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Message-ID: <e8a05fdd-2ca5-9f1c-6137-40df491ab310@mm-sol.com>
Date: Fri, 1 Mar 2019 14:53:33 +0200
From: Stanimir Varbanov <svarbanov@...sol.com>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pcie: qcom: Add support for sdm845 PCIe controller
Hi Bjorn,
Thanks for the patch!
On 2/26/19 9:01 AM, Bjorn Andersson wrote:
> The SDM845 has one Gen2 and one Gen3 controller, add support for these.
>
> Due to lack of hardware only the Gen2 controller has been verified.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> .../devicetree/bindings/pci/qcom,pcie.txt | 19 +++
> drivers/pci/controller/dwc/pcie-qcom.c | 146 ++++++++++++++++++
> 2 files changed, 165 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> index 1fd703bd73e0..2cf92ed39499 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> @@ -10,6 +10,7 @@
> - "qcom,pcie-msm8996" for msm8996 or apq8096
> - "qcom,pcie-ipq4019" for ipq4019
> - "qcom,pcie-ipq8074" for ipq8074
> + - "qcom,pcie-sdm845" for sdm845
>
> - reg:
> Usage: required
> @@ -116,6 +117,18 @@
> - "ahb" AHB clock
> - "aux" Auxiliary clock
>
> +- clock-names:
> + Usage: required for sdm845
> + Value type: <stringlist>
> + Definition: Should contain the following entries
> + - "aux" Auxiliary clock
> + - "cfg" Configuration clock
> + - "bus_master" Master AXI clock
> + - "bus_slave" Slave AXI clock
> + - "slave_q2a" Slave Q2A clock
What means Q2A? It'd be nice to describe it.
> + - "tbu" PCIe TBU clock
Is TBU related to SMMU or to something else?
> + - "pipe" PIPE clock
> +
> - resets:
> Usage: required
> Value type: <prop-encoded-array>
> @@ -167,6 +180,12 @@
> - "ahb" AHB Reset
> - "axi_m_sticky" AXI Master Sticky reset
>
> +- reset-names:
> + Usage: required for sdm845
> + Value type: <stringlist>
> + Definition: Should contain the following entries
> + - "pci" PCIe core reset
> +
> - power-domains:
> Usage: required for apq8084 and msm8996/apq8096
> Value type: <prop-encoded-array>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index d185ea5fe996..5147454a6ae5 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -54,6 +54,7 @@
> #define PCIE20_PARF_LTSSM 0x1B0
> #define PCIE20_PARF_SID_OFFSET 0x234
> #define PCIE20_PARF_BDF_TRANSLATE_CFG 0x24C
> +#define PCIE20_PARF_DEVICE_TYPE 0x1000
>
> #define PCIE20_ELBI_SYS_CTRL 0x04
> #define PCIE20_ELBI_SYS_CTRL_LT_ENABLE BIT(0)
> @@ -80,6 +81,8 @@
> #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
> #define SLV_ADDR_SPACE_SZ 0x10000000
>
> +#define DEVICE_TYPE_RC 0x4
> +
> #define QCOM_PCIE_2_1_0_MAX_SUPPLY 3
> struct qcom_pcie_resources_2_1_0 {
> struct clk *iface_clk;
> @@ -139,12 +142,21 @@ struct qcom_pcie_resources_2_3_3 {
> struct reset_control *rst[7];
> };
>
> +struct qcom_pcie_resources_2_7_0 {
> + struct clk_bulk_data clks[6];
> + struct regulator_bulk_data supplies[2];
> +
please drop the blank line.
> + struct reset_control *pci_reset;
> + struct clk *pipe_clk;
> +};
> +
> union qcom_pcie_resources {
> struct qcom_pcie_resources_1_0_0 v1_0_0;
> struct qcom_pcie_resources_2_1_0 v2_1_0;
> struct qcom_pcie_resources_2_3_2 v2_3_2;
> struct qcom_pcie_resources_2_3_3 v2_3_3;
> struct qcom_pcie_resources_2_4_0 v2_4_0;
> + struct qcom_pcie_resources_2_7_0 v2_7_0;
> };
>
> struct qcom_pcie;
> @@ -1076,6 +1088,129 @@ static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
> return ret;
> }
>
> +static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> + int ret;
> +
> + res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
> + if (IS_ERR(res->pci_reset))
> + return PTR_ERR(res->pci_reset);
> +
> + res->supplies[0].supply = "vdda";
> + res->supplies[1].supply = "vddpe-3v3";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
> + res->supplies);
> + if (ret)
> + return ret;
> +
> + res->clks[0].id = "aux";
> + res->clks[1].id = "cfg";
> + res->clks[2].id = "bus_master";
> + res->clks[3].id = "bus_slave";
> + res->clks[4].id = "slave_q2a";
> + res->clks[5].id = "tbu";
> +
> + ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
> + if (ret < 0)
> + return ret;
> +
> + res->pipe_clk = devm_clk_get(dev, "pipe");
> + return PTR_ERR_OR_ZERO(res->pipe_clk);
> +}
> +
> +static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> + u32 val;
> + int ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
> + if (ret < 0) {
> + dev_err(dev, "cannot enable regulators\n");
> + return ret;
> + }
> +
> + ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
> + if (ret < 0)
you could add dev_err() as well (to be aligned with
regulator_bulk_enable and reset_control_assert).
> + goto err_disable_regulators;
> +
> + ret = reset_control_assert(res->pci_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert pci reset\n");
> + return ret;
> + }
> +
> + msleep(10);
for sleeping interval 10us - 20ms you should use usleep_range, please
fix it.
> +
> + ret = reset_control_deassert(res->pci_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert pci reset\n");
> + return ret;
> + }
> +
> + clk_prepare_enable(res->pipe_clk);
check for errors, please.
> +
> + /* configure PCIe to RC mode */
> + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE);
> +
> + /* 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);
> +
> + if (IS_ENABLED(CONFIG_PCI_MSI)) {
> + val = readl(pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
> + val |= BIT(31);
> + writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT);
> + }
> +
> + return 0;
> +
> +err_disable_regulators:
> + regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
> +
> + return ret;
> +}
> +
<cut>
--
regards,
Stan
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