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fbdev: Move framebuffer I/O helpers into <asm/fb.h>

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Implement framebuffer I/O helpers, such as fb_read*() and fb_write*(),
in the architecture's <asm/fb.h> header file or the generic one.

The common case has been the use of regular I/O functions, such as
__raw_readb() or memset_io(). A few architectures used plain system-
memory reads and writes. Sparc used helpers for its SBus.

The architectures that used special cases provide the same code in
their __raw_*() I/O helpers. So the patch replaces this code with the
__raw_*() functions and moves it to <asm-generic/fb.h> for all
architectures.

v8:
	* remove garbage after commit-message tags
v6:
	* fix fb_readq()/fb_writeq() on 64-bit mips (kernel test robot)
v5:
	* include <linux/io.h> in <asm-generic/fb>; fix s390 build
v4:
	* ia64, loongarch, sparc64: add fb_mem*() to arch headers
	  to keep current semantics (Arnd)
v3:
	* implement all architectures with generic helpers
	* support reordering and native byte order (Geert, Arnd)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512102444.5438-7-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2023-05-12 12:24:43 +02:00
parent 8ff1541da3
commit 8f8eaa1b02
6 changed files with 185 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
arch/sparc/include/asm/fb.h
View File

@@ -2,6 +2,8 @@
#ifndef _SPARC_FB_H_
#define _SPARC_FB_H_
#include <linux/io.h>
struct fb_info;
struct file;
struct vm_area_struct;
@@ -16,6 +18,24 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
int fb_is_primary_device(struct fb_info *info);
#define fb_is_primary_device fb_is_primary_device
static inline void fb_memcpy_fromfb(void *to, const volatile void __iomem *from, size_t n)
{
sbus_memcpy_fromio(to, from, n);
}
#define fb_memcpy_fromfb fb_memcpy_fromfb
static inline void fb_memcpy_tofb(volatile void __iomem *to, const void *from, size_t n)
{
sbus_memcpy_toio(to, from, n);
}
#define fb_memcpy_tofb fb_memcpy_tofb
static inline void fb_memset(volatile void __iomem *addr, int c, size_t n)
{
sbus_memset_io(addr, c, n);
}
#define fb_memset fb_memset
#include <asm-generic/fb.h>
#endif /* _SPARC_FB_H_ */