1 files changed, 144 insertions, 0 deletions

diff --git a/arch/sh/mm/ioremap_fixed.c b/arch/sh/mm/ioremap_fixed.c
new file mode 100644
index 000000000000..3a9d3d88fe8d
--- /dev/null
+++ b/arch/sh/mm/ioremap_fixed.c
@@ -0,0 +1,144 @@
+/*
+ * Re-map IO memory to kernel address space so that we can access it.
+ *
+ * These functions should only be used when it is necessary to map a
+ * physical address space into the kernel address space before ioremap()
+ * can be used, e.g. early in boot before paging_init().
+ *
+ * Copyright (C) 2009  Matt Fleming
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/bootmem.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <asm/fixmap.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/addrspace.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+
+struct ioremap_map {
+        void __iomem *addr;
+        unsigned long size;
+        unsigned long fixmap_addr;
+};
+
+static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
+
+void __init ioremap_fixed_init(void)
+{
+        struct ioremap_map *map;
+        int i;
+
+        for (i = 0; i < FIX_N_IOREMAPS; i++) {
+                map = &ioremap_maps[i];
+                map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
+        }
+}
+
+void __init __iomem *
+ioremap_fixed(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
+{
+        enum fixed_addresses idx0, idx;
+        resource_size_t last_addr;
+        struct ioremap_map *map;
+        unsigned long offset;
+        unsigned int nrpages;
+        int i, slot;
+
+        slot = -1;
+        for (i = 0; i < FIX_N_IOREMAPS; i++) {
+                map = &ioremap_maps[i];
+                if (!map->addr) {
+                        map->size = size;
+                        slot = i;
+                        break;
+                }
+        }
+
+        if (slot < 0)
+                return NULL;
+
+        /* Don't allow wraparound or zero size */
+        last_addr = phys_addr + size - 1;
+        if (!size || last_addr < phys_addr)
+                return NULL;
+
+        /*
+         * Fixmap mappings have to be page-aligned
+         */
+        offset = phys_addr & ~PAGE_MASK;
+        phys_addr &= PAGE_MASK;
+        size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+        /*
+         * Mappings have to fit in the FIX_IOREMAP area.
+         */
+        nrpages = size >> PAGE_SHIFT;
+        if (nrpages > FIX_N_IOREMAPS)
+                return NULL;
+
+        /*
+         * Ok, go for it..
+         */
+        idx0 = FIX_IOREMAP_BEGIN + slot;
+        idx = idx0;
+        while (nrpages > 0) {
+                pgprot_val(prot) |= _PAGE_WIRED;
+                __set_fixmap(idx, phys_addr, prot);
+                phys_addr += PAGE_SIZE;
+                idx++;
+                --nrpages;
+        }
+
+        map->addr = (void __iomem *)(offset + map->fixmap_addr);
+        return map->addr;
+}
+
+void __init iounmap_fixed(void __iomem *addr)
+{
+        enum fixed_addresses idx;
+        unsigned long virt_addr;
+        struct ioremap_map *map;
+        unsigned long offset;
+        unsigned int nrpages;
+        int i, slot;
+        pgprot_t prot;
+
+        slot = -1;
+        for (i = 0; i < FIX_N_IOREMAPS; i++) {
+                map = &ioremap_maps[i];
+                if (map->addr == addr) {
+                        slot = i;
+                        break;
+                }
+        }
+
+        if (slot < 0)
+                return;
+
+        virt_addr = (unsigned long)addr;
+
+        offset = virt_addr & ~PAGE_MASK;
+        nrpages = PAGE_ALIGN(offset + map->size - 1) >> PAGE_SHIFT;
+
+        pgprot_val(prot) = _PAGE_WIRED;
+
+        idx = FIX_IOREMAP_BEGIN + slot + nrpages;
+        while (nrpages > 0) {
+                __clear_fixmap(idx, prot);
+                --idx;
+                --nrpages;
+        }
+
+        map->size = 0;
+        map->addr = NULL;
+}