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8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/clk.h>
12#include <linux/err.h>
13#include <linux/usb/otg.h>
14#include <linux/platform_data/mv_usb.h>
15#include <linux/io.h>
16
17#include <linux/usb/hcd.h>
18
19#include "ehci.h"
20
21
22#define U2x_CAPREGS_OFFSET 0x100
23
24#define CAPLENGTH_MASK (0xff)
25
26#define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
27
28struct ehci_hcd_mv {
29
30 int mode;
31
32 void __iomem *base;
33 void __iomem *cap_regs;
34 void __iomem *op_regs;
35
36 struct usb_phy *otg;
37 struct clk *clk;
38
39 struct phy *phy;
40
41 int (*set_vbus)(unsigned int vbus);
42};
43
44static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
45{
46 clk_prepare_enable(ehci_mv->clk);
47}
48
49static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
50{
51 clk_disable_unprepare(ehci_mv->clk);
52}
53
54static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
55{
56 ehci_clock_enable(ehci_mv);
57 return phy_init(ehci_mv->phy);
58}
59
60static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
61{
62 phy_exit(ehci_mv->phy);
63 ehci_clock_disable(ehci_mv);
64}
65
66static int mv_ehci_reset(struct usb_hcd *hcd)
67{
68 struct device *dev = hcd->self.controller;
69 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
70 int retval;
71
72 if (ehci_mv == NULL) {
73 dev_err(dev, "Can not find private ehci data\n");
74 return -ENODEV;
75 }
76
77 hcd->has_tt = 1;
78
79 retval = ehci_setup(hcd);
80 if (retval)
81 dev_err(dev, "ehci_setup failed %d\n", retval);
82
83 return retval;
84}
85
86static struct hc_driver __read_mostly ehci_platform_hc_driver;
87
88static const struct ehci_driver_overrides platform_overrides __initconst = {
89 .reset = mv_ehci_reset,
90 .extra_priv_size = sizeof(struct ehci_hcd_mv),
91};
92
93static int mv_ehci_probe(struct platform_device *pdev)
94{
95 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
96 struct usb_hcd *hcd;
97 struct ehci_hcd *ehci;
98 struct ehci_hcd_mv *ehci_mv;
99 struct resource *r;
100 int retval = -ENODEV;
101 u32 offset;
102
103 if (usb_disabled())
104 return -ENODEV;
105
106 hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
107 if (!hcd)
108 return -ENOMEM;
109
110 platform_set_drvdata(pdev, hcd);
111 ehci_mv = hcd_to_ehci_hcd_mv(hcd);
112
113 ehci_mv->mode = MV_USB_MODE_HOST;
114 if (pdata) {
115 ehci_mv->mode = pdata->mode;
116 ehci_mv->set_vbus = pdata->set_vbus;
117 }
118
119 ehci_mv->phy = devm_phy_get(&pdev->dev, "usb");
120 if (IS_ERR(ehci_mv->phy)) {
121 retval = PTR_ERR(ehci_mv->phy);
122 if (retval != -EPROBE_DEFER)
123 dev_err(&pdev->dev, "Failed to get phy.\n");
124 goto err_put_hcd;
125 }
126
127 ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
128 if (IS_ERR(ehci_mv->clk)) {
129 dev_err(&pdev->dev, "error getting clock\n");
130 retval = PTR_ERR(ehci_mv->clk);
131 goto err_put_hcd;
132 }
133
134
135
136 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
137 ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
138 if (IS_ERR(ehci_mv->base)) {
139 retval = PTR_ERR(ehci_mv->base);
140 goto err_put_hcd;
141 }
142
143 retval = mv_ehci_enable(ehci_mv);
144 if (retval) {
145 dev_err(&pdev->dev, "init phy error %d\n", retval);
146 goto err_put_hcd;
147 }
148
149 ehci_mv->cap_regs =
150 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
151 offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
152 ehci_mv->op_regs =
153 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
154
155 hcd->rsrc_start = r->start;
156 hcd->rsrc_len = resource_size(r);
157 hcd->regs = ehci_mv->op_regs;
158
159 hcd->irq = platform_get_irq(pdev, 0);
160 if (!hcd->irq) {
161 dev_err(&pdev->dev, "Cannot get irq.");
162 retval = -ENODEV;
163 goto err_disable_clk;
164 }
165
166 ehci = hcd_to_ehci(hcd);
167 ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
168
169 if (ehci_mv->mode == MV_USB_MODE_OTG) {
170 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
171 if (IS_ERR(ehci_mv->otg)) {
172 retval = PTR_ERR(ehci_mv->otg);
173
174 if (retval == -ENXIO)
175 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
176 "must have CONFIG_USB_PHY enabled\n");
177 else
178 dev_err(&pdev->dev,
179 "unable to find transceiver\n");
180 goto err_disable_clk;
181 }
182
183 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
184 if (retval < 0) {
185 dev_err(&pdev->dev,
186 "unable to register with transceiver\n");
187 retval = -ENODEV;
188 goto err_disable_clk;
189 }
190
191 mv_ehci_disable(ehci_mv);
192 } else {
193 if (ehci_mv->set_vbus)
194 ehci_mv->set_vbus(1);
195
196 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
197 if (retval) {
198 dev_err(&pdev->dev,
199 "failed to add hcd with err %d\n", retval);
200 goto err_set_vbus;
201 }
202 device_wakeup_enable(hcd->self.controller);
203 }
204
205 dev_info(&pdev->dev,
206 "successful find EHCI device with regs 0x%p irq %d"
207 " working in %s mode\n", hcd->regs, hcd->irq,
208 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
209
210 return 0;
211
212err_set_vbus:
213 if (ehci_mv->set_vbus)
214 ehci_mv->set_vbus(0);
215err_disable_clk:
216 mv_ehci_disable(ehci_mv);
217err_put_hcd:
218 usb_put_hcd(hcd);
219
220 return retval;
221}
222
223static int mv_ehci_remove(struct platform_device *pdev)
224{
225 struct usb_hcd *hcd = platform_get_drvdata(pdev);
226 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
227
228 if (hcd->rh_registered)
229 usb_remove_hcd(hcd);
230
231 if (!IS_ERR_OR_NULL(ehci_mv->otg))
232 otg_set_host(ehci_mv->otg->otg, NULL);
233
234 if (ehci_mv->mode == MV_USB_MODE_HOST) {
235 if (ehci_mv->set_vbus)
236 ehci_mv->set_vbus(0);
237
238 mv_ehci_disable(ehci_mv);
239 }
240
241 usb_put_hcd(hcd);
242
243 return 0;
244}
245
246MODULE_ALIAS("mv-ehci");
247
248static const struct platform_device_id ehci_id_table[] = {
249 {"pxa-u2oehci", PXA_U2OEHCI},
250 {"pxa-sph", PXA_SPH},
251 {"mmp3-hsic", MMP3_HSIC},
252 {"mmp3-fsic", MMP3_FSIC},
253 {},
254};
255
256static void mv_ehci_shutdown(struct platform_device *pdev)
257{
258 struct usb_hcd *hcd = platform_get_drvdata(pdev);
259
260 if (!hcd->rh_registered)
261 return;
262
263 if (hcd->driver->shutdown)
264 hcd->driver->shutdown(hcd);
265}
266
267static const struct of_device_id ehci_mv_dt_ids[] = {
268 { .compatible = "marvell,pxau2o-ehci", },
269 {},
270};
271
272static struct platform_driver ehci_mv_driver = {
273 .probe = mv_ehci_probe,
274 .remove = mv_ehci_remove,
275 .shutdown = mv_ehci_shutdown,
276 .driver = {
277 .name = "mv-ehci",
278 .bus = &platform_bus_type,
279 .of_match_table = ehci_mv_dt_ids,
280 },
281 .id_table = ehci_id_table,
282};
283
284static int __init ehci_platform_init(void)
285{
286 if (usb_disabled())
287 return -ENODEV;
288
289 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
290 return platform_driver_register(&ehci_mv_driver);
291}
292module_init(ehci_platform_init);
293
294static void __exit ehci_platform_cleanup(void)
295{
296 platform_driver_unregister(&ehci_mv_driver);
297}
298module_exit(ehci_platform_cleanup);
299
300MODULE_DESCRIPTION("Marvell EHCI driver");
301MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
302MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
303MODULE_ALIAS("mv-ehci");
304MODULE_LICENSE("GPL");
305MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);
306
