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
17#define USB3_MAX_WINDOWS	4
18#define USB3_WIN_CTRL(w)	(0x0 + ((w) * 8))
19#define USB3_WIN_BASE(w)	(0x4 + ((w) * 8))
20
21static void xhci_mvebu_mbus_config(void __iomem *base,
22			const struct mbus_dram_target_info *dram)
23{
24	int win;
25
26	/* Clear all existing windows */
27	for (win = 0; win < USB3_MAX_WINDOWS; win++) {
28		writel(0, base + USB3_WIN_CTRL(win));
29		writel(0, base + USB3_WIN_BASE(win));
30	}
31
32	/* Program each DRAM CS in a seperate window */
33	for (win = 0; win < dram->num_cs; win++) {
34		const struct mbus_dram_window *cs = dram->cs + win;
35
36		writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
37		       (dram->mbus_dram_target_id << 4) | 1,
38		       base + USB3_WIN_CTRL(win));
39
40		writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
41	}
42}
43
44int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
45{
46	struct device *dev = hcd->self.controller;
47	struct platform_device *pdev = to_platform_device(dev);
48	struct resource	*res;
49	void __iomem *base;
50	const struct mbus_dram_target_info *dram;
51
52	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
53	if (!res)
54		return -ENODEV;
55
56	/*
57	 * We don't use devm_ioremap() because this mapping should
58	 * only exists for the duration of this probe function.
59	 */
60	base = ioremap(res->start, resource_size(res));
61	if (!base)
62		return -ENODEV;
63
64	dram = mv_mbus_dram_info();
65	xhci_mvebu_mbus_config(base, dram);
66
67	/*
68	 * This memory area was only needed to configure the MBus
69	 * windows, and is therefore no longer useful.
70	 */
71	iounmap(base);
72
73	return 0;
74}