diff options
| -rw-r--r-- | include/linux/io.h | 1 | ||||
| -rw-r--r-- | lib/iomap_copy.c | 28 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h index 85533ec5aaa..420e2fdf26f 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -21,5 +21,6 @@ #include <asm/io.h> void __iowrite32_copy(void __iomem *to, const void *from, size_t count); +void __iowrite64_copy(void __iomem *to, const void *from, size_t count); #endif /* _LINUX_IO_H */ diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c index 351045f4f63..864fc5ea398 100644 --- a/lib/iomap_copy.c +++ b/lib/iomap_copy.c @@ -40,3 +40,31 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, __raw_writel(*src++, dst++); } EXPORT_SYMBOL_GPL(__iowrite32_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) + * @count: number of 64-bit quantities to copy + * + * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a + * time. Order of access is not guaranteed, nor is a memory barrier + * performed afterwards. + */ +void __attribute__((weak)) __iowrite64_copy(void __iomem *to, + const void *from, + size_t count) +{ +#ifdef CONFIG_64BIT + u64 __iomem *dst = to; + const u64 *src = from; + const u64 *end = src + count; + + while (src < end) + __raw_writeq(*src++, dst++); +#else + __iowrite32_copy(to, from, count * 2); +#endif +} + +EXPORT_SYMBOL_GPL(__iowrite64_copy); |