[PATCH 4.16 142/272] iommu/mediatek: Fix protect memory setting

Greg Kroah-Hartman
2018-05-28T11:10:38Z

From: Yong Wu <yong.wu@mediatek.com>

[ Upstream commit 70ca608b2ec6dafa6bb1c2b0691852fc78f8f717 ]

In MediaTek's IOMMU design, When a iommu translation fault occurs
(HW can NOT translate the destination address to a valid physical
address), the IOMMU HW output the dirty data into a special memory
to avoid corrupting the main memory, this is called "protect memory".
the register(0x114) for protect memory is a little different between
mt8173 and mt2712.

In the mt8173, bit[30:6] in the register represents [31:7] of the
physical address. In the 4GB mode, the register bit[31] should be 1.
While in the mt2712, the bits don't shift. bit[31:7] in the register
represents [31:7] in the physical address, and bit[1:0] in the
register represents bit[33:32] of the physical address if it has.

Fixes: e6dec9230862 ("iommu/mediatek: Add mt2712 IOMMU support")
Reported-by: Honghui Zhang <honghui.zhang@mediatek.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iommu/mtk_iommu.c | 15 ++++++++++-----
drivers/iommu/mtk_iommu.h | 1 +
2 files changed, 11 insertions(+), 5 deletions(-)

--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -60,7 +60,7 @@
(((prot) & 0x3) << F_MMU_TF_PROTECT_SEL_SHIFT(data))

#define REG_MMU_IVRP_PADDR 0x114
-#define F_MMU_IVRP_PA_SET(pa, ext) (((pa) >> 1) | ((!!(ext)) << 31))
+
#define REG_MMU_VLD_PA_RNG 0x118
#define F_MMU_VLD_PA_RNG(EA, SA) (((EA) << 8) | (SA))

@@ -539,8 +539,13 @@ static int mtk_iommu_hw_init(const struc
F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);

- writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB),
- data->base + REG_MMU_IVRP_PADDR);
+ if (data->m4u_plat == M4U_MT8173)
+ regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
+ else
+ regval = lower_32_bits(data->protect_base) |
+ upper_32_bits(data->protect_base);
+ writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
+
if (data->enable_4GB && data->m4u_plat != M4U_MT8173) {
/*
* If 4GB mode is enabled, the validate PA range is from
@@ -695,6 +700,7 @@ static int __maybe_unused mtk_iommu_susp
reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
+ reg->ivrp_paddr = readl_relaxed(base + REG_MMU_IVRP_PADDR);
clk_disable_unprepare(data->bclk);
return 0;
}
@@ -717,8 +723,7 @@ static int __maybe_unused mtk_iommu_resu
writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
- writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB),
- base + REG_MMU_IVRP_PADDR);
+ writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
if (data->m4u_dom)
writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
base + REG_MMU_PT_BASE_ADDR);
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -32,6 +32,7 @@ struct mtk_iommu_suspend_reg {
u32 ctrl_reg;
u32 int_control0;
u32 int_main_control;
+ u32 ivrp_paddr;
};

enum mtk_iommu_plat {