int arch_halt_cpu(u32 cpu)
{
u32 timeout, val;
/* Enable Halt Debug and Instruction Transfer */
val = readl(DBG_DSCR(cpu));
val |= (0x1 << 14) | (0x1 << 13);
writel(val, DBG_DSCR(cpu));
/* Halt the dest cpu */
writel(0x1, DBG_DRCR(cpu));
/* Wait the cpu halted */
timeout = 10000;
do {
val = readl(DBG_DSCR(cpu));
if (val & 0x1)
break;
} while (--timeout);
if (!timeout)
return -1;
return 0;
}
void arch_restart_cpu(u32 cpu)
{
u32 timeout, val;
val = readl(DBG_DSCR(cpu));
val &= ~((0x1 << 14) | (0x1 << 13));
writel(val, DBG_DSCR(cpu));
/* Restart dest cpu */
writel(0x2, DBG_DRCR(cpu));
timeout = 10000;
do {
val = readl(DBG_DSCR(cpu));
if (val & (0x1 << 1))
break;
} while (--timeout);
if (!timeout)
pr_emerg("Cannot restart cpu%d\n", cpu);
}
void coresight_panic_locked_cpu(int cpu) {
unsigned int val, timeout = 10000;
u32 regval;
int i;
printk("Will change PC of cpu%d to 0 to trigger panic\n", cpu);
/* Enable trace/debug clock */
regval = readl(APMU_TRACE);
regval |= ((1 << 3) | (1 << 4) | (1 << 16));
writel(regval, APMU_TRACE);
printk("Please take below PCSR values as reference\n");
for (i = 0; i < 8; i++) {
val = readl(DBG_PCSR(cpu));
printk(KERN_EMERG "PCSR of cpu %d is 0x%x\n", cpu, val);
udelay(10);
}
/* Unlock debug register access */
writel(0xC5ACCE55, DBG_LAR(cpu));
/* Enable Halt Debug and Instruction Transfer */
val = readl(DBG_DSCR(cpu));
val |= (0x1 << 14) | (0x1 << 13);
writel(val, DBG_DSCR(cpu));
/* Halt the dest cpu */
writel(0x1, DBG_DRCR(cpu));
/* Wait the cpu halted */
do {
val = readl(DBG_DSCR(cpu));
if (val & 0x1)
break;
} while (timeout--);
if (!timeout) {
printk(KERN_EMERG "Cannot stop cpu%d\n", cpu);
return;
}
/* Issue an instruction to change the PC of dest cpu to 0 */
writel(0xE3A0F000, DBG_ITR(cpu));
/* Wait until the instruction complete */
timeout = 10000;
do {
val = readl(DBG_DSCR(cpu));
if (val & (0x1 << 24))
break;
} while (timeout--);
if (!timeout)
printk(KERN_EMERG "Cannot execute instructions on cpu%d\n", cpu);
val = readl(DBG_DSCR(cpu));
val &= ~((0x1 << 14) | (0x1 << 13));
writel(val, DBG_DSCR(cpu));
/* Restart dest cpu */
printk(KERN_EMERG "Going to restart cpu%d\n", cpu);
writel(0x2, DBG_DRCR(cpu));
timeout = 10000;
do {
val = readl(DBG_DSCR(cpu));
if (val & (0x1 << 1))
break;
} while (timeout--);
if (!timeout)
printk(KERN_EMERG "Cannot restart cpu%d\n", cpu);
}