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fb3967b95c
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
// 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/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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unsigned long usec = 2000;
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while (usec--) {
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if (!(readl(view) & mask))
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return 0;
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udelay(1);
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}
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return -ETIMEDOUT;
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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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