wl12xx: add driver

wl12xx is a driver for TI wl1251 802.11 chipset designed for embedded
devices, supporting both SDIO and SPI busses. Currently the driver
supports only SPI. Adding support 1253 (the 5 GHz version) should be
relatively easy. More information here:

http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?contentId=4711&navigationId=12494&templateId=6123

(Collapsed original sequence of pre-merge patches into single commit for
initial merge. -- JWL)

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/ps.c b/drivers/net/wireless/wl12xx/ps.c
new file mode 100644
index 000000000000..83a10117330b
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/ps.c
@@ -0,0 +1,151 @@
+/*
+ * This file is part of wl12xx
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Kalle Valo <kalle.valo@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 "reg.h"
+#include "ps.h"
+#include "spi.h"
+
+#define WL12XX_WAKEUP_TIMEOUT 2000
+
+/* Routines to toggle sleep mode while in ELP */
+void wl12xx_ps_elp_sleep(struct wl12xx *wl)
+{
+	if (wl->elp || !wl->psm)
+		return;
+
+	wl12xx_debug(DEBUG_PSM, "chip to elp");
+
+	wl12xx_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+
+	wl->elp = true;
+}
+
+int wl12xx_ps_elp_wakeup(struct wl12xx *wl)
+{
+	unsigned long timeout;
+	u32 elp_reg;
+
+	if (!wl->elp)
+		return 0;
+
+	wl12xx_debug(DEBUG_PSM, "waking up chip from elp");
+
+	timeout = jiffies + msecs_to_jiffies(WL12XX_WAKEUP_TIMEOUT);
+
+	wl12xx_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+	elp_reg = wl12xx_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+
+	/*
+	 * FIXME: we should wait for irq from chip but, as a temporary
+	 * solution to simplify locking, let's poll instead
+	 */
+	while (!(elp_reg & ELPCTRL_WLAN_READY)) {
+		if (time_after(jiffies, timeout)) {
+			wl12xx_error("elp wakeup timeout");
+			return -ETIMEDOUT;
+		}
+		msleep(1);
+		elp_reg = wl12xx_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+	}
+
+	wl12xx_debug(DEBUG_PSM, "wakeup time: %u ms",
+		     jiffies_to_msecs(jiffies) -
+		     (jiffies_to_msecs(timeout) - WL12XX_WAKEUP_TIMEOUT));
+
+	wl->elp = false;
+
+	return 0;
+}
+
+static int wl12xx_ps_set_elp(struct wl12xx *wl, bool enable)
+{
+	int ret;
+
+	if (enable) {
+		wl12xx_debug(DEBUG_PSM, "sleep auth psm/elp");
+
+		/*
+		 * FIXME: we should PSM_ELP, but because of firmware wakeup
+		 * problems let's use only PSM_PS
+		 */
+		ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_PS);
+		if (ret < 0)
+			return ret;
+
+		wl12xx_ps_elp_sleep(wl);
+	} else {
+		wl12xx_debug(DEBUG_PSM, "sleep auth cam");
+
+		/*
+		 * When the target is in ELP, we can only
+		 * access the ELP control register. Thus,
+		 * we have to wake the target up before
+		 * changing the power authorization.
+		 */
+
+		wl12xx_ps_elp_wakeup(wl);
+
+		ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_CAM);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+int wl12xx_ps_set_mode(struct wl12xx *wl, enum acx_ps_mode mode)
+{
+	int ret;
+
+	switch (mode) {
+	case STATION_POWER_SAVE_MODE:
+		wl12xx_debug(DEBUG_PSM, "entering psm");
+		ret = wl12xx_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+		if (ret < 0)
+			return ret;
+
+		ret = wl12xx_ps_set_elp(wl, true);
+		if (ret < 0)
+			return ret;
+
+		wl->psm = 1;
+		break;
+	case STATION_ACTIVE_MODE:
+	default:
+		wl12xx_debug(DEBUG_PSM, "leaving psm");
+		ret = wl12xx_ps_set_elp(wl, false);
+		if (ret < 0)
+			return ret;
+
+		ret = wl12xx_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+		if (ret < 0)
+			return ret;
+
+		wl->psm = 0;
+		break;
+	}
+
+	return ret;
+}
+