Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (187 commits)
  sh: remove dead LED code for migo-r and ms7724se
  sh: ecovec build fix for CONFIG_I2C=n
  sh: ecovec r-standby support
  sh: ms7724se r-standby support
  sh: SH-Mobile R-standby register save/restore
  clocksource: Fix up a registration/IRQ race in the sh drivers.
  sh: ms7724: modify scan_timing for KEYSC
  sh: ms7724: Add sh_sir support
  sh: mach-ecovec24: Add sh_sir support
  sh: wire up SET/GET_UNALIGN_CTL.
  sh: allow alignment fault mode to be configured at kernel boot.
  sh: sh7724: Update FSI/SPU2 clock
  sh: always enable sh7724 vpu_clk and set to 166MHz on Ecovec
  sh: add sh7724 kick callback to clk_div4_table
  sh: introduce struct clk_div4_table
  sh: clock-cpg div4 set_rate() shift fix
  sh: Turn on speculative return for SH7785 and SH7786
  sh: Merge legacy and dynamic PMB modes.
  sh: Use uncached I/O helpers in PMB setup.
  sh: Provide uncached I/O helpers.
  ...

1 files changed, 81 insertions, 0 deletions

diff --git a/arch/sh/mm/tlb-urb.c b/arch/sh/mm/tlb-urb.c
new file mode 100644
index 00000000000..bb5b9098956
--- /dev/null
+++ b/arch/sh/mm/tlb-urb.c
@@ -0,0 +1,81 @@
+/*
+ * arch/sh/mm/tlb-urb.c
+ *
+ * TLB entry wiring helpers for URB-equipped parts.
+ *
+ * Copyright (C) 2010  Matt Fleming
+ *
+ * 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/mm.h>
+#include <linux/io.h>
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+
+/*
+ * 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 = __raw_readl(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);
+	__raw_writel(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 = __raw_readl(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);
+	__raw_writel(status, MMUCR);
+	ctrl_barrier();
+
+	local_irq_restore(flags);
+}