LXR linux/drivers/infiniband/hw/qib/qib_pio

   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 */
  45void 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}
  65