Line data    Source code

       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           0 : 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           0 :         const u32 *end = src + count;
      38             : 
      39           0 :         while (src < end)
      40           0 :                 __raw_writel(*src++, dst++);
      41           0 : }
      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           0 : 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           0 :         __iowrite32_copy(to, from, count * 2);
      67             : #endif
      68           0 : }
      69             : 
      70             : EXPORT_SYMBOL_GPL(__iowrite64_copy);