On 06-02-25, 17:47, Varadarajan Narayanan wrote:
> From: Nitheesh Sekar <quic_nsekar@xxxxxxxxxxx>
>
> Add Qualcomm PCIe UNIPHY 28LP driver support present in Qualcomm IPQ5332
> SoC and the phy init sequence.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Signed-off-by: Nitheesh Sekar <quic_nsekar@xxxxxxxxxxx>
> Signed-off-by: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
> ---
> v9: Align with dt-bindings and make num-lanes mandatory. Return error if not
> present
> Add new line before return in one of the functions
>
> v6: Use generally followed pattern for getting num-lanes from DT
>
> v5: * Use 'num-lanes' to differentiate instead of '3x1' or '3x2'
> in compatible string
> * Drop compatible specific init data as there is only one
> compatible string
> * Fix header file order
>
> v4: Fix uppercase hex digit
> Use phy->id for pipe clock source
>
> v3: Added 'Reviewed-by: Dmitry Baryshkov' and made following updates
> s/unsigned int/u32/g
> Fix 'lane_offset' comments
> Fix #define tab -> space
> Fix mixed case hex numbers
> Fix licensing & owner
> Change for-loop pointer to use [] instead of ->
> Use 'less than max' instead of 'not equal to max' in termination condition
> Smatch and Coccinelle passed
>
> v2: Drop IPQ5018 related code and data
> Use uniform prefix for struct names
> Place "}, {", on the same line
> In qcom_uniphy_pcie_init(), use for-loop instead of while
> Swap reset and clock disable order in qcom_uniphy_pcie_power_off
> Add reset assert to qcom_uniphy_pcie_power_on's error path
> Use macros for usleep duration
> Inlined qcom_uniphy_pcie_get_resources & use devm_platform_get_and_ioremap_resource
> Drop 'clock-output-names' from phy_pipe_clk_register
> ---
> drivers/phy/qualcomm/Kconfig | 12 +
> drivers/phy/qualcomm/Makefile | 1 +
> .../phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c | 287 ++++++++++++++++++
> 3 files changed, 300 insertions(+)
> create mode 100644 drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c
>
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index 846f8c99547f..a6b71fda1b9c 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -154,6 +154,18 @@ config PHY_QCOM_M31_USB
> management. This driver is required even for peripheral only or
> host only mode configurations.
>
> +config PHY_QCOM_UNIPHY_PCIE_28LP
> + bool "PCIE UNIPHY 28LP PHY driver"
> + depends on ARCH_QCOM
> + depends on HAS_IOMEM
> + depends on OF
> + select GENERIC_PHY
> + help
> + Enable this to support the PCIe UNIPHY 28LP phy transceiver that
> + is used with PCIe controllers on Qualcomm IPQ5332 chips. It
> + handles PHY initialization, clock management required after
> + resetting the hardware and power management.
> +
> config PHY_QCOM_USB_HS
> tristate "Qualcomm USB HS PHY module"
> depends on USB_ULPI_BUS
> diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
> index eb60e950ad53..42038bc30974 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_PHY_QCOM_QMP_USB_LEGACY) += phy-qcom-qmp-usb-legacy.o
> obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o
> obj-$(CONFIG_PHY_QCOM_SNPS_EUSB2) += phy-qcom-snps-eusb2.o
> obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER) += phy-qcom-eusb2-repeater.o
> +obj-$(CONFIG_PHY_QCOM_UNIPHY_PCIE_28LP) += phy-qcom-uniphy-pcie-28lp.o
> obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o
> obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o
> obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o
> diff --git a/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c
> new file mode 100644
> index 000000000000..311f98181177
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c
> @@ -0,0 +1,287 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2025, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#define RST_ASSERT_DELAY_MIN_US 100
> +#define RST_ASSERT_DELAY_MAX_US 150
> +#define PIPE_CLK_DELAY_MIN_US 5000
> +#define PIPE_CLK_DELAY_MAX_US 5100
> +#define CLK_EN_DELAY_MIN_US 30
> +#define CLK_EN_DELAY_MAX_US 50
> +#define CDR_CTRL_REG_1 0x80
> +#define CDR_CTRL_REG_2 0x84
> +#define CDR_CTRL_REG_3 0x88
> +#define CDR_CTRL_REG_4 0x8c
> +#define CDR_CTRL_REG_5 0x90
> +#define CDR_CTRL_REG_6 0x94
> +#define CDR_CTRL_REG_7 0x98
> +#define SSCG_CTRL_REG_1 0x9c
> +#define SSCG_CTRL_REG_2 0xa0
> +#define SSCG_CTRL_REG_3 0xa4
> +#define SSCG_CTRL_REG_4 0xa8
> +#define SSCG_CTRL_REG_5 0xac
> +#define SSCG_CTRL_REG_6 0xb0
> +#define PCS_INTERNAL_CONTROL_2 0x2d8
> +
> +#define PHY_CFG_PLLCFG 0x220
> +#define PHY_CFG_EIOS_DTCT_REG 0x3e4
> +#define PHY_CFG_GEN3_ALIGN_HOLDOFF_TIME 0x3e8
> +
> +#define PHY_MODE_FIXED 0x1
where is this used?
> +
> +enum qcom_uniphy_pcie_type {
> + PHY_TYPE_PCIE = 1,
> + PHY_TYPE_PCIE_GEN2,
> + PHY_TYPE_PCIE_GEN3,
> +};
> +
> +struct qcom_uniphy_pcie_regs {
> + u32 offset;
> + u32 val;
> +};
> +
> +struct qcom_uniphy_pcie_data {
> + int lane_offset; /* offset between the lane register bases */
> + u32 phy_type;
> + const struct qcom_uniphy_pcie_regs *init_seq;
> + u32 init_seq_num;
> + u32 pipe_clk_rate;
> +};
> +
> +struct qcom_uniphy_pcie {
> + struct phy phy;
> + struct device *dev;
> + const struct qcom_uniphy_pcie_data *data;
> + struct clk_bulk_data *clks;
> + int num_clks;
> + struct reset_control *resets;
> + void __iomem *base;
> + int lanes;
> +};
> +
> +#define phy_to_dw_phy(x) container_of((x), struct qca_uni_pcie_phy, phy)
> +
> +static const struct qcom_uniphy_pcie_regs ipq5332_regs[] = {
> + {
> + .offset = PHY_CFG_PLLCFG,
> + .val = 0x30,
> + }, {
> + .offset = PHY_CFG_EIOS_DTCT_REG,
> + .val = 0x53ef,
> + }, {
> + .offset = PHY_CFG_GEN3_ALIGN_HOLDOFF_TIME,
> + .val = 0xcf,
> + },
> +};
> +
> +static const struct qcom_uniphy_pcie_data ipq5332_data = {
> + .lane_offset = 0x800,
> + .phy_type = PHY_TYPE_PCIE_GEN3,
> + .init_seq = ipq5332_regs,
> + .init_seq_num = ARRAY_SIZE(ipq5332_regs),
> + .pipe_clk_rate = 250000000,
can be written as 250 * MEGA
> +};
> +
> +static void qcom_uniphy_pcie_init(struct qcom_uniphy_pcie *phy)
> +{
> + const struct qcom_uniphy_pcie_data *data = phy->data;
> + const struct qcom_uniphy_pcie_regs *init_seq;
> + void __iomem *base = phy->base;
> + int lane, i;
> +
> + for (lane = 0; lane < phy->lanes; lane++) {
> + init_seq = data->init_seq;
> +
> + for (i = 0; i < data->init_seq_num; i++)
> + writel(init_seq[i].val, base + init_seq[i].offset);
> +
> + base += data->lane_offset;
> + }
> +}
> +
> +static int qcom_uniphy_pcie_power_off(struct phy *x)
> +{
> + struct qcom_uniphy_pcie *phy = phy_get_drvdata(x);
> +
> + clk_bulk_disable_unprepare(phy->num_clks, phy->clks);
> +
> + return reset_control_assert(phy->resets);
> +}
> +
> +static int qcom_uniphy_pcie_power_on(struct phy *x)
> +{
> + struct qcom_uniphy_pcie *phy = phy_get_drvdata(x);
> + int ret;
> +
> + ret = reset_control_assert(phy->resets);
> + if (ret) {
> + dev_err(phy->dev, "reset assert failed (%d)\n", ret);
> + return ret;
> + }
> +
> + usleep_range(RST_ASSERT_DELAY_MIN_US, RST_ASSERT_DELAY_MAX_US);
> +
> + ret = reset_control_deassert(phy->resets);
> + if (ret) {
> + dev_err(phy->dev, "reset deassert failed (%d)\n", ret);
> + return ret;
> + }
> +
> + usleep_range(PIPE_CLK_DELAY_MIN_US, PIPE_CLK_DELAY_MAX_US);
> +
> + ret = clk_bulk_prepare_enable(phy->num_clks, phy->clks);
> + if (ret) {
> + dev_err(phy->dev, "clk prepare and enable failed %d\n", ret);
> + return ret;
> + }
> +
> + usleep_range(CLK_EN_DELAY_MIN_US, CLK_EN_DELAY_MAX_US);
> +
> + qcom_uniphy_pcie_init(phy);
> +
> + return 0;
> +}
> +
> +static inline int qcom_uniphy_pcie_get_resources(struct platform_device *pdev,
> + struct qcom_uniphy_pcie *phy)
> +{
> + struct resource *res;
> +
> + phy->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> + if (IS_ERR(phy->base))
> + return PTR_ERR(phy->base);
> +
> + phy->num_clks = devm_clk_bulk_get_all(phy->dev, &phy->clks);
> + if (phy->num_clks < 0)
> + return phy->num_clks;
> +
> + phy->resets = devm_reset_control_array_get_exclusive(phy->dev);
> + if (IS_ERR(phy->resets))
> + return PTR_ERR(phy->resets);
> +
> + return 0;
> +}
> +
> +/*
> + * Register a fixed rate pipe clock.
> + *
> + * The <s>_pipe_clksrc generated by PHY goes to the GCC that gate
> + * controls it. The <s>_pipe_clk coming out of the GCC is requested
> + * by the PHY driver for its operations.
> + * We register the <s>_pipe_clksrc here. The gcc driver takes care
> + * of assigning this <s>_pipe_clksrc as parent to <s>_pipe_clk.
> + * Below picture shows this relationship.
> + *
> + * +---------------+
> + * | PHY block |<<---------------------------------------+
> + * | | |
> + * | +-------+ | +-----+ |
> + * I/P---^-->| PLL |---^--->pipe_clksrc--->| GCC |--->pipe_clk---+
> + * clk | +-------+ | +-----+
> + * +---------------+
> + */
> +static inline int phy_pipe_clk_register(struct qcom_uniphy_pcie *phy, int id)
> +{
> + const struct qcom_uniphy_pcie_data *data = phy->data;
> + struct clk_hw *hw;
> + char name[64];
> +
> + snprintf(name, sizeof(name), "phy%d_pipe_clk_src", id);
> + hw = devm_clk_hw_register_fixed_rate(phy->dev, name, NULL, 0,
> + data->pipe_clk_rate);
> + if (IS_ERR(hw))
> + return dev_err_probe(phy->dev, PTR_ERR(hw),
> + "Unable to register %s\n", name);
> +
> + return devm_of_clk_add_hw_provider(phy->dev, of_clk_hw_simple_get, hw);
> +}
> +
> +static const struct of_device_id qcom_uniphy_pcie_id_table[] = {
> + {
> + .compatible = "qcom,ipq5332-uniphy-pcie-phy",
> + .data = &ipq5332_data,
> + }, {
> + /* Sentinel */
> + },
> +};
> +MODULE_DEVICE_TABLE(of, qcom_uniphy_pcie_id_table);
> +
> +static const struct phy_ops pcie_ops = {
> + .power_on = qcom_uniphy_pcie_power_on,
> + .power_off = qcom_uniphy_pcie_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int qcom_uniphy_pcie_probe(struct platform_device *pdev)
> +{
> + struct phy_provider *phy_provider;
> + struct device *dev = &pdev->dev;
> + struct qcom_uniphy_pcie *phy;
> + struct phy *generic_phy;
> + int ret;
> +
> + phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, phy);
> + phy->dev = &pdev->dev;
> +
> + phy->data = of_device_get_match_data(dev);
> + if (!phy->data)
> + return -EINVAL;
> +
> + ret = of_property_read_u32(dev_of_node(dev), "num-lanes", &phy->lanes);
> + if (ret)
> + return dev_err_probe(dev, ret, "Couldn't read num-lanes\n");
> +
> + ret = qcom_uniphy_pcie_get_resources(pdev, phy);
> + if (ret < 0)
> + return dev_err_probe(&pdev->dev, ret,
> + "failed to get resources: %d\n", ret);
> +
> + generic_phy = devm_phy_create(phy->dev, NULL, &pcie_ops);
> + if (IS_ERR(generic_phy))
> + return PTR_ERR(generic_phy);
> +
> + phy_set_drvdata(generic_phy, phy);
> +
> + ret = phy_pipe_clk_register(phy, generic_phy->id);
> + if (ret)
> + dev_err(&pdev->dev, "failed to register phy pipe clk\n");
> +
> + phy_provider = devm_of_phy_provider_register(phy->dev,
> + of_phy_simple_xlate);
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
should we not unroll the pipe clk registration here?
> +
> + return 0;
> +}
> +
> +static struct platform_driver qcom_uniphy_pcie_driver = {
> + .probe = qcom_uniphy_pcie_probe,
> + .driver = {
> + .name = "qcom-uniphy-pcie",
> + .of_match_table = qcom_uniphy_pcie_id_table,
> + },
> +};
> +
> +module_platform_driver(qcom_uniphy_pcie_driver);
> +
> +MODULE_DESCRIPTION("PCIE QCOM UNIPHY driver");
> +MODULE_LICENSE("GPL");
> --
> 2.34.1
--
~Vinod
