linux-kernel - [PATCH v2 2/4] soc: mediatek: mtk-cmdq: Add cmdq_pkt_mem

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Message-ID: <20240307013458.23550-3-jason-jh.lin@mediatek.com>
Date: Thu, 7 Mar 2024 09:34:56 +0800
From: Jason-JH.Lin <jason-jh.lin@...iatek.com>
To: Jassi Brar <jassisinghbrar@...il.com>, Chun-Kuang Hu
	<chunkuang.hu@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>
CC: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Jason-ch Chen <jason-ch.chen@...iatek.com>, "Jason-JH . Lin"
	<jason-jh.lin@...iatek.com>, Singo Chang <singo.chang@...iatek.com>, Nancy
 Lin <nancy.lin@...iatek.com>, Shawn Sung <shawn.sung@...iatek.com>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v2 2/4] soc: mediatek: mtk-cmdq: Add cmdq_pkt_mem_move() function

Add cmdq_pkt_mem_move() function to support CMDQ user making
an instruction for moving a value from a source address to a
destination address.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 26 ++++++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 12 ++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index b0cd071c4719..111b5b47ac8f 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -299,6 +299,32 @@ int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
 }
 EXPORT_SYMBOL(cmdq_pkt_write_s_mask_value);
 
+int cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_addr)
+{
+	const u16 high_addr_reg_idx  = CMDQ_THR_SPR_IDX0;
+	const u16 value_reg_idx = CMDQ_THR_SPR_IDX1;
+	int ret;
+
+	/* read the value of src_addr into high_addr_reg_idx */
+	ret = cmdq_pkt_assign(pkt, high_addr_reg_idx, CMDQ_ADDR_HIGH(src_addr));
+	if (ret < 0)
+		return ret;
+	ret = cmdq_pkt_read_s(pkt, high_addr_reg_idx, CMDQ_ADDR_LOW(src_addr), value_reg_idx);
+	if (ret < 0)
+		return ret;
+
+	/* write the value of value_reg_idx into dst_addr */
+	ret = cmdq_pkt_assign(pkt, high_addr_reg_idx, CMDQ_ADDR_HIGH(dst_addr));
+	if (ret < 0)
+		return ret;
+	ret = cmdq_pkt_write_s(pkt, high_addr_reg_idx, CMDQ_ADDR_LOW(dst_addr), value_reg_idx);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL(cmdq_pkt_mem_move);
+
 int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear)
 {
 	struct cmdq_instruction inst = { {0} };
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 1dae80185f9f..f07c9e2e0855 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -182,6 +182,18 @@ int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
 int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
 				u16 addr_low, u32 value, u32 mask);
 
+/**
+ * cmdq_pkt_mem_move() - append memory move command to the CMDQ packet
+ * @pkt:	the CMDQ packet
+ * @src_addr:	source address
+ * @dst_addr:	destination address
+ *
+ * Appends a CMDQ command to copy the value found in `src_addr` to `dst_addr`.
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_addr);
+
 /**
  * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
  * @pkt:	the CMDQ packet
-- 
2.18.0