sh: Provide the kmap_coherent() interface generically.

This plugs in kmap_coherent() for the non-SH4 cases to permit the
pg-mmu.c bits to be used generically across all CPUs. SH-5 is still in
the TODO state, but will move over to fixmap and the generic interface
gradually.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

5 files changed, 95 insertions, 49 deletions

diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32
index 17b02522214f..30771b137f48 100644
--- a/arch/sh/mm/Makefile_32
+++ b/arch/sh/mm/Makefile_32
@@ -15,7 +15,7 @@ endif
 obj-y                   += $(cache-y)
 
 mmu-y                   := tlb-nommu.o pg-nommu.o
-mmu-$(CONFIG_MMU)       := fault_32.o tlbflush_32.o ioremap_32.o pg-mmu.o
+mmu-$(CONFIG_MMU)       := fault_32.o kmap.o tlbflush_32.o ioremap_32.o pg-mmu.o
 
 obj-y                   += $(mmu-y)
 obj-$(CONFIG_DEBUG_FS)  += asids-debugfs.o
diff --git a/arch/sh/mm/cache-sh5.c b/arch/sh/mm/cache-sh5.c
index 698113fce814..28f3c8fb1b99 100644
--- a/arch/sh/mm/cache-sh5.c
+++ b/arch/sh/mm/cache-sh5.c
@@ -29,6 +29,21 @@ void __init p3_cache_init(void)
         dtlb_cache_slot = sh64_get_wired_dtlb_entry();
 }
 
+void __init kmap_coherent_init(void)
+{
+        /* XXX ... */
+}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+        /* XXX ... */
+        return NULL;
+}
+
+void kunmap_coherent(void)
+{
+}
+
 #ifdef CONFIG_DCACHE_DISABLED
 #define sh64_dcache_purge_all()                                 do { } while (0)
 #define sh64_dcache_purge_coloured_phy_page(paddr, eaddr)       do { } while (0)
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
new file mode 100644
index 000000000000..3eecf0d42f1a
--- /dev/null
+++ b/arch/sh/mm/kmap.c
@@ -0,0 +1,64 @@
+/*
+ * arch/sh/mm/kmap.c
+ *
+ * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
+ * Copyright (C) 2002 - 2009  Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+#define kmap_get_fixmap_pte(vaddr)                                     \
+        pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
+
+static pte_t *kmap_coherent_pte;
+
+void __init kmap_coherent_init(void)
+{
+        unsigned long vaddr;
+
+        if (!boot_cpu_data.dcache.n_aliases)
+                return;
+
+        /* cache the first coherent kmap pte */
+        vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
+        kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
+}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+        enum fixed_addresses idx;
+        unsigned long vaddr, flags;
+        pte_t pte;
+
+        BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
+
+        inc_preempt_count();
+
+        idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;
+        vaddr = __fix_to_virt(FIX_CMAP_END - idx);
+        pte = mk_pte(page, PAGE_KERNEL);
+
+        local_irq_save(flags);
+        flush_tlb_one(get_asid(), vaddr);
+        local_irq_restore(flags);
+
+        update_mmu_cache(NULL, vaddr, pte);
+
+        set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
+
+        return (void *)vaddr;
+}
+
+void kunmap_coherent(void)
+{
+        dec_preempt_count();
+        preempt_check_resched();
+}
diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
index 7a6ef34bd499..f51d0a4eb3ba 100644
--- a/arch/sh/mm/pg-mmu.c
+++ b/arch/sh/mm/pg-mmu.c
@@ -15,54 +15,6 @@
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 
-#define kmap_get_fixmap_pte(vaddr)                                     \
-        pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
-
-static pte_t *kmap_coherent_pte;
-
-void __init kmap_coherent_init(void)
-{
-        unsigned long vaddr;
-
-        if (!boot_cpu_data.dcache.n_aliases)
-                return;
-
-        /* cache the first coherent kmap pte */
-        vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
-        kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
-}
-
-static void *kmap_coherent(struct page *page, unsigned long addr)
-{
-        enum fixed_addresses idx;
-        unsigned long vaddr, flags;
-        pte_t pte;
-
-        BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
-
-        inc_preempt_count();
-
-        idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;
-        vaddr = __fix_to_virt(FIX_CMAP_END - idx);
-        pte = mk_pte(page, PAGE_KERNEL);
-
-        local_irq_save(flags);
-        flush_tlb_one(get_asid(), vaddr);
-        local_irq_restore(flags);
-
-        update_mmu_cache(NULL, vaddr, pte);
-
-        set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
-
-        return (void *)vaddr;
-}
-
-static inline void kunmap_coherent(void)
-{
-        dec_preempt_count();
-        preempt_check_resched();
-}
-
 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
                        unsigned long vaddr, void *dst, const void *src,
                        unsigned long len)
diff --git a/arch/sh/mm/tlb-nommu.c b/arch/sh/mm/tlb-nommu.c
index 0ef5429943df..c49e9d24c2e6 100644
--- a/arch/sh/mm/tlb-nommu.c
+++ b/arch/sh/mm/tlb-nommu.c
@@ -55,6 +55,21 @@ void __update_cache(struct vm_area_struct *vma,
 {
 }
 
+void __init kmap_coherent_init(void)
+{
+}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+        BUG();
+        return NULL;
+}
+
+void kunmap_coherent(void)
+{
+        BUG();
+}
+
 void __init page_table_range_init(unsigned long start, unsigned long end,
                                   pgd_t *pgd_base)
 {