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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 int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
46{
47 int retval;
48
49 retval = clk_prepare_enable(ehci_mv->clk);
50 if (retval)
51 return retval;
52
53 retval = phy_init(ehci_mv->phy);
54 if (retval)
55 clk_disable_unprepare(ehci_mv->clk);
56
57 return retval;
58}
59
60static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
61{
62 phy_exit(ehci_mv->phy);
63 clk_disable_unprepare(ehci_mv->clk);
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 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
71 u32 status;
72 int retval;
73
74 if (ehci_mv == NULL) {
75 dev_err(dev, "Can not find private ehci data\n");
76 return -ENODEV;
77 }
78
79 hcd->has_tt = 1;
80
81 retval = ehci_setup(hcd);
82 if (retval)
83 dev_err(dev, "ehci_setup failed %d\n", retval);
84
85 if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) {
86 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
87 status |= PORT_TEST_FORCE;
88 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
89 status &= ~PORT_TEST_FORCE;
90 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
91 }
92
93 return retval;
94}
95
96static struct hc_driver __read_mostly ehci_platform_hc_driver;
97
98static const struct ehci_driver_overrides platform_overrides __initconst = {
99 .reset = mv_ehci_reset,
100 .extra_priv_size = sizeof(struct ehci_hcd_mv),
101};
102
103static int mv_ehci_probe(struct platform_device *pdev)
104{
105 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
106 struct usb_hcd *hcd;
107 struct ehci_hcd *ehci;
108 struct ehci_hcd_mv *ehci_mv;
109 struct resource *r;
110 int retval;
111 u32 offset;
112 u32 status;
113
114 if (usb_disabled())
115 return -ENODEV;
116
117 hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, dev_name(&pdev->dev));
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 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
146 ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
147 if (IS_ERR(ehci_mv->base)) {
148 retval = PTR_ERR(ehci_mv->base);
149 goto err_put_hcd;
150 }
151
152 retval = mv_ehci_enable(ehci_mv);
153 if (retval) {
154 dev_err(&pdev->dev, "init phy error %d\n", retval);
155 goto err_put_hcd;
156 }
157
158 ehci_mv->cap_regs =
159 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
160 offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
161 ehci_mv->op_regs =
162 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
163
164 hcd->rsrc_start = r->start;
165 hcd->rsrc_len = resource_size(r);
166 hcd->regs = ehci_mv->op_regs;
167
168 retval = platform_get_irq(pdev, 0);
169 if (retval < 0)
170 goto err_disable_clk;
171 hcd->irq = retval;
172
173 ehci = hcd_to_ehci(hcd);
174 ehci->caps = (struct ehci_caps __iomem *) ehci_mv->cap_regs;
175
176 if (ehci_mv->mode == MV_USB_MODE_OTG) {
177 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
178 if (IS_ERR(ehci_mv->otg)) {
179 retval = PTR_ERR(ehci_mv->otg);
180
181 if (retval == -ENXIO)
182 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
183 "must have CONFIG_USB_PHY enabled\n");
184 else
185 dev_err(&pdev->dev,
186 "unable to find transceiver\n");
187 goto err_disable_clk;
188 }
189
190 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
191 if (retval < 0) {
192 dev_err(&pdev->dev,
193 "unable to register with transceiver\n");
194 retval = -ENODEV;
195 goto err_disable_clk;
196 }
197
198 mv_ehci_disable(ehci_mv);
199 } else {
200 if (ehci_mv->set_vbus)
201 ehci_mv->set_vbus(1);
202
203 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
204 if (retval) {
205 dev_err(&pdev->dev,
206 "failed to add hcd with err %d\n", retval);
207 goto err_set_vbus;
208 }
209 device_wakeup_enable(hcd->self.controller);
210 }
211
212 if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC) {
213 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
214
215 status |= BIT(25);
216 status &= ~GENMASK(31, 30);
217 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
218 }
219
220 dev_info(&pdev->dev,
221 "successful find EHCI device with regs 0x%p irq %d"
222 " working in %s mode\n", hcd->regs, hcd->irq,
223 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
224
225 return 0;
226
227err_set_vbus:
228 if (ehci_mv->set_vbus)
229 ehci_mv->set_vbus(0);
230err_disable_clk:
231 mv_ehci_disable(ehci_mv);
232err_put_hcd:
233 usb_put_hcd(hcd);
234
235 return retval;
236}
237
238static int mv_ehci_remove(struct platform_device *pdev)
239{
240 struct usb_hcd *hcd = platform_get_drvdata(pdev);
241 struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
242
243 if (hcd->rh_registered)
244 usb_remove_hcd(hcd);
245
246 if (!IS_ERR_OR_NULL(ehci_mv->otg))
247 otg_set_host(ehci_mv->otg->otg, NULL);
248
249 if (ehci_mv->mode == MV_USB_MODE_HOST) {
250 if (ehci_mv->set_vbus)
251 ehci_mv->set_vbus(0);
252
253 mv_ehci_disable(ehci_mv);
254 }
255
256 usb_put_hcd(hcd);
257
258 return 0;
259}
260
261MODULE_ALIAS("mv-ehci");
262
263static const struct platform_device_id ehci_id_table[] = {
264 {"pxa-u2oehci", 0},
265 {"pxa-sph", 0},
266 {},
267};
268
269static void mv_ehci_shutdown(struct platform_device *pdev)
270{
271 struct usb_hcd *hcd = platform_get_drvdata(pdev);
272
273 if (!hcd->rh_registered)
274 return;
275
276 if (hcd->driver->shutdown)
277 hcd->driver->shutdown(hcd);
278}
279
280static const struct of_device_id ehci_mv_dt_ids[] = {
281 { .compatible = "marvell,pxau2o-ehci", },
282 {},
283};
284
285static struct platform_driver ehci_mv_driver = {
286 .probe = mv_ehci_probe,
287 .remove = mv_ehci_remove,
288 .shutdown = mv_ehci_shutdown,
289 .driver = {
290 .name = "mv-ehci",
291 .bus = &platform_bus_type,
292 .of_match_table = ehci_mv_dt_ids,
293 },
294 .id_table = ehci_id_table,
295};
296
297static int __init ehci_platform_init(void)
298{
299 if (usb_disabled())
300 return -ENODEV;
301
302 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
303 return platform_driver_register(&ehci_mv_driver);
304}
305module_init(ehci_platform_init);
306
307static void __exit ehci_platform_cleanup(void)
308{
309 platform_driver_unregister(&ehci_mv_driver);
310}
311module_exit(ehci_platform_cleanup);
312
313MODULE_DESCRIPTION("Marvell EHCI driver");
314MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
315MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
316MODULE_ALIAS("mv-ehci");
317MODULE_LICENSE("GPL");
318MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);
319
