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.hs...@mediatek.com>
---
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 80856b8..2def9dc 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -47,6 +47,31 @@ static void cmdq_pkt_instr_encoder(struct cmdq_pkt *pkt, s16
arg_c, s16 arg_b,
pkt->cmd_buf_size += CMDQ_INST_SIZE;
}
+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 -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 0651a0b..574006c 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__ */
--
1.9.1
