1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Nuvoton NPCM7xx driver for EHCI HCD
  4 *
  5 * Copyright (C) 2018 Nuvoton Technologies,
  6 * Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
  7 * Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
  8 *
  9 * Based on various ehci-spear.c driver
 10 */
 11
 12
 13#include <linux/dma-mapping.h>
 14
 15#include <linux/kernel.h>
 16#include <linux/module.h>
 17#include <linux/of.h>
 18#include <linux/platform_device.h>
 19#include <linux/pm.h>
 20#include <linux/usb.h>
 21#include <linux/usb/hcd.h>
 22
 23#include "ehci.h"
 24
 25#define DRIVER_DESC "EHCI npcm7xx driver"
 26
 27static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
 28
 29static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev)
 30{
 31	struct usb_hcd *hcd = dev_get_drvdata(dev);
 32	bool do_wakeup = device_may_wakeup(dev);
 33
 34	return ehci_suspend(hcd, do_wakeup);
 35}
 36
 37static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev)
 38{
 39	struct usb_hcd *hcd = dev_get_drvdata(dev);
 40
 41	ehci_resume(hcd, false);
 42	return 0;
 43}
 44
 45static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
 46		ehci_npcm7xx_drv_resume);
 47
 48static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
 49{
 50	struct usb_hcd *hcd;
 51	struct resource *res;
 52	const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
 53	int irq;
 54	int retval;
 55
 56	dev_dbg(&pdev->dev,	"initializing npcm7xx ehci USB Controller\n");
 57
 58	if (usb_disabled())
 59		return -ENODEV;
 60
 61	irq = platform_get_irq(pdev, 0);
 62	if (irq < 0) {
 63		retval = irq;
 64		goto fail;
 65	}
 66
 67	/*
 68	 * Right now device-tree probed devices don't get dma_mask set.
 69	 * Since shared usb code relies on it, set it here for now.
 70	 * Once we have dma capability bindings this can go away.
 71	 */
 72	retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 73	if (retval)
 74		goto fail;
 75
 76	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 77	if (!hcd) {
 78		retval = -ENOMEM;
 79		goto fail;
 80	}
 81
 82	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 83	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 84	if (IS_ERR(hcd->regs)) {
 85		retval = PTR_ERR(hcd->regs);
 86		goto err_put_hcd;
 87	}
 88	hcd->rsrc_start = res->start;
 89	hcd->rsrc_len = resource_size(res);
 90
 91	/* registers start at offset 0x0 */
 92	hcd_to_ehci(hcd)->caps = hcd->regs;
 93
 94	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 95	if (retval)
 96		goto err_put_hcd;
 97
 98	device_wakeup_enable(hcd->self.controller);
 99	return retval;
100
101err_put_hcd:
102	usb_put_hcd(hcd);
103fail:
104	dev_err(&pdev->dev, "init fail, %d\n", retval);
105
106	return retval;
107}
108
109static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
110{
111	struct usb_hcd *hcd = platform_get_drvdata(pdev);
112
113	usb_remove_hcd(hcd);
114
115	usb_put_hcd(hcd);
116
117	return 0;
118}
119
120static const struct of_device_id npcm7xx_ehci_id_table[] = {
121	{ .compatible = "nuvoton,npcm750-ehci" },
122	{ },
123};
124MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
125
126static struct platform_driver npcm7xx_ehci_hcd_driver = {
127	.probe		= npcm7xx_ehci_hcd_drv_probe,
128	.remove		= npcm7xx_ehci_hcd_drv_remove,
129	.shutdown	= usb_hcd_platform_shutdown,
130	.driver		= {
131		.name = "npcm7xx-ehci",
132		.bus = &platform_bus_type,
133		.pm = pm_ptr(&ehci_npcm7xx_pm_ops),
134		.of_match_table = npcm7xx_ehci_id_table,
135	}
136};
137
138static int __init ehci_npcm7xx_init(void)
139{
140	if (usb_disabled())
141		return -ENODEV;
142
143	ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
144	return platform_driver_register(&npcm7xx_ehci_hcd_driver);
145}
146module_init(ehci_npcm7xx_init);
147
148static void __exit ehci_npcm7xx_cleanup(void)
149{
150	platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
151}
152module_exit(ehci_npcm7xx_cleanup);
153
154MODULE_DESCRIPTION(DRIVER_DESC);
155MODULE_ALIAS("platform:npcm7xx-ehci");
156MODULE_AUTHOR("Avi Fishman");
157MODULE_LICENSE("GPL v2");