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

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Date:   Tue, 29 Jan 2019 15:32:02 +0800
From:   Bibby Hsieh <bibby.hsieh@...iatek.com>
To:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, CK HU <ck.hu@...iatek.com>
CC:     Daniel Kurtz <djkurtz@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        YT Shen <yt.shen@...iatek.com>,
        Daoyuan Huang <daoyuan.huang@...iatek.com>,
        Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <ginny.chen@...iatek.com>, <kendrick.hsu@...iatek.com>,
        Frederic Chen <Frederic.Chen@...iatek.com>
Subject: [PATCH 05/10] soc: mediatek: add subsys-base address transform function

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@...iatek.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