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Tue, 27 Aug 2024 04:58:37 GMT Received: from hu-srichara-blr.qualcomm.com (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 26 Aug 2024 21:58:31 -0700 From: Sricharan R To: , , , , , , , , , , , , , , , , , , , , Subject: [PATCH V2 3/6] phy: qcom: Introduce PCIe UNIPHY 28LP driver Date: Tue, 27 Aug 2024 10:27:54 +0530 Message-ID: <20240827045757.1101194-4-quic_srichara@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240827045757.1101194-1-quic_srichara@quicinc.com> References: <20240827045757.1101194-1-quic_srichara@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 5dz-fSqnFsWLzmRYW0187KmxNXFOao8J X-Proofpoint-ORIG-GUID: 5dz-fSqnFsWLzmRYW0187KmxNXFOao8J X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-27_03,2024-08-26_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 spamscore=0 adultscore=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408270032 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240826_215845_398348_67DB40A9 X-CRM114-Status: GOOD ( 27.00 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org From: Nitheesh Sekar Add Qualcomm PCIe UNIPHY 28LP driver support present in Qualcomm IPQ5018 SoC and the phy init sequence. Signed-off-by: Nitheesh Sekar Signed-off-by: Sricharan Ramabadhran --- [v2] Added the single lane compatible Added dev_err_probe, removed .owner, MODULE_ALIAS. Used for() instead of while in qcom_uniphy_pcie_init Used devm_platform_get_and_ioremap_resource Dropped usage of clock-output-name Fixed init order to enable clks first, then reset drivers/phy/qualcomm/Kconfig | 12 + drivers/phy/qualcomm/Makefile | 1 + .../phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c | 341 ++++++++++++++++++ 3 files changed, 354 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..8f043e8cb71c 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 IPQ5018 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..877e1f0f8927 --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2024, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_MODE_FIXED 0x1 + +enum qcom_uniphy_pcie_type { + PHY_TYPE_PCIE = 1, + PHY_TYPE_PCIE_GEN2, + PHY_TYPE_PCIE_GEN3, +}; + +struct qcom_uniphy_regs { + unsigned int offset; + unsigned int val; +}; + +struct qcom_uniphy_pcie_data { + int lanes; + /* 2nd lane offset */ + int lane_offset; + unsigned int phy_type; + const struct qcom_uniphy_regs *init_seq; + unsigned int init_seq_num; +}; + +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; +}; + +#define phy_to_dw_phy(x) container_of((x), struct qca_uni_pcie_phy, phy) + +static const struct qcom_uniphy_regs ipq5018_regs[] = { + { + .offset = SSCG_CTRL_REG_4, + .val = 0x1cb9, + }, + { + .offset = SSCG_CTRL_REG_5, + .val = 0x023a, + }, + { + .offset = SSCG_CTRL_REG_3, + .val = 0xd360, + }, + { + .offset = SSCG_CTRL_REG_1, + .val = 0x1, + }, + { + .offset = SSCG_CTRL_REG_2, + .val = 0xeb, + }, + { + .offset = CDR_CTRL_REG_4, + .val = 0x3f9, + }, + { + .offset = CDR_CTRL_REG_5, + .val = 0x1c9, + }, + { + .offset = CDR_CTRL_REG_2, + .val = 0x419, + }, + { + .offset = CDR_CTRL_REG_1, + .val = 0x200, + }, + { + .offset = PCS_INTERNAL_CONTROL_2, + .val = 0xf101, + }, +}; + +static const struct qcom_uniphy_pcie_data ipq5018_2x1_data = { + .lanes = 1, + .lane_offset = 0x800, + .phy_type = PHY_TYPE_PCIE_GEN2, + .init_seq = ipq5018_regs, + .init_seq_num = ARRAY_SIZE(ipq5018_regs), +}; + +static const struct qcom_uniphy_pcie_data ipq5018_2x2_data = { + .lanes = 2, + .lane_offset = 0x800, + .phy_type = PHY_TYPE_PCIE_GEN2, + .init_seq = ipq5018_regs, + .init_seq_num = ARRAY_SIZE(ipq5018_regs), +}; + +static void qcom_uniphy_pcie_init(struct qcom_uniphy_pcie *phy) +{ + const struct qcom_uniphy_pcie_data *data = phy->data; + const struct qcom_uniphy_regs *init_seq; + void __iomem *base = phy->base; + int lane = 0; + int i; + + for (lane = 0; lane < data->lanes; lane++) { + init_seq = data->init_seq; + + for (i = 0; i < data->init_seq_num; i++, init_seq++) + writel(init_seq->val, base + init_seq->offset); + + base += data->lane_offset; + } +} + +static int qcom_uniphy_pcie_power_off(struct phy *x) +{ + struct qcom_uniphy_pcie *phy = phy_get_drvdata(x); + + reset_control_assert(phy->resets); + + clk_bulk_disable_unprepare(phy->num_clks, phy->clks); + + return 0; +} + +static int qcom_uniphy_pcie_power_on(struct phy *x) +{ + int ret; + struct qcom_uniphy_pcie *phy = phy_get_drvdata(x); + + 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(30, 50); + + ret = reset_control_assert(phy->resets); + if (ret) { + dev_err(phy->dev, "reset assert failed (%d)\n", ret); + return ret; + } + + /* + * Delay periods before and after reset deassert are working values + * from downstream Codeaurora kernel + */ + usleep_range(100, 150); + + ret = reset_control_deassert(phy->resets); + if (ret) { + dev_err(phy->dev, "reset deassert failed (%d)\n", ret); + return ret; + } + + usleep_range(5000, 5100); + + 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)) { + dev_err(phy->dev, "cannot get phy registers\n"); + 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 _pipe_clksrc generated by PHY goes to the GCC that gate + * controls it. The _pipe_clk coming out of the GCC is requested + * by the PHY driver for its operations. + * We register the _pipe_clksrc here. The gcc driver takes care + * of assigning this _pipe_clksrc as parent to _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, + struct device_node *np) +{ + struct clk_init_data init = { }; + struct clk_fixed_rate *fixed; + struct clk_hw *hw; + char name[64]; + int ret; + + snprintf(name, sizeof(name), "%s::pipe_clk", dev_name(phy->dev)); + + fixed = devm_kzalloc(phy->dev, sizeof(*fixed), GFP_KERNEL); + if (!fixed) + return -ENOMEM; + + init.ops = &clk_fixed_rate_ops; + fixed->fixed_rate = 125000000; + fixed->hw.init = &init; + hw = &fixed->hw; + + hw = devm_clk_hw_register_fixed_rate(phy->dev, name, NULL, + 0, 125000000); + if (IS_ERR(hw)) + return PTR_ERR(hw); + + ret = devm_of_clk_add_hw_provider(phy->dev, of_clk_hw_simple_get, hw); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id qcom_uniphy_pcie_id_table[] = { + { + .compatible = "qcom,ipq5018-uniphy-pcie-gen2x2", + .data = &ipq5018_2x2_data, + }, + { + .compatible = "qcom,ipq5018-uniphy-pcie-gen2x1", + .data = &ipq5018_2x1_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 qcom_uniphy_pcie *phy; + int ret; + struct phy *generic_phy; + struct phy_provider *phy_provider; + struct device *dev = &pdev->dev; + struct device_node *np = of_node_get(dev->of_node); + + 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 = qcom_uniphy_pcie_get_resources(pdev, phy); + if (ret < 0) + dev_err_probe(&pdev->dev, ret, "Failed to get resources:\n"); + + ret = phy_pipe_clk_register(phy, np); + if (ret) + dev_err_probe(&pdev->dev, ret, "pipe clk register failed\n"); + + generic_phy = devm_phy_create(phy->dev, NULL, &pcie_ops); + if (IS_ERR(generic_phy)) + dev_err_probe(&pdev->dev, PTR_ERR(generic_phy), + "phy create failed\n"); + + phy_set_drvdata(generic_phy, phy); + phy_provider = devm_of_phy_provider_register(phy->dev, + of_phy_simple_xlate); + if (IS_ERR(phy_provider)) + dev_err_probe(&pdev->dev, PTR_ERR(phy_provider), + "phy register failed\n"); + + 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_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("PCIE QCOM UNIPHY driver");