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-fsl-usb.c

  1 /*
  2  * Copyright (C) 2007,2008 Freescale semiconductor, Inc.
  3  *
  4  * Author: Li Yang <LeoLi@freescale.com>
  5  *         Jerry Huang <Chang-Ming.Huang@freescale.com>
  6  *
  7  * Initialization based on code from Shlomi Gridish.
  8  *
  9  * This program is free software; you can redistribute  it and/or modify it
 10  * under  the terms of  the GNU General  Public License as published by the
 11  * Free Software Foundation;  either version 2 of the  License, or (at your
 12  * option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful, but
 15  * WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  * General Public License for more details.
 18  *
 19  * You should have received a copy of the  GNU General Public License along
 20  * with this program; if not, write  to the Free Software Foundation, Inc.,
 21  * 675 Mass Ave, Cambridge, MA 02139, USA.
 22  */
 23 
 24 #include <linux/module.h>
 25 #include <linux/kernel.h>
 26 #include <linux/delay.h>
 27 #include <linux/slab.h>
 28 #include <linux/proc_fs.h>
 29 #include <linux/errno.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/io.h>
 32 #include <linux/timer.h>
 33 #include <linux/usb.h>
 34 #include <linux/device.h>
 35 #include <linux/usb/ch9.h>
 36 #include <linux/usb/gadget.h>
 37 #include <linux/workqueue.h>
 38 #include <linux/time.h>
 39 #include <linux/fsl_devices.h>
 40 #include <linux/platform_device.h>
 41 #include <linux/uaccess.h>
 42 
 43 #include <asm/unaligned.h>
 44 
 45 #include "phy-fsl-usb.h"
 46 
 47 #define DRIVER_VERSION "Rev. 1.55"
 48 #define DRIVER_AUTHOR "Jerry Huang/Li Yang"
 49 #define DRIVER_DESC "Freescale USB OTG Transceiver Driver"
 50 #define DRIVER_INFO DRIVER_DESC " " DRIVER_VERSION
 51 
 52 static const char driver_name[] = "fsl-usb2-otg";
 53 
 54 const pm_message_t otg_suspend_state = {
 55         .event = 1,
 56 };
 57 
 58 #define HA_DATA_PULSE
 59 
 60 static struct usb_dr_mmap *usb_dr_regs;
 61 static struct fsl_otg *fsl_otg_dev;
 62 static int srp_wait_done;
 63 
 64 /* FSM timers */
 65 struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr, *a_aidl_bdis_tmr,
 66         *b_ase0_brst_tmr, *b_se0_srp_tmr;
 67 
 68 /* Driver specific timers */
 69 struct fsl_otg_timer *b_data_pulse_tmr, *b_vbus_pulse_tmr, *b_srp_fail_tmr,
 70         *b_srp_wait_tmr, *a_wait_enum_tmr;
 71 
 72 static struct list_head active_timers;
 73 
 74 static struct fsl_otg_config fsl_otg_initdata = {
 75         .otg_port = 1,
 76 };
 77 
 78 #ifdef CONFIG_PPC32
 79 static u32 _fsl_readl_be(const unsigned __iomem *p)
 80 {
 81         return in_be32(p);
 82 }
 83 
 84 static u32 _fsl_readl_le(const unsigned __iomem *p)
 85 {
 86         return in_le32(p);
 87 }
 88 
 89 static void _fsl_writel_be(u32 v, unsigned __iomem *p)
 90 {
 91         out_be32(p, v);
 92 }
 93 
 94 static void _fsl_writel_le(u32 v, unsigned __iomem *p)
 95 {
 96         out_le32(p, v);
 97 }
 98 
 99 static u32 (*_fsl_readl)(const unsigned __iomem *p);
100 static void (*_fsl_writel)(u32 v, unsigned __iomem *p);
101 
102 #define fsl_readl(p)            (*_fsl_readl)((p))
103 #define fsl_writel(v, p)        (*_fsl_writel)((v), (p))
104 
105 #else
106 #define fsl_readl(addr)         readl(addr)
107 #define fsl_writel(val, addr)   writel(val, addr)
108 #endif /* CONFIG_PPC32 */
109 
110 int write_ulpi(u8 addr, u8 data)
111 {
112         u32 temp;
113 
114         temp = 0x60000000 | (addr << 16) | data;
115         fsl_writel(temp, &usb_dr_regs->ulpiview);
116         return 0;
117 }
118 
119 /* -------------------------------------------------------------*/
120 /* Operations that will be called from OTG Finite State Machine */
121 
122 /* Charge vbus for vbus pulsing in SRP */
123 void fsl_otg_chrg_vbus(struct otg_fsm *fsm, int on)
124 {
125         u32 tmp;
126 
127         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
128 
129         if (on)
130                 /* stop discharging, start charging */
131                 tmp = (tmp & ~OTGSC_CTRL_VBUS_DISCHARGE) |
132                         OTGSC_CTRL_VBUS_CHARGE;
133         else
134                 /* stop charging */
135                 tmp &= ~OTGSC_CTRL_VBUS_CHARGE;
136 
137         fsl_writel(tmp, &usb_dr_regs->otgsc);
138 }
139 
140 /* Discharge vbus through a resistor to ground */
141 void fsl_otg_dischrg_vbus(int on)
142 {
143         u32 tmp;
144 
145         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
146 
147         if (on)
148                 /* stop charging, start discharging */
149                 tmp = (tmp & ~OTGSC_CTRL_VBUS_CHARGE) |
150                         OTGSC_CTRL_VBUS_DISCHARGE;
151         else
152                 /* stop discharging */
153                 tmp &= ~OTGSC_CTRL_VBUS_DISCHARGE;
154 
155         fsl_writel(tmp, &usb_dr_regs->otgsc);
156 }
157 
158 /* A-device driver vbus, controlled through PP bit in PORTSC */
159 void fsl_otg_drv_vbus(struct otg_fsm *fsm, int on)
160 {
161         u32 tmp;
162 
163         if (on) {
164                 tmp = fsl_readl(&usb_dr_regs->portsc) & ~PORTSC_W1C_BITS;
165                 fsl_writel(tmp | PORTSC_PORT_POWER, &usb_dr_regs->portsc);
166         } else {
167                 tmp = fsl_readl(&usb_dr_regs->portsc) &
168                       ~PORTSC_W1C_BITS & ~PORTSC_PORT_POWER;
169                 fsl_writel(tmp, &usb_dr_regs->portsc);
170         }
171 }
172 
173 /*
174  * Pull-up D+, signalling connect by periperal. Also used in
175  * data-line pulsing in SRP
176  */
177 void fsl_otg_loc_conn(struct otg_fsm *fsm, int on)
178 {
179         u32 tmp;
180 
181         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
182 
183         if (on)
184                 tmp |= OTGSC_CTRL_DATA_PULSING;
185         else
186                 tmp &= ~OTGSC_CTRL_DATA_PULSING;
187 
188         fsl_writel(tmp, &usb_dr_regs->otgsc);
189 }
190 
191 /*
192  * Generate SOF by host.  This is controlled through suspend/resume the
193  * port.  In host mode, controller will automatically send SOF.
194  * Suspend will block the data on the port.
195  */
196 void fsl_otg_loc_sof(struct otg_fsm *fsm, int on)
197 {
198         u32 tmp;
199 
200         tmp = fsl_readl(&fsl_otg_dev->dr_mem_map->portsc) & ~PORTSC_W1C_BITS;
201         if (on)
202                 tmp |= PORTSC_PORT_FORCE_RESUME;
203         else
204                 tmp |= PORTSC_PORT_SUSPEND;
205 
206         fsl_writel(tmp, &fsl_otg_dev->dr_mem_map->portsc);
207 
208 }
209 
210 /* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
211 void fsl_otg_start_pulse(struct otg_fsm *fsm)
212 {
213         u32 tmp;
214 
215         srp_wait_done = 0;
216 #ifdef HA_DATA_PULSE
217         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
218         tmp |= OTGSC_HA_DATA_PULSE;
219         fsl_writel(tmp, &usb_dr_regs->otgsc);
220 #else
221         fsl_otg_loc_conn(1);
222 #endif
223 
224         fsl_otg_add_timer(fsm, b_data_pulse_tmr);
225 }
226 
227 void b_data_pulse_end(unsigned long foo)
228 {
229 #ifdef HA_DATA_PULSE
230 #else
231         fsl_otg_loc_conn(0);
232 #endif
233 
234         /* Do VBUS pulse after data pulse */
235         fsl_otg_pulse_vbus();
236 }
237 
238 void fsl_otg_pulse_vbus(void)
239 {
240         srp_wait_done = 0;
241         fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 1);
242         /* start the timer to end vbus charge */
243         fsl_otg_add_timer(&fsl_otg_dev->fsm, b_vbus_pulse_tmr);
244 }
245 
246 void b_vbus_pulse_end(unsigned long foo)
247 {
248         fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 0);
249 
250         /*
251          * As USB3300 using the same a_sess_vld and b_sess_vld voltage
252          * we need to discharge the bus for a while to distinguish
253          * residual voltage of vbus pulsing and A device pull up
254          */
255         fsl_otg_dischrg_vbus(1);
256         fsl_otg_add_timer(&fsl_otg_dev->fsm, b_srp_wait_tmr);
257 }
258 
259 void b_srp_end(unsigned long foo)
260 {
261         fsl_otg_dischrg_vbus(0);
262         srp_wait_done = 1;
263 
264         if ((fsl_otg_dev->phy.otg->state == OTG_STATE_B_SRP_INIT) &&
265             fsl_otg_dev->fsm.b_sess_vld)
266                 fsl_otg_dev->fsm.b_srp_done = 1;
267 }
268 
269 /*
270  * Workaround for a_host suspending too fast.  When a_bus_req=0,
271  * a_host will start by SRP.  It needs to set b_hnp_enable before
272  * actually suspending to start HNP
273  */
274 void a_wait_enum(unsigned long foo)
275 {
276         VDBG("a_wait_enum timeout\n");
277         if (!fsl_otg_dev->phy.otg->host->b_hnp_enable)
278                 fsl_otg_add_timer(&fsl_otg_dev->fsm, a_wait_enum_tmr);
279         else
280                 otg_statemachine(&fsl_otg_dev->fsm);
281 }
282 
283 /* The timeout callback function to set time out bit */
284 void set_tmout(unsigned long indicator)
285 {
286         *(int *)indicator = 1;
287 }
288 
289 /* Initialize timers */
290 int fsl_otg_init_timers(struct otg_fsm *fsm)
291 {
292         /* FSM used timers */
293         a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
294                                 (unsigned long)&fsm->a_wait_vrise_tmout);
295         if (!a_wait_vrise_tmr)
296                 return -ENOMEM;
297 
298         a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
299                                 (unsigned long)&fsm->a_wait_bcon_tmout);
300         if (!a_wait_bcon_tmr)
301                 return -ENOMEM;
302 
303         a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
304                                 (unsigned long)&fsm->a_aidl_bdis_tmout);
305         if (!a_aidl_bdis_tmr)
306                 return -ENOMEM;
307 
308         b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
309                                 (unsigned long)&fsm->b_ase0_brst_tmout);
310         if (!b_ase0_brst_tmr)
311                 return -ENOMEM;
312 
313         b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
314                                 (unsigned long)&fsm->b_se0_srp);
315         if (!b_se0_srp_tmr)
316                 return -ENOMEM;
317 
318         b_srp_fail_tmr = otg_timer_initializer(&set_tmout, TB_SRP_FAIL,
319                                 (unsigned long)&fsm->b_srp_done);
320         if (!b_srp_fail_tmr)
321                 return -ENOMEM;
322 
323         a_wait_enum_tmr = otg_timer_initializer(&a_wait_enum, 10,
324                                 (unsigned long)&fsm);
325         if (!a_wait_enum_tmr)
326                 return -ENOMEM;
327 
328         /* device driver used timers */
329         b_srp_wait_tmr = otg_timer_initializer(&b_srp_end, TB_SRP_WAIT, 0);
330         if (!b_srp_wait_tmr)
331                 return -ENOMEM;
332 
333         b_data_pulse_tmr = otg_timer_initializer(&b_data_pulse_end,
334                                 TB_DATA_PLS, 0);
335         if (!b_data_pulse_tmr)
336                 return -ENOMEM;
337 
338         b_vbus_pulse_tmr = otg_timer_initializer(&b_vbus_pulse_end,
339                                 TB_VBUS_PLS, 0);
340         if (!b_vbus_pulse_tmr)
341                 return -ENOMEM;
342 
343         return 0;
344 }
345 
346 /* Uninitialize timers */
347 void fsl_otg_uninit_timers(void)
348 {
349         /* FSM used timers */
350         kfree(a_wait_vrise_tmr);
351         kfree(a_wait_bcon_tmr);
352         kfree(a_aidl_bdis_tmr);
353         kfree(b_ase0_brst_tmr);
354         kfree(b_se0_srp_tmr);
355         kfree(b_srp_fail_tmr);
356         kfree(a_wait_enum_tmr);
357 
358         /* device driver used timers */
359         kfree(b_srp_wait_tmr);
360         kfree(b_data_pulse_tmr);
361         kfree(b_vbus_pulse_tmr);
362 }
363 
364 static struct fsl_otg_timer *fsl_otg_get_timer(enum otg_fsm_timer t)
365 {
366         struct fsl_otg_timer *timer;
367 
368         /* REVISIT: use array of pointers to timers instead */
369         switch (t) {
370         case A_WAIT_VRISE:
371                 timer = a_wait_vrise_tmr;
372                 break;
373         case A_WAIT_BCON:
374                 timer = a_wait_vrise_tmr;
375                 break;
376         case A_AIDL_BDIS:
377                 timer = a_wait_vrise_tmr;
378                 break;
379         case B_ASE0_BRST:
380                 timer = a_wait_vrise_tmr;
381                 break;
382         case B_SE0_SRP:
383                 timer = a_wait_vrise_tmr;
384                 break;
385         case B_SRP_FAIL:
386                 timer = a_wait_vrise_tmr;
387                 break;
388         case A_WAIT_ENUM:
389                 timer = a_wait_vrise_tmr;
390                 break;
391         default:
392                 timer = NULL;
393         }
394 
395         return timer;
396 }
397 
398 /* Add timer to timer list */
399 void fsl_otg_add_timer(struct otg_fsm *fsm, void *gtimer)
400 {
401         struct fsl_otg_timer *timer = gtimer;
402         struct fsl_otg_timer *tmp_timer;
403 
404         /*
405          * Check if the timer is already in the active list,
406          * if so update timer count
407          */
408         list_for_each_entry(tmp_timer, &active_timers, list)
409             if (tmp_timer == timer) {
410                 timer->count = timer->expires;
411                 return;
412         }
413         timer->count = timer->expires;
414         list_add_tail(&timer->list, &active_timers);
415 }
416 
417 static void fsl_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
418 {
419         struct fsl_otg_timer *timer;
420 
421         timer = fsl_otg_get_timer(t);
422         if (!timer)
423                 return;
424 
425         fsl_otg_add_timer(fsm, timer);
426 }
427 
428 /* Remove timer from the timer list; clear timeout status */
429 void fsl_otg_del_timer(struct otg_fsm *fsm, void *gtimer)
430 {
431         struct fsl_otg_timer *timer = gtimer;
432         struct fsl_otg_timer *tmp_timer, *del_tmp;
433 
434         list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
435                 if (tmp_timer == timer)
436                         list_del(&timer->list);
437 }
438 
439 static void fsl_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
440 {
441         struct fsl_otg_timer *timer;
442 
443         timer = fsl_otg_get_timer(t);
444         if (!timer)
445                 return;
446 
447         fsl_otg_del_timer(fsm, timer);
448 }
449 
450 /* Reset controller, not reset the bus */
451 void otg_reset_controller(void)
452 {
453         u32 command;
454 
455         command = fsl_readl(&usb_dr_regs->usbcmd);
456         command |= (1 << 1);
457         fsl_writel(command, &usb_dr_regs->usbcmd);
458         while (fsl_readl(&usb_dr_regs->usbcmd) & (1 << 1))
459                 ;
460 }
461 
462 /* Call suspend/resume routines in host driver */
463 int fsl_otg_start_host(struct otg_fsm *fsm, int on)
464 {
465         struct usb_otg *otg = fsm->otg;
466         struct device *dev;
467         struct fsl_otg *otg_dev =
468                 container_of(otg->usb_phy, struct fsl_otg, phy);
469         u32 retval = 0;
470 
471         if (!otg->host)
472                 return -ENODEV;
473         dev = otg->host->controller;
474 
475         /*
476          * Update a_vbus_vld state as a_vbus_vld int is disabled
477          * in device mode
478          */
479         fsm->a_vbus_vld =
480                 !!(fsl_readl(&usb_dr_regs->otgsc) & OTGSC_STS_A_VBUS_VALID);
481         if (on) {
482                 /* start fsl usb host controller */
483                 if (otg_dev->host_working)
484                         goto end;
485                 else {
486                         otg_reset_controller();
487                         VDBG("host on......\n");
488                         if (dev->driver->pm && dev->driver->pm->resume) {
489                                 retval = dev->driver->pm->resume(dev);
490                                 if (fsm->id) {
491                                         /* default-b */
492                                         fsl_otg_drv_vbus(fsm, 1);
493                                         /*
494                                          * Workaround: b_host can't driver
495                                          * vbus, but PP in PORTSC needs to
496                                          * be 1 for host to work.
497                                          * So we set drv_vbus bit in
498                                          * transceiver to 0 thru ULPI.
499                                          */
500                                         write_ulpi(0x0c, 0x20);
501                                 }
502                         }
503 
504                         otg_dev->host_working = 1;
505                 }
506         } else {
507                 /* stop fsl usb host controller */
508                 if (!otg_dev->host_working)
509                         goto end;
510                 else {
511                         VDBG("host off......\n");
512                         if (dev && dev->driver) {
513                                 if (dev->driver->pm && dev->driver->pm->suspend)
514                                         retval = dev->driver->pm->suspend(dev);
515                                 if (fsm->id)
516                                         /* default-b */
517                                         fsl_otg_drv_vbus(fsm, 0);
518                         }
519                         otg_dev->host_working = 0;
520                 }
521         }
522 end:
523         return retval;
524 }
525 
526 /*
527  * Call suspend and resume function in udc driver
528  * to stop and start udc driver.
529  */
530 int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
531 {
532         struct usb_otg *otg = fsm->otg;
533         struct device *dev;
534 
535         if (!otg->gadget || !otg->gadget->dev.parent)
536                 return -ENODEV;
537 
538         VDBG("gadget %s\n", on ? "on" : "off");
539         dev = otg->gadget->dev.parent;
540 
541         if (on) {
542                 if (dev->driver->resume)
543                         dev->driver->resume(dev);
544         } else {
545                 if (dev->driver->suspend)
546                         dev->driver->suspend(dev, otg_suspend_state);
547         }
548 
549         return 0;
550 }
551 
552 /*
553  * Called by initialization code of host driver.  Register host controller
554  * to the OTG.  Suspend host for OTG role detection.
555  */
556 static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
557 {
558         struct fsl_otg *otg_dev;
559 
560         if (!otg)
561                 return -ENODEV;
562 
563         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
564         if (otg_dev != fsl_otg_dev)
565                 return -ENODEV;
566 
567         otg->host = host;
568 
569         otg_dev->fsm.a_bus_drop = 0;
570         otg_dev->fsm.a_bus_req = 1;
571 
572         if (host) {
573                 VDBG("host off......\n");
574 
575                 otg->host->otg_port = fsl_otg_initdata.otg_port;
576                 otg->host->is_b_host = otg_dev->fsm.id;
577                 /*
578                  * must leave time for hub_wq to finish its thing
579                  * before yanking the host driver out from under it,
580                  * so suspend the host after a short delay.
581                  */
582                 otg_dev->host_working = 1;
583                 schedule_delayed_work(&otg_dev->otg_event, 100);
584                 return 0;
585         } else {
586                 /* host driver going away */
587                 if (!(fsl_readl(&otg_dev->dr_mem_map->otgsc) &
588                       OTGSC_STS_USB_ID)) {
589                         /* Mini-A cable connected */
590                         struct otg_fsm *fsm = &otg_dev->fsm;
591 
592                         otg->state = OTG_STATE_UNDEFINED;
593                         fsm->protocol = PROTO_UNDEF;
594                 }
595         }
596 
597         otg_dev->host_working = 0;
598 
599         otg_statemachine(&otg_dev->fsm);
600 
601         return 0;
602 }
603 
604 /* Called by initialization code of udc.  Register udc to OTG. */
605 static int fsl_otg_set_peripheral(struct usb_otg *otg,
606                                         struct usb_gadget *gadget)
607 {
608         struct fsl_otg *otg_dev;
609 
610         if (!otg)
611                 return -ENODEV;
612 
613         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
614         VDBG("otg_dev 0x%x\n", (int)otg_dev);
615         VDBG("fsl_otg_dev 0x%x\n", (int)fsl_otg_dev);
616         if (otg_dev != fsl_otg_dev)
617                 return -ENODEV;
618 
619         if (!gadget) {
620                 if (!otg->default_a)
621                         otg->gadget->ops->vbus_draw(otg->gadget, 0);
622                 usb_gadget_vbus_disconnect(otg->gadget);
623                 otg->gadget = 0;
624                 otg_dev->fsm.b_bus_req = 0;
625                 otg_statemachine(&otg_dev->fsm);
626                 return 0;
627         }
628 
629         otg->gadget = gadget;
630         otg->gadget->is_a_peripheral = !otg_dev->fsm.id;
631 
632         otg_dev->fsm.b_bus_req = 1;
633 
634         /* start the gadget right away if the ID pin says Mini-B */
635         pr_debug("ID pin=%d\n", otg_dev->fsm.id);
636         if (otg_dev->fsm.id == 1) {
637                 fsl_otg_start_host(&otg_dev->fsm, 0);
638                 otg_drv_vbus(&otg_dev->fsm, 0);
639                 fsl_otg_start_gadget(&otg_dev->fsm, 1);
640         }
641 
642         return 0;
643 }
644 
645 /* Set OTG port power, only for B-device */
646 static int fsl_otg_set_power(struct usb_phy *phy, unsigned mA)
647 {
648         if (!fsl_otg_dev)
649                 return -ENODEV;
650         if (phy->otg->state == OTG_STATE_B_PERIPHERAL)
651                 pr_info("FSL OTG: Draw %d mA\n", mA);
652 
653         return 0;
654 }
655 
656 /*
657  * Delayed pin detect interrupt processing.
658  *
659  * When the Mini-A cable is disconnected from the board,
660  * the pin-detect interrupt happens before the disconnect
661  * interrupts for the connected device(s).  In order to
662  * process the disconnect interrupt(s) prior to switching
663  * roles, the pin-detect interrupts are delayed, and handled
664  * by this routine.
665  */
666 static void fsl_otg_event(struct work_struct *work)
667 {
668         struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
669         struct otg_fsm *fsm = &og->fsm;
670 
671         if (fsm->id) {          /* switch to gadget */
672                 fsl_otg_start_host(fsm, 0);
673                 otg_drv_vbus(fsm, 0);
674                 fsl_otg_start_gadget(fsm, 1);
675         }
676 }
677 
678 /* B-device start SRP */
679 static int fsl_otg_start_srp(struct usb_otg *otg)
680 {
681         struct fsl_otg *otg_dev;
682 
683         if (!otg || otg->state != OTG_STATE_B_IDLE)
684                 return -ENODEV;
685 
686         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
687         if (otg_dev != fsl_otg_dev)
688                 return -ENODEV;
689 
690         otg_dev->fsm.b_bus_req = 1;
691         otg_statemachine(&otg_dev->fsm);
692 
693         return 0;
694 }
695 
696 /* A_host suspend will call this function to start hnp */
697 static int fsl_otg_start_hnp(struct usb_otg *otg)
698 {
699         struct fsl_otg *otg_dev;
700 
701         if (!otg)
702                 return -ENODEV;
703 
704         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
705         if (otg_dev != fsl_otg_dev)
706                 return -ENODEV;
707 
708         pr_debug("start_hnp...\n");
709 
710         /* clear a_bus_req to enter a_suspend state */
711         otg_dev->fsm.a_bus_req = 0;
712         otg_statemachine(&otg_dev->fsm);
713 
714         return 0;
715 }
716 
717 /*
718  * Interrupt handler.  OTG/host/peripheral share the same int line.
719  * OTG driver clears OTGSC interrupts and leaves USB interrupts
720  * intact.  It needs to have knowledge of some USB interrupts
721  * such as port change.
722  */
723 irqreturn_t fsl_otg_isr(int irq, void *dev_id)
724 {
725         struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
726         struct usb_otg *otg = ((struct fsl_otg *)dev_id)->phy.otg;
727         u32 otg_int_src, otg_sc;
728 
729         otg_sc = fsl_readl(&usb_dr_regs->otgsc);
730         otg_int_src = otg_sc & OTGSC_INTSTS_MASK & (otg_sc >> 8);
731 
732         /* Only clear otg interrupts */
733         fsl_writel(otg_sc, &usb_dr_regs->otgsc);
734 
735         /*FIXME: ID change not generate when init to 0 */
736         fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
737         otg->default_a = (fsm->id == 0);
738 
739         /* process OTG interrupts */
740         if (otg_int_src) {
741                 if (otg_int_src & OTGSC_INTSTS_USB_ID) {
742                         fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
743                         otg->default_a = (fsm->id == 0);
744                         /* clear conn information */
745                         if (fsm->id)
746                                 fsm->b_conn = 0;
747                         else
748                                 fsm->a_conn = 0;
749 
750                         if (otg->host)
751                                 otg->host->is_b_host = fsm->id;
752                         if (otg->gadget)
753                                 otg->gadget->is_a_peripheral = !fsm->id;
754                         VDBG("ID int (ID is %d)\n", fsm->id);
755 
756                         if (fsm->id) {  /* switch to gadget */
757                                 schedule_delayed_work(
758                                         &((struct fsl_otg *)dev_id)->otg_event,
759                                         100);
760                         } else {        /* switch to host */
761                                 cancel_delayed_work(&
762                                                     ((struct fsl_otg *)dev_id)->
763                                                     otg_event);
764                                 fsl_otg_start_gadget(fsm, 0);
765                                 otg_drv_vbus(fsm, 1);
766                                 fsl_otg_start_host(fsm, 1);
767                         }
768                         return IRQ_HANDLED;
769                 }
770         }
771         return IRQ_NONE;
772 }
773 
774 static struct otg_fsm_ops fsl_otg_ops = {
775         .chrg_vbus = fsl_otg_chrg_vbus,
776         .drv_vbus = fsl_otg_drv_vbus,
777         .loc_conn = fsl_otg_loc_conn,
778         .loc_sof = fsl_otg_loc_sof,
779         .start_pulse = fsl_otg_start_pulse,
780 
781         .add_timer = fsl_otg_fsm_add_timer,
782         .del_timer = fsl_otg_fsm_del_timer,
783 
784         .start_host = fsl_otg_start_host,
785         .start_gadget = fsl_otg_start_gadget,
786 };
787 
788 /* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
789 static int fsl_otg_conf(struct platform_device *pdev)
790 {
791         struct fsl_otg *fsl_otg_tc;
792         int status;
793 
794         if (fsl_otg_dev)
795                 return 0;
796 
797         /* allocate space to fsl otg device */
798         fsl_otg_tc = kzalloc(sizeof(struct fsl_otg), GFP_KERNEL);
799         if (!fsl_otg_tc)
800                 return -ENOMEM;
801 
802         fsl_otg_tc->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
803         if (!fsl_otg_tc->phy.otg) {
804                 kfree(fsl_otg_tc);
805                 return -ENOMEM;
806         }
807 
808         INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);
809 
810         INIT_LIST_HEAD(&active_timers);
811         status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
812         if (status) {
813                 pr_info("Couldn't init OTG timers\n");
814                 goto err;
815         }
816         mutex_init(&fsl_otg_tc->fsm.lock);
817 
818         /* Set OTG state machine operations */
819         fsl_otg_tc->fsm.ops = &fsl_otg_ops;
820 
821         /* initialize the otg structure */
822         fsl_otg_tc->phy.label = DRIVER_DESC;
823         fsl_otg_tc->phy.dev = &pdev->dev;
824         fsl_otg_tc->phy.set_power = fsl_otg_set_power;
825 
826         fsl_otg_tc->phy.otg->usb_phy = &fsl_otg_tc->phy;
827         fsl_otg_tc->phy.otg->set_host = fsl_otg_set_host;
828         fsl_otg_tc->phy.otg->set_peripheral = fsl_otg_set_peripheral;
829         fsl_otg_tc->phy.otg->start_hnp = fsl_otg_start_hnp;
830         fsl_otg_tc->phy.otg->start_srp = fsl_otg_start_srp;
831 
832         fsl_otg_dev = fsl_otg_tc;
833 
834         /* Store the otg transceiver */
835         status = usb_add_phy(&fsl_otg_tc->phy, USB_PHY_TYPE_USB2);
836         if (status) {
837                 pr_warn(FSL_OTG_NAME ": unable to register OTG transceiver.\n");
838                 goto err;
839         }
840 
841         return 0;
842 err:
843         fsl_otg_uninit_timers();
844         kfree(fsl_otg_tc->phy.otg);
845         kfree(fsl_otg_tc);
846         return status;
847 }
848 
849 /* OTG Initialization */
850 int usb_otg_start(struct platform_device *pdev)
851 {
852         struct fsl_otg *p_otg;
853         struct usb_phy *otg_trans = usb_get_phy(USB_PHY_TYPE_USB2);
854         struct otg_fsm *fsm;
855         int status;
856         struct resource *res;
857         u32 temp;
858         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
859 
860         p_otg = container_of(otg_trans, struct fsl_otg, phy);
861         fsm = &p_otg->fsm;
862 
863         /* Initialize the state machine structure with default values */
864         SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
865         fsm->otg = p_otg->phy.otg;
866 
867         /* We don't require predefined MEM/IRQ resource index */
868         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
869         if (!res)
870                 return -ENXIO;
871 
872         /* We don't request_mem_region here to enable resource sharing
873          * with host/device */
874 
875         usb_dr_regs = ioremap(res->start, sizeof(struct usb_dr_mmap));
876         p_otg->dr_mem_map = (struct usb_dr_mmap *)usb_dr_regs;
877         pdata->regs = (void *)usb_dr_regs;
878 
879         if (pdata->init && pdata->init(pdev) != 0)
880                 return -EINVAL;
881 
882         if (pdata->big_endian_mmio) {
883                 _fsl_readl = _fsl_readl_be;
884                 _fsl_writel = _fsl_writel_be;
885         } else {
886                 _fsl_readl = _fsl_readl_le;
887                 _fsl_writel = _fsl_writel_le;
888         }
889 
890         /* request irq */
891         p_otg->irq = platform_get_irq(pdev, 0);
892         status = request_irq(p_otg->irq, fsl_otg_isr,
893                                 IRQF_SHARED, driver_name, p_otg);
894         if (status) {
895                 dev_dbg(p_otg->phy.dev, "can't get IRQ %d, error %d\n",
896                         p_otg->irq, status);
897                 iounmap(p_otg->dr_mem_map);
898                 kfree(p_otg->phy.otg);
899                 kfree(p_otg);
900                 return status;
901         }
902 
903         /* stop the controller */
904         temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
905         temp &= ~USB_CMD_RUN_STOP;
906         fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
907 
908         /* reset the controller */
909         temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
910         temp |= USB_CMD_CTRL_RESET;
911         fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
912 
913         /* wait reset completed */
914         while (fsl_readl(&p_otg->dr_mem_map->usbcmd) & USB_CMD_CTRL_RESET)
915                 ;
916 
917         /* configure the VBUSHS as IDLE(both host and device) */
918         temp = USB_MODE_STREAM_DISABLE | (pdata->es ? USB_MODE_ES : 0);
919         fsl_writel(temp, &p_otg->dr_mem_map->usbmode);
920 
921         /* configure PHY interface */
922         temp = fsl_readl(&p_otg->dr_mem_map->portsc);
923         temp &= ~(PORTSC_PHY_TYPE_SEL | PORTSC_PTW);
924         switch (pdata->phy_mode) {
925         case FSL_USB2_PHY_ULPI:
926                 temp |= PORTSC_PTS_ULPI;
927                 break;
928         case FSL_USB2_PHY_UTMI_WIDE:
929                 temp |= PORTSC_PTW_16BIT;
930                 /* fall through */
931         case FSL_USB2_PHY_UTMI:
932                 temp |= PORTSC_PTS_UTMI;
933                 /* fall through */
934         default:
935                 break;
936         }
937         fsl_writel(temp, &p_otg->dr_mem_map->portsc);
938 
939         if (pdata->have_sysif_regs) {
940                 /* configure control enable IO output, big endian register */
941                 temp = __raw_readl(&p_otg->dr_mem_map->control);
942                 temp |= USB_CTRL_IOENB;
943                 __raw_writel(temp, &p_otg->dr_mem_map->control);
944         }
945 
946         /* disable all interrupt and clear all OTGSC status */
947         temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
948         temp &= ~OTGSC_INTERRUPT_ENABLE_BITS_MASK;
949         temp |= OTGSC_INTERRUPT_STATUS_BITS_MASK | OTGSC_CTRL_VBUS_DISCHARGE;
950         fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
951 
952         /*
953          * The identification (id) input is FALSE when a Mini-A plug is inserted
954          * in the devices Mini-AB receptacle. Otherwise, this input is TRUE.
955          * Also: record initial state of ID pin
956          */
957         if (fsl_readl(&p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
958                 p_otg->phy.otg->state = OTG_STATE_UNDEFINED;
959                 p_otg->fsm.id = 1;
960         } else {
961                 p_otg->phy.otg->state = OTG_STATE_A_IDLE;
962                 p_otg->fsm.id = 0;
963         }
964 
965         pr_debug("initial ID pin=%d\n", p_otg->fsm.id);
966 
967         /* enable OTG ID pin interrupt */
968         temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
969         temp |= OTGSC_INTR_USB_ID_EN;
970         temp &= ~(OTGSC_CTRL_VBUS_DISCHARGE | OTGSC_INTR_1MS_TIMER_EN);
971         fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
972 
973         return 0;
974 }
975 
976 /*
977  * state file in sysfs
978  */
979 static int show_fsl_usb2_otg_state(struct device *dev,
980                                    struct device_attribute *attr, char *buf)
981 {
982         struct otg_fsm *fsm = &fsl_otg_dev->fsm;
983         char *next = buf;
984         unsigned size = PAGE_SIZE;
985         int t;
986 
987         mutex_lock(&fsm->lock);
988 
989         /* basic driver infomation */
990         t = scnprintf(next, size,
991                         DRIVER_DESC "\n" "fsl_usb2_otg version: %s\n\n",
992                         DRIVER_VERSION);
993         size -= t;
994         next += t;
995 
996         /* Registers */
997         t = scnprintf(next, size,
998                         "OTGSC:   0x%08x\n"
999                         "PORTSC:  0x%08x\n"
1000                         "USBMODE: 0x%08x\n"
1001                         "USBCMD:  0x%08x\n"
1002                         "USBSTS:  0x%08x\n"
1003                         "USBINTR: 0x%08x\n",
1004                         fsl_readl(&usb_dr_regs->otgsc),
1005                         fsl_readl(&usb_dr_regs->portsc),
1006                         fsl_readl(&usb_dr_regs->usbmode),
1007                         fsl_readl(&usb_dr_regs->usbcmd),
1008                         fsl_readl(&usb_dr_regs->usbsts),
1009                         fsl_readl(&usb_dr_regs->usbintr));
1010         size -= t;
1011         next += t;
1012 
1013         /* State */
1014         t = scnprintf(next, size,
1015                       "OTG state: %s\n\n",
1016                       usb_otg_state_string(fsl_otg_dev->phy.otg->state));
1017         size -= t;
1018         next += t;
1019 
1020         /* State Machine Variables */
1021         t = scnprintf(next, size,
1022                         "a_bus_req: %d\n"
1023                         "b_bus_req: %d\n"
1024                         "a_bus_resume: %d\n"
1025                         "a_bus_suspend: %d\n"
1026                         "a_conn: %d\n"
1027                         "a_sess_vld: %d\n"
1028                         "a_srp_det: %d\n"
1029                         "a_vbus_vld: %d\n"
1030                         "b_bus_resume: %d\n"
1031                         "b_bus_suspend: %d\n"
1032                         "b_conn: %d\n"
1033                         "b_se0_srp: %d\n"
1034                         "b_ssend_srp: %d\n"
1035                         "b_sess_vld: %d\n"
1036                         "id: %d\n",
1037                         fsm->a_bus_req,
1038                         fsm->b_bus_req,
1039                         fsm->a_bus_resume,
1040                         fsm->a_bus_suspend,
1041                         fsm->a_conn,
1042                         fsm->a_sess_vld,
1043                         fsm->a_srp_det,
1044                         fsm->a_vbus_vld,
1045                         fsm->b_bus_resume,
1046                         fsm->b_bus_suspend,
1047                         fsm->b_conn,
1048                         fsm->b_se0_srp,
1049                         fsm->b_ssend_srp,
1050                         fsm->b_sess_vld,
1051                         fsm->id);
1052         size -= t;
1053         next += t;
1054 
1055         mutex_unlock(&fsm->lock);
1056 
1057         return PAGE_SIZE - size;
1058 }
1059 
1060 static DEVICE_ATTR(fsl_usb2_otg_state, S_IRUGO, show_fsl_usb2_otg_state, NULL);
1061 
1062 
1063 /* Char driver interface to control some OTG input */
1064 
1065 /*
1066  * Handle some ioctl command, such as get otg
1067  * status and set host suspend
1068  */
1069 static long fsl_otg_ioctl(struct file *file, unsigned int cmd,
1070                           unsigned long arg)
1071 {
1072         u32 retval = 0;
1073 
1074         switch (cmd) {
1075         case GET_OTG_STATUS:
1076                 retval = fsl_otg_dev->host_working;
1077                 break;
1078 
1079         case SET_A_SUSPEND_REQ:
1080                 fsl_otg_dev->fsm.a_suspend_req_inf = arg;
1081                 break;
1082 
1083         case SET_A_BUS_DROP:
1084                 fsl_otg_dev->fsm.a_bus_drop = arg;
1085                 break;
1086 
1087         case SET_A_BUS_REQ:
1088                 fsl_otg_dev->fsm.a_bus_req = arg;
1089                 break;
1090 
1091         case SET_B_BUS_REQ:
1092                 fsl_otg_dev->fsm.b_bus_req = arg;
1093                 break;
1094 
1095         default:
1096                 break;
1097         }
1098 
1099         otg_statemachine(&fsl_otg_dev->fsm);
1100 
1101         return retval;
1102 }
1103 
1104 static int fsl_otg_open(struct inode *inode, struct file *file)
1105 {
1106         return 0;
1107 }
1108 
1109 static int fsl_otg_release(struct inode *inode, struct file *file)
1110 {
1111         return 0;
1112 }
1113 
1114 static const struct file_operations otg_fops = {
1115         .owner = THIS_MODULE,
1116         .llseek = NULL,
1117         .read = NULL,
1118         .write = NULL,
1119         .unlocked_ioctl = fsl_otg_ioctl,
1120         .open = fsl_otg_open,
1121         .release = fsl_otg_release,
1122 };
1123 
1124 static int fsl_otg_probe(struct platform_device *pdev)
1125 {
1126         int ret;
1127 
1128         if (!dev_get_platdata(&pdev->dev))
1129                 return -ENODEV;
1130 
1131         /* configure the OTG */
1132         ret = fsl_otg_conf(pdev);
1133         if (ret) {
1134                 dev_err(&pdev->dev, "Couldn't configure OTG module\n");
1135                 return ret;
1136         }
1137 
1138         /* start OTG */
1139         ret = usb_otg_start(pdev);
1140         if (ret) {
1141                 dev_err(&pdev->dev, "Can't init FSL OTG device\n");
1142                 return ret;
1143         }
1144 
1145         ret = register_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME, &otg_fops);
1146         if (ret) {
1147                 dev_err(&pdev->dev, "unable to register FSL OTG device\n");
1148                 return ret;
1149         }
1150 
1151         ret = device_create_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
1152         if (ret)
1153                 dev_warn(&pdev->dev, "Can't register sysfs attribute\n");
1154 
1155         return ret;
1156 }
1157 
1158 static int fsl_otg_remove(struct platform_device *pdev)
1159 {
1160         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
1161 
1162         usb_remove_phy(&fsl_otg_dev->phy);
1163         free_irq(fsl_otg_dev->irq, fsl_otg_dev);
1164 
1165         iounmap((void *)usb_dr_regs);
1166 
1167         fsl_otg_uninit_timers();
1168         kfree(fsl_otg_dev->phy.otg);
1169         kfree(fsl_otg_dev);
1170 
1171         device_remove_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
1172 
1173         unregister_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME);
1174 
1175         if (pdata->exit)
1176                 pdata->exit(pdev);
1177 
1178         return 0;
1179 }
1180 
1181 struct platform_driver fsl_otg_driver = {
1182         .probe = fsl_otg_probe,
1183         .remove = fsl_otg_remove,
1184         .driver = {
1185                 .name = driver_name,
1186                 .owner = THIS_MODULE,
1187         },
1188 };
1189 
1190 module_platform_driver(fsl_otg_driver);
1191 
1192 MODULE_DESCRIPTION(DRIVER_INFO);
1193 MODULE_AUTHOR(DRIVER_AUTHOR);
1194 MODULE_LICENSE("GPL");
1195 

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