On Tue, Feb 20, 2024 at 11:19:20AM -0500, Frank Li wrote:
> Add iMX95 PCIe Root Complex support.
>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
>
> Notes:
> Change from v8 to v9
> - Add mani's review tag
>
> Change from v7 to v8
> - Update commit subject
> - add const from regmap
> - remove unnessary logic in imx6_pcie_deassert_core_reset()
>
> Change from v4 to v7
> - none
> Change from v1 to v3
> - none
>
> drivers/pci/controller/dwc/pci-imx6.c | 82 +++++++++++++++++++++++++--
> 1 file changed, 77 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 71ce6b7ac1de0..582ba00d628a1 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -42,6 +42,25 @@
> #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
> #define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000
>
> +#define IMX95_PCIE_PHY_GEN_CTRL 0x0
> +#define IMX95_PCIE_REF_USE_PAD BIT(17)
> +
> +#define IMX95_PCIE_PHY_MPLLA_CTRL 0x10
> +#define IMX95_PCIE_PHY_MPLL_STATE BIT(30)
These two defines are unused, I will remove them.
> +#define IMX95_PCIE_SS_RW_REG_0 0xf0
> +#define IMX95_PCIE_REF_CLKEN BIT(23)
> +#define IMX95_PCIE_PHY_CR_PARA_SEL BIT(9)
> +
> +#define IMX95_PE0_GEN_CTRL_1 0x1050
> +#define IMX95_PCIE_DEVICE_TYPE GENMASK(3, 0)
> +
> +#define IMX95_PE0_GEN_CTRL_3 0x1058
> +#define IMX95_PCIE_LTSSM_EN BIT(0)
> +
> +#define IMX95_PE0_PM_STS 0x1064
> +#define IMX95_PCIE_PM_LINKST_IN_L2 BIT(14)
These two defines are unused. I will remove them.
> +
> #define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
>
> enum imx6_pcie_variants {
> @@ -52,6 +71,7 @@ enum imx6_pcie_variants {
> IMX8MQ,
> IMX8MM,
> IMX8MP,
> + IMX95,
> IMX8MQ_EP,
> IMX8MM_EP,
> IMX8MP_EP,
> @@ -63,6 +83,7 @@ enum imx6_pcie_variants {
> #define IMX6_PCIE_FLAG_HAS_PHYDRV BIT(3)
> #define IMX6_PCIE_FLAG_HAS_APP_RESET BIT(4)
> #define IMX6_PCIE_FLAG_HAS_PHY_RESET BIT(5)
> +#define IMX6_PCIE_FLAG_HAS_SERDES BIT(6)
>
> #define imx6_check_flag(pci, val) (pci->drvdata->flags & val)
>
> @@ -179,6 +200,24 @@ static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
> return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
> }
>
> +static int imx95_pcie_init_phy(struct imx6_pcie *imx6_pcie)
> +{
> + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> + IMX95_PCIE_SS_RW_REG_0,
> + IMX95_PCIE_PHY_CR_PARA_SEL,
> + IMX95_PCIE_PHY_CR_PARA_SEL);
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> + IMX95_PCIE_PHY_GEN_CTRL,
> + IMX95_PCIE_REF_USE_PAD, 0);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> + IMX95_PCIE_SS_RW_REG_0,
> + IMX95_PCIE_REF_CLKEN,
> + IMX95_PCIE_REF_CLKEN);
> +
> + return 0;
> +}
> +
> static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
> {
> const struct imx6_pcie_drvdata *drvdata = imx6_pcie->drvdata;
> @@ -575,6 +614,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> break;
> case IMX7D:
> + case IMX95:
> break;
> case IMX8MM:
> case IMX8MM_EP:
> @@ -1279,12 +1319,32 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> return PTR_ERR(imx6_pcie->turnoff_reset);
> }
>
> + if (imx6_pcie->drvdata->gpr) {
> /* Grab GPR config register range */
> - imx6_pcie->iomuxc_gpr =
> - syscon_regmap_lookup_by_compatible(imx6_pcie->drvdata->gpr);
> - if (IS_ERR(imx6_pcie->iomuxc_gpr)) {
> - dev_err(dev, "unable to find iomuxc registers\n");
> - return PTR_ERR(imx6_pcie->iomuxc_gpr);
> + imx6_pcie->iomuxc_gpr =
> + syscon_regmap_lookup_by_compatible(imx6_pcie->drvdata->gpr);
> + if (IS_ERR(imx6_pcie->iomuxc_gpr))
> + return dev_err_probe(dev, PTR_ERR(imx6_pcie->iomuxc_gpr),
> + "unable to find iomuxc registers\n");
> + }
> +
> + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_SERDES)) {
> + void __iomem *off = devm_platform_ioremap_resource_byname(pdev, "app");
> +
> + if (IS_ERR(off))
> + return dev_err_probe(dev, PTR_ERR(off),
> + "unable to find serdes registers\n");
> +
> + static const struct regmap_config regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + };
> +
> + imx6_pcie->iomuxc_gpr = devm_regmap_init_mmio(dev, off, ®map_config);
> + if (IS_ERR(imx6_pcie->iomuxc_gpr))
> + return dev_err_probe(dev, PTR_ERR(imx6_pcie->iomuxc_gpr),
> + "unable to find iomuxc registers\n");
> }
>
> /* Grab PCIe PHY Tx Settings */
> @@ -1457,6 +1517,17 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> .mode_off[0] = IOMUXC_GPR12,
> .mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
> },
> + [IMX95] = {
> + .variant = IMX95,
> + .flags = IMX6_PCIE_FLAG_HAS_SERDES,
> + .clk_names = imx8mq_clks,
> + .clks_cnt = ARRAY_SIZE(imx8mq_clks),
> + .ltssm_off = IMX95_PE0_GEN_CTRL_3,
> + .ltssm_mask = IMX95_PCIE_LTSSM_EN,
> + .mode_off[0] = IMX95_PE0_GEN_CTRL_1,
> + .mode_mask[0] = IMX95_PCIE_DEVICE_TYPE,
> + .init_phy = imx95_pcie_init_phy,
> + },
> [IMX8MQ_EP] = {
> .variant = IMX8MQ_EP,
> .flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> @@ -1501,6 +1572,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
> { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
> { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
> { .compatible = "fsl,imx8mp-pcie", .data = &drvdata[IMX8MP], },
> + { .compatible = "fsl,imx95-pcie", .data = &drvdata[IMX95], },
> { .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
> { .compatible = "fsl,imx8mm-pcie-ep", .data = &drvdata[IMX8MM_EP], },
> { .compatible = "fsl,imx8mp-pcie-ep", .data = &drvdata[IMX8MP_EP], },
> --
> 2.34.1
>
