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[ARM] 3070/2: Add __ioremap_pfn() API
Patch from Deepak Saxena In working on adding 36-bit addressed supersection support to ioremap(), I came to the conclusion that it would be far simpler to do so by just splitting __ioremap() into a main external interface and adding an __ioremap_pfn() function that takes a pfn + offset into the page that __ioremap() can call. This way existing callers of __ioremap() won't have to change their code and 36-bit systems will just call __ioremap_pfn() and we will not have to deal with unsigned long long variables. Note that __ioremap_pfn() should _NOT_ be called directly by drivers but is reserved for use by arch_ioremap() implementations that map 32-bit resource regions into the real 36-bit address and then call this new function. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -86,11 +86,12 @@ remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
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}
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static int
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remap_area_pages(unsigned long start, unsigned long phys_addr,
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remap_area_pages(unsigned long start, unsigned long pfn,
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unsigned long size, unsigned long flags)
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{
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unsigned long address = start;
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unsigned long end = start + size;
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unsigned long phys_addr = __pfn_to_phys(pfn);
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int err = 0;
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pgd_t * dir;
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@ -129,37 +130,45 @@ remap_area_pages(unsigned long start, unsigned long phys_addr,
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* 'flags' are the extra L_PTE_ flags that you want to specify for this
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* mapping. See include/asm-arm/proc-armv/pgtable.h for more information.
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*/
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void __iomem *
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__ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
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unsigned long flags)
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{
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unsigned long addr;
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struct vm_struct * area;
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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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addr = (unsigned long)area->addr;
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if (remap_area_pages(addr, pfn, size, flags)) {
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vfree(addr);
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return NULL;
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}
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return (void __iomem *) (offset + (char *)addr);
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}
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EXPORT_SYMBOL(__ioremap_pfn);
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void __iomem *
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__ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
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{
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void * addr;
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struct vm_struct * area;
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unsigned long offset, last_addr;
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unsigned long last_addr;
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unsigned long offset = phys_addr & ~PAGE_MASK;
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unsigned long pfn = __phys_to_pfn(phys_addr);
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/* Don't allow wraparound or zero size */
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/*
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* Don't allow wraparound or zero size
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*/
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last_addr = phys_addr + size - 1;
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if (!size || last_addr < phys_addr)
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return NULL;
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/*
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* Mappings have to be page-aligned
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* Page align the mapping size
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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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size = PAGE_ALIGN(last_addr + 1) - phys_addr;
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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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addr = area->addr;
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if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
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vfree(addr);
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return NULL;
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}
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return (void __iomem *) (offset + (char *)addr);
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return __ioremap_pfn(pfn, offset, size, flags);
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}
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EXPORT_SYMBOL(__ioremap);
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@ -56,7 +56,12 @@ extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
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/*
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* Architecture ioremap implementation.
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*
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* __ioremap takes CPU physical address.
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*
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* __ioremap_pfn takes a Page Frame Number and an offset into that page
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*/
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extern void __iomem * __ioremap_pfn(unsigned long, unsigned long, size_t, unsigned long);
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extern void __iomem * __ioremap(unsigned long, size_t, unsigned long);
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extern void __iounmap(void __iomem *addr);
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@ -261,6 +266,7 @@ out:
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*
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* ioremap takes a PCI memory address, as specified in
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* Documentation/IO-mapping.txt.
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*
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*/
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#ifndef __arch_ioremap
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#define ioremap(cookie,size) __ioremap(cookie,size,0)
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@ -27,9 +27,6 @@ struct meminfo;
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#define MT_ROM 6
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#define MT_IXP2000_DEVICE 7
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#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
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#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
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extern void create_memmap_holes(struct meminfo *);
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extern void memtable_init(struct meminfo *);
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extern void iotable_init(struct map_desc *, int);
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@ -57,6 +57,12 @@
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#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
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#endif
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/*
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* Convert a physical address to a Page Frame Number and back
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*/
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#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
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#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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