Commit | Line | Data |
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56f5b1cf PZ |
1 | /* |
2 | * core_intr.c - DesignWare HS OTG Controller common interrupt handling | |
3 | * | |
4 | * Copyright (C) 2004-2013 Synopsys, Inc. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions, and the following disclaimer, | |
11 | * without modification. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * 3. The names of the above-listed copyright holders may not be used | |
16 | * to endorse or promote products derived from this software without | |
17 | * specific prior written permission. | |
18 | * | |
19 | * ALTERNATIVELY, this software may be distributed under the terms of the | |
20 | * GNU General Public License ("GPL") as published by the Free Software | |
21 | * Foundation; either version 2 of the License, or (at your option) any | |
22 | * later version. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
25 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
26 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
27 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
28 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
29 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
30 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
31 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | /* | |
38 | * This file contains the common interrupt handlers | |
39 | */ | |
40 | #include <linux/kernel.h> | |
41 | #include <linux/module.h> | |
42 | #include <linux/moduleparam.h> | |
43 | #include <linux/spinlock.h> | |
44 | #include <linux/interrupt.h> | |
45 | #include <linux/dma-mapping.h> | |
46 | #include <linux/io.h> | |
47 | #include <linux/slab.h> | |
48 | #include <linux/usb.h> | |
49 | ||
50 | #include <linux/usb/hcd.h> | |
51 | #include <linux/usb/ch11.h> | |
52 | ||
53 | #include "core.h" | |
54 | #include "hcd.h" | |
55 | ||
56 | static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg) | |
57 | { | |
56f5b1cf PZ |
58 | switch (hsotg->op_state) { |
59 | case OTG_STATE_A_HOST: | |
60 | return "a_host"; | |
61 | case OTG_STATE_A_SUSPEND: | |
62 | return "a_suspend"; | |
63 | case OTG_STATE_A_PERIPHERAL: | |
64 | return "a_peripheral"; | |
65 | case OTG_STATE_B_PERIPHERAL: | |
66 | return "b_peripheral"; | |
67 | case OTG_STATE_B_HOST: | |
68 | return "b_host"; | |
69 | default: | |
70 | return "unknown"; | |
71 | } | |
56f5b1cf PZ |
72 | } |
73 | ||
93571adb DN |
74 | /** |
75 | * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts. | |
76 | * When the PRTINT interrupt fires, there are certain status bits in the Host | |
77 | * Port that needs to get cleared. | |
78 | * | |
79 | * @hsotg: Programming view of DWC_otg controller | |
80 | */ | |
81 | static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg) | |
82 | { | |
95c8bc36 | 83 | u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0); |
93571adb DN |
84 | |
85 | if (hprt0 & HPRT0_ENACHG) { | |
86 | hprt0 &= ~HPRT0_ENA; | |
95c8bc36 | 87 | dwc2_writel(hprt0, hsotg->regs + HPRT0); |
93571adb DN |
88 | } |
89 | ||
90 | /* Clear interrupt */ | |
95c8bc36 | 91 | dwc2_writel(GINTSTS_PRTINT, hsotg->regs + GINTSTS); |
93571adb DN |
92 | } |
93 | ||
56f5b1cf PZ |
94 | /** |
95 | * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message | |
96 | * | |
97 | * @hsotg: Programming view of DWC_otg controller | |
98 | */ | |
99 | static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg) | |
100 | { | |
101 | dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n", | |
102 | dwc2_is_host_mode(hsotg) ? "Host" : "Device"); | |
103 | ||
104 | /* Clear interrupt */ | |
95c8bc36 | 105 | dwc2_writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS); |
56f5b1cf PZ |
106 | } |
107 | ||
108 | /** | |
109 | * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG | |
110 | * Interrupt Register (GOTGINT) to determine what interrupt has occurred. | |
111 | * | |
112 | * @hsotg: Programming view of DWC_otg controller | |
113 | */ | |
114 | static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg) | |
115 | { | |
116 | u32 gotgint; | |
117 | u32 gotgctl; | |
118 | u32 gintmsk; | |
119 | ||
95c8bc36 AS |
120 | gotgint = dwc2_readl(hsotg->regs + GOTGINT); |
121 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); | |
56f5b1cf PZ |
122 | dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint, |
123 | dwc2_op_state_str(hsotg)); | |
124 | ||
125 | if (gotgint & GOTGINT_SES_END_DET) { | |
126 | dev_dbg(hsotg->dev, | |
127 | " ++OTG Interrupt: Session End Detected++ (%s)\n", | |
128 | dwc2_op_state_str(hsotg)); | |
95c8bc36 | 129 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf | 130 | |
4ace06e8 | 131 | if (dwc2_is_device_mode(hsotg)) |
1f91b4cc | 132 | dwc2_hsotg_disconnect(hsotg); |
4ace06e8 | 133 | |
56f5b1cf PZ |
134 | if (hsotg->op_state == OTG_STATE_B_HOST) { |
135 | hsotg->op_state = OTG_STATE_B_PERIPHERAL; | |
136 | } else { | |
137 | /* | |
138 | * If not B_HOST and Device HNP still set, HNP did | |
139 | * not succeed! | |
140 | */ | |
141 | if (gotgctl & GOTGCTL_DEVHNPEN) { | |
142 | dev_dbg(hsotg->dev, "Session End Detected\n"); | |
143 | dev_err(hsotg->dev, | |
144 | "Device Not Connected/Responding!\n"); | |
145 | } | |
146 | ||
147 | /* | |
148 | * If Session End Detected the B-Cable has been | |
149 | * disconnected | |
150 | */ | |
151 | /* Reset to a clean state */ | |
152 | hsotg->lx_state = DWC2_L0; | |
153 | } | |
154 | ||
95c8bc36 | 155 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf | 156 | gotgctl &= ~GOTGCTL_DEVHNPEN; |
95c8bc36 | 157 | dwc2_writel(gotgctl, hsotg->regs + GOTGCTL); |
56f5b1cf PZ |
158 | } |
159 | ||
160 | if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) { | |
161 | dev_dbg(hsotg->dev, | |
162 | " ++OTG Interrupt: Session Request Success Status Change++\n"); | |
95c8bc36 | 163 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf PZ |
164 | if (gotgctl & GOTGCTL_SESREQSCS) { |
165 | if (hsotg->core_params->phy_type == | |
166 | DWC2_PHY_TYPE_PARAM_FS | |
167 | && hsotg->core_params->i2c_enable > 0) { | |
168 | hsotg->srp_success = 1; | |
169 | } else { | |
170 | /* Clear Session Request */ | |
95c8bc36 | 171 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf | 172 | gotgctl &= ~GOTGCTL_SESREQ; |
95c8bc36 | 173 | dwc2_writel(gotgctl, hsotg->regs + GOTGCTL); |
56f5b1cf PZ |
174 | } |
175 | } | |
176 | } | |
177 | ||
178 | if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) { | |
179 | /* | |
180 | * Print statements during the HNP interrupt handling | |
181 | * can cause it to fail | |
182 | */ | |
95c8bc36 | 183 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf PZ |
184 | /* |
185 | * WA for 3.00a- HW is not setting cur_mode, even sometimes | |
186 | * this does not help | |
187 | */ | |
9badec2f | 188 | if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) |
56f5b1cf PZ |
189 | udelay(100); |
190 | if (gotgctl & GOTGCTL_HSTNEGSCS) { | |
191 | if (dwc2_is_host_mode(hsotg)) { | |
192 | hsotg->op_state = OTG_STATE_B_HOST; | |
193 | /* | |
194 | * Need to disable SOF interrupt immediately. | |
195 | * When switching from device to host, the PCD | |
196 | * interrupt handler won't handle the interrupt | |
197 | * if host mode is already set. The HCD | |
198 | * interrupt handler won't get called if the | |
199 | * HCD state is HALT. This means that the | |
200 | * interrupt does not get handled and Linux | |
201 | * complains loudly. | |
202 | */ | |
95c8bc36 | 203 | gintmsk = dwc2_readl(hsotg->regs + GINTMSK); |
56f5b1cf | 204 | gintmsk &= ~GINTSTS_SOF; |
95c8bc36 | 205 | dwc2_writel(gintmsk, hsotg->regs + GINTMSK); |
56f5b1cf PZ |
206 | |
207 | /* | |
208 | * Call callback function with spin lock | |
209 | * released | |
210 | */ | |
211 | spin_unlock(&hsotg->lock); | |
212 | ||
213 | /* Initialize the Core for Host mode */ | |
214 | dwc2_hcd_start(hsotg); | |
215 | spin_lock(&hsotg->lock); | |
216 | hsotg->op_state = OTG_STATE_B_HOST; | |
217 | } | |
218 | } else { | |
95c8bc36 | 219 | gotgctl = dwc2_readl(hsotg->regs + GOTGCTL); |
56f5b1cf | 220 | gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN); |
95c8bc36 | 221 | dwc2_writel(gotgctl, hsotg->regs + GOTGCTL); |
56f5b1cf PZ |
222 | dev_dbg(hsotg->dev, "HNP Failed\n"); |
223 | dev_err(hsotg->dev, | |
224 | "Device Not Connected/Responding\n"); | |
225 | } | |
226 | } | |
227 | ||
228 | if (gotgint & GOTGINT_HST_NEG_DET) { | |
229 | /* | |
230 | * The disconnect interrupt is set at the same time as | |
231 | * Host Negotiation Detected. During the mode switch all | |
232 | * interrupts are cleared so the disconnect interrupt | |
233 | * handler will not get executed. | |
234 | */ | |
235 | dev_dbg(hsotg->dev, | |
236 | " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n", | |
237 | (dwc2_is_host_mode(hsotg) ? "Host" : "Device")); | |
238 | if (dwc2_is_device_mode(hsotg)) { | |
239 | dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n", | |
240 | hsotg->op_state); | |
241 | spin_unlock(&hsotg->lock); | |
242 | dwc2_hcd_disconnect(hsotg); | |
243 | spin_lock(&hsotg->lock); | |
244 | hsotg->op_state = OTG_STATE_A_PERIPHERAL; | |
245 | } else { | |
246 | /* Need to disable SOF interrupt immediately */ | |
95c8bc36 | 247 | gintmsk = dwc2_readl(hsotg->regs + GINTMSK); |
56f5b1cf | 248 | gintmsk &= ~GINTSTS_SOF; |
95c8bc36 | 249 | dwc2_writel(gintmsk, hsotg->regs + GINTMSK); |
56f5b1cf PZ |
250 | spin_unlock(&hsotg->lock); |
251 | dwc2_hcd_start(hsotg); | |
252 | spin_lock(&hsotg->lock); | |
253 | hsotg->op_state = OTG_STATE_A_HOST; | |
254 | } | |
255 | } | |
256 | ||
257 | if (gotgint & GOTGINT_A_DEV_TOUT_CHG) | |
258 | dev_dbg(hsotg->dev, | |
259 | " ++OTG Interrupt: A-Device Timeout Change++\n"); | |
260 | if (gotgint & GOTGINT_DBNCE_DONE) | |
261 | dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n"); | |
262 | ||
263 | /* Clear GOTGINT */ | |
95c8bc36 | 264 | dwc2_writel(gotgint, hsotg->regs + GOTGINT); |
56f5b1cf PZ |
265 | } |
266 | ||
267 | /** | |
268 | * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status | |
269 | * Change Interrupt | |
270 | * | |
271 | * @hsotg: Programming view of DWC_otg controller | |
272 | * | |
273 | * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a | |
274 | * Device to Host Mode transition or a Host to Device Mode transition. This only | |
275 | * occurs when the cable is connected/removed from the PHY connector. | |
276 | */ | |
277 | static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg) | |
278 | { | |
95c8bc36 | 279 | u32 gintmsk = dwc2_readl(hsotg->regs + GINTMSK); |
56f5b1cf PZ |
280 | |
281 | /* Need to disable SOF interrupt immediately */ | |
282 | gintmsk &= ~GINTSTS_SOF; | |
95c8bc36 | 283 | dwc2_writel(gintmsk, hsotg->regs + GINTMSK); |
56f5b1cf PZ |
284 | |
285 | dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n", | |
286 | dwc2_is_host_mode(hsotg) ? "Host" : "Device"); | |
287 | ||
288 | /* | |
289 | * Need to schedule a work, as there are possible DELAY function calls. | |
290 | * Release lock before scheduling workq as it holds spinlock during | |
291 | * scheduling. | |
292 | */ | |
117777b2 DN |
293 | if (hsotg->wq_otg) { |
294 | spin_unlock(&hsotg->lock); | |
295 | queue_work(hsotg->wq_otg, &hsotg->wf_otg); | |
296 | spin_lock(&hsotg->lock); | |
297 | } | |
56f5b1cf PZ |
298 | |
299 | /* Clear interrupt */ | |
95c8bc36 | 300 | dwc2_writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS); |
56f5b1cf PZ |
301 | } |
302 | ||
303 | /** | |
304 | * dwc2_handle_session_req_intr() - This interrupt indicates that a device is | |
305 | * initiating the Session Request Protocol to request the host to turn on bus | |
306 | * power so a new session can begin | |
307 | * | |
308 | * @hsotg: Programming view of DWC_otg controller | |
309 | * | |
310 | * This handler responds by turning on bus power. If the DWC_otg controller is | |
311 | * in low power mode, this handler brings the controller out of low power mode | |
312 | * before turning on bus power. | |
313 | */ | |
314 | static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg) | |
315 | { | |
316 | dev_dbg(hsotg->dev, "++Session Request Interrupt++\n"); | |
317 | ||
318 | /* Clear interrupt */ | |
95c8bc36 | 319 | dwc2_writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS); |
4ace06e8 MS |
320 | |
321 | /* | |
322 | * Report disconnect if there is any previous session established | |
323 | */ | |
324 | if (dwc2_is_device_mode(hsotg)) | |
1f91b4cc | 325 | dwc2_hsotg_disconnect(hsotg); |
56f5b1cf PZ |
326 | } |
327 | ||
328 | /* | |
329 | * This interrupt indicates that the DWC_otg controller has detected a | |
330 | * resume or remote wakeup sequence. If the DWC_otg controller is in | |
331 | * low power mode, the handler must brings the controller out of low | |
332 | * power mode. The controller automatically begins resume signaling. | |
333 | * The handler schedules a time to stop resume signaling. | |
334 | */ | |
335 | static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg) | |
336 | { | |
f81f46e1 | 337 | int ret; |
56f5b1cf PZ |
338 | dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n"); |
339 | dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state); | |
340 | ||
341 | if (dwc2_is_device_mode(hsotg)) { | |
95c8bc36 AS |
342 | dev_dbg(hsotg->dev, "DSTS=0x%0x\n", |
343 | dwc2_readl(hsotg->regs + DSTS)); | |
56f5b1cf | 344 | if (hsotg->lx_state == DWC2_L2) { |
95c8bc36 | 345 | u32 dctl = dwc2_readl(hsotg->regs + DCTL); |
56f5b1cf PZ |
346 | |
347 | /* Clear Remote Wakeup Signaling */ | |
348 | dctl &= ~DCTL_RMTWKUPSIG; | |
95c8bc36 | 349 | dwc2_writel(dctl, hsotg->regs + DCTL); |
f81f46e1 | 350 | ret = dwc2_exit_hibernation(hsotg, true); |
285046aa | 351 | if (ret && (ret != -ENOTSUPP)) |
f81f46e1 GH |
352 | dev_err(hsotg->dev, "exit hibernation failed\n"); |
353 | ||
354 | call_gadget(hsotg, resume); | |
56f5b1cf PZ |
355 | } |
356 | /* Change to L0 state */ | |
357 | hsotg->lx_state = DWC2_L0; | |
358 | } else { | |
359 | if (hsotg->lx_state != DWC2_L1) { | |
95c8bc36 | 360 | u32 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL); |
56f5b1cf PZ |
361 | |
362 | /* Restart the Phy Clock */ | |
363 | pcgcctl &= ~PCGCTL_STOPPCLK; | |
95c8bc36 | 364 | dwc2_writel(pcgcctl, hsotg->regs + PCGCTL); |
56f5b1cf PZ |
365 | mod_timer(&hsotg->wkp_timer, |
366 | jiffies + msecs_to_jiffies(71)); | |
367 | } else { | |
368 | /* Change to L0 state */ | |
369 | hsotg->lx_state = DWC2_L0; | |
370 | } | |
371 | } | |
372 | ||
373 | /* Clear interrupt */ | |
95c8bc36 | 374 | dwc2_writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS); |
56f5b1cf PZ |
375 | } |
376 | ||
377 | /* | |
378 | * This interrupt indicates that a device has been disconnected from the | |
379 | * root port | |
380 | */ | |
381 | static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg) | |
382 | { | |
383 | dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n", | |
384 | dwc2_is_host_mode(hsotg) ? "Host" : "Device", | |
385 | dwc2_op_state_str(hsotg)); | |
386 | ||
509d612b YL |
387 | if (hsotg->op_state == OTG_STATE_A_HOST) |
388 | dwc2_hcd_disconnect(hsotg); | |
389 | ||
95c8bc36 | 390 | dwc2_writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS); |
56f5b1cf PZ |
391 | } |
392 | ||
393 | /* | |
394 | * This interrupt indicates that SUSPEND state has been detected on the USB. | |
395 | * | |
396 | * For HNP the USB Suspend interrupt signals the change from "a_peripheral" | |
397 | * to "a_host". | |
398 | * | |
399 | * When power management is enabled the core will be put in low power mode. | |
400 | */ | |
401 | static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg) | |
402 | { | |
403 | u32 dsts; | |
f81f46e1 | 404 | int ret; |
56f5b1cf PZ |
405 | |
406 | dev_dbg(hsotg->dev, "USB SUSPEND\n"); | |
407 | ||
408 | if (dwc2_is_device_mode(hsotg)) { | |
409 | /* | |
410 | * Check the Device status register to determine if the Suspend | |
411 | * state is active | |
412 | */ | |
95c8bc36 | 413 | dsts = dwc2_readl(hsotg->regs + DSTS); |
56f5b1cf PZ |
414 | dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts); |
415 | dev_dbg(hsotg->dev, | |
416 | "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n", | |
417 | !!(dsts & DSTS_SUSPSTS), | |
9badec2f | 418 | hsotg->hw_params.power_optimized); |
f81f46e1 GH |
419 | if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) { |
420 | /* Ignore suspend request before enumeration */ | |
421 | if (!dwc2_is_device_connected(hsotg)) { | |
422 | dev_dbg(hsotg->dev, | |
423 | "ignore suspend request before enumeration\n"); | |
424 | goto clear_int; | |
425 | } | |
426 | ||
427 | ret = dwc2_enter_hibernation(hsotg); | |
428 | if (ret) { | |
285046aa GH |
429 | if (ret != -ENOTSUPP) |
430 | dev_err(hsotg->dev, | |
431 | "enter hibernation failed\n"); | |
f81f46e1 GH |
432 | goto skip_power_saving; |
433 | } | |
434 | ||
435 | udelay(100); | |
436 | ||
437 | /* Ask phy to be suspended */ | |
438 | if (!IS_ERR_OR_NULL(hsotg->uphy)) | |
439 | usb_phy_set_suspend(hsotg->uphy, true); | |
440 | skip_power_saving: | |
3eb42df3 GH |
441 | /* |
442 | * Change to L2 (suspend) state before releasing | |
443 | * spinlock | |
444 | */ | |
445 | hsotg->lx_state = DWC2_L2; | |
446 | ||
f81f46e1 GH |
447 | /* Call gadget suspend callback */ |
448 | call_gadget(hsotg, suspend); | |
449 | } | |
56f5b1cf PZ |
450 | } else { |
451 | if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) { | |
452 | dev_dbg(hsotg->dev, "a_peripheral->a_host\n"); | |
453 | ||
3eb42df3 GH |
454 | /* Change to L2 (suspend) state */ |
455 | hsotg->lx_state = DWC2_L2; | |
56f5b1cf PZ |
456 | /* Clear the a_peripheral flag, back to a_host */ |
457 | spin_unlock(&hsotg->lock); | |
458 | dwc2_hcd_start(hsotg); | |
459 | spin_lock(&hsotg->lock); | |
460 | hsotg->op_state = OTG_STATE_A_HOST; | |
461 | } | |
462 | } | |
463 | ||
f81f46e1 | 464 | clear_int: |
56f5b1cf | 465 | /* Clear interrupt */ |
95c8bc36 | 466 | dwc2_writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS); |
56f5b1cf PZ |
467 | } |
468 | ||
469 | #define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \ | |
470 | GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \ | |
471 | GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \ | |
438492ab | 472 | GINTSTS_USBSUSP | GINTSTS_PRTINT) |
56f5b1cf PZ |
473 | |
474 | /* | |
475 | * This function returns the Core Interrupt register | |
476 | */ | |
477 | static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg) | |
478 | { | |
479 | u32 gintsts; | |
480 | u32 gintmsk; | |
481 | u32 gahbcfg; | |
482 | u32 gintmsk_common = GINTMSK_COMMON; | |
483 | ||
95c8bc36 AS |
484 | gintsts = dwc2_readl(hsotg->regs + GINTSTS); |
485 | gintmsk = dwc2_readl(hsotg->regs + GINTMSK); | |
486 | gahbcfg = dwc2_readl(hsotg->regs + GAHBCFG); | |
56f5b1cf | 487 | |
56f5b1cf PZ |
488 | /* If any common interrupts set */ |
489 | if (gintsts & gintmsk_common) | |
490 | dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n", | |
491 | gintsts, gintmsk); | |
56f5b1cf PZ |
492 | |
493 | if (gahbcfg & GAHBCFG_GLBL_INTR_EN) | |
494 | return gintsts & gintmsk & gintmsk_common; | |
495 | else | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Common interrupt handler | |
501 | * | |
502 | * The common interrupts are those that occur in both Host and Device mode. | |
503 | * This handler handles the following interrupts: | |
504 | * - Mode Mismatch Interrupt | |
505 | * - OTG Interrupt | |
506 | * - Connector ID Status Change Interrupt | |
507 | * - Disconnect Interrupt | |
508 | * - Session Request Interrupt | |
509 | * - Resume / Remote Wakeup Detected Interrupt | |
510 | * - Suspend Interrupt | |
511 | */ | |
512 | irqreturn_t dwc2_handle_common_intr(int irq, void *dev) | |
513 | { | |
514 | struct dwc2_hsotg *hsotg = dev; | |
515 | u32 gintsts; | |
6aafb003 | 516 | irqreturn_t retval = IRQ_NONE; |
56f5b1cf | 517 | |
cf54772b RB |
518 | spin_lock(&hsotg->lock); |
519 | ||
057715f2 PZ |
520 | if (!dwc2_is_controller_alive(hsotg)) { |
521 | dev_warn(hsotg->dev, "Controller is dead\n"); | |
56f5b1cf PZ |
522 | goto out; |
523 | } | |
524 | ||
56f5b1cf PZ |
525 | gintsts = dwc2_read_common_intr(hsotg); |
526 | if (gintsts & ~GINTSTS_PRTINT) | |
6aafb003 | 527 | retval = IRQ_HANDLED; |
56f5b1cf PZ |
528 | |
529 | if (gintsts & GINTSTS_MODEMIS) | |
530 | dwc2_handle_mode_mismatch_intr(hsotg); | |
531 | if (gintsts & GINTSTS_OTGINT) | |
532 | dwc2_handle_otg_intr(hsotg); | |
533 | if (gintsts & GINTSTS_CONIDSTSCHNG) | |
534 | dwc2_handle_conn_id_status_change_intr(hsotg); | |
535 | if (gintsts & GINTSTS_DISCONNINT) | |
536 | dwc2_handle_disconnect_intr(hsotg); | |
537 | if (gintsts & GINTSTS_SESSREQINT) | |
538 | dwc2_handle_session_req_intr(hsotg); | |
539 | if (gintsts & GINTSTS_WKUPINT) | |
540 | dwc2_handle_wakeup_detected_intr(hsotg); | |
541 | if (gintsts & GINTSTS_USBSUSP) | |
542 | dwc2_handle_usb_suspend_intr(hsotg); | |
543 | ||
56f5b1cf PZ |
544 | if (gintsts & GINTSTS_PRTINT) { |
545 | /* | |
546 | * The port interrupt occurs while in device mode with HPRT0 | |
547 | * Port Enable/Disable | |
548 | */ | |
549 | if (dwc2_is_device_mode(hsotg)) { | |
550 | dev_dbg(hsotg->dev, | |
551 | " --Port interrupt received in Device mode--\n"); | |
93571adb DN |
552 | dwc2_handle_usb_port_intr(hsotg); |
553 | retval = IRQ_HANDLED; | |
56f5b1cf PZ |
554 | } |
555 | } | |
556 | ||
56f5b1cf | 557 | out: |
cf54772b | 558 | spin_unlock(&hsotg->lock); |
6aafb003 | 559 | return retval; |
56f5b1cf | 560 | } |