From patchwork Tue Oct 3 12:08:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitheesh Sekar X-Patchwork-Id: 730477 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5FE52E75426 for ; Tue, 3 Oct 2023 12:09:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232258AbjJCMJz (ORCPT ); Tue, 3 Oct 2023 08:09:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232341AbjJCMJy (ORCPT ); Tue, 3 Oct 2023 08:09:54 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02678BF; Tue, 3 Oct 2023 05:09:50 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 393BOd8a032148; Tue, 3 Oct 2023 12:09:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=XxUO/qbrT5ElNvWaahYF67kV3a8t5H6ry31/gpptWUc=; b=cpmIzTdf2onTxVXxR3HR1leboaL9VpPFtL4gQLr21BucSn9buLvMVHDm7MWI8sEmR/hL y3kQbJSnYX4wj4bM6af8z8l4sxUlNkiDjLgod7mB8rdOuIvDKK/Ayn/N6bEznS9WCzjq 5BerOReq09Zb7iuDvUbUlG01XfGCfP1+LBk6fmkbcyoLw9N2oEUJfd9xwI7tvxOKOGwI CAizGw0Lv5o3Njk7wxupfY+pQidaOzWxVjUQkuoXMlah9kBozVCbCwGtjWUxgrrpmVt9 anfTDauDnZmVjkLbzMrjVYjP0AWA2JLkgrOQ4uMy/IOvW3h5xOTmWqqivnTXGZ1g76Bn vg== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tg77es8rv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 03 Oct 2023 12:09:37 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 393C9ZcI017389 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 3 Oct 2023 12:09:35 GMT Received: from nsekar-linux.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Tue, 3 Oct 2023 05:09:27 -0700 From: Nitheesh Sekar To: , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 3/6] phy: qcom: Introduce PCIe UNIPHY 28LP driver Date: Tue, 3 Oct 2023 17:38:43 +0530 Message-ID: <20231003120846.28626-4-quic_nsekar@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231003120846.28626-1-quic_nsekar@quicinc.com> References: <20231003120846.28626-1-quic_nsekar@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: IPyUCgX5TdJhzppoSnldHwUoCzvCu-Gt X-Proofpoint-GUID: IPyUCgX5TdJhzppoSnldHwUoCzvCu-Gt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-03_08,2023-10-02_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 mlxscore=0 bulkscore=0 clxscore=1015 malwarescore=0 suspectscore=0 spamscore=0 priorityscore=1501 mlxlogscore=999 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310030087 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add Qualcomm PCIe UNIPHY 28LP driver support present in Qualcomm IPQ5018 SoC and the phy init sequence. Signed-off-by: Nitheesh Sekar --- drivers/phy/qualcomm/Kconfig | 12 + drivers/phy/qualcomm/Makefile | 1 + .../phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c | 336 ++++++++++++++++++ 3 files changed, 349 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 d891058b7c39..b7d37cd98f02 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 ffd609ac6233..31105cd17bc9 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..5ef6ae7276cf --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-uniphy-pcie-28lp.c @@ -0,0 +1,336 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2023, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PIPE_CLK_DELAY_MIN_US 5000 +#define PIPE_CLK_DELAY_MAX_US 5100 +#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 uniphy_regs { + unsigned int offset; + unsigned int val; +}; + +struct uniphy_pcie_data { + int lanes; + /* 2nd lane offset */ + int lane_offset; + unsigned int phy_type; + const struct uniphy_regs *init_seq; + unsigned int init_seq_num; +}; + +struct qcom_uniphy_pcie { + struct phy phy; + struct device *dev; + const struct 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 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 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 uniphy_pcie_data *data = phy->data; + const struct uniphy_regs *init_seq; + void __iomem *base = phy->base; + int lane = 0; + int i; + + while (lane != data->lanes) { + init_seq = data->init_seq; + + for (i = 0; i < data->init_seq_num; i++, init_seq++) + writel(init_seq->val, base + init_seq->offset); + + if (data->lanes == 2) + base = base + data->lane_offset; + + lane++; + } +} + +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 = 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(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(30, 50); + + qcom_uniphy_pcie_init(phy); + return 0; +} + +static int qcom_uniphy_pcie_get_resources(struct platform_device *pdev, + struct qcom_uniphy_pcie *phy) +{ + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + phy->base = devm_ioremap_resource(phy->dev, 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 int phy_pipe_clk_register(struct qcom_uniphy_pcie *phy, + struct device_node *np) +{ + struct clk_fixed_rate *fixed; + struct clk_init_data init = { }; + int ret; + + ret = of_property_read_string(np, "clock-output-names", &init.name); + if (ret) { + dev_err(phy->dev, "%pOFn: No clock-output-names\n", np); + return ret; + } + + 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; + + ret = devm_clk_hw_register(phy->dev, &fixed->hw); + if (ret) + return ret; + + ret = devm_of_clk_add_hw_provider(phy->dev, of_clk_hw_simple_get, + &fixed->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, + }, + { /* 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(&pdev->dev, "failed to get resources: %d\n", ret); + return ret; + } + + ret = phy_pipe_clk_register(phy, np); + if (ret) + dev_err(&pdev->dev, "failed to register phy pipe clk\n"); + + 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); + phy_provider = devm_of_phy_provider_register(phy->dev, + of_phy_simple_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + return 0; +} + +static struct platform_driver qcom_uniphy_pcie_driver = { + .probe = qcom_uniphy_pcie_probe, + .driver = { + .name = "qcom-uniphy-pcie", + .owner = THIS_MODULE, + .of_match_table = qcom_uniphy_pcie_id_table, + }, +}; + +module_platform_driver(qcom_uniphy_pcie_driver); + +MODULE_ALIAS("platform:qcom-uniphy-pcie"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("PCIE QCOM UNIPHY driver");