linux-kernel - Re: [PATCH v2 2/2] iommu: mtk_iommu: Add support for MT6795 Helio X10 M4Us

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Date:   Thu, 26 May 2022 16:18:26 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     <joro@...tes.org>, <will@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <konrad.dybcio@...ainline.org>, <marijn.suijten@...ainline.org>,
        <martin.botka@...ainline.org>,
        <~postmarketos/upstreaming@...ts.sr.ht>,
        <phone-devel@...r.kernel.org>, <paul.bouchara@...ainline.org>
Subject: Re: [PATCH v2 2/2] iommu: mtk_iommu: Add support for MT6795 Helio
 X10 M4Us

On Wed, 2022-05-18 at 12:18 +0200, AngeloGioacchino Del Regno wrote:
> Add support for the M4Us found in the MT6795 Helio X10 SoC.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
>  drivers/iommu/mtk_iommu.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 090cf6e15f85..97ff30ed2d0f 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -159,6 +159,7 @@
>  enum mtk_iommu_plat {
>  	M4U_MT2712,
>  	M4U_MT6779,
> +	M4U_MT6795,
>  	M4U_MT8167,
>  	M4U_MT8173,
>  	M4U_MT8183,
> @@ -954,7 +955,8 @@ static int mtk_iommu_hw_init(const struct
> mtk_iommu_data *data, unsigned int ban
>  	 * Global control settings are in bank0. May re-init these
> global registers
>  	 * since no sure if there is bank0 consumers.
>  	 */
> -	if (data->plat_data->m4u_plat == M4U_MT8173) {
> +	if (data->plat_data->m4u_plat == M4U_MT6795 ||
> +	    data->plat_data->m4u_plat == M4U_MT8173) {

Add a new flag for this. This setting difference is that the offset for
TF_PROT_TO_PROGRAM_ADDR is 5 in mt8173 while the others' offset is 4.
thus, we could rename the flag like TF_PORT_TO_ADDR_MT8173 or
TF_PORT_TO_ADDR_OFFSET_IS_5.

>  		regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
>  			 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
>  	} else {
> @@ -1422,6 +1424,18 @@ static const struct mtk_iommu_plat_data
> mt6779_data = {
>  	.larbid_remap  = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
>  };
>  
> +static const struct mtk_iommu_plat_data mt6795_data = {
> +	.m4u_plat     = M4U_MT6795,
> +	.flags	      = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
> +			HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM,
> +	.inv_sel_reg  = REG_MMU_INV_SEL_GEN1,
> +	.banks_num    = 1,
> +	.banks_enable = {true},
> +	.iova_region  = single_domain,
> +	.iova_region_nr = ARRAY_SIZE(single_domain),
> +	.larbid_remap = {{0}, {1}, {2}, {3}, {4}}, /* Linear mapping.
> */
> +};
> +
>  static const struct mtk_iommu_plat_data mt8167_data = {
>  	.m4u_plat     = M4U_MT8167,
>  	.flags        = RESET_AXI | HAS_LEGACY_IVRP_PADDR |
> MTK_IOMMU_TYPE_MM,
> @@ -1533,6 +1547,7 @@ static const struct mtk_iommu_plat_data
> mt8195_data_vpp = {
>  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,mt6795-m4u", .data = &mt6795_data},
>  	{ .compatible = "mediatek,mt8167-m4u", .data = &mt8167_data},
>  	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
>  	{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},