[PATCH v2] bus: imx-aipstz: set default value for opacr registers

[Shengjiu Wang]

The sdma script app_2_mcu needs the permission to access the peripheral
devices:

1) SDMA2 transactions are set to user-mode in this particular case.
2) This type of script doesn't use the peripheral interface (connected
directly to SPBA), but it uses the peripheral DMA interface, then the
SDMA2-issued transactions are subjected to AIPSTZ5's security-related
checks.

So need to clear the Supervisor Protect bit of SPBA2, otherwise the sdma
script can't work. As the imx-aipstz is a common driver for all aips bus,
so set default value (zero) for all opacr registers.

Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
---
Changes in v2:
- refine the commit message
- remove the unneeded initialize value

 drivers/bus/imx-aipstz.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/bus/imx-aipstz.c b/drivers/bus/imx-aipstz.c
index 5fdf377f5d06..83371e5b35a2 100644
--- a/drivers/bus/imx-aipstz.c
+++ b/drivers/bus/imx-aipstz.c
@@ -11,9 +11,19 @@
 #include <linux/regmap.h>
 
 #define IMX_AIPSTZ_MPR0 0x0
+#define IMX_AIPSTZ_OPACR0 0x40
+#define IMX_AIPSTZ_OPACR1 0x44
+#define IMX_AIPSTZ_OPACR2 0x48
+#define IMX_AIPSTZ_OPACR3 0x4c
+#define IMX_AIPSTZ_OPACR4 0x50
 
 struct imx_aipstz_config {
 	u32 mpr0;
+	u32 opacr0;
+	u32 opacr1;
+	u32 opacr2;
+	u32 opacr3;
+	u32 opacr4;
 };
 
 struct imx_aipstz_data {
@@ -24,6 +34,11 @@ struct imx_aipstz_data {
 static void imx_aipstz_apply_default(struct imx_aipstz_data *data)
 {
 	writel(data->default_cfg->mpr0, data->base + IMX_AIPSTZ_MPR0);
+	writel(data->default_cfg->opacr0, data->base + IMX_AIPSTZ_OPACR0);
+	writel(data->default_cfg->opacr1, data->base + IMX_AIPSTZ_OPACR1);
+	writel(data->default_cfg->opacr2, data->base + IMX_AIPSTZ_OPACR2);
+	writel(data->default_cfg->opacr3, data->base + IMX_AIPSTZ_OPACR3);
+	writel(data->default_cfg->opacr4, data->base + IMX_AIPSTZ_OPACR4);
 }
 
 static const struct of_device_id imx_aipstz_match_table[] = {
-- 
2.34.1