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1/*
2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
3 * Author: Chao Xie <chao.xie@marvell.com>
4 * Neil Zhang <zhangwm@marvell.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/usb/otg.h>
18#include <linux/platform_data/mv_usb.h>
19
20#define CAPLENGTH_MASK (0xff)
21
22struct ehci_hcd_mv {
23 struct usb_hcd *hcd;
24
25 /* Which mode does this ehci running OTG/Host ? */
26 int mode;
27
28 void __iomem *phy_regs;
29 void __iomem *cap_regs;
30 void __iomem *op_regs;
31
32 struct usb_phy *otg;
33
34 struct mv_usb_platform_data *pdata;
35
36 struct clk *clk;
37};
38
39static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
40{
41 clk_prepare_enable(ehci_mv->clk);
42}
43
44static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
45{
46 clk_disable_unprepare(ehci_mv->clk);
47}
48
49static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
50{
51 int retval;
52
53 ehci_clock_enable(ehci_mv);
54 if (ehci_mv->pdata->phy_init) {
55 retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs);
56 if (retval)
57 return retval;
58 }
59
60 return 0;
61}
62
63static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
64{
65 if (ehci_mv->pdata->phy_deinit)
66 ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs);
67 ehci_clock_disable(ehci_mv);
68}
69
70static int mv_ehci_reset(struct usb_hcd *hcd)
71{
72 struct device *dev = hcd->self.controller;
73 struct ehci_hcd_mv *ehci_mv = dev_get_drvdata(dev);
74 int retval;
75
76 if (ehci_mv == NULL) {
77 dev_err(dev, "Can not find private ehci data\n");
78 return -ENODEV;
79 }
80
81 hcd->has_tt = 1;
82
83 retval = ehci_setup(hcd);
84 if (retval)
85 dev_err(dev, "ehci_setup failed %d\n", retval);
86
87 return retval;
88}
89
90static const struct hc_driver mv_ehci_hc_driver = {
91 .description = hcd_name,
92 .product_desc = "Marvell EHCI",
93 .hcd_priv_size = sizeof(struct ehci_hcd),
94
95 /*
96 * generic hardware linkage
97 */
98 .irq = ehci_irq,
99 .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
100
101 /*
102 * basic lifecycle operations
103 */
104 .reset = mv_ehci_reset,
105 .start = ehci_run,
106 .stop = ehci_stop,
107 .shutdown = ehci_shutdown,
108
109 /*
110 * managing i/o requests and associated device resources
111 */
112 .urb_enqueue = ehci_urb_enqueue,
113 .urb_dequeue = ehci_urb_dequeue,
114 .endpoint_disable = ehci_endpoint_disable,
115 .endpoint_reset = ehci_endpoint_reset,
116 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
117
118 /*
119 * scheduling support
120 */
121 .get_frame_number = ehci_get_frame,
122
123 /*
124 * root hub support
125 */
126 .hub_status_data = ehci_hub_status_data,
127 .hub_control = ehci_hub_control,
128 .bus_suspend = ehci_bus_suspend,
129 .bus_resume = ehci_bus_resume,
130};
131
132static int mv_ehci_probe(struct platform_device *pdev)
133{
134 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
135 struct usb_hcd *hcd;
136 struct ehci_hcd *ehci;
137 struct ehci_hcd_mv *ehci_mv;
138 struct resource *r;
139 int retval = -ENODEV;
140 u32 offset;
141
142 if (!pdata) {
143 dev_err(&pdev->dev, "missing platform_data\n");
144 return -ENODEV;
145 }
146
147 if (usb_disabled())
148 return -ENODEV;
149
150 hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci");
151 if (!hcd)
152 return -ENOMEM;
153
154 ehci_mv = devm_kzalloc(&pdev->dev, sizeof(*ehci_mv), GFP_KERNEL);
155 if (ehci_mv == NULL) {
156 retval = -ENOMEM;
157 goto err_put_hcd;
158 }
159
160 platform_set_drvdata(pdev, ehci_mv);
161 ehci_mv->pdata = pdata;
162 ehci_mv->hcd = hcd;
163
164 ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
165 if (IS_ERR(ehci_mv->clk)) {
166 dev_err(&pdev->dev, "error getting clock\n");
167 retval = PTR_ERR(ehci_mv->clk);
168 goto err_put_hcd;
169 }
170
171 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs");
172 ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
173 if (IS_ERR(ehci_mv->phy_regs)) {
174 retval = PTR_ERR(ehci_mv->phy_regs);
175 goto err_put_hcd;
176 }
177
178 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
179 ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
180 if (IS_ERR(ehci_mv->cap_regs)) {
181 retval = PTR_ERR(ehci_mv->cap_regs);
182 goto err_put_hcd;
183 }
184
185 retval = mv_ehci_enable(ehci_mv);
186 if (retval) {
187 dev_err(&pdev->dev, "init phy error %d\n", retval);
188 goto err_put_hcd;
189 }
190
191 offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
192 ehci_mv->op_regs =
193 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
194
195 hcd->rsrc_start = r->start;
196 hcd->rsrc_len = resource_size(r);
197 hcd->regs = ehci_mv->op_regs;
198
199 hcd->irq = platform_get_irq(pdev, 0);
200 if (!hcd->irq) {
201 dev_err(&pdev->dev, "Cannot get irq.");
202 retval = -ENODEV;
203 goto err_disable_clk;
204 }
205
206 ehci = hcd_to_ehci(hcd);
207 ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
208
209 ehci_mv->mode = pdata->mode;
210 if (ehci_mv->mode == MV_USB_MODE_OTG) {
211 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
212 if (IS_ERR(ehci_mv->otg)) {
213 retval = PTR_ERR(ehci_mv->otg);
214
215 if (retval == -ENXIO)
216 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
217 "must have CONFIG_USB_PHY enabled\n");
218 else
219 dev_err(&pdev->dev,
220 "unable to find transceiver\n");
221 goto err_disable_clk;
222 }
223
224 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
225 if (retval < 0) {
226 dev_err(&pdev->dev,
227 "unable to register with transceiver\n");
228 retval = -ENODEV;
229 goto err_disable_clk;
230 }
231 /* otg will enable clock before use as host */
232 mv_ehci_disable(ehci_mv);
233 } else {
234 if (pdata->set_vbus)
235 pdata->set_vbus(1);
236
237 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
238 if (retval) {
239 dev_err(&pdev->dev,
240 "failed to add hcd with err %d\n", retval);
241 goto err_set_vbus;
242 }
243 device_wakeup_enable(hcd->self.controller);
244 }
245
246 if (pdata->private_init)
247 pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);
248
249 dev_info(&pdev->dev,
250 "successful find EHCI device with regs 0x%p irq %d"
251 " working in %s mode\n", hcd->regs, hcd->irq,
252 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
253
254 return 0;
255
256err_set_vbus:
257 if (pdata->set_vbus)
258 pdata->set_vbus(0);
259err_disable_clk:
260 mv_ehci_disable(ehci_mv);
261err_put_hcd:
262 usb_put_hcd(hcd);
263
264 return retval;
265}
266
267static int mv_ehci_remove(struct platform_device *pdev)
268{
269 struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
270 struct usb_hcd *hcd = ehci_mv->hcd;
271
272 if (hcd->rh_registered)
273 usb_remove_hcd(hcd);
274
275 if (!IS_ERR_OR_NULL(ehci_mv->otg))
276 otg_set_host(ehci_mv->otg->otg, NULL);
277
278 if (ehci_mv->mode == MV_USB_MODE_HOST) {
279 if (ehci_mv->pdata->set_vbus)
280 ehci_mv->pdata->set_vbus(0);
281
282 mv_ehci_disable(ehci_mv);
283 }
284
285 usb_put_hcd(hcd);
286
287 return 0;
288}
289
290MODULE_ALIAS("mv-ehci");
291
292static const struct platform_device_id ehci_id_table[] = {
293 {"pxa-u2oehci", PXA_U2OEHCI},
294 {"pxa-sph", PXA_SPH},
295 {"mmp3-hsic", MMP3_HSIC},
296 {"mmp3-fsic", MMP3_FSIC},
297 {},
298};
299
300static void mv_ehci_shutdown(struct platform_device *pdev)
301{
302 struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
303 struct usb_hcd *hcd = ehci_mv->hcd;
304
305 if (!hcd->rh_registered)
306 return;
307
308 if (hcd->driver->shutdown)
309 hcd->driver->shutdown(hcd);
310}
311
312static struct platform_driver ehci_mv_driver = {
313 .probe = mv_ehci_probe,
314 .remove = mv_ehci_remove,
315 .shutdown = mv_ehci_shutdown,
316 .driver = {
317 .name = "mv-ehci",
318 .bus = &platform_bus_type,
319 },
320 .id_table = ehci_id_table,
321};