/* * 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 #include #include #include #include #include #define ULPI_VIEW_WAKEUP (1 << 31) #define ULPI_VIEW_RUN (1 << 30) #define ULPI_VIEW_WRITE (1 << 29) #define ULPI_VIEW_READ (0 << 29) #define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16) #define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff) #define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff) static int ulpi_viewport_wait(void __iomem *view, u32 mask) { unsigned long usec = 2000; while (usec--) { if (!(readl(view) & mask)) return 0; udelay(1); } return -ETIMEDOUT; } static int ulpi_viewport_read(struct usb_phy *otg, u32 reg) { int ret; void __iomem *view = otg->io_priv; writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); if (ret) return ret; writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view); ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN); if (ret) return ret; return ULPI_VIEW_DATA_READ(readl(view)); } static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg) { int ret; void __iomem *view = otg->io_priv; writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); if (ret) return ret; writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) | ULPI_VIEW_ADDR(reg), view); return ulpi_viewport_wait(view, ULPI_VIEW_RUN); } struct usb_phy_io_ops ulpi_viewport_access_ops = { .read = ulpi_viewport_read, .write = ulpi_viewport_write, }; EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops); a>

path: root/drivers/usb/misc/appledisplay.c

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