diff options
Diffstat (limited to 'cpu/ppc4xx/start.S')
| -rw-r--r-- | cpu/ppc4xx/start.S | 248 |
1 files changed, 124 insertions, 124 deletions
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S index c6a9eda..aa857d0 100644 --- a/cpu/ppc4xx/start.S +++ b/cpu/ppc4xx/start.S @@ -556,9 +556,9 @@ _start: /*----------------------------------------------------------------------- */ /* DMA Status, clear to come up clean */ /*----------------------------------------------------------------------- */ - addis r3,r0, 0xFFFF /* Clear all existing DMA status */ - ori r3,r3, 0xFFFF - mtdcr dmasr, r3 + addis r3,r0, 0xFFFF /* Clear all existing DMA status */ + ori r3,r3, 0xFFFF + mtdcr dmasr, r3 bl ppc405ep_init /* do ppc405ep specific init */ #endif /* CONFIG_405EP */ @@ -568,21 +568,21 @@ _start: * Setup OCM - On Chip Memory *******************************************************************/ /* Setup OCM */ - lis r0, 0x7FFF - ori r0, r0, 0xFFFF - mfdcr r3, ocmiscntl /* get instr-side IRAM config */ - mfdcr r4, ocmdscntl /* get data-side IRAM config */ - and r3, r3, r0 /* disable data-side IRAM */ - and r4, r4, r0 /* disable data-side IRAM */ - mtdcr ocmiscntl, r3 /* set instr-side IRAM config */ - mtdcr ocmdscntl, r4 /* set data-side IRAM config */ - isync + lis r0, 0x7FFF + ori r0, r0, 0xFFFF + mfdcr r3, ocmiscntl /* get instr-side IRAM config */ + mfdcr r4, ocmdscntl /* get data-side IRAM config */ + and r3, r3, r0 /* disable data-side IRAM */ + and r4, r4, r0 /* disable data-side IRAM */ + mtdcr ocmiscntl, r3 /* set instr-side IRAM config */ + mtdcr ocmdscntl, r4 /* set data-side IRAM config */ + isync addis r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */ mtdcr ocmdsarc, r3 addis r4, 0, 0xC000 /* OCM data area enabled */ mtdcr ocmdscntl, r4 - isync + isync #endif /*----------------------------------------------------------------------- */ @@ -697,7 +697,7 @@ _start: GET_GOT /* initialize GOT access */ - bl cpu_init_f /* run low-level CPU init code (from Flash) */ + bl cpu_init_f /* run low-level CPU init code (from Flash) */ /* NEVER RETURNS! */ bl board_init_f /* run first part of init code (from Flash) */ @@ -1451,100 +1451,100 @@ trap_reloc: /**************************************************************************/ #ifdef CONFIG_405EP ppc405ep_init: - /* - !----------------------------------------------------------------------- - ! Check FPGA for PCI internal/external arbitration - ! If board is set to internal arbitration, update cpc0_pci - !----------------------------------------------------------------------- + /* + !----------------------------------------------------------------------- + ! Check FPGA for PCI internal/external arbitration + ! If board is set to internal arbitration, update cpc0_pci + !----------------------------------------------------------------------- */ - addi r3,0,CPC0_PCI_HOST_CFG_EN + addi r3,0,CPC0_PCI_HOST_CFG_EN #ifdef CONFIG_BUBINGA405EP - addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */ - ori r5,r5,FPGA_REG1@l - lbz r5,0x0(r5) /* read to get PCI arb selection */ - andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/ - beq ..pci_cfg_set /* if not set, then bypass reg write*/ + addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */ + ori r5,r5,FPGA_REG1@l + lbz r5,0x0(r5) /* read to get PCI arb selection */ + andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/ + beq ..pci_cfg_set /* if not set, then bypass reg write*/ #endif - ori r3,r3,CPC0_PCI_ARBIT_EN + ori r3,r3,CPC0_PCI_ARBIT_EN ..pci_cfg_set: - mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/ - - /* - !----------------------------------------------------------------------- - ! Check to see if chip is in bypass mode. - ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a - ! CPU reset Otherwise, skip this step and keep going. - ! Note: Running BIOS in bypass mode is not supported since PLB speed - ! will not be fast enough for the SDRAM (min 66MHz) - !----------------------------------------------------------------------- + mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/ + + /* + !----------------------------------------------------------------------- + ! Check to see if chip is in bypass mode. + ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a + ! CPU reset Otherwise, skip this step and keep going. + ! Note: Running BIOS in bypass mode is not supported since PLB speed + ! will not be fast enough for the SDRAM (min 66MHz) + !----------------------------------------------------------------------- */ - mfdcr r5, CPC0_PLLMR1 - rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */ - cmpi cr0,0,r4,0x1 + mfdcr r5, CPC0_PLLMR1 + rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */ + cmpi cr0,0,r4,0x1 - beq pll_done /* if SSCS =b'1' then PLL has */ - /* already been set */ - /* and CPU has been reset */ - /* so skip to next section */ + beq pll_done /* if SSCS =b'1' then PLL has */ + /* already been set */ + /* and CPU has been reset */ + /* so skip to next section */ #ifdef CONFIG_BUBINGA405EP /* - !----------------------------------------------------------------------- - ! Read NVRAM to get value to write in PLLMR. - ! If value has not been correctly saved, write default value - ! Default config values (assuming on-board 33MHz SYS_CLK) are above. - ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above. - ! - ! WARNING: This code assumes the first three words in the nvram_t - ! structure in openbios.h. Changing the beginning of - ! the structure will break this code. - ! - !----------------------------------------------------------------------- + !----------------------------------------------------------------------- + ! Read NVRAM to get value to write in PLLMR. + ! If value has not been correctly saved, write default value + ! Default config values (assuming on-board 33MHz SYS_CLK) are above. + ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above. + ! + ! WARNING: This code assumes the first three words in the nvram_t + ! structure in openbios.h. Changing the beginning of + ! the structure will break this code. + ! + !----------------------------------------------------------------------- */ - addis r3,0,NVRAM_BASE@h - addi r3,r3,NVRAM_BASE@l - - lwz r4, 0(r3) - addis r5,0,NVRVFY1@h - addi r5,r5,NVRVFY1@l - cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/ - bne ..no_pllset - addi r3,r3,4 - lwz r4, 0(r3) - addis r5,0,NVRVFY2@h - addi r5,r5,NVRVFY2@l - cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */ - bne ..no_pllset - addi r3,r3,8 /* Skip over conf_size */ - lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */ - lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */ - rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */ - cmpi cr0,0,r5,1 /* See if PLL is locked */ - beq pll_write + addis r3,0,NVRAM_BASE@h + addi r3,r3,NVRAM_BASE@l + + lwz r4, 0(r3) + addis r5,0,NVRVFY1@h + addi r5,r5,NVRVFY1@l + cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/ + bne ..no_pllset + addi r3,r3,4 + lwz r4, 0(r3) + addis r5,0,NVRVFY2@h + addi r5,r5,NVRVFY2@l + cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */ + bne ..no_pllset + addi r3,r3,8 /* Skip over conf_size */ + lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */ + lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */ + rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */ + cmpi cr0,0,r5,1 /* See if PLL is locked */ + beq pll_write ..no_pllset: #endif /* CONFIG_BUBINGA405EP */ - addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */ - ori r3,r3,PLLMR0_DEFAULT@l /* */ - addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */ - ori r4,r4,PLLMR1_DEFAULT@l /* */ + addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */ + ori r3,r3,PLLMR0_DEFAULT@l /* */ + addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */ + ori r4,r4,PLLMR1_DEFAULT@l /* */ - b pll_write /* Write the CPC0_PLLMR with new value */ + b pll_write /* Write the CPC0_PLLMR with new value */ pll_done: - /* - !----------------------------------------------------------------------- - ! Clear Soft Reset Register - ! This is needed to enable PCI if not booting from serial EPROM - !----------------------------------------------------------------------- + /* + !----------------------------------------------------------------------- + ! Clear Soft Reset Register + ! This is needed to enable PCI if not booting from serial EPROM + !----------------------------------------------------------------------- */ - addi r3, 0, 0x0 - mtdcr CPC0_SRR, r3 + addi r3, 0, 0x0 + mtdcr CPC0_SRR, r3 - addis r3,0,0x0010 - mtctr r3 + addis r3,0,0x0010 + mtctr r3 pci_wait: - bdnz pci_wait + bdnz pci_wait blr /* return to main code */ @@ -1565,43 +1565,43 @@ pci_wait: !----------------------------------------------------------------------------- */ pll_write: - mfdcr r5, CPC0_UCR - andis. r5,r5,0xFFFF - ori r5,r5,0x0101 /* Stop the UART clocks */ - mtdcr CPC0_UCR,r5 /* Before changing PLL */ - - mfdcr r5, CPC0_PLLMR1 - rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */ - mtdcr CPC0_PLLMR1,r5 - oris r5,r5,0x4000 /* Set PLL Reset */ - mtdcr CPC0_PLLMR1,r5 - - mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */ - rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */ - oris r5,r5,0x4000 /* Set PLL Reset */ - mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */ - rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */ - mtdcr CPC0_PLLMR1,r5 + mfdcr r5, CPC0_UCR + andis. r5,r5,0xFFFF + ori r5,r5,0x0101 /* Stop the UART clocks */ + mtdcr CPC0_UCR,r5 /* Before changing PLL */ + + mfdcr r5, CPC0_PLLMR1 + rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */ + mtdcr CPC0_PLLMR1,r5 + oris r5,r5,0x4000 /* Set PLL Reset */ + mtdcr CPC0_PLLMR1,r5 + + mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */ + rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */ + oris r5,r5,0x4000 /* Set PLL Reset */ + mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */ + rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */ + mtdcr CPC0_PLLMR1,r5 /* - ! Wait min of 100us for PLL to lock. - ! See CMOS 27E databook for more info. - ! At 200MHz, that means waiting 20,000 instructions + ! Wait min of 100us for PLL to lock. + ! See CMOS 27E databook for more info. + ! At 200MHz, that means waiting 20,000 instructions */ - addi r3,0,20000 /* 2000 = 0x4e20 */ - mtctr r3 + addi r3,0,20000 /* 2000 = 0x4e20 */ + mtctr r3 pll_wait: - bdnz pll_wait - - oris r5,r5,0x8000 /* Enable PLL */ - mtdcr CPC0_PLLMR1,r5 /* Engage */ - - /* - * Reset CPU to guarantee timings are OK - * Not sure if this is needed... - */ - addis r3,0,0x1000 - mtspr dbcr0,r3 /* This will cause a CPU core reset, and */ - /* execution will continue from the poweron */ - /* vector of 0xfffffffc */ + bdnz pll_wait + + oris r5,r5,0x8000 /* Enable PLL */ + mtdcr CPC0_PLLMR1,r5 /* Engage */ + + /* + * Reset CPU to guarantee timings are OK + * Not sure if this is needed... + */ + addis r3,0,0x1000 + mtspr dbcr0,r3 /* This will cause a CPU core reset, and */ + /* execution will continue from the poweron */ + /* vector of 0xfffffffc */ #endif /* CONFIG_405EP */ |