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}