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>

diff --git a/arch/sh/include/asm/cacheflush.h b/arch/sh/include/asm/cacheflush.h
index 5dffbd126e469b69eca0654627de7ea7da8c9b44..0e87e87cc01fd4c37c39cfb68069804008abedba 100644 (file)
--- a/arch/sh/include/asm/cacheflush.h
+++ b/arch/sh/include/asm/cacheflush.h
@@ -74,5 +74,9 @@ extern void copy_from_user_page(struct vm_area_struct *vma,
 #define flush_cache_vmap(start, end)           flush_cache_all()
 #define flush_cache_vunmap(start, end)         flush_cache_all()
 
+void kmap_coherent_init(void);
+void *kmap_coherent(struct page *page, unsigned long addr);
+void kunmap_coherent(void);
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_SH_CACHEFLUSH_H */

diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 3cd7127af9574f3633689a4fb81d445c0bb956e1..4f3efa7d5a6458625e796cffe28eb1498e13fc9b 100644 (file)
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -158,12 +158,6 @@ extern void paging_init(void);
 extern void page_table_range_init(unsigned long start, unsigned long end,
                                  pgd_t *pgd);
 
-#if defined(CONFIG_MMU) && !defined(CONFIG_CPU_SH5)
-extern void kmap_coherent_init(void);
-#else
-#define kmap_coherent_init()   do { } while (0)
-#endif
-
 /* arch/sh/mm/mmap.c */
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN

diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32
index 17b02522214fc4e70cff6e7eb7937b62722e7516..30771b137f4829aad89969196dbd5b70baedd8fe 100644 (file)
--- 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 698113fce8147dc9d8f3df5d9f18edf30ceadb00..28f3c8fb1b9964ebdd1cc749e8adb80a10e86fb7 100644 (file)
--- 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 (file)
index 0000000..3eecf0d
--- /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 7a6ef34bd499152261b7366ea6d7cbfbe9f0075f..f51d0a4eb3ba78c43676555be39a2f54738a2be2 100644 (file)
--- 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 0ef5429943dfe646858cf590a00de59255f8dcfd..c49e9d24c2e6fe7870719bfa6ea272eeed0b9dfb 100644 (file)
--- 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)
 {