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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/*
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/platform_device.h>
16#include <mach/ohci.h>
17#include <plat/usb-phy.h>
18
19struct exynos_ohci_hcd {
20 struct device *dev;
21 struct usb_hcd *hcd;
22 struct clk *clk;
23};
24
25static int ohci_exynos_start(struct usb_hcd *hcd)
26{
27 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
28 int ret;
29
30 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
31
32 ret = ohci_init(ohci);
33 if (ret < 0)
34 return ret;
35
36 ret = ohci_run(ohci);
37 if (ret < 0) {
38 dev_err(hcd->self.controller, "can't start %s\n",
39 hcd->self.bus_name);
40 ohci_stop(hcd);
41 return ret;
42 }
43
44 return 0;
45}
46
47static const struct hc_driver exynos_ohci_hc_driver = {
48 .description = hcd_name,
49 .product_desc = "EXYNOS OHCI Host Controller",
50 .hcd_priv_size = sizeof(struct ohci_hcd),
51
52 .irq = ohci_irq,
53 .flags = HCD_MEMORY|HCD_USB11,
54
55 .start = ohci_exynos_start,
56 .stop = ohci_stop,
57 .shutdown = ohci_shutdown,
58
59 .get_frame_number = ohci_get_frame,
60
61 .urb_enqueue = ohci_urb_enqueue,
62 .urb_dequeue = ohci_urb_dequeue,
63 .endpoint_disable = ohci_endpoint_disable,
64
65 .hub_status_data = ohci_hub_status_data,
66 .hub_control = ohci_hub_control,
67#ifdef CONFIG_PM
68 .bus_suspend = ohci_bus_suspend,
69 .bus_resume = ohci_bus_resume,
70#endif
71 .start_port_reset = ohci_start_port_reset,
72};
73
74static int __devinit exynos_ohci_probe(struct platform_device *pdev)
75{
76 struct exynos4_ohci_platdata *pdata;
77 struct exynos_ohci_hcd *exynos_ohci;
78 struct usb_hcd *hcd;
79 struct ohci_hcd *ohci;
80 struct resource *res;
81 int irq;
82 int err;
83
84 pdata = pdev->dev.platform_data;
85 if (!pdata) {
86 dev_err(&pdev->dev, "No platform data defined\n");
87 return -EINVAL;
88 }
89
90 exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
91 if (!exynos_ohci)
92 return -ENOMEM;
93
94 exynos_ohci->dev = &pdev->dev;
95
96 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
97 dev_name(&pdev->dev));
98 if (!hcd) {
99 dev_err(&pdev->dev, "Unable to create HCD\n");
100 err = -ENOMEM;
101 goto fail_hcd;
102 }
103
104 exynos_ohci->hcd = hcd;
105 exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
106
107 if (IS_ERR(exynos_ohci->clk)) {
108 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
109 err = PTR_ERR(exynos_ohci->clk);
110 goto fail_clk;
111 }
112
113 err = clk_enable(exynos_ohci->clk);
114 if (err)
115 goto fail_clken;
116
117 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
118 if (!res) {
119 dev_err(&pdev->dev, "Failed to get I/O memory\n");
120 err = -ENXIO;
121 goto fail_io;
122 }
123
124 hcd->rsrc_start = res->start;
125 hcd->rsrc_len = resource_size(res);
126 hcd->regs = ioremap(res->start, resource_size(res));
127 if (!hcd->regs) {
128 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
129 err = -ENOMEM;
130 goto fail_io;
131 }
132
133 irq = platform_get_irq(pdev, 0);
134 if (!irq) {
135 dev_err(&pdev->dev, "Failed to get IRQ\n");
136 err = -ENODEV;
137 goto fail;
138 }
139
140 if (pdata->phy_init)
141 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
142
143 ohci = hcd_to_ohci(hcd);
144 ohci_hcd_init(ohci);
145
146 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
147 if (err) {
148 dev_err(&pdev->dev, "Failed to add USB HCD\n");
149 goto fail;
150 }
151
152 platform_set_drvdata(pdev, exynos_ohci);
153
154 return 0;
155
156fail:
157 iounmap(hcd->regs);
158fail_io:
159 clk_disable(exynos_ohci->clk);
160fail_clken:
161 clk_put(exynos_ohci->clk);
162fail_clk:
163 usb_put_hcd(hcd);
164fail_hcd:
165 kfree(exynos_ohci);
166 return err;
167}
168
169static int __devexit exynos_ohci_remove(struct platform_device *pdev)
170{
171 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
172 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
173 struct usb_hcd *hcd = exynos_ohci->hcd;
174
175 usb_remove_hcd(hcd);
176
177 if (pdata && pdata->phy_exit)
178 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
179
180 iounmap(hcd->regs);
181
182 clk_disable(exynos_ohci->clk);
183 clk_put(exynos_ohci->clk);
184
185 usb_put_hcd(hcd);
186 kfree(exynos_ohci);
187
188 return 0;
189}
190
191static void exynos_ohci_shutdown(struct platform_device *pdev)
192{
193 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
194 struct usb_hcd *hcd = exynos_ohci->hcd;
195
196 if (hcd->driver->shutdown)
197 hcd->driver->shutdown(hcd);
198}
199
200#ifdef CONFIG_PM
201static int exynos_ohci_suspend(struct device *dev)
202{
203 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
204 struct usb_hcd *hcd = exynos_ohci->hcd;
205 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
206 struct platform_device *pdev = to_platform_device(dev);
207 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
208 unsigned long flags;
209 int rc = 0;
210
211 /*
212 * Root hub was already suspended. Disable irq emission and
213 * mark HW unaccessible, bail out if RH has been resumed. Use
214 * the spinlock to properly synchronize with possible pending
215 * RH suspend or resume activity.
216 */
217 spin_lock_irqsave(&ohci->lock, flags);
218 if (ohci->rh_state != OHCI_RH_SUSPENDED &&
219 ohci->rh_state != OHCI_RH_HALTED) {
220 rc = -EINVAL;
221 goto fail;
222 }
223
224 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
225
226 if (pdata && pdata->phy_exit)
227 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
228fail:
229 spin_unlock_irqrestore(&ohci->lock, flags);
230
231 return rc;
232}
233
234static int exynos_ohci_resume(struct device *dev)
235{
236 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
237 struct usb_hcd *hcd = exynos_ohci->hcd;
238 struct platform_device *pdev = to_platform_device(dev);
239 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
240
241 if (pdata && pdata->phy_init)
242 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
243
244 /* Mark hardware accessible again as we are out of D3 state by now */
245 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
246
247 ohci_finish_controller_resume(hcd);
248
249 return 0;
250}
251#else
252#define exynos_ohci_suspend NULL
253#define exynos_ohci_resume NULL
254#endif
255
256static const struct dev_pm_ops exynos_ohci_pm_ops = {
257 .suspend = exynos_ohci_suspend,
258 .resume = exynos_ohci_resume,
259};
260
261static struct platform_driver exynos_ohci_driver = {
262 .probe = exynos_ohci_probe,
263 .remove = __devexit_p(exynos_ohci_remove),
264 .shutdown = exynos_ohci_shutdown,
265 .driver = {
266 .name = "exynos-ohci",
267 .owner = THIS_MODULE,
268 .pm = &exynos_ohci_pm_ops,
269 }
270};
271
272MODULE_ALIAS("platform:exynos-ohci");
273MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");