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Diffstat (limited to 'arch/m68k/mm/sun3kmap.c')
-rw-r--r--arch/m68k/mm/sun3kmap.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/m68k/mm/sun3kmap.c b/arch/m68k/mm/sun3kmap.c
new file mode 100644
index 000000000000..7f0d86f3fe73
--- /dev/null
+++ b/arch/m68k/mm/sun3kmap.c
@@ -0,0 +1,156 @@
+/*
+ * linux/arch/m68k/mm/sun3kmap.c
+ *
+ * Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/sun3mmu.h>
+
+#undef SUN3_KMAP_DEBUG
+
+#ifdef SUN3_KMAP_DEBUG
+extern void print_pte_vaddr(unsigned long vaddr);
+#endif
+
+extern void mmu_emu_map_pmeg (int context, int vaddr);
+
+static inline void do_page_mapin(unsigned long phys, unsigned long virt,
+ unsigned long type)
+{
+ unsigned long pte;
+ pte_t ptep;
+
+ ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
+ pte = pte_val(ptep);
+ pte |= type;
+
+ sun3_put_pte(virt, pte);
+
+#ifdef SUN3_KMAP_DEBUG
+ print_pte_vaddr(virt);
+#endif
+
+}
+
+static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
+ unsigned long type, int pages)
+{
+
+ if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
+ mmu_emu_map_pmeg(sun3_get_context(), virt);
+
+ while(pages) {
+ do_page_mapin(phys, virt, type);
+ phys += PAGE_SIZE;
+ virt += PAGE_SIZE;
+ pages--;
+ }
+}
+
+void *sun3_ioremap(unsigned long phys, unsigned long size,
+ unsigned long type)
+{
+ struct vm_struct *area;
+ unsigned long offset, virt, ret;
+ int pages;
+
+ if(!size)
+ return NULL;
+
+ /* page align */
+ offset = phys & (PAGE_SIZE-1);
+ phys &= ~(PAGE_SIZE-1);
+
+ size += offset;
+ size = PAGE_ALIGN(size);
+ if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
+ return NULL;
+
+#ifdef SUN3_KMAP_DEBUG
+ printk("ioremap: got virt %p size %lx(%lx)\n",
+ area->addr, size, area->size);
+#endif
+
+ pages = size / PAGE_SIZE;
+ virt = (unsigned long)area->addr;
+ ret = virt + offset;
+
+ while(pages) {
+ int seg_pages;
+
+ seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
+ if(seg_pages > pages)
+ seg_pages = pages;
+
+ do_pmeg_mapin(phys, virt, type, seg_pages);
+
+ pages -= seg_pages;
+ phys += seg_pages * PAGE_SIZE;
+ virt += seg_pages * PAGE_SIZE;
+ }
+
+ return (void *)ret;
+
+}
+
+
+void *__ioremap(unsigned long phys, unsigned long size, int cache)
+{
+
+ return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
+
+}
+
+void iounmap(void *addr)
+{
+ vfree((void *)(PAGE_MASK & (unsigned long)addr));
+}
+
+/* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
+ * trapping the potential read fault. Returns 0 if the access faulted,
+ * 1 on success.
+ *
+ * This function is primarily used to check addresses on the VME bus.
+ *
+ * Mucking with the page fault handler seems a little hackish to me, but
+ * SunOS, NetBSD, and Mach all implemented this check in such a manner,
+ * so I figure we're allowed.
+ */
+int sun3_map_test(unsigned long addr, char *val)
+{
+ int ret = 0;
+
+ __asm__ __volatile__
+ (".globl _sun3_map_test_start\n"
+ "_sun3_map_test_start:\n"
+ "1: moveb (%2), (%0)\n"
+ " moveq #1, %1\n"
+ "2:\n"
+ ".section .fixup,\"ax\"\n"
+ ".even\n"
+ "3: moveq #0, %1\n"
+ " jmp 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ ".align 4\n"
+ ".long 1b,3b\n"
+ ".previous\n"
+ ".globl _sun3_map_test_end\n"
+ "_sun3_map_test_end:\n"
+ : "=a"(val), "=r"(ret)
+ : "a"(addr));
+
+ return ret;
+}