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isp1301_omap.c
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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 #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 usb_phy phy;
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 inline const char *state_name(struct isp1301 *isp)
238 {
239  return otg_state_string(isp->phy.state);
240 }
241 
242 /*-------------------------------------------------------------------------*/
243 
244 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
245  * not everything is guarded by board-specific checks, or even using
246  * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
247  *
248  * ALSO: this currently doesn't use ISP1301 low-power modes
249  * while OTG is running.
250  */
251 
252 static void power_down(struct isp1301 *isp)
253 {
254  isp->phy.state = OTG_STATE_UNDEFINED;
255 
256  // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
257  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
258 
259  isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
260  isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
261 }
262 
263 static void power_up(struct isp1301 *isp)
264 {
265  // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
266  isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
267 
268  /* do this only when cpu is driving transceiver,
269  * so host won't see a low speed device...
270  */
271  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
272 }
273 
274 #define NO_HOST_SUSPEND
275 
276 static int host_suspend(struct isp1301 *isp)
277 {
278 #ifdef NO_HOST_SUSPEND
279  return 0;
280 #else
281  struct device *dev;
282 
283  if (!isp->phy.otg->host)
284  return -ENODEV;
285 
286  /* Currently ASSUMES only the OTG port matters;
287  * other ports could be active...
288  */
289  dev = isp->phy.otg->host->controller;
290  return dev->driver->suspend(dev, 3, 0);
291 #endif
292 }
293 
294 static int host_resume(struct isp1301 *isp)
295 {
296 #ifdef NO_HOST_SUSPEND
297  return 0;
298 #else
299  struct device *dev;
300 
301  if (!isp->phy.otg->host)
302  return -ENODEV;
303 
304  dev = isp->phy.otg->host->controller;
305  return dev->driver->resume(dev, 0);
306 #endif
307 }
308 
309 static int gadget_suspend(struct isp1301 *isp)
310 {
311  isp->phy.otg->gadget->b_hnp_enable = 0;
312  isp->phy.otg->gadget->a_hnp_support = 0;
313  isp->phy.otg->gadget->a_alt_hnp_support = 0;
314  return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
315 }
316 
317 /*-------------------------------------------------------------------------*/
318 
319 #define TIMER_MINUTES 10
320 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
321 
322 /* Almost all our I2C messaging comes from a work queue's task context.
323  * NOTE: guaranteeing certain response times might mean we shouldn't
324  * share keventd's work queue; a realtime task might be safest.
325  */
326 static void isp1301_defer_work(struct isp1301 *isp, int work)
327 {
328  int status;
329 
330  if (isp && !test_and_set_bit(work, &isp->todo)) {
331  (void) get_device(&isp->client->dev);
332  status = schedule_work(&isp->work);
333  if (!status && !isp->working)
334  dev_vdbg(&isp->client->dev,
335  "work item %d may be lost\n", work);
336  }
337 }
338 
339 /* called from irq handlers */
340 static void a_idle(struct isp1301 *isp, const char *tag)
341 {
342  u32 l;
343 
344  if (isp->phy.state == OTG_STATE_A_IDLE)
345  return;
346 
347  isp->phy.otg->default_a = 1;
348  if (isp->phy.otg->host) {
349  isp->phy.otg->host->is_b_host = 0;
350  host_suspend(isp);
351  }
352  if (isp->phy.otg->gadget) {
353  isp->phy.otg->gadget->is_a_peripheral = 1;
354  gadget_suspend(isp);
355  }
356  isp->phy.state = OTG_STATE_A_IDLE;
357  l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
358  omap_writel(l, OTG_CTRL);
359  isp->last_otg_ctrl = l;
360  pr_debug(" --> %s/%s\n", state_name(isp), tag);
361 }
362 
363 /* called from irq handlers */
364 static void b_idle(struct isp1301 *isp, const char *tag)
365 {
366  u32 l;
367 
368  if (isp->phy.state == OTG_STATE_B_IDLE)
369  return;
370 
371  isp->phy.otg->default_a = 0;
372  if (isp->phy.otg->host) {
373  isp->phy.otg->host->is_b_host = 1;
374  host_suspend(isp);
375  }
376  if (isp->phy.otg->gadget) {
377  isp->phy.otg->gadget->is_a_peripheral = 0;
378  gadget_suspend(isp);
379  }
380  isp->phy.state = OTG_STATE_B_IDLE;
381  l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
382  omap_writel(l, OTG_CTRL);
383  isp->last_otg_ctrl = l;
384  pr_debug(" --> %s/%s\n", state_name(isp), tag);
385 }
386 
387 static void
388 dump_regs(struct isp1301 *isp, const char *label)
389 {
390 #ifdef DEBUG
391  u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
392  u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
393  u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
394 
395  pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
396  omap_readl(OTG_CTRL), label, state_name(isp),
397  ctrl, status, src);
398  /* mode control and irq enables don't change much */
399 #endif
400 }
401 
402 /*-------------------------------------------------------------------------*/
403 
404 #ifdef CONFIG_USB_OTG
405 
406 /*
407  * The OMAP OTG controller handles most of the OTG state transitions.
408  *
409  * We translate isp1301 outputs (mostly voltage comparator status) into
410  * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
411  * flags into isp1301 inputs ... and infer state transitions.
412  */
413 
414 #ifdef VERBOSE
415 
416 static void check_state(struct isp1301 *isp, const char *tag)
417 {
418  enum usb_otg_state state = OTG_STATE_UNDEFINED;
419  u8 fsm = omap_readw(OTG_TEST) & 0x0ff;
420  unsigned extra = 0;
421 
422  switch (fsm) {
423 
424  /* default-b */
425  case 0x0:
426  state = OTG_STATE_B_IDLE;
427  break;
428  case 0x3:
429  case 0x7:
430  extra = 1;
431  case 0x1:
432  state = OTG_STATE_B_PERIPHERAL;
433  break;
434  case 0x11:
435  state = OTG_STATE_B_SRP_INIT;
436  break;
437 
438  /* extra dual-role default-b states */
439  case 0x12:
440  case 0x13:
441  case 0x16:
442  extra = 1;
443  case 0x17:
444  state = OTG_STATE_B_WAIT_ACON;
445  break;
446  case 0x34:
447  state = OTG_STATE_B_HOST;
448  break;
449 
450  /* default-a */
451  case 0x36:
452  state = OTG_STATE_A_IDLE;
453  break;
454  case 0x3c:
455  state = OTG_STATE_A_WAIT_VFALL;
456  break;
457  case 0x7d:
458  state = OTG_STATE_A_VBUS_ERR;
459  break;
460  case 0x9e:
461  case 0x9f:
462  extra = 1;
463  case 0x89:
464  state = OTG_STATE_A_PERIPHERAL;
465  break;
466  case 0xb7:
467  state = OTG_STATE_A_WAIT_VRISE;
468  break;
469  case 0xb8:
470  state = OTG_STATE_A_WAIT_BCON;
471  break;
472  case 0xb9:
473  state = OTG_STATE_A_HOST;
474  break;
475  case 0xba:
476  state = OTG_STATE_A_SUSPEND;
477  break;
478  default:
479  break;
480  }
481  if (isp->phy.state == state && !extra)
482  return;
483  pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
484  otg_state_string(state), fsm, state_name(isp),
485  omap_readl(OTG_CTRL));
486 }
487 
488 #else
489 
490 static inline void check_state(struct isp1301 *isp, const char *tag) { }
491 
492 #endif
493 
494 /* outputs from ISP1301_INTERRUPT_SOURCE */
495 static void update_otg1(struct isp1301 *isp, u8 int_src)
496 {
497  u32 otg_ctrl;
498 
499  otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
500  otg_ctrl &= ~OTG_XCEIV_INPUTS;
501  otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
502 
503  if (int_src & INTR_SESS_VLD)
504  otg_ctrl |= OTG_ASESSVLD;
505  else if (isp->phy.state == OTG_STATE_A_WAIT_VFALL) {
506  a_idle(isp, "vfall");
507  otg_ctrl &= ~OTG_CTRL_BITS;
508  }
509  if (int_src & INTR_VBUS_VLD)
510  otg_ctrl |= OTG_VBUSVLD;
511  if (int_src & INTR_ID_GND) { /* default-A */
512  if (isp->phy.state == OTG_STATE_B_IDLE
513  || isp->phy.state
514  == OTG_STATE_UNDEFINED) {
515  a_idle(isp, "init");
516  return;
517  }
518  } else { /* default-B */
519  otg_ctrl |= OTG_ID;
520  if (isp->phy.state == OTG_STATE_A_IDLE
521  || isp->phy.state == OTG_STATE_UNDEFINED) {
522  b_idle(isp, "init");
523  return;
524  }
525  }
526  omap_writel(otg_ctrl, OTG_CTRL);
527 }
528 
529 /* outputs from ISP1301_OTG_STATUS */
530 static void update_otg2(struct isp1301 *isp, u8 otg_status)
531 {
532  u32 otg_ctrl;
533 
534  otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
535  otg_ctrl &= ~OTG_XCEIV_INPUTS;
536  otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
537  if (otg_status & OTG_B_SESS_VLD)
538  otg_ctrl |= OTG_BSESSVLD;
539  else if (otg_status & OTG_B_SESS_END)
540  otg_ctrl |= OTG_BSESSEND;
541  omap_writel(otg_ctrl, OTG_CTRL);
542 }
543 
544 /* inputs going to ISP1301 */
545 static void otg_update_isp(struct isp1301 *isp)
546 {
547  u32 otg_ctrl, otg_change;
548  u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
549 
550  otg_ctrl = omap_readl(OTG_CTRL);
551  otg_change = otg_ctrl ^ isp->last_otg_ctrl;
552  isp->last_otg_ctrl = otg_ctrl;
553  otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
554 
555  switch (isp->phy.state) {
556  case OTG_STATE_B_IDLE:
557  case OTG_STATE_B_PERIPHERAL:
558  case OTG_STATE_B_SRP_INIT:
559  if (!(otg_ctrl & OTG_PULLUP)) {
560  // if (otg_ctrl & OTG_B_HNPEN) {
561  if (isp->phy.otg->gadget->b_hnp_enable) {
562  isp->phy.state = OTG_STATE_B_WAIT_ACON;
563  pr_debug(" --> b_wait_acon\n");
564  }
565  goto pulldown;
566  }
567 pullup:
568  set |= OTG1_DP_PULLUP;
569  clr |= OTG1_DP_PULLDOWN;
570  break;
571  case OTG_STATE_A_SUSPEND:
572  case OTG_STATE_A_PERIPHERAL:
573  if (otg_ctrl & OTG_PULLUP)
574  goto pullup;
575  /* FALLTHROUGH */
576  // case OTG_STATE_B_WAIT_ACON:
577  default:
578 pulldown:
579  set |= OTG1_DP_PULLDOWN;
580  clr |= OTG1_DP_PULLUP;
581  break;
582  }
583 
584 # define toggle(OTG,ISP) do { \
585  if (otg_ctrl & OTG) set |= ISP; \
586  else clr |= ISP; \
587  } while (0)
588 
589  if (!(isp->phy.otg->host))
590  otg_ctrl &= ~OTG_DRV_VBUS;
591 
592  switch (isp->phy.state) {
593  case OTG_STATE_A_SUSPEND:
594  if (otg_ctrl & OTG_DRV_VBUS) {
595  set |= OTG1_VBUS_DRV;
596  break;
597  }
598  /* HNP failed for some reason (A_AIDL_BDIS timeout) */
599  notresponding(isp);
600 
601  /* FALLTHROUGH */
602  case OTG_STATE_A_VBUS_ERR:
603  isp->phy.state = OTG_STATE_A_WAIT_VFALL;
604  pr_debug(" --> a_wait_vfall\n");
605  /* FALLTHROUGH */
606  case OTG_STATE_A_WAIT_VFALL:
607  /* FIXME usbcore thinks port power is still on ... */
608  clr |= OTG1_VBUS_DRV;
609  break;
610  case OTG_STATE_A_IDLE:
611  if (otg_ctrl & OTG_DRV_VBUS) {
612  isp->phy.state = OTG_STATE_A_WAIT_VRISE;
613  pr_debug(" --> a_wait_vrise\n");
614  }
615  /* FALLTHROUGH */
616  default:
617  toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
618  }
619 
620  toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
621  toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
622 
623 # undef toggle
624 
625  isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
626  isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
627 
628  /* HNP switch to host or peripheral; and SRP */
629  if (otg_change & OTG_PULLUP) {
630  u32 l;
631 
632  switch (isp->phy.state) {
633  case OTG_STATE_B_IDLE:
634  if (clr & OTG1_DP_PULLUP)
635  break;
636  isp->phy.state = OTG_STATE_B_PERIPHERAL;
637  pr_debug(" --> b_peripheral\n");
638  break;
639  case OTG_STATE_A_SUSPEND:
640  if (clr & OTG1_DP_PULLUP)
641  break;
642  isp->phy.state = OTG_STATE_A_PERIPHERAL;
643  pr_debug(" --> a_peripheral\n");
644  break;
645  default:
646  break;
647  }
648  l = omap_readl(OTG_CTRL);
649  l |= OTG_PULLUP;
650  omap_writel(l, OTG_CTRL);
651  }
652 
653  check_state(isp, __func__);
654  dump_regs(isp, "otg->isp1301");
655 }
656 
657 static irqreturn_t omap_otg_irq(int irq, void *_isp)
658 {
659  u16 otg_irq = omap_readw(OTG_IRQ_SRC);
660  u32 otg_ctrl;
661  int ret = IRQ_NONE;
662  struct isp1301 *isp = _isp;
663  struct usb_otg *otg = isp->phy.otg;
664 
665  /* update ISP1301 transceiver from OTG controller */
666  if (otg_irq & OPRT_CHG) {
667  omap_writew(OPRT_CHG, OTG_IRQ_SRC);
668  isp1301_defer_work(isp, WORK_UPDATE_ISP);
669  ret = IRQ_HANDLED;
670 
671  /* SRP to become b_peripheral failed */
672  } else if (otg_irq & B_SRP_TMROUT) {
673  pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
674  notresponding(isp);
675 
676  /* gadget drivers that care should monitor all kinds of
677  * remote wakeup (SRP, normal) using their own timer
678  * to give "check cable and A-device" messages.
679  */
680  if (isp->phy.state == OTG_STATE_B_SRP_INIT)
681  b_idle(isp, "srp_timeout");
682 
683  omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
684  ret = IRQ_HANDLED;
685 
686  /* HNP to become b_host failed */
687  } else if (otg_irq & B_HNP_FAIL) {
688  pr_debug("otg: %s B_HNP_FAIL, %06x\n",
689  state_name(isp), omap_readl(OTG_CTRL));
690  notresponding(isp);
691 
692  otg_ctrl = omap_readl(OTG_CTRL);
693  otg_ctrl |= OTG_BUSDROP;
694  otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
695  omap_writel(otg_ctrl, OTG_CTRL);
696 
697  /* subset of b_peripheral()... */
698  isp->phy.state = OTG_STATE_B_PERIPHERAL;
699  pr_debug(" --> b_peripheral\n");
700 
701  omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
702  ret = IRQ_HANDLED;
703 
704  /* detect SRP from B-device ... */
705  } else if (otg_irq & A_SRP_DETECT) {
706  pr_debug("otg: %s SRP_DETECT, %06x\n",
707  state_name(isp), omap_readl(OTG_CTRL));
708 
709  isp1301_defer_work(isp, WORK_UPDATE_OTG);
710  switch (isp->phy.state) {
711  case OTG_STATE_A_IDLE:
712  if (!otg->host)
713  break;
714  isp1301_defer_work(isp, WORK_HOST_RESUME);
715  otg_ctrl = omap_readl(OTG_CTRL);
716  otg_ctrl |= OTG_A_BUSREQ;
717  otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
718  & ~OTG_XCEIV_INPUTS
719  & OTG_CTRL_MASK;
720  omap_writel(otg_ctrl, OTG_CTRL);
721  break;
722  default:
723  break;
724  }
725 
726  omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
727  ret = IRQ_HANDLED;
728 
729  /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
730  * we don't track them separately
731  */
732  } else if (otg_irq & A_REQ_TMROUT) {
733  otg_ctrl = omap_readl(OTG_CTRL);
734  pr_info("otg: BCON_TMOUT from %s, %06x\n",
735  state_name(isp), otg_ctrl);
736  notresponding(isp);
737 
738  otg_ctrl |= OTG_BUSDROP;
739  otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
740  omap_writel(otg_ctrl, OTG_CTRL);
741  isp->phy.state = OTG_STATE_A_WAIT_VFALL;
742 
743  omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
744  ret = IRQ_HANDLED;
745 
746  /* A-supplied voltage fell too low; overcurrent */
747  } else if (otg_irq & A_VBUS_ERR) {
748  otg_ctrl = omap_readl(OTG_CTRL);
749  printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
750  state_name(isp), otg_irq, otg_ctrl);
751 
752  otg_ctrl |= OTG_BUSDROP;
753  otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
754  omap_writel(otg_ctrl, OTG_CTRL);
755  isp->phy.state = OTG_STATE_A_VBUS_ERR;
756 
757  omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
758  ret = IRQ_HANDLED;
759 
760  /* switch driver; the transceiver code activates it,
761  * ungating the udc clock or resuming OHCI.
762  */
763  } else if (otg_irq & DRIVER_SWITCH) {
764  int kick = 0;
765 
766  otg_ctrl = omap_readl(OTG_CTRL);
767  printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
768  state_name(isp),
769  (otg_ctrl & OTG_DRIVER_SEL)
770  ? "gadget" : "host",
771  otg_ctrl);
772  isp1301_defer_work(isp, WORK_UPDATE_ISP);
773 
774  /* role is peripheral */
775  if (otg_ctrl & OTG_DRIVER_SEL) {
776  switch (isp->phy.state) {
777  case OTG_STATE_A_IDLE:
778  b_idle(isp, __func__);
779  break;
780  default:
781  break;
782  }
783  isp1301_defer_work(isp, WORK_UPDATE_ISP);
784 
785  /* role is host */
786  } else {
787  if (!(otg_ctrl & OTG_ID)) {
788  otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
789  omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
790  }
791 
792  if (otg->host) {
793  switch (isp->phy.state) {
794  case OTG_STATE_B_WAIT_ACON:
795  isp->phy.state = OTG_STATE_B_HOST;
796  pr_debug(" --> b_host\n");
797  kick = 1;
798  break;
799  case OTG_STATE_A_WAIT_BCON:
800  isp->phy.state = OTG_STATE_A_HOST;
801  pr_debug(" --> a_host\n");
802  break;
803  case OTG_STATE_A_PERIPHERAL:
804  isp->phy.state = OTG_STATE_A_WAIT_BCON;
805  pr_debug(" --> a_wait_bcon\n");
806  break;
807  default:
808  break;
809  }
810  isp1301_defer_work(isp, WORK_HOST_RESUME);
811  }
812  }
813 
814  omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
815  ret = IRQ_HANDLED;
816 
817  if (kick)
818  usb_bus_start_enum(otg->host, otg->host->otg_port);
819  }
820 
821  check_state(isp, __func__);
822  return ret;
823 }
824 
825 static struct platform_device *otg_dev;
826 
827 static int isp1301_otg_init(struct isp1301 *isp)
828 {
829  u32 l;
830 
831  if (!otg_dev)
832  return -ENODEV;
833 
834  dump_regs(isp, __func__);
835  /* some of these values are board-specific... */
836  l = omap_readl(OTG_SYSCON_2);
837  l |= OTG_EN
838  /* for B-device: */
839  | SRP_GPDATA /* 9msec Bdev D+ pulse */
840  | SRP_GPDVBUS /* discharge after VBUS pulse */
841  // | (3 << 24) /* 2msec VBUS pulse */
842  /* for A-device: */
843  | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
844  | SRP_DPW /* detect 167+ns SRP pulses */
845  | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
846  ;
847  omap_writel(l, OTG_SYSCON_2);
848 
849  update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
850  update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
851 
852  check_state(isp, __func__);
853  pr_debug("otg: %s, %s %06x\n",
854  state_name(isp), __func__, omap_readl(OTG_CTRL));
855 
856  omap_writew(DRIVER_SWITCH | OPRT_CHG
857  | B_SRP_TMROUT | B_HNP_FAIL
858  | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
859 
860  l = omap_readl(OTG_SYSCON_2);
861  l |= OTG_EN;
862  omap_writel(l, OTG_SYSCON_2);
863 
864  return 0;
865 }
866 
867 static int otg_probe(struct platform_device *dev)
868 {
869  // struct omap_usb_config *config = dev->platform_data;
870 
871  otg_dev = dev;
872  return 0;
873 }
874 
875 static int otg_remove(struct platform_device *dev)
876 {
877  otg_dev = NULL;
878  return 0;
879 }
880 
881 static struct platform_driver omap_otg_driver = {
882  .probe = otg_probe,
883  .remove = otg_remove,
884  .driver = {
885  .owner = THIS_MODULE,
886  .name = "omap_otg",
887  },
888 };
889 
890 static int otg_bind(struct isp1301 *isp)
891 {
892  int status;
893 
894  if (otg_dev)
895  return -EBUSY;
896 
897  status = platform_driver_register(&omap_otg_driver);
898  if (status < 0)
899  return status;
900 
901  if (otg_dev)
902  status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
903  0, DRIVER_NAME, isp);
904  else
905  status = -ENODEV;
906 
907  if (status < 0)
908  platform_driver_unregister(&omap_otg_driver);
909  return status;
910 }
911 
912 static void otg_unbind(struct isp1301 *isp)
913 {
914  if (!otg_dev)
915  return;
916  free_irq(otg_dev->resource[1].start, isp);
917 }
918 
919 #else
920 
921 /* OTG controller isn't clocked */
922 
923 #endif /* CONFIG_USB_OTG */
924 
925 /*-------------------------------------------------------------------------*/
926 
927 static void b_peripheral(struct isp1301 *isp)
928 {
929  u32 l;
930 
931  l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
932  omap_writel(l, OTG_CTRL);
933 
934  usb_gadget_vbus_connect(isp->phy.otg->gadget);
935 
936 #ifdef CONFIG_USB_OTG
937  enable_vbus_draw(isp, 8);
938  otg_update_isp(isp);
939 #else
940  enable_vbus_draw(isp, 100);
941  /* UDC driver just set OTG_BSESSVLD */
942  isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
943  isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
944  isp->phy.state = OTG_STATE_B_PERIPHERAL;
945  pr_debug(" --> b_peripheral\n");
946  dump_regs(isp, "2periph");
947 #endif
948 }
949 
950 static void isp_update_otg(struct isp1301 *isp, u8 stat)
951 {
952  struct usb_otg *otg = isp->phy.otg;
953  u8 isp_stat, isp_bstat;
954  enum usb_otg_state state = isp->phy.state;
955 
956  if (stat & INTR_BDIS_ACON)
957  pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
958 
959  /* start certain state transitions right away */
960  isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
961  if (isp_stat & INTR_ID_GND) {
962  if (otg->default_a) {
963  switch (state) {
964  case OTG_STATE_B_IDLE:
965  a_idle(isp, "idle");
966  /* FALLTHROUGH */
967  case OTG_STATE_A_IDLE:
968  enable_vbus_source(isp);
969  /* FALLTHROUGH */
970  case OTG_STATE_A_WAIT_VRISE:
971  /* we skip over OTG_STATE_A_WAIT_BCON, since
972  * the HC will transition to A_HOST (or
973  * A_SUSPEND!) without our noticing except
974  * when HNP is used.
975  */
976  if (isp_stat & INTR_VBUS_VLD)
977  isp->phy.state = OTG_STATE_A_HOST;
978  break;
979  case OTG_STATE_A_WAIT_VFALL:
980  if (!(isp_stat & INTR_SESS_VLD))
981  a_idle(isp, "vfell");
982  break;
983  default:
984  if (!(isp_stat & INTR_VBUS_VLD))
985  isp->phy.state = OTG_STATE_A_VBUS_ERR;
986  break;
987  }
988  isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
989  } else {
990  switch (state) {
991  case OTG_STATE_B_PERIPHERAL:
992  case OTG_STATE_B_HOST:
993  case OTG_STATE_B_WAIT_ACON:
994  usb_gadget_vbus_disconnect(otg->gadget);
995  break;
996  default:
997  break;
998  }
999  if (state != OTG_STATE_A_IDLE)
1000  a_idle(isp, "id");
1001  if (otg->host && state == OTG_STATE_A_IDLE)
1002  isp1301_defer_work(isp, WORK_HOST_RESUME);
1003  isp_bstat = 0;
1004  }
1005  } else {
1006  u32 l;
1007 
1008  /* if user unplugged mini-A end of cable,
1009  * don't bypass A_WAIT_VFALL.
1010  */
1011  if (otg->default_a) {
1012  switch (state) {
1013  default:
1014  isp->phy.state = OTG_STATE_A_WAIT_VFALL;
1015  break;
1016  case OTG_STATE_A_WAIT_VFALL:
1017  state = OTG_STATE_A_IDLE;
1018  /* khubd may take a while to notice and
1019  * handle this disconnect, so don't go
1020  * to B_IDLE quite yet.
1021  */
1022  break;
1023  case OTG_STATE_A_IDLE:
1024  host_suspend(isp);
1025  isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1026  MC1_BDIS_ACON_EN);
1027  isp->phy.state = OTG_STATE_B_IDLE;
1028  l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1029  l &= ~OTG_CTRL_BITS;
1030  omap_writel(l, OTG_CTRL);
1031  break;
1032  case OTG_STATE_B_IDLE:
1033  break;
1034  }
1035  }
1036  isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1037 
1038  switch (isp->phy.state) {
1039  case OTG_STATE_B_PERIPHERAL:
1040  case OTG_STATE_B_WAIT_ACON:
1041  case OTG_STATE_B_HOST:
1042  if (likely(isp_bstat & OTG_B_SESS_VLD))
1043  break;
1044  enable_vbus_draw(isp, 0);
1045 #ifndef CONFIG_USB_OTG
1046  /* UDC driver will clear OTG_BSESSVLD */
1047  isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1048  OTG1_DP_PULLDOWN);
1049  isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1050  OTG1_DP_PULLUP);
1051  dump_regs(isp, __func__);
1052 #endif
1053  /* FALLTHROUGH */
1054  case OTG_STATE_B_SRP_INIT:
1055  b_idle(isp, __func__);
1056  l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1057  omap_writel(l, OTG_CTRL);
1058  /* FALLTHROUGH */
1059  case OTG_STATE_B_IDLE:
1060  if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1061 #ifdef CONFIG_USB_OTG
1062  update_otg1(isp, isp_stat);
1063  update_otg2(isp, isp_bstat);
1064 #endif
1065  b_peripheral(isp);
1066  } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1067  isp_bstat |= OTG_B_SESS_END;
1068  break;
1069  case OTG_STATE_A_WAIT_VFALL:
1070  break;
1071  default:
1072  pr_debug("otg: unsupported b-device %s\n",
1073  state_name(isp));
1074  break;
1075  }
1076  }
1077 
1078  if (state != isp->phy.state)
1079  pr_debug(" isp, %s -> %s\n",
1080  otg_state_string(state), state_name(isp));
1081 
1082 #ifdef CONFIG_USB_OTG
1083  /* update the OTG controller state to match the isp1301; may
1084  * trigger OPRT_CHG irqs for changes going to the isp1301.
1085  */
1086  update_otg1(isp, isp_stat);
1087  update_otg2(isp, isp_bstat);
1088  check_state(isp, __func__);
1089 #endif
1090 
1091  dump_regs(isp, "isp1301->otg");
1092 }
1093 
1094 /*-------------------------------------------------------------------------*/
1095 
1096 static u8 isp1301_clear_latch(struct isp1301 *isp)
1097 {
1098  u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1099  isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1100  return latch;
1101 }
1102 
1103 static void
1104 isp1301_work(struct work_struct *work)
1105 {
1106  struct isp1301 *isp = container_of(work, struct isp1301, work);
1107  int stop;
1108 
1109  /* implicit lock: we're the only task using this device */
1110  isp->working = 1;
1111  do {
1112  stop = test_bit(WORK_STOP, &isp->todo);
1113 
1114 #ifdef CONFIG_USB_OTG
1115  /* transfer state from otg engine to isp1301 */
1116  if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1117  otg_update_isp(isp);
1118  put_device(&isp->client->dev);
1119  }
1120 #endif
1121  /* transfer state from isp1301 to otg engine */
1122  if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1123  u8 stat = isp1301_clear_latch(isp);
1124 
1125  isp_update_otg(isp, stat);
1126  put_device(&isp->client->dev);
1127  }
1128 
1129  if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1130  u32 otg_ctrl;
1131 
1132  /*
1133  * skip A_WAIT_VRISE; hc transitions invisibly
1134  * skip A_WAIT_BCON; same.
1135  */
1136  switch (isp->phy.state) {
1137  case OTG_STATE_A_WAIT_BCON:
1138  case OTG_STATE_A_WAIT_VRISE:
1139  isp->phy.state = OTG_STATE_A_HOST;
1140  pr_debug(" --> a_host\n");
1141  otg_ctrl = omap_readl(OTG_CTRL);
1142  otg_ctrl |= OTG_A_BUSREQ;
1143  otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1144  & OTG_CTRL_MASK;
1145  omap_writel(otg_ctrl, OTG_CTRL);
1146  break;
1147  case OTG_STATE_B_WAIT_ACON:
1148  isp->phy.state = OTG_STATE_B_HOST;
1149  pr_debug(" --> b_host (acon)\n");
1150  break;
1151  case OTG_STATE_B_HOST:
1152  case OTG_STATE_B_IDLE:
1153  case OTG_STATE_A_IDLE:
1154  break;
1155  default:
1156  pr_debug(" host resume in %s\n",
1157  state_name(isp));
1158  }
1159  host_resume(isp);
1160  // mdelay(10);
1161  put_device(&isp->client->dev);
1162  }
1163 
1164  if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1165 #ifdef VERBOSE
1166  dump_regs(isp, "timer");
1167  if (!stop)
1168  mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1169 #endif
1170  put_device(&isp->client->dev);
1171  }
1172 
1173  if (isp->todo)
1174  dev_vdbg(&isp->client->dev,
1175  "work done, todo = 0x%lx\n",
1176  isp->todo);
1177  if (stop) {
1178  dev_dbg(&isp->client->dev, "stop\n");
1179  break;
1180  }
1181  } while (isp->todo);
1182  isp->working = 0;
1183 }
1184 
1185 static irqreturn_t isp1301_irq(int irq, void *isp)
1186 {
1187  isp1301_defer_work(isp, WORK_UPDATE_OTG);
1188  return IRQ_HANDLED;
1189 }
1190 
1191 static void isp1301_timer(unsigned long _isp)
1192 {
1193  isp1301_defer_work((void *)_isp, WORK_TIMER);
1194 }
1195 
1196 /*-------------------------------------------------------------------------*/
1197 
1198 static void isp1301_release(struct device *dev)
1199 {
1200  struct isp1301 *isp;
1201 
1202  isp = dev_get_drvdata(dev);
1203 
1204  /* FIXME -- not with a "new style" driver, it doesn't!! */
1205 
1206  /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1207  if (isp->i2c_release)
1208  isp->i2c_release(dev);
1209  kfree(isp->phy.otg);
1210  kfree (isp);
1211 }
1212 
1213 static struct isp1301 *the_transceiver;
1214 
1215 static int __exit isp1301_remove(struct i2c_client *i2c)
1216 {
1217  struct isp1301 *isp;
1218 
1219  isp = i2c_get_clientdata(i2c);
1220 
1221  isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1222  isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1223  free_irq(i2c->irq, isp);
1224 #ifdef CONFIG_USB_OTG
1225  otg_unbind(isp);
1226 #endif
1227  if (machine_is_omap_h2())
1228  gpio_free(2);
1229 
1230  isp->timer.data = 0;
1231  set_bit(WORK_STOP, &isp->todo);
1232  del_timer_sync(&isp->timer);
1233  flush_work(&isp->work);
1234 
1235  put_device(&i2c->dev);
1236  the_transceiver = NULL;
1237 
1238  return 0;
1239 }
1240 
1241 /*-------------------------------------------------------------------------*/
1242 
1243 /* NOTE: three modes are possible here, only one of which
1244  * will be standards-conformant on any given system:
1245  *
1246  * - OTG mode (dual-role), required if there's a Mini-AB connector
1247  * - HOST mode, for when there's one or more A (host) connectors
1248  * - DEVICE mode, for when there's a B/Mini-B (device) connector
1249  *
1250  * As a rule, you won't have an isp1301 chip unless it's there to
1251  * support the OTG mode. Other modes help testing USB controllers
1252  * in isolation from (full) OTG support, or maybe so later board
1253  * revisions can help to support those feature.
1254  */
1255 
1256 #ifdef CONFIG_USB_OTG
1257 
1258 static int isp1301_otg_enable(struct isp1301 *isp)
1259 {
1260  power_up(isp);
1261  isp1301_otg_init(isp);
1262 
1263  /* NOTE: since we don't change this, this provides
1264  * a few more interrupts than are strictly needed.
1265  */
1266  isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1267  INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1268  isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1269  INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1270 
1271  dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1272 
1273  return 0;
1274 }
1275 
1276 #endif
1277 
1278 /* add or disable the host device+driver */
1279 static int
1280 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1281 {
1282  struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1283 
1284  if (!otg || isp != the_transceiver)
1285  return -ENODEV;
1286 
1287  if (!host) {
1288  omap_writew(0, OTG_IRQ_EN);
1289  power_down(isp);
1290  otg->host = NULL;
1291  return 0;
1292  }
1293 
1294 #ifdef CONFIG_USB_OTG
1295  otg->host = host;
1296  dev_dbg(&isp->client->dev, "registered host\n");
1297  host_suspend(isp);
1298  if (otg->gadget)
1299  return isp1301_otg_enable(isp);
1300  return 0;
1301 
1302 #elif !defined(CONFIG_USB_GADGET_OMAP)
1303  // FIXME update its refcount
1304  otg->host = host;
1305 
1306  power_up(isp);
1307 
1308  if (machine_is_omap_h2())
1309  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1310 
1311  dev_info(&isp->client->dev, "A-Host sessions ok\n");
1312  isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1313  INTR_ID_GND);
1314  isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1315  INTR_ID_GND);
1316 
1317  /* If this has a Mini-AB connector, this mode is highly
1318  * nonstandard ... but can be handy for testing, especially with
1319  * the Mini-A end of an OTG cable. (Or something nonstandard
1320  * like MiniB-to-StandardB, maybe built with a gender mender.)
1321  */
1322  isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1323 
1324  dump_regs(isp, __func__);
1325 
1326  return 0;
1327 
1328 #else
1329  dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1330  return -EINVAL;
1331 #endif
1332 
1333 }
1334 
1335 static int
1336 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1337 {
1338  struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1339 
1340  if (!otg || isp != the_transceiver)
1341  return -ENODEV;
1342 
1343  if (!gadget) {
1344  omap_writew(0, OTG_IRQ_EN);
1345  if (!otg->default_a)
1346  enable_vbus_draw(isp, 0);
1347  usb_gadget_vbus_disconnect(otg->gadget);
1348  otg->gadget = NULL;
1349  power_down(isp);
1350  return 0;
1351  }
1352 
1353 #ifdef CONFIG_USB_OTG
1354  otg->gadget = gadget;
1355  dev_dbg(&isp->client->dev, "registered gadget\n");
1356  /* gadget driver may be suspended until vbus_connect () */
1357  if (otg->host)
1358  return isp1301_otg_enable(isp);
1359  return 0;
1360 
1361 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1362  otg->gadget = gadget;
1363  // FIXME update its refcount
1364 
1365  {
1366  u32 l;
1367 
1368  l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1369  l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1370  l |= OTG_ID;
1371  omap_writel(l, OTG_CTRL);
1372  }
1373 
1374  power_up(isp);
1375  isp->phy.state = OTG_STATE_B_IDLE;
1376 
1377  if (machine_is_omap_h2() || machine_is_omap_h3())
1378  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1379 
1380  isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1381  INTR_SESS_VLD);
1382  isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1383  INTR_VBUS_VLD);
1384  dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1385  dump_regs(isp, __func__);
1386 
1387  /* If this has a Mini-AB connector, this mode is highly
1388  * nonstandard ... but can be handy for testing, so long
1389  * as you don't plug a Mini-A cable into the jack.
1390  */
1391  if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1392  b_peripheral(isp);
1393 
1394  return 0;
1395 
1396 #else
1397  dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1398  return -EINVAL;
1399 #endif
1400 }
1401 
1402 
1403 /*-------------------------------------------------------------------------*/
1404 
1405 static int
1406 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1407 {
1408  if (!the_transceiver)
1409  return -ENODEV;
1410  if (dev->state == OTG_STATE_B_PERIPHERAL)
1411  enable_vbus_draw(the_transceiver, mA);
1412  return 0;
1413 }
1414 
1415 static int
1416 isp1301_start_srp(struct usb_otg *otg)
1417 {
1418  struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1419  u32 otg_ctrl;
1420 
1421  if (!otg || isp != the_transceiver
1422  || isp->phy.state != OTG_STATE_B_IDLE)
1423  return -ENODEV;
1424 
1425  otg_ctrl = omap_readl(OTG_CTRL);
1426  if (!(otg_ctrl & OTG_BSESSEND))
1427  return -EINVAL;
1428 
1429  otg_ctrl |= OTG_B_BUSREQ;
1430  otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1431  omap_writel(otg_ctrl, OTG_CTRL);
1432  isp->phy.state = OTG_STATE_B_SRP_INIT;
1433 
1434  pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1435  omap_readl(OTG_CTRL));
1436 #ifdef CONFIG_USB_OTG
1437  check_state(isp, __func__);
1438 #endif
1439  return 0;
1440 }
1441 
1442 static int
1443 isp1301_start_hnp(struct usb_otg *otg)
1444 {
1445 #ifdef CONFIG_USB_OTG
1446  struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1447  u32 l;
1448 
1449  if (!otg || isp != the_transceiver)
1450  return -ENODEV;
1451  if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1452  return -ENOTCONN;
1453  if (!otg->default_a && (otg->gadget == NULL
1454  || !otg->gadget->b_hnp_enable))
1455  return -ENOTCONN;
1456 
1457  /* We want hardware to manage most HNP protocol timings.
1458  * So do this part as early as possible...
1459  */
1460  switch (isp->phy.state) {
1461  case OTG_STATE_B_HOST:
1462  isp->phy.state = OTG_STATE_B_PERIPHERAL;
1463  /* caller will suspend next */
1464  break;
1465  case OTG_STATE_A_HOST:
1466 #if 0
1467  /* autoconnect mode avoids irq latency bugs */
1468  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1469  MC1_BDIS_ACON_EN);
1470 #endif
1471  /* caller must suspend then clear A_BUSREQ */
1472  usb_gadget_vbus_connect(otg->gadget);
1473  l = omap_readl(OTG_CTRL);
1474  l |= OTG_A_SETB_HNPEN;
1475  omap_writel(l, OTG_CTRL);
1476 
1477  break;
1478  case OTG_STATE_A_PERIPHERAL:
1479  /* initiated by B-Host suspend */
1480  break;
1481  default:
1482  return -EILSEQ;
1483  }
1484  pr_debug("otg: HNP %s, %06x ...\n",
1485  state_name(isp), omap_readl(OTG_CTRL));
1486  check_state(isp, __func__);
1487  return 0;
1488 #else
1489  /* srp-only */
1490  return -EINVAL;
1491 #endif
1492 }
1493 
1494 /*-------------------------------------------------------------------------*/
1495 
1496 static int __devinit
1497 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1498 {
1499  int status;
1500  struct isp1301 *isp;
1501 
1502  if (the_transceiver)
1503  return 0;
1504 
1505  isp = kzalloc(sizeof *isp, GFP_KERNEL);
1506  if (!isp)
1507  return 0;
1508 
1509  isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1510  if (!isp->phy.otg) {
1511  kfree(isp);
1512  return 0;
1513  }
1514 
1515  INIT_WORK(&isp->work, isp1301_work);
1516  init_timer(&isp->timer);
1517  isp->timer.function = isp1301_timer;
1518  isp->timer.data = (unsigned long) isp;
1519 
1520  i2c_set_clientdata(i2c, isp);
1521  isp->client = i2c;
1522 
1523  /* verify the chip (shouldn't be necessary) */
1524  status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1525  if (status != I2C_VENDOR_ID_PHILIPS) {
1526  dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1527  goto fail;
1528  }
1529  status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1530  if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1531  dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1532  goto fail;
1533  }
1534  isp->i2c_release = i2c->dev.release;
1535  i2c->dev.release = isp1301_release;
1536 
1537  /* initial development used chiprev 2.00 */
1538  status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1539  dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1540  status >> 8, status & 0xff);
1541 
1542  /* make like power-on reset */
1543  isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1544 
1545  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1546  isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1547 
1548  isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1549  OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1550  isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1551  ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1552 
1553  isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1554  isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1555  isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1556 
1557 #ifdef CONFIG_USB_OTG
1558  status = otg_bind(isp);
1559  if (status < 0) {
1560  dev_dbg(&i2c->dev, "can't bind OTG\n");
1561  goto fail;
1562  }
1563 #endif
1564 
1565  if (machine_is_omap_h2()) {
1566  /* full speed signaling by default */
1567  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1568  MC1_SPEED);
1569  isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1570  MC2_SPD_SUSP_CTRL);
1571 
1572  /* IRQ wired at M14 */
1573  omap_cfg_reg(M14_1510_GPIO2);
1574  if (gpio_request(2, "isp1301") == 0)
1575  gpio_direction_input(2);
1576  isp->irq_type = IRQF_TRIGGER_FALLING;
1577  }
1578 
1579  status = request_irq(i2c->irq, isp1301_irq,
1580  isp->irq_type, DRIVER_NAME, isp);
1581  if (status < 0) {
1582  dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1583  i2c->irq, status);
1584  goto fail;
1585  }
1586 
1587  isp->phy.dev = &i2c->dev;
1588  isp->phy.label = DRIVER_NAME;
1589  isp->phy.set_power = isp1301_set_power,
1590 
1591  isp->phy.otg->phy = &isp->phy;
1592  isp->phy.otg->set_host = isp1301_set_host,
1593  isp->phy.otg->set_peripheral = isp1301_set_peripheral,
1594  isp->phy.otg->start_srp = isp1301_start_srp,
1595  isp->phy.otg->start_hnp = isp1301_start_hnp,
1596 
1597  enable_vbus_draw(isp, 0);
1598  power_down(isp);
1599  the_transceiver = isp;
1600 
1601 #ifdef CONFIG_USB_OTG
1602  update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1603  update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1604 #endif
1605 
1606  dump_regs(isp, __func__);
1607 
1608 #ifdef VERBOSE
1609  mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1610  dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1611 #endif
1612 
1613  status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1614  if (status < 0)
1615  dev_err(&i2c->dev, "can't register transceiver, %d\n",
1616  status);
1617 
1618  return 0;
1619 
1620 fail:
1621  kfree(isp->phy.otg);
1622  kfree(isp);
1623  return -ENODEV;
1624 }
1625 
1626 static const struct i2c_device_id isp1301_id[] = {
1627  { "isp1301_omap", 0 },
1628  { }
1629 };
1630 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1631 
1632 static struct i2c_driver isp1301_driver = {
1633  .driver = {
1634  .name = "isp1301_omap",
1635  },
1636  .probe = isp1301_probe,
1637  .remove = __exit_p(isp1301_remove),
1638  .id_table = isp1301_id,
1639 };
1640 
1641 /*-------------------------------------------------------------------------*/
1642 
1643 static int __init isp_init(void)
1644 {
1645  return i2c_add_driver(&isp1301_driver);
1646 }
1647 subsys_initcall(isp_init);
1648 
1649 static void __exit isp_exit(void)
1650 {
1651  if (the_transceiver)
1652  usb_remove_phy(&the_transceiver->phy);
1653  i2c_del_driver(&isp1301_driver);
1654 }
1655 module_exit(isp_exit);
1656 
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