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Subject[PATCH 18/32] Blackfin arch: issue reset via SWRST so we dont clobber the watchdog state
Date
From: Mike Frysinger <michael.frysinger@analog.com>

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
arch/blackfin/mach-bf533/head.S | 68 +++++++++-----------------------------
arch/blackfin/mach-bf537/head.S | 70 +++++++++------------------------------
arch/blackfin/mach-bf561/head.S | 70 +++++++++------------------------------
3 files changed, 48 insertions(+), 160 deletions(-)

diff --git a/arch/blackfin/mach-bf533/head.S b/arch/blackfin/mach-bf533/head.S
index 7cb8258..1a54ff5 100644
--- a/arch/blackfin/mach-bf533/head.S
+++ b/arch/blackfin/mach-bf533/head.S
@@ -481,66 +481,30 @@ ENTRY(_bfin_reset)
[p0] = r0;
SSYNC;

- /* Disable the WDOG TIMER */
- p0.h = hi(WDOG_CTL);
- p0.l = lo(WDOG_CTL);
- r0.l = 0xAD6;
- w[p0] = r0.l;
- SSYNC;
-
- /* Clear the sticky bit incase it is already set */
- p0.h = hi(WDOG_CTL);
- p0.l = lo(WDOG_CTL);
- r0.l = 0x8AD6;
- w[p0] = r0.l;
+ /* make sure SYSCR is set to use BMODE */
+ P0.h = hi(SYSCR);
+ P0.l = lo(SYSCR);
+ R0.l = 0x0;
+ W[P0] = R0.l;
SSYNC;

- /* Program the count value */
- R0.l = 0x100;
- R0.h = 0x0;
- P0.h = hi(WDOG_CNT);
- P0.l = lo(WDOG_CNT);
- [P0] = R0;
+ /* issue a system soft reset */
+ P1.h = hi(SWRST);
+ P1.l = lo(SWRST);
+ R1.l = 0x0007;
+ W[P1] = R1;
SSYNC;

- /* Program WDOG_STAT if necessary */
- P0.h = hi(WDOG_CTL);
- P0.l = lo(WDOG_CTL);
- R0 = W[P0](Z);
- CC = BITTST(R0,1);
- if !CC JUMP .LWRITESTAT;
- CC = BITTST(R0,2);
- if !CC JUMP .LWRITESTAT;
- JUMP .LSKIP_WRITE;
-
-.LWRITESTAT:
- /* When watch dog timer is enabled, a write to STAT will load the contents of CNT to STAT */
- R0 = 0x0000(z);
- P0.h = hi(WDOG_STAT);
- P0.l = lo(WDOG_STAT)
- [P0] = R0;
- SSYNC;
-
-.LSKIP_WRITE:
- /* Enable the reset event */
- P0.h = hi(WDOG_CTL);
- P0.l = lo(WDOG_CTL);
- R0 = W[P0](Z);
- BITCLR(R0,1);
- BITCLR(R0,2);
- W[P0] = R0.L;
- SSYNC;
- NOP;
-
- /* Enable the wdog counter */
- R0 = W[P0](Z);
- BITCLR(R0,4);
- W[P0] = R0.L;
+ /* clear system soft reset */
+ R0.l = 0x0000;
+ W[P0] = R0;
SSYNC;

- IDLE;
+ /* issue core reset */
+ raise 1;

RTS;
+ENDPROC(_bfin_reset)

#if CONFIG_DEBUG_KERNEL_START
debug_kernel_start_trap:
diff --git a/arch/blackfin/mach-bf537/head.S b/arch/blackfin/mach-bf537/head.S
index de78e42..aafc686 100644
--- a/arch/blackfin/mach-bf537/head.S
+++ b/arch/blackfin/mach-bf537/head.S
@@ -517,68 +517,30 @@ _delay_lab1_end:
[p0] = r0;
SSYNC;

- /* Disable the WDOG TIMER */
- p0.h = hi(WDOG_CTL);
- p0.l = lo(WDOG_CTL);
- r0.l = 0xAD6;
- w[p0] = r0.l;
+ /* make sure SYSCR is set to use BMODE */
+ P0.h = hi(SYSCR);
+ P0.l = lo(SYSCR);
+ R0.l = 0x0;
+ W[P0] = R0.l;
SSYNC;

- /* Clear the sticky bit incase it is already set */
- p0.h = hi(WDOG_CTL);
- p0.l = lo(WDOG_CTL);
- r0.l = 0x8AD6;
- w[p0] = r0.l;
+ /* issue a system soft reset */
+ P1.h = hi(SWRST);
+ P1.l = lo(SWRST);
+ R1.l = 0x0007;
+ W[P1] = R1;
SSYNC;

- /* Program the count value */
- R0.l = 0x100;
- R0.h = 0x0;
- P0.h = hi(WDOG_CNT);
- P0.l = lo(WDOG_CNT);
- [P0] = R0;
- SSYNC;
-
- /* Program WDOG_STAT if necessary */
- P0.h = hi(WDOG_CTL);
- P0.l = lo(WDOG_CTL);
- R0 = W[P0](Z);
- CC = BITTST(R0,1);
- if !CC JUMP .LWRITESTAT;
- CC = BITTST(R0,2);
- if !CC JUMP .LWRITESTAT;
- JUMP .LSKIP_WRITE;
-
-.LWRITESTAT:
- /* When watch dog timer is enabled,
- * a write to STAT will load the contents of CNT to STAT
- */
- R0 = 0x0000(z);
- P0.h = hi(WDOG_STAT);
- P0.l = lo(WDOG_STAT)
- [P0] = R0;
- SSYNC;
-
-.LSKIP_WRITE:
- /* Enable the reset event */
- P0.h = hi(WDOG_CTL);
- P0.l = lo(WDOG_CTL);
- R0 = W[P0](Z);
- BITCLR(R0,1);
- BITCLR(R0,2);
- W[P0] = R0.L;
- SSYNC;
- NOP;
-
- /* Enable the wdog counter */
- R0 = W[P0](Z);
- BITCLR(R0,4);
- W[P0] = R0.L;
+ /* clear system soft reset */
+ R0.l = 0x0000;
+ W[P0] = R0;
SSYNC;

- IDLE;
+ /* issue core reset */
+ raise 1;

RTS;
+ENDPROC(_bfin_reset)

.data

diff --git a/arch/blackfin/mach-bf561/head.S b/arch/blackfin/mach-bf561/head.S
index 462c39e..04f3ac3 100644
--- a/arch/blackfin/mach-bf561/head.S
+++ b/arch/blackfin/mach-bf561/head.S
@@ -427,68 +427,30 @@ ENTRY(_bfin_reset)
[p0] = r0;
SSYNC;

- /* Disable the WDOG TIMER */
- p0.h = hi(WDOGA_CTL);
- p0.l = lo(WDOGA_CTL);
- r0.l = 0xAD6;
- w[p0] = r0.l;
+ /* make sure SYSCR is set to use BMODE */
+ P0.h = hi(SICA_SYSCR);
+ P0.l = lo(SICA_SYSCR);
+ R0.l = 0x0;
+ W[P0] = R0.l;
SSYNC;

- /* Clear the sticky bit incase it is already set */
- p0.h = hi(WDOGA_CTL);
- p0.l = lo(WDOGA_CTL);
- r0.l = 0x8AD6;
- w[p0] = r0.l;
- SSYNC;
-
- /* Program the count value */
- R0.l = 0x100;
- R0.h = 0x0;
- P0.h = hi(WDOGA_CNT);
- P0.l = lo(WDOGA_CNT);
- [P0] = R0;
+ /* issue a system soft reset */
+ P1.h = hi(SICA_SWRST);
+ P1.l = lo(SICA_SWRST);
+ R1.l = 0x0007;
+ W[P1] = R1;
SSYNC;

- /* Program WDOG_STAT if necessary */
- P0.h = hi(WDOGA_CTL);
- P0.l = lo(WDOGA_CTL);
- R0 = W[P0](Z);
- CC = BITTST(R0,1);
- if !CC JUMP .LWRITESTAT;
- CC = BITTST(R0,2);
- if !CC JUMP .LWRITESTAT;
- JUMP .LSKIP_WRITE;
-
-.LWRITESTAT:
- /* When watch dog timer is enabled,
- * a write to STAT will load the contents of CNT to STAT
- */
- R0 = 0x0000(z);
- P0.h = hi(WDOGA_STAT);
- P0.l = lo(WDOGA_STAT)
- [P0] = R0;
- SSYNC;
-
-.LSKIP_WRITE:
- /* Enable the reset event */
- P0.h = hi(WDOGA_CTL);
- P0.l = lo(WDOGA_CTL);
- R0 = W[P0](Z);
- BITCLR(R0,1);
- BITCLR(R0,2);
- W[P0] = R0.L;
- SSYNC;
- NOP;
-
- /* Enable the wdog counter */
- R0 = W[P0](Z);
- BITCLR(R0,4);
- W[P0] = R0.L;
+ /* clear system soft reset */
+ R0.l = 0x0000;
+ W[P0] = R0;
SSYNC;

- IDLE;
+ /* issue core reset */
+ raise 1;

RTS;
+ENDPROC(_bfin_reset)

.data

--
1.5.1.2
-
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