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| author | Christoph Hellwig <hch@lst.de> | 2019-08-13 12:24:04 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-11-11 23:18:20 +0300 |
| commit | 80b0ca98f91ddbc09828aff5a00af1c73837713e (patch) | |
| tree | 9d88b3bd5945b7408861a6297b23164323bac713 /lib | |
| parent | 98c90e5ea34e98bdd4bcb67c48a0bdfd59bcd6cd (diff) | |
| download | linux-80b0ca98f91ddbc09828aff5a00af1c73837713e.tar.xz | |
lib: provide a simple generic ioremap implementation
A lot of architectures reuse the same simple ioremap implementation, so
start lifting the most simple variant to lib/ioremap.c. It provides
ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached,
although that can be overridden by asm/io.h.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Palmer Dabbelt <palmer@dabbelt.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 3 | ||||
| -rw-r--r-- | lib/ioremap.c | 39 |
2 files changed, 42 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 3321d04dfa5a..cb571767d080 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -637,6 +637,9 @@ config STRING_SELFTEST endmenu +config GENERIC_IOREMAP + bool + config GENERIC_LIB_ASHLDI3 bool diff --git a/lib/ioremap.c b/lib/ioremap.c index 0a2ffadc6d71..3f0e18543de8 100644 --- a/lib/ioremap.c +++ b/lib/ioremap.c @@ -231,3 +231,42 @@ int ioremap_page_range(unsigned long addr, return err; } + +#ifdef CONFIG_GENERIC_IOREMAP +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot) +{ + unsigned long offset, vaddr; + phys_addr_t last_addr; + struct vm_struct *area; + + /* Disallow wrap-around or zero size */ + last_addr = addr + size - 1; + if (!size || last_addr < addr) + return NULL; + + /* Page-align mappings */ + offset = addr & (~PAGE_MASK); + addr -= offset; + size = PAGE_ALIGN(size + offset); + + area = get_vm_area_caller(size, VM_IOREMAP, + __builtin_return_address(0)); + if (!area) + return NULL; + vaddr = (unsigned long)area->addr; + + if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) { + free_vm_area(area); + return NULL; + } + + return (void __iomem *)(vaddr + offset); +} +EXPORT_SYMBOL(ioremap_prot); + +void iounmap(volatile void __iomem *addr) +{ + vunmap((void *)((unsigned long)addr & PAGE_MASK)); +} +EXPORT_SYMBOL(iounmap); +#endif /* CONFIG_GENERIC_IOREMAP */ |