Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

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 /* Routines to access transceiver ULPI registers */
111 u8 view_ulpi(u8 addr)
112 {
113         u32 temp;
114 
115         temp = 0x40000000 | (addr << 16);
116         fsl_writel(temp, &usb_dr_regs->ulpiview);
117         udelay(1000);
118         while (temp & 0x40)
119                 temp = fsl_readl(&usb_dr_regs->ulpiview);
120         return (le32_to_cpu(temp) & 0x0000ff00) >> 8;
121 }
122 
123 int write_ulpi(u8 addr, u8 data)
124 {
125         u32 temp;
126 
127         temp = 0x60000000 | (addr << 16) | data;
128         fsl_writel(temp, &usb_dr_regs->ulpiview);
129         return 0;
130 }
131 
132 /* -------------------------------------------------------------*/
133 /* Operations that will be called from OTG Finite State Machine */
134 
135 /* Charge vbus for vbus pulsing in SRP */
136 void fsl_otg_chrg_vbus(struct otg_fsm *fsm, int on)
137 {
138         u32 tmp;
139 
140         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
141 
142         if (on)
143                 /* stop discharging, start charging */
144                 tmp = (tmp & ~OTGSC_CTRL_VBUS_DISCHARGE) |
145                         OTGSC_CTRL_VBUS_CHARGE;
146         else
147                 /* stop charging */
148                 tmp &= ~OTGSC_CTRL_VBUS_CHARGE;
149 
150         fsl_writel(tmp, &usb_dr_regs->otgsc);
151 }
152 
153 /* Discharge vbus through a resistor to ground */
154 void fsl_otg_dischrg_vbus(int on)
155 {
156         u32 tmp;
157 
158         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
159 
160         if (on)
161                 /* stop charging, start discharging */
162                 tmp = (tmp & ~OTGSC_CTRL_VBUS_CHARGE) |
163                         OTGSC_CTRL_VBUS_DISCHARGE;
164         else
165                 /* stop discharging */
166                 tmp &= ~OTGSC_CTRL_VBUS_DISCHARGE;
167 
168         fsl_writel(tmp, &usb_dr_regs->otgsc);
169 }
170 
171 /* A-device driver vbus, controlled through PP bit in PORTSC */
172 void fsl_otg_drv_vbus(struct otg_fsm *fsm, int on)
173 {
174         u32 tmp;
175 
176         if (on) {
177                 tmp = fsl_readl(&usb_dr_regs->portsc) & ~PORTSC_W1C_BITS;
178                 fsl_writel(tmp | PORTSC_PORT_POWER, &usb_dr_regs->portsc);
179         } else {
180                 tmp = fsl_readl(&usb_dr_regs->portsc) &
181                       ~PORTSC_W1C_BITS & ~PORTSC_PORT_POWER;
182                 fsl_writel(tmp, &usb_dr_regs->portsc);
183         }
184 }
185 
186 /*
187  * Pull-up D+, signalling connect by periperal. Also used in
188  * data-line pulsing in SRP
189  */
190 void fsl_otg_loc_conn(struct otg_fsm *fsm, int on)
191 {
192         u32 tmp;
193 
194         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
195 
196         if (on)
197                 tmp |= OTGSC_CTRL_DATA_PULSING;
198         else
199                 tmp &= ~OTGSC_CTRL_DATA_PULSING;
200 
201         fsl_writel(tmp, &usb_dr_regs->otgsc);
202 }
203 
204 /*
205  * Generate SOF by host.  This is controlled through suspend/resume the
206  * port.  In host mode, controller will automatically send SOF.
207  * Suspend will block the data on the port.
208  */
209 void fsl_otg_loc_sof(struct otg_fsm *fsm, int on)
210 {
211         u32 tmp;
212 
213         tmp = fsl_readl(&fsl_otg_dev->dr_mem_map->portsc) & ~PORTSC_W1C_BITS;
214         if (on)
215                 tmp |= PORTSC_PORT_FORCE_RESUME;
216         else
217                 tmp |= PORTSC_PORT_SUSPEND;
218 
219         fsl_writel(tmp, &fsl_otg_dev->dr_mem_map->portsc);
220 
221 }
222 
223 /* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
224 void fsl_otg_start_pulse(struct otg_fsm *fsm)
225 {
226         u32 tmp;
227 
228         srp_wait_done = 0;
229 #ifdef HA_DATA_PULSE
230         tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
231         tmp |= OTGSC_HA_DATA_PULSE;
232         fsl_writel(tmp, &usb_dr_regs->otgsc);
233 #else
234         fsl_otg_loc_conn(1);
235 #endif
236 
237         fsl_otg_add_timer(fsm, b_data_pulse_tmr);
238 }
239 
240 void b_data_pulse_end(unsigned long foo)
241 {
242 #ifdef HA_DATA_PULSE
243 #else
244         fsl_otg_loc_conn(0);
245 #endif
246 
247         /* Do VBUS pulse after data pulse */
248         fsl_otg_pulse_vbus();
249 }
250 
251 void fsl_otg_pulse_vbus(void)
252 {
253         srp_wait_done = 0;
254         fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 1);
255         /* start the timer to end vbus charge */
256         fsl_otg_add_timer(&fsl_otg_dev->fsm, b_vbus_pulse_tmr);
257 }
258 
259 void b_vbus_pulse_end(unsigned long foo)
260 {
261         fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 0);
262 
263         /*
264          * As USB3300 using the same a_sess_vld and b_sess_vld voltage
265          * we need to discharge the bus for a while to distinguish
266          * residual voltage of vbus pulsing and A device pull up
267          */
268         fsl_otg_dischrg_vbus(1);
269         fsl_otg_add_timer(&fsl_otg_dev->fsm, b_srp_wait_tmr);
270 }
271 
272 void b_srp_end(unsigned long foo)
273 {
274         fsl_otg_dischrg_vbus(0);
275         srp_wait_done = 1;
276 
277         if ((fsl_otg_dev->phy.otg->state == OTG_STATE_B_SRP_INIT) &&
278             fsl_otg_dev->fsm.b_sess_vld)
279                 fsl_otg_dev->fsm.b_srp_done = 1;
280 }
281 
282 /*
283  * Workaround for a_host suspending too fast.  When a_bus_req=0,
284  * a_host will start by SRP.  It needs to set b_hnp_enable before
285  * actually suspending to start HNP
286  */
287 void a_wait_enum(unsigned long foo)
288 {
289         VDBG("a_wait_enum timeout\n");
290         if (!fsl_otg_dev->phy.otg->host->b_hnp_enable)
291                 fsl_otg_add_timer(&fsl_otg_dev->fsm, a_wait_enum_tmr);
292         else
293                 otg_statemachine(&fsl_otg_dev->fsm);
294 }
295 
296 /* The timeout callback function to set time out bit */
297 void set_tmout(unsigned long indicator)
298 {
299         *(int *)indicator = 1;
300 }
301 
302 /* Initialize timers */
303 int fsl_otg_init_timers(struct otg_fsm *fsm)
304 {
305         /* FSM used timers */
306         a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
307                                 (unsigned long)&fsm->a_wait_vrise_tmout);
308         if (!a_wait_vrise_tmr)
309                 return -ENOMEM;
310 
311         a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
312                                 (unsigned long)&fsm->a_wait_bcon_tmout);
313         if (!a_wait_bcon_tmr)
314                 return -ENOMEM;
315 
316         a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
317                                 (unsigned long)&fsm->a_aidl_bdis_tmout);
318         if (!a_aidl_bdis_tmr)
319                 return -ENOMEM;
320 
321         b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
322                                 (unsigned long)&fsm->b_ase0_brst_tmout);
323         if (!b_ase0_brst_tmr)
324                 return -ENOMEM;
325 
326         b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
327                                 (unsigned long)&fsm->b_se0_srp);
328         if (!b_se0_srp_tmr)
329                 return -ENOMEM;
330 
331         b_srp_fail_tmr = otg_timer_initializer(&set_tmout, TB_SRP_FAIL,
332                                 (unsigned long)&fsm->b_srp_done);
333         if (!b_srp_fail_tmr)
334                 return -ENOMEM;
335 
336         a_wait_enum_tmr = otg_timer_initializer(&a_wait_enum, 10,
337                                 (unsigned long)&fsm);
338         if (!a_wait_enum_tmr)
339                 return -ENOMEM;
340 
341         /* device driver used timers */
342         b_srp_wait_tmr = otg_timer_initializer(&b_srp_end, TB_SRP_WAIT, 0);
343         if (!b_srp_wait_tmr)
344                 return -ENOMEM;
345 
346         b_data_pulse_tmr = otg_timer_initializer(&b_data_pulse_end,
347                                 TB_DATA_PLS, 0);
348         if (!b_data_pulse_tmr)
349                 return -ENOMEM;
350 
351         b_vbus_pulse_tmr = otg_timer_initializer(&b_vbus_pulse_end,
352                                 TB_VBUS_PLS, 0);
353         if (!b_vbus_pulse_tmr)
354                 return -ENOMEM;
355 
356         return 0;
357 }
358 
359 /* Uninitialize timers */
360 void fsl_otg_uninit_timers(void)
361 {
362         /* FSM used timers */
363         kfree(a_wait_vrise_tmr);
364         kfree(a_wait_bcon_tmr);
365         kfree(a_aidl_bdis_tmr);
366         kfree(b_ase0_brst_tmr);
367         kfree(b_se0_srp_tmr);
368         kfree(b_srp_fail_tmr);
369         kfree(a_wait_enum_tmr);
370 
371         /* device driver used timers */
372         kfree(b_srp_wait_tmr);
373         kfree(b_data_pulse_tmr);
374         kfree(b_vbus_pulse_tmr);
375 }
376 
377 static struct fsl_otg_timer *fsl_otg_get_timer(enum otg_fsm_timer t)
378 {
379         struct fsl_otg_timer *timer;
380 
381         /* REVISIT: use array of pointers to timers instead */
382         switch (t) {
383         case A_WAIT_VRISE:
384                 timer = a_wait_vrise_tmr;
385                 break;
386         case A_WAIT_BCON:
387                 timer = a_wait_vrise_tmr;
388                 break;
389         case A_AIDL_BDIS:
390                 timer = a_wait_vrise_tmr;
391                 break;
392         case B_ASE0_BRST:
393                 timer = a_wait_vrise_tmr;
394                 break;
395         case B_SE0_SRP:
396                 timer = a_wait_vrise_tmr;
397                 break;
398         case B_SRP_FAIL:
399                 timer = a_wait_vrise_tmr;
400                 break;
401         case A_WAIT_ENUM:
402                 timer = a_wait_vrise_tmr;
403                 break;
404         default:
405                 timer = NULL;
406         }
407 
408         return timer;
409 }
410 
411 /* Add timer to timer list */
412 void fsl_otg_add_timer(struct otg_fsm *fsm, void *gtimer)
413 {
414         struct fsl_otg_timer *timer = gtimer;
415         struct fsl_otg_timer *tmp_timer;
416 
417         /*
418          * Check if the timer is already in the active list,
419          * if so update timer count
420          */
421         list_for_each_entry(tmp_timer, &active_timers, list)
422             if (tmp_timer == timer) {
423                 timer->count = timer->expires;
424                 return;
425         }
426         timer->count = timer->expires;
427         list_add_tail(&timer->list, &active_timers);
428 }
429 
430 static void fsl_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
431 {
432         struct fsl_otg_timer *timer;
433 
434         timer = fsl_otg_get_timer(t);
435         if (!timer)
436                 return;
437 
438         fsl_otg_add_timer(fsm, timer);
439 }
440 
441 /* Remove timer from the timer list; clear timeout status */
442 void fsl_otg_del_timer(struct otg_fsm *fsm, void *gtimer)
443 {
444         struct fsl_otg_timer *timer = gtimer;
445         struct fsl_otg_timer *tmp_timer, *del_tmp;
446 
447         list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
448                 if (tmp_timer == timer)
449                         list_del(&timer->list);
450 }
451 
452 static void fsl_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
453 {
454         struct fsl_otg_timer *timer;
455 
456         timer = fsl_otg_get_timer(t);
457         if (!timer)
458                 return;
459 
460         fsl_otg_del_timer(fsm, timer);
461 }
462 
463 /*
464  * Reduce timer count by 1, and find timeout conditions.
465  * Called by fsl_otg 1ms timer interrupt
466  */
467 int fsl_otg_tick_timer(void)
468 {
469         struct fsl_otg_timer *tmp_timer, *del_tmp;
470         int expired = 0;
471 
472         list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list) {
473                 tmp_timer->count--;
474                 /* check if timer expires */
475                 if (!tmp_timer->count) {
476                         list_del(&tmp_timer->list);
477                         tmp_timer->function(tmp_timer->data);
478                         expired = 1;
479                 }
480         }
481 
482         return expired;
483 }
484 
485 /* Reset controller, not reset the bus */
486 void otg_reset_controller(void)
487 {
488         u32 command;
489 
490         command = fsl_readl(&usb_dr_regs->usbcmd);
491         command |= (1 << 1);
492         fsl_writel(command, &usb_dr_regs->usbcmd);
493         while (fsl_readl(&usb_dr_regs->usbcmd) & (1 << 1))
494                 ;
495 }
496 
497 /* Call suspend/resume routines in host driver */
498 int fsl_otg_start_host(struct otg_fsm *fsm, int on)
499 {
500         struct usb_otg *otg = fsm->otg;
501         struct device *dev;
502         struct fsl_otg *otg_dev =
503                 container_of(otg->usb_phy, struct fsl_otg, phy);
504         u32 retval = 0;
505 
506         if (!otg->host)
507                 return -ENODEV;
508         dev = otg->host->controller;
509 
510         /*
511          * Update a_vbus_vld state as a_vbus_vld int is disabled
512          * in device mode
513          */
514         fsm->a_vbus_vld =
515                 !!(fsl_readl(&usb_dr_regs->otgsc) & OTGSC_STS_A_VBUS_VALID);
516         if (on) {
517                 /* start fsl usb host controller */
518                 if (otg_dev->host_working)
519                         goto end;
520                 else {
521                         otg_reset_controller();
522                         VDBG("host on......\n");
523                         if (dev->driver->pm && dev->driver->pm->resume) {
524                                 retval = dev->driver->pm->resume(dev);
525                                 if (fsm->id) {
526                                         /* default-b */
527                                         fsl_otg_drv_vbus(fsm, 1);
528                                         /*
529                                          * Workaround: b_host can't driver
530                                          * vbus, but PP in PORTSC needs to
531                                          * be 1 for host to work.
532                                          * So we set drv_vbus bit in
533                                          * transceiver to 0 thru ULPI.
534                                          */
535                                         write_ulpi(0x0c, 0x20);
536                                 }
537                         }
538 
539                         otg_dev->host_working = 1;
540                 }
541         } else {
542                 /* stop fsl usb host controller */
543                 if (!otg_dev->host_working)
544                         goto end;
545                 else {
546                         VDBG("host off......\n");
547                         if (dev && dev->driver) {
548                                 if (dev->driver->pm && dev->driver->pm->suspend)
549                                         retval = dev->driver->pm->suspend(dev);
550                                 if (fsm->id)
551                                         /* default-b */
552                                         fsl_otg_drv_vbus(fsm, 0);
553                         }
554                         otg_dev->host_working = 0;
555                 }
556         }
557 end:
558         return retval;
559 }
560 
561 /*
562  * Call suspend and resume function in udc driver
563  * to stop and start udc driver.
564  */
565 int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
566 {
567         struct usb_otg *otg = fsm->otg;
568         struct device *dev;
569 
570         if (!otg->gadget || !otg->gadget->dev.parent)
571                 return -ENODEV;
572 
573         VDBG("gadget %s\n", on ? "on" : "off");
574         dev = otg->gadget->dev.parent;
575 
576         if (on) {
577                 if (dev->driver->resume)
578                         dev->driver->resume(dev);
579         } else {
580                 if (dev->driver->suspend)
581                         dev->driver->suspend(dev, otg_suspend_state);
582         }
583 
584         return 0;
585 }
586 
587 /*
588  * Called by initialization code of host driver.  Register host controller
589  * to the OTG.  Suspend host for OTG role detection.
590  */
591 static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
592 {
593         struct fsl_otg *otg_dev;
594 
595         if (!otg)
596                 return -ENODEV;
597 
598         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
599         if (otg_dev != fsl_otg_dev)
600                 return -ENODEV;
601 
602         otg->host = host;
603 
604         otg_dev->fsm.a_bus_drop = 0;
605         otg_dev->fsm.a_bus_req = 1;
606 
607         if (host) {
608                 VDBG("host off......\n");
609 
610                 otg->host->otg_port = fsl_otg_initdata.otg_port;
611                 otg->host->is_b_host = otg_dev->fsm.id;
612                 /*
613                  * must leave time for hub_wq to finish its thing
614                  * before yanking the host driver out from under it,
615                  * so suspend the host after a short delay.
616                  */
617                 otg_dev->host_working = 1;
618                 schedule_delayed_work(&otg_dev->otg_event, 100);
619                 return 0;
620         } else {
621                 /* host driver going away */
622                 if (!(fsl_readl(&otg_dev->dr_mem_map->otgsc) &
623                       OTGSC_STS_USB_ID)) {
624                         /* Mini-A cable connected */
625                         struct otg_fsm *fsm = &otg_dev->fsm;
626 
627                         otg->state = OTG_STATE_UNDEFINED;
628                         fsm->protocol = PROTO_UNDEF;
629                 }
630         }
631 
632         otg_dev->host_working = 0;
633 
634         otg_statemachine(&otg_dev->fsm);
635 
636         return 0;
637 }
638 
639 /* Called by initialization code of udc.  Register udc to OTG. */
640 static int fsl_otg_set_peripheral(struct usb_otg *otg,
641                                         struct usb_gadget *gadget)
642 {
643         struct fsl_otg *otg_dev;
644 
645         if (!otg)
646                 return -ENODEV;
647 
648         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
649         VDBG("otg_dev 0x%x\n", (int)otg_dev);
650         VDBG("fsl_otg_dev 0x%x\n", (int)fsl_otg_dev);
651         if (otg_dev != fsl_otg_dev)
652                 return -ENODEV;
653 
654         if (!gadget) {
655                 if (!otg->default_a)
656                         otg->gadget->ops->vbus_draw(otg->gadget, 0);
657                 usb_gadget_vbus_disconnect(otg->gadget);
658                 otg->gadget = 0;
659                 otg_dev->fsm.b_bus_req = 0;
660                 otg_statemachine(&otg_dev->fsm);
661                 return 0;
662         }
663 
664         otg->gadget = gadget;
665         otg->gadget->is_a_peripheral = !otg_dev->fsm.id;
666 
667         otg_dev->fsm.b_bus_req = 1;
668 
669         /* start the gadget right away if the ID pin says Mini-B */
670         pr_debug("ID pin=%d\n", otg_dev->fsm.id);
671         if (otg_dev->fsm.id == 1) {
672                 fsl_otg_start_host(&otg_dev->fsm, 0);
673                 otg_drv_vbus(&otg_dev->fsm, 0);
674                 fsl_otg_start_gadget(&otg_dev->fsm, 1);
675         }
676 
677         return 0;
678 }
679 
680 /* Set OTG port power, only for B-device */
681 static int fsl_otg_set_power(struct usb_phy *phy, unsigned mA)
682 {
683         if (!fsl_otg_dev)
684                 return -ENODEV;
685         if (phy->otg->state == OTG_STATE_B_PERIPHERAL)
686                 pr_info("FSL OTG: Draw %d mA\n", mA);
687 
688         return 0;
689 }
690 
691 /*
692  * Delayed pin detect interrupt processing.
693  *
694  * When the Mini-A cable is disconnected from the board,
695  * the pin-detect interrupt happens before the disconnect
696  * interrupts for the connected device(s).  In order to
697  * process the disconnect interrupt(s) prior to switching
698  * roles, the pin-detect interrupts are delayed, and handled
699  * by this routine.
700  */
701 static void fsl_otg_event(struct work_struct *work)
702 {
703         struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
704         struct otg_fsm *fsm = &og->fsm;
705 
706         if (fsm->id) {          /* switch to gadget */
707                 fsl_otg_start_host(fsm, 0);
708                 otg_drv_vbus(fsm, 0);
709                 fsl_otg_start_gadget(fsm, 1);
710         }
711 }
712 
713 /* B-device start SRP */
714 static int fsl_otg_start_srp(struct usb_otg *otg)
715 {
716         struct fsl_otg *otg_dev;
717 
718         if (!otg || otg->state != OTG_STATE_B_IDLE)
719                 return -ENODEV;
720 
721         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
722         if (otg_dev != fsl_otg_dev)
723                 return -ENODEV;
724 
725         otg_dev->fsm.b_bus_req = 1;
726         otg_statemachine(&otg_dev->fsm);
727 
728         return 0;
729 }
730 
731 /* A_host suspend will call this function to start hnp */
732 static int fsl_otg_start_hnp(struct usb_otg *otg)
733 {
734         struct fsl_otg *otg_dev;
735 
736         if (!otg)
737                 return -ENODEV;
738 
739         otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
740         if (otg_dev != fsl_otg_dev)
741                 return -ENODEV;
742 
743         pr_debug("start_hnp...\n");
744 
745         /* clear a_bus_req to enter a_suspend state */
746         otg_dev->fsm.a_bus_req = 0;
747         otg_statemachine(&otg_dev->fsm);
748 
749         return 0;
750 }
751 
752 /*
753  * Interrupt handler.  OTG/host/peripheral share the same int line.
754  * OTG driver clears OTGSC interrupts and leaves USB interrupts
755  * intact.  It needs to have knowledge of some USB interrupts
756  * such as port change.
757  */
758 irqreturn_t fsl_otg_isr(int irq, void *dev_id)
759 {
760         struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
761         struct usb_otg *otg = ((struct fsl_otg *)dev_id)->phy.otg;
762         u32 otg_int_src, otg_sc;
763 
764         otg_sc = fsl_readl(&usb_dr_regs->otgsc);
765         otg_int_src = otg_sc & OTGSC_INTSTS_MASK & (otg_sc >> 8);
766 
767         /* Only clear otg interrupts */
768         fsl_writel(otg_sc, &usb_dr_regs->otgsc);
769 
770         /*FIXME: ID change not generate when init to 0 */
771         fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
772         otg->default_a = (fsm->id == 0);
773 
774         /* process OTG interrupts */
775         if (otg_int_src) {
776                 if (otg_int_src & OTGSC_INTSTS_USB_ID) {
777                         fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
778                         otg->default_a = (fsm->id == 0);
779                         /* clear conn information */
780                         if (fsm->id)
781                                 fsm->b_conn = 0;
782                         else
783                                 fsm->a_conn = 0;
784 
785                         if (otg->host)
786                                 otg->host->is_b_host = fsm->id;
787                         if (otg->gadget)
788                                 otg->gadget->is_a_peripheral = !fsm->id;
789                         VDBG("ID int (ID is %d)\n", fsm->id);
790 
791                         if (fsm->id) {  /* switch to gadget */
792                                 schedule_delayed_work(
793                                         &((struct fsl_otg *)dev_id)->otg_event,
794                                         100);
795                         } else {        /* switch to host */
796                                 cancel_delayed_work(&
797                                                     ((struct fsl_otg *)dev_id)->
798                                                     otg_event);
799                                 fsl_otg_start_gadget(fsm, 0);
800                                 otg_drv_vbus(fsm, 1);
801                                 fsl_otg_start_host(fsm, 1);
802                         }
803                         return IRQ_HANDLED;
804                 }
805         }
806         return IRQ_NONE;
807 }
808 
809 static struct otg_fsm_ops fsl_otg_ops = {
810         .chrg_vbus = fsl_otg_chrg_vbus,
811         .drv_vbus = fsl_otg_drv_vbus,
812         .loc_conn = fsl_otg_loc_conn,
813         .loc_sof = fsl_otg_loc_sof,
814         .start_pulse = fsl_otg_start_pulse,
815 
816         .add_timer = fsl_otg_fsm_add_timer,
817         .del_timer = fsl_otg_fsm_del_timer,
818 
819         .start_host = fsl_otg_start_host,
820         .start_gadget = fsl_otg_start_gadget,
821 };
822 
823 /* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
824 static int fsl_otg_conf(struct platform_device *pdev)
825 {
826         struct fsl_otg *fsl_otg_tc;
827         int status;
828 
829         if (fsl_otg_dev)
830                 return 0;
831 
832         /* allocate space to fsl otg device */
833         fsl_otg_tc = kzalloc(sizeof(struct fsl_otg), GFP_KERNEL);
834         if (!fsl_otg_tc)
835                 return -ENOMEM;
836 
837         fsl_otg_tc->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
838         if (!fsl_otg_tc->phy.otg) {
839                 kfree(fsl_otg_tc);
840                 return -ENOMEM;
841         }
842 
843         INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);
844 
845         INIT_LIST_HEAD(&active_timers);
846         status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
847         if (status) {
848                 pr_info("Couldn't init OTG timers\n");
849                 goto err;
850         }
851         mutex_init(&fsl_otg_tc->fsm.lock);
852 
853         /* Set OTG state machine operations */
854         fsl_otg_tc->fsm.ops = &fsl_otg_ops;
855 
856         /* initialize the otg structure */
857         fsl_otg_tc->phy.label = DRIVER_DESC;
858         fsl_otg_tc->phy.dev = &pdev->dev;
859         fsl_otg_tc->phy.set_power = fsl_otg_set_power;
860 
861         fsl_otg_tc->phy.otg->usb_phy = &fsl_otg_tc->phy;
862         fsl_otg_tc->phy.otg->set_host = fsl_otg_set_host;
863         fsl_otg_tc->phy.otg->set_peripheral = fsl_otg_set_peripheral;
864         fsl_otg_tc->phy.otg->start_hnp = fsl_otg_start_hnp;
865         fsl_otg_tc->phy.otg->start_srp = fsl_otg_start_srp;
866 
867         fsl_otg_dev = fsl_otg_tc;
868 
869         /* Store the otg transceiver */
870         status = usb_add_phy(&fsl_otg_tc->phy, USB_PHY_TYPE_USB2);
871         if (status) {
872                 pr_warn(FSL_OTG_NAME ": unable to register OTG transceiver.\n");
873                 goto err;
874         }
875 
876         return 0;
877 err:
878         fsl_otg_uninit_timers();
879         kfree(fsl_otg_tc->phy.otg);
880         kfree(fsl_otg_tc);
881         return status;
882 }
883 
884 /* OTG Initialization */
885 int usb_otg_start(struct platform_device *pdev)
886 {
887         struct fsl_otg *p_otg;
888         struct usb_phy *otg_trans = usb_get_phy(USB_PHY_TYPE_USB2);
889         struct otg_fsm *fsm;
890         int status;
891         struct resource *res;
892         u32 temp;
893         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
894 
895         p_otg = container_of(otg_trans, struct fsl_otg, phy);
896         fsm = &p_otg->fsm;
897 
898         /* Initialize the state machine structure with default values */
899         SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
900         fsm->otg = p_otg->phy.otg;
901 
902         /* We don't require predefined MEM/IRQ resource index */
903         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
904         if (!res)
905                 return -ENXIO;
906 
907         /* We don't request_mem_region here to enable resource sharing
908          * with host/device */
909 
910         usb_dr_regs = ioremap(res->start, sizeof(struct usb_dr_mmap));
911         p_otg->dr_mem_map = (struct usb_dr_mmap *)usb_dr_regs;
912         pdata->regs = (void *)usb_dr_regs;
913 
914         if (pdata->init && pdata->init(pdev) != 0)
915                 return -EINVAL;
916 
917         if (pdata->big_endian_mmio) {
918                 _fsl_readl = _fsl_readl_be;
919                 _fsl_writel = _fsl_writel_be;
920         } else {
921                 _fsl_readl = _fsl_readl_le;
922                 _fsl_writel = _fsl_writel_le;
923         }
924 
925         /* request irq */
926         p_otg->irq = platform_get_irq(pdev, 0);
927         status = request_irq(p_otg->irq, fsl_otg_isr,
928                                 IRQF_SHARED, driver_name, p_otg);
929         if (status) {
930                 dev_dbg(p_otg->phy.dev, "can't get IRQ %d, error %d\n",
931                         p_otg->irq, status);
932                 iounmap(p_otg->dr_mem_map);
933                 kfree(p_otg->phy.otg);
934                 kfree(p_otg);
935                 return status;
936         }
937 
938         /* stop the controller */
939         temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
940         temp &= ~USB_CMD_RUN_STOP;
941         fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
942 
943         /* reset the controller */
944         temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
945         temp |= USB_CMD_CTRL_RESET;
946         fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
947 
948         /* wait reset completed */
949         while (fsl_readl(&p_otg->dr_mem_map->usbcmd) & USB_CMD_CTRL_RESET)
950                 ;
951 
952         /* configure the VBUSHS as IDLE(both host and device) */
953         temp = USB_MODE_STREAM_DISABLE | (pdata->es ? USB_MODE_ES : 0);
954         fsl_writel(temp, &p_otg->dr_mem_map->usbmode);
955 
956         /* configure PHY interface */
957         temp = fsl_readl(&p_otg->dr_mem_map->portsc);
958         temp &= ~(PORTSC_PHY_TYPE_SEL | PORTSC_PTW);
959         switch (pdata->phy_mode) {
960         case FSL_USB2_PHY_ULPI:
961                 temp |= PORTSC_PTS_ULPI;
962                 break;
963         case FSL_USB2_PHY_UTMI_WIDE:
964                 temp |= PORTSC_PTW_16BIT;
965                 /* fall through */
966         case FSL_USB2_PHY_UTMI:
967                 temp |= PORTSC_PTS_UTMI;
968                 /* fall through */
969         default:
970                 break;
971         }
972         fsl_writel(temp, &p_otg->dr_mem_map->portsc);
973 
974         if (pdata->have_sysif_regs) {
975                 /* configure control enable IO output, big endian register */
976                 temp = __raw_readl(&p_otg->dr_mem_map->control);
977                 temp |= USB_CTRL_IOENB;
978                 __raw_writel(temp, &p_otg->dr_mem_map->control);
979         }
980 
981         /* disable all interrupt and clear all OTGSC status */
982         temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
983         temp &= ~OTGSC_INTERRUPT_ENABLE_BITS_MASK;
984         temp |= OTGSC_INTERRUPT_STATUS_BITS_MASK | OTGSC_CTRL_VBUS_DISCHARGE;
985         fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
986 
987         /*
988          * The identification (id) input is FALSE when a Mini-A plug is inserted
989          * in the devices Mini-AB receptacle. Otherwise, this input is TRUE.
990          * Also: record initial state of ID pin
991          */
992         if (fsl_readl(&p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
993                 p_otg->phy.otg->state = OTG_STATE_UNDEFINED;
994                 p_otg->fsm.id = 1;
995         } else {
996                 p_otg->phy.otg->state = OTG_STATE_A_IDLE;
997                 p_otg->fsm.id = 0;
998         }
999 
1000         pr_debug("initial ID pin=%d\n", p_otg->fsm.id);
1001 
1002         /* enable OTG ID pin interrupt */
1003         temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
1004         temp |= OTGSC_INTR_USB_ID_EN;
1005         temp &= ~(OTGSC_CTRL_VBUS_DISCHARGE | OTGSC_INTR_1MS_TIMER_EN);
1006         fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
1007 
1008         return 0;
1009 }
1010 
1011 /*
1012  * state file in sysfs
1013  */
1014 static int show_fsl_usb2_otg_state(struct device *dev,
1015                                    struct device_attribute *attr, char *buf)
1016 {
1017         struct otg_fsm *fsm = &fsl_otg_dev->fsm;
1018         char *next = buf;
1019         unsigned size = PAGE_SIZE;
1020         int t;
1021 
1022         mutex_lock(&fsm->lock);
1023 
1024         /* basic driver infomation */
1025         t = scnprintf(next, size,
1026                         DRIVER_DESC "\n" "fsl_usb2_otg version: %s\n\n",
1027                         DRIVER_VERSION);
1028         size -= t;
1029         next += t;
1030 
1031         /* Registers */
1032         t = scnprintf(next, size,
1033                         "OTGSC:   0x%08x\n"
1034                         "PORTSC:  0x%08x\n"
1035                         "USBMODE: 0x%08x\n"
1036                         "USBCMD:  0x%08x\n"
1037                         "USBSTS:  0x%08x\n"
1038                         "USBINTR: 0x%08x\n",
1039                         fsl_readl(&usb_dr_regs->otgsc),
1040                         fsl_readl(&usb_dr_regs->portsc),
1041                         fsl_readl(&usb_dr_regs->usbmode),
1042                         fsl_readl(&usb_dr_regs->usbcmd),
1043                         fsl_readl(&usb_dr_regs->usbsts),
1044                         fsl_readl(&usb_dr_regs->usbintr));
1045         size -= t;
1046         next += t;
1047 
1048         /* State */
1049         t = scnprintf(next, size,
1050                       "OTG state: %s\n\n",
1051                       usb_otg_state_string(fsl_otg_dev->phy.otg->state));
1052         size -= t;
1053         next += t;
1054 
1055         /* State Machine Variables */
1056         t = scnprintf(next, size,
1057                         "a_bus_req: %d\n"
1058                         "b_bus_req: %d\n"
1059                         "a_bus_resume: %d\n"
1060                         "a_bus_suspend: %d\n"
1061                         "a_conn: %d\n"
1062                         "a_sess_vld: %d\n"
1063                         "a_srp_det: %d\n"
1064                         "a_vbus_vld: %d\n"
1065                         "b_bus_resume: %d\n"
1066                         "b_bus_suspend: %d\n"
1067                         "b_conn: %d\n"
1068                         "b_se0_srp: %d\n"
1069                         "b_ssend_srp: %d\n"
1070                         "b_sess_vld: %d\n"
1071                         "id: %d\n",
1072                         fsm->a_bus_req,
1073                         fsm->b_bus_req,
1074                         fsm->a_bus_resume,
1075                         fsm->a_bus_suspend,
1076                         fsm->a_conn,
1077                         fsm->a_sess_vld,
1078                         fsm->a_srp_det,
1079                         fsm->a_vbus_vld,
1080                         fsm->b_bus_resume,
1081                         fsm->b_bus_suspend,
1082                         fsm->b_conn,
1083                         fsm->b_se0_srp,
1084                         fsm->b_ssend_srp,
1085                         fsm->b_sess_vld,
1086                         fsm->id);
1087         size -= t;
1088         next += t;
1089 
1090         mutex_unlock(&fsm->lock);
1091 
1092         return PAGE_SIZE - size;
1093 }
1094 
1095 static DEVICE_ATTR(fsl_usb2_otg_state, S_IRUGO, show_fsl_usb2_otg_state, NULL);
1096 
1097 
1098 /* Char driver interface to control some OTG input */
1099 
1100 /*
1101  * Handle some ioctl command, such as get otg
1102  * status and set host suspend
1103  */
1104 static long fsl_otg_ioctl(struct file *file, unsigned int cmd,
1105                           unsigned long arg)
1106 {
1107         u32 retval = 0;
1108 
1109         switch (cmd) {
1110         case GET_OTG_STATUS:
1111                 retval = fsl_otg_dev->host_working;
1112                 break;
1113 
1114         case SET_A_SUSPEND_REQ:
1115                 fsl_otg_dev->fsm.a_suspend_req_inf = arg;
1116                 break;
1117 
1118         case SET_A_BUS_DROP:
1119                 fsl_otg_dev->fsm.a_bus_drop = arg;
1120                 break;
1121 
1122         case SET_A_BUS_REQ:
1123                 fsl_otg_dev->fsm.a_bus_req = arg;
1124                 break;
1125 
1126         case SET_B_BUS_REQ:
1127                 fsl_otg_dev->fsm.b_bus_req = arg;
1128                 break;
1129 
1130         default:
1131                 break;
1132         }
1133 
1134         otg_statemachine(&fsl_otg_dev->fsm);
1135 
1136         return retval;
1137 }
1138 
1139 static int fsl_otg_open(struct inode *inode, struct file *file)
1140 {
1141         return 0;
1142 }
1143 
1144 static int fsl_otg_release(struct inode *inode, struct file *file)
1145 {
1146         return 0;
1147 }
1148 
1149 static const struct file_operations otg_fops = {
1150         .owner = THIS_MODULE,
1151         .llseek = NULL,
1152         .read = NULL,
1153         .write = NULL,
1154         .unlocked_ioctl = fsl_otg_ioctl,
1155         .open = fsl_otg_open,
1156         .release = fsl_otg_release,
1157 };
1158 
1159 static int fsl_otg_probe(struct platform_device *pdev)
1160 {
1161         int ret;
1162 
1163         if (!dev_get_platdata(&pdev->dev))
1164                 return -ENODEV;
1165 
1166         /* configure the OTG */
1167         ret = fsl_otg_conf(pdev);
1168         if (ret) {
1169                 dev_err(&pdev->dev, "Couldn't configure OTG module\n");
1170                 return ret;
1171         }
1172 
1173         /* start OTG */
1174         ret = usb_otg_start(pdev);
1175         if (ret) {
1176                 dev_err(&pdev->dev, "Can't init FSL OTG device\n");
1177                 return ret;
1178         }
1179 
1180         ret = register_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME, &otg_fops);
1181         if (ret) {
1182                 dev_err(&pdev->dev, "unable to register FSL OTG device\n");
1183                 return ret;
1184         }
1185 
1186         ret = device_create_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
1187         if (ret)
1188                 dev_warn(&pdev->dev, "Can't register sysfs attribute\n");
1189 
1190         return ret;
1191 }
1192 
1193 static int fsl_otg_remove(struct platform_device *pdev)
1194 {
1195         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
1196 
1197         usb_remove_phy(&fsl_otg_dev->phy);
1198         free_irq(fsl_otg_dev->irq, fsl_otg_dev);
1199 
1200         iounmap((void *)usb_dr_regs);
1201 
1202         fsl_otg_uninit_timers();
1203         kfree(fsl_otg_dev->phy.otg);
1204         kfree(fsl_otg_dev);
1205 
1206         device_remove_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
1207 
1208         unregister_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME);
1209 
1210         if (pdata->exit)
1211                 pdata->exit(pdev);
1212 
1213         return 0;
1214 }
1215 
1216 struct platform_driver fsl_otg_driver = {
1217         .probe = fsl_otg_probe,
1218         .remove = fsl_otg_remove,
1219         .driver = {
1220                 .name = driver_name,
1221                 .owner = THIS_MODULE,
1222         },
1223 };
1224 
1225 module_platform_driver(fsl_otg_driver);
1226 
1227 MODULE_DESCRIPTION(DRIVER_INFO);
1228 MODULE_AUTHOR(DRIVER_AUTHOR);
1229 MODULE_LICENSE("GPL");
1230 

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