diff mbox series

[v2] remoteproc/mediatek: set to DEVAPC domain 3 for MT8192 SCP

Message ID 20210318012416.2816574-1-tzungbi@google.com (mailing list archive)
State New, archived
Headers show
Series [v2] remoteproc/mediatek: set to DEVAPC domain 3 for MT8192 SCP | expand

Commit Message

Tzung-Bi Shih March 18, 2021, 1:24 a.m. UTC 
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.

Co-developed-by: Tinghan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
---
Changes from v1:
- Add "Co-developed-by" tag.

 drivers/remoteproc/mtk_common.h | 2 ++
 drivers/remoteproc/mtk_scp.c    | 3 +++
 2 files changed, 5 insertions(+)

Comments

Tinghan Shen March 18, 2021, 6:07 a.m. UTC | #1 
> 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.
>
> Co-developed-by: Tinghan Shen <tinghan.shen@mediatek.com>
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>

Hi,

we want to pull this patch back because we have another thought on how to reach our purpose.
thanks for your review.


Best regards,
TingHan
diff mbox series

Patch

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;
 }