diff options
Diffstat (limited to 'arch/unicore32/mm')
| -rw-r--r-- | arch/unicore32/mm/Kconfig | 50 | ||||
| -rw-r--r-- | arch/unicore32/mm/Makefile | 15 | ||||
| -rw-r--r-- | arch/unicore32/mm/init.c | 517 | ||||
| -rw-r--r-- | arch/unicore32/mm/iomap.c | 56 | ||||
| -rw-r--r-- | arch/unicore32/mm/ioremap.c | 261 | ||||
| -rw-r--r-- | arch/unicore32/mm/mm.h | 39 |
6 files changed, 938 insertions, 0 deletions
diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig new file mode 100644 index 000000000000..5f77fb3c63be --- /dev/null +++ b/arch/unicore32/mm/Kconfig @@ -0,0 +1,50 @@ +comment "Processor Type" + +# Select CPU types depending on the architecture selected. This selects +# which CPUs we support in the kernel image, and the compiler instruction +# optimiser behaviour. + +config CPU_UCV2 + def_bool y + +comment "Processor Features" + +config CPU_ICACHE_DISABLE + bool "Disable I-Cache (I-bit)" + help + Say Y here to disable the processor instruction cache. Unless + you have a reason not to or are unsure, say N. + +config CPU_DCACHE_DISABLE + bool "Disable D-Cache (D-bit)" + help + Say Y here to disable the processor data cache. Unless + you have a reason not to or are unsure, say N. + +config CPU_DCACHE_WRITETHROUGH + bool "Force write through D-cache" + help + Say Y here to use the data cache in writethrough mode. Unless you + specifically require this or are unsure, say N. + +config CPU_DCACHE_LINE_DISABLE + bool "Disable D-cache line ops" + default y + help + Say Y here to disable the data cache line operations. + +config CPU_TLB_SINGLE_ENTRY_DISABLE + bool "Disable TLB single entry ops" + default y + help + Say Y here to disable the TLB single entry operations. + +config SWIOTLB + def_bool y + +config IOMMU_HELPER + def_bool SWIOTLB + +config NEED_SG_DMA_LENGTH + def_bool SWIOTLB + diff --git a/arch/unicore32/mm/Makefile b/arch/unicore32/mm/Makefile new file mode 100644 index 000000000000..f3ff41039f51 --- /dev/null +++ b/arch/unicore32/mm/Makefile @@ -0,0 +1,15 @@ +# +# Makefile for the linux unicore-specific parts of the memory manager. +# + +obj-y := extable.o fault.o init.o pgd.o mmu.o +obj-y += iomap.o flush.o ioremap.o + +obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o + +obj-$(CONFIG_MODULES) += proc-syms.o + +obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o + +obj-$(CONFIG_CPU_UCV2) += cache-ucv2.o tlb-ucv2.o proc-ucv2.o + diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c new file mode 100644 index 000000000000..3dbe3709b69d --- /dev/null +++ b/arch/unicore32/mm/init.c @@ -0,0 +1,517 @@ +/* + * linux/arch/unicore32/mm/init.c + * + * Copyright (C) 2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/swap.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/mman.h> +#include <linux/nodemask.h> +#include <linux/initrd.h> +#include <linux/highmem.h> +#include <linux/gfp.h> +#include <linux/memblock.h> +#include <linux/sort.h> +#include <linux/dma-mapping.h> + +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/sizes.h> +#include <asm/tlb.h> +#include <mach/map.h> + +#include "mm.h" + +static unsigned long phys_initrd_start __initdata = 0x01000000; +static unsigned long phys_initrd_size __initdata = SZ_8M; + +static int __init early_initrd(char *p) +{ + unsigned long start, size; + char *endp; + + start = memparse(p, &endp); + if (*endp == ',') { + size = memparse(endp + 1, NULL); + + phys_initrd_start = start; + phys_initrd_size = size; + } + return 0; +} +early_param("initrd", early_initrd); + +/* + * This keeps memory configuration data used by a couple memory + * initialization functions, as well as show_mem() for the skipping + * of holes in the memory map. It is populated by uc32_add_memory(). + */ +struct meminfo meminfo; + +void show_mem(void) +{ + int free = 0, total = 0, reserved = 0; + int shared = 0, cached = 0, slab = 0, i; + struct meminfo *mi = &meminfo; + + printk(KERN_DEFAULT "Mem-info:\n"); + show_free_areas(); + + for_each_bank(i, mi) { + struct membank *bank = &mi->bank[i]; + unsigned int pfn1, pfn2; + struct page *page, *end; + + pfn1 = bank_pfn_start(bank); + pfn2 = bank_pfn_end(bank); + + page = pfn_to_page(pfn1); + end = pfn_to_page(pfn2 - 1) + 1; + + do { + total++; + if (PageReserved(page)) + reserved++; + else if (PageSwapCache(page)) + cached++; + else if (PageSlab(page)) + slab++; + else if (!page_count(page)) + free++; + else + shared += page_count(page) - 1; + page++; + } while (page < end); + } + + printk(KERN_DEFAULT "%d pages of RAM\n", total); + printk(KERN_DEFAULT "%d free pages\n", free); + printk(KERN_DEFAULT "%d reserved pages\n", reserved); + printk(KERN_DEFAULT "%d slab pages\n", slab); + printk(KERN_DEFAULT "%d pages shared\n", shared); + printk(KERN_DEFAULT "%d pages swap cached\n", cached); +} + +static void __init find_limits(unsigned long *min, unsigned long *max_low, + unsigned long *max_high) +{ + struct meminfo *mi = &meminfo; + int i; + + *min = -1UL; + *max_low = *max_high = 0; + + for_each_bank(i, mi) { + struct membank *bank = &mi->bank[i]; + unsigned long start, end; + + start = bank_pfn_start(bank); + end = bank_pfn_end(bank); + + if (*min > start) + *min = start; + if (*max_high < end) + *max_high = end; + if (bank->highmem) + continue; + if (*max_low < end) + *max_low = end; + } +} + +static void __init uc32_bootmem_init(unsigned long start_pfn, + unsigned long end_pfn) +{ + struct memblock_region *reg; + unsigned int boot_pages; + phys_addr_t bitmap; + pg_data_t *pgdat; + + /* + * Allocate the bootmem bitmap page. This must be in a region + * of memory which has already been mapped. + */ + boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); + bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, + __pfn_to_phys(end_pfn)); + + /* + * Initialise the bootmem allocator, handing the + * memory banks over to bootmem. + */ + node_set_online(0); + pgdat = NODE_DATA(0); + init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); + + /* Free the lowmem regions from memblock into bootmem. */ + for_each_memblock(memory, reg) { + unsigned long start = memblock_region_memory_base_pfn(reg); + unsigned long end = memblock_region_memory_end_pfn(reg); + + if (end >= end_pfn) + end = end_pfn; + if (start >= end) + break; + + free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); + } + + /* Reserve the lowmem memblock reserved regions in bootmem. */ + for_each_memblock(reserved, reg) { + unsigned long start = memblock_region_reserved_base_pfn(reg); + unsigned long end = memblock_region_reserved_end_pfn(reg); + + if (end >= end_pfn) + end = end_pfn; + if (start >= end) + break; + + reserve_bootmem(__pfn_to_phys(start), + (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); + } +} + +static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low, + unsigned long max_high) +{ + unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; + struct memblock_region *reg; + + /* + * initialise the zones. + */ + memset(zone_size, 0, sizeof(zone_size)); + + /* + * The memory size has already been determined. If we need + * to do anything fancy with the allocation of this memory + * to the zones, now is the time to do it. + */ + zone_size[0] = max_low - min; + + /* + * Calculate the size of the holes. + * holes = node_size - sum(bank_sizes) + */ + memcpy(zhole_size, zone_size, sizeof(zhole_size)); + for_each_memblock(memory, reg) { + unsigned long start = memblock_region_memory_base_pfn(reg); + unsigned long end = memblock_region_memory_end_pfn(reg); + + if (start < max_low) { + unsigned long low_end = min(end, max_low); + zhole_size[0] -= low_end - start; + } + } + + /* + * Adjust the sizes according to any special requirements for + * this machine type. + */ + arch_adjust_zones(zone_size, zhole_size); + + free_area_init_node(0, zone_size, min, zhole_size); +} + +int pfn_valid(unsigned long pfn) +{ + return memblock_is_memory(pfn << PAGE_SHIFT); +} +EXPORT_SYMBOL(pfn_valid); + +static void uc32_memory_present(void) +{ +} + +static int __init meminfo_cmp(const void *_a, const void *_b) +{ + const struct membank *a = _a, *b = _b; + long cmp = bank_pfn_start(a) - bank_pfn_start(b); + return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; +} + +void __init uc32_memblock_init(struct meminfo *mi) +{ + int i; + + sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), + meminfo_cmp, NULL); + + memblock_init(); + for (i = 0; i < mi->nr_banks; i++) + memblock_add(mi->bank[i].start, mi->bank[i].size); + + /* Register the kernel text, kernel data and initrd with memblock. */ + memblock_reserve(__pa(_text), _end - _text); + +#ifdef CONFIG_BLK_DEV_INITRD + if (phys_initrd_size) { + memblock_reserve(phys_initrd_start, phys_initrd_size); + + /* Now convert initrd to virtual addresses */ + initrd_start = __phys_to_virt(phys_initrd_start); + initrd_end = initrd_start + phys_initrd_size; + } +#endif + + uc32_mm_memblock_reserve(); + + memblock_analyze(); + memblock_dump_all(); +} + +void __init bootmem_init(void) +{ + unsigned long min, max_low, max_high; + + max_low = max_high = 0; + + find_limits(&min, &max_low, &max_high); + + uc32_bootmem_init(min, max_low); + +#ifdef CONFIG_SWIOTLB + swiotlb_init(1); +#endif + /* + * Sparsemem tries to allocate bootmem in memory_present(), + * so must be done after the fixed reservations + */ + uc32_memory_present(); + + /* + * sparse_init() needs the bootmem allocator up and running. + */ + sparse_init(); + + /* + * Now free the memory - free_area_init_node needs + * the sparse mem_map arrays initialized by sparse_init() + * for memmap_init_zone(), otherwise all PFNs are invalid. + */ + uc32_bootmem_free(min, max_low, max_high); + + high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; + + /* + * This doesn't seem to be used by the Linux memory manager any + * more, but is used by ll_rw_block. If we can get rid of it, we + * also get rid of some of the stuff above as well. + * + * Note: max_low_pfn and max_pfn reflect the number of _pages_ in + * the system, not the maximum PFN. + */ + max_low_pfn = max_low - PHYS_PFN_OFFSET; + max_pfn = max_high - PHYS_PFN_OFFSET; +} + +static inline int free_area(unsigned long pfn, unsigned long end, char *s) +{ + unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); + + for (; pfn < end; pfn++) { + struct page *page = pfn_to_page(pfn); + ClearPageReserved(page); + init_page_count(page); + __free_page(page); + pages++; + } + + if (size && s) + printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); + + return pages; +} + +static inline void +free_memmap(unsigned long start_pfn, unsigned long end_pfn) +{ + struct page *start_pg, *end_pg; + unsigned long pg, pgend; + + /* + * Convert start_pfn/end_pfn to a struct page pointer. + */ + start_pg = pfn_to_page(start_pfn - 1) + 1; + end_pg = pfn_to_page(end_pfn); + + /* + * Convert to physical addresses, and + * round start upwards and end downwards. + */ + pg = PAGE_ALIGN(__pa(start_pg)); + pgend = __pa(end_pg) & PAGE_MASK; + + /* + * If there are free pages between these, + * free the section of the memmap array. + */ + if (pg < pgend) + free_bootmem(pg, pgend - pg); +} + +/* + * The mem_map array can get very big. Free the unused area of the memory map. + */ +static void __init free_unused_memmap(struct meminfo *mi) +{ + unsigned long bank_start, prev_bank_end = 0; + unsigned int i; + + /* + * This relies on each bank being in address order. + * The banks are sorted previously in bootmem_init(). + */ + for_each_bank(i, mi) { + struct membank *bank = &mi->bank[i]; + + bank_start = bank_pfn_start(bank); + + /* + * If we had a previous bank, and there is a space + * between the current bank and the previous, free it. + */ + if (prev_bank_end && prev_bank_end < bank_start) + free_memmap(prev_bank_end, bank_start); + + /* + * Align up here since the VM subsystem insists that the + * memmap entries are valid from the bank end aligned to + * MAX_ORDER_NR_PAGES. + */ + prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); + } +} + +/* + * mem_init() marks the free areas in the mem_map and tells us how much + * memory is free. This is done after various parts of the system have + * claimed their memory after the kernel image. + */ +void __init mem_init(void) +{ + unsigned long reserved_pages, free_pages; + struct memblock_region *reg; + int i; + + max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; + + /* this will put all unused low memory onto the freelists */ + free_unused_memmap(&meminfo); + + totalram_pages += free_all_bootmem(); + + reserved_pages = free_pages = 0; + + for_each_bank(i, &meminfo) { + struct membank *bank = &meminfo.bank[i]; + unsigned int pfn1, pfn2; + struct page *page, *end; + + pfn1 = bank_pfn_start(bank); + pfn2 = bank_pfn_end(bank); + + page = pfn_to_page(pfn1); + end = pfn_to_page(pfn2 - 1) + 1; + + do { + if (PageReserved(page)) + reserved_pages++; + else if (!page_count(page)) + free_pages++; + page++; + } while (page < end); + } + + /* + * Since our memory may not be contiguous, calculate the + * real number of pages we have in this system + */ + printk(KERN_INFO "Memory:"); + num_physpages = 0; + for_each_memblock(memory, reg) { + unsigned long pages = memblock_region_memory_end_pfn(reg) - + memblock_region_memory_base_pfn(reg); + num_physpages += pages; + printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); + } + printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); + + printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", + nr_free_pages() << (PAGE_SHIFT-10), + free_pages << (PAGE_SHIFT-10), + reserved_pages << (PAGE_SHIFT-10), + totalhigh_pages << (PAGE_SHIFT-10)); + + printk(KERN_NOTICE "Virtual kernel memory layout:\n" + " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" + " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" + " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" + " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" + " .init : 0x%p" " - 0x%p" " (%4d kB)\n" + " .text : 0x%p" " - 0x%p" " (%4d kB)\n" + " .data : 0x%p" " - 0x%p" " (%4d kB)\n", + + VECTORS_BASE, VECTORS_BASE + PAGE_SIZE, + DIV_ROUND_UP(PAGE_SIZE, SZ_1K), + VMALLOC_START, VMALLOC_END, + DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M), + PAGE_OFFSET, (unsigned long)high_memory, + DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M), + MODULES_VADDR, MODULES_END, + DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M), + + __init_begin, __init_end, + DIV_ROUND_UP((__init_end - __init_begin), SZ_1K), + _stext, _etext, + DIV_ROUND_UP((_etext - _stext), SZ_1K), + _sdata, _edata, + DIV_ROUND_UP((_edata - _sdata), SZ_1K)); + + BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); + BUG_ON(TASK_SIZE > MODULES_VADDR); + + if (PAGE_SIZE >= 16384 && num_physpages <= 128) { + /* + * On a machine this small we won't get + * anywhere without overcommit, so turn + * it on by default. + */ + sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; + } +} + +void free_initmem(void) +{ + totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), + __phys_to_pfn(__pa(__init_end)), + "init"); +} + +#ifdef CONFIG_BLK_DEV_INITRD + +static int keep_initrd; + +void free_initrd_mem(unsigned long start, unsigned long end) +{ + if (!keep_initrd) + totalram_pages += free_area(__phys_to_pfn(__pa(start)), + __phys_to_pfn(__pa(end)), + "initrd"); +} + +static int __init keepinitrd_setup(char *__unused) +{ + keep_initrd = 1; + return 1; +} + +__setup("keepinitrd", keepinitrd_setup); +#endif diff --git a/arch/unicore32/mm/iomap.c b/arch/unicore32/mm/iomap.c new file mode 100644 index 000000000000..a7e1a3d2e069 --- /dev/null +++ b/arch/unicore32/mm/iomap.c @@ -0,0 +1,56 @@ +/* + * linux/arch/unicore32/mm/iomap.c + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Map IO port and PCI memory spaces so that {read,write}[bwl] can + * be used to access this memory. + */ +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/ioport.h> +#include <linux/io.h> + +#ifdef __io +void __iomem *ioport_map(unsigned long port, unsigned int nr) +{ + /* we map PC lagcy 64K IO port to PCI IO space 0x80030000 */ + return (void __iomem *) (unsigned long) + io_p2v((port & 0xffff) + PKUNITY_PCILIO_BASE); +} +EXPORT_SYMBOL(ioport_map); + +void ioport_unmap(void __iomem *addr) +{ +} +EXPORT_SYMBOL(ioport_unmap); +#endif + +#ifdef CONFIG_PCI +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) +{ + resource_size_t start = pci_resource_start(dev, bar); + resource_size_t len = pci_resource_len(dev, bar); + unsigned long flags = pci_resource_flags(dev, bar); + + if (!len || !start) + return NULL; + if (maxlen && len > maxlen) + len = maxlen; + if (flags & IORESOURCE_IO) + return ioport_map(start, len); + if (flags & IORESOURCE_MEM) { + if (flags & IORESOURCE_CACHEABLE) + return ioremap(start, len); + return ioremap_nocache(start, len); + } + return NULL; +} +EXPORT_SYMBOL(pci_iomap); +#endif diff --git a/arch/unicore32/mm/ioremap.c b/arch/unicore32/mm/ioremap.c new file mode 100644 index 000000000000..b7a605597b08 --- /dev/null +++ b/arch/unicore32/mm/ioremap.c @@ -0,0 +1,261 @@ +/* + * linux/arch/unicore32/mm/ioremap.c + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * + * 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 <asm/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)) { + printk(KERN_WARNING "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"); + WARN_ON(1); + } + + 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 __iomem * +__uc32_ioremap_cached(unsigned long phys_addr, size_t size) +{ + return __uc32_ioremap_caller(phys_addr, size, MT_DEVICE_CACHED, + __builtin_return_address(0)); +} +EXPORT_SYMBOL(__uc32_ioremap_cached); + +void __uc32_iounmap(volatile void __iomem *io_addr) +{ + void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); + struct vm_struct **p, *tmp; + + /* + * 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. + */ + write_lock(&vmlist_lock); + for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) { + if ((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) { + if (tmp->flags & VM_UNICORE_SECTION_MAPPING) { + unmap_area_sections((unsigned long)tmp->addr, + tmp->size); + } + break; + } + } + write_unlock(&vmlist_lock); + + vunmap(addr); +} +EXPORT_SYMBOL(__uc32_iounmap); diff --git a/arch/unicore32/mm/mm.h b/arch/unicore32/mm/mm.h new file mode 100644 index 000000000000..3296bca0f1f7 --- /dev/null +++ b/arch/unicore32/mm/mm.h @@ -0,0 +1,39 @@ +/* + * linux/arch/unicore32/mm/mm.h + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +/* the upper-most page table pointer */ +extern pmd_t *top_pmd; +extern int sysctl_overcommit_memory; + +#define TOP_PTE(x) pte_offset_kernel(top_pmd, x) + +static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt) +{ + return pmd_offset((pud_t *)pgd, virt); +} + +static inline pmd_t *pmd_off_k(unsigned long virt) +{ + return pmd_off(pgd_offset_k(virt), virt); +} + +struct mem_type { + unsigned int prot_pte; + unsigned int prot_l1; + unsigned int prot_sect; +}; + +const struct mem_type *get_mem_type(unsigned int type); + +extern void __flush_dcache_page(struct address_space *, struct page *); + +void __init bootmem_init(void); +void uc32_mm_memblock_reserve(void); |