1 | // SPDX-License-Identifier: GPL-1.0+ |
2 | /* |
3 | * OHCI HCD (Host Controller Driver) for USB. |
4 | * |
5 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
6 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> |
7 | * (C) Copyright 2002 Hewlett-Packard Company |
8 | * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com> |
9 | * |
10 | * Bus glue for OHCI HC on the of_platform bus |
11 | * |
12 | * Modified for of_platform bus from ohci-sa1111.c |
13 | * |
14 | * This file is licenced under the GPL. |
15 | */ |
16 | |
17 | #include <linux/signal.h> |
18 | #include <linux/of.h> |
19 | #include <linux/of_address.h> |
20 | #include <linux/of_irq.h> |
21 | #include <linux/platform_device.h> |
22 | |
23 | static int |
24 | ohci_ppc_of_start(struct usb_hcd *hcd) |
25 | { |
26 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
27 | int ret; |
28 | |
29 | if ((ret = ohci_init(ohci)) < 0) |
30 | return ret; |
31 | |
32 | if ((ret = ohci_run(ohci)) < 0) { |
33 | dev_err(hcd->self.controller, "can't start %s\n" , |
34 | hcd->self.bus_name); |
35 | ohci_stop(hcd); |
36 | return ret; |
37 | } |
38 | |
39 | return 0; |
40 | } |
41 | |
42 | static const struct hc_driver ohci_ppc_of_hc_driver = { |
43 | .description = hcd_name, |
44 | .product_desc = "OF OHCI" , |
45 | .hcd_priv_size = sizeof(struct ohci_hcd), |
46 | |
47 | /* |
48 | * generic hardware linkage |
49 | */ |
50 | .irq = ohci_irq, |
51 | .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY, |
52 | |
53 | /* |
54 | * basic lifecycle operations |
55 | */ |
56 | .start = ohci_ppc_of_start, |
57 | .stop = ohci_stop, |
58 | .shutdown = ohci_shutdown, |
59 | |
60 | /* |
61 | * managing i/o requests and associated device resources |
62 | */ |
63 | .urb_enqueue = ohci_urb_enqueue, |
64 | .urb_dequeue = ohci_urb_dequeue, |
65 | .endpoint_disable = ohci_endpoint_disable, |
66 | |
67 | /* |
68 | * scheduling support |
69 | */ |
70 | .get_frame_number = ohci_get_frame, |
71 | |
72 | /* |
73 | * root hub support |
74 | */ |
75 | .hub_status_data = ohci_hub_status_data, |
76 | .hub_control = ohci_hub_control, |
77 | #ifdef CONFIG_PM |
78 | .bus_suspend = ohci_bus_suspend, |
79 | .bus_resume = ohci_bus_resume, |
80 | #endif |
81 | .start_port_reset = ohci_start_port_reset, |
82 | }; |
83 | |
84 | |
85 | static int ohci_hcd_ppc_of_probe(struct platform_device *op) |
86 | { |
87 | struct device_node *dn = op->dev.of_node; |
88 | struct usb_hcd *hcd; |
89 | struct ohci_hcd *ohci; |
90 | struct resource res; |
91 | int irq; |
92 | |
93 | int rv; |
94 | int is_bigendian; |
95 | struct device_node *np; |
96 | |
97 | if (usb_disabled()) |
98 | return -ENODEV; |
99 | |
100 | is_bigendian = |
101 | of_device_is_compatible(device: dn, "ohci-bigendian" ) || |
102 | of_device_is_compatible(device: dn, "ohci-be" ); |
103 | |
104 | dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n" ); |
105 | |
106 | rv = of_address_to_resource(dev: dn, index: 0, r: &res); |
107 | if (rv) |
108 | return rv; |
109 | |
110 | hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB" ); |
111 | if (!hcd) |
112 | return -ENOMEM; |
113 | |
114 | hcd->rsrc_start = res.start; |
115 | hcd->rsrc_len = resource_size(res: &res); |
116 | |
117 | hcd->regs = devm_ioremap_resource(dev: &op->dev, res: &res); |
118 | if (IS_ERR(ptr: hcd->regs)) { |
119 | rv = PTR_ERR(ptr: hcd->regs); |
120 | goto err_rmr; |
121 | } |
122 | |
123 | irq = irq_of_parse_and_map(node: dn, index: 0); |
124 | if (!irq) { |
125 | dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n" , |
126 | __FILE__); |
127 | rv = -EBUSY; |
128 | goto err_rmr; |
129 | } |
130 | |
131 | ohci = hcd_to_ohci(hcd); |
132 | if (is_bigendian) { |
133 | ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC; |
134 | if (of_device_is_compatible(device: dn, "fsl,mpc5200-ohci" )) |
135 | ohci->flags |= OHCI_QUIRK_FRAME_NO; |
136 | if (of_device_is_compatible(device: dn, "mpc5200-ohci" )) |
137 | ohci->flags |= OHCI_QUIRK_FRAME_NO; |
138 | } |
139 | |
140 | ohci_hcd_init(ohci); |
141 | |
142 | rv = usb_add_hcd(hcd, irq, 0); |
143 | if (rv == 0) { |
144 | device_wakeup_enable(dev: hcd->self.controller); |
145 | return 0; |
146 | } |
147 | |
148 | /* by now, 440epx is known to show usb_23 erratum */ |
149 | np = of_find_compatible_node(NULL, NULL, compat: "ibm,usb-ehci-440epx" ); |
150 | |
151 | /* Work around - At this point ohci_run has executed, the |
152 | * controller is running, everything, the root ports, etc., is |
153 | * set up. If the ehci driver is loaded, put the ohci core in |
154 | * the suspended state. The ehci driver will bring it out of |
155 | * suspended state when / if a non-high speed USB device is |
156 | * attached to the USB Host port. If the ehci driver is not |
157 | * loaded, do nothing. request_mem_region is used to test if |
158 | * the ehci driver is loaded. |
159 | */ |
160 | if (np != NULL) { |
161 | if (!of_address_to_resource(dev: np, index: 0, r: &res)) { |
162 | if (!request_mem_region(res.start, 0x4, hcd_name)) { |
163 | writel_be((readl_be(&ohci->regs->control) | |
164 | OHCI_USB_SUSPEND), &ohci->regs->control); |
165 | (void) readl_be(&ohci->regs->control); |
166 | } else |
167 | release_mem_region(res.start, 0x4); |
168 | } else |
169 | pr_debug("%s: cannot get ehci offset from fdt\n" , __FILE__); |
170 | of_node_put(node: np); |
171 | } |
172 | |
173 | irq_dispose_mapping(virq: irq); |
174 | err_rmr: |
175 | usb_put_hcd(hcd); |
176 | |
177 | return rv; |
178 | } |
179 | |
180 | static void ohci_hcd_ppc_of_remove(struct platform_device *op) |
181 | { |
182 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
183 | |
184 | dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n" ); |
185 | |
186 | usb_remove_hcd(hcd); |
187 | |
188 | irq_dispose_mapping(virq: hcd->irq); |
189 | |
190 | usb_put_hcd(hcd); |
191 | } |
192 | |
193 | static const struct of_device_id ohci_hcd_ppc_of_match[] = { |
194 | #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE |
195 | { |
196 | .name = "usb" , |
197 | .compatible = "ohci-bigendian" , |
198 | }, |
199 | { |
200 | .name = "usb" , |
201 | .compatible = "ohci-be" , |
202 | }, |
203 | #endif |
204 | #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE |
205 | { |
206 | .name = "usb" , |
207 | .compatible = "ohci-littledian" , |
208 | }, |
209 | { |
210 | .name = "usb" , |
211 | .compatible = "ohci-le" , |
212 | }, |
213 | #endif |
214 | {}, |
215 | }; |
216 | MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match); |
217 | |
218 | #if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \ |
219 | !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE) |
220 | #error "No endianness selected for ppc-of-ohci" |
221 | #endif |
222 | |
223 | |
224 | static struct platform_driver ohci_hcd_ppc_of_driver = { |
225 | .probe = ohci_hcd_ppc_of_probe, |
226 | .remove_new = ohci_hcd_ppc_of_remove, |
227 | .shutdown = usb_hcd_platform_shutdown, |
228 | .driver = { |
229 | .name = "ppc-of-ohci" , |
230 | .of_match_table = ohci_hcd_ppc_of_match, |
231 | }, |
232 | }; |
233 | |
234 | |