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67 lines
1.6 KiB
67 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2011 Google, Inc. |
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*/ |
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <linux/usb.h> |
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#include <linux/io.h> |
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#include <linux/iopoll.h> |
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#include <linux/usb/otg.h> |
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#include <linux/usb/ulpi.h> |
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#define ULPI_VIEW_WAKEUP (1 << 31) |
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#define ULPI_VIEW_RUN (1 << 30) |
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#define ULPI_VIEW_WRITE (1 << 29) |
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#define ULPI_VIEW_READ (0 << 29) |
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#define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16) |
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#define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff) |
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#define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff) |
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static int ulpi_viewport_wait(void __iomem *view, u32 mask) |
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{ |
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u32 val; |
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return readl_poll_timeout_atomic(view, val, !(val & mask), 1, 2000); |
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} |
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static int ulpi_viewport_read(struct usb_phy *otg, u32 reg) |
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{ |
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int ret; |
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void __iomem *view = otg->io_priv; |
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writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); |
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ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); |
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if (ret) |
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return ret; |
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writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view); |
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ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN); |
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if (ret) |
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return ret; |
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return ULPI_VIEW_DATA_READ(readl(view)); |
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} |
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static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg) |
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{ |
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int ret; |
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void __iomem *view = otg->io_priv; |
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writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); |
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ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); |
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if (ret) |
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return ret; |
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writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) | |
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ULPI_VIEW_ADDR(reg), view); |
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return ulpi_viewport_wait(view, ULPI_VIEW_RUN); |
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} |
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struct usb_phy_io_ops ulpi_viewport_access_ops = { |
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.read = ulpi_viewport_read, |
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.write = ulpi_viewport_write, |
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}; |
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EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);
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