/* 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 MEM_1MS ((396000000/1000000) * 1000) .text .set noreorder .set mips32 .globl memsetup memsetup: /* * Step 1) Establish CPU endian mode. * NOTE: A fair amount of code is necessary on the Pb1000 to * obtain the value of Switch S8.1 which is used to determine * endian at run-time. */ /* RCE1 */ li t0, MEM_STCFG1 li t1, 0x00000083 sw t1, 0(t0) li t0, MEM_STTIME1 li t1, 0x33030A10 sw t1, 0(t0) li t0, MEM_STADDR1 li t1, 0x11803E40 sw t1, 0(t0) /* Set DSTRB bits so switch will read correctly */ li t1, 0xBE00000C lw t2, 0(t1) or t2, t2, 0x00000300 sw t2, 0(t1) /* Check switch setting */ li t1, 0xBE000014 lw t2, 0(t1) and t2, t2, 0x00000100 bne t2, zero, 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 /* First setup pll:s to make serial work ok */ /* We have a 12 MHz crystal */ li t0, SYS_CPUPLL li t1, 0x21 /* 396 MHz */ 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, 8 /* 96 MHz */ sw t1, 0(t0) /* aux pll */ sync /* Static memory controller */ /* RCE0 8MB AMD29D323 Flash */ li t0, MEM_STCFG0 li t1, 0x00001403 sw t1, 0(t0) li t0, MEM_STTIME0 li t1, 0xFFFFFFDD sw t1, 0(t0) li t0, MEM_STADDR0 li t1, 0x11F83FE0 sw t1, 0(t0) /* RCE1 CPLD Board Logic */ li t0, MEM_STCFG1 li t1, 0x00000083 sw t1, 0(t0) li t0, MEM_STTIME1 li t1, 0x33030A10 sw t1, 0(t0) li t0, MEM_STADDR1 li t1, 0x11803E40 sw t1, 0(t0) /* RCE2 CPLD Board Logic */ li t0, MEM_STCFG2 li t1, 0x00000004 sw t1, 0(t0) li t0, MEM_STTIME2 li t1, 0x08061908 sw t1, 0(t0) li t0, MEM_STADDR2 li t1, 0x12A03FC0 sw t1, 0(t0) /* 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 /* * Skip memory setup if we are running from memory */ li t0, 0x90000000 sub t0, ra, t0 bltz t0, skip_memsetup nop /* * SDCS0 - Not used, for SMROM * SDCS1 - 32MB Micron 48LCBM16A2 * SDCS2 - 32MB Micron 48LCBM16A2 */ li t0, MEM_SDMODE0 li t1, 0x00000000 sw t1, 0(t0) li t0, MEM_SDMODE1 li t1, 0x00552229 sw t1, 0(t0) li t0, MEM_SDMODE2 li t1, 0x00552229 sw t1, 0(t0) li t0, MEM_SDADDR0 li t1, 0x00000000 sw t1, 0(t0) li t0, MEM_SDADDR1 li t1, 0x001003F8 sw t1, 0(t0) li t0, MEM_SDADDR2 li t1, 0x001023F8 sw t1, 0(t0) sync li t0, MEM_SDREFCFG li t1, 0x74000c30 /* 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, 0x76000c30 /* Enable */ sw t1, 0(t0) sync li t0, MEM_SDWRMD0 li t1, 0x00000023 sw t1, 0(t0) sync li t0, MEM_SDWRMD1 li t1, 0x00000023 sw t1, 0(t0) sync li t0, MEM_SDWRMD2 li t1, 0x00000023 sw t1, 0(t0) sync /* wait 1mS after setup */ li t1, MEM_1MS 1: add t1, -1 bne t1, zero, 1b nop skip_memsetup: li t0, SYS_PINFUNC li t1, 0/*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