Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight
[linux-2.6] / drivers / usb / host / ehci-ppc-of.c
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         .relinquish_port        = ehci_relinquish_port,
80         .port_handed_over       = ehci_port_handed_over,
81 };
82
83
84 /*
85  * 440EPx Errata USBH_3
86  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
87  */
88 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
89 static int __devinit
90 ppc44x_enable_bmt(struct device_node *dn)
91 {
92         __iomem u32 *insreg_virt;
93
94         insreg_virt = of_iomap(dn, 1);
95         if (!insreg_virt)
96                 return  -EINVAL;
97
98         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
99
100         iounmap(insreg_virt);
101         return 0;
102 }
103
104
105 static int __devinit
106 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
107 {
108         struct device_node *dn = op->node;
109         struct usb_hcd *hcd;
110         struct ehci_hcd *ehci;
111         struct resource res;
112         int irq;
113         int rv;
114
115         if (usb_disabled())
116                 return -ENODEV;
117
118         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
119
120         rv = of_address_to_resource(dn, 0, &res);
121         if (rv)
122                 return rv;
123
124         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
125         if (!hcd)
126                 return -ENOMEM;
127
128         hcd->rsrc_start = res.start;
129         hcd->rsrc_len = res.end - res.start + 1;
130
131         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
132                 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
133                 rv = -EBUSY;
134                 goto err_rmr;
135         }
136
137         irq = irq_of_parse_and_map(dn, 0);
138         if (irq == NO_IRQ) {
139                 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
140                 rv = -EBUSY;
141                 goto err_irq;
142         }
143
144         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
145         if (!hcd->regs) {
146                 printk(KERN_ERR __FILE__ ": ioremap failed\n");
147                 rv = -ENOMEM;
148                 goto err_ioremap;
149         }
150
151         ehci = hcd_to_ehci(hcd);
152
153         if (of_get_property(dn, "big-endian", NULL)) {
154                 ehci->big_endian_mmio = 1;
155                 ehci->big_endian_desc = 1;
156         }
157         if (of_get_property(dn, "big-endian-regs", NULL))
158                 ehci->big_endian_mmio = 1;
159         if (of_get_property(dn, "big-endian-desc", NULL))
160                 ehci->big_endian_desc = 1;
161
162         ehci->caps = hcd->regs;
163         ehci->regs = hcd->regs +
164                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
165
166         /* cache this readonly data; minimize chip reads */
167         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
168
169         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
170                 rv = ppc44x_enable_bmt(dn);
171                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
172                                 rv ? "NOT ": "");
173         }
174
175         rv = usb_add_hcd(hcd, irq, 0);
176         if (rv == 0)
177                 return 0;
178
179         iounmap(hcd->regs);
180 err_ioremap:
181         irq_dispose_mapping(irq);
182 err_irq:
183         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
184 err_rmr:
185         usb_put_hcd(hcd);
186
187         return rv;
188 }
189
190
191 static int ehci_hcd_ppc_of_remove(struct of_device *op)
192 {
193         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
194         dev_set_drvdata(&op->dev, NULL);
195
196         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
197
198         usb_remove_hcd(hcd);
199
200         iounmap(hcd->regs);
201         irq_dispose_mapping(hcd->irq);
202         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
203
204         usb_put_hcd(hcd);
205
206         return 0;
207 }
208
209
210 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
211 {
212         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
213
214         if (hcd->driver->shutdown)
215                 hcd->driver->shutdown(hcd);
216
217         return 0;
218 }
219
220
221 static struct of_device_id ehci_hcd_ppc_of_match[] = {
222         {
223                 .compatible = "usb-ehci",
224         },
225         {},
226 };
227 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
228
229
230 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
231         .name           = "ppc-of-ehci",
232         .match_table    = ehci_hcd_ppc_of_match,
233         .probe          = ehci_hcd_ppc_of_probe,
234         .remove         = ehci_hcd_ppc_of_remove,
235         .shutdown       = ehci_hcd_ppc_of_shutdown,
236         .driver         = {
237                 .name   = "ppc-of-ehci",
238                 .owner  = THIS_MODULE,
239         },
240 };