iommu/mediatek: Add flag for legacy ivrp paddr

Add a new flag in order to select which IVRP_PADDR format is used
by an SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20200907101649.1573134-2-fparent@baylibre.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/mtk_iommu.c

@@ -118,6 +118,7 @@
 #define OUT_ORDER_WR_EN			BIT(4)
 #define HAS_SUB_COMM			BIT(5)
 #define WR_THROT_EN			BIT(6)
+#define HAS_LEGACY_IVRP_PADDR		BIT(7)
 
 #define MTK_IOMMU_HAS_FLAG(pdata, _x) \
 		((((pdata)->flags) & (_x)) == (_x))
@@ -584,7 +585,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
 	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
 
-	if (data->plat_data->m4u_plat == M4U_MT8173)
+	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR))
 		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
 	else
 		regval = lower_32_bits(data->protect_base) |
@@ -841,7 +842,8 @@ static const struct mtk_iommu_plat_data mt6779_data = {
 
 static const struct mtk_iommu_plat_data mt8173_data = {
 	.m4u_plat     = M4U_MT8173,
-	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI,
+	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
+			HAS_LEGACY_IVRP_PADDR,
 	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
 	.larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
 };