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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/usb/of.h>
15#include <linux/platform_data/mv_usb.h>
16#include <linux/io.h>
17
18#include <linux/usb/hcd.h>
19
20#include "ehci.h"
21
22
23#define U2x_CAPREGS_OFFSET 0x100
24
25#define CAPLENGTH_MASK (0xff)
26
27#define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
28
29struct ehci_hcd_mv {
30
31 int mode;
32
33 void __iomem *base;
34 void __iomem *cap_regs;
35 void __iomem *op_regs;
36
37 struct usb_phy *otg;
38 struct clk *clk;
39
40 struct phy *phy;
41
42 int (*set_vbus)(unsigned int vbus);
43};
44
45static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
46{
47 clk_prepare_enable(ehci_mv->clk);
48}
49
50static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
51{
52 clk_disable_unprepare(ehci_mv->clk);
53}
54
55static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
56{
57 ehci_clock_enable(ehci_mv);
58 return phy_init(ehci_mv->phy);
59}
60
61static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
62{
63 phy_exit(ehci_mv->phy);
64 ehci_clock_disable(ehci_mv);
65}
66
67static int mv_ehci_reset(struct usb_hcd *hcd)
68{
69 struct device *dev = hcd->self.controller;
70 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
71 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
72 u32 status;
73 int retval;
74
75 if (ehci_mv == NULL) {
76 dev_err(dev, "Can not find private ehci data\n");
77 return -ENODEV;
78 }
79
80 hcd->has_tt = 1;
81
82 retval = ehci_setup(hcd);
83 if (retval)
84 dev_err(dev, "ehci_setup failed %d\n", retval);
85
86 if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) {
87 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
88 status |= PORT_TEST_FORCE;
89 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
90 status &= ~PORT_TEST_FORCE;
91 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
92 }
93
94 return retval;
95}
96
97static struct hc_driver __read_mostly ehci_platform_hc_driver;
98
99static const struct ehci_driver_overrides platform_overrides __initconst = {
100 .reset = mv_ehci_reset,
101 .extra_priv_size = sizeof(struct ehci_hcd_mv),
102};
103
104static int mv_ehci_probe(struct platform_device *pdev)
105{
106 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
107 struct usb_hcd *hcd;
108 struct ehci_hcd *ehci;
109 struct ehci_hcd_mv *ehci_mv;
110 struct resource *r;
111 int retval = -ENODEV;
112 u32 offset;
113
114 if (usb_disabled())
115 return -ENODEV;
116
117 hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
118 if (!hcd)
119 return -ENOMEM;
120
121 platform_set_drvdata(pdev, hcd);
122 ehci_mv = hcd_to_ehci_hcd_mv(hcd);
123
124 ehci_mv->mode = MV_USB_MODE_HOST;
125 if (pdata) {
126 ehci_mv->mode = pdata->mode;
127 ehci_mv->set_vbus = pdata->set_vbus;
128 }
129
130 ehci_mv->phy = devm_phy_optional_get(&pdev->dev, "usb");
131 if (IS_ERR(ehci_mv->phy)) {
132 retval = PTR_ERR(ehci_mv->phy);
133 if (retval != -EPROBE_DEFER)
134 dev_err(&pdev->dev, "Failed to get phy.\n");
135 goto err_put_hcd;
136 }
137
138 ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
139 if (IS_ERR(ehci_mv->clk)) {
140 dev_err(&pdev->dev, "error getting clock\n");
141 retval = PTR_ERR(ehci_mv->clk);
142 goto err_put_hcd;
143 }
144
145
146
147 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148 ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
149 if (IS_ERR(ehci_mv->base)) {
150 retval = PTR_ERR(ehci_mv->base);
151 goto err_put_hcd;
152 }
153
154 retval = mv_ehci_enable(ehci_mv);
155 if (retval) {
156 dev_err(&pdev->dev, "init phy error %d\n", retval);
157 goto err_put_hcd;
158 }
159
160 ehci_mv->cap_regs =
161 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
162 offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
163 ehci_mv->op_regs =
164 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
165
166 hcd->rsrc_start = r->start;
167 hcd->rsrc_len = resource_size(r);
168 hcd->regs = ehci_mv->op_regs;
169
170 hcd->irq = platform_get_irq(pdev, 0);
171 if (!hcd->irq) {
172 dev_err(&pdev->dev, "Cannot get irq.");
173 retval = -ENODEV;
174 goto err_disable_clk;
175 }
176
177 ehci = hcd_to_ehci(hcd);
178 ehci->caps = (struct ehci_caps __iomem *) ehci_mv->cap_regs;
179
180 if (ehci_mv->mode == MV_USB_MODE_OTG) {
181 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
182 if (IS_ERR(ehci_mv->otg)) {
183 retval = PTR_ERR(ehci_mv->otg);
184
185 if (retval == -ENXIO)
186 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
187 "must have CONFIG_USB_PHY enabled\n");
188 else
189 dev_err(&pdev->dev,
190 "unable to find transceiver\n");
191 goto err_disable_clk;
192 }
193
194 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
195 if (retval < 0) {
196 dev_err(&pdev->dev,
197 "unable to register with transceiver\n");
198 retval = -ENODEV;
199 goto err_disable_clk;
200 }
201
202 mv_ehci_disable(ehci_mv);
203 } else {
204 if (ehci_mv->set_vbus)
205 ehci_mv->set_vbus(1);
206
207 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
208 if (retval) {
209 dev_err(&pdev->dev,
210 "failed to add hcd with err %d\n", retval);
211 goto err_set_vbus;
212 }
213 device_wakeup_enable(hcd->self.controller);
214 }
215
216 dev_info(&pdev->dev,
217 "successful find EHCI device with regs 0x%p irq %d"
218 " working in %s mode\n", hcd->regs, hcd->irq,
219 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
220
221 return 0;
222
223err_set_vbus:
224 if (ehci_mv->set_vbus)
225 ehci_mv->set_vbus(0);
226err_disable_clk:
227 mv_ehci_disable(ehci_mv);
228err_put_hcd:
229 usb_put_hcd(hcd);
230
231 return retval;
232}
233
234static int mv_ehci_remove(struct platform_device *pdev)
235{
236 struct usb_hcd *hcd = platform_get_drvdata(pdev);
237 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
238
239 if (hcd->rh_registered)
240 usb_remove_hcd(hcd);
241
242 if (!IS_ERR_OR_NULL(ehci_mv->otg))
243 otg_set_host(ehci_mv->otg->otg, NULL);
244
245 if (ehci_mv->mode == MV_USB_MODE_HOST) {
246 if (ehci_mv->set_vbus)
247 ehci_mv->set_vbus(0);
248
249 mv_ehci_disable(ehci_mv);
250 }
251
252 usb_put_hcd(hcd);
253
254 return 0;
255}
256
257MODULE_ALIAS("mv-ehci");
258
259static const struct platform_device_id ehci_id_table[] = {
260 {"pxa-u2oehci", 0},
261 {"pxa-sph", 0},
262 {},
263};
264
265static void mv_ehci_shutdown(struct platform_device *pdev)
266{
267 struct usb_hcd *hcd = platform_get_drvdata(pdev);
268
269 if (!hcd->rh_registered)
270 return;
271
272 if (hcd->driver->shutdown)
273 hcd->driver->shutdown(hcd);
274}
275
276static const struct of_device_id ehci_mv_dt_ids[] = {
277 { .compatible = "marvell,pxau2o-ehci", },
278 {},
279};
280
281static struct platform_driver ehci_mv_driver = {
282 .probe = mv_ehci_probe,
283 .remove = mv_ehci_remove,
284 .shutdown = mv_ehci_shutdown,
285 .driver = {
286 .name = "mv-ehci",
287 .bus = &platform_bus_type,
288 .of_match_table = ehci_mv_dt_ids,
289 },
290 .id_table = ehci_id_table,
291};
292
293static int __init ehci_platform_init(void)
294{
295 if (usb_disabled())
296 return -ENODEV;
297
298 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
299 return platform_driver_register(&ehci_mv_driver);
300}
301module_init(ehci_platform_init);
302
303static void __exit ehci_platform_cleanup(void)
304{
305 platform_driver_unregister(&ehci_mv_driver);
306}
307module_exit(ehci_platform_cleanup);
308
309MODULE_DESCRIPTION("Marvell EHCI driver");
310MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
311MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
312MODULE_ALIAS("mv-ehci");
313MODULE_LICENSE("GPL");
314MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);
315
