Commit | Line | Data |
---|---|---|
da0e8fb0 VB |
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, | |
b18ffd49 | 64 | .endpoint_reset = ehci_endpoint_reset, |
da0e8fb0 VB |
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 | |
a8e51775 | 80 | .relinquish_port = ehci_relinquish_port, |
3a31155c | 81 | .port_handed_over = ehci_port_handed_over, |
914b7012 AS |
82 | |
83 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
da0e8fb0 VB |
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 | |
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 | ||
108 | static int __devinit | |
109 | ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) | |
110 | { | |
111 | struct device_node *dn = op->node; | |
112 | struct usb_hcd *hcd; | |
796bcae7 | 113 | struct ehci_hcd *ehci = NULL; |
da0e8fb0 VB |
114 | struct resource res; |
115 | int irq; | |
116 | int rv; | |
117 | ||
796bcae7 VB |
118 | struct device_node *np; |
119 | ||
da0e8fb0 VB |
120 | 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)) { | |
137 | printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); | |
138 | rv = -EBUSY; | |
139 | goto err_rmr; | |
140 | } | |
141 | ||
142 | irq = irq_of_parse_and_map(dn, 0); | |
143 | if (irq == NO_IRQ) { | |
144 | printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); | |
145 | rv = -EBUSY; | |
146 | goto err_irq; | |
147 | } | |
148 | ||
149 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
150 | if (!hcd->regs) { | |
151 | printk(KERN_ERR __FILE__ ": ioremap failed\n"); | |
152 | rv = -ENOMEM; | |
153 | goto err_ioremap; | |
154 | } | |
155 | ||
156 | ehci = hcd_to_ehci(hcd); | |
796bcae7 VB |
157 | 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 | |
164 | pr_debug(__FILE__ ": no ohci offset in fdt\n"); | |
165 | if (!ehci->ohci_hcctrl_reg) { | |
166 | pr_debug(__FILE__ ": ioremap for ohci hcctrl failed\n"); | |
167 | } else { | |
168 | ehci->has_amcc_usb23 = 1; | |
169 | } | |
170 | } | |
da0e8fb0 VB |
171 | |
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); | |
199 | err_ioremap: | |
200 | irq_dispose_mapping(irq); | |
201 | err_irq: | |
202 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
796bcae7 VB |
203 | |
204 | if (ehci->has_amcc_usb23) | |
205 | iounmap(ehci->ohci_hcctrl_reg); | |
da0e8fb0 VB |
206 | err_rmr: |
207 | usb_put_hcd(hcd); | |
208 | ||
209 | return rv; | |
210 | } | |
211 | ||
212 | ||
213 | static int ehci_hcd_ppc_of_remove(struct of_device *op) | |
214 | { | |
215 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
796bcae7 VB |
216 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
217 | ||
218 | struct device_node *np; | |
219 | struct resource res; | |
220 | ||
da0e8fb0 VB |
221 | 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 | ||
796bcae7 VB |
231 | /* 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 | |
244 | pr_debug(__FILE__ ": no ohci offset in fdt\n"); | |
245 | of_node_put(np); | |
246 | } | |
247 | ||
248 | iounmap(ehci->ohci_hcctrl_reg); | |
249 | } | |
da0e8fb0 VB |
250 | usb_put_hcd(hcd); |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | ||
256 | static 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 | ||
c4386ad0 | 267 | static const struct of_device_id ehci_hcd_ppc_of_match[] = { |
da0e8fb0 VB |
268 | { |
269 | .compatible = "usb-ehci", | |
270 | }, | |
271 | {}, | |
272 | }; | |
273 | MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); | |
274 | ||
275 | ||
276 | static struct of_platform_driver ehci_hcd_ppc_of_driver = { | |
277 | .name = "ppc-of-ehci", | |
278 | .match_table = ehci_hcd_ppc_of_match, | |
279 | .probe = ehci_hcd_ppc_of_probe, | |
280 | .remove = ehci_hcd_ppc_of_remove, | |
281 | .shutdown = ehci_hcd_ppc_of_shutdown, | |
282 | .driver = { | |
283 | .name = "ppc-of-ehci", | |
284 | .owner = THIS_MODULE, | |
285 | }, | |
286 | }; |