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123 lines
3.0 KiB
123 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P. |
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* Bjorn Helgaas <[email protected]> |
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*/ |
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#include <linux/compiler.h> |
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#include <linux/module.h> |
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#include <linux/efi.h> |
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#include <linux/io.h> |
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#include <linux/mm.h> |
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#include <linux/vmalloc.h> |
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#include <asm/io.h> |
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#include <asm/meminit.h> |
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static inline void __iomem * |
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__ioremap_uc(unsigned long phys_addr) |
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{ |
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return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr); |
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} |
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void __iomem * |
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early_ioremap (unsigned long phys_addr, unsigned long size) |
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{ |
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u64 attr; |
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attr = kern_mem_attribute(phys_addr, size); |
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if (attr & EFI_MEMORY_WB) |
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return (void __iomem *) phys_to_virt(phys_addr); |
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return __ioremap_uc(phys_addr); |
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} |
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void __iomem * |
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ioremap (unsigned long phys_addr, unsigned long size) |
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{ |
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void __iomem *addr; |
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struct vm_struct *area; |
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unsigned long offset; |
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pgprot_t prot; |
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u64 attr; |
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unsigned long gran_base, gran_size; |
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unsigned long page_base; |
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/* |
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* For things in kern_memmap, we must use the same attribute |
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* as the rest of the kernel. For more details, see |
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* Documentation/ia64/aliasing.rst. |
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*/ |
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attr = kern_mem_attribute(phys_addr, size); |
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if (attr & EFI_MEMORY_WB) |
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return (void __iomem *) phys_to_virt(phys_addr); |
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else if (attr & EFI_MEMORY_UC) |
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return __ioremap_uc(phys_addr); |
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/* |
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* Some chipsets don't support UC access to memory. If |
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* WB is supported for the whole granule, we prefer that. |
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*/ |
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gran_base = GRANULEROUNDDOWN(phys_addr); |
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gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base; |
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if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB) |
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return (void __iomem *) phys_to_virt(phys_addr); |
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/* |
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* WB is not supported for the whole granule, so we can't use |
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* the region 7 identity mapping. If we can safely cover the |
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* area with kernel page table mappings, we can use those |
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* instead. |
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*/ |
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page_base = phys_addr & PAGE_MASK; |
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size = PAGE_ALIGN(phys_addr + size) - page_base; |
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if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) { |
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prot = PAGE_KERNEL; |
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/* |
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* Mappings have to be page-aligned |
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*/ |
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offset = phys_addr & ~PAGE_MASK; |
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phys_addr &= PAGE_MASK; |
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/* |
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* Ok, go for it.. |
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*/ |
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area = get_vm_area(size, VM_IOREMAP); |
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if (!area) |
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return NULL; |
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area->phys_addr = phys_addr; |
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addr = (void __iomem *) area->addr; |
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if (ioremap_page_range((unsigned long) addr, |
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(unsigned long) addr + size, phys_addr, prot)) { |
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vunmap((void __force *) addr); |
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return NULL; |
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} |
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return (void __iomem *) (offset + (char __iomem *)addr); |
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} |
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return __ioremap_uc(phys_addr); |
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} |
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EXPORT_SYMBOL(ioremap); |
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void __iomem * |
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ioremap_uc(unsigned long phys_addr, unsigned long size) |
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{ |
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if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) |
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return NULL; |
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return __ioremap_uc(phys_addr); |
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} |
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EXPORT_SYMBOL(ioremap_uc); |
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void |
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early_iounmap (volatile void __iomem *addr, unsigned long size) |
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{ |
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} |
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void |
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iounmap (volatile void __iomem *addr) |
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{ |
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if (REGION_NUMBER(addr) == RGN_GATE) |
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vunmap((void *) ((unsigned long) addr & PAGE_MASK)); |
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} |
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EXPORT_SYMBOL(iounmap);
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