linux/lib/iomap_copy.c
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   1/*
   2 * Copyright 2006 PathScale, Inc.  All Rights Reserved.
   3 *
   4 * This file is free software; you can redistribute it and/or modify
   5 * it under the terms of version 2 of the GNU General Public License
   6 * as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software Foundation,
  15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  16 */
  17
  18#include <linux/export.h>
  19#include <linux/io.h>
  20
  21/**
  22 * __iowrite32_copy - copy data to MMIO space, in 32-bit units
  23 * @to: destination, in MMIO space (must be 32-bit aligned)
  24 * @from: source (must be 32-bit aligned)
  25 * @count: number of 32-bit quantities to copy
  26 *
  27 * Copy data from kernel space to MMIO space, in units of 32 bits at a
  28 * time.  Order of access is not guaranteed, nor is a memory barrier
  29 * performed afterwards.
  30 */
  31void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
  32                                            const void *from,
  33                                            size_t count)
  34{
  35        u32 __iomem *dst = to;
  36        const u32 *src = from;
  37        const u32 *end = src + count;
  38
  39        while (src < end)
  40                __raw_writel(*src++, dst++);
  41}
  42EXPORT_SYMBOL_GPL(__iowrite32_copy);
  43
  44/**
  45 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
  46 * @to: destination, in MMIO space (must be 64-bit aligned)
  47 * @from: source (must be 64-bit aligned)
  48 * @count: number of 64-bit quantities to copy
  49 *
  50 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
  51 * time.  Order of access is not guaranteed, nor is a memory barrier
  52 * performed afterwards.
  53 */
  54void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
  55                                            const void *from,
  56                                            size_t count)
  57{
  58#ifdef CONFIG_64BIT
  59        u64 __iomem *dst = to;
  60        const u64 *src = from;
  61        const u64 *end = src + count;
  62
  63        while (src < end)
  64                __raw_writeq(*src++, dst++);
  65#else
  66        __iowrite32_copy(to, from, count * 2);
  67#endif
  68}
  69
  70EXPORT_SYMBOL_GPL(__iowrite64_copy);
  71
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