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 #include <asm/prom.h>
23
24
25 static int
ohci_ppc_of_start(struct usb_hcd * hcd)26 ohci_ppc_of_start(struct usb_hcd *hcd)
27 {
28 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
29 int ret;
30
31 if ((ret = ohci_init(ohci)) < 0)
32 return ret;
33
34 if ((ret = ohci_run(ohci)) < 0) {
35 dev_err(hcd->self.controller, "can't start %s\n",
36 hcd->self.bus_name);
37 ohci_stop(hcd);
38 return ret;
39 }
40
41 return 0;
42 }
43
44 static const struct hc_driver ohci_ppc_of_hc_driver = {
45 .description = hcd_name,
46 .product_desc = "OF OHCI",
47 .hcd_priv_size = sizeof(struct ohci_hcd),
48
49 /*
50 * generic hardware linkage
51 */
52 .irq = ohci_irq,
53 .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY,
54
55 /*
56 * basic lifecycle operations
57 */
58 .start = ohci_ppc_of_start,
59 .stop = ohci_stop,
60 .shutdown = ohci_shutdown,
61
62 /*
63 * managing i/o requests and associated device resources
64 */
65 .urb_enqueue = ohci_urb_enqueue,
66 .urb_dequeue = ohci_urb_dequeue,
67 .endpoint_disable = ohci_endpoint_disable,
68
69 /*
70 * scheduling support
71 */
72 .get_frame_number = ohci_get_frame,
73
74 /*
75 * root hub support
76 */
77 .hub_status_data = ohci_hub_status_data,
78 .hub_control = ohci_hub_control,
79 #ifdef CONFIG_PM
80 .bus_suspend = ohci_bus_suspend,
81 .bus_resume = ohci_bus_resume,
82 #endif
83 .start_port_reset = ohci_start_port_reset,
84 };
85
86
ohci_hcd_ppc_of_probe(struct platform_device * op)87 static int ohci_hcd_ppc_of_probe(struct platform_device *op)
88 {
89 struct device_node *dn = op->dev.of_node;
90 struct usb_hcd *hcd;
91 struct ohci_hcd *ohci;
92 struct resource res;
93 int irq;
94
95 int rv;
96 int is_bigendian;
97 struct device_node *np;
98
99 if (usb_disabled())
100 return -ENODEV;
101
102 is_bigendian =
103 of_device_is_compatible(dn, "ohci-bigendian") ||
104 of_device_is_compatible(dn, "ohci-be");
105
106 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
107
108 rv = of_address_to_resource(dn, 0, &res);
109 if (rv)
110 return rv;
111
112 hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
113 if (!hcd)
114 return -ENOMEM;
115
116 hcd->rsrc_start = res.start;
117 hcd->rsrc_len = resource_size(&res);
118
119 hcd->regs = devm_ioremap_resource(&op->dev, &res);
120 if (IS_ERR(hcd->regs)) {
121 rv = PTR_ERR(hcd->regs);
122 goto err_rmr;
123 }
124
125 irq = irq_of_parse_and_map(dn, 0);
126 if (irq == NO_IRQ) {
127 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
128 __FILE__);
129 rv = -EBUSY;
130 goto err_rmr;
131 }
132
133 ohci = hcd_to_ohci(hcd);
134 if (is_bigendian) {
135 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
136 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
137 ohci->flags |= OHCI_QUIRK_FRAME_NO;
138 if (of_device_is_compatible(dn, "mpc5200-ohci"))
139 ohci->flags |= OHCI_QUIRK_FRAME_NO;
140 }
141
142 ohci_hcd_init(ohci);
143
144 rv = usb_add_hcd(hcd, irq, 0);
145 if (rv == 0) {
146 device_wakeup_enable(hcd->self.controller);
147 return 0;
148 }
149
150 /* by now, 440epx is known to show usb_23 erratum */
151 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
152
153 /* Work around - At this point ohci_run has executed, the
154 * controller is running, everything, the root ports, etc., is
155 * set up. If the ehci driver is loaded, put the ohci core in
156 * the suspended state. The ehci driver will bring it out of
157 * suspended state when / if a non-high speed USB device is
158 * attached to the USB Host port. If the ehci driver is not
159 * loaded, do nothing. request_mem_region is used to test if
160 * the ehci driver is loaded.
161 */
162 if (np != NULL) {
163 if (!of_address_to_resource(np, 0, &res)) {
164 if (!request_mem_region(res.start, 0x4, hcd_name)) {
165 writel_be((readl_be(&ohci->regs->control) |
166 OHCI_USB_SUSPEND), &ohci->regs->control);
167 (void) readl_be(&ohci->regs->control);
168 } else
169 release_mem_region(res.start, 0x4);
170 } else
171 pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
172 of_node_put(np);
173 }
174
175 irq_dispose_mapping(irq);
176 err_rmr:
177 usb_put_hcd(hcd);
178
179 return rv;
180 }
181
ohci_hcd_ppc_of_remove(struct platform_device * op)182 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
183 {
184 struct usb_hcd *hcd = platform_get_drvdata(op);
185
186 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
187
188 usb_remove_hcd(hcd);
189
190 irq_dispose_mapping(hcd->irq);
191
192 usb_put_hcd(hcd);
193
194 return 0;
195 }
196
197 static const struct of_device_id ohci_hcd_ppc_of_match[] = {
198 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
199 {
200 .name = "usb",
201 .compatible = "ohci-bigendian",
202 },
203 {
204 .name = "usb",
205 .compatible = "ohci-be",
206 },
207 #endif
208 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
209 {
210 .name = "usb",
211 .compatible = "ohci-littledian",
212 },
213 {
214 .name = "usb",
215 .compatible = "ohci-le",
216 },
217 #endif
218 {},
219 };
220 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
221
222 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
223 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
224 #error "No endianness selected for ppc-of-ohci"
225 #endif
226
227
228 static struct platform_driver ohci_hcd_ppc_of_driver = {
229 .probe = ohci_hcd_ppc_of_probe,
230 .remove = ohci_hcd_ppc_of_remove,
231 .shutdown = usb_hcd_platform_shutdown,
232 .driver = {
233 .name = "ppc-of-ohci",
234 .of_match_table = ohci_hcd_ppc_of_match,
235 },
236 };
237
238