cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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phy-ulpi-viewport.c (1671B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2011 Google, Inc.
      4 */
      5
      6#include <linux/export.h>
      7#include <linux/kernel.h>
      8#include <linux/usb.h>
      9#include <linux/io.h>
     10#include <linux/iopoll.h>
     11#include <linux/usb/otg.h>
     12#include <linux/usb/ulpi.h>
     13
     14#define ULPI_VIEW_WAKEUP	(1 << 31)
     15#define ULPI_VIEW_RUN		(1 << 30)
     16#define ULPI_VIEW_WRITE		(1 << 29)
     17#define ULPI_VIEW_READ		(0 << 29)
     18#define ULPI_VIEW_ADDR(x)	(((x) & 0xff) << 16)
     19#define ULPI_VIEW_DATA_READ(x)	(((x) >> 8) & 0xff)
     20#define ULPI_VIEW_DATA_WRITE(x)	((x) & 0xff)
     21
     22static int ulpi_viewport_wait(void __iomem *view, u32 mask)
     23{
     24	u32 val;
     25
     26	return readl_poll_timeout_atomic(view, val, !(val & mask), 1, 2000);
     27}
     28
     29static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
     30{
     31	int ret;
     32	void __iomem *view = otg->io_priv;
     33
     34	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
     35	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
     36	if (ret)
     37		return ret;
     38
     39	writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
     40	ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN);
     41	if (ret)
     42		return ret;
     43
     44	return ULPI_VIEW_DATA_READ(readl(view));
     45}
     46
     47static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg)
     48{
     49	int ret;
     50	void __iomem *view = otg->io_priv;
     51
     52	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
     53	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
     54	if (ret)
     55		return ret;
     56
     57	writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
     58						 ULPI_VIEW_ADDR(reg), view);
     59
     60	return ulpi_viewport_wait(view, ULPI_VIEW_RUN);
     61}
     62
     63struct usb_phy_io_ops ulpi_viewport_access_ops = {
     64	.read	= ulpi_viewport_read,
     65	.write	= ulpi_viewport_write,
     66};
     67EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);