USB: Add generic ULPI layer and a viewport
Add partial ULPI specification implementation that should be enough to
interface the ULPI PHYs in the boot loader context.
Add a viewport implementation for Chipidea/ARC based controllers.
Signed-off-by: Jana Rapava <fermata7@gmail.com>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Cc: Remy Bohmer <linux@bohmer.net>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Grandegger <wg@denx.de>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/ulpi/ulpi-viewport.c b/drivers/usb/ulpi/ulpi-viewport.c
new file mode 100644
index 0000000..fa2e004
--- /dev/null
+++ b/drivers/usb/ulpi/ulpi-viewport.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
+ * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
+ *
+ * Authors: Jana Rapava <fermata7@gmail.com>
+ * Igor Grinberg <grinberg@compulab.co.il>
+ *
+ * Based on:
+ * linux/drivers/usb/otg/ulpi_viewport.c
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <usb/ulpi.h>
+
+/* ULPI viewport control bits */
+#define ULPI_SS (1 << 27)
+#define ULPI_RWCTRL (1 << 29)
+#define ULPI_RWRUN (1 << 30)
+#define ULPI_WU (1 << 31)
+
+/*
+ * Wait for the ULPI request to complete
+ *
+ * @ulpi_viewport - the address of the viewport
+ * @mask - expected value to wait for
+ *
+ * returns 0 on mask match, ULPI_ERROR on time out.
+ */
+static int ulpi_wait(u32 ulpi_viewport, u32 mask)
+{
+ int timeout = CONFIG_USB_ULPI_TIMEOUT;
+
+ /* Wait for the bits in mask to become zero. */
+ while (--timeout) {
+ if ((readl(ulpi_viewport) & mask) == 0)
+ return 0;
+
+ udelay(1);
+ }
+
+ return ULPI_ERROR;
+}
+
+/*
+ * Wake the ULPI PHY up for communication
+ *
+ * returns 0 on success.
+ */
+static int ulpi_wakeup(u32 ulpi_viewport)
+{
+ int err;
+
+ if (readl(ulpi_viewport) & ULPI_SS)
+ return 0; /* already awake */
+
+ writel(ULPI_WU, ulpi_viewport);
+
+ err = ulpi_wait(ulpi_viewport, ULPI_WU);
+ if (err)
+ printf("ULPI wakeup timed out\n");
+
+ return err;
+}
+
+/*
+ * Issue a ULPI read/write request
+ *
+ * @value - the ULPI request
+ */
+static int ulpi_request(u32 ulpi_viewport, u32 value)
+{
+ int err;
+
+ err = ulpi_wakeup(ulpi_viewport);
+ if (err)
+ return err;
+
+ writel(value, ulpi_viewport);
+
+ err = ulpi_wait(ulpi_viewport, ULPI_RWRUN);
+ if (err)
+ printf("ULPI request timed out\n");
+
+ return err;
+}
+
+u32 ulpi_write(u32 ulpi_viewport, u8 *reg, u32 value)
+{
+ u32 val = ULPI_RWRUN | ULPI_RWCTRL | ((u32)reg << 16) | (value & 0xff);
+
+ return ulpi_request(ulpi_viewport, val);
+}
+
+u32 ulpi_read(u32 ulpi_viewport, u8 *reg)
+{
+ u32 err;
+ u32 val = ULPI_RWRUN | ((u32)reg << 16);
+
+ err = ulpi_request(ulpi_viewport, val);
+ if (err)
+ return err;
+
+ return (readl(ulpi_viewport) >> 8) & 0xff;
+}