linux-kernel - [PATCH v15 2/4] soc: mediatek: cmdq: add polling function

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Message-ID: <20190927114254.6258-3-bibby.hsieh@mediatek.com>
Date:   Fri, 27 Sep 2019 19:42:52 +0800
From:   Bibby Hsieh <bibby.hsieh@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, CK HU <ck.hu@...iatek.com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>
Subject: [PATCH v15 2/4] soc: mediatek: cmdq: add polling function

add polling function in cmdq helper functions

Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
Reviewed-by: CK Hu <ck.hu@...iatek.com>
Reviewed-by: Houlong Wei <houlong.wei@...iatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c   | 41 ++++++++++++++++++++++++
 include/linux/mailbox/mtk-cmdq-mailbox.h |  1 +
 include/linux/soc/mediatek/mtk-cmdq.h    | 32 ++++++++++++++++++
 3 files changed, 74 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 7af327b98d25..8b301f01ff4b 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -236,6 +236,47 @@ int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
 }
 EXPORT_SYMBOL(cmdq_pkt_clear_event);
 
+int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
+		  u16 offset, u32 value)
+{
+	struct cmdq_instruction *inst = kzalloc(sizeof(*inst), GFP_KERNEL);
+	int err = 0;
+
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_POLL;
+	inst->value = value;
+	inst->offset = offset;
+	inst->subsys = subsys;
+
+	err = cmdq_pkt_append_command(pkt, inst);
+	kfree(inst);
+
+	return err;
+}
+EXPORT_SYMBOL(cmdq_pkt_poll);
+
+int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
+		       u16 offset, u32 value, u32 mask)
+{
+	struct cmdq_instruction *inst = kzalloc(sizeof(*inst), GFP_KERNEL);
+	int err = 0;
+
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_MASK;
+	inst->mask = ~mask;
+	err = cmdq_pkt_append_command(pkt, inst);
+	offset = offset | 0x1;
+	err |= cmdq_pkt_poll(pkt, subsys, offset, value);
+	kfree(inst);
+
+	return err;
+}
+EXPORT_SYMBOL(cmdq_pkt_poll_mask);
+
 static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 {
 	struct cmdq_instruction *inst = kzalloc(sizeof(*inst), GFP_KERNEL);
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index 678760548791..a4dc45fbec0a 100644
--- a/include/linux/mailbox/mtk-cmdq-mailbox.h
+++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
@@ -55,6 +55,7 @@
 enum cmdq_code {
 	CMDQ_CODE_MASK = 0x02,
 	CMDQ_CODE_WRITE = 0x04,
+	CMDQ_CODE_POLL = 0x08,
 	CMDQ_CODE_JUMP = 0x10,
 	CMDQ_CODE_WFE = 0x20,
 	CMDQ_CODE_EOC = 0x40,
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 9618debb9ceb..92bd5b5c6341 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -99,6 +99,38 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event);
  */
 int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event);
 
+/**
+ * cmdq_pkt_poll() - Append polling command to the CMDQ packet, ask GCE to
+ *		     execute an instruction that wait for a specified
+ *		     hardware register to check for the value w/o mask.
+ *		     All GCE hardware threads will be blocked by this
+ *		     instruction.
+ * @pkt:	the CMDQ packet
+ * @subsys:	the CMDQ sub system code
+ * @offset:	register offset from CMDQ sub system
+ * @value:	the specified target register value
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
+		  u16 offset, u32 value);
+
+/**
+ * cmdq_pkt_poll_mask() - Append polling command to the CMDQ packet, ask GCE to
+ *		          execute an instruction that wait for a specified
+ *		          hardware register to check for the value w/ mask.
+ *		          All GCE hardware threads will be blocked by this
+ *		          instruction.
+ * @pkt:	the CMDQ packet
+ * @subsys:	the CMDQ sub system code
+ * @offset:	register offset from CMDQ sub system
+ * @value:	the specified target register value
+ * @mask:	the specified target register mask
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
+		       u16 offset, u32 value, u32 mask);
 /**
  * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
  *                          packet and call back at the end of done packet
-- 
2.18.0