8f8eaa1b02
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
39 lines
850 B
C
39 lines
850 B
C
#ifndef _ASM_FB_H_
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#define _ASM_FB_H_
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#include <asm/page.h>
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struct file;
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static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
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unsigned long off)
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{
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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}
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#define fb_pgprotect fb_pgprotect
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/*
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* MIPS doesn't define __raw_ I/O macros, so the helpers
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* in <asm-generic/fb.h> don't generate fb_readq() and
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* fb_write(). We have to provide them here.
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*
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* TODO: Convert MIPS to generic I/O. The helpers below can
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* then be removed.
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*/
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#ifdef CONFIG_64BIT
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static inline u64 fb_readq(const volatile void __iomem *addr)
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{
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return __raw_readq(addr);
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}
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#define fb_readq fb_readq
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static inline void fb_writeq(u64 b, volatile void __iomem *addr)
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{
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__raw_writeq(b, addr);
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}
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#define fb_writeq fb_writeq
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#endif
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#include <asm-generic/fb.h>
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#endif /* _ASM_FB_H_ */
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