sh: Split out MMUCR.URB based entry wiring in to shared helper.

Presently this is duplicated between tlb-sh4 and tlb-pteaex. Split the
helpers out in to a generic tlb-urb that can be used by any parts
equipped with MMUCR.URB.

At the same time, move the SH-5 code out-of-line, as we require single
global state for DTLB entry wiring.

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

arch/sh/mm/tlb-sh4.c

@@ -81,69 +81,3 @@ void __uses_jump_to_uncached local_flush_tlb_one(unsigned long asid,
 	ctrl_outl(data, addr);
 	back_to_cached();
 }
-
-/*
- * Load the entry for 'addr' into the TLB and wire the entry.
- */
-void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
-{
-	unsigned long status, flags;
-	int urb;
-
-	local_irq_save(flags);
-
-	/* Load the entry into the TLB */
-	__update_tlb(vma, addr, pte);
-
-	/* ... and wire it up. */
-	status = ctrl_inl(MMUCR);
-	urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
-	status &= ~MMUCR_URB;
-
-	/*
-	 * Make sure we're not trying to wire the last TLB entry slot.
-	 */
-	BUG_ON(!--urb);
-
-	urb = urb % MMUCR_URB_NENTRIES;
-
-	status |= (urb << MMUCR_URB_SHIFT);
-	ctrl_outl(status, MMUCR);
-	ctrl_barrier();
-
-	local_irq_restore(flags);
-}
-
-/*
- * Unwire the last wired TLB entry.
- *
- * It should also be noted that it is not possible to wire and unwire
- * TLB entries in an arbitrary order. If you wire TLB entry N, followed
- * by entry N+1, you must unwire entry N+1 first, then entry N. In this
- * respect, it works like a stack or LIFO queue.
- */
-void tlb_unwire_entry(void)
-{
-	unsigned long status, flags;
-	int urb;
-
-	local_irq_save(flags);
-
-	status = ctrl_inl(MMUCR);
-	urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
-	status &= ~MMUCR_URB;
-
-	/*
-	 * Make sure we're not trying to unwire a TLB entry when none
-	 * have been wired.
-	 */
-	BUG_ON(urb++ == MMUCR_URB_NENTRIES);
-
-	urb = urb % MMUCR_URB_NENTRIES;
-
-	status |= (urb << MMUCR_URB_SHIFT);
-	ctrl_outl(status, MMUCR);
-	ctrl_barrier();
-
-	local_irq_restore(flags);
-}