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Message-ID: <CAA8EJpoqq=3o1K=yDaim=e11nEN5n+phJUSd1d5BT_VJkdv6xg@mail.gmail.com>
Date: Sat, 22 Apr 2023 03:05:44 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Devi Priya <quic_devipriy@...cinc.com>
Cc: agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
bhelgaas@...gle.com, krzysztof.kozlowski+dt@...aro.org,
mturquette@...libre.com, sboyd@...nel.org, mani@...nel.org,
linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-clk@...r.kernel.org, quic_srichara@...cinc.com,
quic_sjaganat@...cinc.com, quic_kathirav@...cinc.com,
quic_arajkuma@...cinc.com, quic_anusha@...cinc.com,
quic_ipkumar@...cinc.com
Subject: Re: [PATCH V3 6/6] PCI: qcom: Add support for IPQ9574
On Fri, 21 Apr 2023 at 15:51, Devi Priya <quic_devipriy@...cinc.com> wrote:
>
> The IPQ9574 platform has 4 Gen3 PCIe controllers: two single-lane
> and two dual-lane based on SNPS core 5.70a
> The Qcom IP rev is 1.27.0 and Synopsys IP rev is 5.80a
> Added a new compatible 'qcom,pcie-ipq9574' and 'ops_1_27_0'
> which reuses all the members of 'ops_2_9_0' except for the post_init
> as the SLV_ADDR_SPACE_SIZE configuration differs between 2_9_0
> and 1_27_0.
> Also, modified get_resources of 'ops 2_9_0' to get the clocks
> from the device tree and modelled the post init sequence as
> a common function to avoid code redundancy.
>
> Co-developed-by: Anusha Rao <quic_anusha@...cinc.com>
> Signed-off-by: Anusha Rao <quic_anusha@...cinc.com>
> Signed-off-by: Devi Priya <quic_devipriy@...cinc.com>
> ---
> Changes in V3:
> - Rebased on top of linux-next/master
>
> drivers/pci/controller/dwc/pcie-qcom.c | 61 ++++++++++++++++++--------
> 1 file changed, 43 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 4ab30892f6ef..3682ecdead1f 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -107,6 +107,7 @@
>
> /* PARF_SLV_ADDR_SPACE_SIZE register value */
> #define SLV_ADDR_SPACE_SZ 0x10000000
> +#define SLV_ADDR_SPACE_SZ_1_27_0 0x08000000
>
> /* PARF_MHI_CLOCK_RESET_CTRL register fields */
> #define AHB_CLK_EN BIT(0)
> @@ -202,10 +203,10 @@ struct qcom_pcie_resources_2_7_0 {
> struct reset_control *rst;
> };
>
> -#define QCOM_PCIE_2_9_0_MAX_CLOCKS 5
> struct qcom_pcie_resources_2_9_0 {
> - struct clk_bulk_data clks[QCOM_PCIE_2_9_0_MAX_CLOCKS];
> + struct clk_bulk_data *clks;
> struct reset_control *rst;
> + int num_clks;
> };
>
> union qcom_pcie_resources {
> @@ -1050,17 +1051,10 @@ static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
> struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
> struct dw_pcie *pci = pcie->pci;
> struct device *dev = pci->dev;
> - int ret;
>
> - res->clks[0].id = "iface";
> - res->clks[1].id = "axi_m";
> - res->clks[2].id = "axi_s";
> - res->clks[3].id = "axi_bridge";
> - res->clks[4].id = "rchng";
> -
> - ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
> - if (ret < 0)
> - return ret;
> + res->num_clks = devm_clk_bulk_get_all(dev, &res->clks);
> + if (res->clks < 0)
> + return res->num_clks;
>
> res->rst = devm_reset_control_array_get_exclusive(dev);
> if (IS_ERR(res->rst))
> @@ -1073,7 +1067,7 @@ static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie)
> {
> struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
>
> - clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
> + clk_bulk_disable_unprepare(res->num_clks, res->clks);
> }
>
> static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
> @@ -1102,19 +1096,16 @@ static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
>
> usleep_range(2000, 2500);
>
> - return clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
> + return clk_bulk_prepare_enable(res->num_clks, res->clks);
> }
>
> -static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
> +static int qcom_pcie_post_init(struct qcom_pcie *pcie)
> {
> struct dw_pcie *pci = pcie->pci;
> u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
> u32 val;
> int i;
>
> - writel(SLV_ADDR_SPACE_SZ,
> - pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
> -
> val = readl(pcie->parf + PARF_PHY_CTRL);
> val &= ~PHY_TEST_PWR_DOWN;
> writel(val, pcie->parf + PARF_PHY_CTRL);
> @@ -1151,6 +1142,26 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
> return 0;
> }
>
> +static int qcom_pcie_post_init_1_27_0(struct qcom_pcie *pcie)
> +{
> + writel(SLV_ADDR_SPACE_SZ_1_27_0,
> + pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
> +
> + qcom_pcie_post_init(pcie);
> +
> + return 0;
> +}
> +
> +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
> +{
> + writel(SLV_ADDR_SPACE_SZ,
> + pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
> +
> + qcom_pcie_post_init(pcie);
> +
> + return 0;
> +}
I'm not sure about moving the SLV_ADDR_SPACE_SIZE initialization from
init() to post_init(). Probably a better solution might be to have two
init() callbacks and to call the common function from both of them.
> +
> static int qcom_pcie_link_up(struct dw_pcie *pci)
> {
> u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
> @@ -1291,6 +1302,15 @@ static const struct qcom_pcie_ops ops_2_9_0 = {
> .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> };
>
> +/* Qcom IP rev.: 1.27.0 Synopsys IP rev.: 5.80a */
> +static const struct qcom_pcie_ops ops_1_27_0 = {
> + .get_resources = qcom_pcie_get_resources_2_9_0,
> + .init = qcom_pcie_init_2_9_0,
> + .post_init = qcom_pcie_post_init_1_27_0,
> + .deinit = qcom_pcie_deinit_2_9_0,
> + .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> +};
> +
> static const struct qcom_pcie_cfg cfg_1_0_0 = {
> .ops = &ops_1_0_0,
> };
> @@ -1323,6 +1343,10 @@ static const struct qcom_pcie_cfg cfg_2_9_0 = {
> .ops = &ops_2_9_0,
> };
>
> +static const struct qcom_pcie_cfg cfg_1_27_0 = {
> + .ops = &ops_1_27_0,
> +};
> +
> static const struct dw_pcie_ops dw_pcie_ops = {
> .link_up = qcom_pcie_link_up,
> .start_link = qcom_pcie_start_link,
> @@ -1607,6 +1631,7 @@ static const struct of_device_id qcom_pcie_match[] = {
> { .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
> { .compatible = "qcom,pcie-ipq8074", .data = &cfg_2_3_3 },
> { .compatible = "qcom,pcie-ipq8074-gen3", .data = &cfg_2_9_0 },
> + { .compatible = "qcom,pcie-ipq9574", .data = &cfg_1_27_0 },
> { .compatible = "qcom,pcie-msm8996", .data = &cfg_2_3_2 },
> { .compatible = "qcom,pcie-qcs404", .data = &cfg_2_4_0 },
> { .compatible = "qcom,pcie-sa8540p", .data = &cfg_1_9_0 },
> --
> 2.17.1
>
--
With best wishes
Dmitry
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