Re: [PATCH v4 10/18] iommu/mediatek: Add mt8183 IOMMU support

Matthias Brugger
2018-12-21T18:31:49Z

On 08/12/2018 09:39, Yong Wu wrote:
> The M4U IP blocks in mt8183 is MediaTek's generation2 M4U which use
> the ARM Short-descriptor like mt8173, and most of the HW registers
> are the same.
>
> Here list main differences between mt8183 and mt8173/mt2712:
> 1) mt8183 has only one M4U HW like mt8173 while mt2712 has two.
> 2) mt8183 don't have the "bclk" clock, it use the EMI clock instead.
> 3) mt8183 can support the dram over 4GB, but it doesn't call this "4GB
> mode".
> 4) mt8183 pgtable base register(0x0) extend bit[1:0] which represent
> the bit[33:32] in the physical address of the pgtable base, But the
> standard ttbr0[1] means the S bit which is enabled defaultly, Hence,
> we add a mask.
> 5) mt8183 HW has a GALS modules, SMI should enable "has_gals" support.
> 6) the larb-id in smi-common is remapped. M4U should enable
> larbid_remapped support.
>
> Signed-off-by: Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> ---
> drivers/iommu/mtk_iommu.c | 31 ++++++++++++++++++++++---------
> drivers/iommu/mtk_iommu.h | 1 +
> drivers/memory/mtk-smi.c | 19 +++++++++++++++++++
> 3 files changed, 42 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 8ab3b69..d91a554 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -36,6 +36,7 @@
> #include "mtk_iommu.h"
>
> #define REG_MMU_PT_BASE_ADDR 0x000
> +#define MMU_PT_ADDR_MASK GENMASK(31, 7)
>
> #define REG_MMU_INVALIDATE 0x020
> #define F_ALL_INVLD 0x2
> @@ -54,7 +55,7 @@
> #define REG_MMU_CTRL_REG 0x110
> #define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4)
> #define F_MMU_TF_PROTECT_SEL_SHIFT(data) \
> - ((data)->plat_data->m4u_plat == M4U_MT2712 ? 4 : 5)
> + ((data)->plat_data->m4u_plat == M4U_MT8173 ? 5 : 4)
> /* It's named by F_MMU_TF_PROT_SEL in mt2712. */
> #define F_MMU_TF_PROTECT_SEL(prot, data) \
> (((prot) & 0x3) << F_MMU_TF_PROTECT_SEL_SHIFT(data))
> @@ -347,7 +348,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
> /* Update the pgtable base address register of the M4U HW */
> if (!data->m4u_dom) {
> data->m4u_dom = dom;
> - writel(dom->cfg.arm_v7s_cfg.ttbr[0],
> + writel(dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
> data->base + REG_MMU_PT_BASE_ADDR);
> }
>
> @@ -510,6 +511,7 @@ static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
>
> static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
> {
> + enum mtk_iommu_plat m4u_plat = data->plat_data->m4u_plat;
> u32 regval;
> int ret;
>
> @@ -520,7 +522,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
> }
>
> regval = F_MMU_TF_PROTECT_SEL(2, data);
> - if (data->plat_data->m4u_plat == M4U_MT8173)
> + if (m4u_plat == M4U_MT8173)
> regval |= F_MMU_PREFETCH_RT_REPLACE_MOD;
> writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
>
> @@ -541,14 +543,14 @@ 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 (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->plat_data->m4u_plat != M4U_MT8173) {
> + if (data->enable_4GB && m4u_plat == M4U_MT2712) {
> /*
> * If 4GB mode is enabled, the validate PA range is from
> * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
> @@ -558,8 +560,11 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
> }
> writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
>
> - /* It's MISC control register whose default value is ok except mt8173.*/
> - if (data->plat_data->m4u_plat == M4U_MT8173)
> + /*
> + * It's MISC control register whose default value is ok
> + * except mt8173 and mt8183.
> + */
> + if (m4u_plat == M4U_MT8173 || m4u_plat == M4U_MT8183)
> writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
>
> if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
> @@ -713,6 +718,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
> {
> struct mtk_iommu_data *data = dev_get_drvdata(dev);
> struct mtk_iommu_suspend_reg *reg = &data->reg;
> + struct mtk_iommu_domain *m4u_dom = data->m4u_dom;
> void __iomem *base = data->base;
> int ret;
>
> @@ -728,8 +734,8 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
> writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
> writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
> writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR);
> - if (data->m4u_dom)
> - writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
> + if (m4u_dom)
> + writel(m4u_dom->cfg.arm_v7s_cfg.ttbr[0] & MMU_PT_ADDR_MASK,
> base + REG_MMU_PT_BASE_ADDR);
> return 0;
> }
> @@ -750,9 +756,16 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
> .has_bclk = true,
> };
>
> +static const struct mtk_iommu_plat_data mt8183_data = {
> + .m4u_plat = M4U_MT8183,
> + .larbid_remap_enable = true,
> + .larbid_remapped = {0, 4, 5, 6, 7, 2, 3, 1},

Aren't we reinventing the wheel here?
Why can't we use larb-id to get the correct id insteaf of providing another data
structure for the remapping?

Regards,
Matthias

> +};
> +
> static const struct of_device_id mtk_iommu_of_ids[] = {
> { .compatible = "mediatek,mt2712-m4u", .data = &mt2712_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 3877050..6385dec 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -39,6 +39,7 @@ enum mtk_iommu_plat {
> M4U_MT2701,
> M4U_MT2712,
> M4U_MT8173,
> + M4U_MT8183,
> };
>
> struct mtk_iommu_plat_data {
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 3720c77..bced778 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -285,6 +285,12 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
> .larb_special_mask = BIT(8) | BIT(9), /* bdpsys */
> };
>
> +static const struct mtk_smi_larb_gen mtk_smi_larb_mt8183 = {
> + .has_gals = true,
> + .config_port = mtk_smi_larb_config_port_gen2_general,
> + .larb_special_mask = BIT(2) | BIT(3) | BIT(7), /* IPU0 | IPU1 | CCU */
> +};
> +
> static const struct of_device_id mtk_smi_larb_of_ids[] = {
> {
> .compatible = "mediatek,mt8173-smi-larb",
> @@ -298,6 +304,10 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
> .compatible = "mediatek,mt2712-smi-larb",
> .data = &mtk_smi_larb_mt2712
> },
> + {
> + .compatible = "mediatek,mt8183-smi-larb",
> + .data = &mtk_smi_larb_mt8183
> + },
> {}
> };
>
> @@ -391,6 +401,11 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
> .gen = MTK_SMI_GEN2,
> };
>
> +static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
> + .gen = MTK_SMI_GEN2,
> + .has_gals = true,
> +};
> +
> static const struct of_device_id mtk_smi_common_of_ids[] = {
> {
> .compatible = "mediatek,mt8173-smi-common",
> @@ -404,6 +419,10 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
> .compatible = "mediatek,mt2712-smi-common",
> .data = &mtk_smi_common_gen2,
> },
> + {
> + .compatible = "mediatek,mt8183-smi-common",
> + .data = &mtk_smi_common_mt8183,
> + },
> {}
> };
>
>