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(val: 0, addr: base + USB3_WIN_CTRL(win));
30 writel(val: 0, addr: 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(val: ((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
38 (dram->mbus_dram_target_id << 4) | 1,
39 addr: base + USB3_WIN_CTRL(win));
40
41 writel(val: (cs->base & 0xffff0000), addr: 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(offset: res->start, size: 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(addr: 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}
86

source code of linux/drivers/usb/host/xhci-mvebu.c