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Linux/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  * __ioread32_copy - copy data from MMIO space, in 32-bit units
 46  * @to: destination (must be 32-bit aligned)
 47  * @from: source, in MMIO space (must be 32-bit aligned)
 48  * @count: number of 32-bit quantities to copy
 49  *
 50  * Copy data from MMIO space to kernel space, in units of 32 bits at a
 51  * time.  Order of access is not guaranteed, nor is a memory barrier
 52  * performed afterwards.
 53  */
 54 void __ioread32_copy(void *to, const void __iomem *from, size_t count)
 55 {
 56         u32 *dst = to;
 57         const u32 __iomem *src = from;
 58         const u32 __iomem *end = src + count;
 59 
 60         while (src < end)
 61                 *dst++ = __raw_readl(src++);
 62 }
 63 EXPORT_SYMBOL_GPL(__ioread32_copy);
 64 
 65 /**
 66  * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
 67  * @to: destination, in MMIO space (must be 64-bit aligned)
 68  * @from: source (must be 64-bit aligned)
 69  * @count: number of 64-bit quantities to copy
 70  *
 71  * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
 72  * time.  Order of access is not guaranteed, nor is a memory barrier
 73  * performed afterwards.
 74  */
 75 void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
 76                                             const void *from,
 77                                             size_t count)
 78 {
 79 #ifdef CONFIG_64BIT
 80         u64 __iomem *dst = to;
 81         const u64 *src = from;
 82         const u64 *end = src + count;
 83 
 84         while (src < end)
 85                 __raw_writeq(*src++, dst++);
 86 #else
 87         __iowrite32_copy(to, from, count * 2);
 88 #endif
 89 }
 90 
 91 EXPORT_SYMBOL_GPL(__iowrite64_copy);
 92 

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