[PATCH v8 19/21] memory: mtk-smi: Get rid of need_larbid

Yong Wu yong.wu at mediatek.com
Fri Jun 28 19:39:53 PDT 2019


The "mediatek,larb-id" has already been parsed in MTK IOMMU driver.
It's no need to parse it again in SMI driver. Only clean some codes.
This patch is fit for all the current mt2701, mt2712, mt7623, mt8173
and mt8183.

After this patch, the "mediatek,larb-id" only be needed for mt2712
which have 2 M4Us. In the other SoCs, we can get the larb-id from M4U
in which the larbs in the "mediatek,larbs" always are ordered.

Correspondingly, the larb_nr in the "struct mtk_smi_iommu" could also
be deleted.

CC: Matthias Brugger <matthias.bgg at gmail.com>
Signed-off-by: Yong Wu <yong.wu at mediatek.com>
Reviewed-by: Evan Green <evgreen at chromium.org>
Reviewed-by: Matthias Brugger <matthias.bgg at gmail.com>
---
 drivers/iommu/mtk_iommu.c    |  1 -
 drivers/iommu/mtk_iommu_v1.c |  2 --
 drivers/memory/mtk-smi.c     | 26 ++------------------------
 include/soc/mediatek/smi.h   |  1 -
 4 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 24600aa..fcf18d7 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -654,7 +654,6 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 					     "mediatek,larbs", NULL);
 	if (larb_nr < 0)
 		return larb_nr;
-	data->smi_imu.larb_nr = larb_nr;
 
 	for (i = 0; i < larb_nr; i++) {
 		struct device_node *larbnode;
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 52b01e3..73308ad 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -624,8 +624,6 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 		larb_nr++;
 	}
 
-	data->smi_imu.larb_nr = larb_nr;
-
 	platform_set_drvdata(pdev, data);
 
 	ret = mtk_iommu_hw_init(data);
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 71cb2cf..7d13a0b 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -67,7 +67,6 @@ struct mtk_smi_common_plat {
 };
 
 struct mtk_smi_larb_gen {
-	bool need_larbid;
 	int port_in_larb[MTK_LARB_NR_MAX + 1];
 	void (*config_port)(struct device *);
 	unsigned int larb_direct_to_common_mask;
@@ -155,18 +154,9 @@ void mtk_smi_larb_put(struct device *larbdev)
 	struct mtk_smi_iommu *smi_iommu = data;
 	unsigned int         i;
 
-	if (larb->larb_gen->need_larbid) {
-		larb->mmu = &smi_iommu->larb_imu[larb->larbid].mmu;
-		return 0;
-	}
-
-	/*
-	 * If there is no larbid property, Loop to find the corresponding
-	 * iommu information.
-	 */
-	for (i = 0; i < smi_iommu->larb_nr; i++) {
+	for (i = 0; i < MTK_LARB_NR_MAX; i++) {
 		if (dev == smi_iommu->larb_imu[i].dev) {
-			/* The 'mmu' may be updated in iommu-attach/detach. */
+			larb->larbid = i;
 			larb->mmu = &smi_iommu->larb_imu[i].mmu;
 			return 0;
 		}
@@ -245,7 +235,6 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
 };
 
 static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
-	.need_larbid = true,
 	.port_in_larb = {
 		LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
 		LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
@@ -254,7 +243,6 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
 };
 
 static const struct mtk_smi_larb_gen mtk_smi_larb_mt2712 = {
-	.need_larbid = true,
 	.config_port                = mtk_smi_larb_config_port_gen2_general,
 	.larb_direct_to_common_mask = BIT(8) | BIT(9),      /* bdpsys */
 };
@@ -293,7 +281,6 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *smi_node;
 	struct platform_device *smi_pdev;
-	int err;
 
 	larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
 	if (!larb)
@@ -323,15 +310,6 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
 	}
 	larb->smi.dev = dev;
 
-	if (larb->larb_gen->need_larbid) {
-		err = of_property_read_u32(dev->of_node, "mediatek,larb-id",
-					   &larb->larbid);
-		if (err) {
-			dev_err(dev, "missing larbid property\n");
-			return err;
-		}
-	}
-
 	smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
 	if (!smi_node)
 		return -EINVAL;
diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h
index 5201e90..a65324d 100644
--- a/include/soc/mediatek/smi.h
+++ b/include/soc/mediatek/smi.h
@@ -29,7 +29,6 @@ struct mtk_smi_larb_iommu {
 };
 
 struct mtk_smi_iommu {
-	unsigned int larb_nr;
 	struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX];
 };
 
-- 
1.9.1




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