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authorMike Frysinger <vapier@gentoo.org>2011-04-30 04:35:21 -0400
committerMike Frysinger <vapier@gentoo.org>2011-06-03 13:26:45 -0400
commit9aeab10bd4ae31518ec8a21c51f4e3b16c66a1ee (patch)
tree27774c2960a06ef2c8371ada516b63c85676db03 /arch/blackfin/cpu
parent867f54cc35aafd3179fd3b6efbeacf5978ce53b9 (diff)
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Blackfin: use on-chip reset func with newer parts
Turns out the documentation is wrong and doing "RAISE 1" does not result in a software reset, only a core reset. So when the on-chip rom has a functioning reset helper, use it. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/cpu')
-rw-r--r--arch/blackfin/cpu/reset.c70
1 files changed, 34 insertions, 36 deletions
diff --git a/arch/blackfin/cpu/reset.c b/arch/blackfin/cpu/reset.c
index 9307e9f..e23dcc7 100644
--- a/arch/blackfin/cpu/reset.c
+++ b/arch/blackfin/cpu/reset.c
@@ -9,6 +9,7 @@
#include <common.h>
#include <command.h>
#include <asm/blackfin.h>
+#include <asm/mach-common/bits/bootrom.h>
#include "cpu.h"
/* A system soft reset makes external memory unusable so force
@@ -29,46 +30,40 @@ static void bfin_reset(void)
*/
__builtin_bfin_ssync();
- /* The bootrom checks to see how it was reset and will
- * automatically perform a software reset for us when
- * it starts executing after the core reset.
- */
- if (ANOMALY_05000353 || ANOMALY_05000386) {
- /* Initiate System software reset. */
- bfin_write_SWRST(0x7);
+ /* Initiate System software reset. */
+ bfin_write_SWRST(0x7);
- /* Due to the way reset is handled in the hardware, we need
- * to delay for 10 SCLKS. The only reliable way to do this is
- * to calculate the CCLK/SCLK ratio and multiply 10. For now,
- * we'll assume worse case which is a 1:15 ratio.
- */
- asm(
- "LSETUP (1f, 1f) LC0 = %0\n"
- "1: nop;"
- :
- : "a" (15 * 10)
- : "LC0", "LB0", "LT0"
- );
+ /* Due to the way reset is handled in the hardware, we need
+ * to delay for 10 SCLKS. The only reliable way to do this is
+ * to calculate the CCLK/SCLK ratio and multiply 10. For now,
+ * we'll assume worse case which is a 1:15 ratio.
+ */
+ asm(
+ "LSETUP (1f, 1f) LC0 = %0\n"
+ "1: nop;"
+ :
+ : "a" (15 * 10)
+ : "LC0", "LB0", "LT0"
+ );
- /* Clear System software reset */
- bfin_write_SWRST(0);
+ /* Clear System software reset */
+ bfin_write_SWRST(0);
- /* The BF526 ROM will crash during reset */
+ /* The BF526 ROM will crash during reset */
#if defined(__ADSPBF522__) || defined(__ADSPBF524__) || defined(__ADSPBF526__)
- bfin_read_SWRST();
+ bfin_read_SWRST();
#endif
- /* Wait for the SWRST write to complete. Cannot rely on SSYNC
- * though as the System state is all reset now.
- */
- asm(
- "LSETUP (1f, 1f) LC1 = %0\n"
- "1: nop;"
- :
- : "a" (15 * 1)
- : "LC1", "LB1", "LT1"
- );
- }
+ /* Wait for the SWRST write to complete. Cannot rely on SSYNC
+ * though as the System state is all reset now.
+ */
+ asm(
+ "LSETUP (1f, 1f) LC1 = %0\n"
+ "1: nop;"
+ :
+ : "a" (15 * 1)
+ : "LC1", "LB1", "LT1"
+ );
while (1)
/* Issue core reset */
@@ -84,7 +79,10 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (board_reset)
board_reset();
- while (1)
- asm("jump (%0);" : : "a" (bfin_reset));
+ if (ANOMALY_05000353 || ANOMALY_05000386)
+ while (1)
+ asm("jump (%0);" : : "a" (bfin_reset));
+ else
+ bfrom_SoftReset((void *)(L1_SRAM_SCRATCH_END - 20));
return 0;
}