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550a7375 FB |
1 | /* |
2 | * MUSB OTG driver virtual root hub support | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2006 by Texas Instruments | |
6 | * Copyright (C) 2006-2007 Nokia Corporation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * 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., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED | |
23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
25 | * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
26 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
27 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
28 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
29 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
31 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/time.h> | |
42 | #include <linux/timer.h> | |
43 | ||
44 | #include <asm/unaligned.h> | |
45 | ||
46 | #include "musb_core.h" | |
47 | ||
48 | ||
49 | static void musb_port_suspend(struct musb *musb, bool do_suspend) | |
50 | { | |
51 | u8 power; | |
52 | void __iomem *mbase = musb->mregs; | |
53 | ||
54 | if (!is_host_active(musb)) | |
55 | return; | |
56 | ||
57 | /* NOTE: this doesn't necessarily put PHY into low power mode, | |
58 | * turning off its clock; that's a function of PHY integration and | |
59 | * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect | |
60 | * SE0 changing to connect (J) or wakeup (K) states. | |
61 | */ | |
62 | power = musb_readb(mbase, MUSB_POWER); | |
63 | if (do_suspend) { | |
64 | int retries = 10000; | |
65 | ||
66 | power &= ~MUSB_POWER_RESUME; | |
67 | power |= MUSB_POWER_SUSPENDM; | |
68 | musb_writeb(mbase, MUSB_POWER, power); | |
69 | ||
70 | /* Needed for OPT A tests */ | |
71 | power = musb_readb(mbase, MUSB_POWER); | |
72 | while (power & MUSB_POWER_SUSPENDM) { | |
73 | power = musb_readb(mbase, MUSB_POWER); | |
74 | if (retries-- < 1) | |
75 | break; | |
76 | } | |
77 | ||
78 | DBG(3, "Root port suspended, power %02x\n", power); | |
79 | ||
80 | musb->port1_status |= USB_PORT_STAT_SUSPEND; | |
84e250ff | 81 | switch (musb->xceiv->state) { |
550a7375 | 82 | case OTG_STATE_A_HOST: |
84e250ff | 83 | musb->xceiv->state = OTG_STATE_A_SUSPEND; |
550a7375 | 84 | musb->is_active = is_otg_enabled(musb) |
84e250ff | 85 | && musb->xceiv->host->b_hnp_enable; |
550a7375 FB |
86 | musb_platform_try_idle(musb, 0); |
87 | break; | |
88 | #ifdef CONFIG_USB_MUSB_OTG | |
89 | case OTG_STATE_B_HOST: | |
84e250ff | 90 | musb->xceiv->state = OTG_STATE_B_WAIT_ACON; |
550a7375 | 91 | musb->is_active = is_otg_enabled(musb) |
84e250ff | 92 | && musb->xceiv->host->b_hnp_enable; |
550a7375 FB |
93 | musb_platform_try_idle(musb, 0); |
94 | break; | |
95 | #endif | |
96 | default: | |
97 | DBG(1, "bogus rh suspend? %s\n", | |
98 | otg_state_string(musb)); | |
99 | } | |
100 | } else if (power & MUSB_POWER_SUSPENDM) { | |
101 | power &= ~MUSB_POWER_SUSPENDM; | |
102 | power |= MUSB_POWER_RESUME; | |
103 | musb_writeb(mbase, MUSB_POWER, power); | |
104 | ||
105 | DBG(3, "Root port resuming, power %02x\n", power); | |
106 | ||
107 | /* later, GetPortStatus will stop RESUME signaling */ | |
108 | musb->port1_status |= MUSB_PORT_STAT_RESUME; | |
109 | musb->rh_timer = jiffies + msecs_to_jiffies(20); | |
110 | } | |
111 | } | |
112 | ||
113 | static void musb_port_reset(struct musb *musb, bool do_reset) | |
114 | { | |
115 | u8 power; | |
116 | void __iomem *mbase = musb->mregs; | |
117 | ||
118 | #ifdef CONFIG_USB_MUSB_OTG | |
84e250ff | 119 | if (musb->xceiv->state == OTG_STATE_B_IDLE) { |
550a7375 FB |
120 | DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n"); |
121 | musb->port1_status &= ~USB_PORT_STAT_RESET; | |
122 | return; | |
123 | } | |
124 | #endif | |
125 | ||
126 | if (!is_host_active(musb)) | |
127 | return; | |
128 | ||
129 | /* NOTE: caller guarantees it will turn off the reset when | |
130 | * the appropriate amount of time has passed | |
131 | */ | |
132 | power = musb_readb(mbase, MUSB_POWER); | |
133 | if (do_reset) { | |
134 | ||
135 | /* | |
136 | * If RESUME is set, we must make sure it stays minimum 20 ms. | |
137 | * Then we must clear RESUME and wait a bit to let musb start | |
138 | * generating SOFs. If we don't do this, OPT HS A 6.8 tests | |
139 | * fail with "Error! Did not receive an SOF before suspend | |
140 | * detected". | |
141 | */ | |
142 | if (power & MUSB_POWER_RESUME) { | |
143 | while (time_before(jiffies, musb->rh_timer)) | |
144 | msleep(1); | |
145 | musb_writeb(mbase, MUSB_POWER, | |
146 | power & ~MUSB_POWER_RESUME); | |
147 | msleep(1); | |
148 | } | |
149 | ||
150 | musb->ignore_disconnect = true; | |
151 | power &= 0xf0; | |
152 | musb_writeb(mbase, MUSB_POWER, | |
153 | power | MUSB_POWER_RESET); | |
154 | ||
155 | musb->port1_status |= USB_PORT_STAT_RESET; | |
156 | musb->port1_status &= ~USB_PORT_STAT_ENABLE; | |
157 | musb->rh_timer = jiffies + msecs_to_jiffies(50); | |
158 | } else { | |
159 | DBG(4, "root port reset stopped\n"); | |
160 | musb_writeb(mbase, MUSB_POWER, | |
161 | power & ~MUSB_POWER_RESET); | |
162 | ||
163 | musb->ignore_disconnect = false; | |
164 | ||
165 | power = musb_readb(mbase, MUSB_POWER); | |
166 | if (power & MUSB_POWER_HSMODE) { | |
167 | DBG(4, "high-speed device connected\n"); | |
168 | musb->port1_status |= USB_PORT_STAT_HIGH_SPEED; | |
169 | } | |
170 | ||
171 | musb->port1_status &= ~USB_PORT_STAT_RESET; | |
172 | musb->port1_status |= USB_PORT_STAT_ENABLE | |
173 | | (USB_PORT_STAT_C_RESET << 16) | |
174 | | (USB_PORT_STAT_C_ENABLE << 16); | |
175 | usb_hcd_poll_rh_status(musb_to_hcd(musb)); | |
176 | ||
177 | musb->vbuserr_retry = VBUSERR_RETRY_COUNT; | |
178 | } | |
179 | } | |
180 | ||
181 | void musb_root_disconnect(struct musb *musb) | |
182 | { | |
183 | musb->port1_status = (1 << USB_PORT_FEAT_POWER) | |
184 | | (1 << USB_PORT_FEAT_C_CONNECTION); | |
185 | ||
186 | usb_hcd_poll_rh_status(musb_to_hcd(musb)); | |
187 | musb->is_active = 0; | |
188 | ||
84e250ff | 189 | switch (musb->xceiv->state) { |
550a7375 FB |
190 | case OTG_STATE_A_HOST: |
191 | case OTG_STATE_A_SUSPEND: | |
84e250ff | 192 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; |
550a7375 FB |
193 | musb->is_active = 0; |
194 | break; | |
195 | case OTG_STATE_A_WAIT_VFALL: | |
84e250ff | 196 | musb->xceiv->state = OTG_STATE_B_IDLE; |
550a7375 FB |
197 | break; |
198 | default: | |
199 | DBG(1, "host disconnect (%s)\n", otg_state_string(musb)); | |
200 | } | |
201 | } | |
202 | ||
203 | ||
204 | /*---------------------------------------------------------------------*/ | |
205 | ||
206 | /* Caller may or may not hold musb->lock */ | |
207 | int musb_hub_status_data(struct usb_hcd *hcd, char *buf) | |
208 | { | |
209 | struct musb *musb = hcd_to_musb(hcd); | |
210 | int retval = 0; | |
211 | ||
212 | /* called in_irq() via usb_hcd_poll_rh_status() */ | |
213 | if (musb->port1_status & 0xffff0000) { | |
214 | *buf = 0x02; | |
215 | retval = 1; | |
216 | } | |
217 | return retval; | |
218 | } | |
219 | ||
220 | int musb_hub_control( | |
221 | struct usb_hcd *hcd, | |
222 | u16 typeReq, | |
223 | u16 wValue, | |
224 | u16 wIndex, | |
225 | char *buf, | |
226 | u16 wLength) | |
227 | { | |
228 | struct musb *musb = hcd_to_musb(hcd); | |
229 | u32 temp; | |
230 | int retval = 0; | |
231 | unsigned long flags; | |
232 | ||
233 | spin_lock_irqsave(&musb->lock, flags); | |
234 | ||
235 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) { | |
236 | spin_unlock_irqrestore(&musb->lock, flags); | |
237 | return -ESHUTDOWN; | |
238 | } | |
239 | ||
240 | /* hub features: always zero, setting is a NOP | |
241 | * port features: reported, sometimes updated when host is active | |
242 | * no indicators | |
243 | */ | |
244 | switch (typeReq) { | |
245 | case ClearHubFeature: | |
246 | case SetHubFeature: | |
247 | switch (wValue) { | |
248 | case C_HUB_OVER_CURRENT: | |
249 | case C_HUB_LOCAL_POWER: | |
250 | break; | |
251 | default: | |
252 | goto error; | |
253 | } | |
254 | break; | |
255 | case ClearPortFeature: | |
256 | if ((wIndex & 0xff) != 1) | |
257 | goto error; | |
258 | ||
259 | switch (wValue) { | |
260 | case USB_PORT_FEAT_ENABLE: | |
261 | break; | |
262 | case USB_PORT_FEAT_SUSPEND: | |
263 | musb_port_suspend(musb, false); | |
264 | break; | |
265 | case USB_PORT_FEAT_POWER: | |
266 | if (!(is_otg_enabled(musb) && hcd->self.is_b_host)) | |
267 | musb_set_vbus(musb, 0); | |
268 | break; | |
269 | case USB_PORT_FEAT_C_CONNECTION: | |
270 | case USB_PORT_FEAT_C_ENABLE: | |
271 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
272 | case USB_PORT_FEAT_C_RESET: | |
273 | case USB_PORT_FEAT_C_SUSPEND: | |
274 | break; | |
275 | default: | |
276 | goto error; | |
277 | } | |
278 | DBG(5, "clear feature %d\n", wValue); | |
279 | musb->port1_status &= ~(1 << wValue); | |
280 | break; | |
281 | case GetHubDescriptor: | |
282 | { | |
283 | struct usb_hub_descriptor *desc = (void *)buf; | |
284 | ||
285 | desc->bDescLength = 9; | |
286 | desc->bDescriptorType = 0x29; | |
287 | desc->bNbrPorts = 1; | |
551509d2 | 288 | desc->wHubCharacteristics = cpu_to_le16( |
550a7375 FB |
289 | 0x0001 /* per-port power switching */ |
290 | | 0x0010 /* no overcurrent reporting */ | |
291 | ); | |
292 | desc->bPwrOn2PwrGood = 5; /* msec/2 */ | |
293 | desc->bHubContrCurrent = 0; | |
294 | ||
295 | /* workaround bogus struct definition */ | |
296 | desc->DeviceRemovable[0] = 0x02; /* port 1 */ | |
297 | desc->DeviceRemovable[1] = 0xff; | |
298 | } | |
299 | break; | |
300 | case GetHubStatus: | |
301 | temp = 0; | |
302 | *(__le32 *) buf = cpu_to_le32(temp); | |
303 | break; | |
304 | case GetPortStatus: | |
305 | if (wIndex != 1) | |
306 | goto error; | |
307 | ||
308 | /* finish RESET signaling? */ | |
309 | if ((musb->port1_status & USB_PORT_STAT_RESET) | |
310 | && time_after_eq(jiffies, musb->rh_timer)) | |
311 | musb_port_reset(musb, false); | |
312 | ||
313 | /* finish RESUME signaling? */ | |
314 | if ((musb->port1_status & MUSB_PORT_STAT_RESUME) | |
315 | && time_after_eq(jiffies, musb->rh_timer)) { | |
316 | u8 power; | |
317 | ||
318 | power = musb_readb(musb->mregs, MUSB_POWER); | |
319 | power &= ~MUSB_POWER_RESUME; | |
320 | DBG(4, "root port resume stopped, power %02x\n", | |
321 | power); | |
322 | musb_writeb(musb->mregs, MUSB_POWER, power); | |
323 | ||
324 | /* ISSUE: DaVinci (RTL 1.300) disconnects after | |
325 | * resume of high speed peripherals (but not full | |
326 | * speed ones). | |
327 | */ | |
328 | ||
329 | musb->is_active = 1; | |
330 | musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | |
331 | | MUSB_PORT_STAT_RESUME); | |
332 | musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16; | |
333 | usb_hcd_poll_rh_status(musb_to_hcd(musb)); | |
334 | /* NOTE: it might really be A_WAIT_BCON ... */ | |
84e250ff | 335 | musb->xceiv->state = OTG_STATE_A_HOST; |
550a7375 FB |
336 | } |
337 | ||
338 | put_unaligned(cpu_to_le32(musb->port1_status | |
339 | & ~MUSB_PORT_STAT_RESUME), | |
340 | (__le32 *) buf); | |
341 | ||
342 | /* port change status is more interesting */ | |
343 | DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "port status %08x\n", | |
344 | musb->port1_status); | |
345 | break; | |
346 | case SetPortFeature: | |
347 | if ((wIndex & 0xff) != 1) | |
348 | goto error; | |
349 | ||
350 | switch (wValue) { | |
351 | case USB_PORT_FEAT_POWER: | |
352 | /* NOTE: this controller has a strange state machine | |
353 | * that involves "requesting sessions" according to | |
354 | * magic side effects from incompletely-described | |
355 | * rules about startup... | |
356 | * | |
357 | * This call is what really starts the host mode; be | |
358 | * very careful about side effects if you reorder any | |
359 | * initialization logic, e.g. for OTG, or change any | |
360 | * logic relating to VBUS power-up. | |
361 | */ | |
362 | if (!(is_otg_enabled(musb) && hcd->self.is_b_host)) | |
363 | musb_start(musb); | |
364 | break; | |
365 | case USB_PORT_FEAT_RESET: | |
366 | musb_port_reset(musb, true); | |
367 | break; | |
368 | case USB_PORT_FEAT_SUSPEND: | |
369 | musb_port_suspend(musb, true); | |
370 | break; | |
371 | case USB_PORT_FEAT_TEST: | |
372 | if (unlikely(is_host_active(musb))) | |
373 | goto error; | |
374 | ||
375 | wIndex >>= 8; | |
376 | switch (wIndex) { | |
377 | case 1: | |
378 | pr_debug("TEST_J\n"); | |
379 | temp = MUSB_TEST_J; | |
380 | break; | |
381 | case 2: | |
382 | pr_debug("TEST_K\n"); | |
383 | temp = MUSB_TEST_K; | |
384 | break; | |
385 | case 3: | |
386 | pr_debug("TEST_SE0_NAK\n"); | |
387 | temp = MUSB_TEST_SE0_NAK; | |
388 | break; | |
389 | case 4: | |
390 | pr_debug("TEST_PACKET\n"); | |
391 | temp = MUSB_TEST_PACKET; | |
392 | musb_load_testpacket(musb); | |
393 | break; | |
394 | case 5: | |
395 | pr_debug("TEST_FORCE_ENABLE\n"); | |
396 | temp = MUSB_TEST_FORCE_HOST | |
397 | | MUSB_TEST_FORCE_HS; | |
398 | ||
399 | musb_writeb(musb->mregs, MUSB_DEVCTL, | |
400 | MUSB_DEVCTL_SESSION); | |
401 | break; | |
402 | case 6: | |
403 | pr_debug("TEST_FIFO_ACCESS\n"); | |
404 | temp = MUSB_TEST_FIFO_ACCESS; | |
405 | break; | |
406 | default: | |
407 | goto error; | |
408 | } | |
409 | musb_writeb(musb->mregs, MUSB_TESTMODE, temp); | |
410 | break; | |
411 | default: | |
412 | goto error; | |
413 | } | |
414 | DBG(5, "set feature %d\n", wValue); | |
415 | musb->port1_status |= 1 << wValue; | |
416 | break; | |
417 | ||
418 | default: | |
419 | error: | |
420 | /* "protocol stall" on error */ | |
421 | retval = -EPIPE; | |
422 | } | |
423 | spin_unlock_irqrestore(&musb->lock, flags); | |
424 | return retval; | |
425 | } |