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1/*
2 * SAMSUNG EXYNOS USB HOST OHCI Controller
3 *
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 */
13
14#include <linux/clk.h>
15#include <linux/dma-mapping.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/phy/phy.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include "ohci.h"
26
27#define DRIVER_DESC "OHCI EXYNOS driver"
28
29static const char hcd_name[] = "ohci-exynos";
30static struct hc_driver __read_mostly exynos_ohci_hc_driver;
31
32#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
33
34#define PHY_NUMBER 3
35
36struct exynos_ohci_hcd {
37 struct clk *clk;
38 struct phy *phy[PHY_NUMBER];
39};
40
41static int exynos_ohci_get_phy(struct device *dev,
42 struct exynos_ohci_hcd *exynos_ohci)
43{
44 struct device_node *child;
45 struct phy *phy;
46 int phy_number;
47 int ret;
48
49 /* Get PHYs for the controller */
50 for_each_available_child_of_node(dev->of_node, child) {
51 ret = of_property_read_u32(child, "reg", &phy_number);
52 if (ret) {
53 dev_err(dev, "Failed to parse device tree\n");
54 of_node_put(child);
55 return ret;
56 }
57
58 if (phy_number >= PHY_NUMBER) {
59 dev_err(dev, "Invalid number of PHYs\n");
60 of_node_put(child);
61 return -EINVAL;
62 }
63
64 phy = devm_of_phy_get(dev, child, NULL);
65 exynos_ohci->phy[phy_number] = phy;
66 if (IS_ERR(phy)) {
67 ret = PTR_ERR(phy);
68 if (ret == -EPROBE_DEFER) {
69 return ret;
70 } else if (ret != -ENOSYS && ret != -ENODEV) {
71 dev_err(dev,
72 "Error retrieving usb2 phy: %d\n", ret);
73 return ret;
74 }
75 }
76 }
77
78 return 0;
79}
80
81static int exynos_ohci_phy_enable(struct device *dev)
82{
83 struct usb_hcd *hcd = dev_get_drvdata(dev);
84 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
85 int i;
86 int ret = 0;
87
88 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
89 if (!IS_ERR(exynos_ohci->phy[i]))
90 ret = phy_power_on(exynos_ohci->phy[i]);
91 if (ret)
92 for (i--; i >= 0; i--)
93 if (!IS_ERR(exynos_ohci->phy[i]))
94 phy_power_off(exynos_ohci->phy[i]);
95
96 return ret;
97}
98
99static void exynos_ohci_phy_disable(struct device *dev)
100{
101 struct usb_hcd *hcd = dev_get_drvdata(dev);
102 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
103 int i;
104
105 for (i = 0; i < PHY_NUMBER; i++)
106 if (!IS_ERR(exynos_ohci->phy[i]))
107 phy_power_off(exynos_ohci->phy[i]);
108}
109
110static int exynos_ohci_probe(struct platform_device *pdev)
111{
112 struct exynos_ohci_hcd *exynos_ohci;
113 struct usb_hcd *hcd;
114 struct resource *res;
115 int irq;
116 int err;
117
118 /*
119 * Right now device-tree probed devices don't get dma_mask set.
120 * Since shared usb code relies on it, set it here for now.
121 * Once we move to full device tree support this will vanish off.
122 */
123 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
124 if (err)
125 return err;
126
127 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
128 &pdev->dev, dev_name(&pdev->dev));
129 if (!hcd) {
130 dev_err(&pdev->dev, "Unable to create HCD\n");
131 return -ENOMEM;
132 }
133
134 exynos_ohci = to_exynos_ohci(hcd);
135
136 if (of_device_is_compatible(pdev->dev.of_node,
137 "samsung,exynos5440-ohci"))
138 goto skip_phy;
139
140 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
141 if (err)
142 goto fail_clk;
143
144skip_phy:
145 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
146
147 if (IS_ERR(exynos_ohci->clk)) {
148 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
149 err = PTR_ERR(exynos_ohci->clk);
150 goto fail_clk;
151 }
152
153 err = clk_prepare_enable(exynos_ohci->clk);
154 if (err)
155 goto fail_clk;
156
157 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
158 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
159 if (IS_ERR(hcd->regs)) {
160 err = PTR_ERR(hcd->regs);
161 goto fail_io;
162 }
163 hcd->rsrc_start = res->start;
164 hcd->rsrc_len = resource_size(res);
165
166 irq = platform_get_irq(pdev, 0);
167 if (!irq) {
168 dev_err(&pdev->dev, "Failed to get IRQ\n");
169 err = -ENODEV;
170 goto fail_io;
171 }
172
173 platform_set_drvdata(pdev, hcd);
174
175 err = exynos_ohci_phy_enable(&pdev->dev);
176 if (err) {
177 dev_err(&pdev->dev, "Failed to enable USB phy\n");
178 goto fail_io;
179 }
180
181 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
182 if (err) {
183 dev_err(&pdev->dev, "Failed to add USB HCD\n");
184 goto fail_add_hcd;
185 }
186 device_wakeup_enable(hcd->self.controller);
187 return 0;
188
189fail_add_hcd:
190 exynos_ohci_phy_disable(&pdev->dev);
191fail_io:
192 clk_disable_unprepare(exynos_ohci->clk);
193fail_clk:
194 usb_put_hcd(hcd);
195 return err;
196}
197
198static int exynos_ohci_remove(struct platform_device *pdev)
199{
200 struct usb_hcd *hcd = platform_get_drvdata(pdev);
201 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
202
203 usb_remove_hcd(hcd);
204
205 exynos_ohci_phy_disable(&pdev->dev);
206
207 clk_disable_unprepare(exynos_ohci->clk);
208
209 usb_put_hcd(hcd);
210
211 return 0;
212}
213
214static void exynos_ohci_shutdown(struct platform_device *pdev)
215{
216 struct usb_hcd *hcd = platform_get_drvdata(pdev);
217
218 if (hcd->driver->shutdown)
219 hcd->driver->shutdown(hcd);
220}
221
222#ifdef CONFIG_PM
223static int exynos_ohci_suspend(struct device *dev)
224{
225 struct usb_hcd *hcd = dev_get_drvdata(dev);
226 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
227 bool do_wakeup = device_may_wakeup(dev);
228 int rc = ohci_suspend(hcd, do_wakeup);
229
230 if (rc)
231 return rc;
232
233 exynos_ohci_phy_disable(dev);
234
235 clk_disable_unprepare(exynos_ohci->clk);
236
237 return 0;
238}
239
240static int exynos_ohci_resume(struct device *dev)
241{
242 struct usb_hcd *hcd = dev_get_drvdata(dev);
243 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
244 int ret;
245
246 clk_prepare_enable(exynos_ohci->clk);
247
248 ret = exynos_ohci_phy_enable(dev);
249 if (ret) {
250 dev_err(dev, "Failed to enable USB phy\n");
251 clk_disable_unprepare(exynos_ohci->clk);
252 return ret;
253 }
254
255 ohci_resume(hcd, false);
256
257 return 0;
258}
259#else
260#define exynos_ohci_suspend NULL
261#define exynos_ohci_resume NULL
262#endif
263
264static const struct ohci_driver_overrides exynos_overrides __initconst = {
265 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
266};
267
268static const struct dev_pm_ops exynos_ohci_pm_ops = {
269 .suspend = exynos_ohci_suspend,
270 .resume = exynos_ohci_resume,
271};
272
273#ifdef CONFIG_OF
274static const struct of_device_id exynos_ohci_match[] = {
275 { .compatible = "samsung,exynos4210-ohci" },
276 { .compatible = "samsung,exynos5440-ohci" },
277 {},
278};
279MODULE_DEVICE_TABLE(of, exynos_ohci_match);
280#endif
281
282static struct platform_driver exynos_ohci_driver = {
283 .probe = exynos_ohci_probe,
284 .remove = exynos_ohci_remove,
285 .shutdown = exynos_ohci_shutdown,
286 .driver = {
287 .name = "exynos-ohci",
288 .pm = &exynos_ohci_pm_ops,
289 .of_match_table = of_match_ptr(exynos_ohci_match),
290 }
291};
292static int __init ohci_exynos_init(void)
293{
294 if (usb_disabled())
295 return -ENODEV;
296
297 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
298 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
299 return platform_driver_register(&exynos_ohci_driver);
300}
301module_init(ohci_exynos_init);
302
303static void __exit ohci_exynos_cleanup(void)
304{
305 platform_driver_unregister(&exynos_ohci_driver);
306}
307module_exit(ohci_exynos_cleanup);
308
309MODULE_ALIAS("platform:exynos-ohci");
310MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
311MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * SAMSUNG EXYNOS USB HOST OHCI Controller
4 *
5 * Copyright (C) 2011 Samsung Electronics Co.Ltd
6 * Author: Jingoo Han <jg1.han@samsung.com>
7 */
8
9#include <linux/clk.h>
10#include <linux/dma-mapping.h>
11#include <linux/io.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <linux/phy/phy.h>
17#include <linux/usb.h>
18#include <linux/usb/hcd.h>
19
20#include "ohci.h"
21
22#define DRIVER_DESC "OHCI EXYNOS driver"
23
24static const char hcd_name[] = "ohci-exynos";
25static struct hc_driver __read_mostly exynos_ohci_hc_driver;
26
27#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
28
29#define PHY_NUMBER 3
30
31struct exynos_ohci_hcd {
32 struct clk *clk;
33 struct phy *phy[PHY_NUMBER];
34};
35
36static int exynos_ohci_get_phy(struct device *dev,
37 struct exynos_ohci_hcd *exynos_ohci)
38{
39 struct device_node *child;
40 struct phy *phy;
41 int phy_number;
42 int ret;
43
44 /* Get PHYs for the controller */
45 for_each_available_child_of_node(dev->of_node, child) {
46 ret = of_property_read_u32(child, "reg", &phy_number);
47 if (ret) {
48 dev_err(dev, "Failed to parse device tree\n");
49 of_node_put(child);
50 return ret;
51 }
52
53 if (phy_number >= PHY_NUMBER) {
54 dev_err(dev, "Invalid number of PHYs\n");
55 of_node_put(child);
56 return -EINVAL;
57 }
58
59 phy = devm_of_phy_get(dev, child, NULL);
60 exynos_ohci->phy[phy_number] = phy;
61 if (IS_ERR(phy)) {
62 ret = PTR_ERR(phy);
63 if (ret == -EPROBE_DEFER) {
64 of_node_put(child);
65 return ret;
66 } else if (ret != -ENOSYS && ret != -ENODEV) {
67 dev_err(dev,
68 "Error retrieving usb2 phy: %d\n", ret);
69 of_node_put(child);
70 return ret;
71 }
72 }
73 }
74
75 return 0;
76}
77
78static int exynos_ohci_phy_enable(struct device *dev)
79{
80 struct usb_hcd *hcd = dev_get_drvdata(dev);
81 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
82 int i;
83 int ret = 0;
84
85 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
86 if (!IS_ERR(exynos_ohci->phy[i]))
87 ret = phy_power_on(exynos_ohci->phy[i]);
88 if (ret)
89 for (i--; i >= 0; i--)
90 if (!IS_ERR(exynos_ohci->phy[i]))
91 phy_power_off(exynos_ohci->phy[i]);
92
93 return ret;
94}
95
96static void exynos_ohci_phy_disable(struct device *dev)
97{
98 struct usb_hcd *hcd = dev_get_drvdata(dev);
99 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
100 int i;
101
102 for (i = 0; i < PHY_NUMBER; i++)
103 if (!IS_ERR(exynos_ohci->phy[i]))
104 phy_power_off(exynos_ohci->phy[i]);
105}
106
107static int exynos_ohci_probe(struct platform_device *pdev)
108{
109 struct exynos_ohci_hcd *exynos_ohci;
110 struct usb_hcd *hcd;
111 struct resource *res;
112 int irq;
113 int err;
114
115 /*
116 * Right now device-tree probed devices don't get dma_mask set.
117 * Since shared usb code relies on it, set it here for now.
118 * Once we move to full device tree support this will vanish off.
119 */
120 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
121 if (err)
122 return err;
123
124 hcd = usb_create_hcd(&exynos_ohci_hc_driver,
125 &pdev->dev, dev_name(&pdev->dev));
126 if (!hcd) {
127 dev_err(&pdev->dev, "Unable to create HCD\n");
128 return -ENOMEM;
129 }
130
131 exynos_ohci = to_exynos_ohci(hcd);
132
133 if (of_device_is_compatible(pdev->dev.of_node,
134 "samsung,exynos5440-ohci"))
135 goto skip_phy;
136
137 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
138 if (err)
139 goto fail_clk;
140
141skip_phy:
142 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
143
144 if (IS_ERR(exynos_ohci->clk)) {
145 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
146 err = PTR_ERR(exynos_ohci->clk);
147 goto fail_clk;
148 }
149
150 err = clk_prepare_enable(exynos_ohci->clk);
151 if (err)
152 goto fail_clk;
153
154 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
155 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
156 if (IS_ERR(hcd->regs)) {
157 err = PTR_ERR(hcd->regs);
158 goto fail_io;
159 }
160 hcd->rsrc_start = res->start;
161 hcd->rsrc_len = resource_size(res);
162
163 irq = platform_get_irq(pdev, 0);
164 if (!irq) {
165 dev_err(&pdev->dev, "Failed to get IRQ\n");
166 err = -ENODEV;
167 goto fail_io;
168 }
169
170 platform_set_drvdata(pdev, hcd);
171
172 err = exynos_ohci_phy_enable(&pdev->dev);
173 if (err) {
174 dev_err(&pdev->dev, "Failed to enable USB phy\n");
175 goto fail_io;
176 }
177
178 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
179 if (err) {
180 dev_err(&pdev->dev, "Failed to add USB HCD\n");
181 goto fail_add_hcd;
182 }
183 device_wakeup_enable(hcd->self.controller);
184 return 0;
185
186fail_add_hcd:
187 exynos_ohci_phy_disable(&pdev->dev);
188fail_io:
189 clk_disable_unprepare(exynos_ohci->clk);
190fail_clk:
191 usb_put_hcd(hcd);
192 return err;
193}
194
195static int exynos_ohci_remove(struct platform_device *pdev)
196{
197 struct usb_hcd *hcd = platform_get_drvdata(pdev);
198 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
199
200 usb_remove_hcd(hcd);
201
202 exynos_ohci_phy_disable(&pdev->dev);
203
204 clk_disable_unprepare(exynos_ohci->clk);
205
206 usb_put_hcd(hcd);
207
208 return 0;
209}
210
211static void exynos_ohci_shutdown(struct platform_device *pdev)
212{
213 struct usb_hcd *hcd = platform_get_drvdata(pdev);
214
215 if (hcd->driver->shutdown)
216 hcd->driver->shutdown(hcd);
217}
218
219#ifdef CONFIG_PM
220static int exynos_ohci_suspend(struct device *dev)
221{
222 struct usb_hcd *hcd = dev_get_drvdata(dev);
223 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
224 bool do_wakeup = device_may_wakeup(dev);
225 int rc = ohci_suspend(hcd, do_wakeup);
226
227 if (rc)
228 return rc;
229
230 exynos_ohci_phy_disable(dev);
231
232 clk_disable_unprepare(exynos_ohci->clk);
233
234 return 0;
235}
236
237static int exynos_ohci_resume(struct device *dev)
238{
239 struct usb_hcd *hcd = dev_get_drvdata(dev);
240 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
241 int ret;
242
243 clk_prepare_enable(exynos_ohci->clk);
244
245 ret = exynos_ohci_phy_enable(dev);
246 if (ret) {
247 dev_err(dev, "Failed to enable USB phy\n");
248 clk_disable_unprepare(exynos_ohci->clk);
249 return ret;
250 }
251
252 ohci_resume(hcd, false);
253
254 return 0;
255}
256#else
257#define exynos_ohci_suspend NULL
258#define exynos_ohci_resume NULL
259#endif
260
261static const struct ohci_driver_overrides exynos_overrides __initconst = {
262 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
263};
264
265static const struct dev_pm_ops exynos_ohci_pm_ops = {
266 .suspend = exynos_ohci_suspend,
267 .resume = exynos_ohci_resume,
268};
269
270#ifdef CONFIG_OF
271static const struct of_device_id exynos_ohci_match[] = {
272 { .compatible = "samsung,exynos4210-ohci" },
273 { .compatible = "samsung,exynos5440-ohci" },
274 {},
275};
276MODULE_DEVICE_TABLE(of, exynos_ohci_match);
277#endif
278
279static struct platform_driver exynos_ohci_driver = {
280 .probe = exynos_ohci_probe,
281 .remove = exynos_ohci_remove,
282 .shutdown = exynos_ohci_shutdown,
283 .driver = {
284 .name = "exynos-ohci",
285 .pm = &exynos_ohci_pm_ops,
286 .of_match_table = of_match_ptr(exynos_ohci_match),
287 }
288};
289static int __init ohci_exynos_init(void)
290{
291 if (usb_disabled())
292 return -ENODEV;
293
294 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
295 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
296 return platform_driver_register(&exynos_ohci_driver);
297}
298module_init(ohci_exynos_init);
299
300static void __exit ohci_exynos_cleanup(void)
301{
302 platform_driver_unregister(&exynos_ohci_driver);
303}
304module_exit(ohci_exynos_cleanup);
305
306MODULE_ALIAS("platform:exynos-ohci");
307MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
308MODULE_LICENSE("GPL v2");