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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2021-02-02 20:40:55 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-02-04 11:11:35 +0100 |
commit | 107d1c2d528c416363a332c4f0e1515005b9ace4 (patch) | |
tree | af1c6ed74b19127a13e451ac974a1e83d06a750a /include/asm-generic | |
parent | be8c60600f68011264bc6a7321d657b5ecd86e78 (diff) | |
download | barebox-107d1c2d528c416363a332c4f0e1515005b9ace4.tar.gz barebox-107d1c2d528c416363a332c4f0e1515005b9ace4.tar.xz |
asm-generic: define fallback memcpy and memset for device I/O
The Atmel quadspi driver makes use of the memcpy_(to|from)io,
but we don't define them on all platforms. Fix this to allow
for easier porting of kernel code.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/asm-generic')
-rw-r--r-- | include/asm-generic/io.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 76e6d0dc11..a4b0dc4b43 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -11,6 +11,7 @@ #ifndef __ASM_GENERIC_IO_H #define __ASM_GENERIC_IO_H +#include <linux/string.h> /* for memset() and memcpy() */ #include <linux/types.h> #include <asm/byteorder.h> @@ -424,4 +425,58 @@ static inline void iowrite64be(u64 value, volatile void __iomem *addr) #define IOMEM(addr) ((void __force __iomem *)(addr)) #endif +#define __io_virt(x) ((void __force *)(x)) + +#ifndef memset_io +#define memset_io memset_io +/** + * memset_io Set a range of I/O memory to a constant value + * @addr: The beginning of the I/O-memory range to set + * @val: The value to set the memory to + * @count: The number of bytes to set + * + * Set a range of I/O memory to a given value. + */ +static inline void memset_io(volatile void __iomem *addr, int value, + size_t size) +{ + memset(__io_virt(addr), value, size); +} +#endif + +#ifndef memcpy_fromio +#define memcpy_fromio memcpy_fromio +/** + * memcpy_fromio Copy a block of data from I/O memory + * @dst: The (RAM) destination for the copy + * @src: The (I/O memory) source for the data + * @count: The number of bytes to copy + * + * Copy a block of data from I/O memory. + */ +static inline void memcpy_fromio(void *buffer, + const volatile void __iomem *addr, + size_t size) +{ + memcpy(buffer, __io_virt(addr), size); +} +#endif + +#ifndef memcpy_toio +#define memcpy_toio memcpy_toio +/** + * memcpy_toio Copy a block of data into I/O memory + * @dst: The (I/O memory) destination for the copy + * @src: The (RAM) source for the data + * @count: The number of bytes to copy + * + * Copy a block of data to I/O memory. + */ +static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer, + size_t size) +{ + memcpy(__io_virt(addr), buffer, size); +} +#endif + #endif /* __ASM_GENERIC_IO_H */ |