^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Based on arch/arm/mm/ioremap.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (C) Copyright 1995 1996 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Hacked for ARM by Phil Blundell <philb@gnu.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Hacked to allow all architectures to build, and various cleanups
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * by Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2012 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) pgprot_t prot, void *caller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) unsigned long last_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned long offset = phys_addr & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct vm_struct *area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Page align the mapping address and size, taking account of any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) phys_addr &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) size = PAGE_ALIGN(size + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Don't allow wraparound, zero size or outside PHYS_MASK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) last_addr = phys_addr + size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Don't allow RAM to be mapped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) area = get_vm_area_caller(size, VM_IOREMAP, caller);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (!area)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) addr = (unsigned long)area->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) area->phys_addr = phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) err = ioremap_page_range(addr, addr + size, phys_addr, prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) vunmap((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return (void __iomem *)(offset + addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return __ioremap_caller(phys_addr, size, prot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) __builtin_return_address(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) EXPORT_SYMBOL(__ioremap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) void iounmap(volatile void __iomem *io_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * We could get an address outside vmalloc range in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * of ioremap_cache() reusing a RAM mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (is_vmalloc_addr((void *)addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) vunmap((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) EXPORT_SYMBOL(iounmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* For normal memory we already have a cacheable mapping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (pfn_valid(__phys_to_pfn(phys_addr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return (void __iomem *)__phys_to_virt(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) __builtin_return_address(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) EXPORT_SYMBOL(ioremap_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * Must be called after early_fixmap_init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) void __init early_ioremap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) early_ioremap_setup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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