^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) * (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Bjorn Helgaas <bjorn.helgaas@hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/meminit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static inline void __iomem *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) __ioremap_uc(unsigned long phys_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void __iomem *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) early_ioremap (unsigned long phys_addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) u64 attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) attr = kern_mem_attribute(phys_addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) if (attr & EFI_MEMORY_WB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) return (void __iomem *) phys_to_virt(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return __ioremap_uc(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void __iomem *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) ioremap (unsigned long phys_addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void __iomem *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct vm_struct *area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) pgprot_t prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) u64 attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned long gran_base, gran_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long page_base;
^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) * For things in kern_memmap, we must use the same attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * as the rest of the kernel. For more details, see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Documentation/ia64/aliasing.rst.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) attr = kern_mem_attribute(phys_addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (attr & EFI_MEMORY_WB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return (void __iomem *) phys_to_virt(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) else if (attr & EFI_MEMORY_UC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return __ioremap_uc(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Some chipsets don't support UC access to memory. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * WB is supported for the whole granule, we prefer that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) gran_base = GRANULEROUNDDOWN(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return (void __iomem *) phys_to_virt(phys_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) * WB is not supported for the whole granule, so we can't use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * the region 7 identity mapping. If we can safely cover the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * area with kernel page table mappings, we can use those
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) page_base = phys_addr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) size = PAGE_ALIGN(phys_addr + size) - page_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) prot = PAGE_KERNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Mappings have to be page-aligned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) offset = phys_addr & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) phys_addr &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Ok, go for it..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) area = get_vm_area(size, VM_IOREMAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!area)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) area->phys_addr = phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) addr = (void __iomem *) area->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (ioremap_page_range((unsigned long) addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) (unsigned long) addr + size, phys_addr, prot)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) vunmap((void __force *) addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return (void __iomem *) (offset + (char __iomem *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return __ioremap_uc(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) EXPORT_SYMBOL(ioremap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) void __iomem *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ioremap_uc(unsigned long phys_addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return __ioremap_uc(phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) EXPORT_SYMBOL(ioremap_uc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) early_iounmap (volatile void __iomem *addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) iounmap (volatile void __iomem *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (REGION_NUMBER(addr) == RGN_GATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) vunmap((void *) ((unsigned long) addr & PAGE_MASK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) EXPORT_SYMBOL(iounmap);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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