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Fri, 19 Jan 2024 17:12:44 +0000 From: Frank Li To: manivannan.sadhasivam@linaro.org Cc: Frank.Li@nxp.com, bhelgaas@google.com, conor+dt@kernel.org, devicetree@vger.kernel.org, festevam@gmail.com, helgaas@kernel.org, hongxing.zhu@nxp.com, imx@lists.linux.dev, kernel@pengutronix.de, krzysztof.kozlowski+dt@linaro.org, krzysztof.kozlowski@linaro.org, kw@linux.com, l.stach@pengutronix.de, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, lpieralisi@kernel.org, robh@kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org Subject: [PATCH v9 12/16] PCI: imx6: Add iMX95 PCIe Root Complex support Date: Fri, 19 Jan 2024 12:11:18 -0500 Message-Id: <20240119171122.3057511-13-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240119171122.3057511-1-Frank.Li@nxp.com> References: <20240119171122.3057511-1-Frank.Li@nxp.com> X-ClientProxiedBy: BY5PR20CA0023.namprd20.prod.outlook.com (2603:10b6:a03:1f4::36) To PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9642:EE_|PA4PR04MB9688:EE_ X-MS-Office365-Filtering-Correlation-Id: 31df8c08-684b-4160-4c91-08dc1911da0b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Reviewed-by: Manivannan Sadhasivam Signed-off-by: Frank Li --- 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 dad192f38e702..1cfa5f14f18f3 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -42,6 +42,25 @@ #define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12) #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8) +#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) + +#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) + #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: @@ -1280,12 +1320,32 @@ 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 */ @@ -1458,6 +1518,17 @@ 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 | @@ -1502,6 +1573,7 @@ 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], },