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Wed, 12 Jul 2023 11:39:15 GMT Received: from varda-linux.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Wed, 12 Jul 2023 04:39:07 -0700 From: Varadarajan Narayanan To: , , , , , , , , , , , , , , , , , , , , , , , , , CC: Varadarajan Narayanan Subject: [PATCH v4 3/6] phy: qcom-m31: Introduce qcom,m31 USB phy driver Date: Wed, 12 Jul 2023 17:08:20 +0530 Message-ID: <3a8baa278457c62f24504ab817b7ba5431391394.1689160067.git.quic_varada@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 3c_JwGurkXdhntGRhz22P39stqldc_NT X-Proofpoint-ORIG-GUID: 3c_JwGurkXdhntGRhz22P39stqldc_NT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-12_06,2023-07-11_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 malwarescore=0 spamscore=0 mlxscore=0 mlxlogscore=999 phishscore=0 adultscore=0 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307120104 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230712_043951_892777_D049B5AC X-CRM114-Status: GOOD ( 32.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the M31 USB2 phy driver. Signed-off-by: Varadarajan Narayanan --- v4: Remove unused enum Error handling for devm_clk_get v1: Combine driver, makefile and kconfig into 1 patch Remove 'qscratch' region and its usage. The controller driver takes care of those settings Use compatible/data to handle ipq5332 init Drop the default case Get resources by index instead of name as there is only one resource Add clock Fix review comments in the driver --- drivers/phy/qualcomm/Kconfig | 11 ++ drivers/phy/qualcomm/Makefile | 1 + drivers/phy/qualcomm/phy-qcom-m31.c | 256 ++++++++++++++++++++++++++++++++++++ 3 files changed, 268 insertions(+) create mode 100644 drivers/phy/qualcomm/phy-qcom-m31.c diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig index 97ca595..76be191 100644 --- a/drivers/phy/qualcomm/Kconfig +++ b/drivers/phy/qualcomm/Kconfig @@ -197,3 +197,14 @@ config PHY_QCOM_SGMII_ETH help Enable this to support the internal SerDes/SGMII PHY on various Qualcomm chipsets. + +config PHY_QCOM_M31_USB + tristate "Qualcomm M31 HS PHY driver support" + depends on (USB || USB_GADGET) && ARCH_QCOM + select USB_PHY + help + Enable this to support M31 HS PHY transceivers on Qualcomm chips + with DWC3 USB core. It handles PHY initialization, clock + management required after resetting the hardware and power + management. This driver is required even for peripheral only or + host only mode configurations. diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile index b030858..0b5dd66 100644 --- a/drivers/phy/qualcomm/Makefile +++ b/drivers/phy/qualcomm/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_PHY_QCOM_USB_SS) += phy-qcom-usb-ss.o obj-$(CONFIG_PHY_QCOM_USB_SNPS_FEMTO_V2)+= phy-qcom-snps-femto-v2.o obj-$(CONFIG_PHY_QCOM_IPQ806X_USB) += phy-qcom-ipq806x-usb.o obj-$(CONFIG_PHY_QCOM_SGMII_ETH) += phy-qcom-sgmii-eth.o +obj-$(CONFIG_PHY_QCOM_M31_USB) += phy-qcom-m31.o diff --git a/drivers/phy/qualcomm/phy-qcom-m31.c b/drivers/phy/qualcomm/phy-qcom-m31.c new file mode 100644 index 0000000..fd568ef --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-m31.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2014-2016, 2020, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define USB2PHY_PORT_UTMI_CTRL1 0x40 + +#define USB2PHY_PORT_UTMI_CTRL2 0x44 + #define UTMI_ULPI_SEL BIT(7) + #define UTMI_TEST_MUX_SEL BIT(6) + +#define HS_PHY_CTRL_REG 0x10 + #define UTMI_OTG_VBUS_VALID BIT(20) + #define SW_SESSVLD_SEL BIT(28) + +#define USB_PHY_UTMI_CTRL0 0x3c + +#define USB_PHY_UTMI_CTRL5 0x50 + #define POR_EN BIT(1) + #define ATERESET ~BIT(0) + +#define USB_PHY_HS_PHY_CTRL_COMMON0 0x54 + #define COMMONONN BIT(7) + #define FSEL BIT(4) + #define RETENABLEN BIT(3) + #define FREQ_24MHZ (5 << 4) + +#define USB_PHY_HS_PHY_CTRL2 0x64 + #define USB2_SUSPEND_N_SEL BIT(3) + #define USB2_SUSPEND_N BIT(2) + #define USB2_UTMI_CLK_EN BIT(1) + +#define USB_PHY_CFG0 0x94 + #define UTMI_PHY_OVERRIDE_EN BIT(1) + +#define USB_PHY_REFCLK_CTRL 0xa0 + #define CLKCORE BIT(1) + +#define USB2PHY_PORT_POWERDOWN 0xa4 + #define POWER_UP BIT(0) + #define POWER_DOWN 0 + +#define USB_PHY_FSEL_SEL 0xb8 + #define FREQ_SEL BIT(0) + +#define USB2PHY_USB_PHY_M31_XCFGI_1 0xbc + #define USB2_0_TX_ENABLE BIT(2) + +#define USB2PHY_USB_PHY_M31_XCFGI_4 0xc8 + #define HSTX_SLEW_RATE_565PS GENMASK(1, 0) + #define PLL_CHARGING_PUMP_CURRENT_35UA GENMASK(4, 3) + #define ODT_VALUE_38_02_OHM GENMASK(7, 6) + +#define USB2PHY_USB_PHY_M31_XCFGI_5 0xcc + #define ODT_VALUE_45_02_OHM BIT(2) + #define HSTX_PRE_EMPHASIS_LEVEL_0_55MA BIT(0) + +#define USB2PHY_USB_PHY_M31_XCFGI_11 0xe4 + #define XCFG_COARSE_TUNE_NUM BIT(1) + #define XCFG_FINE_TUNE_NUM BIT(3) + +struct m31_phy_regs { + u32 off; + u32 val; + u32 delay; +}; + +struct m31_priv_data { + bool ulpi_mode; + const struct m31_phy_regs *regs; +}; + +#define M31_REG(__o, __v, __d) \ + { .off = __o, .val = __v, .delay = __d } + +#define M31_REG_INVALID 0xffffffffu + +struct m31_phy_regs m31_ipq5332_regs[] = { + M31_REG(USB_PHY_CFG0, UTMI_PHY_OVERRIDE_EN, 0), + M31_REG(USB_PHY_UTMI_CTRL5, POR_EN, 15), + M31_REG(USB_PHY_FSEL_SEL, FREQ_SEL, 0), + M31_REG(USB_PHY_HS_PHY_CTRL_COMMON0, + COMMONONN | FREQ_24MHZ | RETENABLEN, 0), + M31_REG(USB_PHY_UTMI_CTRL5, POR_EN & ATERESET, 0), + M31_REG(USB_PHY_HS_PHY_CTRL2, + USB2_SUSPEND_N_SEL | USB2_SUSPEND_N | USB2_UTMI_CLK_EN, 0), + M31_REG(USB2PHY_USB_PHY_M31_XCFGI_11, + XCFG_COARSE_TUNE_NUM | XCFG_FINE_TUNE_NUM, 0), + M31_REG(USB2PHY_USB_PHY_M31_XCFGI_4, + HSTX_SLEW_RATE_565PS | PLL_CHARGING_PUMP_CURRENT_35UA | + ODT_VALUE_38_02_OHM, 0), + M31_REG(USB2PHY_USB_PHY_M31_XCFGI_1, USB2_0_TX_ENABLE, 0), + M31_REG(USB2PHY_USB_PHY_M31_XCFGI_5, + ODT_VALUE_45_02_OHM | HSTX_PRE_EMPHASIS_LEVEL_0_55MA, 4), + M31_REG(USB_PHY_UTMI_CTRL5, 0x0, 0), + M31_REG(USB_PHY_HS_PHY_CTRL2, USB2_SUSPEND_N | USB2_UTMI_CLK_EN, 0), + M31_REG(M31_REG_INVALID, 0, 0), +}; + +struct m31usb_phy { + struct usb_phy phy; + void __iomem *base; + const struct m31_phy_regs *regs; + + struct clk *cfg_ahb_clk; + struct reset_control *phy_reset; + + bool cable_connected; + bool suspended; + bool ulpi_mode; +}; + +static void m31usb_phy_enable_clock(struct m31usb_phy *qphy) +{ + const struct m31_phy_regs *regs = qphy->regs; + + for (; regs->off != M31_REG_INVALID; regs++) { + writel(regs->val, qphy->base + regs->off); + if (regs->delay) + udelay(regs->delay); + } +} + +static int m31usb_phy_init(struct usb_phy *phy) +{ + int ret; + struct m31usb_phy *qphy = container_of(phy, struct m31usb_phy, phy); + + ret = clk_prepare_enable(qphy->cfg_ahb_clk); + if (ret) { + dev_err(phy->dev, "failed to enable cfg ahb clock, %d\n", ret); + return ret; + } + + /* Perform phy reset */ + reset_control_assert(qphy->phy_reset); + udelay(5); + reset_control_deassert(qphy->phy_reset); + + /* configure for ULPI mode if requested */ + if (qphy->ulpi_mode) + writel(0x0, qphy->base + USB2PHY_PORT_UTMI_CTRL2); + + /* Enable the PHY */ + writel(POWER_UP, qphy->base + USB2PHY_PORT_POWERDOWN); + + /* Make sure above write completed */ + wmb(); + + /* Turn on phy ref clock */ + m31usb_phy_enable_clock(qphy); + + return 0; +} + +static void m31usb_phy_shutdown(struct usb_phy *phy) +{ + struct m31usb_phy *qphy = container_of(phy, struct m31usb_phy, phy); + + /* Disable the PHY */ + writel_relaxed(POWER_DOWN, qphy->base + USB2PHY_PORT_POWERDOWN); + /* Make sure above write completed */ + wmb(); + + clk_disable_unprepare(qphy->cfg_ahb_clk); +} + +static int m31usb_phy_probe(struct platform_device *pdev) +{ + const struct m31_priv_data *data; + struct device *dev = &pdev->dev; + struct m31usb_phy *qphy; + int ret; + + qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL); + if (!qphy) + return -ENOMEM; + + qphy->phy.dev = dev; + + qphy->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(qphy->base)) + return PTR_ERR(qphy->base); + + qphy->phy_reset = devm_reset_control_get_exclusive_by_index(dev, 0); + if (IS_ERR(qphy->phy_reset)) + return PTR_ERR(qphy->phy_reset); + + qphy->cfg_ahb_clk = devm_clk_get(dev, "cfg_ahb"); + if (IS_ERR(qphy->cfg_ahb_clk)) { + ret = PTR_ERR(qphy->cfg_ahb_clk); + dev_err(dev, "failed to get cfg_ahb clock, %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, qphy); + + data = of_device_get_match_data(dev); + qphy->regs = data->regs; + qphy->ulpi_mode = data->ulpi_mode; + + qphy->phy.label = "m31-usb-phy"; + qphy->phy.init = m31usb_phy_init; + qphy->phy.shutdown = m31usb_phy_shutdown; + qphy->phy.type = USB_PHY_TYPE_USB2; + + ret = usb_add_phy_dev(&qphy->phy); + + return ret; +} + +static void m31usb_phy_remove(struct platform_device *pdev) +{ + struct m31usb_phy *qphy = platform_get_drvdata(pdev); + + usb_remove_phy(&qphy->phy); +} + +static const struct m31_priv_data m31_ipq5332_data = { + .ulpi_mode = false, + .regs = m31_ipq5332_regs, +}; + +static const struct of_device_id m31usb_phy_id_table[] = { + { .compatible = "qcom,ipq5332-usb-hsphy", .data = &m31_ipq5332_data }, + { }, +}; +MODULE_DEVICE_TABLE(of, m31usb_phy_id_table); + +static struct platform_driver m31usb_phy_driver = { + .probe = m31usb_phy_probe, + .remove_new = m31usb_phy_remove, + .driver = { + .name = "qcom-m31usb-phy", + .of_match_table = m31usb_phy_id_table, + }, +}; + +module_platform_driver(m31usb_phy_driver); + +MODULE_DESCRIPTION("USB2 Qualcomm M31 HSPHY driver"); +MODULE_LICENSE("GPL");