ref: da7d6df6faf18e289fe0f3f61524dcc7fddeef18
dir: /os/boot/mpc/initpaq.c/
/*
* Called from l.s in EPROM to set up a minimal working environment.
* Since there is no DRAM yet, and therefore no stack, no function
* calls may be made from sysinit0, and values can't be stored,
* except to INTMEM. Global values are accessed by offset from SB,
* which has been set by l.s to point into EPROM.
*
* This is PowerPAQ-specific:
* - assumes 8mbytes
* - powerpaq CS assignment
*/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "archpaq.h"
#define MB (1024*1024)
enum {
DRAMSIZE = 8*MB,
FLASHSIZE = 8*MB,
UPMSIZE = 64, /* memory controller instruction RAM */
SPEED = 50, /* maximum memory clock in MHz */
/* mcr */
WriteRAM = 0<<30,
ReadRAM = 1<<30,
ExecRAM = 2<<30,
SelUPMA = 0<<23,
SelUPMB = 1<<23,
Once = 1<<8,
};
/*
* mpc8bug uses the following for 60ns EDO DRAMs 32-50MHz
*/
static ulong upmb50[UPMSIZE] = {
0x8FFFEC24, 0xFFFEC04, 0xCFFEC04, 0xFFEC04,
0xFFEC00, 0x37FFEC47, 0xFFFFFFFF, 0xFFFFFFFF,
0x8FFFEC24, 0xFFFEC04, 0x8FFEC04, 0xFFEC0C,
0x3FFEC00, 0xFFEC44, 0xFFCC08, 0xCFFCC44,
0xFFEC0C, 0x3FFEC00, 0xFFEC44, 0xFFCC00,
0x3FFFC847, 0x3FFFEC47, 0xFFFFFFFF, 0xFFFFFFFF,
0x8FAFCC24, 0xFAFCC04, 0xCAFCC00, 0x11BFCC47,
0xC0FFCC84, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x8FAFCC24, 0xFAFCC04, 0xCAFCC00, 0x3AFCC4C,
0xCAFCC00, 0x3AFCC4C, 0xCAFCC00, 0x3AFCC4C,
0xCAFCC00, 0x33BFCC4F, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xC0FFCC84, 0xFFCC04, 0x7FFCC04, 0x3FFFCC06,
0xFFFFCC85, 0xFFFFCC05, 0xFFFFCC05, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x33FFCC07, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
};
void
sysinit0(int inrom)
{
ulong *upm;
IMM *io;
int i;
io = (IMM*)INTMEM; /* running before maps, no KADDR */
/* system interface unit initialisation, FADS manual table 3-2, except as noted */
io->siumcr = 0x01012440;
io->sypcr = 0xFFFFFF88;
io->tbscrk = KEEP_ALIVE_KEY;
io->tbscr = 0xC3; /* time base enabled */
io->rtcsck = KEEP_ALIVE_KEY;
io->rtcsc = 0xC1; /* don't FRZ, real-time clock enabled */
io->rtcsck = ~KEEP_ALIVE_KEY;
io->piscrk = KEEP_ALIVE_KEY;
io->piscr = 0x82;
io->memc[BOOTCS].base = FLASHMEM | 1;
io->memc[BOOTCS].option = ~(FLASHSIZE-1)|(1<<8)|(2<<4); /* mask, BIH, 2 wait states */
if(!inrom)
return; /* can't initialise DRAM controller from DRAM */
/* could check DRAM speed here; assume 60ns */
/* could probe DRAM for size here; assume DRAMSIZE */
io->mptpr = 0x400; /* powerpaq flash has 0x1000 */
io->mbmr = (0xC0<<24) | 0xA21114; /* 50MHz BRGCLK */
upm = upmb50;
for(i=0; i<UPMSIZE; i++){
io->mdr = upm[i];
io->mcr = WriteRAM | SelUPMB | i;
}
io->memc[DRAM1].option = ~(DRAMSIZE-1)|0x0800; /* address mask, SAM=1 */
io->memc[DRAM1].base = 0 | 0xC1; /* base at 0, 32-bit port size, no parity, UPMB */
}