1 /*
2 * EHCI HCD (Host Controller Driver) for USB.
3 *
4 * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus
5 * Tested on AMCC PPC 440EPx
6 *
7 * Valentine Barshak <vbarshak@ru.mvista.com>
8 *
9 * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
10 * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
11 *
12 * This file is licenced under the GPL.
13 */
14
15 #include <linux/signal.h>
16
17 #include <linux/of.h>
18 #include <linux/of_platform.h>
19
20 /* called during probe() after chip reset completes */
21 static int ehci_ppc_of_setup(struct usb_hcd *hcd)
22 {
23 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
24 int retval;
25
26 retval = ehci_halt(ehci);
27 if (retval)
28 return retval;
29
30 retval = ehci_init(hcd);
31 if (retval)
32 return retval;
33
34 ehci->sbrn = 0x20;
35 return ehci_reset(ehci);
36 }
37
38
39 static const struct hc_driver ehci_ppc_of_hc_driver = {
40 .description = hcd_name,
41 .product_desc = "OF EHCI",
42 .hcd_priv_size = sizeof(struct ehci_hcd),
43
44 /*
45 * generic hardware linkage
46 */
47 .irq = ehci_irq,
48 .flags = HCD_MEMORY | HCD_USB2,
49
50 /*
51 * basic lifecycle operations
52 */
53 .reset = ehci_ppc_of_setup,
54 .start = ehci_run,
55 .stop = ehci_stop,
56 .shutdown = ehci_shutdown,
57
58 /*
59 * managing i/o requests and associated device resources
60 */
61 .urb_enqueue = ehci_urb_enqueue,
62 .urb_dequeue = ehci_urb_dequeue,
63 .endpoint_disable = ehci_endpoint_disable,
64
65 /*
66 * scheduling support
67 */
68 .get_frame_number = ehci_get_frame,
69
70 /*
71 * root hub support
72 */
73 .hub_status_data = ehci_hub_status_data,
74 .hub_control = ehci_hub_control,
75 #ifdef CONFIG_PM
76 .bus_suspend = ehci_bus_suspend,
77 .bus_resume = ehci_bus_resume,
78 #endif
79 };
80
81
82 /*
83 * 440EPx Errata USBH_3
84 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
85 */
86 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0)
87 static int __devinit
88 ppc44x_enable_bmt(struct device_node *dn)
89 {
90 __iomem u32 *insreg_virt;
91
92 insreg_virt = of_iomap(dn, 1);
93 if (!insreg_virt)
94 return -EINVAL;
95
96 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
97
98 iounmap(insreg_virt);
99 return 0;
100 }
101
102
103 static int __devinit
104 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
105 {
106 struct device_node *dn = op->node;
107 struct usb_hcd *hcd;
108 struct ehci_hcd *ehci;
109 struct resource res;
110 int irq;
111 int rv;
112
113 if (usb_disabled())
114 return -ENODEV;
115
116 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
117
118 rv = of_address_to_resource(dn, 0, &res);
119 if (rv)
120 return rv;
121
122 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
123 if (!hcd)
124 return -ENOMEM;
125
126 hcd->rsrc_start = res.start;
127 hcd->rsrc_len = res.end - res.start + 1;
128
129 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
130 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
131 rv = -EBUSY;
132 goto err_rmr;
133 }
134
135 irq = irq_of_parse_and_map(dn, 0);
136 if (irq == NO_IRQ) {
137 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
138 rv = -EBUSY;
139 goto err_irq;
140 }
141
142 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
143 if (!hcd->regs) {
144 printk(KERN_ERR __FILE__ ": ioremap failed\n");
145 rv = -ENOMEM;
146 goto err_ioremap;
147 }
148
149 ehci = hcd_to_ehci(hcd);
150
151 if (of_get_property(dn, "big-endian", NULL)) {
152 ehci->big_endian_mmio = 1;
153 ehci->big_endian_desc = 1;
154 }
155 if (of_get_property(dn, "big-endian-regs", NULL))
156 ehci->big_endian_mmio = 1;
157 if (of_get_property(dn, "big-endian-desc", NULL))
158 ehci->big_endian_desc = 1;
159
160 ehci->caps = hcd->regs;
161 ehci->regs = hcd->regs +
162 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
163
164 /* cache this readonly data; minimize chip reads */
165 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
166
167 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
168 rv = ppc44x_enable_bmt(dn);
169 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
170 rv ? "NOT ": "");
171 }
172
173 rv = usb_add_hcd(hcd, irq, 0);
174 if (rv == 0)
175 return 0;
176
177 iounmap(hcd->regs);
178 err_ioremap:
179 irq_dispose_mapping(irq);
180 err_irq:
181 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
182 err_rmr:
183 usb_put_hcd(hcd);
184
185 return rv;
186 }
187
188
189 static int ehci_hcd_ppc_of_remove(struct of_device *op)
190 {
191 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
192 dev_set_drvdata(&op->dev, NULL);
193
194 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
195
196 usb_remove_hcd(hcd);
197
198 iounmap(hcd->regs);
199 irq_dispose_mapping(hcd->irq);
200 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
201
202 usb_put_hcd(hcd);
203
204 return 0;
205 }
206
207
208 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
209 {
210 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
211
212 if (hcd->driver->shutdown)
213 hcd->driver->shutdown(hcd);
214
215 return 0;
216 }
217
218
219 static struct of_device_id ehci_hcd_ppc_of_match[] = {
220 {
221 .compatible = "usb-ehci",
222 },
223 {},
224 };
225 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
226
227
228 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
229 .name = "ppc-of-ehci",
230 .match_table = ehci_hcd_ppc_of_match,
231 .probe = ehci_hcd_ppc_of_probe,
232 .remove = ehci_hcd_ppc_of_remove,
233 .shutdown = ehci_hcd_ppc_of_shutdown,
234 .driver = {
235 .name = "ppc-of-ehci",
236 .owner = THIS_MODULE,
237 },
238 };
239
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