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Wed, 7 Jun 2023 10:56:56 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 15.2.986.42; Wed, 7 Jun 2023 03:56:47 -0700 From: Varadarajan Narayanan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Varadarajan Narayanan Subject: [PATCH 3/9] phy: qcom-m31: Introduce qcom,m31 USB phy driver Date: Wed, 7 Jun 2023 16:26:07 +0530 Message-ID: <6bb345c6a57ee27516764f36ba7d34fd1a719b87.1686126439.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: WgbwX2trXJn2W8oQouqhsfCiXEOE3s8o X-Proofpoint-ORIG-GUID: WgbwX2trXJn2W8oQouqhsfCiXEOE3s8o X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-07_06,2023-06-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 mlxlogscore=999 phishscore=0 suspectscore=0 priorityscore=1501 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306070089 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230607_035716_991678_C97B398B X-CRM114-Status: GOOD ( 29.44 ) 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 --- drivers/phy/qualcomm/phy-qcom-m31.c | 360 ++++++++++++++++++++++++++++++++++++ 1 file changed, 360 insertions(+) create mode 100644 drivers/phy/qualcomm/phy-qcom-m31.c diff --git a/drivers/phy/qualcomm/phy-qcom-m31.c b/drivers/phy/qualcomm/phy-qcom-m31.c new file mode 100644 index 0000000..d29a91e --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-m31.c @@ -0,0 +1,360 @@ +// 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 + +enum clk_reset_action { + CLK_RESET_DEASSERT = 0, + CLK_RESET_ASSERT = 1 +}; + +#define USB2PHY_PORT_POWERDOWN 0xA4 +#define POWER_UP BIT(0) +#define POWER_DOWN 0 + +#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_CFG0 0x94 +#define USB_PHY_UTMI_CTRL5 0x50 +#define USB_PHY_FSEL_SEL 0xB8 +#define USB_PHY_HS_PHY_CTRL_COMMON0 0x54 +#define USB_PHY_REFCLK_CTRL 0xA0 +#define USB_PHY_HS_PHY_CTRL2 0x64 +#define USB_PHY_UTMI_CTRL0 0x3c +#define USB2PHY_USB_PHY_M31_XCFGI_1 0xBC +#define USB2PHY_USB_PHY_M31_XCFGI_4 0xC8 +#define USB2PHY_USB_PHY_M31_XCFGI_5 0xCC +#define USB2PHY_USB_PHY_M31_XCFGI_11 0xE4 + +#define USB2_0_TX_ENABLE BIT(2) +#define HSTX_SLEW_RATE_565PS 3 +#define PLL_CHARGING_PUMP_CURRENT_35UA (3 << 3) +#define ODT_VALUE_38_02_OHM (3 << 6) +#define ODT_VALUE_45_02_OHM BIT(2) +#define HSTX_PRE_EMPHASIS_LEVEL_0_55MA (1) + +#define UTMI_PHY_OVERRIDE_EN BIT(1) +#define POR_EN BIT(1) +#define FREQ_SEL BIT(0) +#define COMMONONN BIT(7) +#define FSEL BIT(4) +#define RETENABLEN BIT(3) +#define USB2_SUSPEND_N_SEL BIT(3) +#define USB2_SUSPEND_N BIT(2) +#define USB2_UTMI_CLK_EN BIT(1) +#define CLKCORE BIT(1) +#define ATERESET ~BIT(0) +#define FREQ_24MHZ (5 << 4) +#define XCFG_COARSE_TUNE_NUM (2 << 0) +#define XCFG_FINE_TUNE_NUM (1 << 3) + +static void m31usb_write_readback(void *base, u32 offset, + const u32 mask, u32 val); + +struct m31usb_phy { + struct usb_phy phy; + void __iomem *base; + void __iomem *qscratch_base; + + struct reset_control *phy_reset; + + bool cable_connected; + bool suspended; + bool ulpi_mode; +}; + +static void m31usb_reset(struct m31usb_phy *qphy, u32 action) +{ + if (action == CLK_RESET_ASSERT) + reset_control_assert(qphy->phy_reset); + else + reset_control_deassert(qphy->phy_reset); + wmb(); /* ensure data is written to hw register */ +} + +static void m31usb_phy_enable_clock(struct m31usb_phy *qphy) +{ + /* Enable override ctrl */ + writel(UTMI_PHY_OVERRIDE_EN, qphy->base + USB_PHY_CFG0); + /* Enable POR*/ + writel(POR_EN, qphy->base + USB_PHY_UTMI_CTRL5); + udelay(15); + /* Configure frequency select value*/ + writel(FREQ_SEL, qphy->base + USB_PHY_FSEL_SEL); + /* Configure refclk frequency */ + writel(COMMONONN | FSEL | RETENABLEN, + qphy->base + USB_PHY_HS_PHY_CTRL_COMMON0); + /* select refclk source */ + writel(CLKCORE, qphy->base + USB_PHY_REFCLK_CTRL); + /* select ATERESET*/ + writel(POR_EN & ATERESET, qphy->base + USB_PHY_UTMI_CTRL5); + writel(USB2_SUSPEND_N_SEL | USB2_SUSPEND_N | USB2_UTMI_CLK_EN, + qphy->base + USB_PHY_HS_PHY_CTRL2); + writel(0x0, qphy->base + USB_PHY_UTMI_CTRL5); + writel(USB2_SUSPEND_N | USB2_UTMI_CLK_EN, + qphy->base + USB_PHY_HS_PHY_CTRL2); + /* Disable override ctrl */ + writel(0x0, qphy->base + USB_PHY_CFG0); +} + +static void ipq5332_m31usb_phy_enable_clock(struct m31usb_phy *qphy) +{ + /* Enable override ctrl */ + writel(UTMI_PHY_OVERRIDE_EN, qphy->base + USB_PHY_CFG0); + /* Enable POR*/ + writel(POR_EN, qphy->base + USB_PHY_UTMI_CTRL5); + udelay(15); + /* Configure frequency select value*/ + writel(FREQ_SEL, qphy->base + USB_PHY_FSEL_SEL); + /* Configure refclk frequency */ + writel(COMMONONN | FREQ_24MHZ | RETENABLEN, + qphy->base + USB_PHY_HS_PHY_CTRL_COMMON0); + /* select ATERESET*/ + writel(POR_EN & ATERESET, qphy->base + USB_PHY_UTMI_CTRL5); + writel(USB2_SUSPEND_N_SEL | USB2_SUSPEND_N | USB2_UTMI_CLK_EN, + qphy->base + USB_PHY_HS_PHY_CTRL2); + writel(XCFG_COARSE_TUNE_NUM | XCFG_FINE_TUNE_NUM, + qphy->base + USB2PHY_USB_PHY_M31_XCFGI_11); + /* Adjust HSTX slew rate to 565 ps*/ + /* Adjust PLL lock Time counter for release clock to 35uA */ + /* Adjust Manual control ODT value to 38.02 Ohm */ + writel(HSTX_SLEW_RATE_565PS | PLL_CHARGING_PUMP_CURRENT_35UA | + ODT_VALUE_38_02_OHM, qphy->base + USB2PHY_USB_PHY_M31_XCFGI_4); + /* + * Enable to always turn on USB 2.0 TX driver + * when system is in USB 2.0 HS mode + */ + writel(USB2_0_TX_ENABLE, qphy->base + USB2PHY_USB_PHY_M31_XCFGI_1); + /* Adjust Manual control ODT value to 45.02 Ohm */ + /* Adjust HSTX Pre-emphasis level to 0.55mA */ + writel(ODT_VALUE_45_02_OHM | HSTX_PRE_EMPHASIS_LEVEL_0_55MA, + qphy->base + USB2PHY_USB_PHY_M31_XCFGI_5); + udelay(4); + writel(0x0, qphy->base + USB_PHY_UTMI_CTRL5); + writel(USB2_SUSPEND_N | USB2_UTMI_CLK_EN, + qphy->base + USB_PHY_HS_PHY_CTRL2); +} + +static int m31usb_phy_init(struct usb_phy *phy) +{ + struct m31usb_phy *qphy = container_of(phy, struct m31usb_phy, phy); + + /* Perform phy reset */ + m31usb_reset(qphy, CLK_RESET_ASSERT); + usleep_range(1, 5); + m31usb_reset(qphy, CLK_RESET_DEASSERT); + + /* configure for ULPI mode if requested */ + if (qphy->ulpi_mode) + writel_relaxed(0x0, qphy->base + USB2PHY_PORT_UTMI_CTRL2); + + /* Enable the PHY */ + writel_relaxed(POWER_UP, qphy->base + USB2PHY_PORT_POWERDOWN); + + /* Make sure above write completed */ + wmb(); + + /* Turn on phy ref clock*/ + if (of_device_is_compatible(phy->dev->of_node, + "qcom,ipq5332-m31-usb-hsphy")) + ipq5332_m31usb_phy_enable_clock(qphy); + else + m31usb_phy_enable_clock(qphy); + + /* Set OTG VBUS Valid from HSPHY to controller */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + UTMI_OTG_VBUS_VALID, UTMI_OTG_VBUS_VALID); + /* Indicate value is driven by UTMI_OTG_VBUS_VALID bit */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + SW_SESSVLD_SEL, SW_SESSVLD_SEL); + + 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(); +} + +static void m31usb_write_readback(void *base, u32 offset, + const u32 mask, u32 val) +{ + u32 write_val, tmp = readl_relaxed(base + offset); + + tmp &= ~mask; /* retain other bits */ + write_val = tmp | val; + + writel_relaxed(write_val, base + offset); + /* Make sure above write completed */ + wmb(); + + /* Read back to see if val was written */ + tmp = readl_relaxed(base + offset); + tmp &= mask; /* clear other bits */ + + if (tmp != val) + pr_err("%s: write: %x to QSCRATCH: %x FAILED\n", + __func__, val, offset); +} + +static int m31usb_phy_notify_connect(struct usb_phy *phy, + enum usb_device_speed speed) +{ + struct m31usb_phy *qphy = container_of(phy, struct m31usb_phy, phy); + + qphy->cable_connected = true; + + dev_dbg(phy->dev, " cable_connected=%d\n", qphy->cable_connected); + + /* Set OTG VBUS Valid from HSPHY to controller */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + UTMI_OTG_VBUS_VALID, + UTMI_OTG_VBUS_VALID); + + /* Indicate value is driven by UTMI_OTG_VBUS_VALID bit */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + SW_SESSVLD_SEL, SW_SESSVLD_SEL); + + dev_dbg(phy->dev, "M31USB2 phy connect notification\n"); + return 0; +} + +static int m31usb_phy_notify_disconnect(struct usb_phy *phy, + enum usb_device_speed speed) +{ + struct m31usb_phy *qphy = container_of(phy, struct m31usb_phy, phy); + + qphy->cable_connected = false; + + dev_dbg(phy->dev, " cable_connected=%d\n", qphy->cable_connected); + + /* Set OTG VBUS Valid from HSPHY to controller */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + UTMI_OTG_VBUS_VALID, 0); + + /* Indicate value is driven by UTMI_OTG_VBUS_VALID bit */ + m31usb_write_readback(qphy->qscratch_base, HS_PHY_CTRL_REG, + SW_SESSVLD_SEL, 0); + + dev_dbg(phy->dev, "M31USB2 phy disconnect notification\n"); + return 0; +} + +static int m31usb_phy_probe(struct platform_device *pdev) +{ + struct m31usb_phy *qphy; + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + const char *phy_type; + + qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL); + if (!qphy) + return -ENOMEM; + + qphy->phy.dev = dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "m31usb_phy_base"); + qphy->base = devm_ioremap_resource(dev, res); + if (IS_ERR(qphy->base)) + return PTR_ERR(qphy->base); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "qscratch_base"); + if (res) { + qphy->qscratch_base = devm_ioremap(dev, res->start, + resource_size(res)); + if (IS_ERR(qphy->qscratch_base)) { + dev_dbg(dev, "couldn't ioremap qscratch_base\n"); + qphy->qscratch_base = NULL; + } + } + + qphy->phy_reset = devm_reset_control_get(dev, "usb2_phy_reset"); + if (IS_ERR(qphy->phy_reset)) + return PTR_ERR(qphy->phy_reset); + + qphy->ulpi_mode = false; + ret = of_property_read_string(dev->of_node, "phy_type", &phy_type); + + if (!ret) { + if (!strcasecmp(phy_type, "ulpi")) + qphy->ulpi_mode = true; + } else { + dev_err(dev, "error reading phy_type property\n"); + return ret; + } + + platform_set_drvdata(pdev, qphy); + + qphy->phy.label = "qcom-m31usb-phy"; + qphy->phy.init = m31usb_phy_init; + qphy->phy.shutdown = m31usb_phy_shutdown; + qphy->phy.type = USB_PHY_TYPE_USB2; + + if (qphy->qscratch_base) { + qphy->phy.notify_connect = m31usb_phy_notify_connect; + qphy->phy.notify_disconnect = m31usb_phy_notify_disconnect; + } + + ret = usb_add_phy_dev(&qphy->phy); + + return ret; +} + +static int m31usb_phy_remove(struct platform_device *pdev) +{ + struct m31usb_phy *qphy = platform_get_drvdata(pdev); + + usb_remove_phy(&qphy->phy); + + return 0; +} + +static const struct of_device_id m31usb_phy_id_table[] = { + { .compatible = "qcom,m31-usb-hsphy",}, + { .compatible = "qcom,ipq5332-m31-usb-hsphy",}, + { }, +}; +MODULE_DEVICE_TABLE(of, m31usb_phy_id_table); + +static struct platform_driver m31usb_phy_driver = { + .probe = m31usb_phy_probe, + .remove = m31usb_phy_remove, + .driver = { + .name = "qcom-m31usb-phy", + .of_match_table = of_match_ptr(m31usb_phy_id_table), + }, +}; + +module_platform_driver(m31usb_phy_driver); + +MODULE_DESCRIPTION("USB2 Qualcomm M31 HSPHY driver"); +MODULE_LICENSE("GPL");