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drivers: ARM CCI: Add a platform driver stub for the PMU

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This is a hack to enable the old CCI PMU patches to be used with the new
CCI driver. The CCI PMU is (mis)represented by a separate node in TC2
device-tree.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Jon Medhurst
2013-05-10 14:47:27 +01:00
parent 1d36a70525
commit 0b9bd1cc8d
2 changed files with 61 additions and 0 deletions
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10
arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
View File

@@ -129,6 +129,16 @@
};
};
cci-pmu@2c099000 {
compatible = "arm,cci-400-pmu";
reg = <0 0x2c099000 0 0x6000>;
interrupts = <0 101 4>,
<0 102 4>,
<0 103 4>,
<0 104 4>,
<0 105 4>;
};
memory-controller@7ffd0000 {
compatible = "arm,pl354", "arm,primecell";
reg = <0 0x7ffd0000 0 0x1000>;

51
drivers/bus/arm-cci.c
View File

@@ -17,12 +17,15 @@
#include <linux/arm-cci.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#define DRIVER_NAME "CCI"
#define CCI_PORT_CTRL 0x0
#define CCI_CTRL_STATUS 0xc
@@ -54,6 +57,53 @@ static unsigned int nb_cci_ports;
static void __iomem *cci_ctrl_base;
static unsigned long cci_ctrl_phys;
#ifdef CONFIG_HW_PERF_EVENTS
static void __iomem *cci_pmu_base;
static int cci_pmu_probe(struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
cci_pmu_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(cci_pmu_base))
return PTR_ERR(cci_pmu_base);
return 0;
}
static const struct of_device_id arm_cci_pmu_matches[] = {
{.compatible = "arm,cci-400-pmu"},
{},
};
static struct platform_driver cci_pmu_platform_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = arm_cci_pmu_matches,
},
.probe = cci_pmu_probe,
};
static int __init cci_pmu_init(void)
{
if (platform_driver_register(&cci_pmu_platform_driver))
WARN(1, "unable to register CCI platform driver\n");
return 0;
}
#else
static int __init cci_pmu_init(void)
{
return 0;
}
static void cci_pmu_destroy(void) { }
#endif /* CONFIG_HW_PERF_EVENTS */
struct cpu_port {
u64 mpidr;
u32 port;
@@ -529,5 +579,6 @@ bool __init cci_probed(void)
EXPORT_SYMBOL_GPL(cci_probed);
early_initcall(cci_init);
core_initcall(cci_pmu_init);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ARM CCI support");