Re: [PATCH v7 3/3] PCI: dwc: qcom: Add support for IPQ8074 PCIe controller

From: Stanimir Varbanov
Date: Thu Aug 17 2017 - 05:33:20 EST

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In reply to: Varadarajan Narayanan: "[PATCH v7 3/3] PCI: dwc: qcom: Add support for IPQ8074 PCIe controller"
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Hi Varada,

Thanks for the patch!

On 08/17/2017 10:43 AM, Varadarajan Narayanan wrote:
> Add support for the IPQ8074 PCIe controller. IPQ8074 supports
> Gen 1/2, one lane, two 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 similar to the existing SoC, however the
> clocks and reset lines differ.
>
> Signed-off-by: smuthayy <smuthayy@xxxxxxxxxxxxxx>
> Signed-off-by: Varadarajan Narayanan <varada@xxxxxxxxxxxxxx>
> ---
> drivers/pci/dwc/pcie-qcom.c | 233 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 233 insertions(+)
>
> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index c4cd039..5bfbbd3 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -37,6 +37,20 @@
> #include "pcie-designware.h"
>
> #define PCIE20_PARF_SYS_CTRL 0x00
> +#define MST_WAKEUP_EN BIT(13)
> +#define SLV_WAKEUP_EN BIT(12)
> +#define MSTR_ACLK_CGC_DIS BIT(10)
> +#define SLV_ACLK_CGC_DIS BIT(9)
> +#define CORE_CLK_CGC_DIS BIT(6)
> +#define AUX_PWR_DET BIT(4)
> +#define L23_CLK_RMV_DIS BIT(2)
> +#define L1_CLK_RMV_DIS BIT(1)
> +
> +#define PCIE20_COMMAND_STATUS 0x04
> +#define CMD_BME_VAL 0x4
> +#define PCIE20_DEVICE_CONTROL2_STATUS2 0x98
> +#define PCIE_CAP_CPL_TIMEOUT_DISABLE 0x10
> +
> #define PCIE20_PARF_PHY_CTRL 0x40
> #define PCIE20_PARF_PHY_REFCLK 0x4C
> #define PCIE20_PARF_DBI_BASE_ADDR 0x168
> @@ -58,9 +72,21 @@
> #define CFG_BRIDGE_SB_INIT BIT(0)
>
> #define PCIE20_CAP 0x70
> +#define PCIE20_CAP_LINK_CAPABILITIES (PCIE20_CAP + 0xc)
> +#define PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT (BIT(10) | BIT(11))
> +#define PCIE20_CAP_LINK_1 (PCIE20_CAP + 0x14)
> +#define PCIE_CAP_LINK1_VAL 0x2fd7f
> +
> +#define PCIE20_PARF_Q2A_FLUSH 0x1ac
> +
> +#define PCIE20_MISC_CONTROL_1_REG 0x8bc
> +#define DBI_RO_WR_EN 1
>
> #define PERST_DELAY_US 1000
>
> +#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
> +#define SLV_ADDR_SPACE_SZ 0x10000000
> +
> struct qcom_pcie_resources_2_1_0 {
> struct clk *iface_clk;
> struct clk *core_clk;
> @@ -110,11 +136,21 @@ struct qcom_pcie_resources_2_4_0 {
> struct reset_control *phy_ahb_reset;
> };
>
> +struct qcom_pcie_resources_2_3_3 {
> + struct clk *iface;
> + struct clk *axi_m_clk;
> + struct clk *axi_s_clk;
> + struct clk *ahb_clk;
> + struct clk *aux_clk;
> + struct reset_control *rst[7];
> +};
> +
> 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_4_0 v2_4_0;
> + struct qcom_pcie_resources_2_3_3 v2_3_3;

Could you add the struct v2_3_3 before v2_4_0 to keep the union sorted.

> };
>
> struct qcom_pcie;
> @@ -884,6 +920,194 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
> return ret;
> }
>
> +static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> + int i;
> + const char *rst_names[] = { "axi_m", "axi_s", "pipe",
> + "axi_m_sticky", "sticky",
> + "ahb", "sleep", };
> +
> + res->iface = devm_clk_get(dev, "iface");
> + if (IS_ERR(res->iface))
> + return PTR_ERR(res->iface);
> +
> + res->axi_m_clk = devm_clk_get(dev, "axi_m");
> + if (IS_ERR(res->axi_m_clk))
> + return PTR_ERR(res->axi_m_clk);
> +
> + res->axi_s_clk = devm_clk_get(dev, "axi_s");
> + if (IS_ERR(res->axi_s_clk))
> + return PTR_ERR(res->axi_s_clk);
> +
> + res->ahb_clk = devm_clk_get(dev, "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);
> +
> + for (i = 0; i < ARRAY_SIZE(rst_names); i++) {
> + res->rst[i] = devm_reset_control_get(dev, rst_names[i]);
> + if (IS_ERR(res->rst[i]))
> + return PTR_ERR(res->rst[i]);
> + }
> +
> + return 0;
> +}
> +
> +static void qcom_pcie_deinit_2_3_3(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
> +
> + clk_disable_unprepare(res->iface);
> + clk_disable_unprepare(res->axi_m_clk);
> + clk_disable_unprepare(res->axi_s_clk);
> + clk_disable_unprepare(res->ahb_clk);
> + clk_disable_unprepare(res->aux_clk);
> +}
> +
> +static int qcom_pcie_enable_resources_2_3_3(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> + int ret;
> +
> + ret = clk_prepare_enable(res->iface);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable core clock\n");
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(res->axi_m_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable core clock\n");
> + goto err_clk_axi_m;
> + }
> +
> + ret = clk_prepare_enable(res->axi_s_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable axi slave clock\n");
> + goto err_clk_axi_s;
> + }
> +
> + ret = clk_prepare_enable(res->ahb_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable ahb clock\n");
> + goto err_clk_ahb;
> + }
> +
> + ret = clk_prepare_enable(res->aux_clk);
> + if (ret) {
> + dev_err(dev, "cannot prepare/enable aux clock\n");
> + goto err_clk_aux;
> + }
> +
> + return 0;
> +
> +err_clk_aux:
> + clk_disable_unprepare(res->ahb_clk);
> +err_clk_ahb:
> + clk_disable_unprepare(res->axi_s_clk);
> +err_clk_axi_s:
> + clk_disable_unprepare(res->axi_m_clk);
> +err_clk_axi_m:
> + clk_disable_unprepare(res->iface);
> +
> + return ret;
> +}
> +
> +static int qcom_pcie_2_3_3_reset(struct qcom_pcie *pcie)
> +{
> + struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3;
> + int i, ret;
> +
> + for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
> + ret = reset_control_assert(res->rst[i]);
> + if (ret) {
> + dev_err(pcie->pci->dev,
> + "%s: reset assert failed for %d\n",
> + __func__, i);
> + return ret;
> + }
> + }
> +
> + msleep(2);

please use usleep_range, msleep(2) will not sleep 2ms but more, see
Documentation/timers/timers-howto.txt.

> +
> + for (i = 0; i < ARRAY_SIZE(res->rst); i++) {
> + ret = reset_control_deassert(res->rst[i]);
> + if (ret) {
> + dev_err(pcie->pci->dev,
> + "%s: reset deassert failed for %d\n",
> + __func__, i);
> + return ret;
> + }
> + }
> +
> + /*
> + * Don't have a way to see if the reset has completed.
> + * Wait for some time.
> + */

OK, I guess that this delay is not related to the resets but to the
resources which are enabled after assert/deassert but lets keep it.

> + msleep(2);

usleep_range

> +
> + return 0;
> +}
> +
> +static int qcom_pcie_init_2_3_3(struct qcom_pcie *pcie)
> +{
> + struct dw_pcie *pci = pcie->pci;
> + int ret;
> + u32 val;
> +
> + ret = qcom_pcie_2_3_3_reset(pcie);
Could you embed qcom_pcie_2_3_3_reset function body here to be
consistent with others qcom_pcie_init_xxx functions.

> + if (ret)
> + return ret;
> +
> + qcom_ep_reset_assert(pcie);

Why you reset endpoint here? We have qcom_pcie_host_init which will
assert/deassert reset signal, so I think you should delete this
qcom_ep_reset_assert invocation.

> +
> + ret = qcom_pcie_enable_resources_2_3_3(pcie);

Could you embed qcom_pcie_enable_resources_2_3_3 here for the same
reason as for qcom_pcie_2_3_3_reset, consistency with others SoCs.

> + if (ret)
> + return ret;
> +
> + writel(SLV_ADDR_SPACE_SZ, pcie->parf +
> + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);

Please put this like:

writel(SLV_ADDR_SPACE_SZ,
pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE);

> +
> + ret = phy_power_on(pcie->phy);

Do you really need to power_on the phy here? The qcom_pcie_host_init
will power_on the PHY for you, otherwise we call phy_power_on twice
which is weird.

> + if (ret) {
> + pcie->ops->deinit(pcie);

When you embed qcom_pcie_enable_resources_2_3_3 body here you have to
release resources on error path.

> + return ret;
> + }
> +
> + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
> + val &= ~BIT(0);
> + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
> +
> + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR);
> +
> + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS
> + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS |
> + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS,
> + pcie->parf + PCIE20_PARF_SYS_CTRL);
> + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH);
> +
> + writel(CMD_BME_VAL, pci->dbi_base + PCIE20_COMMAND_STATUS);
> + writel(DBI_RO_WR_EN, pci->dbi_base + PCIE20_MISC_CONTROL_1_REG);
> + writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + PCIE20_CAP_LINK_1);
> +
> + val = readl(pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
> + val &= ~PCIE20_CAP_ACTIVE_STATE_LINK_PM_SUPPORT;
> + writel(val, pci->dbi_base + PCIE20_CAP_LINK_CAPABILITIES);
> +
> + writel(PCIE_CAP_CPL_TIMEOUT_DISABLE, pci->dbi_base +
> + PCIE20_DEVICE_CONTROL2_STATUS2);
> +
> + return 0;
> +}
> +
> static int qcom_pcie_link_up(struct dw_pcie *pci)
> {
> u16 val = readw(pci->dbi_base + PCIE20_CAP + PCI_EXP_LNKSTA);
> @@ -985,6 +1209,14 @@ static int qcom_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> };
>
> +/* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */
> +static const struct qcom_pcie_ops ops_2_3_3 = {
> + .get_resources = qcom_pcie_get_resources_2_3_3,
> + .init = qcom_pcie_init_2_3_3,
> + .deinit = qcom_pcie_deinit_2_3_3,
> + .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> +};
> +
> static const struct dw_pcie_ops dw_pcie_ops = {
> .link_up = qcom_pcie_link_up,
> };
> @@ -1080,6 +1312,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> { .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
> { .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
> { .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
> + { .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
> { }
> };
>
>

regards,
Stan

Next message: Robin Murphy: "Re: [PATCH] irqchip/gic-{v2m, v3-its}: check iommu capable before doing iommu map"
Previous message: Boris Brezillon: "Re: [RFC 2/5] i3c: Add core I3C infrastructure"
In reply to: Varadarajan Narayanan: "[PATCH v7 3/3] PCI: dwc: qcom: Add support for IPQ8074 PCIe controller"
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