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