Version:  2.0.40 2.2.26 2.4.37 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 3.17 3.18 3.19 4.0

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

  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 

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