LXR uboot/tools/updater/utils.c

   1#include <common.h>
   2#include <asm/processor.h>
   3#include <memio.h>
   4#include <linux/ctype.h>
   5
   6static __inline__ unsigned long
   7get_msr(void)
   8{
   9        unsigned long msr;
  10
  11        asm volatile("mfmsr %0" : "=r" (msr) :);
  12        return msr;
  13}
  14
  15static __inline__ void
  16set_msr(unsigned long msr)
  17{
  18        asm volatile("mtmsr %0" : : "r" (msr));
  19}
  20
  21static __inline__ unsigned long
  22get_dec(void)
  23{
  24        unsigned long val;
  25
  26        asm volatile("mfdec %0" : "=r" (val) :);
  27        return val;
  28}
  29
  30
  31static __inline__ void
  32set_dec(unsigned long val)
  33{
  34        asm volatile("mtdec %0" : : "r" (val));
  35}
  36
  37
  38void
  39enable_interrupts(void)
  40{
  41    set_msr (get_msr() | MSR_EE);
  42}
  43
  44/* returns flag if MSR_EE was set before */
  45int
  46disable_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
  55u8 in8(u32 port)
  56{
  57    return in_byte(port);
  58}
  59
  60void out8(u32 port, u8 val)
  61{
  62    out_byte(port, val);
  63}
  64
  65unsigned long in32(u32 port)
  66{
  67    return in_long(port);
  68}
  69
  70unsigned 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
  97long 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
 104static inline void
 105soft_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
 118void
 119do_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}
 149