1 /*
2 * Copyright (C) 2010 ST-Ericsson AB
3 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
4 *
5 * Based on omap2430.c
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/clk.h>
26 #include <linux/err.h>
27 #include <linux/io.h>
28 #include <linux/platform_device.h>
29 #include <linux/usb/musb-ux500.h>
30
31 #include "musb_core.h"
32
33 struct ux500_glue {
34 struct device *dev;
35 struct platform_device *musb;
36 struct clk *clk;
37 };
38 #define glue_to_musb(g) platform_get_drvdata(g->musb)
39
ux500_musb_set_vbus(struct musb * musb,int is_on)40 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
41 {
42 u8 devctl;
43 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
44 /* HDRC controls CPEN, but beware current surges during device
45 * connect. They can trigger transient overcurrent conditions
46 * that must be ignored.
47 */
48
49 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
50
51 if (is_on) {
52 if (musb->xceiv->state == OTG_STATE_A_IDLE) {
53 /* start the session */
54 devctl |= MUSB_DEVCTL_SESSION;
55 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
56 /*
57 * Wait for the musb to set as A device to enable the
58 * VBUS
59 */
60 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
61
62 if (time_after(jiffies, timeout)) {
63 dev_err(musb->controller,
64 "configured as A device timeout");
65 break;
66 }
67 }
68
69 } else {
70 musb->is_active = 1;
71 musb->xceiv->otg->default_a = 1;
72 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
73 devctl |= MUSB_DEVCTL_SESSION;
74 MUSB_HST_MODE(musb);
75 }
76 } else {
77 musb->is_active = 0;
78
79 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
80 * right to B_IDLE...
81 */
82 musb->xceiv->otg->default_a = 0;
83 devctl &= ~MUSB_DEVCTL_SESSION;
84 MUSB_DEV_MODE(musb);
85 }
86 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
87
88 /*
89 * Devctl values will be updated after vbus goes below
90 * session_valid. The time taken depends on the capacitance
91 * on VBUS line. The max discharge time can be upto 1 sec
92 * as per the spec. Typically on our platform, it is 200ms
93 */
94 if (!is_on)
95 mdelay(200);
96
97 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
98 usb_otg_state_string(musb->xceiv->state),
99 musb_readb(musb->mregs, MUSB_DEVCTL));
100 }
101
musb_otg_notifications(struct notifier_block * nb,unsigned long event,void * unused)102 static int musb_otg_notifications(struct notifier_block *nb,
103 unsigned long event, void *unused)
104 {
105 struct musb *musb = container_of(nb, struct musb, nb);
106
107 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
108 event, usb_otg_state_string(musb->xceiv->state));
109
110 switch (event) {
111 case UX500_MUSB_ID:
112 dev_dbg(musb->controller, "ID GND\n");
113 ux500_musb_set_vbus(musb, 1);
114 break;
115 case UX500_MUSB_VBUS:
116 dev_dbg(musb->controller, "VBUS Connect\n");
117 break;
118 case UX500_MUSB_NONE:
119 dev_dbg(musb->controller, "VBUS Disconnect\n");
120 if (is_host_active(musb))
121 ux500_musb_set_vbus(musb, 0);
122 else
123 musb->xceiv->state = OTG_STATE_B_IDLE;
124 break;
125 default:
126 dev_dbg(musb->controller, "ID float\n");
127 return NOTIFY_DONE;
128 }
129 return NOTIFY_OK;
130 }
131
ux500_musb_interrupt(int irq,void * __hci)132 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
133 {
134 unsigned long flags;
135 irqreturn_t retval = IRQ_NONE;
136 struct musb *musb = __hci;
137
138 spin_lock_irqsave(&musb->lock, flags);
139
140 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
141 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
142 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
143
144 if (musb->int_usb || musb->int_tx || musb->int_rx)
145 retval = musb_interrupt(musb);
146
147 spin_unlock_irqrestore(&musb->lock, flags);
148
149 return retval;
150 }
151
ux500_musb_init(struct musb * musb)152 static int ux500_musb_init(struct musb *musb)
153 {
154 int status;
155
156 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
157 if (IS_ERR_OR_NULL(musb->xceiv)) {
158 pr_err("HS USB OTG: no transceiver configured\n");
159 return -EPROBE_DEFER;
160 }
161
162 musb->nb.notifier_call = musb_otg_notifications;
163 status = usb_register_notifier(musb->xceiv, &musb->nb);
164 if (status < 0) {
165 dev_dbg(musb->controller, "notification register failed\n");
166 return status;
167 }
168
169 musb->isr = ux500_musb_interrupt;
170
171 return 0;
172 }
173
ux500_musb_exit(struct musb * musb)174 static int ux500_musb_exit(struct musb *musb)
175 {
176 usb_unregister_notifier(musb->xceiv, &musb->nb);
177
178 usb_put_phy(musb->xceiv);
179
180 return 0;
181 }
182
183 static const struct musb_platform_ops ux500_ops = {
184 .init = ux500_musb_init,
185 .exit = ux500_musb_exit,
186
187 .set_vbus = ux500_musb_set_vbus,
188 };
189
ux500_probe(struct platform_device * pdev)190 static int ux500_probe(struct platform_device *pdev)
191 {
192 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
193 struct platform_device *musb;
194 struct ux500_glue *glue;
195 struct clk *clk;
196 int ret = -ENOMEM;
197
198 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
199 if (!glue) {
200 dev_err(&pdev->dev, "failed to allocate glue context\n");
201 goto err0;
202 }
203
204 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
205 if (!musb) {
206 dev_err(&pdev->dev, "failed to allocate musb device\n");
207 goto err1;
208 }
209
210 clk = clk_get(&pdev->dev, "usb");
211 if (IS_ERR(clk)) {
212 dev_err(&pdev->dev, "failed to get clock\n");
213 ret = PTR_ERR(clk);
214 goto err3;
215 }
216
217 ret = clk_prepare_enable(clk);
218 if (ret) {
219 dev_err(&pdev->dev, "failed to enable clock\n");
220 goto err4;
221 }
222
223 musb->dev.parent = &pdev->dev;
224 musb->dev.dma_mask = pdev->dev.dma_mask;
225 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
226
227 glue->dev = &pdev->dev;
228 glue->musb = musb;
229 glue->clk = clk;
230
231 pdata->platform_ops = &ux500_ops;
232
233 platform_set_drvdata(pdev, glue);
234
235 ret = platform_device_add_resources(musb, pdev->resource,
236 pdev->num_resources);
237 if (ret) {
238 dev_err(&pdev->dev, "failed to add resources\n");
239 goto err5;
240 }
241
242 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
243 if (ret) {
244 dev_err(&pdev->dev, "failed to add platform_data\n");
245 goto err5;
246 }
247
248 ret = platform_device_add(musb);
249 if (ret) {
250 dev_err(&pdev->dev, "failed to register musb device\n");
251 goto err5;
252 }
253
254 return 0;
255
256 err5:
257 clk_disable_unprepare(clk);
258
259 err4:
260 clk_put(clk);
261
262 err3:
263 platform_device_put(musb);
264
265 err1:
266 kfree(glue);
267
268 err0:
269 return ret;
270 }
271
ux500_remove(struct platform_device * pdev)272 static int ux500_remove(struct platform_device *pdev)
273 {
274 struct ux500_glue *glue = platform_get_drvdata(pdev);
275
276 platform_device_unregister(glue->musb);
277 clk_disable_unprepare(glue->clk);
278 clk_put(glue->clk);
279 kfree(glue);
280
281 return 0;
282 }
283
284 #ifdef CONFIG_PM
ux500_suspend(struct device * dev)285 static int ux500_suspend(struct device *dev)
286 {
287 struct ux500_glue *glue = dev_get_drvdata(dev);
288 struct musb *musb = glue_to_musb(glue);
289
290 usb_phy_set_suspend(musb->xceiv, 1);
291 clk_disable_unprepare(glue->clk);
292
293 return 0;
294 }
295
ux500_resume(struct device * dev)296 static int ux500_resume(struct device *dev)
297 {
298 struct ux500_glue *glue = dev_get_drvdata(dev);
299 struct musb *musb = glue_to_musb(glue);
300 int ret;
301
302 ret = clk_prepare_enable(glue->clk);
303 if (ret) {
304 dev_err(dev, "failed to enable clock\n");
305 return ret;
306 }
307
308 usb_phy_set_suspend(musb->xceiv, 0);
309
310 return 0;
311 }
312
313 static const struct dev_pm_ops ux500_pm_ops = {
314 .suspend = ux500_suspend,
315 .resume = ux500_resume,
316 };
317
318 #define DEV_PM_OPS (&ux500_pm_ops)
319 #else
320 #define DEV_PM_OPS NULL
321 #endif
322
323 static struct platform_driver ux500_driver = {
324 .probe = ux500_probe,
325 .remove = ux500_remove,
326 .driver = {
327 .name = "musb-ux500",
328 .pm = DEV_PM_OPS,
329 },
330 };
331
332 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
333 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
334 MODULE_LICENSE("GPL v2");
335 module_platform_driver(ux500_driver);
336