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, 241 insertions, 0 deletions

diff --git a/drivers/usb/host/whci/wusb.c b/drivers/usb/host/whci/wusb.c
new file mode 100644
index 0000000..66e4ddc
--- /dev/null
+++ b/drivers/usb/host/whci/wusb.c
@@ -0,0 +1,241 @@
+/*
+ * Wireless Host Controller (WHC) WUSB operations.
+ *
+ * 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>
+#define D_LOCAL 1
+#include <linux/uwb/debug.h>
+
+#include "../../wusbcore/wusbhc.h"
+
+#include "whcd.h"
+
+#if D_LOCAL >= 1
+static void dump_di(struct whc *whc, int idx)
+{
+	struct di_buf_entry *di = &whc->di_buf[idx];
+	struct device *dev = &whc->umc->dev;
+	char buf[128];
+
+	bitmap_scnprintf(buf, sizeof(buf), (unsigned long *)di->availability_info, UWB_NUM_MAS);
+
+	d_printf(1, dev, "DI[%d]\n", idx);
+	d_printf(1, dev, "  availability: %s\n", buf);
+	d_printf(1, dev, "  %c%c key idx: %d dev addr: %d\n",
+		 (di->addr_sec_info & WHC_DI_SECURE) ? 'S' : ' ',
+		 (di->addr_sec_info & WHC_DI_DISABLE) ? 'D' : ' ',
+		 (di->addr_sec_info & WHC_DI_KEY_IDX_MASK) >> 8,
+		 (di->addr_sec_info & WHC_DI_DEV_ADDR_MASK));
+}
+#else
+static inline void dump_di(struct whc *whc, int idx)
+{
+}
+#endif
+
+static int whc_update_di(struct whc *whc, int idx)
+{
+	int offset = idx / 32;
+	u32 bit = 1 << (idx % 32);
+
+	dump_di(whc, idx);
+
+	le_writel(bit, whc->base + WUSBDIBUPDATED + offset);
+
+	return whci_wait_for(&whc->umc->dev,
+			     whc->base + WUSBDIBUPDATED + offset, bit, 0,
+			     100, "DI update");
+}
+
+/*
+ * WHCI starts and stops MMCs based on there being a valid GTK so
+ * these need only start/stop the asynchronous and periodic schedules.
+ */
+
+int whc_wusbhc_start(struct wusbhc *wusbhc)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+
+	asl_start(whc);
+	pzl_start(whc);
+
+	return 0;
+}
+
+void whc_wusbhc_stop(struct wusbhc *wusbhc)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+
+	pzl_stop(whc);
+	asl_stop(whc);
+}
+
+int whc_mmcie_add(struct wusbhc *wusbhc, u8 interval, u8 repeat_cnt,
+		  u8 handle, struct wuie_hdr *wuie)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	u32 params;
+
+	params = (interval << 24)
+		| (repeat_cnt << 16)
+		| (wuie->bLength << 8)
+		| handle;
+
+	return whc_do_gencmd(whc, WUSBGENCMDSTS_MMCIE_ADD, params, wuie, wuie->bLength);
+}
+
+int whc_mmcie_rm(struct wusbhc *wusbhc, u8 handle)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	u32 params;
+
+	params = handle;
+
+	return whc_do_gencmd(whc, WUSBGENCMDSTS_MMCIE_RM, params, NULL, 0);
+}
+
+int whc_bwa_set(struct wusbhc *wusbhc, s8 stream_index, const struct uwb_mas_bm *mas_bm)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+
+	if (stream_index >= 0)
+		whc_write_wusbcmd(whc, WUSBCMD_WUSBSI_MASK, WUSBCMD_WUSBSI(stream_index));
+
+	return whc_do_gencmd(whc, WUSBGENCMDSTS_SET_MAS, 0, (void *)mas_bm, sizeof(*mas_bm));
+}
+
+int whc_dev_info_set(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	int idx = wusb_dev->port_idx;
+	struct di_buf_entry *di = &whc->di_buf[idx];
+	int ret;
+
+	mutex_lock(&whc->mutex);
+
+	uwb_mas_bm_copy_le(di->availability_info, &wusb_dev->availability);
+	di->addr_sec_info &= ~(WHC_DI_DISABLE | WHC_DI_DEV_ADDR_MASK);
+	di->addr_sec_info |= WHC_DI_DEV_ADDR(wusb_dev->addr);
+
+	ret = whc_update_di(whc, idx);
+
+	mutex_unlock(&whc->mutex);
+
+	return ret;
+}
+
+/*
+ * Set the number of Device Notification Time Slots (DNTS) and enable
+ * device notifications.
+ */
+int whc_set_num_dnts(struct wusbhc *wusbhc, u8 interval, u8 slots)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	u32 dntsctrl;
+
+	dntsctrl = WUSBDNTSCTRL_ACTIVE
+		| WUSBDNTSCTRL_INTERVAL(interval)
+		| WUSBDNTSCTRL_SLOTS(slots);
+
+	le_writel(dntsctrl, whc->base + WUSBDNTSCTRL);
+
+	return 0;
+}
+
+static int whc_set_key(struct whc *whc, u8 key_index, uint32_t tkid,
+		       const void *key, size_t key_size, bool is_gtk)
+{
+	uint32_t setkeycmd;
+	uint32_t seckey[4];
+	int i;
+	int ret;
+
+	memcpy(seckey, key, key_size);
+	setkeycmd = WUSBSETSECKEYCMD_SET | WUSBSETSECKEYCMD_IDX(key_index);
+	if (is_gtk)
+		setkeycmd |= WUSBSETSECKEYCMD_GTK;
+
+	le_writel(tkid, whc->base + WUSBTKID);
+	for (i = 0; i < 4; i++)
+		le_writel(seckey[i], whc->base + WUSBSECKEY + 4*i);
+	le_writel(setkeycmd, whc->base + WUSBSETSECKEYCMD);
+
+	ret = whci_wait_for(&whc->umc->dev, whc->base + WUSBSETSECKEYCMD,
+			    WUSBSETSECKEYCMD_SET, 0, 100, "set key");
+
+	return ret;
+}
+
+/**
+ * whc_set_ptk - set the PTK to use for a device.
+ *
+ * The index into the key table for this PTK is the same as the
+ * device's port index.
+ */
+int whc_set_ptk(struct wusbhc *wusbhc, u8 port_idx, u32 tkid,
+		const void *ptk, size_t key_size)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	struct di_buf_entry *di = &whc->di_buf[port_idx];
+	int ret;
+
+	mutex_lock(&whc->mutex);
+
+	if (ptk) {
+		ret = whc_set_key(whc, port_idx, tkid, ptk, key_size, false);
+		if (ret)
+			goto out;
+
+		di->addr_sec_info &= ~WHC_DI_KEY_IDX_MASK;
+		di->addr_sec_info |= WHC_DI_SECURE | WHC_DI_KEY_IDX(port_idx);
+	} else
+		di->addr_sec_info &= ~WHC_DI_SECURE;
+
+	ret = whc_update_di(whc, port_idx);
+out:
+	mutex_unlock(&whc->mutex);
+	return ret;
+}
+
+/**
+ * whc_set_gtk - set the GTK for subsequent broadcast packets
+ *
+ * The GTK is stored in the last entry in the key table (the previous
+ * N_DEVICES entries are for the per-device PTKs).
+ */
+int whc_set_gtk(struct wusbhc *wusbhc, u32 tkid,
+		const void *gtk, size_t key_size)
+{
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	int ret;
+
+	mutex_lock(&whc->mutex);
+
+	ret = whc_set_key(whc, whc->n_devices, tkid, gtk, key_size, true);
+
+	mutex_unlock(&whc->mutex);
+
+	return ret;
+}
+
+int whc_set_cluster_id(struct whc *whc, u8 bcid)
+{
+	whc_write_wusbcmd(whc, WUSBCMD_BCID_MASK, WUSBCMD_BCID(bcid));
+	return 0;
+}