release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/infiniband/hw/qib/qib_pio_copy.c

   1 /*
   2  * Copyright (c) 2009 QLogic Corporation. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include "qib.h"
  34
  35 /**
  36  * qib_pio_copy - copy data to MMIO space, in multiples of 32-bits
  37  * @to: destination, in MMIO space (must be 64-bit aligned)
  38  * @from: source (must be 64-bit aligned)
  39  * @count: number of 32-bit quantities to copy
  40  *
  41  * Copy data from kernel space to MMIO space, in multiples of 32 bits at a
  42  * time.  Order of access is not guaranteed, nor is a memory barrier
  43  * performed afterwards.
  44  */
  45 void qib_pio_copy(void __iomem *to, const void *from, size_t count)
  46 {
  47 #ifdef CONFIG_64BIT
  48         u64 __iomem *dst = to;
  49         const u64 *src = from;
  50         const u64 *end = src + (count >> 1);
  51
  52         while (src < end)
  53                 __raw_writeq(*src++, dst++);
  54         if (count & 1)
  55                 __raw_writel(*(const u32 *)src, dst);
  56 #else
  57         u32 __iomem *dst = to;
  58         const u32 *src = from;
  59         const u32 *end = src + count;
  60
  61         while (src < end)
  62                 __raw_writel(*src++, dst++);
  63 #endif
  64 }