[PATCH 1/5] csky: Init pmu as a device

[Mao Han]

This patch change the csky pmu initialization from arch init to
device init. The pmu can be configued with information from
device tree(pmu device name, irq number and etc.).

Signed-off-by: Mao Han <han_...@c-sky.com>
CC: Guo Ren <guo...@kernel.org>
CC: linux-c...@vger.kernel.org
---
 arch/csky/kernel/perf_event.c | 58 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index 376c972..c022acc 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -21,6 +21,8 @@ struct csky_pmu_t {
        uint32_t        hpcr;
 } csky_pmu;
 
+typedef int (*csky_pmu_init)(struct csky_pmu_t *);
+
 #define cprgr(reg)                             \
 ({                                             \
        unsigned int tmp;                       \
@@ -1028,4 +1030,58 @@ int __init init_hw_perf_events(void)
 
        return perf_pmu_register(&csky_pmu.pmu, "cpu", PERF_TYPE_RAW);
 }
-arch_initcall(init_hw_perf_events);
+
+int csky_pmu_device_probe(struct platform_device *pdev,
+                         const struct of_device_id *of_table)
+{
+       const struct of_device_id *of_id;
+       csky_pmu_init init_fn;
+       struct device_node *node = pdev->dev.of_node;
+       int ret = -ENODEV;
+
+       of_id = of_match_node(of_table, pdev->dev.of_node);
+       if (node && of_id) {
+               init_fn = of_id->data;
+               ret = init_fn(&csky_pmu);
+       }
+
+       if (ret) {
+               pr_notice("[perf] failed to probe PMU!\n");
+               return ret;
+       }
+
+       return ret;
+}
+
+const static struct of_device_id csky_pmu_of_device_ids[] = {
+       {.compatible = "csky,csky-pmu", .data = init_hw_perf_events},
+       {},
+};
+
+static int csky_pmu_dev_probe(struct platform_device *pdev)
+{
+       return csky_pmu_device_probe(pdev, csky_pmu_of_device_ids);
+}
+
+static struct platform_driver csky_pmu_driver = {
+       .driver = {
+                  .name = "csky-pmu",
+                  .of_match_table = csky_pmu_of_device_ids,
+                  },
+       .probe = csky_pmu_dev_probe,
+};
+
+static int __init csky_pmu_probe(void)
+{
+       int ret;
+
+       ret = platform_driver_register(&csky_pmu_driver);
+       if (ret)
+               pr_notice("[perf] PMU initialization failed\n");
+       else
+               pr_notice("[perf] PMU initialization done\n");
+
+       return ret;
+}
+
+device_initcall(csky_pmu_probe);
-- 
2.7.4