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08d3c18e JZ |
1 | /* |
2 | * EHCI HCD (Host Controller Driver) for USB. | |
3 | * | |
4 | * Bus Glue for Xilinx EHCI core on the of_platform bus | |
5 | * | |
6 | * Copyright (c) 2009 Xilinx, Inc. | |
7 | * | |
8 | * Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com> | |
9 | * and "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 program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
19 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software Foundation, | |
24 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/signal.h> | |
29 | ||
30 | #include <linux/of.h> | |
31 | #include <linux/of_platform.h> | |
337fc720 | 32 | #include <linux/of_address.h> |
08d3c18e | 33 | |
08d3c18e JZ |
34 | /** |
35 | * ehci_xilinx_port_handed_over - hand the port out if failed to enable it | |
36 | * @hcd: Pointer to the usb_hcd device to which the host controller bound | |
37 | * @portnum:Port number to which the device is attached. | |
38 | * | |
39 | * This function is used as a place to tell the user that the Xilinx USB host | |
40 | * controller does support LS devices. And in an HS only configuration, it | |
41 | * does not support FS devices either. It is hoped that this can help a | |
42 | * confused user. | |
43 | * | |
44 | * There are cases when the host controller fails to enable the port due to, | |
45 | * for example, insufficient power that can be supplied to the device from | |
46 | * the USB bus. In those cases, the messages printed here are not helpful. | |
47 | */ | |
48 | static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum) | |
49 | { | |
50 | dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum); | |
51 | if (hcd->has_tt) { | |
52 | dev_warn(hcd->self.controller, | |
53 | "Maybe you have connected a low speed device?\n"); | |
54 | ||
55 | dev_warn(hcd->self.controller, | |
56 | "We do not support low speed devices\n"); | |
57 | } else { | |
58 | dev_warn(hcd->self.controller, | |
59 | "Maybe your device is not a high speed device?\n"); | |
60 | dev_warn(hcd->self.controller, | |
61 | "The USB host controller does not support full speed " | |
62 | "nor low speed devices\n"); | |
63 | dev_warn(hcd->self.controller, | |
64 | "You can reconfigure the host controller to have " | |
65 | "full speed support\n"); | |
66 | } | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | ||
72 | static const struct hc_driver ehci_xilinx_of_hc_driver = { | |
73 | .description = hcd_name, | |
74 | .product_desc = "OF EHCI", | |
75 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
76 | ||
77 | /* | |
78 | * generic hardware linkage | |
79 | */ | |
80 | .irq = ehci_irq, | |
81 | .flags = HCD_MEMORY | HCD_USB2, | |
82 | ||
83 | /* | |
84 | * basic lifecycle operations | |
85 | */ | |
1a49e2ac | 86 | .reset = ehci_setup, |
08d3c18e JZ |
87 | .start = ehci_run, |
88 | .stop = ehci_stop, | |
89 | .shutdown = ehci_shutdown, | |
90 | ||
91 | /* | |
92 | * managing i/o requests and associated device resources | |
93 | */ | |
94 | .urb_enqueue = ehci_urb_enqueue, | |
95 | .urb_dequeue = ehci_urb_dequeue, | |
96 | .endpoint_disable = ehci_endpoint_disable, | |
b48d7f50 | 97 | .endpoint_reset = ehci_endpoint_reset, |
08d3c18e JZ |
98 | |
99 | /* | |
100 | * scheduling support | |
101 | */ | |
102 | .get_frame_number = ehci_get_frame, | |
103 | ||
104 | /* | |
105 | * root hub support | |
106 | */ | |
107 | .hub_status_data = ehci_hub_status_data, | |
108 | .hub_control = ehci_hub_control, | |
109 | #ifdef CONFIG_PM | |
110 | .bus_suspend = ehci_bus_suspend, | |
111 | .bus_resume = ehci_bus_resume, | |
112 | #endif | |
113 | .relinquish_port = NULL, | |
114 | .port_handed_over = ehci_xilinx_port_handed_over, | |
115 | ||
116 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
117 | }; | |
118 | ||
119 | /** | |
120 | * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller | |
2dc11581 | 121 | * @op: pointer to the platform_device bound to the host controller |
08d3c18e JZ |
122 | * |
123 | * This function requests resources and sets up appropriate properties for the | |
124 | * host controller. Because the Xilinx USB host controller can be configured | |
125 | * as HS only or HS/FS only, it checks the configuration in the device tree | |
126 | * entry, and sets an appropriate value for hcd->has_tt. | |
127 | */ | |
41ac7b3a | 128 | static int ehci_hcd_xilinx_of_probe(struct platform_device *op) |
08d3c18e | 129 | { |
ffabc9a6 | 130 | struct device_node *dn = op->dev.of_node; |
08d3c18e JZ |
131 | struct usb_hcd *hcd; |
132 | struct ehci_hcd *ehci; | |
133 | struct resource res; | |
134 | int irq; | |
135 | int rv; | |
136 | int *value; | |
137 | ||
138 | if (usb_disabled()) | |
139 | return -ENODEV; | |
140 | ||
141 | dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n"); | |
142 | ||
143 | rv = of_address_to_resource(dn, 0, &res); | |
144 | if (rv) | |
145 | return rv; | |
146 | ||
147 | hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev, | |
148 | "XILINX-OF USB"); | |
149 | if (!hcd) | |
150 | return -ENOMEM; | |
151 | ||
152 | hcd->rsrc_start = res.start; | |
28f65c11 | 153 | hcd->rsrc_len = resource_size(&res); |
08d3c18e | 154 | |
08d3c18e | 155 | irq = irq_of_parse_and_map(dn, 0); |
7f788ec0 | 156 | if (!irq) { |
f45ba776 | 157 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); |
08d3c18e JZ |
158 | rv = -EBUSY; |
159 | goto err_irq; | |
160 | } | |
161 | ||
6df471ea | 162 | hcd->regs = devm_request_and_ioremap(&op->dev, &res); |
08d3c18e | 163 | if (!hcd->regs) { |
6df471ea | 164 | pr_err("%s: devm_request_and_ioremap failed\n", __FILE__); |
08d3c18e | 165 | rv = -ENOMEM; |
6df471ea | 166 | goto err_irq; |
08d3c18e JZ |
167 | } |
168 | ||
169 | ehci = hcd_to_ehci(hcd); | |
170 | ||
171 | /* This core always has big-endian register interface and uses | |
172 | * big-endian memory descriptors. | |
173 | */ | |
174 | ehci->big_endian_mmio = 1; | |
175 | ehci->big_endian_desc = 1; | |
176 | ||
177 | /* Check whether the FS support option is selected in the hardware. | |
178 | */ | |
179 | value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL); | |
180 | if (value && (*value == 1)) { | |
181 | ehci_dbg(ehci, "USB host controller supports FS devices\n"); | |
182 | hcd->has_tt = 1; | |
183 | } else { | |
184 | ehci_dbg(ehci, | |
185 | "USB host controller is HS only\n"); | |
186 | hcd->has_tt = 0; | |
187 | } | |
188 | ||
189 | /* Debug registers are at the first 0x100 region | |
190 | */ | |
191 | ehci->caps = hcd->regs + 0x100; | |
08d3c18e JZ |
192 | |
193 | rv = usb_add_hcd(hcd, irq, 0); | |
194 | if (rv == 0) | |
195 | return 0; | |
196 | ||
08d3c18e | 197 | err_irq: |
08d3c18e JZ |
198 | usb_put_hcd(hcd); |
199 | ||
200 | return rv; | |
201 | } | |
202 | ||
203 | /** | |
204 | * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources | |
2dc11581 | 205 | * @op: pointer to platform_device structure that is to be removed |
08d3c18e JZ |
206 | * |
207 | * Remove the hcd structure, and release resources that has been requested | |
208 | * during probe. | |
209 | */ | |
2dc11581 | 210 | static int ehci_hcd_xilinx_of_remove(struct platform_device *op) |
08d3c18e JZ |
211 | { |
212 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
213 | dev_set_drvdata(&op->dev, NULL); | |
214 | ||
215 | dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n"); | |
216 | ||
217 | usb_remove_hcd(hcd); | |
218 | ||
08d3c18e JZ |
219 | usb_put_hcd(hcd); |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | /** | |
225 | * ehci_hcd_xilinx_of_shutdown - shutdown the hcd | |
2dc11581 | 226 | * @op: pointer to platform_device structure that is to be removed |
08d3c18e JZ |
227 | * |
228 | * Properly shutdown the hcd, call driver's shutdown routine. | |
229 | */ | |
07828b10 | 230 | static void ehci_hcd_xilinx_of_shutdown(struct platform_device *op) |
08d3c18e JZ |
231 | { |
232 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
233 | ||
234 | if (hcd->driver->shutdown) | |
235 | hcd->driver->shutdown(hcd); | |
08d3c18e JZ |
236 | } |
237 | ||
238 | ||
c4386ad0 | 239 | static const struct of_device_id ehci_hcd_xilinx_of_match[] = { |
08d3c18e JZ |
240 | {.compatible = "xlnx,xps-usb-host-1.00.a",}, |
241 | {}, | |
242 | }; | |
243 | MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match); | |
244 | ||
d35fb641 | 245 | static struct platform_driver ehci_hcd_xilinx_of_driver = { |
08d3c18e JZ |
246 | .probe = ehci_hcd_xilinx_of_probe, |
247 | .remove = ehci_hcd_xilinx_of_remove, | |
248 | .shutdown = ehci_hcd_xilinx_of_shutdown, | |
4018294b GL |
249 | .driver = { |
250 | .name = "xilinx-of-ehci", | |
251 | .owner = THIS_MODULE, | |
252 | .of_match_table = ehci_hcd_xilinx_of_match, | |
08d3c18e JZ |
253 | }, |
254 | }; |