tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}