From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/usb/dwc3/dwc3-am62.c | 375 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 375 insertions(+) create mode 100644 drivers/usb/dwc3/dwc3-am62.c (limited to 'drivers/usb/dwc3/dwc3-am62.c') diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c new file mode 100644 index 0000000000..90a587bc29 --- /dev/null +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -0,0 +1,375 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dwc3-am62.c - TI specific Glue layer for AM62 DWC3 USB Controller + * + * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "core.h" + +/* USB WRAPPER register offsets */ +#define USBSS_PID 0x0 +#define USBSS_OVERCURRENT_CTRL 0x4 +#define USBSS_PHY_CONFIG 0x8 +#define USBSS_PHY_TEST 0xc +#define USBSS_CORE_STAT 0x14 +#define USBSS_HOST_VBUS_CTRL 0x18 +#define USBSS_MODE_CONTROL 0x1c +#define USBSS_WAKEUP_CONFIG 0x30 +#define USBSS_WAKEUP_STAT 0x34 +#define USBSS_OVERRIDE_CONFIG 0x38 +#define USBSS_IRQ_MISC_STATUS_RAW 0x430 +#define USBSS_IRQ_MISC_STATUS 0x434 +#define USBSS_IRQ_MISC_ENABLE_SET 0x438 +#define USBSS_IRQ_MISC_ENABLE_CLR 0x43c +#define USBSS_IRQ_MISC_EOI 0x440 +#define USBSS_INTR_TEST 0x490 +#define USBSS_VBUS_FILTER 0x614 +#define USBSS_VBUS_STAT 0x618 +#define USBSS_DEBUG_CFG 0x708 +#define USBSS_DEBUG_DATA 0x70c +#define USBSS_HOST_HUB_CTRL 0x714 + +/* PHY CONFIG register bits */ +#define USBSS_PHY_VBUS_SEL_MASK GENMASK(2, 1) +#define USBSS_PHY_VBUS_SEL_SHIFT 1 +#define USBSS_PHY_LANE_REVERSE BIT(0) + +/* CORE STAT register bits */ +#define USBSS_CORE_OPERATIONAL_MODE_MASK GENMASK(13, 12) +#define USBSS_CORE_OPERATIONAL_MODE_SHIFT 12 + +/* MODE CONTROL register bits */ +#define USBSS_MODE_VALID BIT(0) + +/* WAKEUP CONFIG register bits */ +#define USBSS_WAKEUP_CFG_OVERCURRENT_EN BIT(3) +#define USBSS_WAKEUP_CFG_LINESTATE_EN BIT(2) +#define USBSS_WAKEUP_CFG_SESSVALID_EN BIT(1) +#define USBSS_WAKEUP_CFG_VBUSVALID_EN BIT(0) + +#define USBSS_WAKEUP_CFG_ALL (USBSS_WAKEUP_CFG_VBUSVALID_EN | \ + USBSS_WAKEUP_CFG_SESSVALID_EN | \ + USBSS_WAKEUP_CFG_LINESTATE_EN | \ + USBSS_WAKEUP_CFG_OVERCURRENT_EN) + +#define USBSS_WAKEUP_CFG_NONE 0 + +/* WAKEUP STAT register bits */ +#define USBSS_WAKEUP_STAT_OVERCURRENT BIT(4) +#define USBSS_WAKEUP_STAT_LINESTATE BIT(3) +#define USBSS_WAKEUP_STAT_SESSVALID BIT(2) +#define USBSS_WAKEUP_STAT_VBUSVALID BIT(1) +#define USBSS_WAKEUP_STAT_CLR BIT(0) + +/* IRQ_MISC_STATUS_RAW register bits */ +#define USBSS_IRQ_MISC_RAW_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_RAW_SESSVALID BIT(20) + +/* IRQ_MISC_STATUS register bits */ +#define USBSS_IRQ_MISC_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_SESSVALID BIT(20) + +/* IRQ_MISC_ENABLE_SET register bits */ +#define USBSS_IRQ_MISC_ENABLE_SET_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_ENABLE_SET_SESSVALID BIT(20) + +/* IRQ_MISC_ENABLE_CLR register bits */ +#define USBSS_IRQ_MISC_ENABLE_CLR_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_ENABLE_CLR_SESSVALID BIT(20) + +/* IRQ_MISC_EOI register bits */ +#define USBSS_IRQ_MISC_EOI_VECTOR BIT(0) + +/* VBUS_STAT register bits */ +#define USBSS_VBUS_STAT_SESSVALID BIT(2) +#define USBSS_VBUS_STAT_VBUSVALID BIT(0) + +/* Mask for PHY PLL REFCLK */ +#define PHY_PLL_REFCLK_MASK GENMASK(3, 0) + +#define DWC3_AM62_AUTOSUSPEND_DELAY 100 + +struct dwc3_am62 { + struct device *dev; + void __iomem *usbss; + struct clk *usb2_refclk; + int rate_code; + struct regmap *syscon; + unsigned int offset; + unsigned int vbus_divider; + u32 wakeup_stat; +}; + +static const int dwc3_ti_rate_table[] = { /* in KHZ */ + 9600, + 10000, + 12000, + 19200, + 20000, + 24000, + 25000, + 26000, + 38400, + 40000, + 58000, + 50000, + 52000, +}; + +static inline u32 dwc3_ti_readl(struct dwc3_am62 *am62, u32 offset) +{ + return readl((am62->usbss) + offset); +} + +static inline void dwc3_ti_writel(struct dwc3_am62 *am62, u32 offset, u32 value) +{ + writel(value, (am62->usbss) + offset); +} + +static int phy_syscon_pll_refclk(struct dwc3_am62 *am62) +{ + struct device *dev = am62->dev; + struct device_node *node = dev->of_node; + struct of_phandle_args args; + struct regmap *syscon; + int ret; + + syscon = syscon_regmap_lookup_by_phandle(node, "ti,syscon-phy-pll-refclk"); + if (IS_ERR(syscon)) { + dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n"); + return PTR_ERR(syscon); + } + + am62->syscon = syscon; + + ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-phy-pll-refclk", 1, + 0, &args); + if (ret) + return ret; + + am62->offset = args.args[0]; + + ret = regmap_update_bits(am62->syscon, am62->offset, PHY_PLL_REFCLK_MASK, am62->rate_code); + if (ret) { + dev_err(dev, "failed to set phy pll reference clock rate\n"); + return ret; + } + + return 0; +} + +static int dwc3_ti_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = pdev->dev.of_node; + struct dwc3_am62 *am62; + int i, ret; + unsigned long rate; + u32 reg; + + am62 = devm_kzalloc(dev, sizeof(*am62), GFP_KERNEL); + if (!am62) + return -ENOMEM; + + am62->dev = dev; + platform_set_drvdata(pdev, am62); + + am62->usbss = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(am62->usbss)) { + dev_err(dev, "can't map IOMEM resource\n"); + return PTR_ERR(am62->usbss); + } + + am62->usb2_refclk = devm_clk_get(dev, "ref"); + if (IS_ERR(am62->usb2_refclk)) { + dev_err(dev, "can't get usb2_refclk\n"); + return PTR_ERR(am62->usb2_refclk); + } + + /* Calculate the rate code */ + rate = clk_get_rate(am62->usb2_refclk); + rate /= 1000; // To KHz + for (i = 0; i < ARRAY_SIZE(dwc3_ti_rate_table); i++) { + if (dwc3_ti_rate_table[i] == rate) + break; + } + + if (i == ARRAY_SIZE(dwc3_ti_rate_table)) { + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); + return -EINVAL; + } + + am62->rate_code = i; + + /* Read the syscon property and set the rate code */ + ret = phy_syscon_pll_refclk(am62); + if (ret) + return ret; + + /* VBUS divider select */ + am62->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); + reg = dwc3_ti_readl(am62, USBSS_PHY_CONFIG); + if (am62->vbus_divider) + reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT; + + dwc3_ti_writel(am62, USBSS_PHY_CONFIG, reg); + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + /* + * Don't ignore its dependencies with its children + */ + pm_suspend_ignore_children(dev, false); + clk_prepare_enable(am62->usb2_refclk); + pm_runtime_get_noresume(dev); + + ret = of_platform_populate(node, NULL, NULL, dev); + if (ret) { + dev_err(dev, "failed to create dwc3 core: %d\n", ret); + goto err_pm_disable; + } + + /* Set mode valid bit to indicate role is valid */ + reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL); + reg |= USBSS_MODE_VALID; + dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg); + + /* Device has capability to wakeup system from sleep */ + device_set_wakeup_capable(dev, true); + ret = device_wakeup_enable(dev); + if (ret) + dev_err(dev, "couldn't enable device as a wakeup source: %d\n", ret); + + /* Setting up autosuspend */ + pm_runtime_set_autosuspend_delay(dev, DWC3_AM62_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + return 0; + +err_pm_disable: + clk_disable_unprepare(am62->usb2_refclk); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + return ret; +} + +static int dwc3_ti_remove_core(struct device *dev, void *c) +{ + struct platform_device *pdev = to_platform_device(dev); + + platform_device_unregister(pdev); + return 0; +} + +static void dwc3_ti_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dwc3_am62 *am62 = platform_get_drvdata(pdev); + u32 reg; + + device_for_each_child(dev, NULL, dwc3_ti_remove_core); + + /* Clear mode valid bit */ + reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL); + reg &= ~USBSS_MODE_VALID; + dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg); + + pm_runtime_put_sync(dev); + clk_disable_unprepare(am62->usb2_refclk); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); +} + +#ifdef CONFIG_PM +static int dwc3_ti_suspend_common(struct device *dev) +{ + struct dwc3_am62 *am62 = dev_get_drvdata(dev); + u32 reg, current_prtcap_dir; + + if (device_may_wakeup(dev)) { + reg = dwc3_ti_readl(am62, USBSS_CORE_STAT); + current_prtcap_dir = (reg & USBSS_CORE_OPERATIONAL_MODE_MASK) + >> USBSS_CORE_OPERATIONAL_MODE_SHIFT; + /* Set wakeup config enable bits */ + reg = dwc3_ti_readl(am62, USBSS_WAKEUP_CONFIG); + if (current_prtcap_dir == DWC3_GCTL_PRTCAP_HOST) { + reg = USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN; + } else { + reg = USBSS_WAKEUP_CFG_VBUSVALID_EN | USBSS_WAKEUP_CFG_SESSVALID_EN; + /* + * Enable LINESTATE wake up only if connected to bus + * and in U2/L3 state else it causes spurious wake-up. + */ + } + dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, reg); + /* clear wakeup status so we know what caused the wake up */ + dwc3_ti_writel(am62, USBSS_WAKEUP_STAT, USBSS_WAKEUP_STAT_CLR); + } + + clk_disable_unprepare(am62->usb2_refclk); + + return 0; +} + +static int dwc3_ti_resume_common(struct device *dev) +{ + struct dwc3_am62 *am62 = dev_get_drvdata(dev); + u32 reg; + + clk_prepare_enable(am62->usb2_refclk); + + if (device_may_wakeup(dev)) { + /* Clear wakeup config enable bits */ + dwc3_ti_writel(am62, USBSS_WAKEUP_CONFIG, USBSS_WAKEUP_CFG_NONE); + } + + reg = dwc3_ti_readl(am62, USBSS_WAKEUP_STAT); + am62->wakeup_stat = reg; + + return 0; +} + +static UNIVERSAL_DEV_PM_OPS(dwc3_ti_pm_ops, dwc3_ti_suspend_common, + dwc3_ti_resume_common, NULL); + +#define DEV_PM_OPS (&dwc3_ti_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif /* CONFIG_PM */ + +static const struct of_device_id dwc3_ti_of_match[] = { + { .compatible = "ti,am62-usb"}, + {}, +}; +MODULE_DEVICE_TABLE(of, dwc3_ti_of_match); + +static struct platform_driver dwc3_ti_driver = { + .probe = dwc3_ti_probe, + .remove_new = dwc3_ti_remove, + .driver = { + .name = "dwc3-am62", + .pm = DEV_PM_OPS, + .of_match_table = dwc3_ti_of_match, + }, +}; + +module_platform_driver(dwc3_ti_driver); + +MODULE_ALIAS("platform:dwc3-am62"); +MODULE_AUTHOR("Aswath Govindraju "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("DesignWare USB3 TI Glue Layer"); -- cgit v1.2.3