| /* Memory sub-system initialization code */ |
| |
| #include <config.h> |
| #include <version.h> |
| #include <asm/regdef.h> |
| #include <asm/au1x00.h> |
| #include <asm/mipsregs.h> |
| |
| #define AU1500_SYS_ADDR 0xB1900000 |
| #define sys_endian 0x0038 |
| #define CP0_Config0 $16 |
| #define CPU_SCALE ((CFG_MHZ) / 12) /* CPU clock is a multiple of 12 MHz */ |
| #define MEM_1MS ((CFG_MHZ) * 1000) |
| |
| .text |
| .set noreorder |
| .set mips32 |
| |
| .globl lowlevel_init |
| lowlevel_init: |
| /* |
| * Step 1) Establish CPU endian mode. |
| * Db1500-specific: |
| * Switch S1.1 Off(bit7 reads 1) is Little Endian |
| * Switch S1.1 On (bit7 reads 0) is Big Endian |
| */ |
| #ifdef CONFIG_DBAU1550 |
| li t0, MEM_STCFG2 |
| li t1, 0x00000040 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME2 |
| li t1, 0x22080a20 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR2 |
| li t1, 0x10c03f00 |
| sw t1, 0(t0) |
| #else |
| li t0, MEM_STCFG1 |
| li t1, 0x00000080 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME1 |
| li t1, 0x22080a20 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR1 |
| li t1, 0x10c03f00 |
| sw t1, 0(t0) |
| #endif |
| |
| li t0, DB1XX0_BCSR_ADDR |
| lw t1,8(t0) |
| andi t1,t1,0x80 |
| beq zero,t1,big_endian |
| nop |
| little_endian: |
| |
| /* Change Au1 core to little endian */ |
| li t0, AU1500_SYS_ADDR |
| li t1, 1 |
| sw t1, sys_endian(t0) |
| mfc0 t2, CP0_CONFIG |
| mtc0 t2, CP0_CONFIG |
| nop |
| nop |
| |
| /* Big Endian is default so nothing to do but fall through */ |
| |
| big_endian: |
| |
| /* |
| * Step 2) Establish Status Register |
| * (set BEV, clear ERL, clear EXL, clear IE) |
| */ |
| li t1, 0x00400000 |
| mtc0 t1, CP0_STATUS |
| |
| /* |
| * Step 3) Establish CP0 Config0 |
| * (set OD, set K0=3) |
| */ |
| li t1, 0x00080003 |
| mtc0 t1, CP0_CONFIG |
| |
| /* |
| * Step 4) Disable Watchpoint facilities |
| */ |
| li t1, 0x00000000 |
| mtc0 t1, CP0_WATCHLO |
| mtc0 t1, CP0_IWATCHLO |
| /* |
| * Step 5) Disable the performance counters |
| */ |
| mtc0 zero, CP0_PERFORMANCE |
| nop |
| |
| /* |
| * Step 6) Establish EJTAG Debug register |
| */ |
| mtc0 zero, CP0_DEBUG |
| nop |
| |
| /* |
| * Step 7) Establish Cause |
| * (set IV bit) |
| */ |
| li t1, 0x00800000 |
| mtc0 t1, CP0_CAUSE |
| |
| /* Establish Wired (and Random) */ |
| mtc0 zero, CP0_WIRED |
| nop |
| |
| #ifdef CONFIG_DBAU1550 |
| /* No workaround if running from ram */ |
| lui t0, 0xffc0 |
| lui t3, 0xbfc0 |
| and t1, ra, t0 |
| bne t1, t3, noCacheJump |
| nop |
| |
| /*** From AMD YAMON ***/ |
| /* |
| * Step 8) Initialize the caches |
| */ |
| li t0, (16*1024) |
| li t1, 32 |
| li t2, 0x80000000 |
| addu t3, t0, t2 |
| cacheloop: |
| cache 0, 0(t2) |
| cache 1, 0(t2) |
| addu t2, t1 |
| bne t2, t3, cacheloop |
| nop |
| |
| /* Save return address */ |
| move t3, ra |
| |
| /* Run from cacheable space now */ |
| bal cachehere |
| nop |
| cachehere: |
| li t1, ~0x20000000 /* convert to KSEG0 */ |
| and t0, ra, t1 |
| addi t0, 5*4 /* 5 insns beyond cachehere */ |
| jr t0 |
| nop |
| |
| /* Restore return address */ |
| move ra, t3 |
| |
| /* |
| * Step 9) Initialize the TLB |
| */ |
| li t0, 0 # index value |
| li t1, 0x00000000 # entryhi value |
| li t2, 32 # 32 entries |
| |
| tlbloop: |
| /* Probe TLB for matching EntryHi */ |
| mtc0 t1, CP0_ENTRYHI |
| tlbp |
| nop |
| |
| /* Examine Index[P], 1=no matching entry */ |
| mfc0 t3, CP0_INDEX |
| li t4, 0x80000000 |
| and t3, t4, t3 |
| addiu t1, t1, 1 # increment t1 (asid) |
| beq zero, t3, tlbloop |
| nop |
| |
| /* Initialize the TLB entry */ |
| mtc0 t0, CP0_INDEX |
| mtc0 zero, CP0_ENTRYLO0 |
| mtc0 zero, CP0_ENTRYLO1 |
| mtc0 zero, CP0_PAGEMASK |
| tlbwi |
| |
| /* Do it again */ |
| addiu t0, t0, 1 |
| bne t0, t2, tlbloop |
| nop |
| |
| #endif /* CONFIG_DBAU1550 */ |
| |
| /* First setup pll:s to make serial work ok */ |
| /* We have a 12 MHz crystal */ |
| li t0, SYS_CPUPLL |
| li t1, CPU_SCALE /* CPU clock */ |
| sw t1, 0(t0) |
| sync |
| nop |
| nop |
| |
| /* wait 1mS for clocks to settle */ |
| li t1, MEM_1MS |
| 1: add t1, -1 |
| bne t1, zero, 1b |
| nop |
| /* Setup AUX PLL */ |
| li t0, SYS_AUXPLL |
| li t1, 0x20 /* 96 MHz */ |
| sw t1, 0(t0) /* aux pll */ |
| sync |
| |
| #ifdef CONFIG_DBAU1550 |
| /* Static memory controller */ |
| /* RCE0 - can not change while fetching, do so from icache */ |
| move t2, ra /* Store return address */ |
| bal getAddr |
| nop |
| |
| getAddr: |
| move t1, ra |
| move ra, t2 /* Move return addess back */ |
| |
| cache 0x14,0(t1) |
| cache 0x14,32(t1) |
| /*** /From YAMON ***/ |
| |
| noCacheJump: |
| #endif /* CONFIG_DBAU1550 */ |
| |
| #ifdef CONFIG_DBAU1550 |
| li t0, MEM_STTIME0 |
| li t1, 0x040181D7 |
| sw t1, 0(t0) |
| |
| /* RCE0 AMD MirrorBit Flash (?) */ |
| li t0, MEM_STCFG0 |
| li t1, 0x00000003 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR0 |
| li t1, 0x11803E00 |
| sw t1, 0(t0) |
| #else /* CONFIG_DBAU1550 */ |
| li t0, MEM_STTIME0 |
| li t1, 0x040181D7 |
| sw t1, 0(t0) |
| |
| /* RCE0 AMD 29LV640M MirrorBit Flash */ |
| li t0, MEM_STCFG0 |
| li t1, 0x00000013 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR0 |
| li t1, 0x11E03F80 |
| sw t1, 0(t0) |
| #endif /* CONFIG_DBAU1550 */ |
| |
| /* RCE1 CPLD Board Logic */ |
| li t0, MEM_STCFG1 |
| li t1, 0x00000080 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME1 |
| li t1, 0x22080a20 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR1 |
| li t1, 0x10c03f00 |
| sw t1, 0(t0) |
| |
| #ifdef CONFIG_DBAU1550 |
| /* RCE2 CPLD Board Logic */ |
| li t0, MEM_STCFG2 |
| li t1, 0x00000040 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME2 |
| li t1, 0x22080a20 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR2 |
| li t1, 0x10c03f00 |
| sw t1, 0(t0) |
| #else |
| li t0, MEM_STCFG2 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME2 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR2 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| #endif |
| |
| /* RCE3 PCMCIA 250ns */ |
| li t0, MEM_STCFG3 |
| li t1, 0x00000002 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STTIME3 |
| li t1, 0x280E3E07 |
| sw t1, 0(t0) |
| |
| li t0, MEM_STADDR3 |
| li t1, 0x10000000 |
| sw t1, 0(t0) |
| |
| sync |
| |
| /* Set peripherals to a known state */ |
| li t0, IC0_CFG0CLR |
| li t1, 0xFFFFFFFF |
| sw t1, 0(t0) |
| |
| li t0, IC0_CFG0CLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_CFG1CLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_CFG2CLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_SRCSET |
| sw t1, 0(t0) |
| |
| li t0, IC0_ASSIGNSET |
| sw t1, 0(t0) |
| |
| li t0, IC0_WAKECLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_RISINGCLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_FALLINGCLR |
| sw t1, 0(t0) |
| |
| li t0, IC0_TESTBIT |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, IC1_CFG0CLR |
| li t1, 0xFFFFFFFF |
| sw t1, 0(t0) |
| |
| li t0, IC1_CFG0CLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_CFG1CLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_CFG2CLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_SRCSET |
| sw t1, 0(t0) |
| |
| li t0, IC1_ASSIGNSET |
| sw t1, 0(t0) |
| |
| li t0, IC1_WAKECLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_RISINGCLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_FALLINGCLR |
| sw t1, 0(t0) |
| |
| li t0, IC1_TESTBIT |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, SYS_FREQCTRL0 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, SYS_FREQCTRL1 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, SYS_CLKSRC |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, SYS_PININPUTEN |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, 0xB1100100 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, 0xB1400100 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| |
| li t0, SYS_WAKEMSK |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, SYS_WAKESRC |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| /* wait 1mS before setup */ |
| li t1, MEM_1MS |
| 1: add t1, -1 |
| bne t1, zero, 1b |
| nop |
| |
| #ifdef CONFIG_DBAU1550 |
| /* SDCS 0,1,2 DDR SDRAM */ |
| li t0, MEM_SDMODE0 |
| li t1, 0x04276221 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDMODE1 |
| li t1, 0x04276221 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDMODE2 |
| li t1, 0x04276221 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDADDR0 |
| li t1, 0xe21003f0 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDADDR1 |
| li t1, 0xe21043f0 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDADDR2 |
| li t1, 0xe21083f0 |
| sw t1, 0(t0) |
| |
| sync |
| |
| li t0, MEM_SDCONFIGA |
| li t1, 0x9030060a /* Program refresh - disabled */ |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDCONFIGB |
| li t1, 0x00028000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDPRECMD /* Precharge all */ |
| li t1, 0 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD0 |
| li t1, 0x40000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD1 |
| li t1, 0x40000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD2 |
| li t1, 0x40000000 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD0 |
| li t1, 0x00000063 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD1 |
| li t1, 0x00000063 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD2 |
| li t1, 0x00000063 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDPRECMD /* Precharge all */ |
| sw zero, 0(t0) |
| sync |
| |
| /* Issue 2 autoref */ |
| li t0, MEM_SDAUTOREF |
| sw zero, 0(t0) |
| sync |
| |
| li t0, MEM_SDAUTOREF |
| sw zero, 0(t0) |
| sync |
| |
| /* Enable refresh */ |
| li t0, MEM_SDCONFIGA |
| li t1, 0x9830060a /* Program refresh - enabled */ |
| sw t1, 0(t0) |
| sync |
| |
| #else /* CONFIG_DBAU1550 */ |
| /* SDCS 0,1 SDRAM */ |
| li t0, MEM_SDMODE0 |
| li t1, 0x005522AA |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDMODE1 |
| li t1, 0x005522AA |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDMODE2 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDADDR0 |
| li t1, 0x001003F8 |
| sw t1, 0(t0) |
| |
| |
| li t0, MEM_SDADDR1 |
| li t1, 0x001023F8 |
| sw t1, 0(t0) |
| |
| li t0, MEM_SDADDR2 |
| li t1, 0x00000000 |
| sw t1, 0(t0) |
| |
| sync |
| |
| li t0, MEM_SDREFCFG |
| li t1, 0x64000C24 /* Disable */ |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDPRECMD |
| sw zero, 0(t0) |
| sync |
| |
| li t0, MEM_SDAUTOREF |
| sw zero, 0(t0) |
| sync |
| sw zero, 0(t0) |
| sync |
| |
| li t0, MEM_SDREFCFG |
| li t1, 0x66000C24 /* Enable */ |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD0 |
| li t1, 0x00000033 |
| sw t1, 0(t0) |
| sync |
| |
| li t0, MEM_SDWRMD1 |
| li t1, 0x00000033 |
| sw t1, 0(t0) |
| sync |
| |
| #endif /* CONFIG_DBAU1550 */ |
| /* wait 1mS after setup */ |
| li t1, MEM_1MS |
| 1: add t1, -1 |
| bne t1, zero, 1b |
| nop |
| |
| li t0, SYS_PINFUNC |
| li t1, 0x00008080 |
| sw t1, 0(t0) |
| |
| li t0, SYS_TRIOUTCLR |
| li t1, 0x00001FFF |
| sw t1, 0(t0) |
| |
| li t0, SYS_OUTPUTCLR |
| li t1, 0x00008000 |
| sw t1, 0(t0) |
| sync |
| |
| j ra |
| nop |
