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ARM: BCM23550 SMP support 

BCM23550 has a Cluster Dormant Control IP block that holds cores
in an idle state. Support a new CPU enable method in which the CDC is
accessed to bring the core online.

Signed-off-by: Raymond Ngun <raymond.ngun@broadcom.com>
Signed-off-by: Chris Brand <chris.brand@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Chris Brand 2016-05-11 14:36:21 -07:00 committed by Florian Fainelli
parent 4533d5f7dd
commit 5fcf999abf
1 changed files with 58 additions and 0 deletions
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58
arch/arm/mach-bcm/platsmp.c
View File

@ -19,6 +19,7 @@
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/sched.h>
#include <linux/smp.h>
@ -255,6 +256,57 @@ static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
return -ENXIO;
}
/* Cluster Dormant Control command to bring CPU into a running state */
#define CDC_CMD 6
#define CDC_CMD_OFFSET 0
#define CDC_CMD_REG(cpu) (CDC_CMD_OFFSET + 4*(cpu))
/*
* BCM23550 has a Cluster Dormant Control block that keeps the core in
* idle state. A command needs to be sent to the block to bring the CPU
* into running state.
*/
static int bcm23550_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
void __iomem *cdc_base;
struct device_node *dn;
char *name;
int ret;
/* Make sure a CDC node exists before booting the
* secondary core.
*/
name = "brcm,bcm23550-cdc";
dn = of_find_compatible_node(NULL, NULL, name);
if (!dn) {
pr_err("unable to find cdc node\n");
return -ENODEV;
}
cdc_base = of_iomap(dn, 0);
of_node_put(dn);
if (!cdc_base) {
pr_err("unable to remap cdc base register\n");
return -ENOMEM;
}
/* Boot the secondary core */
ret = kona_boot_secondary(cpu, idle);
if (ret)
goto out;
/* Bring this CPU to RUN state so that nIRQ nFIQ
* signals are unblocked.
*/
writel_relaxed(CDC_CMD, cdc_base + CDC_CMD_REG(cpu));
out:
iounmap(cdc_base);
return ret;
}
static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
int ret;
@ -283,6 +335,12 @@ static const struct smp_operations bcm_smp_ops __initconst = {
CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
&bcm_smp_ops);
static const struct smp_operations bcm23550_smp_ops __initconst = {
.smp_boot_secondary = bcm23550_boot_secondary,
};
CPU_METHOD_OF_DECLARE(bcm_smp_bcm23550, "brcm,bcm23550",
&bcm23550_smp_ops);
static const struct smp_operations nsp_smp_ops __initconst = {
.smp_prepare_cpus = bcm_smp_prepare_cpus,
.smp_boot_secondary = nsp_boot_secondary,