From cf8f2efb5f39c5225da92391c14a07eecbeca881 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Sat, 11 Oct 2008 21:49:06 -0400
Subject: [PATCH] Blackfin: handle new anomalies with reset
Workaround fun new anomalies related to software reset of the processor.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
cpu/blackfin/reset.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/cpu/blackfin/reset.c b/cpu/blackfin/reset.c
index d1e34b3f94..284cea579d 100644
--- a/cpu/blackfin/reset.c
+++ b/cpu/blackfin/reset.c
@@ -29,26 +29,35 @@ void bfin_reset(void)
*/
__builtin_bfin_ssync();
- while (1) {
+ /* 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);
/* Due to the way reset is handled in the hardware, we need
- * to delay for 7 SCLKS. The only reliable way to do this is
- * to calculate the CCLK/SCLK ratio and multiply 7. For now,
+ * 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 * 7)
+ : "a" (15 * 10)
: "LC0", "LB0", "LT0"
);
/* Clear System software reset */
bfin_write_SWRST(0);
+ /* The BF526 ROM will crash during reset */
+#if defined(__ADSPBF522__) || defined(__ADSPBF524__) || defined(__ADSPBF526__)
+ bfin_read_SWRST();
+#endif
+
/* Wait for the SWRST write to complete. Cannot rely on SSYNC
* though as the System state is all reset now.
*/
@@ -59,10 +68,11 @@ void bfin_reset(void)
: "a" (15 * 1)
: "LC1", "LB1", "LT1"
);
+ }
+ while (1)
/* Issue core reset */
asm("raise 1");
- }
}
/* We need to trampoline ourselves up into L1 since our linker
--
2.39.5