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364 lines
8.8 KiB
364 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/** |
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* dwc3-imx8mp.c - NXP imx8mp Specific Glue layer |
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* |
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* Copyright (c) 2020 NXP. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include "core.h" |
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/* USB wakeup registers */ |
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#define USB_WAKEUP_CTRL 0x00 |
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/* Global wakeup interrupt enable, also used to clear interrupt */ |
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#define USB_WAKEUP_EN BIT(31) |
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/* Wakeup from connect or disconnect, only for superspeed */ |
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#define USB_WAKEUP_SS_CONN BIT(5) |
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/* 0 select vbus_valid, 1 select sessvld */ |
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#define USB_WAKEUP_VBUS_SRC_SESS_VAL BIT(4) |
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/* Enable signal for wake up from u3 state */ |
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#define USB_WAKEUP_U3_EN BIT(3) |
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/* Enable signal for wake up from id change */ |
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#define USB_WAKEUP_ID_EN BIT(2) |
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/* Enable signal for wake up from vbus change */ |
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#define USB_WAKEUP_VBUS_EN BIT(1) |
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/* Enable signal for wake up from dp/dm change */ |
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#define USB_WAKEUP_DPDM_EN BIT(0) |
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#define USB_WAKEUP_EN_MASK GENMASK(5, 0) |
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struct dwc3_imx8mp { |
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struct device *dev; |
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struct platform_device *dwc3; |
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void __iomem *glue_base; |
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struct clk *hsio_clk; |
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struct clk *suspend_clk; |
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int irq; |
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bool pm_suspended; |
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bool wakeup_pending; |
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}; |
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static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx) |
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{ |
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struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3); |
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u32 val; |
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if (!dwc3) |
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return; |
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val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); |
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if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) |
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val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN | |
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USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN; |
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else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) |
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val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN | |
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USB_WAKEUP_VBUS_SRC_SESS_VAL; |
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writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); |
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} |
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static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx) |
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{ |
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u32 val; |
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val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); |
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val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK); |
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writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); |
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} |
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static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = _dwc3_imx; |
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struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); |
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if (!dwc3_imx->pm_suspended) |
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return IRQ_HANDLED; |
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disable_irq_nosync(dwc3_imx->irq); |
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dwc3_imx->wakeup_pending = true; |
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if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci) |
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pm_runtime_resume(&dwc->xhci->dev); |
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else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) |
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pm_runtime_get(dwc->dev); |
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return IRQ_HANDLED; |
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} |
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static int dwc3_imx8mp_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *dwc3_np, *node = dev->of_node; |
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struct dwc3_imx8mp *dwc3_imx; |
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int err, irq; |
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if (!node) { |
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dev_err(dev, "device node not found\n"); |
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return -EINVAL; |
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} |
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dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL); |
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if (!dwc3_imx) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, dwc3_imx); |
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dwc3_imx->dev = dev; |
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dwc3_imx->glue_base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(dwc3_imx->glue_base)) |
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return PTR_ERR(dwc3_imx->glue_base); |
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dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio"); |
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if (IS_ERR(dwc3_imx->hsio_clk)) { |
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err = PTR_ERR(dwc3_imx->hsio_clk); |
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dev_err(dev, "Failed to get hsio clk, err=%d\n", err); |
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return err; |
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} |
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err = clk_prepare_enable(dwc3_imx->hsio_clk); |
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if (err) { |
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dev_err(dev, "Failed to enable hsio clk, err=%d\n", err); |
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return err; |
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} |
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dwc3_imx->suspend_clk = devm_clk_get(dev, "suspend"); |
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if (IS_ERR(dwc3_imx->suspend_clk)) { |
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err = PTR_ERR(dwc3_imx->suspend_clk); |
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dev_err(dev, "Failed to get suspend clk, err=%d\n", err); |
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goto disable_hsio_clk; |
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} |
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err = clk_prepare_enable(dwc3_imx->suspend_clk); |
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if (err) { |
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dev_err(dev, "Failed to enable suspend clk, err=%d\n", err); |
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goto disable_hsio_clk; |
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} |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) { |
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err = irq; |
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goto disable_clks; |
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} |
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dwc3_imx->irq = irq; |
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err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt, |
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IRQF_ONESHOT, dev_name(dev), dwc3_imx); |
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if (err) { |
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dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err); |
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goto disable_clks; |
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} |
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pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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err = pm_runtime_get_sync(dev); |
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if (err < 0) |
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goto disable_rpm; |
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dwc3_np = of_get_child_by_name(node, "dwc3"); |
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if (!dwc3_np) { |
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err = -ENODEV; |
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dev_err(dev, "failed to find dwc3 core child\n"); |
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goto disable_rpm; |
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} |
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err = of_platform_populate(node, NULL, NULL, dev); |
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if (err) { |
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dev_err(&pdev->dev, "failed to create dwc3 core\n"); |
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goto err_node_put; |
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} |
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dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np); |
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if (!dwc3_imx->dwc3) { |
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dev_err(dev, "failed to get dwc3 platform device\n"); |
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err = -ENODEV; |
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goto depopulate; |
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} |
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of_node_put(dwc3_np); |
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device_set_wakeup_capable(dev, true); |
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pm_runtime_put(dev); |
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return 0; |
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depopulate: |
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of_platform_depopulate(dev); |
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err_node_put: |
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of_node_put(dwc3_np); |
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disable_rpm: |
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pm_runtime_disable(dev); |
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pm_runtime_put_noidle(dev); |
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disable_clks: |
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clk_disable_unprepare(dwc3_imx->suspend_clk); |
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disable_hsio_clk: |
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clk_disable_unprepare(dwc3_imx->hsio_clk); |
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return err; |
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} |
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static int dwc3_imx8mp_remove(struct platform_device *pdev) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev); |
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struct device *dev = &pdev->dev; |
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pm_runtime_get_sync(dev); |
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of_platform_depopulate(dev); |
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clk_disable_unprepare(dwc3_imx->suspend_clk); |
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clk_disable_unprepare(dwc3_imx->hsio_clk); |
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pm_runtime_disable(dev); |
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pm_runtime_put_noidle(dev); |
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platform_set_drvdata(pdev, NULL); |
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return 0; |
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} |
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static int __maybe_unused dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, |
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pm_message_t msg) |
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{ |
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if (dwc3_imx->pm_suspended) |
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return 0; |
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/* Wakeup enable */ |
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if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev)) |
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dwc3_imx8mp_wakeup_enable(dwc3_imx); |
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dwc3_imx->pm_suspended = true; |
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return 0; |
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} |
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static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, |
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pm_message_t msg) |
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{ |
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struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); |
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int ret = 0; |
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if (!dwc3_imx->pm_suspended) |
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return 0; |
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/* Wakeup disable */ |
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dwc3_imx8mp_wakeup_disable(dwc3_imx); |
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dwc3_imx->pm_suspended = false; |
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if (dwc3_imx->wakeup_pending) { |
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dwc3_imx->wakeup_pending = false; |
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if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) { |
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pm_runtime_mark_last_busy(dwc->dev); |
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pm_runtime_put_autosuspend(dwc->dev); |
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} else { |
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/* |
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* Add wait for xhci switch from suspend |
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* clock to normal clock to detect connection. |
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*/ |
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usleep_range(9000, 10000); |
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} |
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enable_irq(dwc3_imx->irq); |
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} |
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return ret; |
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} |
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static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); |
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int ret; |
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ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND); |
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if (device_may_wakeup(dwc3_imx->dev)) |
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enable_irq_wake(dwc3_imx->irq); |
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else |
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clk_disable_unprepare(dwc3_imx->suspend_clk); |
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clk_disable_unprepare(dwc3_imx->hsio_clk); |
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dev_dbg(dev, "dwc3 imx8mp pm suspend.\n"); |
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return ret; |
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} |
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static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); |
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int ret; |
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if (device_may_wakeup(dwc3_imx->dev)) { |
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disable_irq_wake(dwc3_imx->irq); |
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} else { |
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ret = clk_prepare_enable(dwc3_imx->suspend_clk); |
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if (ret) |
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return ret; |
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} |
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ret = clk_prepare_enable(dwc3_imx->hsio_clk); |
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if (ret) |
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return ret; |
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ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME); |
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pm_runtime_disable(dev); |
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pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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dev_dbg(dev, "dwc3 imx8mp pm resume.\n"); |
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return ret; |
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} |
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static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); |
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dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n"); |
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return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND); |
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} |
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static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev) |
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{ |
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struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); |
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dev_dbg(dev, "dwc3 imx8mp runtime resume.\n"); |
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return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME); |
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} |
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static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume) |
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SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend, |
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dwc3_imx8mp_runtime_resume, NULL) |
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}; |
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static const struct of_device_id dwc3_imx8mp_of_match[] = { |
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{ .compatible = "fsl,imx8mp-dwc3", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match); |
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static struct platform_driver dwc3_imx8mp_driver = { |
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.probe = dwc3_imx8mp_probe, |
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.remove = dwc3_imx8mp_remove, |
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.driver = { |
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.name = "imx8mp-dwc3", |
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.pm = &dwc3_imx8mp_dev_pm_ops, |
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.of_match_table = dwc3_imx8mp_of_match, |
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}, |
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}; |
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module_platform_driver(dwc3_imx8mp_driver); |
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MODULE_ALIAS("platform:imx8mp-dwc3"); |
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MODULE_AUTHOR("[email protected]"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");
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