wl1271: add wl1271 driver files

This driver supports the wl1271 chipset from Texas Instruments based on the
WiLink(tm) 6.0 mobile platform.  Support for wl1273 should be relatively easy
to add.  This chipset is designed for embedded devices, with good powersaving
capabilities.  The wl1271 chipset is the successor of wl1251 and supports the
802.11b/g/n standards, but currently this driver supports only b/g.

More information about this chipset can be found here:
http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?templateId=6123&navigationId=12762&contentId=29993

Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_ps.c b/drivers/net/wireless/wl12xx/wl1271_ps.c
new file mode 100644
index 0000000..1dc74b0
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_ps.c
@@ -0,0 +1,142 @@
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Contact: Luciano Coelho <luciano.coelho@nokia.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include "wl1271_reg.h"
+#include "wl1271_ps.h"
+#include "wl1271_spi.h"
+
+#define WL1271_WAKEUP_TIMEOUT 500
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1271_ps_elp_sleep(struct wl1271 *wl)
+{
+	/*
+	 * FIXME: due to a problem in the firmware (causing a firmware
+	 * crash), ELP entry is prevented below. Remove the "true" to
+	 * re-enable ELP entry.
+	 */
+	if (true || wl->elp || !wl->psm)
+		return;
+
+	/*
+	 * Go to ELP unless there is work already pending - pending work
+	 * will immediately wakeup the chipset anyway.
+	 */
+	if (!work_pending(&wl->irq_work) && !work_pending(&wl->tx_work)) {
+		wl1271_debug(DEBUG_PSM, "chip to elp");
+		wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+		wl->elp = true;
+	}
+}
+
+int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
+{
+	DECLARE_COMPLETION_ONSTACK(compl);
+	unsigned long flags;
+	int ret;
+	u32 start_time = jiffies;
+	bool pending = false;
+
+	if (!wl->elp)
+		return 0;
+
+	wl1271_debug(DEBUG_PSM, "waking up chip from elp");
+
+	/*
+	 * The spinlock is required here to synchronize both the work and
+	 * the completion variable in one entity.
+	 */
+	spin_lock_irqsave(&wl->wl_lock, flags);
+	if (work_pending(&wl->irq_work) || chip_awake)
+		pending = true;
+	else
+		wl->elp_compl = &compl;
+	spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+	wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+	if (!pending) {
+		ret = wait_for_completion_timeout(
+			&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
+		if (ret == 0) {
+			wl1271_error("ELP wakeup timeout!");
+			ret = -ETIMEDOUT;
+			goto err;
+		} else if (ret < 0) {
+			wl1271_error("ELP wakeup completion error.");
+			goto err;
+		}
+	}
+
+	wl->elp = false;
+
+	wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
+		     jiffies_to_msecs(jiffies - start_time));
+	goto out;
+
+err:
+	spin_lock_irqsave(&wl->wl_lock, flags);
+	wl->elp_compl = NULL;
+	spin_unlock_irqrestore(&wl->wl_lock, flags);
+	return ret;
+
+out:
+	return 0;
+}
+
+int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode)
+{
+	int ret;
+
+	switch (mode) {
+	case STATION_POWER_SAVE_MODE:
+		wl1271_debug(DEBUG_PSM, "entering psm");
+		ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+		if (ret < 0)
+			return ret;
+
+		wl1271_ps_elp_sleep(wl);
+		if (ret < 0)
+			return ret;
+
+		wl->psm = 1;
+		break;
+	case STATION_ACTIVE_MODE:
+	default:
+		wl1271_debug(DEBUG_PSM, "leaving psm");
+		ret = wl1271_ps_elp_wakeup(wl, false);
+		if (ret < 0)
+			return ret;
+
+		ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+		if (ret < 0)
+			return ret;
+
+		wl->psm = 0;
+		break;
+	}
+
+	return ret;
+}
+
+