Merge git://git.infradead.org/~kmpark/onenand-mtd-2.6
[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 };
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 };