80 строки
2.2 KiB
C
80 строки
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2006 PathScale, Inc. All Rights Reserved.
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*/
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#include <linux/export.h>
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#include <linux/io.h>
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/**
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* __iowrite32_copy - copy data to MMIO space, in 32-bit units
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* @to: destination, in MMIO space (must be 32-bit aligned)
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* @from: source (must be 32-bit aligned)
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* @count: number of 32-bit quantities to copy
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*
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* Copy data from kernel space to MMIO space, in units of 32 bits at a
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* time. Order of access is not guaranteed, nor is a memory barrier
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* performed afterwards.
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*/
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void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
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const void *from,
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size_t count)
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{
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u32 __iomem *dst = to;
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const u32 *src = from;
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const u32 *end = src + count;
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while (src < end)
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__raw_writel(*src++, dst++);
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}
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EXPORT_SYMBOL_GPL(__iowrite32_copy);
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/**
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* __ioread32_copy - copy data from MMIO space, in 32-bit units
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* @to: destination (must be 32-bit aligned)
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* @from: source, in MMIO space (must be 32-bit aligned)
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* @count: number of 32-bit quantities to copy
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*
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* Copy data from MMIO space to kernel space, in units of 32 bits at a
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* time. Order of access is not guaranteed, nor is a memory barrier
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* performed afterwards.
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*/
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void __ioread32_copy(void *to, const void __iomem *from, size_t count)
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{
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u32 *dst = to;
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const u32 __iomem *src = from;
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const u32 __iomem *end = src + count;
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while (src < end)
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*dst++ = __raw_readl(src++);
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}
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EXPORT_SYMBOL_GPL(__ioread32_copy);
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/**
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* __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
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* @to: destination, in MMIO space (must be 64-bit aligned)
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* @from: source (must be 64-bit aligned)
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* @count: number of 64-bit quantities to copy
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*
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* Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
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* time. Order of access is not guaranteed, nor is a memory barrier
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* performed afterwards.
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*/
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void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
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const void *from,
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size_t count)
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{
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#ifdef CONFIG_64BIT
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u64 __iomem *dst = to;
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const u64 *src = from;
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const u64 *end = src + count;
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while (src < end)
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__raw_writeq(*src++, dst++);
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#else
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__iowrite32_copy(to, from, count * 2);
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#endif
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}
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EXPORT_SYMBOL_GPL(__iowrite64_copy);
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