1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Wireless Host Controller (WHC) interrupt handling.
 4 *
 5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
 6 */
 7#include <linux/kernel.h>
 8#include <linux/uwb/umc.h>
 9
10#include "../../wusbcore/wusbhc.h"
11
12#include "whcd.h"
13
14static void transfer_done(struct whc *whc)
15{
16	queue_work(whc->workqueue, &whc->async_work);
17	queue_work(whc->workqueue, &whc->periodic_work);
18}
19
20irqreturn_t whc_int_handler(struct usb_hcd *hcd)
21{
22	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd);
23	struct whc *whc = wusbhc_to_whc(wusbhc);
24	u32 sts;
25
26	sts = le_readl(whc->base + WUSBSTS);
27	if (!(sts & WUSBSTS_INT_MASK))
28		return IRQ_NONE;
29	le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS);
30
31	if (sts & WUSBSTS_GEN_CMD_DONE)
32		wake_up(&whc->cmd_wq);
33
34	if (sts & WUSBSTS_HOST_ERR)
35		dev_err(&whc->umc->dev, "FIXME: host system error\n");
36
37	if (sts & WUSBSTS_ASYNC_SCHED_SYNCED)
38		wake_up(&whc->async_list_wq);
39
40	if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED)
41		wake_up(&whc->periodic_list_wq);
42
43	if (sts & WUSBSTS_DNTS_INT)
44		queue_work(whc->workqueue, &whc->dn_work);
45
46	/*
47	 * A transfer completed (see [WHCI] section 4.7.1.2 for when
48	 * this occurs).
49	 */
50	if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT))
51		transfer_done(whc);
52
53	return IRQ_HANDLED;
54}
55
56static int process_dn_buf(struct whc *whc)
57{
58	struct wusbhc *wusbhc = &whc->wusbhc;
59	struct dn_buf_entry *dn;
60	int processed = 0;
61
62	for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) {
63		if (dn->status & WHC_DN_STATUS_VALID) {
64			wusbhc_handle_dn(wusbhc, dn->src_addr,
65					 (struct wusb_dn_hdr *)dn->dn_data,
66					 dn->msg_size);
67			dn->status &= ~WHC_DN_STATUS_VALID;
68			processed++;
69		}
70	}
71	return processed;
72}
73
74void whc_dn_work(struct work_struct *work)
75{
76	struct whc *whc = container_of(work, struct whc, dn_work);
77	int processed;
78
79	do {
80		processed = process_dn_buf(whc);
81	} while (processed);
82}