diff options
Diffstat (limited to 'arch/blackfin/mach-bf561/head.S')
| -rw-r--r-- | arch/blackfin/mach-bf561/head.S | 79 |
1 files changed, 18 insertions, 61 deletions
diff --git a/arch/blackfin/mach-bf561/head.S b/arch/blackfin/mach-bf561/head.S index 7bca478526b9..ad9187a866a5 100644 --- a/arch/blackfin/mach-bf561/head.S +++ b/arch/blackfin/mach-bf561/head.S @@ -127,7 +127,8 @@ ENTRY(__stext) STI R2; #endif - /* Initialise UART*/ + /* Initialise UART - when booting from u-boot, the UART is not disabled + * so if we dont initalize here, our serial console gets hosed */ p0.h = hi(UART_LCR); p0.l = lo(UART_LCR); r0 = 0x0(Z); @@ -414,12 +415,6 @@ ENTRY(_bfin_reset) w[p0] = r0.l; #endif - /* Clear the bits 13-15 in SWRST if they werent cleared */ - p0.h = hi(SICA_SWRST); - p0.l = lo(SICA_SWRST); - csync; - r0.l = w[p0]; - /* Clear the IMASK register */ p0.h = hi(IMASK); p0.l = lo(IMASK); @@ -433,68 +428,30 @@ 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; - 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; + /* make sure SYSCR is set to use BMODE */ + P0.h = hi(SICA_SYSCR); + P0.l = lo(SICA_SYSCR); + R0.l = 0x20; + 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 |