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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/arch/arm/mach-socfpga/platsmp.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/arch/arm/mach-socfpga/platsmp.c')
-rw-r--r--kernel/arch/arm/mach-socfpga/platsmp.c70
1 files changed, 52 insertions, 18 deletions
diff --git a/kernel/arch/arm/mach-socfpga/platsmp.c b/kernel/arch/arm/mach-socfpga/platsmp.c
index 79c5336c5..15c8ce896 100644
--- a/kernel/arch/arm/mach-socfpga/platsmp.c
+++ b/kernel/arch/arm/mach-socfpga/platsmp.c
@@ -54,32 +54,43 @@ static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
return 0;
}
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-static void __init socfpga_smp_init_cpus(void)
+static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
- unsigned int i, ncores;
+ int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
- ncores = scu_get_core_count(socfpga_scu_base_addr);
+ if (socfpga_cpu1start_addr) {
+ writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
+ SOCFPGA_A10_RSTMGR_MODMPURST);
+ memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
+
+ writel(virt_to_phys(secondary_startup),
+ sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
- for (i = 0; i < ncores; i++)
- set_cpu_possible(i, true);
+ flush_cache_all();
+ smp_wmb();
+ outer_clean_range(0, trampoline_size);
- /* sanity check */
- if (ncores > num_possible_cpus()) {
- pr_warn("socfpga: no. of cores (%d) greater than configured"
- "maximum of %d - clipping\n", ncores, num_possible_cpus());
- ncores = num_possible_cpus();
+ /* This will release CPU #1 out of reset. */
+ writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
}
- for (i = 0; i < ncores; i++)
- set_cpu_possible(i, true);
+ return 0;
}
static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
{
+ struct device_node *np;
+ void __iomem *socfpga_scu_base_addr;
+
+ np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+ if (!np) {
+ pr_err("%s: missing scu\n", __func__);
+ return;
+ }
+
+ socfpga_scu_base_addr = of_iomap(np, 0);
+ if (!socfpga_scu_base_addr)
+ return;
scu_enable(socfpga_scu_base_addr);
}
@@ -95,11 +106,34 @@ static void socfpga_cpu_die(unsigned int cpu)
cpu_do_idle();
}
-struct smp_operations socfpga_smp_ops __initdata = {
- .smp_init_cpus = socfpga_smp_init_cpus,
+/*
+ * We need a dummy function so that platform_can_cpu_hotplug() knows
+ * we support CPU hotplug. However, the function does not need to do
+ * anything, because CPUs going offline just do WFI. We could reset
+ * the CPUs but it would increase power consumption.
+ */
+static int socfpga_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+
+static struct smp_operations socfpga_smp_ops __initdata = {
.smp_prepare_cpus = socfpga_smp_prepare_cpus,
.smp_boot_secondary = socfpga_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = socfpga_cpu_die,
+ .cpu_kill = socfpga_cpu_kill,
#endif
};
+
+static struct smp_operations socfpga_a10_smp_ops __initdata = {
+ .smp_prepare_cpus = socfpga_smp_prepare_cpus,
+ .smp_boot_secondary = socfpga_a10_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = socfpga_cpu_die,
+ .cpu_kill = socfpga_cpu_kill,
+#endif
+};
+
+CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
+CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);