1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 * (C) Copyright 2002 Hewlett-Packard Company
7 * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com>
8 *
9 * Bus glue for OHCI HC on the of_platform bus
10 *
11 * Modified for of_platform bus from ohci-sa1111.c
12 *
13 * This file is licenced under the GPL.
14 */
15
16 #include <linux/signal.h>
17 #include <linux/of_platform.h>
18
19 #include <asm/prom.h>
20
21
22 static int __devinit
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 err("can't start %s", ohci_to_hcd(ohci)->self.bus_name);
33 ohci_stop(hcd);
34 return ret;
35 }
36
37 return 0;
38 }
39
40 static const struct hc_driver ohci_ppc_of_hc_driver = {
41 .description = hcd_name,
42 .product_desc = "OF OHCI",
43 .hcd_priv_size = sizeof(struct ohci_hcd),
44
45 /*
46 * generic hardware linkage
47 */
48 .irq = ohci_irq,
49 .flags = HCD_USB11 | HCD_MEMORY,
50
51 /*
52 * basic lifecycle operations
53 */
54 .start = ohci_ppc_of_start,
55 .stop = ohci_stop,
56 .shutdown = ohci_shutdown,
57
58 /*
59 * managing i/o requests and associated device resources
60 */
61 .urb_enqueue = ohci_urb_enqueue,
62 .urb_dequeue = ohci_urb_dequeue,
63 .endpoint_disable = ohci_endpoint_disable,
64
65 /*
66 * scheduling support
67 */
68 .get_frame_number = ohci_get_frame,
69
70 /*
71 * root hub support
72 */
73 .hub_status_data = ohci_hub_status_data,
74 .hub_control = ohci_hub_control,
75 #ifdef CONFIG_PM
76 .bus_suspend = ohci_bus_suspend,
77 .bus_resume = ohci_bus_resume,
78 #endif
79 .start_port_reset = ohci_start_port_reset,
80 };
81
82
ohci_hcd_ppc_of_probe(struct platform_device * op)83 static int __devinit ohci_hcd_ppc_of_probe(struct platform_device *op)
84 {
85 struct device_node *dn = op->dev.of_node;
86 struct usb_hcd *hcd;
87 struct ohci_hcd *ohci;
88 struct resource res;
89 int irq;
90
91 int rv;
92 int is_bigendian;
93 struct device_node *np;
94
95 if (usb_disabled())
96 return -ENODEV;
97
98 is_bigendian =
99 of_device_is_compatible(dn, "ohci-bigendian") ||
100 of_device_is_compatible(dn, "ohci-be");
101
102 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
103
104 rv = of_address_to_resource(dn, 0, &res);
105 if (rv)
106 return rv;
107
108 hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
109 if (!hcd)
110 return -ENOMEM;
111
112 hcd->rsrc_start = res.start;
113 hcd->rsrc_len = res.end - res.start + 1;
114
115 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
116 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
117 rv = -EBUSY;
118 goto err_rmr;
119 }
120
121 irq = irq_of_parse_and_map(dn, 0);
122 if (irq == NO_IRQ) {
123 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
124 rv = -EBUSY;
125 goto err_irq;
126 }
127
128 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
129 if (!hcd->regs) {
130 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
131 rv = -ENOMEM;
132 goto err_ioremap;
133 }
134
135 ohci = hcd_to_ohci(hcd);
136 if (is_bigendian) {
137 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
138 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
139 ohci->flags |= OHCI_QUIRK_FRAME_NO;
140 if (of_device_is_compatible(dn, "mpc5200-ohci"))
141 ohci->flags |= OHCI_QUIRK_FRAME_NO;
142 }
143
144 ohci_hcd_init(ohci);
145
146 rv = usb_add_hcd(hcd, irq, IRQF_DISABLED);
147 if (rv == 0)
148 return 0;
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 }
173
174 iounmap(hcd->regs);
175 err_ioremap:
176 irq_dispose_mapping(irq);
177 err_irq:
178 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
179 err_rmr:
180 usb_put_hcd(hcd);
181
182 return rv;
183 }
184
ohci_hcd_ppc_of_remove(struct platform_device * op)185 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
186 {
187 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
188 dev_set_drvdata(&op->dev, NULL);
189
190 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
191
192 usb_remove_hcd(hcd);
193
194 iounmap(hcd->regs);
195 irq_dispose_mapping(hcd->irq);
196 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
197
198 usb_put_hcd(hcd);
199
200 return 0;
201 }
202
ohci_hcd_ppc_of_shutdown(struct platform_device * op)203 static void ohci_hcd_ppc_of_shutdown(struct platform_device *op)
204 {
205 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
206
207 if (hcd->driver->shutdown)
208 hcd->driver->shutdown(hcd);
209 }
210
211
212 static const struct of_device_id ohci_hcd_ppc_of_match[] = {
213 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
214 {
215 .name = "usb",
216 .compatible = "ohci-bigendian",
217 },
218 {
219 .name = "usb",
220 .compatible = "ohci-be",
221 },
222 #endif
223 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
224 {
225 .name = "usb",
226 .compatible = "ohci-littledian",
227 },
228 {
229 .name = "usb",
230 .compatible = "ohci-le",
231 },
232 #endif
233 {},
234 };
235 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
236
237 #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
238 !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
239 #error "No endianess selected for ppc-of-ohci"
240 #endif
241
242
243 static struct platform_driver ohci_hcd_ppc_of_driver = {
244 .probe = ohci_hcd_ppc_of_probe,
245 .remove = ohci_hcd_ppc_of_remove,
246 .shutdown = ohci_hcd_ppc_of_shutdown,
247 .driver = {
248 .name = "ppc-of-ohci",
249 .owner = THIS_MODULE,
250 .of_match_table = ohci_hcd_ppc_of_match,
251 },
252 };
253
254