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>
diff --git a/drivers/net/wireless/wl12xx/ps.c b/drivers/net/wireless/wl12xx/ps.c
new file mode 100644
index 0000000..83a1011
--- /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;
+}
+