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 */
ehci_ppc_of_setup(struct usb_hcd * hcd)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 .endpoint_reset = ehci_endpoint_reset,
65
66 /*
67 * scheduling support
68 */
69 .get_frame_number = ehci_get_frame,
70
71 /*
72 * root hub support
73 */
74 .hub_status_data = ehci_hub_status_data,
75 .hub_control = ehci_hub_control,
76 #ifdef CONFIG_PM
77 .bus_suspend = ehci_bus_suspend,
78 .bus_resume = ehci_bus_resume,
79 #endif
80 .relinquish_port = ehci_relinquish_port,
81 .port_handed_over = ehci_port_handed_over,
82
83 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
84 };
85
86
87 /*
88 * 440EPx Errata USBH_3
89 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
90 */
91 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0)
92 static int __devinit
ppc44x_enable_bmt(struct device_node * dn)93 ppc44x_enable_bmt(struct device_node *dn)
94 {
95 __iomem u32 *insreg_virt;
96
97 insreg_virt = of_iomap(dn, 1);
98 if (!insreg_virt)
99 return -EINVAL;
100
101 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
102
103 iounmap(insreg_virt);
104 return 0;
105 }
106
107
ehci_hcd_ppc_of_probe(struct platform_device * op)108 static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op)
109 {
110 struct device_node *dn = op->dev.of_node;
111 struct usb_hcd *hcd;
112 struct ehci_hcd *ehci = NULL;
113 struct resource res;
114 int irq;
115 int rv;
116
117 struct device_node *np;
118
119 if (usb_disabled())
120 return -ENODEV;
121
122 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
123
124 rv = of_address_to_resource(dn, 0, &res);
125 if (rv)
126 return rv;
127
128 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
129 if (!hcd)
130 return -ENOMEM;
131
132 hcd->rsrc_start = res.start;
133 hcd->rsrc_len = resource_size(&res);
134
135 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
136 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
137 rv = -EBUSY;
138 goto err_rmr;
139 }
140
141 irq = irq_of_parse_and_map(dn, 0);
142 if (irq == NO_IRQ) {
143 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
144 rv = -EBUSY;
145 goto err_irq;
146 }
147
148 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
149 if (!hcd->regs) {
150 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
151 rv = -ENOMEM;
152 goto err_ioremap;
153 }
154
155 ehci = hcd_to_ehci(hcd);
156 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
157 if (np != NULL) {
158 /* claim we really affected by usb23 erratum */
159 if (!of_address_to_resource(np, 0, &res))
160 ehci->ohci_hcctrl_reg = ioremap(res.start +
161 OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
162 else
163 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
164 if (!ehci->ohci_hcctrl_reg) {
165 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
166 } else {
167 ehci->has_amcc_usb23 = 1;
168 }
169 }
170
171 if (of_get_property(dn, "big-endian", NULL)) {
172 ehci->big_endian_mmio = 1;
173 ehci->big_endian_desc = 1;
174 }
175 if (of_get_property(dn, "big-endian-regs", NULL))
176 ehci->big_endian_mmio = 1;
177 if (of_get_property(dn, "big-endian-desc", NULL))
178 ehci->big_endian_desc = 1;
179
180 ehci->caps = hcd->regs;
181 ehci->regs = hcd->regs +
182 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
183
184 /* cache this readonly data; minimize chip reads */
185 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
186
187 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
188 rv = ppc44x_enable_bmt(dn);
189 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
190 rv ? "NOT ": "");
191 }
192
193 rv = usb_add_hcd(hcd, irq, 0);
194 if (rv)
195 goto err_ehci;
196
197 return 0;
198
199 err_ehci:
200 if (ehci->has_amcc_usb23)
201 iounmap(ehci->ohci_hcctrl_reg);
202 iounmap(hcd->regs);
203 err_ioremap:
204 irq_dispose_mapping(irq);
205 err_irq:
206 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
207 err_rmr:
208 usb_put_hcd(hcd);
209
210 return rv;
211 }
212
213
ehci_hcd_ppc_of_remove(struct platform_device * op)214 static int ehci_hcd_ppc_of_remove(struct platform_device *op)
215 {
216 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
217 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
218
219 struct device_node *np;
220 struct resource res;
221
222 dev_set_drvdata(&op->dev, NULL);
223
224 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
225
226 usb_remove_hcd(hcd);
227
228 iounmap(hcd->regs);
229 irq_dispose_mapping(hcd->irq);
230 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
231
232 /* use request_mem_region to test if the ohci driver is loaded. if so
233 * ensure the ohci core is operational.
234 */
235 if (ehci->has_amcc_usb23) {
236 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
237 if (np != NULL) {
238 if (!of_address_to_resource(np, 0, &res))
239 if (!request_mem_region(res.start,
240 0x4, hcd_name))
241 set_ohci_hcfs(ehci, 1);
242 else
243 release_mem_region(res.start, 0x4);
244 else
245 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
246 of_node_put(np);
247 }
248
249 iounmap(ehci->ohci_hcctrl_reg);
250 }
251 usb_put_hcd(hcd);
252
253 return 0;
254 }
255
256
ehci_hcd_ppc_of_shutdown(struct platform_device * op)257 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op)
258 {
259 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
260
261 if (hcd->driver->shutdown)
262 hcd->driver->shutdown(hcd);
263 }
264
265
266 static const struct of_device_id ehci_hcd_ppc_of_match[] = {
267 {
268 .compatible = "usb-ehci",
269 },
270 {},
271 };
272 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
273
274
275 static struct platform_driver ehci_hcd_ppc_of_driver = {
276 .probe = ehci_hcd_ppc_of_probe,
277 .remove = ehci_hcd_ppc_of_remove,
278 .shutdown = ehci_hcd_ppc_of_shutdown,
279 .driver = {
280 .name = "ppc-of-ehci",
281 .owner = THIS_MODULE,
282 .of_match_table = ehci_hcd_ppc_of_match,
283 },
284 };
285