wusb: WHCI host controller driver

A driver for Wireless USB host controllers that comply with the
Wireless Host Controller Interface (HCI) specification as published by
Intel.

The latest publically available version of the specification (0.95) is
supported (except for isochronous transfers).

Build fixes by Randy Dunlap <rdunlap@xenotime.net>

Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/drivers/usb/host/whci/int.c b/drivers/usb/host/whci/int.c
new file mode 100644
index 000000000000..fce01174aa9b
--- /dev/null
+++ b/drivers/usb/host/whci/int.c
@@ -0,0 +1,95 @@
+/*
+ * Wireless Host Controller (WHC) interrupt handling.
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/uwb/umc.h>
+
+#include "../../wusbcore/wusbhc.h"
+
+#include "whcd.h"
+
+static void transfer_done(struct whc *whc)
+{
+        queue_work(whc->workqueue, &whc->async_work);
+        queue_work(whc->workqueue, &whc->periodic_work);
+}
+
+irqreturn_t whc_int_handler(struct usb_hcd *hcd)
+{
+        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd);
+        struct whc *whc = wusbhc_to_whc(wusbhc);
+        u32 sts;
+
+        sts = le_readl(whc->base + WUSBSTS);
+        if (!(sts & WUSBSTS_INT_MASK))
+                return IRQ_NONE;
+        le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS);
+
+        if (sts & WUSBSTS_GEN_CMD_DONE)
+                wake_up(&whc->cmd_wq);
+
+        if (sts & WUSBSTS_HOST_ERR)
+                dev_err(&whc->umc->dev, "FIXME: host system error\n");
+
+        if (sts & WUSBSTS_ASYNC_SCHED_SYNCED)
+                wake_up(&whc->async_list_wq);
+
+        if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED)
+                wake_up(&whc->periodic_list_wq);
+
+        if (sts & WUSBSTS_DNTS_INT)
+                queue_work(whc->workqueue, &whc->dn_work);
+
+        /*
+         * A transfer completed (see [WHCI] section 4.7.1.2 for when
+         * this occurs).
+         */
+        if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT))
+                transfer_done(whc);
+
+        return IRQ_HANDLED;
+}
+
+static int process_dn_buf(struct whc *whc)
+{
+        struct wusbhc *wusbhc = &whc->wusbhc;
+        struct dn_buf_entry *dn;
+        int processed = 0;
+
+        for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) {
+                if (dn->status & WHC_DN_STATUS_VALID) {
+                        wusbhc_handle_dn(wusbhc, dn->src_addr,
+                                         (struct wusb_dn_hdr *)dn->dn_data,
+                                         dn->msg_size);
+                        dn->status &= ~WHC_DN_STATUS_VALID;
+                        processed++;
+                }
+        }
+        return processed;
+}
+
+void whc_dn_work(struct work_struct *work)
+{
+        struct whc *whc = container_of(work, struct whc, dn_work);
+        int processed;
+
+        do {
+                processed = process_dn_buf(whc);
+        } while (processed);
+}