sh: SH-4A UBC support

A simple patch to enable the UBC on SH-4A.

Signed-off-by: Ryusuke Sakato <sakato@hsdv.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 0b1d5dd7a93b..91516dca4a85 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -5,6 +5,7 @@
  *  Copyright (C) 1995  Linus Torvalds
  *
  *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
+ *                   Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
  */
 
 /*
@@ -290,6 +291,24 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 static void
 ubc_set_tracing(int asid, unsigned long pc)
 {
+#if defined(CONFIG_CPU_SH4A)
+        unsigned long val;
+
+        val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE);
+        val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid));
+
+        ctrl_outl(val, UBC_CBR0);
+        ctrl_outl(pc,  UBC_CAR0);
+        ctrl_outl(0x0, UBC_CAMR0);
+        ctrl_outl(0x0, UBC_CBCR);
+
+        val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
+        ctrl_outl(val, UBC_CRR0);
+
+        /* Read UBC register that we writed last. For chekking UBC Register changed */
+        val = ctrl_inl(UBC_CRR0);
+
+#else   /* CONFIG_CPU_SH4A */
         ctrl_outl(pc, UBC_BARA);
 
 #ifdef CONFIG_MMU
@@ -307,6 +326,7 @@ ubc_set_tracing(int asid, unsigned long pc)
                 ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
                 ctrl_outw(BRCR_PCBA, UBC_BRCR);
         }
+#endif  /* CONFIG_CPU_SH4A */
 }
 
 /*
@@ -359,8 +379,13 @@ struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *ne
 #endif
                 ubc_set_tracing(asid, next->thread.ubc_pc);
         } else {
+#if defined(CONFIG_CPU_SH4A)
+                ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
+                ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
+#else
                 ctrl_outw(0, UBC_BBRA);
                 ctrl_outw(0, UBC_BBRB);
+#endif
         }
 
         return prev;
@@ -460,8 +485,13 @@ asmlinkage void break_point_trap(unsigned long r4, unsigned long r5,
                                  struct pt_regs regs)
 {
         /* Clear tracing.  */
+#if defined(CONFIG_CPU_SH4A)
+        ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
+        ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
+#else
         ctrl_outw(0, UBC_BBRA);
         ctrl_outw(0, UBC_BBRB);
+#endif
         current->thread.ubc_pc = 0;
         ubc_usercnt -= 1;