sh: Revert lazy dcache writeback changes.

These ended up causing too many problems on older parts,
revert for now..

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

1 files changed, 67 insertions, 1 deletions

diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 221e7095473..f74cf667c8f 100644
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -8,9 +8,74 @@
  *
  * Released under the terms of the GNU GPL v2.0.
  */
-#include <linux/io.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+
 #include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+void update_mmu_cache(struct vm_area_struct * vma,
+                      unsigned long address, pte_t pte)
+{
+        unsigned long flags;
+        unsigned long pteval;
+        unsigned long vpn;
+        struct page *page;
+        unsigned long pfn;
+
+        /* Ptrace may call this routine. */
+        if (vma && current->active_mm != vma->vm_mm)
+                return;
+
+        pfn = pte_pfn(pte);
+        if (pfn_valid(pfn)) {
+                page = pfn_to_page(pfn);
+                if (!test_bit(PG_mapped, &page->flags)) {
+                        unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
+                        __flush_wback_region((void *)P1SEGADDR(phys), PAGE_SIZE);
+                        __set_bit(PG_mapped, &page->flags);
+                }
+        }
+
+        local_irq_save(flags);
+
+        /* Set PTEH register */
+        vpn = (address & MMU_VPN_MASK) | get_asid();
+        ctrl_outl(vpn, MMU_PTEH);
+
+        pteval = pte_val(pte);
+
+        /* Set PTEA register */
+        if (cpu_data->flags & CPU_HAS_PTEA)
+                /* TODO: make this look less hacky */
+                ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
+
+        /* Set PTEL register */
+        pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
+#ifdef CONFIG_SH_WRITETHROUGH
+        pteval |= _PAGE_WT;
+#endif
+        /* conveniently, we want all the software flags to be 0 anyway */
+        ctrl_outl(pteval, MMU_PTEL);
+
+        /* Load the TLB */
+        asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
+        local_irq_restore(flags);
+}
 
 void local_flush_tlb_one(unsigned long asid, unsigned long page)
 {
@@ -28,3 +93,4 @@ void local_flush_tlb_one(unsigned long asid, unsigned long page)
         ctrl_outl(data, addr);
         back_to_P1();
 }
+