Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * EHCI HCD (Host Controller Driver) for USB.
4 *
5 * Bus Glue for Xilinx EHCI core on the of_platform bus
6 *
7 * Copyright (c) 2009 Xilinx, Inc.
8 *
9 * Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com>
10 * and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
11 * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
12 */
13
14#include <linux/err.h>
15#include <linux/signal.h>
16
17#include <linux/of.h>
18#include <linux/of_platform.h>
19#include <linux/of_address.h>
20#include <linux/of_irq.h>
21
22/**
23 * ehci_xilinx_port_handed_over - hand the port out if failed to enable it
24 * @hcd: Pointer to the usb_hcd device to which the host controller bound
25 * @portnum:Port number to which the device is attached.
26 *
27 * This function is used as a place to tell the user that the Xilinx USB host
28 * controller does support LS devices. And in an HS only configuration, it
29 * does not support FS devices either. It is hoped that this can help a
30 * confused user.
31 *
32 * There are cases when the host controller fails to enable the port due to,
33 * for example, insufficient power that can be supplied to the device from
34 * the USB bus. In those cases, the messages printed here are not helpful.
35 */
36static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
37{
38 dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
39 if (hcd->has_tt) {
40 dev_warn(hcd->self.controller,
41 "Maybe you have connected a low speed device?\n");
42
43 dev_warn(hcd->self.controller,
44 "We do not support low speed devices\n");
45 } else {
46 dev_warn(hcd->self.controller,
47 "Maybe your device is not a high speed device?\n");
48 dev_warn(hcd->self.controller,
49 "The USB host controller does not support full speed "
50 "nor low speed devices\n");
51 dev_warn(hcd->self.controller,
52 "You can reconfigure the host controller to have "
53 "full speed support\n");
54 }
55
56 return 0;
57}
58
59
60static const struct hc_driver ehci_xilinx_of_hc_driver = {
61 .description = hcd_name,
62 .product_desc = "OF EHCI",
63 .hcd_priv_size = sizeof(struct ehci_hcd),
64
65 /*
66 * generic hardware linkage
67 */
68 .irq = ehci_irq,
69 .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
70
71 /*
72 * basic lifecycle operations
73 */
74 .reset = ehci_setup,
75 .start = ehci_run,
76 .stop = ehci_stop,
77 .shutdown = ehci_shutdown,
78
79 /*
80 * managing i/o requests and associated device resources
81 */
82 .urb_enqueue = ehci_urb_enqueue,
83 .urb_dequeue = ehci_urb_dequeue,
84 .endpoint_disable = ehci_endpoint_disable,
85 .endpoint_reset = ehci_endpoint_reset,
86
87 /*
88 * scheduling support
89 */
90 .get_frame_number = ehci_get_frame,
91
92 /*
93 * root hub support
94 */
95 .hub_status_data = ehci_hub_status_data,
96 .hub_control = ehci_hub_control,
97#ifdef CONFIG_PM
98 .bus_suspend = ehci_bus_suspend,
99 .bus_resume = ehci_bus_resume,
100#endif
101 .relinquish_port = NULL,
102 .port_handed_over = ehci_xilinx_port_handed_over,
103
104 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
105};
106
107/**
108 * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
109 * @op: pointer to the platform_device bound to the host controller
110 *
111 * This function requests resources and sets up appropriate properties for the
112 * host controller. Because the Xilinx USB host controller can be configured
113 * as HS only or HS/FS only, it checks the configuration in the device tree
114 * entry, and sets an appropriate value for hcd->has_tt.
115 */
116static int ehci_hcd_xilinx_of_probe(struct platform_device *op)
117{
118 struct device_node *dn = op->dev.of_node;
119 struct usb_hcd *hcd;
120 struct ehci_hcd *ehci;
121 struct resource res;
122 int irq;
123 int rv;
124 int *value;
125
126 if (usb_disabled())
127 return -ENODEV;
128
129 dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
130
131 rv = of_address_to_resource(dn, 0, &res);
132 if (rv)
133 return rv;
134
135 hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
136 "XILINX-OF USB");
137 if (!hcd)
138 return -ENOMEM;
139
140 hcd->rsrc_start = res.start;
141 hcd->rsrc_len = resource_size(&res);
142
143 irq = irq_of_parse_and_map(dn, 0);
144 if (!irq) {
145 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
146 __FILE__);
147 rv = -EBUSY;
148 goto err_irq;
149 }
150
151 hcd->regs = devm_ioremap_resource(&op->dev, &res);
152 if (IS_ERR(hcd->regs)) {
153 rv = PTR_ERR(hcd->regs);
154 goto err_irq;
155 }
156
157 ehci = hcd_to_ehci(hcd);
158
159 /* This core always has big-endian register interface and uses
160 * big-endian memory descriptors.
161 */
162 ehci->big_endian_mmio = 1;
163 ehci->big_endian_desc = 1;
164
165 /* Check whether the FS support option is selected in the hardware.
166 */
167 value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
168 if (value && (*value == 1)) {
169 ehci_dbg(ehci, "USB host controller supports FS devices\n");
170 hcd->has_tt = 1;
171 } else {
172 ehci_dbg(ehci,
173 "USB host controller is HS only\n");
174 hcd->has_tt = 0;
175 }
176
177 /* Debug registers are at the first 0x100 region
178 */
179 ehci->caps = hcd->regs + 0x100;
180
181 rv = usb_add_hcd(hcd, irq, 0);
182 if (rv == 0) {
183 device_wakeup_enable(hcd->self.controller);
184 return 0;
185 }
186
187err_irq:
188 usb_put_hcd(hcd);
189
190 return rv;
191}
192
193/**
194 * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
195 * @op: pointer to platform_device structure that is to be removed
196 *
197 * Remove the hcd structure, and release resources that has been requested
198 * during probe.
199 */
200static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
201{
202 struct usb_hcd *hcd = platform_get_drvdata(op);
203
204 dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
205
206 usb_remove_hcd(hcd);
207
208 usb_put_hcd(hcd);
209
210 return 0;
211}
212
213static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
214 {.compatible = "xlnx,xps-usb-host-1.00.a",},
215 {},
216};
217MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
218
219static struct platform_driver ehci_hcd_xilinx_of_driver = {
220 .probe = ehci_hcd_xilinx_of_probe,
221 .remove = ehci_hcd_xilinx_of_remove,
222 .shutdown = usb_hcd_platform_shutdown,
223 .driver = {
224 .name = "xilinx-of-ehci",
225 .of_match_table = ehci_hcd_xilinx_of_match,
226 },
227};
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/err.h>
29#include <linux/signal.h>
30
31#include <linux/of.h>
32#include <linux/of_platform.h>
33#include <linux/of_address.h>
34
35/**
36 * ehci_xilinx_port_handed_over - hand the port out if failed to enable it
37 * @hcd: Pointer to the usb_hcd device to which the host controller bound
38 * @portnum:Port number to which the device is attached.
39 *
40 * This function is used as a place to tell the user that the Xilinx USB host
41 * controller does support LS devices. And in an HS only configuration, it
42 * does not support FS devices either. It is hoped that this can help a
43 * confused user.
44 *
45 * There are cases when the host controller fails to enable the port due to,
46 * for example, insufficient power that can be supplied to the device from
47 * the USB bus. In those cases, the messages printed here are not helpful.
48 */
49static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
50{
51 dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
52 if (hcd->has_tt) {
53 dev_warn(hcd->self.controller,
54 "Maybe you have connected a low speed device?\n");
55
56 dev_warn(hcd->self.controller,
57 "We do not support low speed devices\n");
58 } else {
59 dev_warn(hcd->self.controller,
60 "Maybe your device is not a high speed device?\n");
61 dev_warn(hcd->self.controller,
62 "The USB host controller does not support full speed "
63 "nor low speed devices\n");
64 dev_warn(hcd->self.controller,
65 "You can reconfigure the host controller to have "
66 "full speed support\n");
67 }
68
69 return 0;
70}
71
72
73static const struct hc_driver ehci_xilinx_of_hc_driver = {
74 .description = hcd_name,
75 .product_desc = "OF EHCI",
76 .hcd_priv_size = sizeof(struct ehci_hcd),
77
78 /*
79 * generic hardware linkage
80 */
81 .irq = ehci_irq,
82 .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
83
84 /*
85 * basic lifecycle operations
86 */
87 .reset = ehci_setup,
88 .start = ehci_run,
89 .stop = ehci_stop,
90 .shutdown = ehci_shutdown,
91
92 /*
93 * managing i/o requests and associated device resources
94 */
95 .urb_enqueue = ehci_urb_enqueue,
96 .urb_dequeue = ehci_urb_dequeue,
97 .endpoint_disable = ehci_endpoint_disable,
98 .endpoint_reset = ehci_endpoint_reset,
99
100 /*
101 * scheduling support
102 */
103 .get_frame_number = ehci_get_frame,
104
105 /*
106 * root hub support
107 */
108 .hub_status_data = ehci_hub_status_data,
109 .hub_control = ehci_hub_control,
110#ifdef CONFIG_PM
111 .bus_suspend = ehci_bus_suspend,
112 .bus_resume = ehci_bus_resume,
113#endif
114 .relinquish_port = NULL,
115 .port_handed_over = ehci_xilinx_port_handed_over,
116
117 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
118};
119
120/**
121 * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
122 * @op: pointer to the platform_device bound to the host controller
123 *
124 * This function requests resources and sets up appropriate properties for the
125 * host controller. Because the Xilinx USB host controller can be configured
126 * as HS only or HS/FS only, it checks the configuration in the device tree
127 * entry, and sets an appropriate value for hcd->has_tt.
128 */
129static int ehci_hcd_xilinx_of_probe(struct platform_device *op)
130{
131 struct device_node *dn = op->dev.of_node;
132 struct usb_hcd *hcd;
133 struct ehci_hcd *ehci;
134 struct resource res;
135 int irq;
136 int rv;
137 int *value;
138
139 if (usb_disabled())
140 return -ENODEV;
141
142 dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
143
144 rv = of_address_to_resource(dn, 0, &res);
145 if (rv)
146 return rv;
147
148 hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
149 "XILINX-OF USB");
150 if (!hcd)
151 return -ENOMEM;
152
153 hcd->rsrc_start = res.start;
154 hcd->rsrc_len = resource_size(&res);
155
156 irq = irq_of_parse_and_map(dn, 0);
157 if (!irq) {
158 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
159 __FILE__);
160 rv = -EBUSY;
161 goto err_irq;
162 }
163
164 hcd->regs = devm_ioremap_resource(&op->dev, &res);
165 if (IS_ERR(hcd->regs)) {
166 rv = PTR_ERR(hcd->regs);
167 goto err_irq;
168 }
169
170 ehci = hcd_to_ehci(hcd);
171
172 /* This core always has big-endian register interface and uses
173 * big-endian memory descriptors.
174 */
175 ehci->big_endian_mmio = 1;
176 ehci->big_endian_desc = 1;
177
178 /* Check whether the FS support option is selected in the hardware.
179 */
180 value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
181 if (value && (*value == 1)) {
182 ehci_dbg(ehci, "USB host controller supports FS devices\n");
183 hcd->has_tt = 1;
184 } else {
185 ehci_dbg(ehci,
186 "USB host controller is HS only\n");
187 hcd->has_tt = 0;
188 }
189
190 /* Debug registers are at the first 0x100 region
191 */
192 ehci->caps = hcd->regs + 0x100;
193
194 rv = usb_add_hcd(hcd, irq, 0);
195 if (rv == 0) {
196 device_wakeup_enable(hcd->self.controller);
197 return 0;
198 }
199
200err_irq:
201 usb_put_hcd(hcd);
202
203 return rv;
204}
205
206/**
207 * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
208 * @op: pointer to platform_device structure that is to be removed
209 *
210 * Remove the hcd structure, and release resources that has been requested
211 * during probe.
212 */
213static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
214{
215 struct usb_hcd *hcd = platform_get_drvdata(op);
216
217 dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
218
219 usb_remove_hcd(hcd);
220
221 usb_put_hcd(hcd);
222
223 return 0;
224}
225
226static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
227 {.compatible = "xlnx,xps-usb-host-1.00.a",},
228 {},
229};
230MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
231
232static struct platform_driver ehci_hcd_xilinx_of_driver = {
233 .probe = ehci_hcd_xilinx_of_probe,
234 .remove = ehci_hcd_xilinx_of_remove,
235 .shutdown = usb_hcd_platform_shutdown,
236 .driver = {
237 .name = "xilinx-of-ehci",
238 .owner = THIS_MODULE,
239 .of_match_table = ehci_hcd_xilinx_of_match,
240 },
241};