On Thu, 2020-06-18 at 18:00 +0200, Matthias Brugger wrote:

On 18/06/2020 13:54, chao hao wrote:

quoted

On Wed, 2020-06-17 at 11:33 +0200, Matthias Brugger wrote:

quoted

On 17/06/2020 05:00, Chao Hao wrote:

quoted

1. Start from mt6779, INVLDT_SEL move to offset=0x2c, so we add
   REG_MMU_INV_SEL_GEN2 definition and mt6779 uses it.
2. Change PROTECT_PA_ALIGN from 128 byte to 256 byte.
3. For REG_MMU_CTRL_REG register, we only need to change bit[2:0],
   others bits keep default value, ex: enable victim tlb.
4. Add mt6779_data to support mm_iommu HW init.

Change since v3:
1. When setting MMU_CTRL_REG, we don't need to include mt8173.

Cc: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Chao Hao <redacted>
---
 drivers/iommu/mtk_iommu.c | 20 ++++++++++++++++++--
 drivers/iommu/mtk_iommu.h |  1 +
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index c706bca6487e..def2e996683f 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c

@@ -37,6 +37,11 @@
 #define REG_MMU_INVLD_START_A			0x024
 #define REG_MMU_INVLD_END_A			0x028
 
+/* In latest Coda, MMU_INV_SEL's offset is changed to 0x02c.
+ * So we named offset = 0x02c to "REG_MMU_INV_SEL_GEN2"
+ * and offset = 0x038 to "REG_MMU_INV_SEL_GEN1".
+ */

Please delete the comment, this should be understandable from the git history

ok, thanks

quoted

quoted

+#define REG_MMU_INV_SEL_GEN2			0x02c
 #define REG_MMU_INV_SEL_GEN1			0x038
 #define F_INVLD_EN0				BIT(0)
 #define F_INVLD_EN1				BIT(1)

@@ -98,7 +103,7 @@
 #define F_MMU_INT_ID_LARB_ID(a)			(((a) >> 7) & 0x7)
 #define F_MMU_INT_ID_PORT_ID(a)			(((a) >> 2) & 0x1f)
 
-#define MTK_PROTECT_PA_ALIGN			128
+#define MTK_PROTECT_PA_ALIGN			256

Do we need 512 bytes for all gen2 IOMMUs?
I'm not sure if we should add this in plat_data or if we should just bump up the
value for all SoCs.
In both cases this should be a separate patch.

From mt6779, MTK_PROTECT_PA_ALIGN is extend to 256 bytes and don't be
changed for a long time from our HW designer comment. The legacy iommu
also can use it, mabye it doesn't set it by platform.

Ok then just bump it to 256 in a new patch. Thanks for clarification.

  Ok, thanks

quoted

quoted

quoted

 
 /*
  * Get the local arbiter ID and the portid within the larb arbiter

@@ -543,11 +548,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 		return ret;
 	}
 
+	regval = readl_relaxed(data->base + REG_MMU_CTRL_REG);
 	if (data->plat_data->m4u_plat == M4U_MT8173)
 		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
 			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
 	else
-		regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR;
+		regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR;

Why do we change this, is it that the bootloader for mt6779 set some values in
the register we have to keep? In this case I think we should update the regval
accordingly.

For REG_MMU_CTRL_REG, bit[12] represents victim_tlb_en feature and
victim_tlb is enable defaultly(bit[12]=1),but if we use "regval =
F_MMU_TF_PROT_TO_PROGRAM_ADDR", victim_tlb will disable, it will drop
iommu performace for mt6779

Got it. Please put that in a separate patch then.

  Ok, thanks

Regards,
Matthias

quoted

quoted

quoted

 	writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
 
 	regval = F_L2_MULIT_HIT_EN |

@@ -797,6 +803,15 @@ static const struct mtk_iommu_plat_data mt2712_data = {
 	.larbid_remap   = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
 };
 
+static const struct mtk_iommu_plat_data mt6779_data = {
+	.m4u_plat      = M4U_MT6779,
+	.has_sub_comm  = true,
+	.has_wr_len    = true,
+	.has_misc_ctrl = true,
+	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
+	.larbid_remap  = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
+};
+
 static const struct mtk_iommu_plat_data mt8173_data = {
 	.m4u_plat     = M4U_MT8173,
 	.has_4gb_mode = true,

@@ -815,6 +830,7 @@ static const struct mtk_iommu_plat_data mt8183_data = {
 
 static const struct of_device_id mtk_iommu_of_ids[] = {
 	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
+	{ .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data},
 	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
 	{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
 	{}

diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 9971cedd72ea..fb79e710c8d9 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h

@@ -31,6 +31,7 @@ struct mtk_iommu_suspend_reg {
 enum mtk_iommu_plat {
 	M4U_MT2701,
 	M4U_MT2712,
+	M4U_MT6779,
 	M4U_MT8173,
 	M4U_MT8183,
 };

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