This patch adds support to msm8996/apq8096 pcie, MSM8996 supports Gen 1/2, One lane, 3 pcie root-complex with support to MSI and legacy interrupts and it conforms to PCI Express Base 2.1 specification.
This patch adds post_init callback to qcom_pcie_ops, as this is pcie pipe clocks and smmu configuration are only setup after the phy is powered on. It also adds ltssm_enable callback as it is very much different to other supported SOCs in the driver. Signed-off-by: Srinivas Kandagatla <[email protected]> --- I tested this patch along with phy driver patch on DB820c based on APQ8096 on port A and port B using sata and ethernet controllers. Thanks srini .../devicetree/bindings/pci/qcom,pcie.txt | 88 +++++++- drivers/pci/host/pcie-qcom.c | 237 ++++++++++++++++++++- 2 files changed, 318 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt index 4059a6f..1ddfcb4 100644 --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt @@ -92,6 +92,18 @@ - "aux" Auxiliary (AUX) clock - "bus_master" Master AXI clock - "bus_slave" Slave AXI clock + +- clock-names: + Usage: required for msm8996/apq8096 + Value type: <stringlist> + Definition: Should contain the following entries + - "aux" Auxiliary (AUX) clock + - "bus_master" Master AXI clock + - "bus_slave" Slave AXI clock + - "pipe" Pipe Clock driving internal logic. + - "cfg" Configuration clk. + - "snoc_axi" SNOC AXI clk + - "cnoc_ahb" CNOC AHB clk - resets: Usage: required Value type: <prop-encoded-array> @@ -114,8 +126,15 @@ Definition: Should contain the following entries - "core" Core reset +- iommus: + Usage: required for msm8996/apq8096 + Value type: <prop-encoded-array> + Definition: Should point to the respective IOMMU block with master port + as argument, see Documentation/devicetree/bindings/iommu/ + mediatek,iommu.txt for details. + - power-domains: - Usage: required for apq8084 + Usage: required for apq8084 and msm8996/apq8096 Value type: <prop-encoded-array> Definition: A phandle and power domain specifier pair to the power domain which is responsible for collapsing @@ -137,6 +156,11 @@ Definition: A phandle to the analog power supply for IC which generates reference clock +- vdda_1p8-supply: + Usage: required for msm8996/apq8096 + Value type: <phandle> + Definition: A phandle to the analog power supply for PCIE_1P8 + - phys: Usage: required for apq8084 Value type: <phandle> @@ -231,3 +255,65 @@ pinctrl-0 = <&pcie0_pins_default>; pinctrl-names = "default"; }; + +* Example for apq8096: + pcie1: qcom,pcie@00608000 { + compatible = "qcom,pcie-msm8996", "snps,dw-pcie"; + power-domains = <&gcc PCIE1_GDSC>; + bus-range = <0x00 0xff>; + num-lanes = <1>; + + status = "disabled"; + + reg = <0x00608000 0x2000>, + <0x0d000000 0xf1d>, + <0x0d000f20 0xa8>, + <0x0d100000 0x100000>; + + reg-names = "parf", "dbi", "elbi","config"; + + phys = <&pcie_phy 1>; + phy-names = "pciephy"; + + #address-cells = <3>; + #size-cells = <2>; + ranges = <0x01000000 0x0 0x0d200000 0x0d200000 0x0 0x100000>, + <0x02000000 0x0 0x0d300000 0x0d300000 0x0 0xd00000>; + + interrupts = <GIC_SPI 413 IRQ_TYPE_NONE>; + interrupt-names = "msi"; + #interrupt-cells = <1>; + interrupt-map-mask = <0 0 0 0x7>; + interrupt-map = <0 0 0 1 &intc 0 272 IRQ_TYPE_LEVEL_HIGH>, /* int_a */ + <0 0 0 2 &intc 0 273 IRQ_TYPE_LEVEL_HIGH>, /* int_b */ + <0 0 0 3 &intc 0 274 IRQ_TYPE_LEVEL_HIGH>, /* int_c */ + <0 0 0 4 &intc 0 275 IRQ_TYPE_LEVEL_HIGH>; /* int_d */ + + pinctrl-names = "default", "sleep"; + pinctrl-0 = <&pcie1_clkreq_default &pcie1_perst_default &pcie1_wake_default>; + pinctrl-1 = <&pcie1_clkreq_sleep &pcie1_perst_default &pcie1_wake_sleep>; + + + vreg-1.8-supply = <&pm8994_l12>; + vreg-0.9-supply = <&pm8994_l28>; + iommus = <&anoc0_smmu>; + + linux,pci-domain = <1>; + + clocks = <&gcc GCC_PCIE_1_PIPE_CLK>, + <&gcc GCC_PCIE_1_AUX_CLK>, + <&gcc GCC_PCIE_1_CFG_AHB_CLK>, + <&gcc GCC_PCIE_1_MSTR_AXI_CLK>, + <&gcc GCC_PCIE_1_SLV_AXI_CLK>, + <&gcc GCC_AGGRE0_SNOC_AXI_CLK>, + <&gcc GCC_AGGRE0_CNOC_AHB_CLK>; + + clock-names = "pipe", + "aux", + "cfg", + "bus_master", + "bus_slave", + "snoc_axi", + "cnoc_ahb"; + + }; diff --git a/drivers/pci/host/pcie-qcom.c b/drivers/pci/host/pcie-qcom.c index f2f90c5..7748c11 100644 --- a/drivers/pci/host/pcie-qcom.c +++ b/drivers/pci/host/pcie-qcom.c @@ -32,11 +32,19 @@ #include "pcie-designware.h" +#define PCIE20_PARF_DBI_BASE_ADDR 0x168 + +#define PCIE20_PARF_SYS_CTRL 0x00 #define PCIE20_PARF_PHY_CTRL 0x40 #define PCIE20_PARF_PHY_REFCLK 0x4C #define PCIE20_PARF_DBI_BASE_ADDR 0x168 #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16c +#define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 +#define MSM8996_PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x1A8 +#define PCIE20_PARF_LTSSM 0x1B0 +#define PCIE20_PARF_SID_OFFSET 0x234 +#define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C #define PCIE20_ELBI_SYS_CTRL 0x04 #define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0) @@ -68,9 +76,22 @@ struct qcom_pcie_resources_v1 { struct regulator *vdda; }; +struct qcom_pcie_resources_msm8996 { + struct clk *aux_clk; + struct clk *master_clk; + struct clk *slave_clk; + struct clk *cfg_clk; + struct clk *axi_clk; + struct clk *ahb_clk; + struct clk *pipe_clk; + struct regulator *vdda_1p8; + struct regulator *vdda; +}; + union qcom_pcie_resources { struct qcom_pcie_resources_v0 v0; struct qcom_pcie_resources_v1 v1; + struct qcom_pcie_resources_msm8996 msm8996; }; struct qcom_pcie; @@ -78,7 +99,9 @@ struct qcom_pcie; struct qcom_pcie_ops { int (*get_resources)(struct qcom_pcie *pcie); int (*init)(struct qcom_pcie *pcie); + int (*post_init)(struct qcom_pcie *pcie); void (*deinit)(struct qcom_pcie *pcie); + void (*ltssm_enable)(struct qcom_pcie *pcie); }; struct qcom_pcie { @@ -114,17 +137,33 @@ static irqreturn_t qcom_pcie_msi_irq_handler(int irq, void *arg) return dw_handle_msi_irq(pp); } -static int qcom_pcie_establish_link(struct qcom_pcie *pcie) +static void qcom_pcie_v0_v1_ltssm_enable(struct qcom_pcie *pcie) { u32 val; - - if (dw_pcie_link_up(&pcie->pp)) - return 0; - /* enable link training */ val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL); val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE; writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL); +} + +static void qcom_pcie_msm8996_ltssm_enable(struct qcom_pcie *pcie) +{ + u32 val; + /* enable link training */ + val = readl(pcie->parf + PCIE20_PARF_LTSSM); + val |= BIT(8); + writel(val, pcie->parf + PCIE20_PARF_LTSSM); +} + +static int qcom_pcie_establish_link(struct qcom_pcie *pcie) +{ + + if (dw_pcie_link_up(&pcie->pp)) + return 0; + + /* Enable Link Training state machine */ + if (pcie->ops->ltssm_enable) + pcie->ops->ltssm_enable(pcie); return dw_pcie_wait_for_link(&pcie->pp); } @@ -419,6 +458,164 @@ err_res: return ret; } +static int qcom_pcie_get_resources_msm8996(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_msm8996 *res = &pcie->res.msm8996; + struct device *dev = pcie->dev; + + res->vdda_1p8 = devm_regulator_get(dev, "vdda_1p8"); + if (IS_ERR(res->vdda_1p8)) + return PTR_ERR(res->vdda_1p8); + + res->vdda = devm_regulator_get(dev, "vdda"); + if (IS_ERR(res->vdda)) + return PTR_ERR(res->vdda); + + res->axi_clk = devm_clk_get(dev, "snoc_axi"); + if (IS_ERR(res->axi_clk)) + return PTR_ERR(res->axi_clk); + + res->ahb_clk = devm_clk_get(dev, "cnoc_ahb"); + if (IS_ERR(res->ahb_clk)) + return PTR_ERR(res->ahb_clk); + + res->aux_clk = devm_clk_get(dev, "aux"); + if (IS_ERR(res->aux_clk)) + return PTR_ERR(res->aux_clk); + + res->cfg_clk = devm_clk_get(dev, "cfg"); + if (IS_ERR(res->cfg_clk)) + return PTR_ERR(res->cfg_clk); + + res->master_clk = devm_clk_get(dev, "bus_master"); + if (IS_ERR(res->master_clk)) + return PTR_ERR(res->master_clk); + + res->slave_clk = devm_clk_get(dev, "bus_slave"); + if (IS_ERR(res->slave_clk)) + return PTR_ERR(res->slave_clk); + + res->pipe_clk = devm_clk_get(dev, "pipe"); + if (IS_ERR(res->pipe_clk)) + return PTR_ERR(res->pipe_clk); + + return 0; +} + +static int qcom_pcie_init_msm8996(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_msm8996 *res = &pcie->res.msm8996; + struct device *dev = pcie->dev; + u32 val; + int ret = 0; + + ret = regulator_enable(res->vdda_1p8); + if (ret) { + dev_err(dev, "cannot enable vdda_1p8 regulator\n"); + return ret; + } + + ret = regulator_enable(res->vdda); + if (ret) { + dev_err(dev, "cannot enable vdda regulator\n"); + goto err_vdda; + } + + ret = clk_prepare_enable(res->axi_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable axi clock\n"); + goto err_axi_clk; + } + + ret = clk_prepare_enable(res->ahb_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable ahb clock\n"); + goto err_ahb_clk; + } + + ret = clk_prepare_enable(res->aux_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable aux clock\n"); + goto err_aux_clk; + } + + ret = clk_prepare_enable(res->cfg_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable cfg clock\n"); + goto err_cfg_clk; + } + + ret = clk_prepare_enable(res->master_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable master clock\n"); + goto err_master_clk; + } + + ret = clk_prepare_enable(res->slave_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable slave clock\n"); + goto err_slave_clk; + } + + /* enable PCIe clocks and resets */ + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); + val &= ~BIT(0); + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); + + /* change DBI base address */ + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); + + /* MAC PHY_POWERDOWN MUX DISABLE */ + val = readl(pcie->parf + PCIE20_PARF_SYS_CTRL); + val &= ~BIT(29); + writel(val, pcie->parf + PCIE20_PARF_SYS_CTRL); + + val = readl(pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); + val |= BIT(4); + writel(val, pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); + + val = readl(pcie->parf + MSM8996_PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT); + val |= BIT(31); + writel(val, pcie->parf + MSM8996_PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT); + + return 0; + +err_slave_clk: + clk_disable_unprepare(res->master_clk); +err_master_clk: + clk_disable_unprepare(res->cfg_clk); +err_cfg_clk: + clk_disable_unprepare(res->aux_clk); +err_aux_clk: + clk_disable_unprepare(res->ahb_clk); +err_ahb_clk: + clk_disable_unprepare(res->axi_clk); +err_axi_clk: + regulator_disable(res->vdda); +err_vdda: + regulator_disable(res->vdda_1p8); + + return ret; +} + +static int qcom_pcie_post_init_msm8996(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_msm8996 *res = &pcie->res.msm8996; + struct device *dev = pcie->dev; + int ret; + + ret = clk_prepare_enable(res->pipe_clk); + if (ret) { + dev_err(dev, "cannot prepare/enable pipe clock\n"); + return ret; + } + /* SMMU specific registers */ + writel(0, pcie->parf + PCIE20_PARF_BDF_TRANSLATE_CFG); + writel(0, pcie->parf + PCIE20_PARF_SID_OFFSET); + + return 0; +} + static int qcom_pcie_link_up(struct pcie_port *pp) { struct qcom_pcie *pcie = to_qcom_pcie(pp); @@ -427,6 +624,21 @@ static int qcom_pcie_link_up(struct pcie_port *pp) return !!(val & PCI_EXP_LNKSTA_DLLLA); } +static void qcom_pcie_deinit_msm8996(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_msm8996 *res = &pcie->res.msm8996; + + clk_disable_unprepare(res->slave_clk); + clk_disable_unprepare(res->master_clk); + clk_disable_unprepare(res->cfg_clk); + clk_disable_unprepare(res->aux_clk); + clk_disable_unprepare(res->ahb_clk); + clk_disable_unprepare(res->axi_clk); + clk_disable_unprepare(res->pipe_clk); + regulator_disable(res->vdda); + regulator_disable(res->vdda_1p8); +} + static void qcom_pcie_host_init(struct pcie_port *pp) { struct qcom_pcie *pcie = to_qcom_pcie(pp); @@ -437,11 +649,13 @@ static void qcom_pcie_host_init(struct pcie_port *pp) ret = pcie->ops->init(pcie); if (ret) goto err_deinit; - ret = phy_power_on(pcie->phy); if (ret) goto err_deinit; + if (pcie->ops->post_init) + pcie->ops->post_init(pcie); + dw_pcie_setup_rc(pp); if (IS_ENABLED(CONFIG_PCI_MSI)) @@ -485,12 +699,22 @@ static const struct qcom_pcie_ops ops_v0 = { .get_resources = qcom_pcie_get_resources_v0, .init = qcom_pcie_init_v0, .deinit = qcom_pcie_deinit_v0, + .ltssm_enable = qcom_pcie_v0_v1_ltssm_enable, }; static const struct qcom_pcie_ops ops_v1 = { .get_resources = qcom_pcie_get_resources_v1, .init = qcom_pcie_init_v1, .deinit = qcom_pcie_deinit_v1, + .ltssm_enable = qcom_pcie_v0_v1_ltssm_enable, +}; + +static const struct qcom_pcie_ops ops_msm8996 = { + .get_resources = qcom_pcie_get_resources_msm8996, + .init = qcom_pcie_init_msm8996, + .post_init = qcom_pcie_post_init_msm8996, + .deinit = qcom_pcie_deinit_msm8996, + .ltssm_enable = qcom_pcie_msm8996_ltssm_enable, }; static int qcom_pcie_probe(struct platform_device *pdev) @@ -586,6 +810,7 @@ static const struct of_device_id qcom_pcie_match[] = { { .compatible = "qcom,pcie-ipq8064", .data = &ops_v0 }, { .compatible = "qcom,pcie-apq8064", .data = &ops_v0 }, { .compatible = "qcom,pcie-apq8084", .data = &ops_v1 }, + { .compatible = "qcom,pcie-msm8996", .data = &ops_msm8996 }, { } }; MODULE_DEVICE_TABLE(of, qcom_pcie_match); -- 2.7.4
