sys/src/9/bcm/archbcm.c

   1 /*
   2  * bcm2835 (e.g. original raspberry pi) architecture-specific stuff
   3  */
   4
   5 #include "u.h"
   6 #include "../port/lib.h"
   7 #include "mem.h"
   8 #include "dat.h"
   9 #include "fns.h"
  10 #include "../port/error.h"
  11 #include "io.h"
  12 #include "arm.h"
  13
  14 #define POWERREGS       (VIRTIO+0x100000)
  15
  16 Soc soc = {
  17         .dramsize       = 512*MiB,
  18         .busdram        = 0x40000000,
  19         .iosize         = 16*MiB,
  20         .virtio         = VIRTIO,
  21         .physio         = 0x20000000,
  22         .busio          = 0x7E000000,
  23         .armlocal       = 0,
  24         .l1ptedramattrs = Cached | Buffered,
  25         .l2ptedramattrs = Cached | Buffered,
  26 };
  27
  28 enum {
  29         Wdogfreq        = 65536,
  30         Wdogtime        = 10,   /* seconds, ≤ 15 */
  31 };
  32
  33 /*
  34  * Power management / watchdog registers
  35  */
  36 enum {
  37         Rstc            = 0x1c>>2,
  38                 Password        = 0x5A<<24,
  39                 CfgMask         = 0x03<<4,
  40                 CfgReset        = 0x02<<4,
  41         Rsts            = 0x20>>2,
  42         Wdog            = 0x24>>2,
  43 };
  44
  45 void
  46 archreset(void)
  47 {
  48         fpon();
  49 }
  50
  51 void
  52 archreboot(void)
  53 {
  54         u32int *r;
  55
  56         r = (u32int*)POWERREGS;
  57         r[Wdog] = Password | 1;
  58         r[Rstc] = Password | (r[Rstc] & ~CfgMask) | CfgReset;
  59         coherence();
  60         for(;;)
  61                 ;
  62 }
  63
  64 void
  65 wdogfeed(void)
  66 {
  67         u32int *r;
  68
  69         r = (u32int*)POWERREGS;
  70         r[Wdog] = Password | (Wdogtime * Wdogfreq);
  71         r[Rstc] = Password | (r[Rstc] & ~CfgMask) | CfgReset;
  72 }
  73
  74 void
  75 wdogoff(void)
  76 {
  77         u32int *r;
  78
  79         r = (u32int*)POWERREGS;
  80         r[Rstc] = Password | (r[Rstc] & ~CfgMask);
  81 }
  82
  83 char *
  84 cputype2name(char *buf, int size)
  85 {
  86         seprint(buf, buf + size, "1176JZF-S");
  87         return buf;
  88 }
  89
  90 void
  91 cpuidprint(void)
  92 {
  93         char name[64];
  94
  95         cputype2name(name, sizeof name);
  96         delay(50);                              /* let uart catch up */
  97         print("cpu%d: %dMHz ARM %s\n", m->machno, m->cpumhz, name);
  98 }
  99
 100 int
 101 getncpus(void)
 102 {
 103         return 1;
 104 }
 105
 106 int
 107 startcpus(uint)
 108 {
 109         return 1;
 110 }
 111
 112 void
 113 archbcmlink(void)
 114 {
 115         addclock0link(wdogfeed, HZ);
 116 }
 117
 118 int
 119 l2ap(int ap)
 120 {
 121         return (AP(3, (ap))|AP(2, (ap))|AP(1, (ap))|AP(0, (ap)));
 122 }
 123
 124 int
 125 cmpswap(long *addr, long old, long new)
 126 {
 127         return cas32(addr, old, new);
 128 }
 129