1 // SPDX-License-Identifier: GPL-2.0
2 /**
3 * io.h - DesignWare USB3 DRD IO Header
4 *
5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
6 *
7 * Authors: Felipe Balbi <balbi@ti.com>,
8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
9 */
10
11 #ifndef __DRIVERS_USB_DWC3_IO_H
12 #define __DRIVERS_USB_DWC3_IO_H
13
14 #include <linux/io.h>
15 #include "trace.h"
16 #include "debug.h"
17 #include "core.h"
18
19 static inline u32 dwc3_readl(void __iomem *base, u32 offset)
20 {
21 u32 value;
22
23 /*
24 * We requested the mem region starting from the Globals address
25 * space, see dwc3_probe in core.c.
26 * However, the offsets are given starting from xHCI address space.
27 */
28 value = readl(base + offset - DWC3_GLOBALS_REGS_START);
29
30 /*
31 * When tracing we want to make it easy to find the correct address on
32 * documentation, so we revert it back to the proper addresses, the
33 * same way they are described on SNPS documentation
34 */
35 trace_dwc3_readl(base - DWC3_GLOBALS_REGS_START, offset, value);
36
37 return value;
38 }
39
40 static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
41 {
42 /*
43 * We requested the mem region starting from the Globals address
44 * space, see dwc3_probe in core.c.
45 * However, the offsets are given starting from xHCI address space.
46 */
47 writel(value, base + offset - DWC3_GLOBALS_REGS_START);
48
49 /*
50 * When tracing we want to make it easy to find the correct address on
51 * documentation, so we revert it back to the proper addresses, the
52 * same way they are described on SNPS documentation
53 */
54 trace_dwc3_writel(base - DWC3_GLOBALS_REGS_START, offset, value);
55 }
56
57 #endif /* __DRIVERS_USB_DWC3_IO_H */