Commit-ID: 41f4988cc287e5f836d3f6620c9f900bc9b560e9
Gitweb: http://git.kernel.org/tip/41f4988cc287e5f836d3f6620c9f900bc9b560e9
Author: Andrea Merello <andrea.merello@xxxxxxxxx>
AuthorDate: Sat, 26 Dec 2015 13:47:22 -0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Tue, 29 Dec 2015 11:40:45 +0100
irqchip/bcm2836: Add SMP support for the 2836
The firmware sets the secondaries spinning waiting for a non-NULL
value to show up in the last IPI mailbox.
The original SMP port from the downstream tree was done by Andrea, and
Eric cleaned it up/rewrote it a few times from there.
Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
Cc: Lee Jones <lee@xxxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1451166444-11044-3-git-send-email-eric@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/irqchip/irq-bcm2836.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
index 6ec125e..59ac40c 100644
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -53,14 +53,16 @@
/* Same status bits as above, but for FIQ. */
#define LOCAL_FIQ_PENDING0 0x070
/*
- * Mailbox0 write-to-set bits. There are 16 mailboxes, 4 per CPU, and
+ * Mailbox write-to-set bits. There are 16 mailboxes, 4 per CPU, and
* these bits are organized by mailbox number and then CPU number. We
* use mailbox 0 for IPIs. The mailbox's interrupt is raised while
* any bit is set.
*/
#define LOCAL_MAILBOX0_SET0 0x080
-/* Mailbox0 write-to-clear bits. */
+#define LOCAL_MAILBOX3_SET0 0x08c
+/* Mailbox write-to-clear bits. */
#define LOCAL_MAILBOX0_CLR0 0x0c0
+#define LOCAL_MAILBOX3_CLR0 0x0cc
#define LOCAL_IRQ_CNTPSIRQ 0
#define LOCAL_IRQ_CNTPNSIRQ 1
@@ -220,6 +222,24 @@ static struct notifier_block bcm2836_arm_irqchip_cpu_notifier = {
.notifier_call = bcm2836_arm_irqchip_cpu_notify,
.priority = 100,
};
+
+int __init bcm2836_smp_boot_secondary(unsigned int cpu,
+ struct task_struct *idle)
+{
+ unsigned long secondary_startup_phys =
+ (unsigned long)virt_to_phys((void *)secondary_startup);
+
+ dsb();
+ writel(secondary_startup_phys,
+ intc.base + LOCAL_MAILBOX3_SET0 + 16 * cpu);
+
+ return 0;
+}
+
+static const struct smp_operations bcm2836_smp_ops __initconst = {
+ .smp_boot_secondary = bcm2836_smp_boot_secondary,
+};
+
#endif
static const struct irq_domain_ops bcm2836_arm_irqchip_intc_ops = {
@@ -237,6 +257,7 @@ bcm2836_arm_irqchip_smp_init(void)
register_cpu_notifier(&bcm2836_arm_irqchip_cpu_notifier);
set_smp_cross_call(bcm2836_arm_irqchip_send_ipi);
+ smp_set_ops(&bcm2836_smp_ops);
#endif
}
--
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