drivers/usb/dwc3/io.h

   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  * This program is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2  of
  12  * the License as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #ifndef __DRIVERS_USB_DWC3_IO_H
  21 #define __DRIVERS_USB_DWC3_IO_H
  22
  23 #include <linux/io.h>
  24 #include "trace.h"
  25 #include "debug.h"
  26 #include "core.h"
  27
  28 static inline u32 dwc3_readl(void __iomem *base, u32 offset)
  29 {
  30         u32 value;
  31
  32         /*
  33          * We requested the mem region starting from the Globals address
  34          * space, see dwc3_probe in core.c.
  35          * However, the offsets are given starting from xHCI address space.
  36          */
  37         value = readl(base + offset - DWC3_GLOBALS_REGS_START);
  38
  39         /*
  40          * When tracing we want to make it easy to find the correct address on
  41          * documentation, so we revert it back to the proper addresses, the
  42          * same way they are described on SNPS documentation
  43          */
  44         trace_dwc3_readl(base - DWC3_GLOBALS_REGS_START, offset, value);
  45
  46         return value;
  47 }
  48
  49 static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
  50 {
  51         /*
  52          * We requested the mem region starting from the Globals address
  53          * space, see dwc3_probe in core.c.
  54          * However, the offsets are given starting from xHCI address space.
  55          */
  56         writel(value, base + offset - DWC3_GLOBALS_REGS_START);
  57
  58         /*
  59          * When tracing we want to make it easy to find the correct address on
  60          * documentation, so we revert it back to the proper addresses, the
  61          * same way they are described on SNPS documentation
  62          */
  63         trace_dwc3_writel(base - DWC3_GLOBALS_REGS_START, offset, value);
  64 }
  65
  66 #endif /* __DRIVERS_USB_DWC3_IO_H */