tools/updater/utils.c

   1 #include <common.h>
   2 #include <asm/processor.h>
   3 #include <memio.h>
   4 #include <linux/ctype.h>
   5
   6 static __inline__ unsigned long
   7 get_msr(void)
   8 {
   9         unsigned long msr;
  10
  11         asm volatile("mfmsr %0" : "=r" (msr) :);
  12         return msr;
  13 }
  14
  15 static __inline__ void
  16 set_msr(unsigned long msr)
  17 {
  18         asm volatile("mtmsr %0" : : "r" (msr));
  19 }
  20
  21 static __inline__ unsigned long
  22 get_dec(void)
  23 {
  24         unsigned long val;
  25
  26         asm volatile("mfdec %0" : "=r" (val) :);
  27         return val;
  28 }
  29
  30
  31 static __inline__ void
  32 set_dec(unsigned long val)
  33 {
  34         asm volatile("mtdec %0" : : "r" (val));
  35 }
  36
  37
  38 void
  39 enable_interrupts(void)
  40 {
  41     set_msr (get_msr() | MSR_EE);
  42 }
  43
  44 /* returns flag if MSR_EE was set before */
  45 int
  46 disable_interrupts(void)
  47 {
  48     ulong msr;
  49
  50     msr = get_msr();
  51     set_msr (msr & ~MSR_EE);
  52     return ((msr & MSR_EE) != 0);
  53 }
  54
  55 u8 in8(u32 port)
  56 {
  57     return in_byte(port);
  58 }
  59
  60 void out8(u32 port, u8 val)
  61 {
  62     out_byte(port, val);
  63 }
  64
  65 unsigned long in32(u32 port)
  66 {
  67     return in_long(port);
  68 }
  69
  70 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
  71 {
  72         unsigned long result = 0,value;
  73
  74         if (*cp == '0') {
  75                 cp++;
  76                 if ((*cp == 'x') && isxdigit(cp[1])) {
  77                         base = 16;
  78                         cp++;
  79                 }
  80                 if (!base) {
  81                         base = 8;
  82                 }
  83         }
  84         if (!base) {
  85                 base = 10;
  86         }
  87         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  88             ? toupper(*cp) : *cp)-'A'+10) < base) {
  89                 result = result*base + value;
  90                 cp++;
  91         }
  92         if (endp)
  93                 *endp = (char *)cp;
  94         return result;
  95 }
  96
  97 long simple_strtol(const char *cp,char **endp,unsigned int base)
  98 {
  99         if(*cp=='-')
 100                 return -simple_strtoul(cp+1,endp,base);
 101         return simple_strtoul(cp,endp,base);
 102 }
 103
 104 static inline void
 105 soft_restart(unsigned long addr)
 106 {
 107         /* SRR0 has system reset vector, SRR1 has default MSR value */
 108         /* rfi restores MSR from SRR1 and sets the PC to the SRR0 value */
 109
 110         __asm__ __volatile__ ("mtspr    26, %0"         :: "r" (addr));
 111         __asm__ __volatile__ ("li       4, (1 << 6)"    ::: "r4");
 112         __asm__ __volatile__ ("mtspr    27, 4");
 113         __asm__ __volatile__ ("rfi");
 114
 115         while(1);       /* not reached */
 116 }
 117
 118 void
 119 do_reset (void)
 120 {
 121         ulong addr;
 122         /* flush and disable I/D cache */
 123         __asm__ __volatile__ ("mfspr    3, 1008"        ::: "r3");
 124         __asm__ __volatile__ ("ori      5, 5, 0xcc00"   ::: "r5");
 125         __asm__ __volatile__ ("ori      4, 3, 0xc00"    ::: "r4");
 126         __asm__ __volatile__ ("andc     5, 3, 5"        ::: "r5");
 127         __asm__ __volatile__ ("sync");
 128         __asm__ __volatile__ ("mtspr    1008, 4");
 129         __asm__ __volatile__ ("isync");
 130         __asm__ __volatile__ ("sync");
 131         __asm__ __volatile__ ("mtspr    1008, 5");
 132         __asm__ __volatile__ ("isync");
 133         __asm__ __volatile__ ("sync");
 134
 135 #ifdef CONFIG_SYS_RESET_ADDRESS
 136         addr = CONFIG_SYS_RESET_ADDRESS;
 137 #else
 138         /*
 139          * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address,
 140          * CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid
 141          * address. Better pick an address known to be invalid on your
 142          * system and assign it to CONFIG_SYS_RESET_ADDRESS.
 143          */
 144         addr = CONFIG_SYS_MONITOR_BASE - sizeof (ulong);
 145 #endif
 146         soft_restart(addr);
 147         while(1);       /* not reached */
 148 }