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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 struct hc_driver __read_mostly exynos_ohci_hc_driver;
25
26#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
27
28#define PHY_NUMBER 3
29
30struct exynos_ohci_hcd {
31 struct clk *clk;
32 struct device_node *of_node;
33 struct phy *phy[PHY_NUMBER];
34 bool legacy_phy;
35};
36
37static int exynos_ohci_get_phy(struct device *dev,
38 struct exynos_ohci_hcd *exynos_ohci)
39{
40 struct device_node *child;
41 struct phy *phy;
42 int phy_number, num_phys;
43 int ret;
44
45 /* Get PHYs for the controller */
46 num_phys = of_count_phandle_with_args(dev->of_node, "phys",
47 "#phy-cells");
48 for (phy_number = 0; phy_number < num_phys; phy_number++) {
49 phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
50 if (IS_ERR(phy))
51 return PTR_ERR(phy);
52 exynos_ohci->phy[phy_number] = phy;
53 }
54 if (num_phys > 0)
55 return 0;
56
57 /* Get PHYs using legacy bindings */
58 for_each_available_child_of_node(dev->of_node, child) {
59 ret = of_property_read_u32(child, "reg", &phy_number);
60 if (ret) {
61 dev_err(dev, "Failed to parse device tree\n");
62 of_node_put(child);
63 return ret;
64 }
65
66 if (phy_number >= PHY_NUMBER) {
67 dev_err(dev, "Invalid number of PHYs\n");
68 of_node_put(child);
69 return -EINVAL;
70 }
71
72 phy = devm_of_phy_optional_get(dev, child, NULL);
73 exynos_ohci->phy[phy_number] = phy;
74 if (IS_ERR(phy)) {
75 of_node_put(child);
76 return PTR_ERR(phy);
77 }
78 }
79
80 exynos_ohci->legacy_phy = true;
81 return 0;
82}
83
84static int exynos_ohci_phy_enable(struct device *dev)
85{
86 struct usb_hcd *hcd = dev_get_drvdata(dev);
87 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
88 int i;
89 int ret = 0;
90
91 for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
92 ret = phy_power_on(exynos_ohci->phy[i]);
93 if (ret)
94 for (i--; i >= 0; i--)
95 phy_power_off(exynos_ohci->phy[i]);
96
97 return ret;
98}
99
100static void exynos_ohci_phy_disable(struct device *dev)
101{
102 struct usb_hcd *hcd = dev_get_drvdata(dev);
103 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
104 int i;
105
106 for (i = 0; i < PHY_NUMBER; 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 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
137 if (err)
138 goto fail_clk;
139
140 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
141
142 if (IS_ERR(exynos_ohci->clk)) {
143 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
144 err = PTR_ERR(exynos_ohci->clk);
145 goto fail_clk;
146 }
147
148 err = clk_prepare_enable(exynos_ohci->clk);
149 if (err)
150 goto fail_clk;
151
152 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
153 if (IS_ERR(hcd->regs)) {
154 err = PTR_ERR(hcd->regs);
155 goto fail_io;
156 }
157 hcd->rsrc_start = res->start;
158 hcd->rsrc_len = resource_size(res);
159
160 irq = platform_get_irq(pdev, 0);
161 if (irq < 0) {
162 err = irq;
163 goto fail_io;
164 }
165
166 platform_set_drvdata(pdev, hcd);
167
168 err = exynos_ohci_phy_enable(&pdev->dev);
169 if (err) {
170 dev_err(&pdev->dev, "Failed to enable USB phy\n");
171 goto fail_io;
172 }
173
174 /*
175 * Workaround: reset of_node pointer to avoid conflict between legacy
176 * Exynos OHCI port subnodes and generic USB device bindings
177 */
178 exynos_ohci->of_node = pdev->dev.of_node;
179 if (exynos_ohci->legacy_phy)
180 pdev->dev.of_node = NULL;
181
182 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
183 if (err) {
184 dev_err(&pdev->dev, "Failed to add USB HCD\n");
185 goto fail_add_hcd;
186 }
187 device_wakeup_enable(hcd->self.controller);
188 return 0;
189
190fail_add_hcd:
191 exynos_ohci_phy_disable(&pdev->dev);
192 pdev->dev.of_node = exynos_ohci->of_node;
193fail_io:
194 clk_disable_unprepare(exynos_ohci->clk);
195fail_clk:
196 usb_put_hcd(hcd);
197 return err;
198}
199
200static void exynos_ohci_remove(struct platform_device *pdev)
201{
202 struct usb_hcd *hcd = platform_get_drvdata(pdev);
203 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
204
205 pdev->dev.of_node = exynos_ohci->of_node;
206
207 usb_remove_hcd(hcd);
208
209 exynos_ohci_phy_disable(&pdev->dev);
210
211 clk_disable_unprepare(exynos_ohci->clk);
212
213 usb_put_hcd(hcd);
214}
215
216static void exynos_ohci_shutdown(struct platform_device *pdev)
217{
218 struct usb_hcd *hcd = platform_get_drvdata(pdev);
219
220 if (hcd->driver->shutdown)
221 hcd->driver->shutdown(hcd);
222}
223
224#ifdef CONFIG_PM
225static int exynos_ohci_suspend(struct device *dev)
226{
227 struct usb_hcd *hcd = dev_get_drvdata(dev);
228 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
229 bool do_wakeup = device_may_wakeup(dev);
230 int rc = ohci_suspend(hcd, do_wakeup);
231
232 if (rc)
233 return rc;
234
235 exynos_ohci_phy_disable(dev);
236
237 clk_disable_unprepare(exynos_ohci->clk);
238
239 return 0;
240}
241
242static int exynos_ohci_resume(struct device *dev)
243{
244 struct usb_hcd *hcd = dev_get_drvdata(dev);
245 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
246 int ret;
247
248 clk_prepare_enable(exynos_ohci->clk);
249
250 ret = exynos_ohci_phy_enable(dev);
251 if (ret) {
252 dev_err(dev, "Failed to enable USB phy\n");
253 clk_disable_unprepare(exynos_ohci->clk);
254 return ret;
255 }
256
257 ohci_resume(hcd, false);
258
259 return 0;
260}
261#else
262#define exynos_ohci_suspend NULL
263#define exynos_ohci_resume NULL
264#endif
265
266static const struct ohci_driver_overrides exynos_overrides __initconst = {
267 .extra_priv_size = sizeof(struct exynos_ohci_hcd),
268};
269
270static const struct dev_pm_ops exynos_ohci_pm_ops = {
271 .suspend = exynos_ohci_suspend,
272 .resume = exynos_ohci_resume,
273};
274
275#ifdef CONFIG_OF
276static const struct of_device_id exynos_ohci_match[] = {
277 { .compatible = "samsung,exynos4210-ohci" },
278 {},
279};
280MODULE_DEVICE_TABLE(of, exynos_ohci_match);
281#endif
282
283static struct platform_driver exynos_ohci_driver = {
284 .probe = exynos_ohci_probe,
285 .remove_new = exynos_ohci_remove,
286 .shutdown = exynos_ohci_shutdown,
287 .driver = {
288 .name = "exynos-ohci",
289 .pm = &exynos_ohci_pm_ops,
290 .of_match_table = of_match_ptr(exynos_ohci_match),
291 }
292};
293static int __init ohci_exynos_init(void)
294{
295 if (usb_disabled())
296 return -ENODEV;
297
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");