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From: Tzung-Bi Shih <tzungbi@google.com>
To: ohad@wizery.com, bjorn.andersson@linaro.org
Cc: linux-remoteproc@vger.kernel.org, matthias.bgg@gmail.com,
	linux-mediatek@lists.infradead.org, tzungbi@google.com,
	Tinghan Shen <tinghan.shen@mediatek.com>
Subject: [PATCH] remoteproc/mediatek: set to DEVAPC domain 3 for MT8192 SCP
Date: Wed, 17 Mar 2021 11:43:11 +0800	[thread overview]
Message-ID: <20210317034311.2281708-1-tzungbi@google.com> (raw)

DEVAPC (device access permission control) is a MPU (memory protection
unit) in MT8192.

To restrict SCP accesses to a specific memory range, sets SCP to DEVAPC
domain 3.  ATF (Arm trusted firmware) should setup memory range for the
domain.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
---
 drivers/remoteproc/mtk_common.h | 2 ++
 drivers/remoteproc/mtk_scp.c    | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 61901f5efa05..2aa9fdf5e59b 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -51,6 +51,8 @@
 #define MT8192_CORE0_WDT_IRQ		0x10030
 #define MT8192_CORE0_WDT_CFG		0x10034
 
+#define MT8192_SCP_DEVAPC_DOMAIN	0x85080
+
 #define SCP_FW_VER_LEN			32
 #define SCP_SHARE_BUFFER_SIZE		288
 
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 9679cc26895e..50bdec5a97e3 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -374,6 +374,9 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
 	/* enable MPU for all memory regions */
 	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
 
+	/* set to DEVAPC (device access permission control) domain 3 */
+	writel(3, scp->reg_base + MT8192_SCP_DEVAPC_DOMAIN);
+
 	return 0;
 }
 
-- 
2.31.0.rc2.261.g7f71774620-goog


WARNING: multiple messages have this Message-ID (diff)
From: Tzung-Bi Shih <tzungbi@google.com>
To: ohad@wizery.com, bjorn.andersson@linaro.org
Cc: linux-remoteproc@vger.kernel.org, matthias.bgg@gmail.com,
	 linux-mediatek@lists.infradead.org, tzungbi@google.com,
	 Tinghan Shen <tinghan.shen@mediatek.com>
Subject: [PATCH] remoteproc/mediatek: set to DEVAPC domain 3 for MT8192 SCP
Date: Wed, 17 Mar 2021 11:43:11 +0800	[thread overview]
Message-ID: <20210317034311.2281708-1-tzungbi@google.com> (raw)

DEVAPC (device access permission control) is a MPU (memory protection
unit) in MT8192.

To restrict SCP accesses to a specific memory range, sets SCP to DEVAPC
domain 3.  ATF (Arm trusted firmware) should setup memory range for the
domain.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
---
 drivers/remoteproc/mtk_common.h | 2 ++
 drivers/remoteproc/mtk_scp.c    | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 61901f5efa05..2aa9fdf5e59b 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -51,6 +51,8 @@
 #define MT8192_CORE0_WDT_IRQ		0x10030
 #define MT8192_CORE0_WDT_CFG		0x10034
 
+#define MT8192_SCP_DEVAPC_DOMAIN	0x85080
+
 #define SCP_FW_VER_LEN			32
 #define SCP_SHARE_BUFFER_SIZE		288
 
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 9679cc26895e..50bdec5a97e3 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -374,6 +374,9 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
 	/* enable MPU for all memory regions */
 	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
 
+	/* set to DEVAPC (device access permission control) domain 3 */
+	writel(3, scp->reg_base + MT8192_SCP_DEVAPC_DOMAIN);
+
 	return 0;
 }
 
-- 
2.31.0.rc2.261.g7f71774620-goog


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             reply	other threads:[~2021-03-17  3:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17  3:43 Tzung-Bi Shih [this message]
2021-03-17  3:43 ` [PATCH] remoteproc/mediatek: set to DEVAPC domain 3 for MT8192 SCP Tzung-Bi Shih
2021-03-17 19:14 ` Bjorn Andersson
2021-03-17 19:14   ` Bjorn Andersson
2021-03-18  1:27   ` Tzung-Bi Shih
2021-03-18  1:27     ` Tzung-Bi Shih
2021-03-18  1:33     ` Bjorn Andersson
2021-03-18  1:33       ` Bjorn Andersson

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