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Linux/drivers/usb/phy/phy-isp1301-omap.c

  1 /*
  2  * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
  3  *
  4  * Copyright (C) 2004 Texas Instruments
  5  * Copyright (C) 2004 David Brownell
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/init.h>
 25 #include <linux/slab.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/gpio.h>
 29 #include <linux/usb/ch9.h>
 30 #include <linux/usb/gadget.h>
 31 #include <linux/usb.h>
 32 #include <linux/usb/otg.h>
 33 #include <linux/i2c.h>
 34 #include <linux/workqueue.h>
 35 
 36 #include <asm/irq.h>
 37 #include <asm/mach-types.h>
 38 
 39 #include <mach/mux.h>
 40 
 41 #include <mach/usb.h>
 42 
 43 #undef VERBOSE
 44 
 45 
 46 #define DRIVER_VERSION  "24 August 2004"
 47 #define DRIVER_NAME     (isp1301_driver.driver.name)
 48 
 49 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
 50 MODULE_LICENSE("GPL");
 51 
 52 struct isp1301 {
 53         struct usb_phy          phy;
 54         struct i2c_client       *client;
 55         void                    (*i2c_release)(struct device *dev);
 56 
 57         int                     irq_type;
 58 
 59         u32                     last_otg_ctrl;
 60         unsigned                working:1;
 61 
 62         struct timer_list       timer;
 63 
 64         /* use keventd context to change the state for us */
 65         struct work_struct      work;
 66 
 67         unsigned long           todo;
 68 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
 69 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
 70 #               define WORK_HOST_RESUME 4       /* resume host */
 71 #               define WORK_TIMER       6       /* timer fired */
 72 #               define WORK_STOP        7       /* don't resubmit */
 73 };
 74 
 75 
 76 /* bits in OTG_CTRL */
 77 
 78 #define OTG_XCEIV_OUTPUTS \
 79         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
 80 #define OTG_XCEIV_INPUTS \
 81         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
 82 #define OTG_CTRL_BITS \
 83         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
 84         /* and OTG_PULLUP is sometimes written */
 85 
 86 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
 87         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
 88         OTG_CTRL_BITS)
 89 
 90 
 91 /*-------------------------------------------------------------------------*/
 92 
 93 /* board-specific PM hooks */
 94 
 95 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
 96 
 97 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
 98 
 99 #include <linux/i2c/tps65010.h>
100 
101 #else
102 
103 static inline int tps65010_set_vbus_draw(unsigned mA)
104 {
105         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
106         return 0;
107 }
108 
109 #endif
110 
111 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
112 {
113         int status = tps65010_set_vbus_draw(mA);
114         if (status < 0)
115                 pr_debug("  VBUS %d mA error %d\n", mA, status);
116 }
117 
118 #else
119 
120 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
121 {
122         /* H4 controls this by DIP switch S2.4; no soft control.
123          * ON means the charger is always enabled.  Leave it OFF
124          * unless the OTG port is used only in B-peripheral mode.
125          */
126 }
127 
128 #endif
129 
130 static void enable_vbus_source(struct isp1301 *isp)
131 {
132         /* this board won't supply more than 8mA vbus power.
133          * some boards can switch a 100ma "unit load" (or more).
134          */
135 }
136 
137 
138 /* products will deliver OTG messages with LEDs, GUI, etc */
139 static inline void notresponding(struct isp1301 *isp)
140 {
141         printk(KERN_NOTICE "OTG device not responding.\n");
142 }
143 
144 
145 /*-------------------------------------------------------------------------*/
146 
147 static struct i2c_driver isp1301_driver;
148 
149 /* smbus apis are used for portability */
150 
151 static inline u8
152 isp1301_get_u8(struct isp1301 *isp, u8 reg)
153 {
154         return i2c_smbus_read_byte_data(isp->client, reg + 0);
155 }
156 
157 static inline int
158 isp1301_get_u16(struct isp1301 *isp, u8 reg)
159 {
160         return i2c_smbus_read_word_data(isp->client, reg);
161 }
162 
163 static inline int
164 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
165 {
166         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
167 }
168 
169 static inline int
170 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
171 {
172         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
173 }
174 
175 /*-------------------------------------------------------------------------*/
176 
177 /* identification */
178 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
179 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
180 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
181 
182 #define I2C_VENDOR_ID_PHILIPS           0x04cc
183 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
184 
185 /* operational registers */
186 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
187 #       define  MC1_SPEED               (1 << 0)
188 #       define  MC1_SUSPEND             (1 << 1)
189 #       define  MC1_DAT_SE0             (1 << 2)
190 #       define  MC1_TRANSPARENT         (1 << 3)
191 #       define  MC1_BDIS_ACON_EN        (1 << 4)
192 #       define  MC1_OE_INT_EN           (1 << 5)
193 #       define  MC1_UART_EN             (1 << 6)
194 #       define  MC1_MASK                0x7f
195 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
196 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
197 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
198 #       define  MC2_BI_DI               (1 << 2)
199 #       define  MC2_TRANSP_BDIR0        (1 << 3)
200 #       define  MC2_TRANSP_BDIR1        (1 << 4)
201 #       define  MC2_AUDIO_EN            (1 << 5)
202 #       define  MC2_PSW_EN              (1 << 6)
203 #       define  MC2_EN2V7               (1 << 7)
204 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
205 #       define  OTG1_DP_PULLUP          (1 << 0)
206 #       define  OTG1_DM_PULLUP          (1 << 1)
207 #       define  OTG1_DP_PULLDOWN        (1 << 2)
208 #       define  OTG1_DM_PULLDOWN        (1 << 3)
209 #       define  OTG1_ID_PULLDOWN        (1 << 4)
210 #       define  OTG1_VBUS_DRV           (1 << 5)
211 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
212 #       define  OTG1_VBUS_CHRG          (1 << 7)
213 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
214 #       define  OTG_B_SESS_END          (1 << 6)
215 #       define  OTG_B_SESS_VLD          (1 << 7)
216 
217 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
218 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
219 
220 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
221 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
222 
223 /* same bitfields in all interrupt registers */
224 #       define  INTR_VBUS_VLD           (1 << 0)
225 #       define  INTR_SESS_VLD           (1 << 1)
226 #       define  INTR_DP_HI              (1 << 2)
227 #       define  INTR_ID_GND             (1 << 3)
228 #       define  INTR_DM_HI              (1 << 4)
229 #       define  INTR_ID_FLOAT           (1 << 5)
230 #       define  INTR_BDIS_ACON          (1 << 6)
231 #       define  INTR_CR_INT             (1 << 7)
232 
233 /*-------------------------------------------------------------------------*/
234 
235 static inline const char *state_name(struct isp1301 *isp)
236 {
237         return usb_otg_state_string(isp->phy.state);
238 }
239 
240 /*-------------------------------------------------------------------------*/
241 
242 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
243  * not everything is guarded by board-specific checks, or even using
244  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
245  *
246  * ALSO:  this currently doesn't use ISP1301 low-power modes
247  * while OTG is running.
248  */
249 
250 static void power_down(struct isp1301 *isp)
251 {
252         isp->phy.state = OTG_STATE_UNDEFINED;
253 
254         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
255         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
256 
257         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
258         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
259 }
260 
261 static void power_up(struct isp1301 *isp)
262 {
263         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
264         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
265 
266         /* do this only when cpu is driving transceiver,
267          * so host won't see a low speed device...
268          */
269         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
270 }
271 
272 #define NO_HOST_SUSPEND
273 
274 static int host_suspend(struct isp1301 *isp)
275 {
276 #ifdef  NO_HOST_SUSPEND
277         return 0;
278 #else
279         struct device   *dev;
280 
281         if (!isp->phy.otg->host)
282                 return -ENODEV;
283 
284         /* Currently ASSUMES only the OTG port matters;
285          * other ports could be active...
286          */
287         dev = isp->phy.otg->host->controller;
288         return dev->driver->suspend(dev, 3, 0);
289 #endif
290 }
291 
292 static int host_resume(struct isp1301 *isp)
293 {
294 #ifdef  NO_HOST_SUSPEND
295         return 0;
296 #else
297         struct device   *dev;
298 
299         if (!isp->phy.otg->host)
300                 return -ENODEV;
301 
302         dev = isp->phy.otg->host->controller;
303         return dev->driver->resume(dev, 0);
304 #endif
305 }
306 
307 static int gadget_suspend(struct isp1301 *isp)
308 {
309         isp->phy.otg->gadget->b_hnp_enable = 0;
310         isp->phy.otg->gadget->a_hnp_support = 0;
311         isp->phy.otg->gadget->a_alt_hnp_support = 0;
312         return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
313 }
314 
315 /*-------------------------------------------------------------------------*/
316 
317 #define TIMER_MINUTES   10
318 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
319 
320 /* Almost all our I2C messaging comes from a work queue's task context.
321  * NOTE: guaranteeing certain response times might mean we shouldn't
322  * share keventd's work queue; a realtime task might be safest.
323  */
324 static void isp1301_defer_work(struct isp1301 *isp, int work)
325 {
326         int status;
327 
328         if (isp && !test_and_set_bit(work, &isp->todo)) {
329                 (void) get_device(&isp->client->dev);
330                 status = schedule_work(&isp->work);
331                 if (!status && !isp->working)
332                         dev_vdbg(&isp->client->dev,
333                                 "work item %d may be lost\n", work);
334         }
335 }
336 
337 /* called from irq handlers */
338 static void a_idle(struct isp1301 *isp, const char *tag)
339 {
340         u32 l;
341 
342         if (isp->phy.state == OTG_STATE_A_IDLE)
343                 return;
344 
345         isp->phy.otg->default_a = 1;
346         if (isp->phy.otg->host) {
347                 isp->phy.otg->host->is_b_host = 0;
348                 host_suspend(isp);
349         }
350         if (isp->phy.otg->gadget) {
351                 isp->phy.otg->gadget->is_a_peripheral = 1;
352                 gadget_suspend(isp);
353         }
354         isp->phy.state = OTG_STATE_A_IDLE;
355         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
356         omap_writel(l, OTG_CTRL);
357         isp->last_otg_ctrl = l;
358         pr_debug("  --> %s/%s\n", state_name(isp), tag);
359 }
360 
361 /* called from irq handlers */
362 static void b_idle(struct isp1301 *isp, const char *tag)
363 {
364         u32 l;
365 
366         if (isp->phy.state == OTG_STATE_B_IDLE)
367                 return;
368 
369         isp->phy.otg->default_a = 0;
370         if (isp->phy.otg->host) {
371                 isp->phy.otg->host->is_b_host = 1;
372                 host_suspend(isp);
373         }
374         if (isp->phy.otg->gadget) {
375                 isp->phy.otg->gadget->is_a_peripheral = 0;
376                 gadget_suspend(isp);
377         }
378         isp->phy.state = OTG_STATE_B_IDLE;
379         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
380         omap_writel(l, OTG_CTRL);
381         isp->last_otg_ctrl = l;
382         pr_debug("  --> %s/%s\n", state_name(isp), tag);
383 }
384 
385 static void
386 dump_regs(struct isp1301 *isp, const char *label)
387 {
388         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
389         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
390         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
391 
392         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
393                 omap_readl(OTG_CTRL), label, state_name(isp),
394                 ctrl, status, src);
395         /* mode control and irq enables don't change much */
396 }
397 
398 /*-------------------------------------------------------------------------*/
399 
400 #ifdef  CONFIG_USB_OTG
401 
402 /*
403  * The OMAP OTG controller handles most of the OTG state transitions.
404  *
405  * We translate isp1301 outputs (mostly voltage comparator status) into
406  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
407  * flags into isp1301 inputs ... and infer state transitions.
408  */
409 
410 #ifdef  VERBOSE
411 
412 static void check_state(struct isp1301 *isp, const char *tag)
413 {
414         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
415         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
416         unsigned                extra = 0;
417 
418         switch (fsm) {
419 
420         /* default-b */
421         case 0x0:
422                 state = OTG_STATE_B_IDLE;
423                 break;
424         case 0x3:
425         case 0x7:
426                 extra = 1;
427         case 0x1:
428                 state = OTG_STATE_B_PERIPHERAL;
429                 break;
430         case 0x11:
431                 state = OTG_STATE_B_SRP_INIT;
432                 break;
433 
434         /* extra dual-role default-b states */
435         case 0x12:
436         case 0x13:
437         case 0x16:
438                 extra = 1;
439         case 0x17:
440                 state = OTG_STATE_B_WAIT_ACON;
441                 break;
442         case 0x34:
443                 state = OTG_STATE_B_HOST;
444                 break;
445 
446         /* default-a */
447         case 0x36:
448                 state = OTG_STATE_A_IDLE;
449                 break;
450         case 0x3c:
451                 state = OTG_STATE_A_WAIT_VFALL;
452                 break;
453         case 0x7d:
454                 state = OTG_STATE_A_VBUS_ERR;
455                 break;
456         case 0x9e:
457         case 0x9f:
458                 extra = 1;
459         case 0x89:
460                 state = OTG_STATE_A_PERIPHERAL;
461                 break;
462         case 0xb7:
463                 state = OTG_STATE_A_WAIT_VRISE;
464                 break;
465         case 0xb8:
466                 state = OTG_STATE_A_WAIT_BCON;
467                 break;
468         case 0xb9:
469                 state = OTG_STATE_A_HOST;
470                 break;
471         case 0xba:
472                 state = OTG_STATE_A_SUSPEND;
473                 break;
474         default:
475                 break;
476         }
477         if (isp->phy.state == state && !extra)
478                 return;
479         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
480                 usb_otg_state_string(state), fsm, state_name(isp),
481                 omap_readl(OTG_CTRL));
482 }
483 
484 #else
485 
486 static inline void check_state(struct isp1301 *isp, const char *tag) { }
487 
488 #endif
489 
490 /* outputs from ISP1301_INTERRUPT_SOURCE */
491 static void update_otg1(struct isp1301 *isp, u8 int_src)
492 {
493         u32     otg_ctrl;
494 
495         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
496         otg_ctrl &= ~OTG_XCEIV_INPUTS;
497         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
498 
499         if (int_src & INTR_SESS_VLD)
500                 otg_ctrl |= OTG_ASESSVLD;
501         else if (isp->phy.state == OTG_STATE_A_WAIT_VFALL) {
502                 a_idle(isp, "vfall");
503                 otg_ctrl &= ~OTG_CTRL_BITS;
504         }
505         if (int_src & INTR_VBUS_VLD)
506                 otg_ctrl |= OTG_VBUSVLD;
507         if (int_src & INTR_ID_GND) {            /* default-A */
508                 if (isp->phy.state == OTG_STATE_B_IDLE
509                                 || isp->phy.state
510                                         == OTG_STATE_UNDEFINED) {
511                         a_idle(isp, "init");
512                         return;
513                 }
514         } else {                                /* default-B */
515                 otg_ctrl |= OTG_ID;
516                 if (isp->phy.state == OTG_STATE_A_IDLE
517                         || isp->phy.state == OTG_STATE_UNDEFINED) {
518                         b_idle(isp, "init");
519                         return;
520                 }
521         }
522         omap_writel(otg_ctrl, OTG_CTRL);
523 }
524 
525 /* outputs from ISP1301_OTG_STATUS */
526 static void update_otg2(struct isp1301 *isp, u8 otg_status)
527 {
528         u32     otg_ctrl;
529 
530         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
531         otg_ctrl &= ~OTG_XCEIV_INPUTS;
532         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
533         if (otg_status & OTG_B_SESS_VLD)
534                 otg_ctrl |= OTG_BSESSVLD;
535         else if (otg_status & OTG_B_SESS_END)
536                 otg_ctrl |= OTG_BSESSEND;
537         omap_writel(otg_ctrl, OTG_CTRL);
538 }
539 
540 /* inputs going to ISP1301 */
541 static void otg_update_isp(struct isp1301 *isp)
542 {
543         u32     otg_ctrl, otg_change;
544         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
545 
546         otg_ctrl = omap_readl(OTG_CTRL);
547         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
548         isp->last_otg_ctrl = otg_ctrl;
549         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
550 
551         switch (isp->phy.state) {
552         case OTG_STATE_B_IDLE:
553         case OTG_STATE_B_PERIPHERAL:
554         case OTG_STATE_B_SRP_INIT:
555                 if (!(otg_ctrl & OTG_PULLUP)) {
556                         // if (otg_ctrl & OTG_B_HNPEN) {
557                         if (isp->phy.otg->gadget->b_hnp_enable) {
558                                 isp->phy.state = OTG_STATE_B_WAIT_ACON;
559                                 pr_debug("  --> b_wait_acon\n");
560                         }
561                         goto pulldown;
562                 }
563 pullup:
564                 set |= OTG1_DP_PULLUP;
565                 clr |= OTG1_DP_PULLDOWN;
566                 break;
567         case OTG_STATE_A_SUSPEND:
568         case OTG_STATE_A_PERIPHERAL:
569                 if (otg_ctrl & OTG_PULLUP)
570                         goto pullup;
571                 /* FALLTHROUGH */
572         // case OTG_STATE_B_WAIT_ACON:
573         default:
574 pulldown:
575                 set |= OTG1_DP_PULLDOWN;
576                 clr |= OTG1_DP_PULLUP;
577                 break;
578         }
579 
580 #       define toggle(OTG,ISP) do { \
581                 if (otg_ctrl & OTG) set |= ISP; \
582                 else clr |= ISP; \
583                 } while (0)
584 
585         if (!(isp->phy.otg->host))
586                 otg_ctrl &= ~OTG_DRV_VBUS;
587 
588         switch (isp->phy.state) {
589         case OTG_STATE_A_SUSPEND:
590                 if (otg_ctrl & OTG_DRV_VBUS) {
591                         set |= OTG1_VBUS_DRV;
592                         break;
593                 }
594                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
595                 notresponding(isp);
596 
597                 /* FALLTHROUGH */
598         case OTG_STATE_A_VBUS_ERR:
599                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
600                 pr_debug("  --> a_wait_vfall\n");
601                 /* FALLTHROUGH */
602         case OTG_STATE_A_WAIT_VFALL:
603                 /* FIXME usbcore thinks port power is still on ... */
604                 clr |= OTG1_VBUS_DRV;
605                 break;
606         case OTG_STATE_A_IDLE:
607                 if (otg_ctrl & OTG_DRV_VBUS) {
608                         isp->phy.state = OTG_STATE_A_WAIT_VRISE;
609                         pr_debug("  --> a_wait_vrise\n");
610                 }
611                 /* FALLTHROUGH */
612         default:
613                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
614         }
615 
616         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
617         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
618 
619 #       undef toggle
620 
621         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
622         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
623 
624         /* HNP switch to host or peripheral; and SRP */
625         if (otg_change & OTG_PULLUP) {
626                 u32 l;
627 
628                 switch (isp->phy.state) {
629                 case OTG_STATE_B_IDLE:
630                         if (clr & OTG1_DP_PULLUP)
631                                 break;
632                         isp->phy.state = OTG_STATE_B_PERIPHERAL;
633                         pr_debug("  --> b_peripheral\n");
634                         break;
635                 case OTG_STATE_A_SUSPEND:
636                         if (clr & OTG1_DP_PULLUP)
637                                 break;
638                         isp->phy.state = OTG_STATE_A_PERIPHERAL;
639                         pr_debug("  --> a_peripheral\n");
640                         break;
641                 default:
642                         break;
643                 }
644                 l = omap_readl(OTG_CTRL);
645                 l |= OTG_PULLUP;
646                 omap_writel(l, OTG_CTRL);
647         }
648 
649         check_state(isp, __func__);
650         dump_regs(isp, "otg->isp1301");
651 }
652 
653 static irqreturn_t omap_otg_irq(int irq, void *_isp)
654 {
655         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
656         u32             otg_ctrl;
657         int             ret = IRQ_NONE;
658         struct isp1301  *isp = _isp;
659         struct usb_otg  *otg = isp->phy.otg;
660 
661         /* update ISP1301 transceiver from OTG controller */
662         if (otg_irq & OPRT_CHG) {
663                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
664                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
665                 ret = IRQ_HANDLED;
666 
667         /* SRP to become b_peripheral failed */
668         } else if (otg_irq & B_SRP_TMROUT) {
669                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
670                 notresponding(isp);
671 
672                 /* gadget drivers that care should monitor all kinds of
673                  * remote wakeup (SRP, normal) using their own timer
674                  * to give "check cable and A-device" messages.
675                  */
676                 if (isp->phy.state == OTG_STATE_B_SRP_INIT)
677                         b_idle(isp, "srp_timeout");
678 
679                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
680                 ret = IRQ_HANDLED;
681 
682         /* HNP to become b_host failed */
683         } else if (otg_irq & B_HNP_FAIL) {
684                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
685                                 state_name(isp), omap_readl(OTG_CTRL));
686                 notresponding(isp);
687 
688                 otg_ctrl = omap_readl(OTG_CTRL);
689                 otg_ctrl |= OTG_BUSDROP;
690                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
691                 omap_writel(otg_ctrl, OTG_CTRL);
692 
693                 /* subset of b_peripheral()... */
694                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
695                 pr_debug("  --> b_peripheral\n");
696 
697                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
698                 ret = IRQ_HANDLED;
699 
700         /* detect SRP from B-device ... */
701         } else if (otg_irq & A_SRP_DETECT) {
702                 pr_debug("otg: %s SRP_DETECT, %06x\n",
703                                 state_name(isp), omap_readl(OTG_CTRL));
704 
705                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
706                 switch (isp->phy.state) {
707                 case OTG_STATE_A_IDLE:
708                         if (!otg->host)
709                                 break;
710                         isp1301_defer_work(isp, WORK_HOST_RESUME);
711                         otg_ctrl = omap_readl(OTG_CTRL);
712                         otg_ctrl |= OTG_A_BUSREQ;
713                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
714                                         & ~OTG_XCEIV_INPUTS
715                                         & OTG_CTRL_MASK;
716                         omap_writel(otg_ctrl, OTG_CTRL);
717                         break;
718                 default:
719                         break;
720                 }
721 
722                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
723                 ret = IRQ_HANDLED;
724 
725         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
726          * we don't track them separately
727          */
728         } else if (otg_irq & A_REQ_TMROUT) {
729                 otg_ctrl = omap_readl(OTG_CTRL);
730                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
731                                 state_name(isp), otg_ctrl);
732                 notresponding(isp);
733 
734                 otg_ctrl |= OTG_BUSDROP;
735                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
736                 omap_writel(otg_ctrl, OTG_CTRL);
737                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
738 
739                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
740                 ret = IRQ_HANDLED;
741 
742         /* A-supplied voltage fell too low; overcurrent */
743         } else if (otg_irq & A_VBUS_ERR) {
744                 otg_ctrl = omap_readl(OTG_CTRL);
745                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
746                         state_name(isp), otg_irq, otg_ctrl);
747 
748                 otg_ctrl |= OTG_BUSDROP;
749                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
750                 omap_writel(otg_ctrl, OTG_CTRL);
751                 isp->phy.state = OTG_STATE_A_VBUS_ERR;
752 
753                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
754                 ret = IRQ_HANDLED;
755 
756         /* switch driver; the transceiver code activates it,
757          * ungating the udc clock or resuming OHCI.
758          */
759         } else if (otg_irq & DRIVER_SWITCH) {
760                 int     kick = 0;
761 
762                 otg_ctrl = omap_readl(OTG_CTRL);
763                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
764                                 state_name(isp),
765                                 (otg_ctrl & OTG_DRIVER_SEL)
766                                         ? "gadget" : "host",
767                                 otg_ctrl);
768                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
769 
770                 /* role is peripheral */
771                 if (otg_ctrl & OTG_DRIVER_SEL) {
772                         switch (isp->phy.state) {
773                         case OTG_STATE_A_IDLE:
774                                 b_idle(isp, __func__);
775                                 break;
776                         default:
777                                 break;
778                         }
779                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
780 
781                 /* role is host */
782                 } else {
783                         if (!(otg_ctrl & OTG_ID)) {
784                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
785                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
786                         }
787 
788                         if (otg->host) {
789                                 switch (isp->phy.state) {
790                                 case OTG_STATE_B_WAIT_ACON:
791                                         isp->phy.state = OTG_STATE_B_HOST;
792                                         pr_debug("  --> b_host\n");
793                                         kick = 1;
794                                         break;
795                                 case OTG_STATE_A_WAIT_BCON:
796                                         isp->phy.state = OTG_STATE_A_HOST;
797                                         pr_debug("  --> a_host\n");
798                                         break;
799                                 case OTG_STATE_A_PERIPHERAL:
800                                         isp->phy.state = OTG_STATE_A_WAIT_BCON;
801                                         pr_debug("  --> a_wait_bcon\n");
802                                         break;
803                                 default:
804                                         break;
805                                 }
806                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
807                         }
808                 }
809 
810                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
811                 ret = IRQ_HANDLED;
812 
813                 if (kick)
814                         usb_bus_start_enum(otg->host, otg->host->otg_port);
815         }
816 
817         check_state(isp, __func__);
818         return ret;
819 }
820 
821 static struct platform_device *otg_dev;
822 
823 static int isp1301_otg_init(struct isp1301 *isp)
824 {
825         u32 l;
826 
827         if (!otg_dev)
828                 return -ENODEV;
829 
830         dump_regs(isp, __func__);
831         /* some of these values are board-specific... */
832         l = omap_readl(OTG_SYSCON_2);
833         l |= OTG_EN
834                 /* for B-device: */
835                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
836                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
837                 // | (3 << 24)          /* 2msec VBUS pulse */
838                 /* for A-device: */
839                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
840                 | SRP_DPW               /* detect 167+ns SRP pulses */
841                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
842                 ;
843         omap_writel(l, OTG_SYSCON_2);
844 
845         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
846         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
847 
848         check_state(isp, __func__);
849         pr_debug("otg: %s, %s %06x\n",
850                         state_name(isp), __func__, omap_readl(OTG_CTRL));
851 
852         omap_writew(DRIVER_SWITCH | OPRT_CHG
853                         | B_SRP_TMROUT | B_HNP_FAIL
854                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
855 
856         l = omap_readl(OTG_SYSCON_2);
857         l |= OTG_EN;
858         omap_writel(l, OTG_SYSCON_2);
859 
860         return 0;
861 }
862 
863 static int otg_probe(struct platform_device *dev)
864 {
865         // struct omap_usb_config *config = dev->platform_data;
866 
867         otg_dev = dev;
868         return 0;
869 }
870 
871 static int otg_remove(struct platform_device *dev)
872 {
873         otg_dev = NULL;
874         return 0;
875 }
876 
877 static struct platform_driver omap_otg_driver = {
878         .probe          = otg_probe,
879         .remove         = otg_remove,
880         .driver         = {
881                 .owner  = THIS_MODULE,
882                 .name   = "omap_otg",
883         },
884 };
885 
886 static int otg_bind(struct isp1301 *isp)
887 {
888         int     status;
889 
890         if (otg_dev)
891                 return -EBUSY;
892 
893         status = platform_driver_register(&omap_otg_driver);
894         if (status < 0)
895                 return status;
896 
897         if (otg_dev)
898                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
899                                 0, DRIVER_NAME, isp);
900         else
901                 status = -ENODEV;
902 
903         if (status < 0)
904                 platform_driver_unregister(&omap_otg_driver);
905         return status;
906 }
907 
908 static void otg_unbind(struct isp1301 *isp)
909 {
910         if (!otg_dev)
911                 return;
912         free_irq(otg_dev->resource[1].start, isp);
913 }
914 
915 #else
916 
917 /* OTG controller isn't clocked */
918 
919 #endif  /* CONFIG_USB_OTG */
920 
921 /*-------------------------------------------------------------------------*/
922 
923 static void b_peripheral(struct isp1301 *isp)
924 {
925         u32 l;
926 
927         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
928         omap_writel(l, OTG_CTRL);
929 
930         usb_gadget_vbus_connect(isp->phy.otg->gadget);
931 
932 #ifdef  CONFIG_USB_OTG
933         enable_vbus_draw(isp, 8);
934         otg_update_isp(isp);
935 #else
936         enable_vbus_draw(isp, 100);
937         /* UDC driver just set OTG_BSESSVLD */
938         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
939         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
940         isp->phy.state = OTG_STATE_B_PERIPHERAL;
941         pr_debug("  --> b_peripheral\n");
942         dump_regs(isp, "2periph");
943 #endif
944 }
945 
946 static void isp_update_otg(struct isp1301 *isp, u8 stat)
947 {
948         struct usb_otg          *otg = isp->phy.otg;
949         u8                      isp_stat, isp_bstat;
950         enum usb_otg_state      state = isp->phy.state;
951 
952         if (stat & INTR_BDIS_ACON)
953                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
954 
955         /* start certain state transitions right away */
956         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
957         if (isp_stat & INTR_ID_GND) {
958                 if (otg->default_a) {
959                         switch (state) {
960                         case OTG_STATE_B_IDLE:
961                                 a_idle(isp, "idle");
962                                 /* FALLTHROUGH */
963                         case OTG_STATE_A_IDLE:
964                                 enable_vbus_source(isp);
965                                 /* FALLTHROUGH */
966                         case OTG_STATE_A_WAIT_VRISE:
967                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
968                                  * the HC will transition to A_HOST (or
969                                  * A_SUSPEND!) without our noticing except
970                                  * when HNP is used.
971                                  */
972                                 if (isp_stat & INTR_VBUS_VLD)
973                                         isp->phy.state = OTG_STATE_A_HOST;
974                                 break;
975                         case OTG_STATE_A_WAIT_VFALL:
976                                 if (!(isp_stat & INTR_SESS_VLD))
977                                         a_idle(isp, "vfell");
978                                 break;
979                         default:
980                                 if (!(isp_stat & INTR_VBUS_VLD))
981                                         isp->phy.state = OTG_STATE_A_VBUS_ERR;
982                                 break;
983                         }
984                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
985                 } else {
986                         switch (state) {
987                         case OTG_STATE_B_PERIPHERAL:
988                         case OTG_STATE_B_HOST:
989                         case OTG_STATE_B_WAIT_ACON:
990                                 usb_gadget_vbus_disconnect(otg->gadget);
991                                 break;
992                         default:
993                                 break;
994                         }
995                         if (state != OTG_STATE_A_IDLE)
996                                 a_idle(isp, "id");
997                         if (otg->host && state == OTG_STATE_A_IDLE)
998                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
999                         isp_bstat = 0;
1000                 }
1001         } else {
1002                 u32 l;
1003 
1004                 /* if user unplugged mini-A end of cable,
1005                  * don't bypass A_WAIT_VFALL.
1006                  */
1007                 if (otg->default_a) {
1008                         switch (state) {
1009                         default:
1010                                 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
1011                                 break;
1012                         case OTG_STATE_A_WAIT_VFALL:
1013                                 state = OTG_STATE_A_IDLE;
1014                                 /* khubd may take a while to notice and
1015                                  * handle this disconnect, so don't go
1016                                  * to B_IDLE quite yet.
1017                                  */
1018                                 break;
1019                         case OTG_STATE_A_IDLE:
1020                                 host_suspend(isp);
1021                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1022                                                 MC1_BDIS_ACON_EN);
1023                                 isp->phy.state = OTG_STATE_B_IDLE;
1024                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1025                                 l &= ~OTG_CTRL_BITS;
1026                                 omap_writel(l, OTG_CTRL);
1027                                 break;
1028                         case OTG_STATE_B_IDLE:
1029                                 break;
1030                         }
1031                 }
1032                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1033 
1034                 switch (isp->phy.state) {
1035                 case OTG_STATE_B_PERIPHERAL:
1036                 case OTG_STATE_B_WAIT_ACON:
1037                 case OTG_STATE_B_HOST:
1038                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1039                                 break;
1040                         enable_vbus_draw(isp, 0);
1041 #ifndef CONFIG_USB_OTG
1042                         /* UDC driver will clear OTG_BSESSVLD */
1043                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1044                                                 OTG1_DP_PULLDOWN);
1045                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1046                                                 OTG1_DP_PULLUP);
1047                         dump_regs(isp, __func__);
1048 #endif
1049                         /* FALLTHROUGH */
1050                 case OTG_STATE_B_SRP_INIT:
1051                         b_idle(isp, __func__);
1052                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1053                         omap_writel(l, OTG_CTRL);
1054                         /* FALLTHROUGH */
1055                 case OTG_STATE_B_IDLE:
1056                         if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1057 #ifdef  CONFIG_USB_OTG
1058                                 update_otg1(isp, isp_stat);
1059                                 update_otg2(isp, isp_bstat);
1060 #endif
1061                                 b_peripheral(isp);
1062                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1063                                 isp_bstat |= OTG_B_SESS_END;
1064                         break;
1065                 case OTG_STATE_A_WAIT_VFALL:
1066                         break;
1067                 default:
1068                         pr_debug("otg: unsupported b-device %s\n",
1069                                 state_name(isp));
1070                         break;
1071                 }
1072         }
1073 
1074         if (state != isp->phy.state)
1075                 pr_debug("  isp, %s -> %s\n",
1076                                 usb_otg_state_string(state), state_name(isp));
1077 
1078 #ifdef  CONFIG_USB_OTG
1079         /* update the OTG controller state to match the isp1301; may
1080          * trigger OPRT_CHG irqs for changes going to the isp1301.
1081          */
1082         update_otg1(isp, isp_stat);
1083         update_otg2(isp, isp_bstat);
1084         check_state(isp, __func__);
1085 #endif
1086 
1087         dump_regs(isp, "isp1301->otg");
1088 }
1089 
1090 /*-------------------------------------------------------------------------*/
1091 
1092 static u8 isp1301_clear_latch(struct isp1301 *isp)
1093 {
1094         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1095         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1096         return latch;
1097 }
1098 
1099 static void
1100 isp1301_work(struct work_struct *work)
1101 {
1102         struct isp1301  *isp = container_of(work, struct isp1301, work);
1103         int             stop;
1104 
1105         /* implicit lock:  we're the only task using this device */
1106         isp->working = 1;
1107         do {
1108                 stop = test_bit(WORK_STOP, &isp->todo);
1109 
1110 #ifdef  CONFIG_USB_OTG
1111                 /* transfer state from otg engine to isp1301 */
1112                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1113                         otg_update_isp(isp);
1114                         put_device(&isp->client->dev);
1115                 }
1116 #endif
1117                 /* transfer state from isp1301 to otg engine */
1118                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1119                         u8              stat = isp1301_clear_latch(isp);
1120 
1121                         isp_update_otg(isp, stat);
1122                         put_device(&isp->client->dev);
1123                 }
1124 
1125                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1126                         u32     otg_ctrl;
1127 
1128                         /*
1129                          * skip A_WAIT_VRISE; hc transitions invisibly
1130                          * skip A_WAIT_BCON; same.
1131                          */
1132                         switch (isp->phy.state) {
1133                         case OTG_STATE_A_WAIT_BCON:
1134                         case OTG_STATE_A_WAIT_VRISE:
1135                                 isp->phy.state = OTG_STATE_A_HOST;
1136                                 pr_debug("  --> a_host\n");
1137                                 otg_ctrl = omap_readl(OTG_CTRL);
1138                                 otg_ctrl |= OTG_A_BUSREQ;
1139                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1140                                                 & OTG_CTRL_MASK;
1141                                 omap_writel(otg_ctrl, OTG_CTRL);
1142                                 break;
1143                         case OTG_STATE_B_WAIT_ACON:
1144                                 isp->phy.state = OTG_STATE_B_HOST;
1145                                 pr_debug("  --> b_host (acon)\n");
1146                                 break;
1147                         case OTG_STATE_B_HOST:
1148                         case OTG_STATE_B_IDLE:
1149                         case OTG_STATE_A_IDLE:
1150                                 break;
1151                         default:
1152                                 pr_debug("  host resume in %s\n",
1153                                                 state_name(isp));
1154                         }
1155                         host_resume(isp);
1156                         // mdelay(10);
1157                         put_device(&isp->client->dev);
1158                 }
1159 
1160                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1161 #ifdef  VERBOSE
1162                         dump_regs(isp, "timer");
1163                         if (!stop)
1164                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1165 #endif
1166                         put_device(&isp->client->dev);
1167                 }
1168 
1169                 if (isp->todo)
1170                         dev_vdbg(&isp->client->dev,
1171                                 "work done, todo = 0x%lx\n",
1172                                 isp->todo);
1173                 if (stop) {
1174                         dev_dbg(&isp->client->dev, "stop\n");
1175                         break;
1176                 }
1177         } while (isp->todo);
1178         isp->working = 0;
1179 }
1180 
1181 static irqreturn_t isp1301_irq(int irq, void *isp)
1182 {
1183         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1184         return IRQ_HANDLED;
1185 }
1186 
1187 static void isp1301_timer(unsigned long _isp)
1188 {
1189         isp1301_defer_work((void *)_isp, WORK_TIMER);
1190 }
1191 
1192 /*-------------------------------------------------------------------------*/
1193 
1194 static void isp1301_release(struct device *dev)
1195 {
1196         struct isp1301  *isp;
1197 
1198         isp = dev_get_drvdata(dev);
1199 
1200         /* FIXME -- not with a "new style" driver, it doesn't!! */
1201 
1202         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1203         if (isp->i2c_release)
1204                 isp->i2c_release(dev);
1205         kfree(isp->phy.otg);
1206         kfree (isp);
1207 }
1208 
1209 static struct isp1301 *the_transceiver;
1210 
1211 static int isp1301_remove(struct i2c_client *i2c)
1212 {
1213         struct isp1301  *isp;
1214 
1215         isp = i2c_get_clientdata(i2c);
1216 
1217         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1218         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1219         free_irq(i2c->irq, isp);
1220 #ifdef  CONFIG_USB_OTG
1221         otg_unbind(isp);
1222 #endif
1223         if (machine_is_omap_h2())
1224                 gpio_free(2);
1225 
1226         isp->timer.data = 0;
1227         set_bit(WORK_STOP, &isp->todo);
1228         del_timer_sync(&isp->timer);
1229         flush_work(&isp->work);
1230 
1231         put_device(&i2c->dev);
1232         the_transceiver = NULL;
1233 
1234         return 0;
1235 }
1236 
1237 /*-------------------------------------------------------------------------*/
1238 
1239 /* NOTE:  three modes are possible here, only one of which
1240  * will be standards-conformant on any given system:
1241  *
1242  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1243  *  - HOST mode, for when there's one or more A (host) connectors
1244  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1245  *
1246  * As a rule, you won't have an isp1301 chip unless it's there to
1247  * support the OTG mode.  Other modes help testing USB controllers
1248  * in isolation from (full) OTG support, or maybe so later board
1249  * revisions can help to support those feature.
1250  */
1251 
1252 #ifdef  CONFIG_USB_OTG
1253 
1254 static int isp1301_otg_enable(struct isp1301 *isp)
1255 {
1256         power_up(isp);
1257         isp1301_otg_init(isp);
1258 
1259         /* NOTE:  since we don't change this, this provides
1260          * a few more interrupts than are strictly needed.
1261          */
1262         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1263                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1264         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1265                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1266 
1267         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1268 
1269         return 0;
1270 }
1271 
1272 #endif
1273 
1274 /* add or disable the host device+driver */
1275 static int
1276 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1277 {
1278         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1279 
1280         if (isp != the_transceiver)
1281                 return -ENODEV;
1282 
1283         if (!host) {
1284                 omap_writew(0, OTG_IRQ_EN);
1285                 power_down(isp);
1286                 otg->host = NULL;
1287                 return 0;
1288         }
1289 
1290 #ifdef  CONFIG_USB_OTG
1291         otg->host = host;
1292         dev_dbg(&isp->client->dev, "registered host\n");
1293         host_suspend(isp);
1294         if (otg->gadget)
1295                 return isp1301_otg_enable(isp);
1296         return 0;
1297 
1298 #elif !IS_ENABLED(CONFIG_USB_OMAP)
1299         // FIXME update its refcount
1300         otg->host = host;
1301 
1302         power_up(isp);
1303 
1304         if (machine_is_omap_h2())
1305                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1306 
1307         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1308         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1309                 INTR_ID_GND);
1310         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1311                 INTR_ID_GND);
1312 
1313         /* If this has a Mini-AB connector, this mode is highly
1314          * nonstandard ... but can be handy for testing, especially with
1315          * the Mini-A end of an OTG cable.  (Or something nonstandard
1316          * like MiniB-to-StandardB, maybe built with a gender mender.)
1317          */
1318         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1319 
1320         dump_regs(isp, __func__);
1321 
1322         return 0;
1323 
1324 #else
1325         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1326         return -EINVAL;
1327 #endif
1328 
1329 }
1330 
1331 static int
1332 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1333 {
1334         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1335 
1336         if (isp != the_transceiver)
1337                 return -ENODEV;
1338 
1339         if (!gadget) {
1340                 omap_writew(0, OTG_IRQ_EN);
1341                 if (!otg->default_a)
1342                         enable_vbus_draw(isp, 0);
1343                 usb_gadget_vbus_disconnect(otg->gadget);
1344                 otg->gadget = NULL;
1345                 power_down(isp);
1346                 return 0;
1347         }
1348 
1349 #ifdef  CONFIG_USB_OTG
1350         otg->gadget = gadget;
1351         dev_dbg(&isp->client->dev, "registered gadget\n");
1352         /* gadget driver may be suspended until vbus_connect () */
1353         if (otg->host)
1354                 return isp1301_otg_enable(isp);
1355         return 0;
1356 
1357 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1358         otg->gadget = gadget;
1359         // FIXME update its refcount
1360 
1361         {
1362                 u32 l;
1363 
1364                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1365                 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1366                 l |= OTG_ID;
1367                 omap_writel(l, OTG_CTRL);
1368         }
1369 
1370         power_up(isp);
1371         isp->phy.state = OTG_STATE_B_IDLE;
1372 
1373         if (machine_is_omap_h2() || machine_is_omap_h3())
1374                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1375 
1376         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1377                 INTR_SESS_VLD);
1378         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1379                 INTR_VBUS_VLD);
1380         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1381         dump_regs(isp, __func__);
1382 
1383         /* If this has a Mini-AB connector, this mode is highly
1384          * nonstandard ... but can be handy for testing, so long
1385          * as you don't plug a Mini-A cable into the jack.
1386          */
1387         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1388                 b_peripheral(isp);
1389 
1390         return 0;
1391 
1392 #else
1393         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1394         return -EINVAL;
1395 #endif
1396 }
1397 
1398 
1399 /*-------------------------------------------------------------------------*/
1400 
1401 static int
1402 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1403 {
1404         if (!the_transceiver)
1405                 return -ENODEV;
1406         if (dev->state == OTG_STATE_B_PERIPHERAL)
1407                 enable_vbus_draw(the_transceiver, mA);
1408         return 0;
1409 }
1410 
1411 static int
1412 isp1301_start_srp(struct usb_otg *otg)
1413 {
1414         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1415         u32             otg_ctrl;
1416 
1417         if (isp != the_transceiver || isp->phy.state != OTG_STATE_B_IDLE)
1418                 return -ENODEV;
1419 
1420         otg_ctrl = omap_readl(OTG_CTRL);
1421         if (!(otg_ctrl & OTG_BSESSEND))
1422                 return -EINVAL;
1423 
1424         otg_ctrl |= OTG_B_BUSREQ;
1425         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1426         omap_writel(otg_ctrl, OTG_CTRL);
1427         isp->phy.state = OTG_STATE_B_SRP_INIT;
1428 
1429         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1430                         omap_readl(OTG_CTRL));
1431 #ifdef  CONFIG_USB_OTG
1432         check_state(isp, __func__);
1433 #endif
1434         return 0;
1435 }
1436 
1437 static int
1438 isp1301_start_hnp(struct usb_otg *otg)
1439 {
1440 #ifdef  CONFIG_USB_OTG
1441         struct isp1301  *isp = container_of(otg->phy, struct isp1301, phy);
1442         u32 l;
1443 
1444         if (isp != the_transceiver)
1445                 return -ENODEV;
1446         if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1447                 return -ENOTCONN;
1448         if (!otg->default_a && (otg->gadget == NULL
1449                         || !otg->gadget->b_hnp_enable))
1450                 return -ENOTCONN;
1451 
1452         /* We want hardware to manage most HNP protocol timings.
1453          * So do this part as early as possible...
1454          */
1455         switch (isp->phy.state) {
1456         case OTG_STATE_B_HOST:
1457                 isp->phy.state = OTG_STATE_B_PERIPHERAL;
1458                 /* caller will suspend next */
1459                 break;
1460         case OTG_STATE_A_HOST:
1461 #if 0
1462                 /* autoconnect mode avoids irq latency bugs */
1463                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1464                                 MC1_BDIS_ACON_EN);
1465 #endif
1466                 /* caller must suspend then clear A_BUSREQ */
1467                 usb_gadget_vbus_connect(otg->gadget);
1468                 l = omap_readl(OTG_CTRL);
1469                 l |= OTG_A_SETB_HNPEN;
1470                 omap_writel(l, OTG_CTRL);
1471 
1472                 break;
1473         case OTG_STATE_A_PERIPHERAL:
1474                 /* initiated by B-Host suspend */
1475                 break;
1476         default:
1477                 return -EILSEQ;
1478         }
1479         pr_debug("otg: HNP %s, %06x ...\n",
1480                 state_name(isp), omap_readl(OTG_CTRL));
1481         check_state(isp, __func__);
1482         return 0;
1483 #else
1484         /* srp-only */
1485         return -EINVAL;
1486 #endif
1487 }
1488 
1489 /*-------------------------------------------------------------------------*/
1490 
1491 static int
1492 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1493 {
1494         int                     status;
1495         struct isp1301          *isp;
1496 
1497         if (the_transceiver)
1498                 return 0;
1499 
1500         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1501         if (!isp)
1502                 return 0;
1503 
1504         isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1505         if (!isp->phy.otg) {
1506                 kfree(isp);
1507                 return 0;
1508         }
1509 
1510         INIT_WORK(&isp->work, isp1301_work);
1511         init_timer(&isp->timer);
1512         isp->timer.function = isp1301_timer;
1513         isp->timer.data = (unsigned long) isp;
1514 
1515         i2c_set_clientdata(i2c, isp);
1516         isp->client = i2c;
1517 
1518         /* verify the chip (shouldn't be necessary) */
1519         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1520         if (status != I2C_VENDOR_ID_PHILIPS) {
1521                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1522                 goto fail;
1523         }
1524         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1525         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1526                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1527                 goto fail;
1528         }
1529         isp->i2c_release = i2c->dev.release;
1530         i2c->dev.release = isp1301_release;
1531 
1532         /* initial development used chiprev 2.00 */
1533         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1534         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1535                 status >> 8, status & 0xff);
1536 
1537         /* make like power-on reset */
1538         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1539 
1540         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1541         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1542 
1543         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1544                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1545         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1546                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1547 
1548         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1549         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1550         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1551 
1552 #ifdef  CONFIG_USB_OTG
1553         status = otg_bind(isp);
1554         if (status < 0) {
1555                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1556                 goto fail;
1557         }
1558 #endif
1559 
1560         if (machine_is_omap_h2()) {
1561                 /* full speed signaling by default */
1562                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1563                         MC1_SPEED);
1564                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1565                         MC2_SPD_SUSP_CTRL);
1566 
1567                 /* IRQ wired at M14 */
1568                 omap_cfg_reg(M14_1510_GPIO2);
1569                 if (gpio_request(2, "isp1301") == 0)
1570                         gpio_direction_input(2);
1571                 isp->irq_type = IRQF_TRIGGER_FALLING;
1572         }
1573 
1574         status = request_irq(i2c->irq, isp1301_irq,
1575                         isp->irq_type, DRIVER_NAME, isp);
1576         if (status < 0) {
1577                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1578                                 i2c->irq, status);
1579                 goto fail;
1580         }
1581 
1582         isp->phy.dev = &i2c->dev;
1583         isp->phy.label = DRIVER_NAME;
1584         isp->phy.set_power = isp1301_set_power,
1585 
1586         isp->phy.otg->phy = &isp->phy;
1587         isp->phy.otg->set_host = isp1301_set_host,
1588         isp->phy.otg->set_peripheral = isp1301_set_peripheral,
1589         isp->phy.otg->start_srp = isp1301_start_srp,
1590         isp->phy.otg->start_hnp = isp1301_start_hnp,
1591 
1592         enable_vbus_draw(isp, 0);
1593         power_down(isp);
1594         the_transceiver = isp;
1595 
1596 #ifdef  CONFIG_USB_OTG
1597         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1598         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1599 #endif
1600 
1601         dump_regs(isp, __func__);
1602 
1603 #ifdef  VERBOSE
1604         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1605         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1606 #endif
1607 
1608         status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1609         if (status < 0)
1610                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1611                         status);
1612 
1613         return 0;
1614 
1615 fail:
1616         kfree(isp->phy.otg);
1617         kfree(isp);
1618         return -ENODEV;
1619 }
1620 
1621 static const struct i2c_device_id isp1301_id[] = {
1622         { "isp1301_omap", 0 },
1623         { }
1624 };
1625 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1626 
1627 static struct i2c_driver isp1301_driver = {
1628         .driver = {
1629                 .name   = "isp1301_omap",
1630         },
1631         .probe          = isp1301_probe,
1632         .remove         = isp1301_remove,
1633         .id_table       = isp1301_id,
1634 };
1635 
1636 /*-------------------------------------------------------------------------*/
1637 
1638 static int __init isp_init(void)
1639 {
1640         return i2c_add_driver(&isp1301_driver);
1641 }
1642 subsys_initcall(isp_init);
1643 
1644 static void __exit isp_exit(void)
1645 {
1646         if (the_transceiver)
1647                 usb_remove_phy(&the_transceiver->phy);
1648         i2c_del_driver(&isp1301_driver);
1649 }
1650 module_exit(isp_exit);
1651 
1652 

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