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	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 83	if (IS_ERR(hcd->regs)) {
 84		retval = PTR_ERR(hcd->regs);
 85		goto err_put_hcd;
 86	}
 87	hcd->rsrc_start = res->start;
 88	hcd->rsrc_len = resource_size(res);
 89
 90	/* registers start at offset 0x0 */
 91	hcd_to_ehci(hcd)->caps = hcd->regs;
 92
 93	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 94	if (retval)
 95		goto err_put_hcd;
 96
 97	device_wakeup_enable(hcd->self.controller);
 98	return retval;
 99
100err_put_hcd:
101	usb_put_hcd(hcd);
102fail:
103	dev_err(&pdev->dev, "init fail, %d\n", retval);
104
105	return retval;
106}
107
108static void npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
109{
110	struct usb_hcd *hcd = platform_get_drvdata(pdev);
111
112	usb_remove_hcd(hcd);
113
114	usb_put_hcd(hcd);
115}
116
117static const struct of_device_id npcm7xx_ehci_id_table[] = {
118	{ .compatible = "nuvoton,npcm750-ehci" },
119	{ },
120};
121MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
122
123static struct platform_driver npcm7xx_ehci_hcd_driver = {
124	.probe		= npcm7xx_ehci_hcd_drv_probe,
125	.remove_new	= npcm7xx_ehci_hcd_drv_remove,
126	.shutdown	= usb_hcd_platform_shutdown,
127	.driver		= {
128		.name = "npcm7xx-ehci",
129		.bus = &platform_bus_type,
130		.pm = pm_ptr(&ehci_npcm7xx_pm_ops),
131		.of_match_table = npcm7xx_ehci_id_table,
132	}
133};
134
135static int __init ehci_npcm7xx_init(void)
136{
137	if (usb_disabled())
138		return -ENODEV;
139
140	ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
141	return platform_driver_register(&npcm7xx_ehci_hcd_driver);
142}
143module_init(ehci_npcm7xx_init);
144
145static void __exit ehci_npcm7xx_cleanup(void)
146{
147	platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
148}
149module_exit(ehci_npcm7xx_cleanup);
150
151MODULE_DESCRIPTION(DRIVER_DESC);
152MODULE_ALIAS("platform:npcm7xx-ehci");
153MODULE_AUTHOR("Avi Fishman");
154MODULE_LICENSE("GPL v2");