= OTG_STATE_UNDEFINED;
1397 
1398 	otg->usb_phy		= &ab->phy;
1399 	otg->set_host		= ab8500_usb_set_host;
1400 	otg->set_peripheral	= ab8500_usb_set_peripheral;
1401 
1402 	if (is_ab8500(ab->ab8500)) {
1403 		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1404 			AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1405 			AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1406 			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1407 	} else if (is_ab8505(ab->ab8500)) {
1408 		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1409 			AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1410 			AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
1411 			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1412 	} else if (is_ab8540(ab->ab8500)) {
1413 		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1414 			AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS |
1415 			AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK |
1416 			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1417 	} else if (is_ab9540(ab->ab8500)) {
1418 		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
1419 			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1420 		if (is_ab9540_2p0_or_earlier(ab->ab8500))
1421 			ab->flags |= AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
1422 				AB8500_USB_FLAG_USE_VBUS_DET_IRQ;
1423 	}
1424 
1425 	/* Disable regulator voltage setting for AB8500 <= v2.0 */
1426 	if (is_ab8500_2p0_or_earlier(ab->ab8500))
1427 		ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
1428 
1429 	platform_set_drvdata(pdev, ab);
1430 
1431 	/* all: Disable phy when called from set_host and set_peripheral */
1432 	INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
1433 
1434 	INIT_WORK(&ab->vbus_event_work, ab8500_usb_vbus_turn_on_event_work);
1435 
1436 	err = ab8500_usb_regulator_get(ab);
1437 	if (err)
1438 		return err;
1439 
1440 	ab->sysclk = devm_clk_get(ab->dev, "sysclk");
1441 	if (IS_ERR(ab->sysclk)) {
1442 		dev_err(ab->dev, "Could not get sysclk.\n");
1443 		return PTR_ERR(ab->sysclk);
1444 	}
1445 
1446 	err = ab8500_usb_irq_setup(pdev, ab);
1447 	if (err < 0)
1448 		return err;
1449 
1450 	err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
1451 	if (err) {
1452 		dev_err(&pdev->dev, "Can't register transceiver\n");
1453 		return err;
1454 	}
1455 
1456 	if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
1457 		/* Phy tuning values for AB8500 > v2.0 */
1458 		ab8500_usb_set_ab8500_tuning_values(ab);
1459 	else if (is_ab8505(ab->ab8500))
1460 		/* Phy tuning values for AB8505 */
1461 		ab8500_usb_set_ab8505_tuning_values(ab);
1462 	else if (is_ab8540(ab->ab8500))
1463 		/* Phy tuning values for AB8540 */
1464 		ab8500_usb_set_ab8540_tuning_values(ab);
1465 	else if (is_ab9540(ab->ab8500))
1466 		/* Phy tuning values for AB9540 */
1467 		ab8500_usb_set_ab9540_tuning_values(ab);
1468 
1469 	/* Needed to enable ID detection. */
1470 	ab8500_usb_wd_workaround(ab);
1471 
1472 	/*
1473 	 * This is required for usb-link-status to work properly when a
1474 	 * cable is connected at boot time.
1475 	 */
1476 	ab8500_usb_restart_phy(ab);
1477 
1478 	if (ab->flags & AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS) {
1479 		if (ab8500_usb_check_vbus_status(ab))
1480 			schedule_work(&ab->vbus_event_work);
1481 	}
1482 
1483 	abx500_usb_link_status_update(ab);
1484 
1485 	dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
1486 
1487 	return 0;
1488 }
1489 
1490 static int ab8500_usb_remove(struct platform_device *pdev)
1491 {
1492 	struct ab8500_usb *ab = platform_get_drvdata(pdev);
1493 
1494 	cancel_work_sync(&ab->phy_dis_work);
1495 	cancel_work_sync(&ab->vbus_event_work);
1496 
1497 	usb_remove_phy(&ab->phy);
1498 
1499 	if (ab->mode == USB_HOST)
1500 		ab8500_usb_host_phy_dis(ab);
1501 	else if (ab->mode == USB_PERIPHERAL)
1502 		ab8500_usb_peri_phy_dis(ab);
1503 
1504 	return 0;
1505 }
1506 
1507 static struct platform_device_id ab8500_usb_devtype[] = {
1508 	{ .name = "ab8500-usb", },
1509 	{ .name = "ab8540-usb", },
1510 	{ .name = "ab9540-usb", },
1511 	{ /* sentinel */ }
1512 };
1513 MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
1514 
1515 static struct platform_driver ab8500_usb_driver = {
1516 	.probe		= ab8500_usb_probe,
1517 	.remove		= ab8500_usb_remove,
1518 	.id_table	= ab8500_usb_devtype,
1519 	.driver		= {
1520 		.name	= "abx5x0-usb",
1521 	},
1522 };
1523 
1524 static int __init ab8500_usb_init(void)
1525 {
1526 	return platform_driver_register(&ab8500_usb_driver);
1527 }
1528 subsys_initcall(ab8500_usb_init);
1529 
1530 static void __exit ab8500_usb_exit(void)
1531 {
1532 	platform_driver_unregister(&ab8500_usb_driver);
1533 }
1534 module_exit(ab8500_usb_exit);
1535 
1536 MODULE_AUTHOR("ST-Ericsson AB");
1537 MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
1538 MODULE_LICENSE("GPL");
1539