USB: Fix double-linking of drivers/usb/otg when ULPI is selected
[linux-2.6.git] / drivers / usb / otg / 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 <plat/usb.h>
40 #include <plat/mux.h>
41
42
43 #ifndef DEBUG
44 #undef  VERBOSE
45 #endif
46
47
48 #define DRIVER_VERSION  "24 August 2004"
49 #define DRIVER_NAME     (isp1301_driver.driver.name)
50
51 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
52 MODULE_LICENSE("GPL");
53
54 struct isp1301 {
55         struct otg_transceiver  otg;
56         struct i2c_client       *client;
57         void                    (*i2c_release)(struct device *dev);
58
59         int                     irq_type;
60
61         u32                     last_otg_ctrl;
62         unsigned                working:1;
63
64         struct timer_list       timer;
65
66         /* use keventd context to change the state for us */
67         struct work_struct      work;
68
69         unsigned long           todo;
70 #               define WORK_UPDATE_ISP  0       /* update ISP from OTG */
71 #               define WORK_UPDATE_OTG  1       /* update OTG from ISP */
72 #               define WORK_HOST_RESUME 4       /* resume host */
73 #               define WORK_TIMER       6       /* timer fired */
74 #               define WORK_STOP        7       /* don't resubmit */
75 };
76
77
78 /* bits in OTG_CTRL */
79
80 #define OTG_XCEIV_OUTPUTS \
81         (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
82 #define OTG_XCEIV_INPUTS \
83         (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
84 #define OTG_CTRL_BITS \
85         (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
86         /* and OTG_PULLUP is sometimes written */
87
88 #define OTG_CTRL_MASK   (OTG_DRIVER_SEL| \
89         OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
90         OTG_CTRL_BITS)
91
92
93 /*-------------------------------------------------------------------------*/
94
95 /* board-specific PM hooks */
96
97 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
98
99 #if     defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
100
101 #include <linux/i2c/tps65010.h>
102
103 #else
104
105 static inline int tps65010_set_vbus_draw(unsigned mA)
106 {
107         pr_debug("tps65010: draw %d mA (STUB)\n", mA);
108         return 0;
109 }
110
111 #endif
112
113 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
114 {
115         int status = tps65010_set_vbus_draw(mA);
116         if (status < 0)
117                 pr_debug("  VBUS %d mA error %d\n", mA, status);
118 }
119
120 #else
121
122 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
123 {
124         /* H4 controls this by DIP switch S2.4; no soft control.
125          * ON means the charger is always enabled.  Leave it OFF
126          * unless the OTG port is used only in B-peripheral mode.
127          */
128 }
129
130 #endif
131
132 static void enable_vbus_source(struct isp1301 *isp)
133 {
134         /* this board won't supply more than 8mA vbus power.
135          * some boards can switch a 100ma "unit load" (or more).
136          */
137 }
138
139
140 /* products will deliver OTG messages with LEDs, GUI, etc */
141 static inline void notresponding(struct isp1301 *isp)
142 {
143         printk(KERN_NOTICE "OTG device not responding.\n");
144 }
145
146
147 /*-------------------------------------------------------------------------*/
148
149 static struct i2c_driver isp1301_driver;
150
151 /* smbus apis are used for portability */
152
153 static inline u8
154 isp1301_get_u8(struct isp1301 *isp, u8 reg)
155 {
156         return i2c_smbus_read_byte_data(isp->client, reg + 0);
157 }
158
159 static inline int
160 isp1301_get_u16(struct isp1301 *isp, u8 reg)
161 {
162         return i2c_smbus_read_word_data(isp->client, reg);
163 }
164
165 static inline int
166 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
167 {
168         return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
169 }
170
171 static inline int
172 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
173 {
174         return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
175 }
176
177 /*-------------------------------------------------------------------------*/
178
179 /* identification */
180 #define ISP1301_VENDOR_ID               0x00    /* u16 read */
181 #define ISP1301_PRODUCT_ID              0x02    /* u16 read */
182 #define ISP1301_BCD_DEVICE              0x14    /* u16 read */
183
184 #define I2C_VENDOR_ID_PHILIPS           0x04cc
185 #define I2C_PRODUCT_ID_PHILIPS_1301     0x1301
186
187 /* operational registers */
188 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
189 #       define  MC1_SPEED               (1 << 0)
190 #       define  MC1_SUSPEND             (1 << 1)
191 #       define  MC1_DAT_SE0             (1 << 2)
192 #       define  MC1_TRANSPARENT         (1 << 3)
193 #       define  MC1_BDIS_ACON_EN        (1 << 4)
194 #       define  MC1_OE_INT_EN           (1 << 5)
195 #       define  MC1_UART_EN             (1 << 6)
196 #       define  MC1_MASK                0x7f
197 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
198 #       define  MC2_GLOBAL_PWR_DN       (1 << 0)
199 #       define  MC2_SPD_SUSP_CTRL       (1 << 1)
200 #       define  MC2_BI_DI               (1 << 2)
201 #       define  MC2_TRANSP_BDIR0        (1 << 3)
202 #       define  MC2_TRANSP_BDIR1        (1 << 4)
203 #       define  MC2_AUDIO_EN            (1 << 5)
204 #       define  MC2_PSW_EN              (1 << 6)
205 #       define  MC2_EN2V7               (1 << 7)
206 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
207 #       define  OTG1_DP_PULLUP          (1 << 0)
208 #       define  OTG1_DM_PULLUP          (1 << 1)
209 #       define  OTG1_DP_PULLDOWN        (1 << 2)
210 #       define  OTG1_DM_PULLDOWN        (1 << 3)
211 #       define  OTG1_ID_PULLDOWN        (1 << 4)
212 #       define  OTG1_VBUS_DRV           (1 << 5)
213 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
214 #       define  OTG1_VBUS_CHRG          (1 << 7)
215 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
216 #       define  OTG_B_SESS_END          (1 << 6)
217 #       define  OTG_B_SESS_VLD          (1 << 7)
218
219 #define ISP1301_INTERRUPT_SOURCE        0x08    /* u8 read */
220 #define ISP1301_INTERRUPT_LATCH         0x0A    /* u8 read, set, +1 clear */
221
222 #define ISP1301_INTERRUPT_FALLING       0x0C    /* u8 read, set, +1 clear */
223 #define ISP1301_INTERRUPT_RISING        0x0E    /* u8 read, set, +1 clear */
224
225 /* same bitfields in all interrupt registers */
226 #       define  INTR_VBUS_VLD           (1 << 0)
227 #       define  INTR_SESS_VLD           (1 << 1)
228 #       define  INTR_DP_HI              (1 << 2)
229 #       define  INTR_ID_GND             (1 << 3)
230 #       define  INTR_DM_HI              (1 << 4)
231 #       define  INTR_ID_FLOAT           (1 << 5)
232 #       define  INTR_BDIS_ACON          (1 << 6)
233 #       define  INTR_CR_INT             (1 << 7)
234
235 /*-------------------------------------------------------------------------*/
236
237 static const char *state_string(enum usb_otg_state state)
238 {
239         switch (state) {
240         case OTG_STATE_A_IDLE:          return "a_idle";
241         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
242         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
243         case OTG_STATE_A_HOST:          return "a_host";
244         case OTG_STATE_A_SUSPEND:       return "a_suspend";
245         case OTG_STATE_A_PERIPHERAL:    return "a_peripheral";
246         case OTG_STATE_A_WAIT_VFALL:    return "a_wait_vfall";
247         case OTG_STATE_A_VBUS_ERR:      return "a_vbus_err";
248         case OTG_STATE_B_IDLE:          return "b_idle";
249         case OTG_STATE_B_SRP_INIT:      return "b_srp_init";
250         case OTG_STATE_B_PERIPHERAL:    return "b_peripheral";
251         case OTG_STATE_B_WAIT_ACON:     return "b_wait_acon";
252         case OTG_STATE_B_HOST:          return "b_host";
253         default:                        return "UNDEFINED";
254         }
255 }
256
257 static inline const char *state_name(struct isp1301 *isp)
258 {
259         return state_string(isp->otg.state);
260 }
261
262 /*-------------------------------------------------------------------------*/
263
264 /* NOTE:  some of this ISP1301 setup is specific to H2 boards;
265  * not everything is guarded by board-specific checks, or even using
266  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
267  *
268  * ALSO:  this currently doesn't use ISP1301 low-power modes
269  * while OTG is running.
270  */
271
272 static void power_down(struct isp1301 *isp)
273 {
274         isp->otg.state = OTG_STATE_UNDEFINED;
275
276         // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
277         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
278
279         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
280         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
281 }
282
283 static void power_up(struct isp1301 *isp)
284 {
285         // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
286         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
287
288         /* do this only when cpu is driving transceiver,
289          * so host won't see a low speed device...
290          */
291         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
292 }
293
294 #define NO_HOST_SUSPEND
295
296 static int host_suspend(struct isp1301 *isp)
297 {
298 #ifdef  NO_HOST_SUSPEND
299         return 0;
300 #else
301         struct device   *dev;
302
303         if (!isp->otg.host)
304                 return -ENODEV;
305
306         /* Currently ASSUMES only the OTG port matters;
307          * other ports could be active...
308          */
309         dev = isp->otg.host->controller;
310         return dev->driver->suspend(dev, 3, 0);
311 #endif
312 }
313
314 static int host_resume(struct isp1301 *isp)
315 {
316 #ifdef  NO_HOST_SUSPEND
317         return 0;
318 #else
319         struct device   *dev;
320
321         if (!isp->otg.host)
322                 return -ENODEV;
323
324         dev = isp->otg.host->controller;
325         return dev->driver->resume(dev, 0);
326 #endif
327 }
328
329 static int gadget_suspend(struct isp1301 *isp)
330 {
331         isp->otg.gadget->b_hnp_enable = 0;
332         isp->otg.gadget->a_hnp_support = 0;
333         isp->otg.gadget->a_alt_hnp_support = 0;
334         return usb_gadget_vbus_disconnect(isp->otg.gadget);
335 }
336
337 /*-------------------------------------------------------------------------*/
338
339 #define TIMER_MINUTES   10
340 #define TIMER_JIFFIES   (TIMER_MINUTES * 60 * HZ)
341
342 /* Almost all our I2C messaging comes from a work queue's task context.
343  * NOTE: guaranteeing certain response times might mean we shouldn't
344  * share keventd's work queue; a realtime task might be safest.
345  */
346 static void isp1301_defer_work(struct isp1301 *isp, int work)
347 {
348         int status;
349
350         if (isp && !test_and_set_bit(work, &isp->todo)) {
351                 (void) get_device(&isp->client->dev);
352                 status = schedule_work(&isp->work);
353                 if (!status && !isp->working)
354                         dev_vdbg(&isp->client->dev,
355                                 "work item %d may be lost\n", work);
356         }
357 }
358
359 /* called from irq handlers */
360 static void a_idle(struct isp1301 *isp, const char *tag)
361 {
362         u32 l;
363
364         if (isp->otg.state == OTG_STATE_A_IDLE)
365                 return;
366
367         isp->otg.default_a = 1;
368         if (isp->otg.host) {
369                 isp->otg.host->is_b_host = 0;
370                 host_suspend(isp);
371         }
372         if (isp->otg.gadget) {
373                 isp->otg.gadget->is_a_peripheral = 1;
374                 gadget_suspend(isp);
375         }
376         isp->otg.state = OTG_STATE_A_IDLE;
377         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
378         omap_writel(l, OTG_CTRL);
379         isp->last_otg_ctrl = l;
380         pr_debug("  --> %s/%s\n", state_name(isp), tag);
381 }
382
383 /* called from irq handlers */
384 static void b_idle(struct isp1301 *isp, const char *tag)
385 {
386         u32 l;
387
388         if (isp->otg.state == OTG_STATE_B_IDLE)
389                 return;
390
391         isp->otg.default_a = 0;
392         if (isp->otg.host) {
393                 isp->otg.host->is_b_host = 1;
394                 host_suspend(isp);
395         }
396         if (isp->otg.gadget) {
397                 isp->otg.gadget->is_a_peripheral = 0;
398                 gadget_suspend(isp);
399         }
400         isp->otg.state = OTG_STATE_B_IDLE;
401         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
402         omap_writel(l, OTG_CTRL);
403         isp->last_otg_ctrl = l;
404         pr_debug("  --> %s/%s\n", state_name(isp), tag);
405 }
406
407 static void
408 dump_regs(struct isp1301 *isp, const char *label)
409 {
410 #ifdef  DEBUG
411         u8      ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
412         u8      status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
413         u8      src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
414
415         pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
416                 omap_readl(OTG_CTRL), label, state_name(isp),
417                 ctrl, status, src);
418         /* mode control and irq enables don't change much */
419 #endif
420 }
421
422 /*-------------------------------------------------------------------------*/
423
424 #ifdef  CONFIG_USB_OTG
425
426 /*
427  * The OMAP OTG controller handles most of the OTG state transitions.
428  *
429  * We translate isp1301 outputs (mostly voltage comparator status) into
430  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
431  * flags into isp1301 inputs ... and infer state transitions.
432  */
433
434 #ifdef  VERBOSE
435
436 static void check_state(struct isp1301 *isp, const char *tag)
437 {
438         enum usb_otg_state      state = OTG_STATE_UNDEFINED;
439         u8                      fsm = omap_readw(OTG_TEST) & 0x0ff;
440         unsigned                extra = 0;
441
442         switch (fsm) {
443
444         /* default-b */
445         case 0x0:
446                 state = OTG_STATE_B_IDLE;
447                 break;
448         case 0x3:
449         case 0x7:
450                 extra = 1;
451         case 0x1:
452                 state = OTG_STATE_B_PERIPHERAL;
453                 break;
454         case 0x11:
455                 state = OTG_STATE_B_SRP_INIT;
456                 break;
457
458         /* extra dual-role default-b states */
459         case 0x12:
460         case 0x13:
461         case 0x16:
462                 extra = 1;
463         case 0x17:
464                 state = OTG_STATE_B_WAIT_ACON;
465                 break;
466         case 0x34:
467                 state = OTG_STATE_B_HOST;
468                 break;
469
470         /* default-a */
471         case 0x36:
472                 state = OTG_STATE_A_IDLE;
473                 break;
474         case 0x3c:
475                 state = OTG_STATE_A_WAIT_VFALL;
476                 break;
477         case 0x7d:
478                 state = OTG_STATE_A_VBUS_ERR;
479                 break;
480         case 0x9e:
481         case 0x9f:
482                 extra = 1;
483         case 0x89:
484                 state = OTG_STATE_A_PERIPHERAL;
485                 break;
486         case 0xb7:
487                 state = OTG_STATE_A_WAIT_VRISE;
488                 break;
489         case 0xb8:
490                 state = OTG_STATE_A_WAIT_BCON;
491                 break;
492         case 0xb9:
493                 state = OTG_STATE_A_HOST;
494                 break;
495         case 0xba:
496                 state = OTG_STATE_A_SUSPEND;
497                 break;
498         default:
499                 break;
500         }
501         if (isp->otg.state == state && !extra)
502                 return;
503         pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
504                 state_string(state), fsm, state_name(isp),
505                 omap_readl(OTG_CTRL));
506 }
507
508 #else
509
510 static inline void check_state(struct isp1301 *isp, const char *tag) { }
511
512 #endif
513
514 /* outputs from ISP1301_INTERRUPT_SOURCE */
515 static void update_otg1(struct isp1301 *isp, u8 int_src)
516 {
517         u32     otg_ctrl;
518
519         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
520         otg_ctrl &= ~OTG_XCEIV_INPUTS;
521         otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
522
523         if (int_src & INTR_SESS_VLD)
524                 otg_ctrl |= OTG_ASESSVLD;
525         else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
526                 a_idle(isp, "vfall");
527                 otg_ctrl &= ~OTG_CTRL_BITS;
528         }
529         if (int_src & INTR_VBUS_VLD)
530                 otg_ctrl |= OTG_VBUSVLD;
531         if (int_src & INTR_ID_GND) {            /* default-A */
532                 if (isp->otg.state == OTG_STATE_B_IDLE
533                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
534                         a_idle(isp, "init");
535                         return;
536                 }
537         } else {                                /* default-B */
538                 otg_ctrl |= OTG_ID;
539                 if (isp->otg.state == OTG_STATE_A_IDLE
540                                 || isp->otg.state == OTG_STATE_UNDEFINED) {
541                         b_idle(isp, "init");
542                         return;
543                 }
544         }
545         omap_writel(otg_ctrl, OTG_CTRL);
546 }
547
548 /* outputs from ISP1301_OTG_STATUS */
549 static void update_otg2(struct isp1301 *isp, u8 otg_status)
550 {
551         u32     otg_ctrl;
552
553         otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
554         otg_ctrl &= ~OTG_XCEIV_INPUTS;
555         otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
556         if (otg_status & OTG_B_SESS_VLD)
557                 otg_ctrl |= OTG_BSESSVLD;
558         else if (otg_status & OTG_B_SESS_END)
559                 otg_ctrl |= OTG_BSESSEND;
560         omap_writel(otg_ctrl, OTG_CTRL);
561 }
562
563 /* inputs going to ISP1301 */
564 static void otg_update_isp(struct isp1301 *isp)
565 {
566         u32     otg_ctrl, otg_change;
567         u8      set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
568
569         otg_ctrl = omap_readl(OTG_CTRL);
570         otg_change = otg_ctrl ^ isp->last_otg_ctrl;
571         isp->last_otg_ctrl = otg_ctrl;
572         otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
573
574         switch (isp->otg.state) {
575         case OTG_STATE_B_IDLE:
576         case OTG_STATE_B_PERIPHERAL:
577         case OTG_STATE_B_SRP_INIT:
578                 if (!(otg_ctrl & OTG_PULLUP)) {
579                         // if (otg_ctrl & OTG_B_HNPEN) {
580                         if (isp->otg.gadget->b_hnp_enable) {
581                                 isp->otg.state = OTG_STATE_B_WAIT_ACON;
582                                 pr_debug("  --> b_wait_acon\n");
583                         }
584                         goto pulldown;
585                 }
586 pullup:
587                 set |= OTG1_DP_PULLUP;
588                 clr |= OTG1_DP_PULLDOWN;
589                 break;
590         case OTG_STATE_A_SUSPEND:
591         case OTG_STATE_A_PERIPHERAL:
592                 if (otg_ctrl & OTG_PULLUP)
593                         goto pullup;
594                 /* FALLTHROUGH */
595         // case OTG_STATE_B_WAIT_ACON:
596         default:
597 pulldown:
598                 set |= OTG1_DP_PULLDOWN;
599                 clr |= OTG1_DP_PULLUP;
600                 break;
601         }
602
603 #       define toggle(OTG,ISP) do { \
604                 if (otg_ctrl & OTG) set |= ISP; \
605                 else clr |= ISP; \
606                 } while (0)
607
608         if (!(isp->otg.host))
609                 otg_ctrl &= ~OTG_DRV_VBUS;
610
611         switch (isp->otg.state) {
612         case OTG_STATE_A_SUSPEND:
613                 if (otg_ctrl & OTG_DRV_VBUS) {
614                         set |= OTG1_VBUS_DRV;
615                         break;
616                 }
617                 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
618                 notresponding(isp);
619
620                 /* FALLTHROUGH */
621         case OTG_STATE_A_VBUS_ERR:
622                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
623                 pr_debug("  --> a_wait_vfall\n");
624                 /* FALLTHROUGH */
625         case OTG_STATE_A_WAIT_VFALL:
626                 /* FIXME usbcore thinks port power is still on ... */
627                 clr |= OTG1_VBUS_DRV;
628                 break;
629         case OTG_STATE_A_IDLE:
630                 if (otg_ctrl & OTG_DRV_VBUS) {
631                         isp->otg.state = OTG_STATE_A_WAIT_VRISE;
632                         pr_debug("  --> a_wait_vrise\n");
633                 }
634                 /* FALLTHROUGH */
635         default:
636                 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
637         }
638
639         toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
640         toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
641
642 #       undef toggle
643
644         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
645         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
646
647         /* HNP switch to host or peripheral; and SRP */
648         if (otg_change & OTG_PULLUP) {
649                 u32 l;
650
651                 switch (isp->otg.state) {
652                 case OTG_STATE_B_IDLE:
653                         if (clr & OTG1_DP_PULLUP)
654                                 break;
655                         isp->otg.state = OTG_STATE_B_PERIPHERAL;
656                         pr_debug("  --> b_peripheral\n");
657                         break;
658                 case OTG_STATE_A_SUSPEND:
659                         if (clr & OTG1_DP_PULLUP)
660                                 break;
661                         isp->otg.state = OTG_STATE_A_PERIPHERAL;
662                         pr_debug("  --> a_peripheral\n");
663                         break;
664                 default:
665                         break;
666                 }
667                 l = omap_readl(OTG_CTRL);
668                 l |= OTG_PULLUP;
669                 omap_writel(l, OTG_CTRL);
670         }
671
672         check_state(isp, __func__);
673         dump_regs(isp, "otg->isp1301");
674 }
675
676 static irqreturn_t omap_otg_irq(int irq, void *_isp)
677 {
678         u16             otg_irq = omap_readw(OTG_IRQ_SRC);
679         u32             otg_ctrl;
680         int             ret = IRQ_NONE;
681         struct isp1301  *isp = _isp;
682
683         /* update ISP1301 transciever from OTG controller */
684         if (otg_irq & OPRT_CHG) {
685                 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
686                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
687                 ret = IRQ_HANDLED;
688
689         /* SRP to become b_peripheral failed */
690         } else if (otg_irq & B_SRP_TMROUT) {
691                 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
692                 notresponding(isp);
693
694                 /* gadget drivers that care should monitor all kinds of
695                  * remote wakeup (SRP, normal) using their own timer
696                  * to give "check cable and A-device" messages.
697                  */
698                 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
699                         b_idle(isp, "srp_timeout");
700
701                 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
702                 ret = IRQ_HANDLED;
703
704         /* HNP to become b_host failed */
705         } else if (otg_irq & B_HNP_FAIL) {
706                 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
707                                 state_name(isp), omap_readl(OTG_CTRL));
708                 notresponding(isp);
709
710                 otg_ctrl = omap_readl(OTG_CTRL);
711                 otg_ctrl |= OTG_BUSDROP;
712                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
713                 omap_writel(otg_ctrl, OTG_CTRL);
714
715                 /* subset of b_peripheral()... */
716                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
717                 pr_debug("  --> b_peripheral\n");
718
719                 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
720                 ret = IRQ_HANDLED;
721
722         /* detect SRP from B-device ... */
723         } else if (otg_irq & A_SRP_DETECT) {
724                 pr_debug("otg: %s SRP_DETECT, %06x\n",
725                                 state_name(isp), omap_readl(OTG_CTRL));
726
727                 isp1301_defer_work(isp, WORK_UPDATE_OTG);
728                 switch (isp->otg.state) {
729                 case OTG_STATE_A_IDLE:
730                         if (!isp->otg.host)
731                                 break;
732                         isp1301_defer_work(isp, WORK_HOST_RESUME);
733                         otg_ctrl = omap_readl(OTG_CTRL);
734                         otg_ctrl |= OTG_A_BUSREQ;
735                         otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
736                                         & ~OTG_XCEIV_INPUTS
737                                         & OTG_CTRL_MASK;
738                         omap_writel(otg_ctrl, OTG_CTRL);
739                         break;
740                 default:
741                         break;
742                 }
743
744                 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
745                 ret = IRQ_HANDLED;
746
747         /* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
748          * we don't track them separately
749          */
750         } else if (otg_irq & A_REQ_TMROUT) {
751                 otg_ctrl = omap_readl(OTG_CTRL);
752                 pr_info("otg: BCON_TMOUT from %s, %06x\n",
753                                 state_name(isp), otg_ctrl);
754                 notresponding(isp);
755
756                 otg_ctrl |= OTG_BUSDROP;
757                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
758                 omap_writel(otg_ctrl, OTG_CTRL);
759                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
760
761                 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
762                 ret = IRQ_HANDLED;
763
764         /* A-supplied voltage fell too low; overcurrent */
765         } else if (otg_irq & A_VBUS_ERR) {
766                 otg_ctrl = omap_readl(OTG_CTRL);
767                 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
768                         state_name(isp), otg_irq, otg_ctrl);
769
770                 otg_ctrl |= OTG_BUSDROP;
771                 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
772                 omap_writel(otg_ctrl, OTG_CTRL);
773                 isp->otg.state = OTG_STATE_A_VBUS_ERR;
774
775                 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
776                 ret = IRQ_HANDLED;
777
778         /* switch driver; the transciever code activates it,
779          * ungating the udc clock or resuming OHCI.
780          */
781         } else if (otg_irq & DRIVER_SWITCH) {
782                 int     kick = 0;
783
784                 otg_ctrl = omap_readl(OTG_CTRL);
785                 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
786                                 state_name(isp),
787                                 (otg_ctrl & OTG_DRIVER_SEL)
788                                         ? "gadget" : "host",
789                                 otg_ctrl);
790                 isp1301_defer_work(isp, WORK_UPDATE_ISP);
791
792                 /* role is peripheral */
793                 if (otg_ctrl & OTG_DRIVER_SEL) {
794                         switch (isp->otg.state) {
795                         case OTG_STATE_A_IDLE:
796                                 b_idle(isp, __func__);
797                                 break;
798                         default:
799                                 break;
800                         }
801                         isp1301_defer_work(isp, WORK_UPDATE_ISP);
802
803                 /* role is host */
804                 } else {
805                         if (!(otg_ctrl & OTG_ID)) {
806                                 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
807                                 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
808                         }
809
810                         if (isp->otg.host) {
811                                 switch (isp->otg.state) {
812                                 case OTG_STATE_B_WAIT_ACON:
813                                         isp->otg.state = OTG_STATE_B_HOST;
814                                         pr_debug("  --> b_host\n");
815                                         kick = 1;
816                                         break;
817                                 case OTG_STATE_A_WAIT_BCON:
818                                         isp->otg.state = OTG_STATE_A_HOST;
819                                         pr_debug("  --> a_host\n");
820                                         break;
821                                 case OTG_STATE_A_PERIPHERAL:
822                                         isp->otg.state = OTG_STATE_A_WAIT_BCON;
823                                         pr_debug("  --> a_wait_bcon\n");
824                                         break;
825                                 default:
826                                         break;
827                                 }
828                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
829                         }
830                 }
831
832                 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
833                 ret = IRQ_HANDLED;
834
835                 if (kick)
836                         usb_bus_start_enum(isp->otg.host,
837                                                 isp->otg.host->otg_port);
838         }
839
840         check_state(isp, __func__);
841         return ret;
842 }
843
844 static struct platform_device *otg_dev;
845
846 static int otg_init(struct isp1301 *isp)
847 {
848         u32 l;
849
850         if (!otg_dev)
851                 return -ENODEV;
852
853         dump_regs(isp, __func__);
854         /* some of these values are board-specific... */
855         l = omap_readl(OTG_SYSCON_2);
856         l |= OTG_EN
857                 /* for B-device: */
858                 | SRP_GPDATA            /* 9msec Bdev D+ pulse */
859                 | SRP_GPDVBUS           /* discharge after VBUS pulse */
860                 // | (3 << 24)          /* 2msec VBUS pulse */
861                 /* for A-device: */
862                 | (0 << 20)             /* 200ms nominal A_WAIT_VRISE timer */
863                 | SRP_DPW               /* detect 167+ns SRP pulses */
864                 | SRP_DATA | SRP_VBUS   /* accept both kinds of SRP pulse */
865                 ;
866         omap_writel(l, OTG_SYSCON_2);
867
868         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
869         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
870
871         check_state(isp, __func__);
872         pr_debug("otg: %s, %s %06x\n",
873                         state_name(isp), __func__, omap_readl(OTG_CTRL));
874
875         omap_writew(DRIVER_SWITCH | OPRT_CHG
876                         | B_SRP_TMROUT | B_HNP_FAIL
877                         | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
878
879         l = omap_readl(OTG_SYSCON_2);
880         l |= OTG_EN;
881         omap_writel(l, OTG_SYSCON_2);
882
883         return 0;
884 }
885
886 static int otg_probe(struct platform_device *dev)
887 {
888         // struct omap_usb_config *config = dev->platform_data;
889
890         otg_dev = dev;
891         return 0;
892 }
893
894 static int otg_remove(struct platform_device *dev)
895 {
896         otg_dev = NULL;
897         return 0;
898 }
899
900 static struct platform_driver omap_otg_driver = {
901         .probe          = otg_probe,
902         .remove         = otg_remove,
903         .driver         = {
904                 .owner  = THIS_MODULE,
905                 .name   = "omap_otg",
906         },
907 };
908
909 static int otg_bind(struct isp1301 *isp)
910 {
911         int     status;
912
913         if (otg_dev)
914                 return -EBUSY;
915
916         status = platform_driver_register(&omap_otg_driver);
917         if (status < 0)
918                 return status;
919
920         if (otg_dev)
921                 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
922                                 IRQF_DISABLED, DRIVER_NAME, isp);
923         else
924                 status = -ENODEV;
925
926         if (status < 0)
927                 platform_driver_unregister(&omap_otg_driver);
928         return status;
929 }
930
931 static void otg_unbind(struct isp1301 *isp)
932 {
933         if (!otg_dev)
934                 return;
935         free_irq(otg_dev->resource[1].start, isp);
936 }
937
938 #else
939
940 /* OTG controller isn't clocked */
941
942 #endif  /* CONFIG_USB_OTG */
943
944 /*-------------------------------------------------------------------------*/
945
946 static void b_peripheral(struct isp1301 *isp)
947 {
948         u32 l;
949
950         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
951         omap_writel(l, OTG_CTRL);
952
953         usb_gadget_vbus_connect(isp->otg.gadget);
954
955 #ifdef  CONFIG_USB_OTG
956         enable_vbus_draw(isp, 8);
957         otg_update_isp(isp);
958 #else
959         enable_vbus_draw(isp, 100);
960         /* UDC driver just set OTG_BSESSVLD */
961         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
962         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
963         isp->otg.state = OTG_STATE_B_PERIPHERAL;
964         pr_debug("  --> b_peripheral\n");
965         dump_regs(isp, "2periph");
966 #endif
967 }
968
969 static void isp_update_otg(struct isp1301 *isp, u8 stat)
970 {
971         u8                      isp_stat, isp_bstat;
972         enum usb_otg_state      state = isp->otg.state;
973
974         if (stat & INTR_BDIS_ACON)
975                 pr_debug("OTG:  BDIS_ACON, %s\n", state_name(isp));
976
977         /* start certain state transitions right away */
978         isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
979         if (isp_stat & INTR_ID_GND) {
980                 if (isp->otg.default_a) {
981                         switch (state) {
982                         case OTG_STATE_B_IDLE:
983                                 a_idle(isp, "idle");
984                                 /* FALLTHROUGH */
985                         case OTG_STATE_A_IDLE:
986                                 enable_vbus_source(isp);
987                                 /* FALLTHROUGH */
988                         case OTG_STATE_A_WAIT_VRISE:
989                                 /* we skip over OTG_STATE_A_WAIT_BCON, since
990                                  * the HC will transition to A_HOST (or
991                                  * A_SUSPEND!) without our noticing except
992                                  * when HNP is used.
993                                  */
994                                 if (isp_stat & INTR_VBUS_VLD)
995                                         isp->otg.state = OTG_STATE_A_HOST;
996                                 break;
997                         case OTG_STATE_A_WAIT_VFALL:
998                                 if (!(isp_stat & INTR_SESS_VLD))
999                                         a_idle(isp, "vfell");
1000                                 break;
1001                         default:
1002                                 if (!(isp_stat & INTR_VBUS_VLD))
1003                                         isp->otg.state = OTG_STATE_A_VBUS_ERR;
1004                                 break;
1005                         }
1006                         isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1007                 } else {
1008                         switch (state) {
1009                         case OTG_STATE_B_PERIPHERAL:
1010                         case OTG_STATE_B_HOST:
1011                         case OTG_STATE_B_WAIT_ACON:
1012                                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1013                                 break;
1014                         default:
1015                                 break;
1016                         }
1017                         if (state != OTG_STATE_A_IDLE)
1018                                 a_idle(isp, "id");
1019                         if (isp->otg.host && state == OTG_STATE_A_IDLE)
1020                                 isp1301_defer_work(isp, WORK_HOST_RESUME);
1021                         isp_bstat = 0;
1022                 }
1023         } else {
1024                 u32 l;
1025
1026                 /* if user unplugged mini-A end of cable,
1027                  * don't bypass A_WAIT_VFALL.
1028                  */
1029                 if (isp->otg.default_a) {
1030                         switch (state) {
1031                         default:
1032                                 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1033                                 break;
1034                         case OTG_STATE_A_WAIT_VFALL:
1035                                 state = OTG_STATE_A_IDLE;
1036                                 /* khubd may take a while to notice and
1037                                  * handle this disconnect, so don't go
1038                                  * to B_IDLE quite yet.
1039                                  */
1040                                 break;
1041                         case OTG_STATE_A_IDLE:
1042                                 host_suspend(isp);
1043                                 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1044                                                 MC1_BDIS_ACON_EN);
1045                                 isp->otg.state = OTG_STATE_B_IDLE;
1046                                 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1047                                 l &= ~OTG_CTRL_BITS;
1048                                 omap_writel(l, OTG_CTRL);
1049                                 break;
1050                         case OTG_STATE_B_IDLE:
1051                                 break;
1052                         }
1053                 }
1054                 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1055
1056                 switch (isp->otg.state) {
1057                 case OTG_STATE_B_PERIPHERAL:
1058                 case OTG_STATE_B_WAIT_ACON:
1059                 case OTG_STATE_B_HOST:
1060                         if (likely(isp_bstat & OTG_B_SESS_VLD))
1061                                 break;
1062                         enable_vbus_draw(isp, 0);
1063 #ifndef CONFIG_USB_OTG
1064                         /* UDC driver will clear OTG_BSESSVLD */
1065                         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1066                                                 OTG1_DP_PULLDOWN);
1067                         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1068                                                 OTG1_DP_PULLUP);
1069                         dump_regs(isp, __func__);
1070 #endif
1071                         /* FALLTHROUGH */
1072                 case OTG_STATE_B_SRP_INIT:
1073                         b_idle(isp, __func__);
1074                         l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1075                         omap_writel(l, OTG_CTRL);
1076                         /* FALLTHROUGH */
1077                 case OTG_STATE_B_IDLE:
1078                         if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1079 #ifdef  CONFIG_USB_OTG
1080                                 update_otg1(isp, isp_stat);
1081                                 update_otg2(isp, isp_bstat);
1082 #endif
1083                                 b_peripheral(isp);
1084                         } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1085                                 isp_bstat |= OTG_B_SESS_END;
1086                         break;
1087                 case OTG_STATE_A_WAIT_VFALL:
1088                         break;
1089                 default:
1090                         pr_debug("otg: unsupported b-device %s\n",
1091                                 state_name(isp));
1092                         break;
1093                 }
1094         }
1095
1096         if (state != isp->otg.state)
1097                 pr_debug("  isp, %s -> %s\n",
1098                                 state_string(state), state_name(isp));
1099
1100 #ifdef  CONFIG_USB_OTG
1101         /* update the OTG controller state to match the isp1301; may
1102          * trigger OPRT_CHG irqs for changes going to the isp1301.
1103          */
1104         update_otg1(isp, isp_stat);
1105         update_otg2(isp, isp_bstat);
1106         check_state(isp, __func__);
1107 #endif
1108
1109         dump_regs(isp, "isp1301->otg");
1110 }
1111
1112 /*-------------------------------------------------------------------------*/
1113
1114 static u8 isp1301_clear_latch(struct isp1301 *isp)
1115 {
1116         u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1117         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1118         return latch;
1119 }
1120
1121 static void
1122 isp1301_work(struct work_struct *work)
1123 {
1124         struct isp1301  *isp = container_of(work, struct isp1301, work);
1125         int             stop;
1126
1127         /* implicit lock:  we're the only task using this device */
1128         isp->working = 1;
1129         do {
1130                 stop = test_bit(WORK_STOP, &isp->todo);
1131
1132 #ifdef  CONFIG_USB_OTG
1133                 /* transfer state from otg engine to isp1301 */
1134                 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1135                         otg_update_isp(isp);
1136                         put_device(&isp->client->dev);
1137                 }
1138 #endif
1139                 /* transfer state from isp1301 to otg engine */
1140                 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1141                         u8              stat = isp1301_clear_latch(isp);
1142
1143                         isp_update_otg(isp, stat);
1144                         put_device(&isp->client->dev);
1145                 }
1146
1147                 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1148                         u32     otg_ctrl;
1149
1150                         /*
1151                          * skip A_WAIT_VRISE; hc transitions invisibly
1152                          * skip A_WAIT_BCON; same.
1153                          */
1154                         switch (isp->otg.state) {
1155                         case OTG_STATE_A_WAIT_BCON:
1156                         case OTG_STATE_A_WAIT_VRISE:
1157                                 isp->otg.state = OTG_STATE_A_HOST;
1158                                 pr_debug("  --> a_host\n");
1159                                 otg_ctrl = omap_readl(OTG_CTRL);
1160                                 otg_ctrl |= OTG_A_BUSREQ;
1161                                 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1162                                                 & OTG_CTRL_MASK;
1163                                 omap_writel(otg_ctrl, OTG_CTRL);
1164                                 break;
1165                         case OTG_STATE_B_WAIT_ACON:
1166                                 isp->otg.state = OTG_STATE_B_HOST;
1167                                 pr_debug("  --> b_host (acon)\n");
1168                                 break;
1169                         case OTG_STATE_B_HOST:
1170                         case OTG_STATE_B_IDLE:
1171                         case OTG_STATE_A_IDLE:
1172                                 break;
1173                         default:
1174                                 pr_debug("  host resume in %s\n",
1175                                                 state_name(isp));
1176                         }
1177                         host_resume(isp);
1178                         // mdelay(10);
1179                         put_device(&isp->client->dev);
1180                 }
1181
1182                 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1183 #ifdef  VERBOSE
1184                         dump_regs(isp, "timer");
1185                         if (!stop)
1186                                 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1187 #endif
1188                         put_device(&isp->client->dev);
1189                 }
1190
1191                 if (isp->todo)
1192                         dev_vdbg(&isp->client->dev,
1193                                 "work done, todo = 0x%lx\n",
1194                                 isp->todo);
1195                 if (stop) {
1196                         dev_dbg(&isp->client->dev, "stop\n");
1197                         break;
1198                 }
1199         } while (isp->todo);
1200         isp->working = 0;
1201 }
1202
1203 static irqreturn_t isp1301_irq(int irq, void *isp)
1204 {
1205         isp1301_defer_work(isp, WORK_UPDATE_OTG);
1206         return IRQ_HANDLED;
1207 }
1208
1209 static void isp1301_timer(unsigned long _isp)
1210 {
1211         isp1301_defer_work((void *)_isp, WORK_TIMER);
1212 }
1213
1214 /*-------------------------------------------------------------------------*/
1215
1216 static void isp1301_release(struct device *dev)
1217 {
1218         struct isp1301  *isp;
1219
1220         isp = dev_get_drvdata(dev);
1221
1222         /* FIXME -- not with a "new style" driver, it doesn't!! */
1223
1224         /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1225         if (isp->i2c_release)
1226                 isp->i2c_release(dev);
1227         kfree (isp);
1228 }
1229
1230 static struct isp1301 *the_transceiver;
1231
1232 static int __exit isp1301_remove(struct i2c_client *i2c)
1233 {
1234         struct isp1301  *isp;
1235
1236         isp = i2c_get_clientdata(i2c);
1237
1238         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1239         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1240         free_irq(i2c->irq, isp);
1241 #ifdef  CONFIG_USB_OTG
1242         otg_unbind(isp);
1243 #endif
1244         if (machine_is_omap_h2())
1245                 gpio_free(2);
1246
1247         isp->timer.data = 0;
1248         set_bit(WORK_STOP, &isp->todo);
1249         del_timer_sync(&isp->timer);
1250         flush_scheduled_work();
1251
1252         put_device(&i2c->dev);
1253         the_transceiver = NULL;
1254
1255         return 0;
1256 }
1257
1258 /*-------------------------------------------------------------------------*/
1259
1260 /* NOTE:  three modes are possible here, only one of which
1261  * will be standards-conformant on any given system:
1262  *
1263  *  - OTG mode (dual-role), required if there's a Mini-AB connector
1264  *  - HOST mode, for when there's one or more A (host) connectors
1265  *  - DEVICE mode, for when there's a B/Mini-B (device) connector
1266  *
1267  * As a rule, you won't have an isp1301 chip unless it's there to
1268  * support the OTG mode.  Other modes help testing USB controllers
1269  * in isolation from (full) OTG support, or maybe so later board
1270  * revisions can help to support those feature.
1271  */
1272
1273 #ifdef  CONFIG_USB_OTG
1274
1275 static int isp1301_otg_enable(struct isp1301 *isp)
1276 {
1277         power_up(isp);
1278         otg_init(isp);
1279
1280         /* NOTE:  since we don't change this, this provides
1281          * a few more interrupts than are strictly needed.
1282          */
1283         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1284                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1285         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1286                 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1287
1288         dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1289
1290         return 0;
1291 }
1292
1293 #endif
1294
1295 /* add or disable the host device+driver */
1296 static int
1297 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1298 {
1299         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1300
1301         if (!otg || isp != the_transceiver)
1302                 return -ENODEV;
1303
1304         if (!host) {
1305                 omap_writew(0, OTG_IRQ_EN);
1306                 power_down(isp);
1307                 isp->otg.host = NULL;
1308                 return 0;
1309         }
1310
1311 #ifdef  CONFIG_USB_OTG
1312         isp->otg.host = host;
1313         dev_dbg(&isp->client->dev, "registered host\n");
1314         host_suspend(isp);
1315         if (isp->otg.gadget)
1316                 return isp1301_otg_enable(isp);
1317         return 0;
1318
1319 #elif   !defined(CONFIG_USB_GADGET_OMAP)
1320         // FIXME update its refcount
1321         isp->otg.host = host;
1322
1323         power_up(isp);
1324
1325         if (machine_is_omap_h2())
1326                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1327
1328         dev_info(&isp->client->dev, "A-Host sessions ok\n");
1329         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1330                 INTR_ID_GND);
1331         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1332                 INTR_ID_GND);
1333
1334         /* If this has a Mini-AB connector, this mode is highly
1335          * nonstandard ... but can be handy for testing, especially with
1336          * the Mini-A end of an OTG cable.  (Or something nonstandard
1337          * like MiniB-to-StandardB, maybe built with a gender mender.)
1338          */
1339         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1340
1341         dump_regs(isp, __func__);
1342
1343         return 0;
1344
1345 #else
1346         dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1347         return -EINVAL;
1348 #endif
1349
1350 }
1351
1352 static int
1353 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1354 {
1355         struct isp1301  *isp = container_of(otg, struct isp1301, otg);
1356 #ifndef CONFIG_USB_OTG
1357         u32 l;
1358 #endif
1359
1360         if (!otg || isp != the_transceiver)
1361                 return -ENODEV;
1362
1363         if (!gadget) {
1364                 omap_writew(0, OTG_IRQ_EN);
1365                 if (!isp->otg.default_a)
1366                         enable_vbus_draw(isp, 0);
1367                 usb_gadget_vbus_disconnect(isp->otg.gadget);
1368                 isp->otg.gadget = NULL;
1369                 power_down(isp);
1370                 return 0;
1371         }
1372
1373 #ifdef  CONFIG_USB_OTG
1374         isp->otg.gadget = gadget;
1375         dev_dbg(&isp->client->dev, "registered gadget\n");
1376         /* gadget driver may be suspended until vbus_connect () */
1377         if (isp->otg.host)
1378                 return isp1301_otg_enable(isp);
1379         return 0;
1380
1381 #elif   !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1382         isp->otg.gadget = gadget;
1383         // FIXME update its refcount
1384
1385         l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1386         l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1387         l |= OTG_ID;
1388         omap_writel(l, OTG_CTRL);
1389
1390         power_up(isp);
1391         isp->otg.state = OTG_STATE_B_IDLE;
1392
1393         if (machine_is_omap_h2() || machine_is_omap_h3())
1394                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1395
1396         isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1397                 INTR_SESS_VLD);
1398         isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1399                 INTR_VBUS_VLD);
1400         dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1401         dump_regs(isp, __func__);
1402
1403         /* If this has a Mini-AB connector, this mode is highly
1404          * nonstandard ... but can be handy for testing, so long
1405          * as you don't plug a Mini-A cable into the jack.
1406          */
1407         if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1408                 b_peripheral(isp);
1409
1410         return 0;
1411
1412 #else
1413         dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1414         return -EINVAL;
1415 #endif
1416 }
1417
1418
1419 /*-------------------------------------------------------------------------*/
1420
1421 static int
1422 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1423 {
1424         if (!the_transceiver)
1425                 return -ENODEV;
1426         if (dev->state == OTG_STATE_B_PERIPHERAL)
1427                 enable_vbus_draw(the_transceiver, mA);
1428         return 0;
1429 }
1430
1431 static int
1432 isp1301_start_srp(struct otg_transceiver *dev)
1433 {
1434         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1435         u32             otg_ctrl;
1436
1437         if (!dev || isp != the_transceiver
1438                         || isp->otg.state != OTG_STATE_B_IDLE)
1439                 return -ENODEV;
1440
1441         otg_ctrl = omap_readl(OTG_CTRL);
1442         if (!(otg_ctrl & OTG_BSESSEND))
1443                 return -EINVAL;
1444
1445         otg_ctrl |= OTG_B_BUSREQ;
1446         otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1447         omap_writel(otg_ctrl, OTG_CTRL);
1448         isp->otg.state = OTG_STATE_B_SRP_INIT;
1449
1450         pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1451                         omap_readl(OTG_CTRL));
1452 #ifdef  CONFIG_USB_OTG
1453         check_state(isp, __func__);
1454 #endif
1455         return 0;
1456 }
1457
1458 static int
1459 isp1301_start_hnp(struct otg_transceiver *dev)
1460 {
1461 #ifdef  CONFIG_USB_OTG
1462         struct isp1301  *isp = container_of(dev, struct isp1301, otg);
1463         u32 l;
1464
1465         if (!dev || isp != the_transceiver)
1466                 return -ENODEV;
1467         if (isp->otg.default_a && (isp->otg.host == NULL
1468                         || !isp->otg.host->b_hnp_enable))
1469                 return -ENOTCONN;
1470         if (!isp->otg.default_a && (isp->otg.gadget == NULL
1471                         || !isp->otg.gadget->b_hnp_enable))
1472                 return -ENOTCONN;
1473
1474         /* We want hardware to manage most HNP protocol timings.
1475          * So do this part as early as possible...
1476          */
1477         switch (isp->otg.state) {
1478         case OTG_STATE_B_HOST:
1479                 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1480                 /* caller will suspend next */
1481                 break;
1482         case OTG_STATE_A_HOST:
1483 #if 0
1484                 /* autoconnect mode avoids irq latency bugs */
1485                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1486                                 MC1_BDIS_ACON_EN);
1487 #endif
1488                 /* caller must suspend then clear A_BUSREQ */
1489                 usb_gadget_vbus_connect(isp->otg.gadget);
1490                 l = omap_readl(OTG_CTRL);
1491                 l |= OTG_A_SETB_HNPEN;
1492                 omap_writel(l, OTG_CTRL);
1493
1494                 break;
1495         case OTG_STATE_A_PERIPHERAL:
1496                 /* initiated by B-Host suspend */
1497                 break;
1498         default:
1499                 return -EILSEQ;
1500         }
1501         pr_debug("otg: HNP %s, %06x ...\n",
1502                 state_name(isp), omap_readl(OTG_CTRL));
1503         check_state(isp, __func__);
1504         return 0;
1505 #else
1506         /* srp-only */
1507         return -EINVAL;
1508 #endif
1509 }
1510
1511 /*-------------------------------------------------------------------------*/
1512
1513 static int __init
1514 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1515 {
1516         int                     status;
1517         struct isp1301          *isp;
1518
1519         if (the_transceiver)
1520                 return 0;
1521
1522         isp = kzalloc(sizeof *isp, GFP_KERNEL);
1523         if (!isp)
1524                 return 0;
1525
1526         INIT_WORK(&isp->work, isp1301_work);
1527         init_timer(&isp->timer);
1528         isp->timer.function = isp1301_timer;
1529         isp->timer.data = (unsigned long) isp;
1530
1531         i2c_set_clientdata(i2c, isp);
1532         isp->client = i2c;
1533
1534         /* verify the chip (shouldn't be necesary) */
1535         status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1536         if (status != I2C_VENDOR_ID_PHILIPS) {
1537                 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1538                 goto fail;
1539         }
1540         status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1541         if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1542                 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1543                 goto fail;
1544         }
1545         isp->i2c_release = i2c->dev.release;
1546         i2c->dev.release = isp1301_release;
1547
1548         /* initial development used chiprev 2.00 */
1549         status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1550         dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1551                 status >> 8, status & 0xff);
1552
1553         /* make like power-on reset */
1554         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1555
1556         isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1557         isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1558
1559         isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1560                                 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1561         isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1562                                 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1563
1564         isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1565         isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1566         isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1567
1568 #ifdef  CONFIG_USB_OTG
1569         status = otg_bind(isp);
1570         if (status < 0) {
1571                 dev_dbg(&i2c->dev, "can't bind OTG\n");
1572                 goto fail;
1573         }
1574 #endif
1575
1576         if (machine_is_omap_h2()) {
1577                 /* full speed signaling by default */
1578                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1579                         MC1_SPEED);
1580                 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1581                         MC2_SPD_SUSP_CTRL);
1582
1583                 /* IRQ wired at M14 */
1584                 omap_cfg_reg(M14_1510_GPIO2);
1585                 if (gpio_request(2, "isp1301") == 0)
1586                         gpio_direction_input(2);
1587                 isp->irq_type = IRQF_TRIGGER_FALLING;
1588         }
1589
1590         isp->irq_type |= IRQF_SAMPLE_RANDOM;
1591         status = request_irq(i2c->irq, isp1301_irq,
1592                         isp->irq_type, DRIVER_NAME, isp);
1593         if (status < 0) {
1594                 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1595                                 i2c->irq, status);
1596                 goto fail;
1597         }
1598
1599         isp->otg.dev = &i2c->dev;
1600         isp->otg.label = DRIVER_NAME;
1601
1602         isp->otg.set_host = isp1301_set_host,
1603         isp->otg.set_peripheral = isp1301_set_peripheral,
1604         isp->otg.set_power = isp1301_set_power,
1605         isp->otg.start_srp = isp1301_start_srp,
1606         isp->otg.start_hnp = isp1301_start_hnp,
1607
1608         enable_vbus_draw(isp, 0);
1609         power_down(isp);
1610         the_transceiver = isp;
1611
1612 #ifdef  CONFIG_USB_OTG
1613         update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1614         update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1615 #endif
1616
1617         dump_regs(isp, __func__);
1618
1619 #ifdef  VERBOSE
1620         mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1621         dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1622 #endif
1623
1624         status = otg_set_transceiver(&isp->otg);
1625         if (status < 0)
1626                 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1627                         status);
1628
1629         return 0;
1630
1631 fail:
1632         kfree(isp);
1633         return -ENODEV;
1634 }
1635
1636 static const struct i2c_device_id isp1301_id[] = {
1637         { "isp1301_omap", 0 },
1638         { }
1639 };
1640 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1641
1642 static struct i2c_driver isp1301_driver = {
1643         .driver = {
1644                 .name   = "isp1301_omap",
1645         },
1646         .probe          = isp1301_probe,
1647         .remove         = __exit_p(isp1301_remove),
1648         .id_table       = isp1301_id,
1649 };
1650
1651 /*-------------------------------------------------------------------------*/
1652
1653 static int __init isp_init(void)
1654 {
1655         return i2c_add_driver(&isp1301_driver);
1656 }
1657 module_init(isp_init);
1658
1659 static void __exit isp_exit(void)
1660 {
1661         if (the_transceiver)
1662                 otg_set_transceiver(NULL);
1663         i2c_del_driver(&isp1301_driver);
1664 }
1665 module_exit(isp_exit);
1666