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Date: Mon, 21 May 2007 18:09:26 +0800 From: Bryan Wu <bryan.wu@...log.com> To: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org Cc: Mike Frysinger <michael.frysinger@...log.com>, Bryan Wu <bryan.wu@...log.com> Subject: [PATCH 18/32] Blackfin arch: issue reset via SWRST so we dont clobber the watchdog state From: Mike Frysinger <michael.frysinger@...log.com> Signed-off-by: Mike Frysinger <michael.frysinger@...log.com> Signed-off-by: Bryan Wu <bryan.wu@...log.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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