xref: /openbmc/linux/drivers/usb/musb/ux500.c (revision 23c2b932)
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/clk.h>
25 #include <linux/err.h>
26 #include <linux/io.h>
27 #include <linux/of.h>
28 #include <linux/platform_device.h>
29 #include <linux/usb/musb-ux500.h>
30 
31 #include "musb_core.h"
32 
33 static struct musb_hdrc_config ux500_musb_hdrc_config = {
34 	.multipoint	= true,
35 	.dyn_fifo	= true,
36 	.num_eps	= 16,
37 	.ram_bits	= 16,
38 };
39 
40 struct ux500_glue {
41 	struct device		*dev;
42 	struct platform_device	*musb;
43 	struct clk		*clk;
44 };
45 #define glue_to_musb(g)	platform_get_drvdata(g->musb)
46 
47 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
48 {
49 	u8            devctl;
50 	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
51 	/* HDRC controls CPEN, but beware current surges during device
52 	 * connect.  They can trigger transient overcurrent conditions
53 	 * that must be ignored.
54 	 */
55 
56 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
57 
58 	if (is_on) {
59 		if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
60 			/* start the session */
61 			devctl |= MUSB_DEVCTL_SESSION;
62 			musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
63 			/*
64 			 * Wait for the musb to set as A device to enable the
65 			 * VBUS
66 			 */
67 			while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
68 
69 				if (time_after(jiffies, timeout)) {
70 					dev_err(musb->controller,
71 					"configured as A device timeout");
72 					break;
73 				}
74 			}
75 
76 		} else {
77 			musb->is_active = 1;
78 			musb->xceiv->otg->default_a = 1;
79 			musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
80 			devctl |= MUSB_DEVCTL_SESSION;
81 			MUSB_HST_MODE(musb);
82 		}
83 	} else {
84 		musb->is_active = 0;
85 
86 		/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
87 		 * right to B_IDLE...
88 		 */
89 		musb->xceiv->otg->default_a = 0;
90 		devctl &= ~MUSB_DEVCTL_SESSION;
91 		MUSB_DEV_MODE(musb);
92 	}
93 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
94 
95 	/*
96 	 * Devctl values will be updated after vbus goes below
97 	 * session_valid. The time taken depends on the capacitance
98 	 * on VBUS line. The max discharge time can be upto 1 sec
99 	 * as per the spec. Typically on our platform, it is 200ms
100 	 */
101 	if (!is_on)
102 		mdelay(200);
103 
104 	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
105 		usb_otg_state_string(musb->xceiv->otg->state),
106 		musb_readb(musb->mregs, MUSB_DEVCTL));
107 }
108 
109 static int musb_otg_notifications(struct notifier_block *nb,
110 		unsigned long event, void *unused)
111 {
112 	struct musb *musb = container_of(nb, struct musb, nb);
113 
114 	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
115 			event, usb_otg_state_string(musb->xceiv->otg->state));
116 
117 	switch (event) {
118 	case UX500_MUSB_ID:
119 		dev_dbg(musb->controller, "ID GND\n");
120 		ux500_musb_set_vbus(musb, 1);
121 		break;
122 	case UX500_MUSB_VBUS:
123 		dev_dbg(musb->controller, "VBUS Connect\n");
124 		break;
125 	case UX500_MUSB_NONE:
126 		dev_dbg(musb->controller, "VBUS Disconnect\n");
127 		if (is_host_active(musb))
128 			ux500_musb_set_vbus(musb, 0);
129 		else
130 			musb->xceiv->otg->state = OTG_STATE_B_IDLE;
131 		break;
132 	default:
133 		dev_dbg(musb->controller, "ID float\n");
134 		return NOTIFY_DONE;
135 	}
136 	return NOTIFY_OK;
137 }
138 
139 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
140 {
141 	unsigned long   flags;
142 	irqreturn_t     retval = IRQ_NONE;
143 	struct musb     *musb = __hci;
144 
145 	spin_lock_irqsave(&musb->lock, flags);
146 
147 	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
148 	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
149 	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
150 
151 	if (musb->int_usb || musb->int_tx || musb->int_rx)
152 		retval = musb_interrupt(musb);
153 
154 	spin_unlock_irqrestore(&musb->lock, flags);
155 
156 	return retval;
157 }
158 
159 static int ux500_musb_init(struct musb *musb)
160 {
161 	int status;
162 
163 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
164 	if (IS_ERR_OR_NULL(musb->xceiv)) {
165 		pr_err("HS USB OTG: no transceiver configured\n");
166 		return -EPROBE_DEFER;
167 	}
168 
169 	musb->nb.notifier_call = musb_otg_notifications;
170 	status = usb_register_notifier(musb->xceiv, &musb->nb);
171 	if (status < 0) {
172 		dev_dbg(musb->controller, "notification register failed\n");
173 		return status;
174 	}
175 
176 	musb->isr = ux500_musb_interrupt;
177 
178 	return 0;
179 }
180 
181 static int ux500_musb_exit(struct musb *musb)
182 {
183 	usb_unregister_notifier(musb->xceiv, &musb->nb);
184 
185 	usb_put_phy(musb->xceiv);
186 
187 	return 0;
188 }
189 
190 static const struct musb_platform_ops ux500_ops = {
191 	.quirks		= MUSB_DMA_UX500 | MUSB_INDEXED_EP,
192 #ifdef CONFIG_USB_UX500_DMA
193 	.dma_init	= ux500_dma_controller_create,
194 	.dma_exit	= ux500_dma_controller_destroy,
195 #endif
196 	.init		= ux500_musb_init,
197 	.exit		= ux500_musb_exit,
198 	.fifo_mode	= 5,
199 
200 	.set_vbus	= ux500_musb_set_vbus,
201 };
202 
203 static struct musb_hdrc_platform_data *
204 ux500_of_probe(struct platform_device *pdev, struct device_node *np)
205 {
206 	struct musb_hdrc_platform_data *pdata;
207 	const char *mode;
208 	int strlen;
209 
210 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
211 	if (!pdata)
212 		return NULL;
213 
214 	mode = of_get_property(np, "dr_mode", &strlen);
215 	if (!mode) {
216 		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
217 		return NULL;
218 	}
219 
220 	if (strlen > 0) {
221 		if (!strcmp(mode, "host"))
222 			pdata->mode = MUSB_HOST;
223 		if (!strcmp(mode, "otg"))
224 			pdata->mode = MUSB_OTG;
225 		if (!strcmp(mode, "peripheral"))
226 			pdata->mode = MUSB_PERIPHERAL;
227 	}
228 
229 	return pdata;
230 }
231 
232 static int ux500_probe(struct platform_device *pdev)
233 {
234 	struct resource musb_resources[2];
235 	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
236 	struct device_node		*np = pdev->dev.of_node;
237 	struct platform_device		*musb;
238 	struct ux500_glue		*glue;
239 	struct clk			*clk;
240 	int				ret = -ENOMEM;
241 
242 	if (!pdata) {
243 		if (np) {
244 			pdata = ux500_of_probe(pdev, np);
245 			if (!pdata)
246 				goto err0;
247 
248 			pdev->dev.platform_data = pdata;
249 		} else {
250 			dev_err(&pdev->dev, "no pdata or device tree found\n");
251 			goto err0;
252 		}
253 	}
254 
255 	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
256 	if (!glue)
257 		goto err0;
258 
259 	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
260 	if (!musb) {
261 		dev_err(&pdev->dev, "failed to allocate musb device\n");
262 		goto err0;
263 	}
264 
265 	clk = devm_clk_get(&pdev->dev, NULL);
266 	if (IS_ERR(clk)) {
267 		dev_err(&pdev->dev, "failed to get clock\n");
268 		ret = PTR_ERR(clk);
269 		goto err1;
270 	}
271 
272 	ret = clk_prepare_enable(clk);
273 	if (ret) {
274 		dev_err(&pdev->dev, "failed to enable clock\n");
275 		goto err1;
276 	}
277 
278 	musb->dev.parent		= &pdev->dev;
279 	musb->dev.dma_mask		= &pdev->dev.coherent_dma_mask;
280 	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;
281 
282 	glue->dev			= &pdev->dev;
283 	glue->musb			= musb;
284 	glue->clk			= clk;
285 
286 	pdata->platform_ops		= &ux500_ops;
287 	pdata->config 			= &ux500_musb_hdrc_config;
288 
289 	platform_set_drvdata(pdev, glue);
290 
291 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
292 			ARRAY_SIZE(musb_resources));
293 
294 	musb_resources[0].name = pdev->resource[0].name;
295 	musb_resources[0].start = pdev->resource[0].start;
296 	musb_resources[0].end = pdev->resource[0].end;
297 	musb_resources[0].flags = pdev->resource[0].flags;
298 
299 	musb_resources[1].name = pdev->resource[1].name;
300 	musb_resources[1].start = pdev->resource[1].start;
301 	musb_resources[1].end = pdev->resource[1].end;
302 	musb_resources[1].flags = pdev->resource[1].flags;
303 
304 	ret = platform_device_add_resources(musb, musb_resources,
305 			ARRAY_SIZE(musb_resources));
306 	if (ret) {
307 		dev_err(&pdev->dev, "failed to add resources\n");
308 		goto err2;
309 	}
310 
311 	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
312 	if (ret) {
313 		dev_err(&pdev->dev, "failed to add platform_data\n");
314 		goto err2;
315 	}
316 
317 	ret = platform_device_add(musb);
318 	if (ret) {
319 		dev_err(&pdev->dev, "failed to register musb device\n");
320 		goto err2;
321 	}
322 
323 	return 0;
324 
325 err2:
326 	clk_disable_unprepare(clk);
327 
328 err1:
329 	platform_device_put(musb);
330 
331 err0:
332 	return ret;
333 }
334 
335 static int ux500_remove(struct platform_device *pdev)
336 {
337 	struct ux500_glue	*glue = platform_get_drvdata(pdev);
338 
339 	platform_device_unregister(glue->musb);
340 	clk_disable_unprepare(glue->clk);
341 
342 	return 0;
343 }
344 
345 #ifdef CONFIG_PM_SLEEP
346 static int ux500_suspend(struct device *dev)
347 {
348 	struct ux500_glue	*glue = dev_get_drvdata(dev);
349 	struct musb		*musb = glue_to_musb(glue);
350 
351 	if (musb)
352 		usb_phy_set_suspend(musb->xceiv, 1);
353 
354 	clk_disable_unprepare(glue->clk);
355 
356 	return 0;
357 }
358 
359 static int ux500_resume(struct device *dev)
360 {
361 	struct ux500_glue	*glue = dev_get_drvdata(dev);
362 	struct musb		*musb = glue_to_musb(glue);
363 	int			ret;
364 
365 	ret = clk_prepare_enable(glue->clk);
366 	if (ret) {
367 		dev_err(dev, "failed to enable clock\n");
368 		return ret;
369 	}
370 
371 	if (musb)
372 		usb_phy_set_suspend(musb->xceiv, 0);
373 
374 	return 0;
375 }
376 #endif
377 
378 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
379 
380 static const struct of_device_id ux500_match[] = {
381         { .compatible = "stericsson,db8500-musb", },
382         {}
383 };
384 
385 MODULE_DEVICE_TABLE(of, ux500_match);
386 
387 static struct platform_driver ux500_driver = {
388 	.probe		= ux500_probe,
389 	.remove		= ux500_remove,
390 	.driver		= {
391 		.name	= "musb-ux500",
392 		.pm	= &ux500_pm_ops,
393 		.of_match_table = ux500_match,
394 	},
395 };
396 
397 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
398 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
399 MODULE_LICENSE("GPL v2");
400 module_platform_driver(ux500_driver);
401