MXC: Add support for ULPI Viewports
The ARC USB OTG Core has support for accessing ULPI tranceivers
through so called ULPI viewports. Export a set of function for use with
the USB OTG framework.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/ulpi.c b/arch/arm/plat-mxc/ulpi.c
new file mode 100644
index 0000000..582c6df
--- /dev/null
+++ b/arch/arm/plat-mxc/ulpi.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+ * Copyright 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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 Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/usb/otg.h>
+
+#include <mach/ulpi.h>
+
+/* ULPIVIEW register bits */
+#define ULPIVW_WU (1 << 31) /* Wakeup */
+#define ULPIVW_RUN (1 << 30) /* read/write run */
+#define ULPIVW_WRITE (1 << 29) /* 0 = read 1 = write */
+#define ULPIVW_SS (1 << 27) /* SyncState */
+#define ULPIVW_PORT_MASK 0x07 /* Port field */
+#define ULPIVW_PORT_SHIFT 24
+#define ULPIVW_ADDR_MASK 0xff /* data address field */
+#define ULPIVW_ADDR_SHIFT 16
+#define ULPIVW_RDATA_MASK 0xff /* read data field */
+#define ULPIVW_RDATA_SHIFT 8
+#define ULPIVW_WDATA_MASK 0xff /* write data field */
+#define ULPIVW_WDATA_SHIFT 0
+
+static int ulpi_poll(void __iomem *view, u32 bit)
+{
+ int timeout = 10000;
+
+ while (timeout--) {
+ u32 data = __raw_readl(view);
+
+ if (!(data & bit))
+ return 0;
+
+ cpu_relax();
+ };
+
+ printk(KERN_WARNING "timeout polling for ULPI device\n");
+
+ return -ETIMEDOUT;
+}
+
+static int ulpi_read(struct otg_transceiver *otg, u32 reg)
+{
+ int ret;
+ void __iomem *view = otg->io_priv;
+
+ /* make sure interface is running */
+ if (!(__raw_readl(view) & ULPIVW_SS)) {
+ __raw_writel(ULPIVW_WU, view);
+
+ /* wait for wakeup */
+ ret = ulpi_poll(view, ULPIVW_WU);
+ if (ret)
+ return ret;
+ }
+
+ /* read the register */
+ __raw_writel((ULPIVW_RUN | (reg << ULPIVW_ADDR_SHIFT)), view);
+
+ /* wait for completion */
+ ret = ulpi_poll(view, ULPIVW_RUN);
+ if (ret)
+ return ret;
+
+ return (__raw_readl(view) >> ULPIVW_RDATA_SHIFT) & ULPIVW_RDATA_MASK;
+}
+
+static int ulpi_write(struct otg_transceiver *otg, u32 val, u32 reg)
+{
+ int ret;
+ void __iomem *view = otg->io_priv;
+
+ /* make sure the interface is running */
+ if (!(__raw_readl(view) & ULPIVW_SS)) {
+ __raw_writel(ULPIVW_WU, view);
+ /* wait for wakeup */
+ ret = ulpi_poll(view, ULPIVW_WU);
+ if (ret)
+ return ret;
+ }
+
+ __raw_writel((ULPIVW_RUN | ULPIVW_WRITE |
+ (reg << ULPIVW_ADDR_SHIFT) |
+ ((val & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), view);
+
+ /* wait for completion */
+ return ulpi_poll(view, ULPIVW_RUN);
+}
+
+struct otg_io_access_ops mxc_ulpi_access_ops = {
+ .read = ulpi_read,
+ .write = ulpi_write,
+};
+EXPORT_SYMBOL_GPL(mxc_ulpi_access_ops);
+