Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/usb/phy/phy-ab8500-usb.c

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

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