forked from Minki/linux
1c11e74e90
The Local Power Sleep Controller (LPSC) dependency on AM65 requires SERDES0 to be powered on before USB. We need to power up SERDES0 power domain and hold it on throughout the reset, init, power on sequence. Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
232 lines
5.4 KiB
C
232 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/**
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* dwc3-keystone.c - Keystone Specific Glue layer
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*
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* Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: WingMan Kwok <w-kwok2@ti.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/of_platform.h>
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#include <linux/phy/phy.h>
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#include <linux/pm_runtime.h>
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/* USBSS register offsets */
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#define USBSS_REVISION 0x0000
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#define USBSS_SYSCONFIG 0x0010
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#define USBSS_IRQ_EOI 0x0018
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#define USBSS_IRQSTATUS_RAW_0 0x0020
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#define USBSS_IRQSTATUS_0 0x0024
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#define USBSS_IRQENABLE_SET_0 0x0028
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#define USBSS_IRQENABLE_CLR_0 0x002c
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/* IRQ register bits */
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#define USBSS_IRQ_EOI_LINE(n) BIT(n)
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#define USBSS_IRQ_EVENT_ST BIT(0)
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#define USBSS_IRQ_COREIRQ_EN BIT(0)
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#define USBSS_IRQ_COREIRQ_CLR BIT(0)
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struct dwc3_keystone {
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struct device *dev;
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void __iomem *usbss;
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struct phy *usb3_phy;
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};
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static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
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{
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return readl(base + offset);
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}
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static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
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{
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writel(value, base + offset);
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}
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static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
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{
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u32 val;
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val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
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val |= USBSS_IRQ_COREIRQ_EN;
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
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}
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static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
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{
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u32 val;
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val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
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val &= ~USBSS_IRQ_COREIRQ_EN;
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
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}
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static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
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{
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struct dwc3_keystone *kdwc = _kdwc;
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
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kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
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kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
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kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
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return IRQ_HANDLED;
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}
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static int kdwc3_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 *node = pdev->dev.of_node;
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struct dwc3_keystone *kdwc;
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int error, irq;
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kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
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if (!kdwc)
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return -ENOMEM;
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platform_set_drvdata(pdev, kdwc);
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kdwc->dev = dev;
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kdwc->usbss = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(kdwc->usbss))
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return PTR_ERR(kdwc->usbss);
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/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
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kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
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if (IS_ERR(kdwc->usb3_phy)) {
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error = PTR_ERR(kdwc->usb3_phy);
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if (error != -EPROBE_DEFER)
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dev_err(dev, "couldn't get usb3 phy: %d\n", error);
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return error;
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}
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phy_pm_runtime_get_sync(kdwc->usb3_phy);
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error = phy_reset(kdwc->usb3_phy);
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if (error < 0) {
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dev_err(dev, "usb3 phy reset failed: %d\n", error);
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return error;
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}
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error = phy_init(kdwc->usb3_phy);
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if (error < 0) {
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dev_err(dev, "usb3 phy init failed: %d\n", error);
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return error;
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}
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error = phy_power_on(kdwc->usb3_phy);
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if (error < 0) {
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dev_err(dev, "usb3 phy power on failed: %d\n", error);
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phy_exit(kdwc->usb3_phy);
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return error;
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}
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pm_runtime_enable(kdwc->dev);
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error = pm_runtime_get_sync(kdwc->dev);
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if (error < 0) {
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dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
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error);
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goto err_irq;
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}
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/* IRQ processing not required currently for AM65 */
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if (of_device_is_compatible(node, "ti,am654-dwc3"))
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goto skip_irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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error = irq;
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goto err_irq;
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}
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error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
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dev_name(dev), kdwc);
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if (error) {
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dev_err(dev, "failed to request IRQ #%d --> %d\n",
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irq, error);
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goto err_irq;
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}
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kdwc3_enable_irqs(kdwc);
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skip_irq:
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error = of_platform_populate(node, NULL, NULL, dev);
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if (error) {
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dev_err(&pdev->dev, "failed to create dwc3 core\n");
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goto err_core;
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}
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return 0;
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err_core:
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kdwc3_disable_irqs(kdwc);
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err_irq:
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pm_runtime_put_sync(kdwc->dev);
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pm_runtime_disable(kdwc->dev);
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phy_power_off(kdwc->usb3_phy);
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phy_exit(kdwc->usb3_phy);
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phy_pm_runtime_put_sync(kdwc->usb3_phy);
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return error;
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}
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static int kdwc3_remove_core(struct device *dev, void *c)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int kdwc3_remove(struct platform_device *pdev)
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{
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struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
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struct device_node *node = pdev->dev.of_node;
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if (!of_device_is_compatible(node, "ti,am654-dwc3"))
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kdwc3_disable_irqs(kdwc);
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device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
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pm_runtime_put_sync(kdwc->dev);
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pm_runtime_disable(kdwc->dev);
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phy_power_off(kdwc->usb3_phy);
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phy_exit(kdwc->usb3_phy);
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phy_pm_runtime_put_sync(kdwc->usb3_phy);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static const struct of_device_id kdwc3_of_match[] = {
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{ .compatible = "ti,keystone-dwc3", },
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{ .compatible = "ti,am654-dwc3" },
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{},
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};
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MODULE_DEVICE_TABLE(of, kdwc3_of_match);
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static struct platform_driver kdwc3_driver = {
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.probe = kdwc3_probe,
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.remove = kdwc3_remove,
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.driver = {
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.name = "keystone-dwc3",
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.of_match_table = kdwc3_of_match,
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},
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};
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module_platform_driver(kdwc3_driver);
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MODULE_ALIAS("platform:keystone-dwc3");
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MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
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