diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-imx8mp.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-imx8mp.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c new file mode 100644 index 0000000000..a1e15f2fff --- /dev/null +++ b/drivers/usb/dwc3/dwc3-imx8mp.c @@ -0,0 +1,425 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dwc3-imx8mp.c - NXP imx8mp Specific Glue layer + * + * Copyright (c) 2020 NXP. + */ + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +#include "core.h" + +/* USB wakeup registers */ +#define USB_WAKEUP_CTRL 0x00 + +/* Global wakeup interrupt enable, also used to clear interrupt */ +#define USB_WAKEUP_EN BIT(31) +/* Wakeup from connect or disconnect, only for superspeed */ +#define USB_WAKEUP_SS_CONN BIT(5) +/* 0 select vbus_valid, 1 select sessvld */ +#define USB_WAKEUP_VBUS_SRC_SESS_VAL BIT(4) +/* Enable signal for wake up from u3 state */ +#define USB_WAKEUP_U3_EN BIT(3) +/* Enable signal for wake up from id change */ +#define USB_WAKEUP_ID_EN BIT(2) +/* Enable signal for wake up from vbus change */ +#define USB_WAKEUP_VBUS_EN BIT(1) +/* Enable signal for wake up from dp/dm change */ +#define USB_WAKEUP_DPDM_EN BIT(0) + +#define USB_WAKEUP_EN_MASK GENMASK(5, 0) + +/* USB glue registers */ +#define USB_CTRL0 0x00 +#define USB_CTRL1 0x04 + +#define USB_CTRL0_PORTPWR_EN BIT(12) /* 1 - PPC enabled (default) */ +#define USB_CTRL0_USB3_FIXED BIT(22) /* 1 - USB3 permanent attached */ +#define USB_CTRL0_USB2_FIXED BIT(23) /* 1 - USB2 permanent attached */ + +#define USB_CTRL1_OC_POLARITY BIT(16) /* 0 - HIGH / 1 - LOW */ +#define USB_CTRL1_PWR_POLARITY BIT(17) /* 0 - HIGH / 1 - LOW */ + +struct dwc3_imx8mp { + struct device *dev; + struct platform_device *dwc3; + void __iomem *hsio_blk_base; + void __iomem *glue_base; + struct clk *hsio_clk; + struct clk *suspend_clk; + int irq; + bool pm_suspended; + bool wakeup_pending; +}; + +static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx) +{ + struct device *dev = dwc3_imx->dev; + u32 value; + + if (!dwc3_imx->glue_base) + return; + + value = readl(dwc3_imx->glue_base + USB_CTRL0); + + if (device_property_read_bool(dev, "fsl,permanently-attached")) + value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED); + else + value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED); + + if (device_property_read_bool(dev, "fsl,disable-port-power-control")) + value &= ~(USB_CTRL0_PORTPWR_EN); + else + value |= USB_CTRL0_PORTPWR_EN; + + writel(value, dwc3_imx->glue_base + USB_CTRL0); + + value = readl(dwc3_imx->glue_base + USB_CTRL1); + if (device_property_read_bool(dev, "fsl,over-current-active-low")) + value |= USB_CTRL1_OC_POLARITY; + else + value &= ~USB_CTRL1_OC_POLARITY; + + if (device_property_read_bool(dev, "fsl,power-active-low")) + value |= USB_CTRL1_PWR_POLARITY; + else + value &= ~USB_CTRL1_PWR_POLARITY; + + writel(value, dwc3_imx->glue_base + USB_CTRL1); +} + +static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx) +{ + struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3); + u32 val; + + if (!dwc3) + return; + + val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); + + if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) + val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN | + USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN; + else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) + val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN | + USB_WAKEUP_VBUS_SRC_SESS_VAL; + + writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); +} + +static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx) +{ + u32 val; + + val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); + val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK); + writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); +} + +static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx) +{ + struct dwc3_imx8mp *dwc3_imx = _dwc3_imx; + struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); + + if (!dwc3_imx->pm_suspended) + return IRQ_HANDLED; + + disable_irq_nosync(dwc3_imx->irq); + dwc3_imx->wakeup_pending = true; + + if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci) + pm_runtime_resume(&dwc->xhci->dev); + else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) + pm_runtime_get(dwc->dev); + + return IRQ_HANDLED; +} + +static int dwc3_imx8mp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *dwc3_np, *node = dev->of_node; + struct dwc3_imx8mp *dwc3_imx; + struct resource *res; + int err, irq; + + if (!node) { + dev_err(dev, "device node not found\n"); + return -EINVAL; + } + + dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL); + if (!dwc3_imx) + return -ENOMEM; + + platform_set_drvdata(pdev, dwc3_imx); + + dwc3_imx->dev = dev; + + dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dwc3_imx->hsio_blk_base)) + return PTR_ERR(dwc3_imx->hsio_blk_base); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though."); + } else { + dwc3_imx->glue_base = devm_ioremap_resource(dev, res); + if (IS_ERR(dwc3_imx->glue_base)) + return PTR_ERR(dwc3_imx->glue_base); + } + + dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio"); + if (IS_ERR(dwc3_imx->hsio_clk)) { + err = PTR_ERR(dwc3_imx->hsio_clk); + dev_err(dev, "Failed to get hsio clk, err=%d\n", err); + return err; + } + + err = clk_prepare_enable(dwc3_imx->hsio_clk); + if (err) { + dev_err(dev, "Failed to enable hsio clk, err=%d\n", err); + return err; + } + + dwc3_imx->suspend_clk = devm_clk_get(dev, "suspend"); + if (IS_ERR(dwc3_imx->suspend_clk)) { + err = PTR_ERR(dwc3_imx->suspend_clk); + dev_err(dev, "Failed to get suspend clk, err=%d\n", err); + goto disable_hsio_clk; + } + + err = clk_prepare_enable(dwc3_imx->suspend_clk); + if (err) { + dev_err(dev, "Failed to enable suspend clk, err=%d\n", err); + goto disable_hsio_clk; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + err = irq; + goto disable_clks; + } + dwc3_imx->irq = irq; + + imx8mp_configure_glue(dwc3_imx); + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + err = pm_runtime_get_sync(dev); + if (err < 0) + goto disable_rpm; + + dwc3_np = of_get_compatible_child(node, "snps,dwc3"); + if (!dwc3_np) { + err = -ENODEV; + dev_err(dev, "failed to find dwc3 core child\n"); + goto disable_rpm; + } + + err = of_platform_populate(node, NULL, NULL, dev); + if (err) { + dev_err(&pdev->dev, "failed to create dwc3 core\n"); + goto err_node_put; + } + + dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np); + if (!dwc3_imx->dwc3) { + dev_err(dev, "failed to get dwc3 platform device\n"); + err = -ENODEV; + goto depopulate; + } + of_node_put(dwc3_np); + + err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt, + IRQF_ONESHOT, dev_name(dev), dwc3_imx); + if (err) { + dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err); + goto depopulate; + } + + device_set_wakeup_capable(dev, true); + pm_runtime_put(dev); + + return 0; + +depopulate: + of_platform_depopulate(dev); +err_node_put: + of_node_put(dwc3_np); +disable_rpm: + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); +disable_clks: + clk_disable_unprepare(dwc3_imx->suspend_clk); +disable_hsio_clk: + clk_disable_unprepare(dwc3_imx->hsio_clk); + + return err; +} + +static void dwc3_imx8mp_remove(struct platform_device *pdev) +{ + struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + pm_runtime_get_sync(dev); + of_platform_depopulate(dev); + + clk_disable_unprepare(dwc3_imx->suspend_clk); + clk_disable_unprepare(dwc3_imx->hsio_clk); + + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); +} + +static int __maybe_unused dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, + pm_message_t msg) +{ + if (dwc3_imx->pm_suspended) + return 0; + + /* Wakeup enable */ + if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev)) + dwc3_imx8mp_wakeup_enable(dwc3_imx); + + dwc3_imx->pm_suspended = true; + + return 0; +} + +static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, + pm_message_t msg) +{ + struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); + int ret = 0; + + if (!dwc3_imx->pm_suspended) + return 0; + + /* Wakeup disable */ + dwc3_imx8mp_wakeup_disable(dwc3_imx); + dwc3_imx->pm_suspended = false; + + /* Upon power loss any previous configuration is lost, restore it */ + imx8mp_configure_glue(dwc3_imx); + + if (dwc3_imx->wakeup_pending) { + dwc3_imx->wakeup_pending = false; + if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) { + pm_runtime_mark_last_busy(dwc->dev); + pm_runtime_put_autosuspend(dwc->dev); + } else { + /* + * Add wait for xhci switch from suspend + * clock to normal clock to detect connection. + */ + usleep_range(9000, 10000); + } + enable_irq(dwc3_imx->irq); + } + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + int ret; + + ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND); + + if (device_may_wakeup(dwc3_imx->dev)) + enable_irq_wake(dwc3_imx->irq); + else + clk_disable_unprepare(dwc3_imx->suspend_clk); + + clk_disable_unprepare(dwc3_imx->hsio_clk); + dev_dbg(dev, "dwc3 imx8mp pm suspend.\n"); + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + int ret; + + if (device_may_wakeup(dwc3_imx->dev)) { + disable_irq_wake(dwc3_imx->irq); + } else { + ret = clk_prepare_enable(dwc3_imx->suspend_clk); + if (ret) + return ret; + } + + ret = clk_prepare_enable(dwc3_imx->hsio_clk); + if (ret) + return ret; + + ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME); + + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + dev_dbg(dev, "dwc3 imx8mp pm resume.\n"); + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + + dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n"); + + return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND); +} + +static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + + dev_dbg(dev, "dwc3 imx8mp runtime resume.\n"); + + return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME); +} + +static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume) + SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend, + dwc3_imx8mp_runtime_resume, NULL) +}; + +static const struct of_device_id dwc3_imx8mp_of_match[] = { + { .compatible = "fsl,imx8mp-dwc3", }, + {}, +}; +MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match); + +static struct platform_driver dwc3_imx8mp_driver = { + .probe = dwc3_imx8mp_probe, + .remove_new = dwc3_imx8mp_remove, + .driver = { + .name = "imx8mp-dwc3", + .pm = &dwc3_imx8mp_dev_pm_ops, + .of_match_table = dwc3_imx8mp_of_match, + }, +}; + +module_platform_driver(dwc3_imx8mp_driver); + +MODULE_ALIAS("platform:imx8mp-dwc3"); +MODULE_AUTHOR("jun.li@nxp.com"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer"); |