linux-kernel - [RESEND, PATCH 5/5] mailbox: mtk-cmdq: Add support runtime get and set GCE event

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Date: Fri, 1 Mar 2024 22:44:03 +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: [RESEND, PATCH 5/5] mailbox: mtk-cmdq: Add support runtime get and set GCE event

ISP drivers need to get and set GCE event in their runtime contorl flow.
So add these functions to support get and set GCE by CPU.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c       | 37 ++++++++++++++++++++++++
 include/linux/mailbox/mtk-cmdq-mailbox.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index ead2200f39ba..d7c08249c898 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -25,7 +25,11 @@
 #define CMDQ_GCE_NUM_MAX		(2)
 
 #define CMDQ_CURR_IRQ_STATUS		0x10
+#define CMDQ_SYNC_TOKEN_ID		0x60
+#define CMDQ_SYNC_TOKEN_VALUE		0x64
+#define CMDQ_TOKEN_ID_MASK			GENMASK(9, 0)
 #define CMDQ_SYNC_TOKEN_UPDATE		0x68
+#define CMDQ_TOKEN_UPDATE_VALUE			BIT(16)
 #define CMDQ_THR_SLOT_CYCLES		0x30
 #define CMDQ_THR_BASE			0x100
 #define CMDQ_THR_SIZE			0x80
@@ -83,6 +87,7 @@ struct cmdq {
 	struct cmdq_thread	*thread;
 	struct clk_bulk_data	clocks[CMDQ_GCE_NUM_MAX];
 	bool			suspended;
+	spinlock_t		event_lock; /* lock for gce event */
 };
 
 struct gce_plat {
@@ -113,6 +118,38 @@ u8 cmdq_get_shift_pa(struct mbox_chan *chan)
 }
 EXPORT_SYMBOL(cmdq_get_shift_pa);
 
+void cmdq_set_event(void *chan, u16 event_id)
+{
+	struct cmdq *cmdq = container_of(((struct mbox_chan *)chan)->mbox,
+		typeof(*cmdq), mbox);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cmdq->event_lock, flags);
+
+	writel(CMDQ_TOKEN_UPDATE_VALUE | event_id, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
+
+	spin_unlock_irqrestore(&cmdq->event_lock, flags);
+}
+EXPORT_SYMBOL(cmdq_set_event);
+
+u32 cmdq_get_event(void *chan, u16 event_id)
+{
+	struct cmdq *cmdq = container_of(((struct mbox_chan *)chan)->mbox,
+		typeof(*cmdq), mbox);
+	unsigned long flags;
+	u32 value = 0;
+
+	spin_lock_irqsave(&cmdq->event_lock, flags);
+
+	writel(CMDQ_TOKEN_ID_MASK & event_id, cmdq->base + CMDQ_SYNC_TOKEN_ID);
+	value = readl(cmdq->base + CMDQ_SYNC_TOKEN_VALUE);
+
+	spin_unlock_irqrestore(&cmdq->event_lock, flags);
+
+	return value;
+}
+EXPORT_SYMBOL(cmdq_get_event);
+
 static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
 {
 	u32 status;
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index a8f0070c7aa9..f05cabd230da 100644
--- a/include/linux/mailbox/mtk-cmdq-mailbox.h
+++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
@@ -79,5 +79,7 @@ struct cmdq_pkt {
 };
 
 u8 cmdq_get_shift_pa(struct mbox_chan *chan);
+void cmdq_set_event(void *chan, u16 event_id);
+u32 cmdq_get_event(void *chan, u16 event_id);
 
 #endif /* __MTK_CMDQ_MAILBOX_H__ */
-- 
2.18.0