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15#include <linux/clk.h>
16#include <linux/dma-mapping.h>
17#include <linux/io.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_gpio.h>
22#include <linux/platform_device.h>
23#include <linux/platform_data/usb-ehci-s5p.h>
24#include <linux/usb/phy.h>
25#include <linux/usb/samsung_usb_phy.h>
26#include <linux/usb.h>
27#include <linux/usb/hcd.h>
28#include <linux/usb/otg.h>
29
30#include "ehci.h"
31
32#define DRIVER_DESC "EHCI s5p driver"
33
34#define EHCI_INSNREG00(base) (base + 0x90)
35#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
36#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
37#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
38#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
39#define EHCI_INSNREG00_ENABLE_DMA_BURST \
40 (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
41 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
42
43static const char hcd_name[] = "ehci-s5p";
44static struct hc_driver __read_mostly s5p_ehci_hc_driver;
45
46struct s5p_ehci_hcd {
47 struct clk *clk;
48 struct usb_phy *phy;
49 struct usb_otg *otg;
50 struct s5p_ehci_platdata *pdata;
51};
52
53#define to_s5p_ehci(hcd) (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
54
55static void s5p_setup_vbus_gpio(struct platform_device *pdev)
56{
57 struct device *dev = &pdev->dev;
58 int err;
59 int gpio;
60
61 if (!dev->of_node)
62 return;
63
64 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
65 if (!gpio_is_valid(gpio))
66 return;
67
68 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
69 "ehci_vbus_gpio");
70 if (err)
71 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
72}
73
74static int s5p_ehci_probe(struct platform_device *pdev)
75{
76 struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
77 struct s5p_ehci_hcd *s5p_ehci;
78 struct usb_hcd *hcd;
79 struct ehci_hcd *ehci;
80 struct resource *res;
81 struct usb_phy *phy;
82 int irq;
83 int err;
84
85
86
87
88
89
90 if (!pdev->dev.dma_mask)
91 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
92 if (!pdev->dev.coherent_dma_mask)
93 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
94
95 s5p_setup_vbus_gpio(pdev);
96
97 hcd = usb_create_hcd(&s5p_ehci_hc_driver,
98 &pdev->dev, dev_name(&pdev->dev));
99 if (!hcd) {
100 dev_err(&pdev->dev, "Unable to create HCD\n");
101 return -ENOMEM;
102 }
103 s5p_ehci = to_s5p_ehci(hcd);
104 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
105 if (IS_ERR(phy)) {
106
107 if (!pdata) {
108 usb_put_hcd(hcd);
109 dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
110 return -EPROBE_DEFER;
111 } else {
112 s5p_ehci->pdata = pdata;
113 }
114 } else {
115 s5p_ehci->phy = phy;
116 s5p_ehci->otg = phy->otg;
117 }
118
119 s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
120
121 if (IS_ERR(s5p_ehci->clk)) {
122 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
123 err = PTR_ERR(s5p_ehci->clk);
124 goto fail_clk;
125 }
126
127 err = clk_prepare_enable(s5p_ehci->clk);
128 if (err)
129 goto fail_clk;
130
131 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132 if (!res) {
133 dev_err(&pdev->dev, "Failed to get I/O memory\n");
134 err = -ENXIO;
135 goto fail_io;
136 }
137
138 hcd->rsrc_start = res->start;
139 hcd->rsrc_len = resource_size(res);
140 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
141 if (!hcd->regs) {
142 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
143 err = -ENOMEM;
144 goto fail_io;
145 }
146
147 irq = platform_get_irq(pdev, 0);
148 if (!irq) {
149 dev_err(&pdev->dev, "Failed to get IRQ\n");
150 err = -ENODEV;
151 goto fail_io;
152 }
153
154 if (s5p_ehci->otg)
155 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
156
157 if (s5p_ehci->phy)
158 usb_phy_init(s5p_ehci->phy);
159 else if (s5p_ehci->pdata->phy_init)
160 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
161
162 ehci = hcd_to_ehci(hcd);
163 ehci->caps = hcd->regs;
164
165
166 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
167
168 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
169 if (err) {
170 dev_err(&pdev->dev, "Failed to add USB HCD\n");
171 goto fail_add_hcd;
172 }
173
174 platform_set_drvdata(pdev, hcd);
175
176 return 0;
177
178fail_add_hcd:
179 if (s5p_ehci->phy)
180 usb_phy_shutdown(s5p_ehci->phy);
181 else if (s5p_ehci->pdata->phy_exit)
182 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
183fail_io:
184 clk_disable_unprepare(s5p_ehci->clk);
185fail_clk:
186 usb_put_hcd(hcd);
187 return err;
188}
189
190static int s5p_ehci_remove(struct platform_device *pdev)
191{
192 struct usb_hcd *hcd = platform_get_drvdata(pdev);
193 struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
194
195 usb_remove_hcd(hcd);
196
197 if (s5p_ehci->otg)
198 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
199
200 if (s5p_ehci->phy)
201 usb_phy_shutdown(s5p_ehci->phy);
202 else if (s5p_ehci->pdata->phy_exit)
203 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
204
205 clk_disable_unprepare(s5p_ehci->clk);
206
207 usb_put_hcd(hcd);
208
209 return 0;
210}
211
212static void s5p_ehci_shutdown(struct platform_device *pdev)
213{
214 struct usb_hcd *hcd = platform_get_drvdata(pdev);
215
216 if (hcd->driver->shutdown)
217 hcd->driver->shutdown(hcd);
218}
219
220#ifdef CONFIG_PM
221static int s5p_ehci_suspend(struct device *dev)
222{
223 struct usb_hcd *hcd = dev_get_drvdata(dev);
224 struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
225 struct platform_device *pdev = to_platform_device(dev);
226
227 bool do_wakeup = device_may_wakeup(dev);
228 int rc;
229
230 rc = ehci_suspend(hcd, do_wakeup);
231
232 if (s5p_ehci->otg)
233 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
234
235 if (s5p_ehci->phy)
236 usb_phy_shutdown(s5p_ehci->phy);
237 else if (s5p_ehci->pdata->phy_exit)
238 s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
239
240 clk_disable_unprepare(s5p_ehci->clk);
241
242 return rc;
243}
244
245static int s5p_ehci_resume(struct device *dev)
246{
247 struct usb_hcd *hcd = dev_get_drvdata(dev);
248 struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
249 struct platform_device *pdev = to_platform_device(dev);
250
251 clk_prepare_enable(s5p_ehci->clk);
252
253 if (s5p_ehci->otg)
254 s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
255
256 if (s5p_ehci->phy)
257 usb_phy_init(s5p_ehci->phy);
258 else if (s5p_ehci->pdata->phy_init)
259 s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
260
261
262 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
263
264 ehci_resume(hcd, false);
265 return 0;
266}
267#else
268#define s5p_ehci_suspend NULL
269#define s5p_ehci_resume NULL
270#endif
271
272static const struct dev_pm_ops s5p_ehci_pm_ops = {
273 .suspend = s5p_ehci_suspend,
274 .resume = s5p_ehci_resume,
275};
276
277#ifdef CONFIG_OF
278static const struct of_device_id exynos_ehci_match[] = {
279 { .compatible = "samsung,exynos4210-ehci" },
280 {},
281};
282MODULE_DEVICE_TABLE(of, exynos_ehci_match);
283#endif
284
285static struct platform_driver s5p_ehci_driver = {
286 .probe = s5p_ehci_probe,
287 .remove = s5p_ehci_remove,
288 .shutdown = s5p_ehci_shutdown,
289 .driver = {
290 .name = "s5p-ehci",
291 .owner = THIS_MODULE,
292 .pm = &s5p_ehci_pm_ops,
293 .of_match_table = of_match_ptr(exynos_ehci_match),
294 }
295};
296static const struct ehci_driver_overrides s5p_overrides __initdata = {
297 .extra_priv_size = sizeof(struct s5p_ehci_hcd),
298};
299
300static int __init ehci_s5p_init(void)
301{
302 if (usb_disabled())
303 return -ENODEV;
304
305 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
306 ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides);
307 return platform_driver_register(&s5p_ehci_driver);
308}
309module_init(ehci_s5p_init);
310
311static void __exit ehci_s5p_cleanup(void)
312{
313 platform_driver_unregister(&s5p_ehci_driver);
314}
315module_exit(ehci_s5p_cleanup);
316
317MODULE_DESCRIPTION(DRIVER_DESC);
318MODULE_ALIAS("platform:s5p-ehci");
319MODULE_AUTHOR("Jingoo Han");
320MODULE_AUTHOR("Joonyoung Shim");
321MODULE_LICENSE("GPL v2");
322
