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+/*
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+ * OMAP ulpi viewport support
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+ * Based on drivers/usb/ulpi/ulpi-viewport.c
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+ *
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+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
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+ * Author: Govindraj R <govindraj.raja@ti.com>
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 of
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+ * the License as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <common.h>
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+#include <asm/io.h>
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+#include <usb/ulpi.h>
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+
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+#define OMAP_ULPI_WR_OPSEL (3 << 21)
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+#define OMAP_ULPI_ACCESS (1 << 31)
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+
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+/*
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+ * Wait for the ULPI Access to complete
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+ */
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+static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
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+{
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+ int timeout = CONFIG_USB_ULPI_TIMEOUT;
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+
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+ while (--timeout) {
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+ if ((readl(ulpi_vp->viewport_addr) & mask))
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+ return 0;
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+
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+ udelay(1);
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+ }
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+
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+ return ULPI_ERROR;
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+}
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+
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+/*
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+ * Wake the ULPI PHY up for communication
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+ *
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+ * returns 0 on success.
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+ */
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+static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
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+{
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+ int err;
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+
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+ if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS)
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+ return 0; /* already awake */
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+
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+ writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr);
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+
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+ err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
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+ if (err)
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+ debug("ULPI wakeup timed out\n");
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+
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+ return err;
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+}
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+
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+/*
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+ * Issue a ULPI read/write request
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+ */
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+static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
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+{
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+ int err;
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+
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+ err = ulpi_wakeup(ulpi_vp);
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+ if (err)
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+ return err;
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+
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+ writel(value, ulpi_vp->viewport_addr);
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+
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+ err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
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+ if (err)
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+ debug("ULPI request timed out\n");
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+
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+ return err;
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+}
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+
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+int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
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+{
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+ u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
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+ OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
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+
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+ return ulpi_request(ulpi_vp, val);
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+}
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+
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+u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
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+{
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+ int err;
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+ u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
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+ OMAP_ULPI_WR_OPSEL | ((u32)reg << 16);
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+
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+ err = ulpi_request(ulpi_vp, val);
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+ if (err)
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+ return err;
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+
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+ return readl(ulpi_vp->viewport_addr) & 0xff;
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+}
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