drivers/usb/dwc3/io.h

   1 /**
   2  * io.h - DesignWare USB3 DRD IO Header
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #ifndef __DRIVERS_USB_DWC3_IO_H
  20 #define __DRIVERS_USB_DWC3_IO_H
  21
  22 #include <linux/io.h>
  23 #include "trace.h"
  24 #include "debug.h"
  25 #include "core.h"
  26
  27 static inline u32 dwc3_readl(void __iomem *base, u32 offset)
  28 {
  29         u32 value;
  30
  31         /*
  32          * We requested the mem region starting from the Globals address
  33          * space, see dwc3_probe in core.c.
  34          * However, the offsets are given starting from xHCI address space.
  35          */
  36         value = readl(base + offset - DWC3_GLOBALS_REGS_START);
  37
  38         /*
  39          * When tracing we want to make it easy to find the correct address on
  40          * documentation, so we revert it back to the proper addresses, the
  41          * same way they are described on SNPS documentation
  42          */
  43         trace_dwc3_readl(base - DWC3_GLOBALS_REGS_START, offset, value);
  44
  45         return value;
  46 }
  47
  48 static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
  49 {
  50         /*
  51          * We requested the mem region starting from the Globals address
  52          * space, see dwc3_probe in core.c.
  53          * However, the offsets are given starting from xHCI address space.
  54          */
  55         writel(value, base + offset - DWC3_GLOBALS_REGS_START);
  56
  57         /*
  58          * When tracing we want to make it easy to find the correct address on
  59          * documentation, so we revert it back to the proper addresses, the
  60          * same way they are described on SNPS documentation
  61          */
  62         trace_dwc3_writel(base - DWC3_GLOBALS_REGS_START, offset, value);
  63 }
  64
  65 #endif /* __DRIVERS_USB_DWC3_IO_H */