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Linux/arch/xtensa/mm/ioremap.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * ioremap implementation.
  4  *
  5  * Copyright (C) 2015 Cadence Design Systems Inc.
  6  */
  7 
  8 #include <linux/io.h>
  9 #include <linux/vmalloc.h>
 10 #include <linux/pgtable.h>
 11 #include <asm/cacheflush.h>
 12 #include <asm/io.h>
 13 
 14 static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
 15                                     pgprot_t prot)
 16 {
 17         unsigned long offset = paddr & ~PAGE_MASK;
 18         unsigned long pfn = __phys_to_pfn(paddr);
 19         struct vm_struct *area;
 20         unsigned long vaddr;
 21         int err;
 22 
 23         paddr &= PAGE_MASK;
 24 
 25         WARN_ON(pfn_valid(pfn));
 26 
 27         size = PAGE_ALIGN(offset + size);
 28 
 29         area = get_vm_area(size, VM_IOREMAP);
 30         if (!area)
 31                 return NULL;
 32 
 33         vaddr = (unsigned long)area->addr;
 34         area->phys_addr = paddr;
 35 
 36         err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
 37 
 38         if (err) {
 39                 vunmap((void *)vaddr);
 40                 return NULL;
 41         }
 42 
 43         flush_cache_vmap(vaddr, vaddr + size);
 44         return (void __iomem *)(offset + vaddr);
 45 }
 46 
 47 void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
 48 {
 49         return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
 50 }
 51 EXPORT_SYMBOL(xtensa_ioremap_nocache);
 52 
 53 void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
 54 {
 55         return xtensa_ioremap(addr, size, PAGE_KERNEL);
 56 }
 57 EXPORT_SYMBOL(xtensa_ioremap_cache);
 58 
 59 void xtensa_iounmap(volatile void __iomem *io_addr)
 60 {
 61         void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
 62 
 63         vunmap(addr);
 64 }
 65 EXPORT_SYMBOL(xtensa_iounmap);
 66 

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