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 | |
22 | static 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 | |
45 | int 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 | |
77 | int 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 | |