![Linus Torvalds](/assets/img/avatar_default.png)
Rob Herring has done a sweeping change cleaning up all of the mach/io.h includes, moving some of the oft-repeated macros to a common location and removing a bunch of boiler plate. This is another step closer to a common zImage for multiple platforms. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJPcpqHAAoJEIwa5zzehBx3xCMP/2evrPQyorzMBztrFB4Ry9Ol qNkSVNsemZjdtkY2dnJv+zJ/Xb0PPDU9EuBHr/SpqmVrRZEZeJND42wZK/OTFCBZ Ufi7KP1qE30daO5H3YmL+58/Ixir5fTHqggqolHhTcEYU2hnHgLBI4rIFu92kSO7 TMyrAUs14jSkTVZc6HSF83w3PfQWhMzWvspJVHQ6RebZRruETAr7v9weVMbgxcDk jQ5XJ9y73rGs2AF8bZTpUdFPzkcac7UiHn3/XyqoZs8RNCL98BGpskzhILyTARf5 X90c9mqQF+AEbb9QSDDd52uYFsJ/5COJvWdlExRI9gZZDI8Pd05ijZBR9IdGJg/B NsVsl98wvZ/zjHJ/Sb2qt5ruet7PiQUGhkshB42jVHsaWfRM030sKGYxQ8pX5Tsa cSagnfBCvAZ9VjDLkXrnEbWRNTz8LSwn9l63z0jmtm5D8+vbpMtgvtWARtuZ4RNn D8wIWoyT0ytVZnosu5441TEgCejtcKOEFzThvKDYMeMJZ/rqVkAbcznapoC2qUd4 fceNlLfQFvW7xpY1MY8mhlwC0ki4hM9MSDieaXUyefvAU/hoSp8MveVUH5UspYfb 0FpkEhzklW/g0/fuq0DJQIrMn7dajjUvVZIUQtiVQuFHOr6RUbFG5vmXuCbAyx10 PE2K4rnKz+PC8bKab7v9 =YIsn -----END PGP SIGNATURE----- Merge tag 'cleanup2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull "ARM: cleanups of io includes" from Olof Johansson: "Rob Herring has done a sweeping change cleaning up all of the mach/io.h includes, moving some of the oft-repeated macros to a common location and removing a bunch of boiler plate. This is another step closer to a common zImage for multiple platforms." Fix up various fairly trivial conflicts (<mach/io.h> removal vs changes around it, tegra localtimer.o is *still* gone, yadda-yadda). * tag 'cleanup2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (29 commits) ARM: tegra: Include assembler.h in sleep.S to fix build break ARM: pxa: use common IOMEM definition ARM: dma-mapping: convert ARCH_HAS_DMA_SET_COHERENT_MASK to kconfig symbol ARM: __io abuse cleanup ARM: create a common IOMEM definition ARM: iop13xx: fix missing declaration of iop13xx_init_early ARM: fix ioremap/iounmap for !CONFIG_MMU ARM: kill off __mem_pci ARM: remove bunch of now unused mach/io.h files ARM: make mach/io.h include optional ARM: clps711x: remove unneeded include of mach/io.h ARM: dove: add explicit include of dove.h to addr-map.c ARM: at91: add explicit include of hardware.h to uncompressor ARM: ep93xx: clean-up mach/io.h ARM: tegra: clean-up mach/io.h ARM: orion5x: clean-up mach/io.h ARM: davinci: remove unneeded mach/io.h include [media] davinci: remove includes of mach/io.h ARM: OMAP: Remove remaining includes for mach/io.h ARM: msm: clean-up mach/io.h ...
386 lines
10 KiB
C
386 lines
10 KiB
C
/*
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* linux/arch/arm/mm/ioremap.c
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*
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* Re-map IO memory to kernel address space so that we can access it.
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*
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* Hacked for ARM by Phil Blundell <philb@gnu.org>
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* Hacked to allow all architectures to build, and various cleanups
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* by Russell King
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*
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* This allows a driver to remap an arbitrary region of bus memory into
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* virtual space. One should *only* use readl, writel, memcpy_toio and
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* so on with such remapped areas.
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*
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* Because the ARM only has a 32-bit address space we can't address the
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* whole of the (physical) PCI space at once. PCI huge-mode addressing
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* allows us to circumvent this restriction by splitting PCI space into
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* two 2GB chunks and mapping only one at a time into processor memory.
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* We use MMU protection domains to trap any attempt to access the bank
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* that is not currently mapped. (This isn't fully implemented yet.)
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/io.h>
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#include <asm/cp15.h>
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#include <asm/cputype.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/sizes.h>
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#include <asm/system_info.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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int ioremap_page(unsigned long virt, unsigned long phys,
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const struct mem_type *mtype)
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{
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return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
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__pgprot(mtype->prot_pte));
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}
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EXPORT_SYMBOL(ioremap_page);
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void __check_kvm_seq(struct mm_struct *mm)
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{
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unsigned int seq;
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do {
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seq = init_mm.context.kvm_seq;
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memcpy(pgd_offset(mm, VMALLOC_START),
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pgd_offset_k(VMALLOC_START),
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sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
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pgd_index(VMALLOC_START)));
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mm->context.kvm_seq = seq;
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} while (seq != init_mm.context.kvm_seq);
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}
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#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
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/*
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* Section support is unsafe on SMP - If you iounmap and ioremap a region,
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* the other CPUs will not see this change until their next context switch.
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* Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
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* which requires the new ioremap'd region to be referenced, the CPU will
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* reference the _old_ region.
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*
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* Note that get_vm_area_caller() allocates a guard 4K page, so we need to
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* mask the size back to 1MB aligned or we will overflow in the loop below.
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*/
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static void unmap_area_sections(unsigned long virt, unsigned long size)
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{
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unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmdp;
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flush_cache_vunmap(addr, end);
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pgd = pgd_offset_k(addr);
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pud = pud_offset(pgd, addr);
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pmdp = pmd_offset(pud, addr);
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do {
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pmd_t pmd = *pmdp;
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if (!pmd_none(pmd)) {
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/*
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* Clear the PMD from the page table, and
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* increment the kvm sequence so others
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* notice this change.
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*
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* Note: this is still racy on SMP machines.
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*/
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pmd_clear(pmdp);
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init_mm.context.kvm_seq++;
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/*
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* Free the page table, if there was one.
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*/
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if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
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pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
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}
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addr += PMD_SIZE;
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pmdp += 2;
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} while (addr < end);
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/*
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* Ensure that the active_mm is up to date - we want to
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* catch any use-after-iounmap cases.
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*/
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if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
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__check_kvm_seq(current->active_mm);
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flush_tlb_kernel_range(virt, end);
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}
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static int
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remap_area_sections(unsigned long virt, unsigned long pfn,
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size_t size, const struct mem_type *type)
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{
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unsigned long addr = virt, end = virt + size;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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/*
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* Remove and free any PTE-based mapping, and
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* sync the current kernel mapping.
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*/
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unmap_area_sections(virt, size);
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pgd = pgd_offset_k(addr);
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pud = pud_offset(pgd, addr);
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pmd = pmd_offset(pud, addr);
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do {
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pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
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pfn += SZ_1M >> PAGE_SHIFT;
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pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
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pfn += SZ_1M >> PAGE_SHIFT;
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flush_pmd_entry(pmd);
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addr += PMD_SIZE;
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pmd += 2;
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} while (addr < end);
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return 0;
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}
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static int
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remap_area_supersections(unsigned long virt, unsigned long pfn,
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size_t size, const struct mem_type *type)
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{
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unsigned long addr = virt, end = virt + size;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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/*
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* Remove and free any PTE-based mapping, and
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* sync the current kernel mapping.
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*/
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unmap_area_sections(virt, size);
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pgd = pgd_offset_k(virt);
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pud = pud_offset(pgd, addr);
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pmd = pmd_offset(pud, addr);
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do {
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unsigned long super_pmd_val, i;
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super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
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PMD_SECT_SUPER;
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super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
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for (i = 0; i < 8; i++) {
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pmd[0] = __pmd(super_pmd_val);
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pmd[1] = __pmd(super_pmd_val);
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flush_pmd_entry(pmd);
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addr += PMD_SIZE;
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pmd += 2;
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}
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pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
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} while (addr < end);
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return 0;
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}
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#endif
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void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
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unsigned long offset, size_t size, unsigned int mtype, void *caller)
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{
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const struct mem_type *type;
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int err;
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unsigned long addr;
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struct vm_struct * area;
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#ifndef CONFIG_ARM_LPAE
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/*
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* High mappings must be supersection aligned
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*/
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if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
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return NULL;
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#endif
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type = get_mem_type(mtype);
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if (!type)
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return NULL;
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/*
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* Page align the mapping size, taking account of any offset.
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*/
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size = PAGE_ALIGN(offset + size);
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/*
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* Try to reuse one of the static mapping whenever possible.
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*/
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read_lock(&vmlist_lock);
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for (area = vmlist; area; area = area->next) {
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if (!size || (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
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break;
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if (!(area->flags & VM_ARM_STATIC_MAPPING))
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continue;
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if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
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continue;
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if (__phys_to_pfn(area->phys_addr) > pfn ||
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__pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
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continue;
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/* we can drop the lock here as we know *area is static */
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read_unlock(&vmlist_lock);
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addr = (unsigned long)area->addr;
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addr += __pfn_to_phys(pfn) - area->phys_addr;
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return (void __iomem *) (offset + addr);
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}
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read_unlock(&vmlist_lock);
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/*
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* Don't allow RAM to be mapped - this causes problems with ARMv6+
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*/
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if (WARN_ON(pfn_valid(pfn)))
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return NULL;
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area = get_vm_area_caller(size, VM_IOREMAP, caller);
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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 !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
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if (DOMAIN_IO == 0 &&
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(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
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cpu_is_xsc3()) && pfn >= 0x100000 &&
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!((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
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area->flags |= VM_ARM_SECTION_MAPPING;
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err = remap_area_supersections(addr, pfn, size, type);
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} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
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area->flags |= VM_ARM_SECTION_MAPPING;
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err = remap_area_sections(addr, pfn, size, type);
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} else
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#endif
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err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
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__pgprot(type->prot_pte));
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if (err) {
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vunmap((void *)addr);
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return NULL;
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}
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flush_cache_vmap(addr, addr + size);
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return (void __iomem *) (offset + addr);
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}
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void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
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unsigned int mtype, void *caller)
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{
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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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/*
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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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return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
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caller);
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}
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space. Needed when the kernel wants to access high addresses
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* directly.
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*
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* NOTE! We need to allow non-page-aligned mappings too: we will obviously
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* have to convert them into an offset in a page-aligned mapping, but the
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* caller shouldn't need to know that small detail.
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*/
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void __iomem *
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__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
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unsigned int mtype)
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{
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return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(__arm_ioremap_pfn);
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void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
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unsigned int, void *) =
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__arm_ioremap_caller;
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void __iomem *
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__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
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{
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return arch_ioremap_caller(phys_addr, size, mtype,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(__arm_ioremap);
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space as memory. Needed when the kernel wants to execute
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* code in external memory. This is needed for reprogramming source
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* clocks that would affect normal memory for example. Please see
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* CONFIG_GENERIC_ALLOCATOR for allocating external memory.
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*/
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void __iomem *
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__arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached)
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{
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unsigned int mtype;
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if (cached)
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mtype = MT_MEMORY;
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else
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mtype = MT_MEMORY_NONCACHED;
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return __arm_ioremap_caller(phys_addr, size, mtype,
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__builtin_return_address(0));
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}
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void __iounmap(volatile void __iomem *io_addr)
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{
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void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
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struct vm_struct *vm;
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read_lock(&vmlist_lock);
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for (vm = vmlist; vm; vm = vm->next) {
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if (vm->addr > addr)
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break;
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if (!(vm->flags & VM_IOREMAP))
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continue;
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/* If this is a static mapping we must leave it alone */
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if ((vm->flags & VM_ARM_STATIC_MAPPING) &&
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(vm->addr <= addr) && (vm->addr + vm->size > addr)) {
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read_unlock(&vmlist_lock);
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return;
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}
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#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
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/*
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* If this is a section based mapping we need to handle it
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* specially as the VM subsystem does not know how to handle
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* such a beast.
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*/
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if ((vm->addr == addr) &&
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(vm->flags & VM_ARM_SECTION_MAPPING)) {
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unmap_area_sections((unsigned long)vm->addr, vm->size);
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break;
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}
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#endif
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}
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read_unlock(&vmlist_lock);
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vunmap(addr);
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}
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void (*arch_iounmap)(volatile void __iomem *) = __iounmap;
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void __arm_iounmap(volatile void __iomem *io_addr)
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{
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arch_iounmap(io_addr);
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}
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EXPORT_SYMBOL(__arm_iounmap);
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