Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2714d9a6d1e68d30f5be8871722a7cff388c2d74
Commit: 2714d9a6d1e68d30f5be8871722a7cff388c2d74
Parent: 4b3f058a7a34a10d99937e86bb28da118710ca9a
Author: Michael Hennerich <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 00:29:49 2007 +0800
Committer: Bryan Wu <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 00:29:49 2007 +0800
Blackfin arch: Workaround reboot bug, issue SSYNC at the start of bfin_reset
reboot failes on BF533
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3500
Signed-off-by: Michael Hennerich <[EMAIL PROTECTED]>
Signed-off-by: Bryan Wu <[EMAIL PROTECTED]>
---
arch/blackfin/kernel/reboot.c | 78 +++++++++++++++++++++++++++++++++++++++++
include/asm-blackfin/reboot.h | 20 ++++++++++
2 files changed, 98 insertions(+), 0 deletions(-)
diff --git a/arch/blackfin/kernel/reboot.c b/arch/blackfin/kernel/reboot.c
new file mode 100644
index 0000000..356078e
--- /dev/null
+++ b/arch/blackfin/kernel/reboot.c
@@ -0,0 +1,78 @@
+/*
+ * arch/blackfin/kernel/reboot.c - handle shutdown/reboot
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <asm/bfin-global.h>
+#include <asm/reboot.h>
+#include <asm/system.h>
+
+#if defined(BF537_FAMILY) || defined(BF533_FAMILY)
+#define SYSCR_VAL 0x0
+#elif defined(BF561_FAMILY)
+#define SYSCR_VAL 0x20
+#elif defined(BF548_FAMILY)
+#define SYSCR_VAL 0x10
+#endif
+
+/* A system soft reset makes external memory unusable
+ * so force this function into L1.
+ */
+__attribute__((l1_text))
+void bfin_reset(void)
+{
+ /* force BMODE and disable Core B (as needed) */
+ bfin_write_SYSCR(SYSCR_VAL);
+
+ /* we use asm ssync here because it's save and we save some L1 */
+ asm("ssync;");
+
+ while (1) {
+ /* initiate system soft reset with magic 0x7 */
+ bfin_write_SWRST(0x7);
+ asm("ssync;");
+ /* clear system soft reset */
+ bfin_write_SWRST(0);
+ asm("ssync;");
+ /* issue core reset */
+ asm("raise 1");
+ }
+}
+
+__attribute__((weak))
+void native_machine_restart(char *cmd)
+{
+}
+
+void machine_restart(char *cmd)
+{
+ native_machine_restart(cmd);
+ local_irq_disable();
+ bfin_reset();
+}
+
+__attribute__((weak))
+void native_machine_halt(void)
+{
+ idle_with_irq_disabled();
+}
+
+void machine_halt(void)
+{
+ native_machine_halt();
+}
+
+__attribute__((weak))
+void native_machine_power_off(void)
+{
+ idle_with_irq_disabled();
+}
+
+void machine_power_off(void)
+{
+ native_machine_power_off();
+}
diff --git a/include/asm-blackfin/reboot.h b/include/asm-blackfin/reboot.h
new file mode 100644
index 0000000..6d448b5
--- /dev/null
+++ b/include/asm-blackfin/reboot.h
@@ -0,0 +1,20 @@
+/*
+ * include/asm-blackfin/reboot.h - shutdown/reboot header
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_REBOOT_H__
+#define __ASM_REBOOT_H__
+
+/* optional board specific hooks */
+extern void native_machine_restart(char *cmd);
+extern void native_machine_halt(void);
+extern void native_machine_power_off(void);
+
+/* common reboot workarounds */
+extern void bfin_gpio_reset_spi0_ssel1(void);
+
+#endif
-
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