Messages in this thread | | | From | Hiroshi Doyu <> | Date | Thu, 20 Dec 2012 12:21:36 +0100 | Subject | Re: [PATCH 3/9] ARM: tegra: # of CPU cores detection w/ & w/o HAVE_ARM_SCU |
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Felipe Balbi <balbi@ti.com> wrote @ Thu, 20 Dec 2012 11:06:25 +0100: ... > > @@ -149,7 +154,26 @@ done: > > */ > > static void __init tegra_smp_init_cpus(void) > > { > > - unsigned int i, ncores = scu_get_core_count(scu_base); > > + unsigned int i, cpu_id, ncores; > > + u32 l2ctlr; > > + phys_addr_t pa; > > + > > + cpu_id = read_cpuid(CPUID_ID) & CPU_MASK; > > + switch (cpu_id) { > > + case CPU_CORTEX_A15: > > + asm("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr)); > > + ncores = ((l2ctlr >> 24) & 3) + 1; > > + break; > > + case CPU_CORTEX_A9: > > + /* Get SCU physical base */ > > + asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa)); > > + scu_base = IO_ADDRESS(pa); > > + ncores = scu_get_core_count(scu_base); > > + break; > > + default: > > + BUG(); > > instead of bugging out, how about setting ncores to 1 instead ?
Maybe that would be useful in the case of adding new ARM core in the future.
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