[PATCH v3 3/8] ARM: MB86S7X: Add MCPM support

[Russell King - ARM Linux]

On Fri, Jan 09, 2015 at 07:28:54PM +0800, Vincent Yang wrote:
> +static int __init mb86s7x_mcpm_init(void)
> +{
> +	unsigned int mpidr, cpu, cluster;
> +	struct mb86s7x_scb_version cmd;
> +	int ret;
> +
> +	if (!cci_probed())
> +		return -ENODEV;
> +
> +	mpidr = read_cpuid_mpidr();
> +	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> +	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> +
> +	pr_info("Booting on cpu_%u cluster_%u\n", cpu, cluster);
> +	mb86s7x_pm_use_count[cluster][cpu] = 1;
> +
> +	/* reset the wfi 'color' for primary cpu */
> +	mb86s7x_set_wficolor(cluster, cpu, AT_WFI_DO_NOTHING);
> +
> +	/* Do SMC to set entry address for CPUs coming online */
> +	mb86s7x_cpu_entry(virt_to_phys(mcpm_entry_point));
> +
> +	cmd.payload_size = sizeof(cmd);
> +	cmd.version = 0;
> +	cmd.config_version = 0;
> +	ret = mb86s7x_send_packet(CMD_SCB_CAPABILITY_GET_REQ,
> +				  &cmd, sizeof(cmd));
> +	if (ret < 0) /* non fatal */
> +		pr_err("%s:%d failed to get SCB version\n",
> +		       __func__, __LINE__);
> +	else
> +		pr_err("MB86S7x SCB version 0x%x:0x%x\n",
> +		       cmd.version, cmd.config_version);
> +
> +	ret = mcpm_platform_register(&mb86s7x_pm_power_ops);
> +	if (!ret)
> +		ret = mcpm_sync_init(mb86s7x_pm_power_up_setup);
> +	if (!ret)
> +		ret = mcpm_loopback(mb86s7x_cache_off); /* turn on the CCI */
> +	if (!ret)
> +		mcpm_smp_set_ops();
> +
> +	return ret;
> +}
> +early_initcall(mb86s7x_mcpm_init);

What happens if this is built into a kernel running on another SoC where
CCI has been probed?

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