428 lines
11 KiB
C
428 lines
11 KiB
C
// 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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/* USB glue registers */
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#define USB_CTRL0 0x00
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#define USB_CTRL1 0x04
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#define USB_CTRL0_PORTPWR_EN BIT(12) /* 1 - PPC enabled (default) */
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#define USB_CTRL0_USB3_FIXED BIT(22) /* 1 - USB3 permanent attached */
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#define USB_CTRL0_USB2_FIXED BIT(23) /* 1 - USB2 permanent attached */
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#define USB_CTRL1_OC_POLARITY BIT(16) /* 0 - HIGH / 1 - LOW */
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#define USB_CTRL1_PWR_POLARITY BIT(17) /* 0 - HIGH / 1 - LOW */
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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 *hsio_blk_base;
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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 imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
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{
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struct device *dev = dwc3_imx->dev;
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u32 value;
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if (!dwc3_imx->glue_base)
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return;
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value = readl(dwc3_imx->glue_base + USB_CTRL0);
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if (device_property_read_bool(dev, "fsl,permanently-attached"))
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value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
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else
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value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
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if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
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value &= ~(USB_CTRL0_PORTPWR_EN);
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else
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value |= USB_CTRL0_PORTPWR_EN;
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writel(value, dwc3_imx->glue_base + USB_CTRL0);
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value = readl(dwc3_imx->glue_base + USB_CTRL1);
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if (device_property_read_bool(dev, "fsl,over-current-active-low"))
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value |= USB_CTRL1_OC_POLARITY;
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else
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value &= ~USB_CTRL1_OC_POLARITY;
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if (device_property_read_bool(dev, "fsl,power-active-low"))
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value |= USB_CTRL1_PWR_POLARITY;
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else
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value &= ~USB_CTRL1_PWR_POLARITY;
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writel(value, dwc3_imx->glue_base + USB_CTRL1);
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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->hsio_blk_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->hsio_blk_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->hsio_blk_base + USB_WAKEUP_CTRL);
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val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
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writel(val, dwc3_imx->hsio_blk_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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struct resource *res;
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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->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(dwc3_imx->hsio_blk_base))
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return PTR_ERR(dwc3_imx->hsio_blk_base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res) {
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dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
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} else {
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dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
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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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}
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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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imx8mp_configure_glue(dwc3_imx);
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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_compatible_child(node, "snps,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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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 depopulate;
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}
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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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/* Upon power loss any previous configuration is lost, restore it */
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imx8mp_configure_glue(dwc3_imx);
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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("jun.li@nxp.com");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");
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