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Diffstat (limited to 'arch/unicore32/mm/ioremap.c')
-rw-r--r--arch/unicore32/mm/ioremap.c242
1 files changed, 0 insertions, 242 deletions
diff --git a/arch/unicore32/mm/ioremap.c b/arch/unicore32/mm/ioremap.c
deleted file mode 100644
index 46a64bd6156a..000000000000
--- a/arch/unicore32/mm/ioremap.c
+++ /dev/null
@@ -1,242 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/arch/unicore32/mm/ioremap.c
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Copyright (C) 2001-2010 GUAN Xue-tao
- *
- * Re-map IO memory to kernel address space so that we can access it.
- *
- * This allows a driver to remap an arbitrary region of bus memory into
- * virtual space. One should *only* use readl, writel, memcpy_toio and
- * so on with such remapped areas.
- *
- * Because UniCore only has a 32-bit address space we can't address the
- * whole of the (physical) PCI space at once. PCI huge-mode addressing
- * allows us to circumvent this restriction by splitting PCI space into
- * two 2GB chunks and mapping only one at a time into processor memory.
- * We use MMU protection domains to trap any attempt to access the bank
- * that is not currently mapped. (This isn't fully implemented yet.)
- */
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/mm.h>
-#include <linux/vmalloc.h>
-#include <linux/io.h>
-
-#include <asm/cputype.h>
-#include <asm/cacheflush.h>
-#include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
-#include <asm/tlbflush.h>
-#include <linux/sizes.h>
-
-#include <mach/map.h>
-#include "mm.h"
-
-/*
- * Used by ioremap() and iounmap() code to mark (super)section-mapped
- * I/O regions in vm_struct->flags field.
- */
-#define VM_UNICORE_SECTION_MAPPING 0x80000000
-
-int ioremap_page(unsigned long virt, unsigned long phys,
- const struct mem_type *mtype)
-{
- return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
- __pgprot(mtype->prot_pte));
-}
-EXPORT_SYMBOL(ioremap_page);
-
-/*
- * Section support is unsafe on SMP - If you iounmap and ioremap a region,
- * the other CPUs will not see this change until their next context switch.
- * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
- * which requires the new ioremap'd region to be referenced, the CPU will
- * reference the _old_ region.
- *
- * Note that get_vm_area_caller() allocates a guard 4K page, so we need to
- * mask the size back to 4MB aligned or we will overflow in the loop below.
- */
-static void unmap_area_sections(unsigned long virt, unsigned long size)
-{
- unsigned long addr = virt, end = virt + (size & ~(SZ_4M - 1));
- pgd_t *pgd;
-
- flush_cache_vunmap(addr, end);
- pgd = pgd_offset_k(addr);
- do {
- pmd_t pmd, *pmdp = pmd_offset((pud_t *)pgd, addr);
-
- pmd = *pmdp;
- if (!pmd_none(pmd)) {
- /*
- * Clear the PMD from the page table, and
- * increment the kvm sequence so others
- * notice this change.
- *
- * Note: this is still racy on SMP machines.
- */
- pmd_clear(pmdp);
-
- /*
- * Free the page table, if there was one.
- */
- if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
- pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
- }
-
- addr += PGDIR_SIZE;
- pgd++;
- } while (addr < end);
-
- flush_tlb_kernel_range(virt, end);
-}
-
-static int
-remap_area_sections(unsigned long virt, unsigned long pfn,
- size_t size, const struct mem_type *type)
-{
- unsigned long addr = virt, end = virt + size;
- pgd_t *pgd;
-
- /*
- * Remove and free any PTE-based mapping, and
- * sync the current kernel mapping.
- */
- unmap_area_sections(virt, size);
-
- pgd = pgd_offset_k(addr);
- do {
- pmd_t *pmd = pmd_offset((pud_t *)pgd, addr);
-
- set_pmd(pmd, __pmd(__pfn_to_phys(pfn) | type->prot_sect));
- pfn += SZ_4M >> PAGE_SHIFT;
- flush_pmd_entry(pmd);
-
- addr += PGDIR_SIZE;
- pgd++;
- } while (addr < end);
-
- return 0;
-}
-
-void __iomem *__uc32_ioremap_pfn_caller(unsigned long pfn,
- unsigned long offset, size_t size, unsigned int mtype, void *caller)
-{
- const struct mem_type *type;
- int err;
- unsigned long addr;
- struct vm_struct *area;
-
- /*
- * High mappings must be section aligned
- */
- if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SECTION_MASK))
- return NULL;
-
- /*
- * Don't allow RAM to be mapped
- */
- if (pfn_valid(pfn)) {
- WARN(1, "BUG: Your driver calls ioremap() on\n"
- "system memory. This leads to architecturally\n"
- "unpredictable behaviour, and ioremap() will fail in\n"
- "the next kernel release. Please fix your driver.\n");
- return NULL;
- }
-
- type = get_mem_type(mtype);
- if (!type)
- return NULL;
-
- /*
- * Page align the mapping size, taking account of any offset.
- */
- size = PAGE_ALIGN(offset + size);
-
- area = get_vm_area_caller(size, VM_IOREMAP, caller);
- if (!area)
- return NULL;
- addr = (unsigned long)area->addr;
-
- if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
- area->flags |= VM_UNICORE_SECTION_MAPPING;
- err = remap_area_sections(addr, pfn, size, type);
- } else
- err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
- __pgprot(type->prot_pte));
-
- if (err) {
- vunmap((void *)addr);
- return NULL;
- }
-
- flush_cache_vmap(addr, addr + size);
- return (void __iomem *) (offset + addr);
-}
-
-void __iomem *__uc32_ioremap_caller(unsigned long phys_addr, size_t size,
- unsigned int mtype, void *caller)
-{
- unsigned long last_addr;
- unsigned long offset = phys_addr & ~PAGE_MASK;
- unsigned long pfn = __phys_to_pfn(phys_addr);
-
- /*
- * Don't allow wraparound or zero size
- */
- last_addr = phys_addr + size - 1;
- if (!size || last_addr < phys_addr)
- return NULL;
-
- return __uc32_ioremap_pfn_caller(pfn, offset, size, mtype, caller);
-}
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- */
-void __iomem *
-__uc32_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
- unsigned int mtype)
-{
- return __uc32_ioremap_pfn_caller(pfn, offset, size, mtype,
- __builtin_return_address(0));
-}
-EXPORT_SYMBOL(__uc32_ioremap_pfn);
-
-void __iomem *
-__uc32_ioremap(unsigned long phys_addr, size_t size)
-{
- return __uc32_ioremap_caller(phys_addr, size, MT_DEVICE,
- __builtin_return_address(0));
-}
-EXPORT_SYMBOL(__uc32_ioremap);
-
-void __uc32_iounmap(volatile void __iomem *io_addr)
-{
- void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
- struct vm_struct *vm;
-
- /*
- * If this is a section based mapping we need to handle it
- * specially as the VM subsystem does not know how to handle
- * such a beast. We need the lock here b/c we need to clear
- * all the mappings before the area can be reclaimed
- * by someone else.
- */
- vm = find_vm_area(addr);
- if (vm && (vm->flags & VM_IOREMAP) &&
- (vm->flags & VM_UNICORE_SECTION_MAPPING))
- unmap_area_sections((unsigned long)vm->addr, vm->size);
-
- vunmap(addr);
-}
-EXPORT_SYMBOL(__uc32_iounmap);