The patch titled
Subject: lib: iomap_copy: Add __ioread32_copy()
has been added to the -mm tree. Its filename is
lib-iomap_copy-add-__ioread32_copy.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-iomap_copy-add-__ioread32_copy.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-iomap_copy-add-__ioread32_copy.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Subject: 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.
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
Cc: Andy Gross <agross@xxxxxxxxxxxxxx>
Cc: David Brown <davidb@xxxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/io.h | 1 +
lib/iomap_copy.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+)
diff -puN include/linux/io.h~lib-iomap_copy-add-__ioread32_copy include/linux/io.h
--- a/include/linux/io.h~lib-iomap_copy-add-__ioread32_copy
+++ a/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 -puN lib/iomap_copy.c~lib-iomap_copy-add-__ioread32_copy lib/iomap_copy.c
--- a/lib/iomap_copy.c~lib-iomap_copy-add-__ioread32_copy
+++ a/lib/iomap_copy.c
@@ -42,6 +42,27 @@ void __attribute__((weak)) __iowrite32_c
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)
_
Patches currently in -mm which might be from sboyd@xxxxxxxxxxxxxx are
lib-iomap_copy-add-__ioread32_copy.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
