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 offs = offset - DWC3_GLOBALS_REGS_START;
  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 + offs);
  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         dwc3_trace(trace_dwc3_readl, "addr %p value %08x",
  45                         base - DWC3_GLOBALS_REGS_START + offset, value);
  46
  47         return value;
  48 }
  49
  50 static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
  51 {
  52         u32 offs = offset - DWC3_GLOBALS_REGS_START;
  53
  54         /*
  55          * We requested the mem region starting from the Globals address
  56          * space, see dwc3_probe in core.c.
  57          * However, the offsets are given starting from xHCI address space.
  58          */
  59         writel(value, base + offs);
  60
  61         /*
  62          * When tracing we want to make it easy to find the correct address on
  63          * documentation, so we revert it back to the proper addresses, the
  64          * same way they are described on SNPS documentation
  65          */
  66         dwc3_trace(trace_dwc3_writel, "addr %p value %08x",
  67                         base - DWC3_GLOBALS_REGS_START + offset, value);
  68 }
  69
  70 #endif /* __DRIVERS_USB_DWC3_IO_H */