xref: /openbmc/linux/drivers/usb/host/ehci-spear.c (revision 2c684d89)
1 /*
2 * Driver for EHCI HCD on SPEAr SOC
3 *
4 * Copyright (C) 2010 ST Micro Electronics,
5 * Deepak Sikri <deepak.sikri@st.com>
6 *
7 * Based on various ehci-*.c drivers
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13 
14 #include <linux/clk.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/io.h>
17 #include <linux/jiffies.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm.h>
23 #include <linux/usb.h>
24 #include <linux/usb/hcd.h>
25 
26 #include "ehci.h"
27 
28 #define DRIVER_DESC "EHCI SPEAr driver"
29 
30 static const char hcd_name[] = "SPEAr-ehci";
31 
32 struct spear_ehci {
33 	struct clk *clk;
34 };
35 
36 #define to_spear_ehci(hcd)	(struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
37 
38 static struct hc_driver __read_mostly ehci_spear_hc_driver;
39 
40 #ifdef CONFIG_PM_SLEEP
41 static int ehci_spear_drv_suspend(struct device *dev)
42 {
43 	struct usb_hcd *hcd = dev_get_drvdata(dev);
44 	bool do_wakeup = device_may_wakeup(dev);
45 
46 	return ehci_suspend(hcd, do_wakeup);
47 }
48 
49 static int ehci_spear_drv_resume(struct device *dev)
50 {
51 	struct usb_hcd *hcd = dev_get_drvdata(dev);
52 
53 	ehci_resume(hcd, false);
54 	return 0;
55 }
56 #endif /* CONFIG_PM_SLEEP */
57 
58 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
59 		ehci_spear_drv_resume);
60 
61 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
62 {
63 	struct usb_hcd *hcd ;
64 	struct spear_ehci *sehci;
65 	struct resource *res;
66 	struct clk *usbh_clk;
67 	const struct hc_driver *driver = &ehci_spear_hc_driver;
68 	int irq, retval;
69 
70 	if (usb_disabled())
71 		return -ENODEV;
72 
73 	irq = platform_get_irq(pdev, 0);
74 	if (irq < 0) {
75 		retval = irq;
76 		goto fail;
77 	}
78 
79 	/*
80 	 * Right now device-tree probed devices don't get dma_mask set.
81 	 * Since shared usb code relies on it, set it here for now.
82 	 * Once we have dma capability bindings this can go away.
83 	 */
84 	retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
85 	if (retval)
86 		goto fail;
87 
88 	usbh_clk = devm_clk_get(&pdev->dev, NULL);
89 	if (IS_ERR(usbh_clk)) {
90 		dev_err(&pdev->dev, "Error getting interface clock\n");
91 		retval = PTR_ERR(usbh_clk);
92 		goto fail;
93 	}
94 
95 	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
96 	if (!hcd) {
97 		retval = -ENOMEM;
98 		goto fail;
99 	}
100 
101 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102 	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
103 	if (IS_ERR(hcd->regs)) {
104 		retval = PTR_ERR(hcd->regs);
105 		goto err_put_hcd;
106 	}
107 	hcd->rsrc_start = res->start;
108 	hcd->rsrc_len = resource_size(res);
109 
110 	sehci = to_spear_ehci(hcd);
111 	sehci->clk = usbh_clk;
112 
113 	/* registers start at offset 0x0 */
114 	hcd_to_ehci(hcd)->caps = hcd->regs;
115 
116 	clk_prepare_enable(sehci->clk);
117 	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
118 	if (retval)
119 		goto err_stop_ehci;
120 
121 	device_wakeup_enable(hcd->self.controller);
122 	return retval;
123 
124 err_stop_ehci:
125 	clk_disable_unprepare(sehci->clk);
126 err_put_hcd:
127 	usb_put_hcd(hcd);
128 fail:
129 	dev_err(&pdev->dev, "init fail, %d\n", retval);
130 
131 	return retval ;
132 }
133 
134 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
135 {
136 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
137 	struct spear_ehci *sehci = to_spear_ehci(hcd);
138 
139 	usb_remove_hcd(hcd);
140 
141 	if (sehci->clk)
142 		clk_disable_unprepare(sehci->clk);
143 	usb_put_hcd(hcd);
144 
145 	return 0;
146 }
147 
148 static const struct of_device_id spear_ehci_id_table[] = {
149 	{ .compatible = "st,spear600-ehci", },
150 	{ },
151 };
152 MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
153 
154 static struct platform_driver spear_ehci_hcd_driver = {
155 	.probe		= spear_ehci_hcd_drv_probe,
156 	.remove		= spear_ehci_hcd_drv_remove,
157 	.shutdown	= usb_hcd_platform_shutdown,
158 	.driver		= {
159 		.name = "spear-ehci",
160 		.bus = &platform_bus_type,
161 		.pm = &ehci_spear_pm_ops,
162 		.of_match_table = spear_ehci_id_table,
163 	}
164 };
165 
166 static const struct ehci_driver_overrides spear_overrides __initdata = {
167 	.extra_priv_size = sizeof(struct spear_ehci),
168 };
169 
170 static int __init ehci_spear_init(void)
171 {
172 	if (usb_disabled())
173 		return -ENODEV;
174 
175 	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
176 
177 	ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
178 	return platform_driver_register(&spear_ehci_hcd_driver);
179 }
180 module_init(ehci_spear_init);
181 
182 static void __exit ehci_spear_cleanup(void)
183 {
184 	platform_driver_unregister(&spear_ehci_hcd_driver);
185 }
186 module_exit(ehci_spear_cleanup);
187 
188 MODULE_DESCRIPTION(DRIVER_DESC);
189 MODULE_ALIAS("platform:spear-ehci");
190 MODULE_AUTHOR("Deepak Sikri");
191 MODULE_LICENSE("GPL");
192