diff options
Diffstat (limited to 'backport/compat/backport-4.5.c')
-rw-r--r-- | backport/compat/backport-4.5.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/backport/compat/backport-4.5.c b/backport/compat/backport-4.5.c index 13764dc7..b4aae624 100644 --- a/backport/compat/backport-4.5.c +++ b/backport/compat/backport-4.5.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <asm/uaccess.h> +#include <linux/io.h> #if LINUX_VERSION_IS_GEQ(3,19,0) int led_set_brightness_sync(struct led_classdev *led_cdev, @@ -150,3 +151,24 @@ int devm_led_trigger_register(struct device *dev, return rc; } EXPORT_SYMBOL_GPL(devm_led_trigger_register); + +/** + * __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); |