ref: 15d1425b276495a82621a8d075176a59a512cdf3
dir: /sys/src/9/bcm/archbcm.c/
/* * bcm2835 (e.g. original raspberry pi) architecture-specific stuff */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include "io.h" #include "arm.h" #define POWERREGS (VIRTIO+0x100000) Soc soc = { .dramsize = 512*MiB, .busdram = 0x40000000, .iosize = 16*MiB, .virtio = VIRTIO, .physio = 0x20000000, .busio = 0x7E000000, .armlocal = 0, .l1ptedramattrs = Cached | Buffered, .l2ptedramattrs = Cached | Buffered, }; enum { Wdogfreq = 65536, Wdogtime = 10, /* seconds, ≤ 15 */ }; /* * Power management / watchdog registers */ enum { Rstc = 0x1c>>2, Password = 0x5A<<24, CfgMask = 0x03<<4, CfgReset = 0x02<<4, Rsts = 0x20>>2, Wdog = 0x24>>2, }; void archreset(void) { fpon(); } void archreboot(void) { u32int *r; r = (u32int*)POWERREGS; r[Wdog] = Password | 1; r[Rstc] = Password | (r[Rstc] & ~CfgMask) | CfgReset; coherence(); for(;;) ; } void wdogfeed(void) { u32int *r; r = (u32int*)POWERREGS; r[Wdog] = Password | (Wdogtime * Wdogfreq); r[Rstc] = Password | (r[Rstc] & ~CfgMask) | CfgReset; } void wdogoff(void) { u32int *r; r = (u32int*)POWERREGS; r[Rstc] = Password | (r[Rstc] & ~CfgMask); } char * cputype2name(char *buf, int size) { seprint(buf, buf + size, "1176JZF-S"); return buf; } void cpuidprint(void) { char name[64]; cputype2name(name, sizeof name); delay(50); /* let uart catch up */ print("cpu%d: %dMHz ARM %s\n", m->machno, m->cpumhz, name); } int getncpus(void) { return 1; } int startcpus(uint) { return 1; } void archbcmlink(void) { addclock0link(wdogfeed, HZ); } int cmpswap(long *addr, long old, long new) { return cas32(addr, old, new); }