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Date: Fri, 23 Oct 2015 13:01:50 -0700 From: Stephen Boyd <sboyd@...eaurora.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Andy Gross <agross@...eaurora.org>, Bjorn Andersson <bjorn.andersson@...ymobile.com> Subject: [PATCH v3 2/4] lib: iomap_copy: Add __ioread32_copy() Some drivers need to read data out of iomem areas 32-bits at a time. Add an API to do this. Cc: Bjorn Andersson <bjorn.andersson@...ymobile.com> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org> --- include/linux/io.h | 1 + lib/iomap_copy.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/linux/io.h b/include/linux/io.h index de64c1e53612..72c35e0a41d1 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -29,6 +29,7 @@ struct device; struct resource; __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); +void __ioread32_copy(void *to, const void __iomem *from, size_t count); void __iowrite64_copy(void __iomem *to, const void *from, size_t count); #ifdef CONFIG_MMU diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c index 4527e751b5e0..b8f1d6cbb200 100644 --- a/lib/iomap_copy.c +++ b/lib/iomap_copy.c @@ -42,6 +42,27 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, EXPORT_SYMBOL_GPL(__iowrite32_copy); /** + * __ioread32_copy - copy data from MMIO space, in 32-bit units + * @to: destination (must be 32-bit aligned) + * @from: source, in MMIO space (must be 32-bit aligned) + * @count: number of 32-bit quantities to copy + * + * Copy data from MMIO space to kernel space, in units of 32 bits at a + * time. Order of access is not guaranteed, nor is a memory barrier + * performed afterwards. + */ +void __ioread32_copy(void *to, const void __iomem *from, size_t count) +{ + u32 *dst = to; + const u32 __iomem *src = from; + const u32 __iomem *end = src + count; + + while (src < end) + *dst++ = __raw_readl(src++); +} +EXPORT_SYMBOL_GPL(__ioread32_copy); + +/** * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units * @to: destination, in MMIO space (must be 64-bit aligned) * @from: source (must be 64-bit aligned) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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