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ath9k: allow run-time change of the chanbw debugfs file
[openwrt.git] / target / linux / adm5120 / files / drivers / usb / host / adm5120-hub.c
1 /*
2 * ADM5120 HCD (Host Controller Driver) for USB
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This file was derived from: drivers/usb/host/ohci-hub.c
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 */
15
16 /*-------------------------------------------------------------------------*/
17
18 /*
19 * ADM5120 Root Hub ... the nonsharable stuff
20 */
21
22 #define dbg_port(hc, label, num, value) \
23 admhc_dbg(hc, \
24 "%s port%d " \
25 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
26 label, num, value, \
27 (value & ADMHC_PS_PRSC) ? " PRSC" : "", \
28 (value & ADMHC_PS_OCIC) ? " OCIC" : "", \
29 (value & ADMHC_PS_PSSC) ? " PSSC" : "", \
30 (value & ADMHC_PS_PESC) ? " PESC" : "", \
31 (value & ADMHC_PS_CSC) ? " CSC" : "", \
32 \
33 (value & ADMHC_PS_LSDA) ? " LSDA" : "", \
34 (value & ADMHC_PS_PPS) ? " PPS" : "", \
35 (value & ADMHC_PS_PRS) ? " PRS" : "", \
36 (value & ADMHC_PS_POCI) ? " POCI" : "", \
37 (value & ADMHC_PS_PSS) ? " PSS" : "", \
38 \
39 (value & ADMHC_PS_PES) ? " PES" : "", \
40 (value & ADMHC_PS_CCS) ? " CCS" : "" \
41 );
42
43 #define dbg_port_write(hc, label, num, value) \
44 admhc_dbg(hc, \
45 "%s port%d " \
46 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
47 label, num, value, \
48 (value & ADMHC_PS_PRSC) ? " PRSC" : "", \
49 (value & ADMHC_PS_OCIC) ? " OCIC" : "", \
50 (value & ADMHC_PS_PSSC) ? " PSSC" : "", \
51 (value & ADMHC_PS_PESC) ? " PESC" : "", \
52 (value & ADMHC_PS_CSC) ? " CSC" : "", \
53 \
54 (value & ADMHC_PS_CPP) ? " CPP" : "", \
55 (value & ADMHC_PS_SPP) ? " SPP" : "", \
56 (value & ADMHC_PS_SPR) ? " SPR" : "", \
57 (value & ADMHC_PS_CPS) ? " CPS" : "", \
58 (value & ADMHC_PS_SPS) ? " SPS" : "", \
59 \
60 (value & ADMHC_PS_SPE) ? " SPE" : "", \
61 (value & ADMHC_PS_CPE) ? " CPE" : "" \
62 );
63
64 /*-------------------------------------------------------------------------*/
65
66 /* build "status change" packet (one or two bytes) from HC registers */
67
68 static int
69 admhc_hub_status_data(struct usb_hcd *hcd, char *buf)
70 {
71 struct admhcd *ahcd = hcd_to_admhcd(hcd);
72 int i, changed = 0, length = 1;
73 int any_connected = 0;
74 unsigned long flags;
75 u32 status;
76
77 spin_lock_irqsave(&ahcd->lock, flags);
78 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
79 goto done;
80
81 /* init status */
82 status = admhc_read_rhdesc(ahcd);
83 if (status & (ADMHC_RH_LPSC | ADMHC_RH_OCIC))
84 buf[0] = changed = 1;
85 else
86 buf[0] = 0;
87 if (ahcd->num_ports > 7) {
88 buf[1] = 0;
89 length++;
90 }
91
92 /* look at each port */
93 for (i = 0; i < ahcd->num_ports; i++) {
94 status = admhc_read_portstatus(ahcd, i);
95
96 /* can't autostop if ports are connected */
97 any_connected |= (status & ADMHC_PS_CCS);
98
99 if (status & (ADMHC_PS_CSC | ADMHC_PS_PESC | ADMHC_PS_PSSC
100 | ADMHC_PS_OCIC | ADMHC_PS_PRSC)) {
101 changed = 1;
102 if (i < 7)
103 buf[0] |= 1 << (i + 1);
104 else
105 buf[1] |= 1 << (i - 7);
106 }
107 }
108
109 hcd->poll_rh = admhc_root_hub_state_changes(ahcd, changed,
110 any_connected);
111
112 done:
113 spin_unlock_irqrestore(&ahcd->lock, flags);
114
115 return changed ? length : 0;
116 }
117
118 /*-------------------------------------------------------------------------*/
119
120 static int admhc_get_hub_descriptor(struct admhcd *ahcd, char *buf)
121 {
122 struct usb_hub_descriptor *desc = (struct usb_hub_descriptor *)buf;
123 u32 rh = admhc_read_rhdesc(ahcd);
124 u16 temp;
125
126 desc->bDescriptorType = USB_DT_HUB; /* Hub-descriptor */
127 desc->bPwrOn2PwrGood = ADMHC_POTPGT/2; /* use default value */
128 desc->bHubContrCurrent = 0x00; /* 0mA */
129
130 desc->bNbrPorts = ahcd->num_ports;
131 temp = 1 + (ahcd->num_ports / 8);
132 desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
133
134 /* FIXME */
135 temp = 0;
136 if (rh & ADMHC_RH_NPS) /* no power switching? */
137 temp |= 0x0002;
138 if (rh & ADMHC_RH_PSM) /* per-port power switching? */
139 temp |= 0x0001;
140 if (rh & ADMHC_RH_NOCP) /* no overcurrent reporting? */
141 temp |= 0x0010;
142 else if (rh & ADMHC_RH_OCPM) /* per-port overcurrent reporting? */
143 temp |= 0x0008;
144 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ahcd, temp);
145
146 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
147 desc->bitmap[0] = 0;
148 desc->bitmap[0] = ~0;
149
150 return 0;
151 }
152
153 static int admhc_get_hub_status(struct admhcd *ahcd, char *buf)
154 {
155 struct usb_hub_status *hs = (struct usb_hub_status *)buf;
156 u32 t = admhc_read_rhdesc(ahcd);
157 u16 status, change;
158
159 status = 0;
160 status |= (t & ADMHC_RH_LPS) ? HUB_STATUS_LOCAL_POWER : 0;
161 status |= (t & ADMHC_RH_OCI) ? HUB_STATUS_OVERCURRENT : 0;
162
163 change = 0;
164 change |= (t & ADMHC_RH_LPSC) ? HUB_CHANGE_LOCAL_POWER : 0;
165 change |= (t & ADMHC_RH_OCIC) ? HUB_CHANGE_OVERCURRENT : 0;
166
167 hs->wHubStatus = (__force __u16)cpu_to_hc16(ahcd, status);
168 hs->wHubChange = (__force __u16)cpu_to_hc16(ahcd, change);
169
170 return 0;
171 }
172
173 static int admhc_get_port_status(struct admhcd *ahcd, unsigned port, char *buf)
174 {
175 struct usb_port_status *ps = (struct usb_port_status *)buf;
176 u32 t = admhc_read_portstatus(ahcd, port);
177 u16 status, change;
178
179 status = 0;
180 status |= (t & ADMHC_PS_CCS) ? USB_PORT_STAT_CONNECTION : 0;
181 status |= (t & ADMHC_PS_PES) ? USB_PORT_STAT_ENABLE : 0;
182 status |= (t & ADMHC_PS_PSS) ? USB_PORT_STAT_SUSPEND : 0;
183 status |= (t & ADMHC_PS_POCI) ? USB_PORT_STAT_OVERCURRENT : 0;
184 status |= (t & ADMHC_PS_PRS) ? USB_PORT_STAT_RESET : 0;
185 status |= (t & ADMHC_PS_PPS) ? USB_PORT_STAT_POWER : 0;
186 status |= (t & ADMHC_PS_LSDA) ? USB_PORT_STAT_LOW_SPEED : 0;
187
188 change = 0;
189 change |= (t & ADMHC_PS_CSC) ? USB_PORT_STAT_C_CONNECTION : 0;
190 change |= (t & ADMHC_PS_PESC) ? USB_PORT_STAT_C_ENABLE : 0;
191 change |= (t & ADMHC_PS_PSSC) ? USB_PORT_STAT_C_SUSPEND : 0;
192 change |= (t & ADMHC_PS_OCIC) ? USB_PORT_STAT_C_OVERCURRENT : 0;
193 change |= (t & ADMHC_PS_PRSC) ? USB_PORT_STAT_C_RESET : 0;
194
195 ps->wPortStatus = (__force __u16)cpu_to_hc16(ahcd, status);
196 ps->wPortChange = (__force __u16)cpu_to_hc16(ahcd, change);
197
198 return 0;
199 }
200
201 /*-------------------------------------------------------------------------*/
202
203 #ifdef CONFIG_USB_OTG
204
205 static int admhc_start_port_reset(struct usb_hcd *hcd, unsigned port)
206 {
207 struct admhcd *ahcd = hcd_to_admhcd(hcd);
208 u32 status;
209
210 if (!port)
211 return -EINVAL;
212 port--;
213
214 /* start port reset before HNP protocol times out */
215 status = admhc_read_portstatus(ahcd, port);
216 if (!(status & ADMHC_PS_CCS))
217 return -ENODEV;
218
219 /* khubd will finish the reset later */
220 admhc_write_portstatus(ahcd, port, ADMHC_PS_PRS);
221 return 0;
222 }
223
224 static void start_hnp(struct admhcd *ahcd);
225
226 #else
227
228 #define admhc_start_port_reset NULL
229
230 #endif
231
232 /*-------------------------------------------------------------------------*/
233
234
235 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
236 * not necessarily continuous ... to guard against resume signaling.
237 * The short timeout is safe for non-root hubs, and is backward-compatible
238 * with earlier Linux hosts.
239 */
240 #ifdef CONFIG_USB_SUSPEND
241 #define PORT_RESET_MSEC 50
242 #else
243 #define PORT_RESET_MSEC 10
244 #endif
245
246 /* this timer value might be vendor-specific ... */
247 #define PORT_RESET_HW_MSEC 10
248
249 /* wrap-aware logic morphed from <linux/jiffies.h> */
250 #define tick_before(t1, t2) ((s16)(((s16)(t1)) - ((s16)(t2))) < 0)
251
252 /* called from some task, normally khubd */
253 static inline int admhc_port_reset(struct admhcd *ahcd, unsigned port)
254 {
255 u32 t;
256
257 admhc_vdbg(ahcd, "reset port%d\n", port);
258 t = admhc_read_portstatus(ahcd, port);
259 if (!(t & ADMHC_PS_CCS))
260 return -ENODEV;
261
262 admhc_write_portstatus(ahcd, port, ADMHC_PS_SPR);
263 mdelay(10);
264 admhc_write_portstatus(ahcd, port, (ADMHC_PS_SPE | ADMHC_PS_CSC));
265 mdelay(100);
266
267 return 0;
268 }
269
270 static inline int admhc_port_enable(struct admhcd *ahcd, unsigned port)
271 {
272 u32 t;
273
274 admhc_vdbg(ahcd, "enable port%d\n", port);
275 t = admhc_read_portstatus(ahcd, port);
276 if (!(t & ADMHC_PS_CCS))
277 return -ENODEV;
278
279 admhc_write_portstatus(ahcd, port, ADMHC_PS_SPE);
280
281 return 0;
282 }
283
284 static inline int admhc_port_disable(struct admhcd *ahcd, unsigned port)
285 {
286 u32 t;
287
288 admhc_vdbg(ahcd, "disable port%d\n", port);
289 t = admhc_read_portstatus(ahcd, port);
290 if (!(t & ADMHC_PS_CCS))
291 return -ENODEV;
292
293 admhc_write_portstatus(ahcd, port, ADMHC_PS_CPE);
294
295 return 0;
296 }
297
298 static inline int admhc_port_write(struct admhcd *ahcd, unsigned port,
299 u32 val)
300 {
301 #ifdef ADMHC_VERBOSE_DEBUG
302 dbg_port_write(ahcd, "write", port, val);
303 #endif
304 admhc_write_portstatus(ahcd, port, val);
305
306 return 0;
307 }
308
309 static int admhc_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
310 u16 wIndex, char *buf, u16 wLength)
311 {
312 struct admhcd *ahcd = hcd_to_admhcd(hcd);
313 int ports = hcd_to_bus(hcd)->root_hub->maxchild;
314 int ret = 0;
315
316 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
317 return -ESHUTDOWN;
318
319 switch (typeReq) {
320 case ClearHubFeature:
321 switch (wValue) {
322 case C_HUB_OVER_CURRENT:
323 #if 0 /* FIXME */
324 admhc_writel(ahcd, ADMHC_RH_OCIC,
325 &ahcd->regs->roothub.status);
326 #endif
327 case C_HUB_LOCAL_POWER:
328 break;
329 default:
330 goto error;
331 }
332 break;
333 case ClearPortFeature:
334 if (!wIndex || wIndex > ports)
335 goto error;
336 wIndex--;
337
338 switch (wValue) {
339 case USB_PORT_FEAT_ENABLE:
340 ret = admhc_port_disable(ahcd, wIndex);
341 break;
342 case USB_PORT_FEAT_SUSPEND:
343 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CPS);
344 break;
345 case USB_PORT_FEAT_POWER:
346 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CPP);
347 break;
348 case USB_PORT_FEAT_C_CONNECTION:
349 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_CSC);
350 break;
351 case USB_PORT_FEAT_C_ENABLE:
352 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PESC);
353 break;
354 case USB_PORT_FEAT_C_SUSPEND:
355 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PSSC);
356 break;
357 case USB_PORT_FEAT_C_OVER_CURRENT:
358 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_OCIC);
359 break;
360 case USB_PORT_FEAT_C_RESET:
361 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_PRSC);
362 break;
363 default:
364 goto error;
365 }
366 break;
367 case GetHubDescriptor:
368 ret = admhc_get_hub_descriptor(ahcd, buf);
369 break;
370 case GetHubStatus:
371 ret = admhc_get_hub_status(ahcd, buf);
372 break;
373 case GetPortStatus:
374 if (!wIndex || wIndex > ports)
375 goto error;
376 wIndex--;
377
378 ret = admhc_get_port_status(ahcd, wIndex, buf);
379 break;
380 case SetHubFeature:
381 switch (wValue) {
382 case C_HUB_OVER_CURRENT:
383 /* FIXME: this can be cleared, yes? */
384 case C_HUB_LOCAL_POWER:
385 break;
386 default:
387 goto error;
388 }
389 break;
390 case SetPortFeature:
391 if (!wIndex || wIndex > ports)
392 goto error;
393 wIndex--;
394
395 switch (wValue) {
396 case USB_PORT_FEAT_ENABLE:
397 ret = admhc_port_enable(ahcd, wIndex);
398 break;
399 case USB_PORT_FEAT_RESET:
400 ret = admhc_port_reset(ahcd, wIndex);
401 break;
402 case USB_PORT_FEAT_SUSPEND:
403 #ifdef CONFIG_USB_OTG
404 if (hcd->self.otg_port == (wIndex + 1)
405 && hcd->self.b_hnp_enable)
406 start_hnp(ahcd);
407 else
408 #endif
409 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_SPS);
410 break;
411 case USB_PORT_FEAT_POWER:
412 ret = admhc_port_write(ahcd, wIndex, ADMHC_PS_SPP);
413 break;
414 default:
415 goto error;
416 }
417 break;
418
419 default:
420 error:
421 /* "protocol stall" on error */
422 ret = -EPIPE;
423 }
424
425 return ret;
426 }
427
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