From 7e6133aa42920ea87ad9791a0fb2b95d1a23b8f9 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@csr.com>
Date: Wed, 17 Sep 2008 16:34:28 +0100
Subject: 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>
---
 drivers/usb/host/whci/hw.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 drivers/usb/host/whci/hw.c

(limited to 'drivers/usb/host/whci/hw.c')

diff --git a/drivers/usb/host/whci/hw.c b/drivers/usb/host/whci/hw.c
new file mode 100644
index 0000000..ac86e59
--- /dev/null
+++ b/drivers/usb/host/whci/hw.c
@@ -0,0 +1,87 @@
+/*
+ * Wireless Host Controller (WHC) hardware access helpers.
+ *
+ * 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/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/uwb/umc.h>
+
+#include "../../wusbcore/wusbhc.h"
+
+#include "whcd.h"
+
+void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
+{
+	unsigned long flags;
+	u32 cmd;
+
+	spin_lock_irqsave(&whc->lock, flags);
+
+	cmd = le_readl(whc->base + WUSBCMD);
+	cmd = (cmd & ~mask) | val;
+	le_writel(cmd, whc->base + WUSBCMD);
+
+	spin_unlock_irqrestore(&whc->lock, flags);
+}
+
+/**
+ * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
+ * @whc:    the WHCI HC
+ * @cmd:    command to start.
+ * @params: parameters for the command (the WUSBGENCMDPARAMS register value).
+ * @addr:   pointer to any data for the command (may be NULL).
+ * @len:    length of the data (if any).
+ */
+int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
+{
+	unsigned long flags;
+	dma_addr_t dma_addr;
+	int t;
+
+	mutex_lock(&whc->mutex);
+
+	/* Wait for previous command to complete. */
+	t = wait_event_timeout(whc->cmd_wq,
+			       (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
+			       WHC_GENCMD_TIMEOUT_MS);
+	if (t == 0) {
+		dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
+			le_readl(whc->base + WUSBGENCMDSTS),
+			le_readl(whc->base + WUSBGENCMDPARAMS));
+		return -ETIMEDOUT;
+	}
+
+	if (addr) {
+		memcpy(whc->gen_cmd_buf, addr, len);
+		dma_addr = whc->gen_cmd_buf_dma;
+	} else
+		dma_addr = 0;
+
+	/* Poke registers to start cmd. */
+	spin_lock_irqsave(&whc->lock, flags);
+
+	le_writel(params, whc->base + WUSBGENCMDPARAMS);
+	le_writeq(dma_addr, whc->base + WUSBGENADDR);
+
+	le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
+		  whc->base + WUSBGENCMDSTS);
+
+	spin_unlock_irqrestore(&whc->lock, flags);
+
+	mutex_unlock(&whc->mutex);
+
+	return 0;
+}
-- 
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