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Diffstat (limited to 'kernel/arch/arm/mach-sti/platsmp.c')
-rw-r--r--kernel/arch/arm/mach-sti/platsmp.c57
1 files changed, 52 insertions, 5 deletions
diff --git a/kernel/arch/arm/mach-sti/platsmp.c b/kernel/arch/arm/mach-sti/platsmp.c
index 56d402812..e830b20b2 100644
--- a/kernel/arch/arm/mach-sti/platsmp.c
+++ b/kernel/arch/arm/mach-sti/platsmp.c
@@ -20,6 +20,7 @@
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
@@ -38,8 +39,6 @@ static DEFINE_RAW_SPINLOCK(boot_lock);
static void sti_secondary_init(unsigned int cpu)
{
- trace_hardirqs_off();
-
/*
* let the primary processor know we're out of the
* pen, then head off into the C entry point
@@ -99,14 +98,62 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
{
- void __iomem *scu_base = NULL;
- struct device_node *np = of_find_compatible_node(
- NULL, NULL, "arm,cortex-a9-scu");
+ struct device_node *np;
+ void __iomem *scu_base;
+ u32 __iomem *cpu_strt_ptr;
+ u32 release_phys;
+ int cpu;
+ unsigned long entry_pa = virt_to_phys(sti_secondary_startup);
+
+ np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+
if (np) {
scu_base = of_iomap(np, 0);
scu_enable(scu_base);
of_node_put(np);
}
+
+ if (max_cpus <= 1)
+ return;
+
+ for_each_possible_cpu(cpu) {
+
+ np = of_get_cpu_node(cpu, NULL);
+
+ if (!np)
+ continue;
+
+ if (of_property_read_u32(np, "cpu-release-addr",
+ &release_phys)) {
+ pr_err("CPU %d: missing or invalid cpu-release-addr "
+ "property\n", cpu);
+ continue;
+ }
+
+ /*
+ * holding pen is usually configured in SBC DMEM but can also be
+ * in RAM.
+ */
+
+ if (!memblock_is_memory(release_phys))
+ cpu_strt_ptr =
+ ioremap(release_phys, sizeof(release_phys));
+ else
+ cpu_strt_ptr =
+ (u32 __iomem *)phys_to_virt(release_phys);
+
+ __raw_writel(entry_pa, cpu_strt_ptr);
+
+ /*
+ * wmb so that data is actually written
+ * before cache flush is done
+ */
+ smp_wmb();
+ sync_cache_w(cpu_strt_ptr);
+
+ if (!memblock_is_memory(release_phys))
+ iounmap(cpu_strt_ptr);
+ }
}
struct smp_operations __initdata sti_smp_ops = {