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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MUSB OTG driver virtual root hub support
4 *
5 * Copyright 2005 Mentor Graphics Corporation
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/timer.h>
16
17#include <asm/unaligned.h>
18
19#include "musb_core.h"
20
21void musb_host_finish_resume(struct work_struct *work)
22{
23 struct musb *musb;
24 unsigned long flags;
25 u8 power;
26
27 musb = container_of(work, struct musb, finish_resume_work.work);
28
29 spin_lock_irqsave(&musb->lock, flags);
30
31 power = musb_readb(musb->mregs, MUSB_POWER);
32 power &= ~MUSB_POWER_RESUME;
33 musb_dbg(musb, "root port resume stopped, power %02x", power);
34 musb_writeb(musb->mregs, MUSB_POWER, power);
35
36 /*
37 * ISSUE: DaVinci (RTL 1.300) disconnects after
38 * resume of high speed peripherals (but not full
39 * speed ones).
40 */
41 musb->is_active = 1;
42 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
43 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
44 usb_hcd_poll_rh_status(musb->hcd);
45 /* NOTE: it might really be A_WAIT_BCON ... */
46 musb->xceiv->otg->state = OTG_STATE_A_HOST;
47
48 spin_unlock_irqrestore(&musb->lock, flags);
49}
50
51int musb_port_suspend(struct musb *musb, bool do_suspend)
52{
53 struct usb_otg *otg = musb->xceiv->otg;
54 u8 power;
55 void __iomem *mbase = musb->mregs;
56
57 if (!is_host_active(musb))
58 return 0;
59
60 /* NOTE: this doesn't necessarily put PHY into low power mode,
61 * turning off its clock; that's a function of PHY integration and
62 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
63 * SE0 changing to connect (J) or wakeup (K) states.
64 */
65 power = musb_readb(mbase, MUSB_POWER);
66 if (do_suspend) {
67 int retries = 10000;
68
69 if (power & MUSB_POWER_RESUME)
70 return -EBUSY;
71
72 if (!(power & MUSB_POWER_SUSPENDM)) {
73 power |= MUSB_POWER_SUSPENDM;
74 musb_writeb(mbase, MUSB_POWER, power);
75
76 /* Needed for OPT A tests */
77 power = musb_readb(mbase, MUSB_POWER);
78 while (power & MUSB_POWER_SUSPENDM) {
79 power = musb_readb(mbase, MUSB_POWER);
80 if (retries-- < 1)
81 break;
82 }
83 }
84
85 musb_dbg(musb, "Root port suspended, power %02x", power);
86
87 musb->port1_status |= USB_PORT_STAT_SUSPEND;
88 switch (musb->xceiv->otg->state) {
89 case OTG_STATE_A_HOST:
90 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
91 musb->is_active = otg->host->b_hnp_enable;
92 if (musb->is_active)
93 mod_timer(&musb->otg_timer, jiffies
94 + msecs_to_jiffies(
95 OTG_TIME_A_AIDL_BDIS));
96 musb_platform_try_idle(musb, 0);
97 break;
98 case OTG_STATE_B_HOST:
99 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
100 musb->is_active = otg->host->b_hnp_enable;
101 musb_platform_try_idle(musb, 0);
102 break;
103 default:
104 musb_dbg(musb, "bogus rh suspend? %s",
105 usb_otg_state_string(musb->xceiv->otg->state));
106 }
107 } else if (power & MUSB_POWER_SUSPENDM) {
108 power &= ~MUSB_POWER_SUSPENDM;
109 power |= MUSB_POWER_RESUME;
110 musb_writeb(mbase, MUSB_POWER, power);
111
112 musb_dbg(musb, "Root port resuming, power %02x", power);
113
114 musb->port1_status |= MUSB_PORT_STAT_RESUME;
115 schedule_delayed_work(&musb->finish_resume_work,
116 msecs_to_jiffies(USB_RESUME_TIMEOUT));
117 }
118 return 0;
119}
120
121void musb_port_reset(struct musb *musb, bool do_reset)
122{
123 u8 power;
124 void __iomem *mbase = musb->mregs;
125
126 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
127 musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
128 musb->port1_status &= ~USB_PORT_STAT_RESET;
129 return;
130 }
131
132 if (!is_host_active(musb))
133 return;
134
135 /* NOTE: caller guarantees it will turn off the reset when
136 * the appropriate amount of time has passed
137 */
138 power = musb_readb(mbase, MUSB_POWER);
139 if (do_reset) {
140 /*
141 * If RESUME is set, we must make sure it stays minimum 20 ms.
142 * Then we must clear RESUME and wait a bit to let musb start
143 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
144 * fail with "Error! Did not receive an SOF before suspend
145 * detected".
146 */
147 if (power & MUSB_POWER_RESUME) {
148 long remain = (unsigned long) musb->rh_timer - jiffies;
149
150 if (musb->rh_timer > 0 && remain > 0) {
151 /* take into account the minimum delay after resume */
152 schedule_delayed_work(
153 &musb->deassert_reset_work, remain);
154 return;
155 }
156
157 musb_writeb(mbase, MUSB_POWER,
158 power & ~MUSB_POWER_RESUME);
159
160 /* Give the core 1 ms to clear MUSB_POWER_RESUME */
161 schedule_delayed_work(&musb->deassert_reset_work,
162 msecs_to_jiffies(1));
163 return;
164 }
165
166 power &= 0xf0;
167 musb_writeb(mbase, MUSB_POWER,
168 power | MUSB_POWER_RESET);
169
170 musb->port1_status |= USB_PORT_STAT_RESET;
171 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
172 schedule_delayed_work(&musb->deassert_reset_work,
173 msecs_to_jiffies(50));
174 } else {
175 musb_dbg(musb, "root port reset stopped");
176 musb_platform_pre_root_reset_end(musb);
177 musb_writeb(mbase, MUSB_POWER,
178 power & ~MUSB_POWER_RESET);
179 musb_platform_post_root_reset_end(musb);
180
181 power = musb_readb(mbase, MUSB_POWER);
182 if (power & MUSB_POWER_HSMODE) {
183 musb_dbg(musb, "high-speed device connected");
184 musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
185 }
186
187 musb->port1_status &= ~USB_PORT_STAT_RESET;
188 musb->port1_status |= USB_PORT_STAT_ENABLE
189 | (USB_PORT_STAT_C_RESET << 16)
190 | (USB_PORT_STAT_C_ENABLE << 16);
191 usb_hcd_poll_rh_status(musb->hcd);
192
193 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
194 }
195}
196
197void musb_root_disconnect(struct musb *musb)
198{
199 struct usb_otg *otg = musb->xceiv->otg;
200
201 musb->port1_status = USB_PORT_STAT_POWER
202 | (USB_PORT_STAT_C_CONNECTION << 16);
203
204 usb_hcd_poll_rh_status(musb->hcd);
205 musb->is_active = 0;
206
207 switch (musb->xceiv->otg->state) {
208 case OTG_STATE_A_SUSPEND:
209 if (otg->host->b_hnp_enable) {
210 musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
211 musb->g.is_a_peripheral = 1;
212 break;
213 }
214 fallthrough;
215 case OTG_STATE_A_HOST:
216 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
217 musb->is_active = 0;
218 break;
219 case OTG_STATE_A_WAIT_VFALL:
220 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
221 break;
222 default:
223 musb_dbg(musb, "host disconnect (%s)",
224 usb_otg_state_string(musb->xceiv->otg->state));
225 }
226}
227EXPORT_SYMBOL_GPL(musb_root_disconnect);
228
229
230/*---------------------------------------------------------------------*/
231
232/* Caller may or may not hold musb->lock */
233int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
234{
235 struct musb *musb = hcd_to_musb(hcd);
236 int retval = 0;
237
238 /* called in_irq() via usb_hcd_poll_rh_status() */
239 if (musb->port1_status & 0xffff0000) {
240 *buf = 0x02;
241 retval = 1;
242 }
243 return retval;
244}
245
246static int musb_has_gadget(struct musb *musb)
247{
248 /*
249 * In host-only mode we start a connection right away. In OTG mode
250 * we have to wait until we loaded a gadget. We don't really need a
251 * gadget if we operate as a host but we should not start a session
252 * as a device without a gadget or else we explode.
253 */
254#ifdef CONFIG_USB_MUSB_HOST
255 return 1;
256#else
257 return musb->port_mode == MUSB_HOST;
258#endif
259}
260
261int musb_hub_control(
262 struct usb_hcd *hcd,
263 u16 typeReq,
264 u16 wValue,
265 u16 wIndex,
266 char *buf,
267 u16 wLength)
268{
269 struct musb *musb = hcd_to_musb(hcd);
270 u32 temp;
271 int retval = 0;
272 unsigned long flags;
273 bool start_musb = false;
274
275 spin_lock_irqsave(&musb->lock, flags);
276
277 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
278 spin_unlock_irqrestore(&musb->lock, flags);
279 return -ESHUTDOWN;
280 }
281
282 /* hub features: always zero, setting is a NOP
283 * port features: reported, sometimes updated when host is active
284 * no indicators
285 */
286 switch (typeReq) {
287 case ClearHubFeature:
288 case SetHubFeature:
289 switch (wValue) {
290 case C_HUB_OVER_CURRENT:
291 case C_HUB_LOCAL_POWER:
292 break;
293 default:
294 goto error;
295 }
296 break;
297 case ClearPortFeature:
298 if ((wIndex & 0xff) != 1)
299 goto error;
300
301 switch (wValue) {
302 case USB_PORT_FEAT_ENABLE:
303 break;
304 case USB_PORT_FEAT_SUSPEND:
305 musb_port_suspend(musb, false);
306 break;
307 case USB_PORT_FEAT_POWER:
308 if (!hcd->self.is_b_host)
309 musb_platform_set_vbus(musb, 0);
310 break;
311 case USB_PORT_FEAT_C_CONNECTION:
312 case USB_PORT_FEAT_C_ENABLE:
313 case USB_PORT_FEAT_C_OVER_CURRENT:
314 case USB_PORT_FEAT_C_RESET:
315 case USB_PORT_FEAT_C_SUSPEND:
316 break;
317 default:
318 goto error;
319 }
320 musb_dbg(musb, "clear feature %d", wValue);
321 musb->port1_status &= ~(1 << wValue);
322 break;
323 case GetHubDescriptor:
324 {
325 struct usb_hub_descriptor *desc = (void *)buf;
326
327 desc->bDescLength = 9;
328 desc->bDescriptorType = USB_DT_HUB;
329 desc->bNbrPorts = 1;
330 desc->wHubCharacteristics = cpu_to_le16(
331 HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
332 | HUB_CHAR_NO_OCPM /* no overcurrent reporting */
333 );
334 desc->bPwrOn2PwrGood = 5; /* msec/2 */
335 desc->bHubContrCurrent = 0;
336
337 /* workaround bogus struct definition */
338 desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
339 desc->u.hs.DeviceRemovable[1] = 0xff;
340 }
341 break;
342 case GetHubStatus:
343 temp = 0;
344 *(__le32 *) buf = cpu_to_le32(temp);
345 break;
346 case GetPortStatus:
347 if (wIndex != 1)
348 goto error;
349
350 put_unaligned(cpu_to_le32(musb->port1_status
351 & ~MUSB_PORT_STAT_RESUME),
352 (__le32 *) buf);
353
354 /* port change status is more interesting */
355 musb_dbg(musb, "port status %08x", musb->port1_status);
356 break;
357 case SetPortFeature:
358 if ((wIndex & 0xff) != 1)
359 goto error;
360
361 switch (wValue) {
362 case USB_PORT_FEAT_POWER:
363 /* NOTE: this controller has a strange state machine
364 * that involves "requesting sessions" according to
365 * magic side effects from incompletely-described
366 * rules about startup...
367 *
368 * This call is what really starts the host mode; be
369 * very careful about side effects if you reorder any
370 * initialization logic, e.g. for OTG, or change any
371 * logic relating to VBUS power-up.
372 */
373 if (!hcd->self.is_b_host && musb_has_gadget(musb))
374 start_musb = true;
375 break;
376 case USB_PORT_FEAT_RESET:
377 musb_port_reset(musb, true);
378 break;
379 case USB_PORT_FEAT_SUSPEND:
380 musb_port_suspend(musb, true);
381 break;
382 case USB_PORT_FEAT_TEST:
383 if (unlikely(is_host_active(musb)))
384 goto error;
385
386 wIndex >>= 8;
387 switch (wIndex) {
388 case USB_TEST_J:
389 pr_debug("USB_TEST_J\n");
390 temp = MUSB_TEST_J;
391 break;
392 case USB_TEST_K:
393 pr_debug("USB_TEST_K\n");
394 temp = MUSB_TEST_K;
395 break;
396 case USB_TEST_SE0_NAK:
397 pr_debug("USB_TEST_SE0_NAK\n");
398 temp = MUSB_TEST_SE0_NAK;
399 break;
400 case USB_TEST_PACKET:
401 pr_debug("USB_TEST_PACKET\n");
402 temp = MUSB_TEST_PACKET;
403 musb_load_testpacket(musb);
404 break;
405 case USB_TEST_FORCE_ENABLE:
406 pr_debug("USB_TEST_FORCE_ENABLE\n");
407 temp = MUSB_TEST_FORCE_HOST
408 | MUSB_TEST_FORCE_HS;
409
410 musb_writeb(musb->mregs, MUSB_DEVCTL,
411 MUSB_DEVCTL_SESSION);
412 break;
413 case 6:
414 pr_debug("TEST_FIFO_ACCESS\n");
415 temp = MUSB_TEST_FIFO_ACCESS;
416 break;
417 default:
418 goto error;
419 }
420 musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
421 break;
422 default:
423 goto error;
424 }
425 musb_dbg(musb, "set feature %d", wValue);
426 musb->port1_status |= 1 << wValue;
427 break;
428
429 default:
430error:
431 /* "protocol stall" on error */
432 retval = -EPIPE;
433 }
434 spin_unlock_irqrestore(&musb->lock, flags);
435
436 if (start_musb)
437 musb_start(musb);
438
439 return retval;
440}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MUSB OTG driver virtual root hub support
4 *
5 * Copyright 2005 Mentor Graphics Corporation
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/timer.h>
16
17#include <asm/unaligned.h>
18
19#include "musb_core.h"
20
21void musb_host_finish_resume(struct work_struct *work)
22{
23 struct musb *musb;
24 unsigned long flags;
25 u8 power;
26
27 musb = container_of(work, struct musb, finish_resume_work.work);
28
29 spin_lock_irqsave(&musb->lock, flags);
30
31 power = musb_readb(musb->mregs, MUSB_POWER);
32 power &= ~MUSB_POWER_RESUME;
33 musb_dbg(musb, "root port resume stopped, power %02x", power);
34 musb_writeb(musb->mregs, MUSB_POWER, power);
35
36 /*
37 * ISSUE: DaVinci (RTL 1.300) disconnects after
38 * resume of high speed peripherals (but not full
39 * speed ones).
40 */
41 musb->is_active = 1;
42 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
43 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
44 usb_hcd_poll_rh_status(musb->hcd);
45 /* NOTE: it might really be A_WAIT_BCON ... */
46 musb_set_state(musb, OTG_STATE_A_HOST);
47
48 spin_unlock_irqrestore(&musb->lock, flags);
49}
50
51int musb_port_suspend(struct musb *musb, bool do_suspend)
52{
53 u8 power;
54 void __iomem *mbase = musb->mregs;
55
56 if (!is_host_active(musb))
57 return 0;
58
59 /* NOTE: this doesn't necessarily put PHY into low power mode,
60 * turning off its clock; that's a function of PHY integration and
61 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
62 * SE0 changing to connect (J) or wakeup (K) states.
63 */
64 power = musb_readb(mbase, MUSB_POWER);
65 if (do_suspend) {
66 int retries = 10000;
67
68 if (power & MUSB_POWER_RESUME)
69 return -EBUSY;
70
71 if (!(power & MUSB_POWER_SUSPENDM)) {
72 power |= MUSB_POWER_SUSPENDM;
73 musb_writeb(mbase, MUSB_POWER, power);
74
75 /* Needed for OPT A tests */
76 power = musb_readb(mbase, MUSB_POWER);
77 while (power & MUSB_POWER_SUSPENDM) {
78 power = musb_readb(mbase, MUSB_POWER);
79 if (retries-- < 1)
80 break;
81 }
82 }
83
84 musb_dbg(musb, "Root port suspended, power %02x", power);
85
86 musb->port1_status |= USB_PORT_STAT_SUSPEND;
87 switch (musb_get_state(musb)) {
88 case OTG_STATE_A_HOST:
89 musb_set_state(musb, OTG_STATE_A_SUSPEND);
90 musb->is_active = musb->xceiv &&
91 musb->xceiv->otg->host->b_hnp_enable;
92 if (musb->is_active)
93 mod_timer(&musb->otg_timer, jiffies
94 + msecs_to_jiffies(
95 OTG_TIME_A_AIDL_BDIS));
96 musb_platform_try_idle(musb, 0);
97 break;
98 case OTG_STATE_B_HOST:
99 musb_set_state(musb, OTG_STATE_B_WAIT_ACON);
100 musb->is_active = musb->xceiv &&
101 musb->xceiv->otg->host->b_hnp_enable;
102 musb_platform_try_idle(musb, 0);
103 break;
104 default:
105 musb_dbg(musb, "bogus rh suspend? %s",
106 musb_otg_state_string(musb));
107 }
108 } else if (power & MUSB_POWER_SUSPENDM) {
109 power &= ~MUSB_POWER_SUSPENDM;
110 power |= MUSB_POWER_RESUME;
111 musb_writeb(mbase, MUSB_POWER, power);
112
113 musb_dbg(musb, "Root port resuming, power %02x", power);
114
115 musb->port1_status |= MUSB_PORT_STAT_RESUME;
116 schedule_delayed_work(&musb->finish_resume_work,
117 msecs_to_jiffies(USB_RESUME_TIMEOUT));
118 }
119 return 0;
120}
121
122void musb_port_reset(struct musb *musb, bool do_reset)
123{
124 u8 power;
125 void __iomem *mbase = musb->mregs;
126
127 if (musb_get_state(musb) == OTG_STATE_B_IDLE) {
128 musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
129 musb->port1_status &= ~USB_PORT_STAT_RESET;
130 return;
131 }
132
133 if (!is_host_active(musb))
134 return;
135
136 /* NOTE: caller guarantees it will turn off the reset when
137 * the appropriate amount of time has passed
138 */
139 power = musb_readb(mbase, MUSB_POWER);
140 if (do_reset) {
141 /*
142 * If RESUME is set, we must make sure it stays minimum 20 ms.
143 * Then we must clear RESUME and wait a bit to let musb start
144 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
145 * fail with "Error! Did not receive an SOF before suspend
146 * detected".
147 */
148 if (power & MUSB_POWER_RESUME) {
149 long remain = (unsigned long) musb->rh_timer - jiffies;
150
151 if (musb->rh_timer > 0 && remain > 0) {
152 /* take into account the minimum delay after resume */
153 schedule_delayed_work(
154 &musb->deassert_reset_work, remain);
155 return;
156 }
157
158 musb_writeb(mbase, MUSB_POWER,
159 power & ~MUSB_POWER_RESUME);
160
161 /* Give the core 1 ms to clear MUSB_POWER_RESUME */
162 schedule_delayed_work(&musb->deassert_reset_work,
163 msecs_to_jiffies(1));
164 return;
165 }
166
167 power &= 0xf0;
168 musb_writeb(mbase, MUSB_POWER,
169 power | MUSB_POWER_RESET);
170
171 musb->port1_status |= USB_PORT_STAT_RESET;
172 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
173 schedule_delayed_work(&musb->deassert_reset_work,
174 msecs_to_jiffies(50));
175 } else {
176 musb_dbg(musb, "root port reset stopped");
177 musb_platform_pre_root_reset_end(musb);
178 musb_writeb(mbase, MUSB_POWER,
179 power & ~MUSB_POWER_RESET);
180 musb_platform_post_root_reset_end(musb);
181
182 power = musb_readb(mbase, MUSB_POWER);
183 if (power & MUSB_POWER_HSMODE) {
184 musb_dbg(musb, "high-speed device connected");
185 musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
186 }
187
188 musb->port1_status &= ~USB_PORT_STAT_RESET;
189 musb->port1_status |= USB_PORT_STAT_ENABLE
190 | (USB_PORT_STAT_C_RESET << 16)
191 | (USB_PORT_STAT_C_ENABLE << 16);
192 usb_hcd_poll_rh_status(musb->hcd);
193
194 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
195 }
196}
197
198void musb_root_disconnect(struct musb *musb)
199{
200 musb->port1_status = USB_PORT_STAT_POWER
201 | (USB_PORT_STAT_C_CONNECTION << 16);
202
203 usb_hcd_poll_rh_status(musb->hcd);
204 musb->is_active = 0;
205
206 switch (musb_get_state(musb)) {
207 case OTG_STATE_A_SUSPEND:
208 if (musb->xceiv && musb->xceiv->otg->host->b_hnp_enable) {
209 musb_set_state(musb, OTG_STATE_A_PERIPHERAL);
210 musb->g.is_a_peripheral = 1;
211 break;
212 }
213 fallthrough;
214 case OTG_STATE_A_HOST:
215 musb_set_state(musb, OTG_STATE_A_WAIT_BCON);
216 musb->is_active = 0;
217 break;
218 case OTG_STATE_A_WAIT_VFALL:
219 musb_set_state(musb, OTG_STATE_B_IDLE);
220 break;
221 default:
222 musb_dbg(musb, "host disconnect (%s)",
223 musb_otg_state_string(musb));
224 }
225}
226EXPORT_SYMBOL_GPL(musb_root_disconnect);
227
228
229/*---------------------------------------------------------------------*/
230
231/* Caller may or may not hold musb->lock */
232int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
233{
234 struct musb *musb = hcd_to_musb(hcd);
235 int retval = 0;
236
237 /* called in_irq() via usb_hcd_poll_rh_status() */
238 if (musb->port1_status & 0xffff0000) {
239 *buf = 0x02;
240 retval = 1;
241 }
242 return retval;
243}
244
245static int musb_has_gadget(struct musb *musb)
246{
247 /*
248 * In host-only mode we start a connection right away. In OTG mode
249 * we have to wait until we loaded a gadget. We don't really need a
250 * gadget if we operate as a host but we should not start a session
251 * as a device without a gadget or else we explode.
252 */
253#ifdef CONFIG_USB_MUSB_HOST
254 return 1;
255#else
256 return musb->port_mode == MUSB_HOST;
257#endif
258}
259
260int musb_hub_control(
261 struct usb_hcd *hcd,
262 u16 typeReq,
263 u16 wValue,
264 u16 wIndex,
265 char *buf,
266 u16 wLength)
267{
268 struct musb *musb = hcd_to_musb(hcd);
269 u32 temp;
270 int retval = 0;
271 unsigned long flags;
272 bool start_musb = false;
273
274 spin_lock_irqsave(&musb->lock, flags);
275
276 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
277 spin_unlock_irqrestore(&musb->lock, flags);
278 return -ESHUTDOWN;
279 }
280
281 /* hub features: always zero, setting is a NOP
282 * port features: reported, sometimes updated when host is active
283 * no indicators
284 */
285 switch (typeReq) {
286 case ClearHubFeature:
287 case SetHubFeature:
288 switch (wValue) {
289 case C_HUB_OVER_CURRENT:
290 case C_HUB_LOCAL_POWER:
291 break;
292 default:
293 goto error;
294 }
295 break;
296 case ClearPortFeature:
297 if ((wIndex & 0xff) != 1)
298 goto error;
299
300 switch (wValue) {
301 case USB_PORT_FEAT_ENABLE:
302 break;
303 case USB_PORT_FEAT_SUSPEND:
304 musb_port_suspend(musb, false);
305 break;
306 case USB_PORT_FEAT_POWER:
307 if (!hcd->self.is_b_host)
308 musb_platform_set_vbus(musb, 0);
309 break;
310 case USB_PORT_FEAT_C_CONNECTION:
311 case USB_PORT_FEAT_C_ENABLE:
312 case USB_PORT_FEAT_C_OVER_CURRENT:
313 case USB_PORT_FEAT_C_RESET:
314 case USB_PORT_FEAT_C_SUSPEND:
315 break;
316 default:
317 goto error;
318 }
319 musb_dbg(musb, "clear feature %d", wValue);
320 musb->port1_status &= ~(1 << wValue);
321 break;
322 case GetHubDescriptor:
323 {
324 struct usb_hub_descriptor *desc = (void *)buf;
325
326 desc->bDescLength = 9;
327 desc->bDescriptorType = USB_DT_HUB;
328 desc->bNbrPorts = 1;
329 desc->wHubCharacteristics = cpu_to_le16(
330 HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
331 | HUB_CHAR_NO_OCPM /* no overcurrent reporting */
332 );
333 desc->bPwrOn2PwrGood = 5; /* msec/2 */
334 desc->bHubContrCurrent = 0;
335
336 /* workaround bogus struct definition */
337 desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
338 desc->u.hs.DeviceRemovable[1] = 0xff;
339 }
340 break;
341 case GetHubStatus:
342 temp = 0;
343 *(__le32 *) buf = cpu_to_le32(temp);
344 break;
345 case GetPortStatus:
346 if (wIndex != 1)
347 goto error;
348
349 put_unaligned(cpu_to_le32(musb->port1_status
350 & ~MUSB_PORT_STAT_RESUME),
351 (__le32 *) buf);
352
353 /* port change status is more interesting */
354 musb_dbg(musb, "port status %08x", musb->port1_status);
355 break;
356 case SetPortFeature:
357 if ((wIndex & 0xff) != 1)
358 goto error;
359
360 switch (wValue) {
361 case USB_PORT_FEAT_POWER:
362 /* NOTE: this controller has a strange state machine
363 * that involves "requesting sessions" according to
364 * magic side effects from incompletely-described
365 * rules about startup...
366 *
367 * This call is what really starts the host mode; be
368 * very careful about side effects if you reorder any
369 * initialization logic, e.g. for OTG, or change any
370 * logic relating to VBUS power-up.
371 */
372 if (!hcd->self.is_b_host && musb_has_gadget(musb))
373 start_musb = true;
374 break;
375 case USB_PORT_FEAT_RESET:
376 musb_port_reset(musb, true);
377 break;
378 case USB_PORT_FEAT_SUSPEND:
379 musb_port_suspend(musb, true);
380 break;
381 case USB_PORT_FEAT_TEST:
382 if (unlikely(is_host_active(musb)))
383 goto error;
384
385 wIndex >>= 8;
386 switch (wIndex) {
387 case USB_TEST_J:
388 pr_debug("USB_TEST_J\n");
389 temp = MUSB_TEST_J;
390 break;
391 case USB_TEST_K:
392 pr_debug("USB_TEST_K\n");
393 temp = MUSB_TEST_K;
394 break;
395 case USB_TEST_SE0_NAK:
396 pr_debug("USB_TEST_SE0_NAK\n");
397 temp = MUSB_TEST_SE0_NAK;
398 break;
399 case USB_TEST_PACKET:
400 pr_debug("USB_TEST_PACKET\n");
401 temp = MUSB_TEST_PACKET;
402 musb_load_testpacket(musb);
403 break;
404 case USB_TEST_FORCE_ENABLE:
405 pr_debug("USB_TEST_FORCE_ENABLE\n");
406 temp = MUSB_TEST_FORCE_HOST
407 | MUSB_TEST_FORCE_HS;
408
409 musb_writeb(musb->mregs, MUSB_DEVCTL,
410 MUSB_DEVCTL_SESSION);
411 break;
412 case 6:
413 pr_debug("TEST_FIFO_ACCESS\n");
414 temp = MUSB_TEST_FIFO_ACCESS;
415 break;
416 default:
417 goto error;
418 }
419 musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
420 break;
421 default:
422 goto error;
423 }
424 musb_dbg(musb, "set feature %d", wValue);
425 musb->port1_status |= 1 << wValue;
426 break;
427
428 default:
429error:
430 /* "protocol stall" on error */
431 retval = -EPIPE;
432 }
433 spin_unlock_irqrestore(&musb->lock, flags);
434
435 if (start_musb)
436 musb_start(musb);
437
438 return retval;
439}