[PATCH v5 10/12] soc: mediatek: cmdq: add cmdq_dev_get_subsys function

Bibby Hsieh
2019-05-07T08:13:53Z

GCE cannot know the register base address, this function
can help cmdq client to get the relationship of subsys
and register base address.

Signed-off-by: Bibby Hsieh <bibby.hsieh-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
drivers/soc/mediatek/mtk-cmdq-helper.c | 25 +++++++++++++++++++++++++
include/linux/soc/mediatek/mtk-cmdq.h | 18 ++++++++++++++++++
2 files changed, 43 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 716f8c4f207b..00636ec995e8 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -27,6 +27,31 @@ struct cmdq_instruction {
u8 op;
};

+struct cmdq_subsys *cmdq_dev_get_subsys(struct device *dev, int idx)
+{
+ struct cmdq_subsys *subsys;
+ struct of_phandle_args spec;
+
+ subsys = devm_kzalloc(dev, sizeof(*subsys), GFP_KERNEL);
+ if (!subsys)
+ return NULL;
+
+ if (of_parse_phandle_with_args(dev->of_node, "mediatek,gce-client-reg",
+ "#subsys-cells", idx, &spec)) {
+ dev_err(dev, "can't parse gce-client-reg property");
+
+ return (struct cmdq_subsys *)-ENODEV;
+ }
+
+ subsys->id = spec.args[0];
+ subsys->offset = spec.args[1];
+ subsys->size = spec.args[2];
+ of_node_put(spec.np);
+
+ return subsys;
+}
+EXPORT_SYMBOL(cmdq_dev_get_subsys);
+
static void cmdq_client_timeout(struct timer_list *t)
{
struct cmdq_client *client = from_timer(client, t, timer);
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 0651a0bffa54..574006c5cd76 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -15,6 +15,12 @@

struct cmdq_pkt;

+struct cmdq_subsys {
+ u8 id;
+ u16 offset;
+ u16 size;
+};
+
struct cmdq_client {
spinlock_t lock;
u32 pkt_cnt;
@@ -142,4 +148,16 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
*/
int cmdq_pkt_flush(struct cmdq_pkt *pkt);

+/**
+ * cmdq_dev_get_subsys() - parse sub system from the device node of CMDQ client
+ * @dev: device of CMDQ mailbox client
+ * @idx: the index of desired subsys
+ *
+ * Return: CMDQ subsys pointer
+ *
+ * Help CMDQ client pasing the sub system number
+ * from the device node of CMDQ client.
+ */
+struct cmdq_subsys *cmdq_dev_get_subsys(struct device *dev, int idx);
+
#endif /* __MTK_CMDQ_H__ */
--
2.18.0