1/* 2 * Wireless Host Controller (WHC) interrupt handling. 3 * 4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/uwb/umc.h> 21 22#include "../../wusbcore/wusbhc.h" 23 24#include "whcd.h" 25 26static void transfer_done(struct whc *whc) 27{ 28 queue_work(whc->workqueue, &whc->async_work); 29 queue_work(whc->workqueue, &whc->periodic_work); 30} 31 32irqreturn_t whc_int_handler(struct usb_hcd *hcd) 33{ 34 struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd); 35 struct whc *whc = wusbhc_to_whc(wusbhc); 36 u32 sts; 37 38 sts = le_readl(whc->base + WUSBSTS); 39 if (!(sts & WUSBSTS_INT_MASK)) 40 return IRQ_NONE; 41 le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS); 42 43 if (sts & WUSBSTS_GEN_CMD_DONE) 44 wake_up(&whc->cmd_wq); 45 46 if (sts & WUSBSTS_HOST_ERR) 47 dev_err(&whc->umc->dev, "FIXME: host system error\n"); 48 49 if (sts & WUSBSTS_ASYNC_SCHED_SYNCED) 50 wake_up(&whc->async_list_wq); 51 52 if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED) 53 wake_up(&whc->periodic_list_wq); 54 55 if (sts & WUSBSTS_DNTS_INT) 56 queue_work(whc->workqueue, &whc->dn_work); 57 58 /* 59 * A transfer completed (see [WHCI] section 4.7.1.2 for when 60 * this occurs). 61 */ 62 if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT)) 63 transfer_done(whc); 64 65 return IRQ_HANDLED; 66} 67 68static int process_dn_buf(struct whc *whc) 69{ 70 struct wusbhc *wusbhc = &whc->wusbhc; 71 struct dn_buf_entry *dn; 72 int processed = 0; 73 74 for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) { 75 if (dn->status & WHC_DN_STATUS_VALID) { 76 wusbhc_handle_dn(wusbhc, dn->src_addr, 77 (struct wusb_dn_hdr *)dn->dn_data, 78 dn->msg_size); 79 dn->status &= ~WHC_DN_STATUS_VALID; 80 processed++; 81 } 82 } 83 return processed; 84} 85 86void whc_dn_work(struct work_struct *work) 87{ 88 struct whc *whc = container_of(work, struct whc, dn_work); 89 int processed; 90 91 do { 92 processed = process_dn_buf(whc); 93 } while (processed); 94} 95