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Valentine Barshakda0e8fb2007-12-30 15:28:50 -08001/*
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 */
21static 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
39static 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,
Alan Sternb18ffd42009-05-27 18:21:56 -040064 .endpoint_reset = ehci_endpoint_reset,
Valentine Barshakda0e8fb2007-12-30 15:28:50 -080065
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
Alan Sterna8e51772008-05-20 16:58:11 -040080 .relinquish_port = ehci_relinquish_port,
Alan Stern3a311552008-05-20 16:58:29 -040081 .port_handed_over = ehci_port_handed_over,
Alan Stern914b7012009-06-29 10:47:30 -040082
83 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
Valentine Barshakda0e8fb2007-12-30 15:28:50 -080084};
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)
92static int __devinit
93ppc44x_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
108static int __devinit
109ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
110{
Grant Likely61c7a082010-04-13 16:12:29 -0700111 struct device_node *dn = op->dev.of_node;
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800112 struct usb_hcd *hcd;
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100113 struct ehci_hcd *ehci = NULL;
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800114 struct resource res;
115 int irq;
116 int rv;
117
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100118 struct device_node *np;
119
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800120 if (usb_disabled())
121 return -ENODEV;
122
123 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
124
125 rv = of_address_to_resource(dn, 0, &res);
126 if (rv)
127 return rv;
128
129 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
130 if (!hcd)
131 return -ENOMEM;
132
133 hcd->rsrc_start = res.start;
134 hcd->rsrc_len = res.end - res.start + 1;
135
136 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
Joe Perchesf45ba772010-02-05 17:51:13 -0800137 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800138 rv = -EBUSY;
139 goto err_rmr;
140 }
141
142 irq = irq_of_parse_and_map(dn, 0);
143 if (irq == NO_IRQ) {
Joe Perchesf45ba772010-02-05 17:51:13 -0800144 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800145 rv = -EBUSY;
146 goto err_irq;
147 }
148
149 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
150 if (!hcd->regs) {
Joe Perchesf45ba772010-02-05 17:51:13 -0800151 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800152 rv = -ENOMEM;
153 goto err_ioremap;
154 }
155
156 ehci = hcd_to_ehci(hcd);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100157 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
158 if (np != NULL) {
159 /* claim we really affected by usb23 erratum */
160 if (!of_address_to_resource(np, 0, &res))
161 ehci->ohci_hcctrl_reg = ioremap(res.start +
162 OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
163 else
Joe Perchesf45ba772010-02-05 17:51:13 -0800164 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100165 if (!ehci->ohci_hcctrl_reg) {
Joe Perchesf45ba772010-02-05 17:51:13 -0800166 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100167 } else {
168 ehci->has_amcc_usb23 = 1;
169 }
170 }
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800171
172 if (of_get_property(dn, "big-endian", NULL)) {
173 ehci->big_endian_mmio = 1;
174 ehci->big_endian_desc = 1;
175 }
176 if (of_get_property(dn, "big-endian-regs", NULL))
177 ehci->big_endian_mmio = 1;
178 if (of_get_property(dn, "big-endian-desc", NULL))
179 ehci->big_endian_desc = 1;
180
181 ehci->caps = hcd->regs;
182 ehci->regs = hcd->regs +
183 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
184
185 /* cache this readonly data; minimize chip reads */
186 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
187
188 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
189 rv = ppc44x_enable_bmt(dn);
190 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
191 rv ? "NOT ": "");
192 }
193
194 rv = usb_add_hcd(hcd, irq, 0);
195 if (rv == 0)
196 return 0;
197
198 iounmap(hcd->regs);
199err_ioremap:
200 irq_dispose_mapping(irq);
201err_irq:
202 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100203
204 if (ehci->has_amcc_usb23)
205 iounmap(ehci->ohci_hcctrl_reg);
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800206err_rmr:
207 usb_put_hcd(hcd);
208
209 return rv;
210}
211
212
213static int ehci_hcd_ppc_of_remove(struct of_device *op)
214{
215 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100216 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
217
218 struct device_node *np;
219 struct resource res;
220
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800221 dev_set_drvdata(&op->dev, NULL);
222
223 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
224
225 usb_remove_hcd(hcd);
226
227 iounmap(hcd->regs);
228 irq_dispose_mapping(hcd->irq);
229 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
230
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100231 /* use request_mem_region to test if the ohci driver is loaded. if so
232 * ensure the ohci core is operational.
233 */
234 if (ehci->has_amcc_usb23) {
235 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
236 if (np != NULL) {
237 if (!of_address_to_resource(np, 0, &res))
238 if (!request_mem_region(res.start,
239 0x4, hcd_name))
240 set_ohci_hcfs(ehci, 1);
241 else
242 release_mem_region(res.start, 0x4);
243 else
Joe Perchesf45ba772010-02-05 17:51:13 -0800244 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
Vitaly Bordug796bcae2008-11-09 19:43:30 +0100245 of_node_put(np);
246 }
247
248 iounmap(ehci->ohci_hcctrl_reg);
249 }
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800250 usb_put_hcd(hcd);
251
252 return 0;
253}
254
255
256static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
257{
258 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
259
260 if (hcd->driver->shutdown)
261 hcd->driver->shutdown(hcd);
262
263 return 0;
264}
265
266
Németh Mártonc4386ad2010-01-10 15:35:03 +0100267static const struct of_device_id ehci_hcd_ppc_of_match[] = {
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800268 {
269 .compatible = "usb-ehci",
270 },
271 {},
272};
273MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
274
275
276static struct of_platform_driver ehci_hcd_ppc_of_driver = {
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800277 .probe = ehci_hcd_ppc_of_probe,
278 .remove = ehci_hcd_ppc_of_remove,
279 .shutdown = ehci_hcd_ppc_of_shutdown,
Grant Likely40182942010-04-13 16:13:02 -0700280 .driver = {
281 .name = "ppc-of-ehci",
282 .owner = THIS_MODULE,
283 .of_match_table = ehci_hcd_ppc_of_match,
Valentine Barshakda0e8fb2007-12-30 15:28:50 -0800284 },
285};