1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic UHCI HCD (Host Controller Driver) for Platform Devices
4 *
5 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
6 *
7 * This file is based on uhci-grlib.c
8 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
9 */
10
11#include <linux/of.h>
12#include <linux/device.h>
13#include <linux/platform_device.h>
14
15static int uhci_platform_init(struct usb_hcd *hcd)
16{
17	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
18
19	/* Probe number of ports if not already provided by DT */
20	if (!uhci->rh_numports)
21		uhci->rh_numports = uhci_count_ports(hcd);
22
23	/* Set up pointers to to generic functions */
24	uhci->reset_hc = uhci_generic_reset_hc;
25	uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
26
27	/* No special actions need to be taken for the functions below */
28	uhci->configure_hc = NULL;
29	uhci->resume_detect_interrupts_are_broken = NULL;
30	uhci->global_suspend_mode_is_broken = NULL;
31
32	/* Reset if the controller isn't already safely quiescent. */
33	check_and_reset_hc(uhci);
34	return 0;
35}
36
37static const struct hc_driver uhci_platform_hc_driver = {
38	.description =		hcd_name,
39	.product_desc =		"Generic UHCI Host Controller",
40	.hcd_priv_size =	sizeof(struct uhci_hcd),
41
42	/* Generic hardware linkage */
43	.irq =			uhci_irq,
44	.flags =		HCD_MEMORY | HCD_DMA | HCD_USB11,
45
46	/* Basic lifecycle operations */
47	.reset =		uhci_platform_init,
48	.start =		uhci_start,
49#ifdef CONFIG_PM
50	.pci_suspend =		NULL,
51	.pci_resume =		NULL,
52	.bus_suspend =		uhci_rh_suspend,
53	.bus_resume =		uhci_rh_resume,
54#endif
55	.stop =			uhci_stop,
56
57	.urb_enqueue =		uhci_urb_enqueue,
58	.urb_dequeue =		uhci_urb_dequeue,
59
60	.endpoint_disable =	uhci_hcd_endpoint_disable,
61	.get_frame_number =	uhci_hcd_get_frame_number,
62
63	.hub_status_data =	uhci_hub_status_data,
64	.hub_control =		uhci_hub_control,
65};
66
67static int uhci_hcd_platform_probe(struct platform_device *pdev)
68{
69	struct device_node *np = pdev->dev.of_node;
70	struct usb_hcd *hcd;
71	struct uhci_hcd	*uhci;
72	struct resource *res;
73	int ret;
74
75	if (usb_disabled())
76		return -ENODEV;
77
78	/*
79	 * Right now device-tree probed devices don't get dma_mask set.
80	 * Since shared usb code relies on it, set it here for now.
81	 * Once we have dma capability bindings this can go away.
82	 */
83	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
84	if (ret)
85		return ret;
86
87	hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
88			pdev->name);
89	if (!hcd)
90		return -ENOMEM;
91
92	uhci = hcd_to_uhci(hcd);
93
94	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
95	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
96	if (IS_ERR(hcd->regs)) {
97		ret = PTR_ERR(hcd->regs);
98		goto err_rmr;
99	}
100	hcd->rsrc_start = res->start;
101	hcd->rsrc_len = resource_size(res);
102
103	uhci->regs = hcd->regs;
104
105	/* Grab some things from the device-tree */
106	if (np) {
107		u32 num_ports;
108
109		if (of_property_read_u32(np, "#ports", &num_ports) == 0) {
110			uhci->rh_numports = num_ports;
111			dev_info(&pdev->dev,
112				"Detected %d ports from device-tree\n",
113				num_ports);
114		}
115		if (of_device_is_compatible(np, "aspeed,ast2400-uhci") ||
116		    of_device_is_compatible(np, "aspeed,ast2500-uhci") ||
117		    of_device_is_compatible(np, "aspeed,ast2600-uhci")) {
118			uhci->is_aspeed = 1;
119			dev_info(&pdev->dev,
120				 "Enabled Aspeed implementation workarounds\n");
121		}
122	}
123
124	/* Get and enable clock if any specified */
125	uhci->clk = devm_clk_get(&pdev->dev, NULL);
126	if (IS_ERR(uhci->clk)) {
127		ret = PTR_ERR(uhci->clk);
128		goto err_rmr;
129	}
130	ret = clk_prepare_enable(uhci->clk);
131	if (ret) {
132		dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
133		goto err_rmr;
134	}
135
136	ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
137	if (ret)
138		goto err_clk;
139
140	device_wakeup_enable(hcd->self.controller);
141	return 0;
142
143err_clk:
144	clk_disable_unprepare(uhci->clk);
145err_rmr:
146	usb_put_hcd(hcd);
147
148	return ret;
149}
150
151static int uhci_hcd_platform_remove(struct platform_device *pdev)
152{
153	struct usb_hcd *hcd = platform_get_drvdata(pdev);
154	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
155
156	clk_disable_unprepare(uhci->clk);
157	usb_remove_hcd(hcd);
158	usb_put_hcd(hcd);
159
160	return 0;
161}
162
163/* Make sure the controller is quiescent and that we're not using it
164 * any more.  This is mainly for the benefit of programs which, like kexec,
165 * expect the hardware to be idle: not doing DMA or generating IRQs.
166 *
167 * This routine may be called in a damaged or failing kernel.  Hence we
168 * do not acquire the spinlock before shutting down the controller.
169 */
170static void uhci_hcd_platform_shutdown(struct platform_device *op)
171{
172	struct usb_hcd *hcd = platform_get_drvdata(op);
173
174	uhci_hc_died(hcd_to_uhci(hcd));
175}
176
177static const struct of_device_id platform_uhci_ids[] = {
178	{ .compatible = "generic-uhci", },
179	{ .compatible = "platform-uhci", },
180	{}
181};
182MODULE_DEVICE_TABLE(of, platform_uhci_ids);
183
184static struct platform_driver uhci_platform_driver = {
185	.probe		= uhci_hcd_platform_probe,
186	.remove		= uhci_hcd_platform_remove,
187	.shutdown	= uhci_hcd_platform_shutdown,
188	.driver = {
189		.name = "platform-uhci",
190		.of_match_table = platform_uhci_ids,
191	},
192};
193