On Fri, May 05, 2017 at 05:25:24PM +0200, John Crispin wrote:
> Add support for the IPQ4019 PCIe controller. IPQ4019 supports Gen
> 1/2, one lane, one PCIe root complex with support for MSI and legacy
> interrupts, and it conforms to PCI Express Base 2.1 specification.
>
> The core init is the sames as for the MSM8996, however the clocks and
> reset lines differ.
>
> Signed-off-by: John Crispin <john@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/pci/qcom,pcie.txt | 20 +-
For the binding:
Acked-by: Rob Herring <robh@xxxxxxxxxx>
> drivers/pci/host/pcie-qcom.c | 304 +++++++++++++++++++++
> 2 files changed, 323 insertions(+), 1 deletion(-)
> +static int qcom_pcie_init_v3(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_v3 *res = &pcie->res.v3;
> + struct device *dev = pcie->pp.dev;
> + u32 val;
> + int ret;
> +
> + ret = reset_control_assert(res->axi_m_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert axi master reset\n");
These all seem kind of verbose. Perhaps the error message should be in
reset_control_assert function.
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->axi_s_reset);
> + if (ret) {
> + dev_err(dev, "cannot asser axi slave reset\n");
> + return ret;
> + }
> +
> + usleep_range(10000, 12000);
> +
> + ret = reset_control_assert(res->pipe_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert pipe reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->pipe_sticky_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert pipe sticky reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->phy_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert phy reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->phy_ahb_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert phy ahb reset\n");
> + return ret;
> + }
> +
> + usleep_range(10000, 12000);
> +
> + ret = reset_control_assert(res->axi_m_sticky_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert axi master sticky reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->pwr_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert power reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_assert(res->ahb_reset);
> + if (ret) {
> + dev_err(dev, "cannot assert ahb reset\n");
> + return ret;
> + }
> +
> + usleep_range(10000, 12000);
> +
> + ret = reset_control_deassert(res->phy_ahb_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert phy ahb reset\n");
> + return ret;
> + }
> +
> + ret = reset_control_deassert(res->phy_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert phy reset\n");
> + goto err_rst_phy;
> + }
> +
> + ret = reset_control_deassert(res->pipe_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert pipe reset\n");
> + goto err_rst_pipe;
> + }
> +
> + ret = reset_control_deassert(res->pipe_sticky_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert pipe sticky reset\n");
> + goto err_rst_pipe_sticky;
> + }
> +
> + usleep_range(10000, 12000);
> +
> + ret = reset_control_deassert(res->axi_m_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert axi master reset\n");
> + goto err_rst_axi_m;
> + }
> +
> + ret = reset_control_deassert(res->axi_m_sticky_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert axi master sticky reset\n");
> + goto err_rst_axi_m_sticky;
> + }
> +
> + ret = reset_control_deassert(res->axi_s_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert axi slave reset\n");
> + goto err_rst_axi_s;
> + }
> +
> + ret = reset_control_deassert(res->pwr_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert power reset\n");
> + goto err_rst_pwr;
> + }
> +
> + ret = reset_control_deassert(res->ahb_reset);
> + if (ret) {
> + dev_err(dev, "cannot deassert ahb reset\n");
> + goto err_rst_ahb;
> + }
> +
> + usleep_range(10000, 12000);
> +
> + ret = clk_prepare_enable(res->aux_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable iface clock\n");
> + goto err_clk_aux;
> + }
> +
> + ret = clk_prepare_enable(res->master_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable core clock\n");
> + goto err_clk_axi_m;
> + }
> +
> + ret = clk_prepare_enable(res->slave_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable phy clock\n");
> + goto err_clk_axi_s;
> + }
> +
> + /* 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 + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
> + val |= BIT(31);
> + writel(val, pcie->parf + PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2);
> +
> + return 0;
> +
> +err_clk_axi_s:
> + clk_disable_unprepare(res->master_clk);
> +err_clk_axi_m:
> + clk_disable_unprepare(res->aux_clk);
In deinit you turn off the clocks last.
> +err_clk_aux:
> + reset_control_assert(res->ahb_reset);
> +err_rst_ahb:
> + reset_control_assert(res->pwr_reset);
> +err_rst_pwr:
> + reset_control_assert(res->axi_s_reset);
> +err_rst_axi_s:
> + reset_control_assert(res->axi_m_sticky_reset);
> +err_rst_axi_m_sticky:
> + reset_control_assert(res->axi_m_reset);
> +err_rst_axi_m:
> + reset_control_assert(res->pipe_sticky_reset);
> +err_rst_pipe_sticky:
> + reset_control_assert(res->pipe_reset);
> +err_rst_pipe:
> + reset_control_assert(res->phy_reset);
> +err_rst_phy:
> + reset_control_assert(res->phy_ahb_reset);
> + return ret;
> +}
> +
> static int qcom_pcie_link_up(struct pcie_port *pp)
> {
> struct qcom_pcie *pcie = to_qcom_pcie(pp);
> @@ -661,6 +957,13 @@ static const struct qcom_pcie_ops ops_v2 = {
> .ltssm_enable = qcom_pcie_v2_ltssm_enable,
> };
>
> +static const struct qcom_pcie_ops ops_v3 = {
> + .get_resources = qcom_pcie_get_resources_v3,
> + .init = qcom_pcie_init_v3,
> + .deinit = qcom_pcie_deinit_v3,
> + .ltssm_enable = qcom_pcie_v2_ltssm_enable,
> +};
> +
> static int qcom_pcie_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -739,6 +1042,7 @@ static const struct of_device_id qcom_pcie_match[] = {
> { .compatible = "qcom,pcie-apq8064", .data = &ops_v0 },
> { .compatible = "qcom,pcie-apq8084", .data = &ops_v1 },
> { .compatible = "qcom,pcie-msm8996", .data = &ops_v2 },
> + { .compatible = "qcom,pcie-ipq4019", .data = &ops_v3 },
> { }
> };
>
> --
> 2.11.0
>
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