lib/iomap_copy.c

   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  */
  31 void __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 }
  42 EXPORT_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  */
  54 void __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
  70 EXPORT_SYMBOL_GPL(__iowrite64_copy);