[PATCH 05/10] soc: mediatek: add subsys-base address transform function

[Bibby Hsieh <bibby.hsieh@mediatek.com>]

GCE cannot know the register base address, we store the subsys-base address
relationship in the device node, and store the relationship by
cmdq_register_device function.

When the client pass the base address and offset into GCE API,
we will get the subsys ID by this API.

Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 17 +++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 12 ++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index ff9fef5..6e4b85e 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -15,6 +15,23 @@
 #define CMDQ_EOC_CMD		((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
 				<< 32 | CMDQ_EOC_IRQ_EN)
 
+u8 cmdq_subsys_base_to_id(struct cmdq_base *clt_base, u32 base)
+{
+	u8 i;
+
+	if (!clt_base)
+		return -EINVAL;
+
+	base = base & 0xFFFF0000;
+	for (i = 0; i < clt_base->count; i++) {
+		if (clt_base->subsys[i].base == base)
+			return clt_base->subsys[i].id;
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(cmdq_subsys_base_to_id);
+
 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 4e88999..0c7a6ee 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -15,6 +15,16 @@
 
 struct cmdq_pkt;
 
+struct cmdq_subsys {
+	u32 base;
+	u8 id;
+};
+
+struct cmdq_base {
+	struct cmdq_subsys subsys[32];
+	u8 count;
+};
+
 struct cmdq_client {
 	spinlock_t lock;
 	u32 pkt_cnt;
@@ -127,4 +137,6 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
  */
 int cmdq_pkt_flush(struct cmdq_pkt *pkt);
 
+u8 cmdq_subsys_base_to_id(struct cmdq_base *clt_base, u32 base);
+
 #endif	/* __MTK_CMDQ_H__ */
-- 
1.9.1