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Linux/arch/arc/mm/ioremap.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  4  */
  5 
  6 #include <linux/vmalloc.h>
  7 #include <linux/init.h>
  8 #include <linux/module.h>
  9 #include <linux/io.h>
 10 #include <linux/mm.h>
 11 #include <linux/slab.h>
 12 #include <linux/cache.h>
 13 
 14 static inline bool arc_uncached_addr_space(phys_addr_t paddr)
 15 {
 16         if (is_isa_arcompact()) {
 17                 if (paddr >= ARC_UNCACHED_ADDR_SPACE)
 18                         return true;
 19         } else if (paddr >= perip_base && paddr <= perip_end) {
 20                 return true;
 21         }
 22 
 23         return false;
 24 }
 25 
 26 void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
 27 {
 28         phys_addr_t end;
 29 
 30         /* Don't allow wraparound or zero size */
 31         end = paddr + size - 1;
 32         if (!size || (end < paddr))
 33                 return NULL;
 34 
 35         /*
 36          * If the region is h/w uncached, MMU mapping can be elided as optim
 37          * The cast to u32 is fine as this region can only be inside 4GB
 38          */
 39         if (arc_uncached_addr_space(paddr))
 40                 return (void __iomem *)(u32)paddr;
 41 
 42         return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
 43 }
 44 EXPORT_SYMBOL(ioremap);
 45 
 46 /*
 47  * ioremap with access flags
 48  * Cache semantics wise it is same as ioremap - "forced" uncached.
 49  * However unlike vanilla ioremap which bypasses ARC MMU for addresses in
 50  * ARC hardware uncached region, this one still goes thru the MMU as caller
 51  * might need finer access control (R/W/X)
 52  */
 53 void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
 54                            unsigned long flags)
 55 {
 56         unsigned int off;
 57         unsigned long vaddr;
 58         struct vm_struct *area;
 59         phys_addr_t end;
 60         pgprot_t prot = __pgprot(flags);
 61 
 62         /* Don't allow wraparound, zero size */
 63         end = paddr + size - 1;
 64         if ((!size) || (end < paddr))
 65                 return NULL;
 66 
 67         /* An early platform driver might end up here */
 68         if (!slab_is_available())
 69                 return NULL;
 70 
 71         /* force uncached */
 72         prot = pgprot_noncached(prot);
 73 
 74         /* Mappings have to be page-aligned */
 75         off = paddr & ~PAGE_MASK;
 76         paddr &= PAGE_MASK_PHYS;
 77         size = PAGE_ALIGN(end + 1) - paddr;
 78 
 79         /*
 80          * Ok, go for it..
 81          */
 82         area = get_vm_area(size, VM_IOREMAP);
 83         if (!area)
 84                 return NULL;
 85         area->phys_addr = paddr;
 86         vaddr = (unsigned long)area->addr;
 87         if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
 88                 vunmap((void __force *)vaddr);
 89                 return NULL;
 90         }
 91         return (void __iomem *)(off + (char __iomem *)vaddr);
 92 }
 93 EXPORT_SYMBOL(ioremap_prot);
 94 
 95 
 96 void iounmap(const void __iomem *addr)
 97 {
 98         /* weird double cast to handle phys_addr_t > 32 bits */
 99         if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
100                 return;
101 
102         vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
103 }
104 EXPORT_SYMBOL(iounmap);
105 

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