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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/parisc/mm/ioremap.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/mm/ioremap.c')
-rw-r--r-- | arch/parisc/mm/ioremap.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c new file mode 100644 index 000000000..345ff0b66 --- /dev/null +++ b/arch/parisc/mm/ioremap.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * arch/parisc/mm/ioremap.c + * + * (C) Copyright 1995 1996 Linus Torvalds + * (C) Copyright 2001-2019 Helge Deller <deller@gmx.de> + * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org> + */ + +#include <linux/vmalloc.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/mm.h> + +/* + * Generic mapping function (not visible outside): + */ + +/* + * Remap an arbitrary physical address space into the kernel virtual + * address space. + * + * NOTE! We need to allow non-page-aligned mappings too: we will obviously + * have to convert them into an offset in a page-aligned mapping, but the + * caller shouldn't need to know that small detail. + */ +void __iomem *ioremap(unsigned long phys_addr, unsigned long size) +{ + void __iomem *addr; + struct vm_struct *area; + unsigned long offset, last_addr; + pgprot_t pgprot; + +#ifdef CONFIG_EISA + unsigned long end = phys_addr + size - 1; + /* Support EISA addresses */ + if ((phys_addr >= 0x00080000 && end < 0x000fffff) || + (phys_addr >= 0x00500000 && end < 0x03bfffff)) + phys_addr |= F_EXTEND(0xfc000000); +#endif + + /* Don't allow wraparound or zero size */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) + return NULL; + + /* + * Don't allow anybody to remap normal RAM that we're using.. + */ + if (phys_addr < virt_to_phys(high_memory)) { + char *t_addr, *t_end; + struct page *page; + + t_addr = __va(phys_addr); + t_end = t_addr + (size - 1); + + for (page = virt_to_page(t_addr); + page <= virt_to_page(t_end); page++) { + if(!PageReserved(page)) + return NULL; + } + } + + pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | + _PAGE_ACCESSED | _PAGE_NO_CACHE); + + /* + * Mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr + 1) - phys_addr; + + /* + * Ok, go for it.. + */ + area = get_vm_area(size, VM_IOREMAP); + if (!area) + return NULL; + + addr = (void __iomem *) area->addr; + if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, + phys_addr, pgprot)) { + vunmap(addr); + return NULL; + } + + return (void __iomem *) (offset + (char __iomem *)addr); +} +EXPORT_SYMBOL(ioremap); + +void iounmap(const volatile void __iomem *io_addr) +{ + unsigned long addr = (unsigned long)io_addr & PAGE_MASK; + + if (is_vmalloc_addr((void *)addr)) + vunmap((void *)addr); +} +EXPORT_SYMBOL(iounmap); |