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authorPaul Mundt <lethal@linux-sh.org>2009-10-16 18:20:42 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-10-16 18:20:42 +0900
commitcae19b5902d52ff059f5df98ea993a00e5686af1 (patch)
treefde9a56fba71bdb062c34f17a54ee156fa11ff0a /arch/sh/kernel
parent78aed4a63aaa67f22cb1b541dd7528139a24c289 (diff)
sh: Kill off legacy UBC wakeup cruft.
This code was added for some ancient SH-4 solution engines with peculiar boot ROMs that did silly things to the UBC MSTP bits. None of these have been in the wild for years, and these days the clock framework wraps up the MSTP bits, meaning that the UBC code is one of the few interfaces that is stomping MSTP bits underneath the clock framework. At this point the risks far outweigh any benefit this code provided, so just kill it off. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/cpu/Makefile1
-rw-r--r--arch/sh/kernel/cpu/init.c11
-rw-r--r--arch/sh/kernel/cpu/ubc.S59
3 files changed, 0 insertions, 71 deletions
diff --git a/arch/sh/kernel/cpu/Makefile b/arch/sh/kernel/cpu/Makefile
index 3d6b9312dc4..d97c803719e 100644
--- a/arch/sh/kernel/cpu/Makefile
+++ b/arch/sh/kernel/cpu/Makefile
@@ -15,7 +15,6 @@ obj-$(CONFIG_ARCH_SHMOBILE) += shmobile/
# Common interfaces.
-obj-$(CONFIG_UBC_WAKEUP) += ubc.o
obj-$(CONFIG_SH_ADC) += adc.o
obj-$(CONFIG_SH_CLK_CPG) += clock-cpg.o
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index e932ebef473..580d58b94cc 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -338,17 +338,6 @@ asmlinkage void __init sh_cpu_init(void)
}
#endif
- /*
- * Some brain-damaged loaders decided it would be a good idea to put
- * the UBC to sleep. This causes some issues when it comes to things
- * like PTRACE_SINGLESTEP or doing hardware watchpoints in GDB. So ..
- * we wake it up and hope that all is well.
- */
-#ifdef CONFIG_SUPERH32
- if (raw_smp_processor_id() == 0)
- ubc_wakeup();
-#endif
-
speculative_execution_init();
expmask_init();
}
diff --git a/arch/sh/kernel/cpu/ubc.S b/arch/sh/kernel/cpu/ubc.S
deleted file mode 100644
index 81923079fa1..00000000000
--- a/arch/sh/kernel/cpu/ubc.S
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * arch/sh/kernel/cpu/ubc.S
- *
- * Set of management routines for the User Break Controller (UBC)
- *
- * Copyright (C) 2002 Paul Mundt
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-#include <linux/linkage.h>
-#include <asm/ubc.h>
-
-#define STBCR2 0xffc00010
-
-ENTRY(ubc_sleep)
- mov #0, r0
-
- mov.l 1f, r1 ! Zero out UBC_BBRA ..
- mov.w r0, @r1
-
- mov.l 2f, r1 ! .. same for BBRB ..
- mov.w r0, @r1
-
- mov.l 3f, r1 ! .. and again for BRCR.
- mov.w r0, @r1
-
- mov.w @r1, r0 ! Dummy read BRCR
-
- mov.l 4f, r1 ! Set MSTP5 in STBCR2
- mov.b @r1, r0
- or #0x01, r0
- mov.b r0, @r1
-
- mov.b @r1, r0 ! Two dummy reads ..
- mov.b @r1, r0
-
- rts
- nop
-
-ENTRY(ubc_wakeup)
- mov.l 4f, r1 ! Clear MSTP5
- mov.b @r1, r0
- and #0xfe, r0
- mov.b r0, @r1
-
- mov.b @r1, r0 ! Two more dummy reads ..
- mov.b @r1, r0
-
- rts
- nop
-
-1: .long UBC_BBRA
-2: .long UBC_BBRB
-3: .long UBC_BRCR
-4: .long STBCR2
-