xref: /linux/drivers/usb/host/xhci-mvebu.c (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)
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 
xhci_mvebu_mbus_config(void __iomem * base,const struct mbus_dram_target_info * dram)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(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 
xhci_mvebu_mbus_init_quirk(struct usb_hcd * hcd)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(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 
xhci_mvebu_a3700_init_quirk(struct usb_hcd * hcd)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