diff options
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/mm/ioremap.c | 100 |
1 files changed, 63 insertions, 37 deletions
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c index 5c7a1b3b932..edd9a9559cb 100644 --- a/arch/parisc/mm/ioremap.c +++ b/arch/parisc/mm/ioremap.c @@ -1,12 +1,9 @@ /* * arch/parisc/mm/ioremap.c * - * Re-map IO memory to kernel address space so that we can access it. - * This is needed for high PCI addresses that aren't mapped in the - * 640k-1MB IO memory area on PC's - * * (C) Copyright 1995 1996 Linus Torvalds * (C) Copyright 2001 Helge Deller <deller@gmx.de> + * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org> */ #include <linux/vmalloc.h> @@ -14,81 +11,107 @@ #include <linux/module.h> #include <asm/io.h> #include <asm/pgalloc.h> +#include <asm/tlbflush.h> +#include <asm/cacheflush.h> -static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size, - unsigned long phys_addr, unsigned long flags) +static inline void +remap_area_pte(pte_t *pte, unsigned long address, unsigned long size, + unsigned long phys_addr, unsigned long flags) { - unsigned long end; + unsigned long end, pfn; + pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | + _PAGE_ACCESSED | flags); address &= ~PMD_MASK; + end = address + size; if (end > PMD_SIZE) end = PMD_SIZE; - if (address >= end) - BUG(); + + BUG_ON(address >= end); + + pfn = phys_addr >> PAGE_SHIFT; do { - if (!pte_none(*pte)) { - printk(KERN_ERR "remap_area_pte: page already exists\n"); - BUG(); - } - set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | _PAGE_RW | - _PAGE_DIRTY | _PAGE_ACCESSED | flags))); + BUG_ON(!pte_none(*pte)); + + set_pte(pte, pfn_pte(pfn, pgprot)); + address += PAGE_SIZE; - phys_addr += PAGE_SIZE; + pfn++; pte++; } while (address && (address < end)); } -static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size, - unsigned long phys_addr, unsigned long flags) +static inline int +remap_area_pmd(pmd_t *pmd, unsigned long address, unsigned long size, + unsigned long phys_addr, unsigned long flags) { unsigned long end; address &= ~PGDIR_MASK; + end = address + size; if (end > PGDIR_SIZE) end = PGDIR_SIZE; + + BUG_ON(address >= end); + phys_addr -= address; - if (address >= end) - BUG(); do { - pte_t * pte = pte_alloc_kernel(pmd, address); + pte_t *pte = pte_alloc_kernel(pmd, address); if (!pte) return -ENOMEM; - remap_area_pte(pte, address, end - address, address + phys_addr, flags); + + remap_area_pte(pte, address, end - address, + address + phys_addr, flags); + address = (address + PMD_SIZE) & PMD_MASK; pmd++; } while (address && (address < end)); + return 0; } -#if (USE_HPPA_IOREMAP) -static int remap_area_pages(unsigned long address, unsigned long phys_addr, - unsigned long size, unsigned long flags) +#if USE_HPPA_IOREMAP +static int +remap_area_pages(unsigned long address, unsigned long phys_addr, + unsigned long size, unsigned long flags) { - int error; - pgd_t * dir; + pgd_t *dir; + int error = 0; unsigned long end = address + size; + BUG_ON(address >= end); + phys_addr -= address; - dir = pgd_offset(&init_mm, address); + dir = pgd_offset_k(address); + flush_cache_all(); - if (address >= end) - BUG(); + do { + pud_t *pud; pmd_t *pmd; - pmd = pmd_alloc(&init_mm, dir, address); + error = -ENOMEM; + pud = pud_alloc(&init_mm, dir, address); + if (!pud) + break; + + pmd = pmd_alloc(&init_mm, pud, address); if (!pmd) break; + if (remap_area_pmd(pmd, address, end - address, - phys_addr + address, flags)) + phys_addr + address, flags)) break; + error = 0; address = (address + PGDIR_SIZE) & PGDIR_MASK; dir++; } while (address && (address < end)); + flush_tlb_all(); + return error; } #endif /* USE_HPPA_IOREMAP */ @@ -123,8 +146,7 @@ EXPORT_SYMBOL(__raw_bad_addr); /* * Remap an arbitrary physical address space into the kernel virtual - * address space. Needed when the kernel wants to access high addresses - * directly. + * address space. * * 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 @@ -148,8 +170,8 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l #endif #else - void * addr; - struct vm_struct * area; + void *addr; + struct vm_struct *area; unsigned long offset, last_addr; /* Don't allow wraparound or zero size */ @@ -167,9 +189,11 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l t_addr = __va(phys_addr); t_end = t_addr + (size - 1); - for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++) + for (page = virt_to_page(t_addr); + page <= virt_to_page(t_end); page++) { if(!PageReserved(page)) return NULL; + } } /* @@ -185,11 +209,13 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l area = get_vm_area(size, VM_IOREMAP); if (!area) return NULL; + addr = area->addr; if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) { vfree(addr); return NULL; } + return (void __iomem *) (offset + (char *)addr); #endif } |