One more comment on this patch below.
* Santosh Shilimkar <[email protected]> [090507 00:29]:
> This patch adds SMP platform files support for OMAP4430SDP. TI's OMAP4430
> SOC is based on ARM Cortex-A9 SMP architecture. It's a dual core SOC
> with GIC used for interrupt handling and SCU for cache coherency.
>
> Signed-off-by: Santosh Shilimkar <[email protected]>
> ---
> arch/arm/mach-omap2/omap-headsmp.S | 49 +++++++
> arch/arm/mach-omap2/omap-smp.c | 238
> +++++++++++++++++++++++++++++++++
> arch/arm/plat-omap/include/mach/scu.h | 28 ++++
> arch/arm/plat-omap/include/mach/smp.h | 56 ++++++++
> 4 files changed, 371 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-omap2/omap-headsmp.S
> create mode 100644 arch/arm/mach-omap2/omap-smp.c
> create mode 100644 arch/arm/plat-omap/include/mach/scu.h
> create mode 100644 arch/arm/plat-omap/include/mach/smp.h
>
> diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
> new file mode 100644
> index 0000000..1d18acb
> --- /dev/null
> +++ b/arch/arm/mach-omap2/omap-smp.c
<snip snip>
> +int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
> +{
> + unsigned long timeout;
> +
> + /*
> + * Set synchronisation state between this boot processor
> + * and the secondary one
> + */
> + spin_lock(&boot_lock);
> +
> + /*
> + * The secondary processor is waiting for an event to come out of
> + * wfe. Release it, then wait for it to flag that it has been
> + * released by resetting cpu_release.
> + *
> + * Singal the ROM code that the secondary core can be released
> + */
> + cpu_release = cpu;
> + __raw_writel(cpu, OMAP4_AUXCOREBOOT_REG1);
> + flush_cache_all();
> + /*
> + * Send a 'sev' to wake the secondary core again because
> + * ROM code will put core in WFE till the cpu_release
> + * flag is set.
> + */
> + set_event();
> + mb();
> +
> + timeout = jiffies + (1 * HZ);
> + while (time_before(jiffies, timeout)) {
> + smp_rmb();
> + if (cpu_release == -1)
> + break;
> +
> + udelay(10);
> + }
> +
> + /*
> + * Now the secondary core is starting up let it run its
> + * calibrations, then wait for it to finish
> + */
> + spin_unlock(&boot_lock);
> +
> + return cpu_release != -1 ? -ENOSYS : 0;
> +}
The "Singal" should be "Signal" above :)
Tony
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