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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xhci-mvebu.c (2051B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2014 Marvell
      4 * Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
      5 */
      6
      7#include <linux/io.h>
      8#include <linux/mbus.h>
      9#include <linux/of.h>
     10#include <linux/platform_device.h>
     11
     12#include <linux/usb.h>
     13#include <linux/usb/hcd.h>
     14
     15#include "xhci-mvebu.h"
     16#include "xhci.h"
     17
     18#define USB3_MAX_WINDOWS	4
     19#define USB3_WIN_CTRL(w)	(0x0 + ((w) * 8))
     20#define USB3_WIN_BASE(w)	(0x4 + ((w) * 8))
     21
     22static void xhci_mvebu_mbus_config(void __iomem *base,
     23			const struct mbus_dram_target_info *dram)
     24{
     25	int win;
     26
     27	/* Clear all existing windows */
     28	for (win = 0; win < USB3_MAX_WINDOWS; win++) {
     29		writel(0, base + USB3_WIN_CTRL(win));
     30		writel(0, base + USB3_WIN_BASE(win));
     31	}
     32
     33	/* Program each DRAM CS in a seperate window */
     34	for (win = 0; win < dram->num_cs; win++) {
     35		const struct mbus_dram_window *cs = dram->cs + win;
     36
     37		writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
     38		       (dram->mbus_dram_target_id << 4) | 1,
     39		       base + USB3_WIN_CTRL(win));
     40
     41		writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
     42	}
     43}
     44
     45int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
     46{
     47	struct device *dev = hcd->self.controller;
     48	struct platform_device *pdev = to_platform_device(dev);
     49	struct resource	*res;
     50	void __iomem *base;
     51	const struct mbus_dram_target_info *dram;
     52
     53	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
     54	if (!res)
     55		return -ENODEV;
     56
     57	/*
     58	 * We don't use devm_ioremap() because this mapping should
     59	 * only exists for the duration of this probe function.
     60	 */
     61	base = ioremap(res->start, resource_size(res));
     62	if (!base)
     63		return -ENODEV;
     64
     65	dram = mv_mbus_dram_info();
     66	xhci_mvebu_mbus_config(base, dram);
     67
     68	/*
     69	 * This memory area was only needed to configure the MBus
     70	 * windows, and is therefore no longer useful.
     71	 */
     72	iounmap(base);
     73
     74	return 0;
     75}
     76
     77int xhci_mvebu_a3700_init_quirk(struct usb_hcd *hcd)
     78{
     79	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
     80
     81	/* Without reset on resume, the HC won't work at all */
     82	xhci->quirks |= XHCI_RESET_ON_RESUME;
     83
     84	return 0;
     85}