1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3 * OHCI HCD (Host Controller Driver) for USB.
4 *
5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7 * (C) Copyright 2002 Hewlett-Packard Company
8 * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com>
9 *
10 * Bus glue for OHCI HC on the of_platform bus
11 *
12 * Modified for of_platform bus from ohci-sa1111.c
13 *
14 * This file is licenced under the GPL.
15 */
16
17 #include <linux/signal.h>
18 #include <linux/of_address.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_platform.h>
21
22 static int
ohci_ppc_of_start(struct usb_hcd * hcd)23 ohci_ppc_of_start(struct usb_hcd *hcd)
24 {
25 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
26 int ret;
27
28 if ((ret = ohci_init(ohci)) < 0)
29 return ret;
30
31 if ((ret = ohci_run(ohci)) < 0) {
32 dev_err(hcd->self.controller, "can't start %s\n",
33 hcd->self.bus_name);
34 ohci_stop(hcd);
35 return ret;
36 }
37
38 return 0;
39 }
40
41 static const struct hc_driver ohci_ppc_of_hc_driver = {
42 .description = hcd_name,
43 .product_desc = "OF OHCI",
44 .hcd_priv_size = sizeof(struct ohci_hcd),
45
46 /*
47 * generic hardware linkage
48 */
49 .irq = ohci_irq,
50 .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY,
51
52 /*
53 * basic lifecycle operations
54 */
55 .start = ohci_ppc_of_start,
56 .stop = ohci_stop,
57 .shutdown = ohci_shutdown,
58
59 /*
60 * managing i/o requests and associated device resources
61 */
62 .urb_enqueue = ohci_urb_enqueue,
63 .urb_dequeue = ohci_urb_dequeue,
64 .endpoint_disable = ohci_endpoint_disable,
65
66 /*
67 * scheduling support
68 */
69 .get_frame_number = ohci_get_frame,
70
71 /*
72 * root hub support
73 */
74 .hub_status_data = ohci_hub_status_data,
75 .hub_control = ohci_hub_control,
76 #ifdef CONFIG_PM
77 .bus_suspend = ohci_bus_suspend,
78 .bus_resume = ohci_bus_resume,
79 #endif
80 .start_port_reset = ohci_start_port_reset,
81 };
82
83
ohci_hcd_ppc_of_probe(struct platform_device * op)84 static int ohci_hcd_ppc_of_probe(struct platform_device *op)
85 {
86 struct device_node *dn = op->dev.of_node;
87 struct usb_hcd *hcd;
88 struct ohci_hcd *ohci;
89 struct resource res;
90 int irq;
91
92 int rv;
93 int is_bigendian;
94 struct device_node *np;
95
96 if (usb_disabled())
97 return -ENODEV;
98
99 is_bigendian =
100 of_device_is_compatible(dn, "ohci-bigendian") ||
101 of_device_is_compatible(dn, "ohci-be");
102
103 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
104
105 rv = of_address_to_resource(dn, 0, &res);
106 if (rv)
107 return rv;
108
109 hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
110 if (!hcd)
111 return -ENOMEM;
112
113 hcd->rsrc_start = res.start;
114 hcd->rsrc_len = resource_size(&res);
115
116 hcd->regs = devm_ioremap_resource(&op->dev, &res);
117 if (IS_ERR(hcd->regs)) {
118 rv = PTR_ERR(hcd->regs);
119 goto err_rmr;
120 }
121
122 irq = irq_of_parse_and_map(dn, 0);
123 if (irq == NO_IRQ) {
124 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
125 __FILE__);
126 rv = -EBUSY;
127 goto err_rmr;
128 }
129
130 ohci = hcd_to_ohci(hcd);
131 if (is_bigendian) {
132 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
133 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
134 ohci->flags |= OHCI_QUIRK_FRAME_NO;
135 if (of_device_is_compatible(dn, "mpc5200-ohci"))
136 ohci->flags |= OHCI_QUIRK_FRAME_NO;
137 }
138
139 ohci_hcd_init(ohci);
140
141 rv = usb_add_hcd(hcd, irq, 0);
142 if (rv == 0) {
143 device_wakeup_enable(hcd->self.controller);
144 return 0;
145 }
146
147 /* by now, 440epx is known to show usb_23 erratum */
148 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
149
150 /* Work around - At this point ohci_run has executed, the
151 * controller is running, everything, the root ports, etc., is
152 * set up. If the ehci driver is loaded, put the ohci core in
153 * the suspended state. The ehci driver will bring it out of
154 * suspended state when / if a non-high speed USB device is
155 * attached to the USB Host port. If the ehci driver is not
156 * loaded, do nothing. request_mem_region is used to test if
157 * the ehci driver is loaded.
158 */
159 if (np != NULL) {
160 if (!of_address_to_resource(np, 0, &res)) {
161 if (!request_mem_region(res.start, 0x4, hcd_name)) {
162 writel_be((readl_be(&ohci->regs->control) |
163 OHCI_USB_SUSPEND), &ohci->regs->control);
164 (void) readl_be(&ohci->regs->control);
165 } else
166 release_mem_region(res.start, 0x4);
167 } else
168 pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
169 of_node_put(np);
170 }
171
172 irq_dispose_mapping(irq);
173 err_rmr:
174 usb_put_hcd(hcd);
175
176 return rv;
177 }
178
ohci_hcd_ppc_of_remove(struct platform_device * op)179 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
180 {
181 struct usb_hcd *hcd = platform_get_drvdata(op);
182
183 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
184
185 usb_remove_hcd(hcd);
186
187 irq_dispose_mapping(hcd->irq);
188
189 usb_put_hcd(hcd);
190
191 return 0;
192 }
193
194 static const struct of_device_id ohci_hcd_ppc_of_match[] = {
195 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
196 {
197 .name = "usb",
198 .compatible = "ohci-bigendian",
199 },
200 {
201 .name = "usb",
202 .compatible = "ohci-be",
203 },
204 #endif
205 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
206 {
207 .name = "usb",
208 .compatible = "ohci-littledian",
209 },
210 {
211 .name = "usb",
212 .compatible = "ohci-le",
213 },
214 #endif
215 {},
216 };
217 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
218
219 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
220 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
221 #error "No endianness selected for ppc-of-ohci"
222 #endif
223
224
225 static struct platform_driver ohci_hcd_ppc_of_driver = {
226 .probe = ohci_hcd_ppc_of_probe,
227 .remove = ohci_hcd_ppc_of_remove,
228 .shutdown = usb_hcd_platform_shutdown,
229 .driver = {
230 .name = "ppc-of-ohci",
231 .of_match_table = ohci_hcd_ppc_of_match,
232 },
233 };
234
235