Title: [4105] trunk/arch/blackfin/kernel/reboot.c: [#2424]
Add proper SW System Reset delay sequence
- Revision
- 4105
- Author
- hennerich
- Date
- 2008-01-16 01:20:27 -0600 (Wed, 16 Jan 2008)
Log Message
[#2424] Add proper SW System Reset delay sequence
Diffstat
reboot.c | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
Modified Paths
Diff
Modified: trunk/arch/blackfin/kernel/reboot.c (4104 => 4105)
--- trunk/arch/blackfin/kernel/reboot.c 2008-01-16 06:51:48 UTC (rev 4104)
+++ trunk/arch/blackfin/kernel/reboot.c 2008-01-16 07:20:27 UTC (rev 4105)
@@ -19,12 +19,18 @@
#define SYSCR_VAL 0x10
#endif
+/*
+ * Delay min 5 SCLK cycles using worst case CCLK/SCLK ratio (15)
+ */
+#define SWRST_DELAY (5 * 15)
+
/* A system soft reset makes external memory unusable
* so force this function into L1.
*/
__attribute__((l1_text))
void bfin_reset(void)
{
+ int cntr;
/* force BMODE and disable Core B (as needed) */
bfin_write_SYSCR(SYSCR_VAL);
@@ -34,12 +40,12 @@
while (1) {
/* initiate system soft reset with magic 0x7 */
bfin_write_SWRST(0x7);
- bfin_read_SWRST();
- asm("ssync;");
+ for (cntr = 0; cntr < SWRST_DELAY; cntr++)
+ asm("NOP;");
/* clear system soft reset */
bfin_write_SWRST(0);
- bfin_read_SWRST();
- asm("ssync;");
+ for (cntr = 0; cntr < SWRST_DELAY; cntr++)
+ asm("NOP;");
/* issue core reset */
asm("raise 1");
}
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