platform: msm_shared: Add qusb2 phy reset function
Platform msmzirc has qusb2 phy which has similar reset sequence with
qusb2 phy of msm8994. Make a function to perform qusb2 phy reset from
target init.
Change-Id: I95a2b82542a7bbd78ee912edd6d228a45664a78c
diff --git a/platform/msm_shared/qusb2_phy.c b/platform/msm_shared/qusb2_phy.c
new file mode 100644
index 0000000..8e59579
--- /dev/null
+++ b/platform/msm_shared/qusb2_phy.c
@@ -0,0 +1,51 @@
+/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Foundation. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <platform/iomap.h>
+#include <reg.h>
+#include <bits.h>
+#include <debug.h>
+
+void qusb2_phy_reset(void)
+{
+ uint32_t val;
+
+ /* Block Reset */
+ val = readl(GCC_QUSB2_PHY_BCR) | BIT(0);
+ writel(val, GCC_QUSB2_PHY_BCR);
+ udelay(10);
+ writel(val & ~BIT(0), GCC_QUSB2_PHY_BCR);
+
+ /* Deassert POWERDOWN by clearing bit 0 to enable the PHY */
+ val = readl(QUSB2PHY_PORT_POWERDOWN);
+ writel(val & ~BIT(0), QUSB2PHY_PORT_POWERDOWN);
+ udelay(10);
+
+ /* set CLAMP_N_EN and FREEZIO_N */
+ writel(0x22, QUSB2PHY_PORT_POWERDOWN);
+}