summaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/davinci.c
blob: 9d63ba4d10d6fe1500cf1b73e3ccf5e3c111f952 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
/*
 * Copyright (C) 2005-2006 by Texas Instruments
 *
 * This file is part of the Inventra Controller Driver for Linux.
 *
 * The Inventra Controller Driver for Linux is free software; you
 * can redistribute it and/or modify it under the terms of the GNU
 * General Public License version 2 as published by the Free Software
 * Foundation.
 *
 * The Inventra Controller Driver for Linux is distributed in
 * the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with The Inventra Controller Driver for Linux ; if not,
 * write to the Free Software Foundation, Inc., 59 Temple Place,
 * Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>

#include <mach/cputype.h>
#include <mach/hardware.h>

#include <asm/mach-types.h>

#include "musb_core.h"

#ifdef CONFIG_MACH_DAVINCI_EVM
#define GPIO_nVBUS_DRV		160
#endif

#include "davinci.h"
#include "cppi_dma.h"


#define USB_PHY_CTRL	IO_ADDRESS(USBPHY_CTL_PADDR)
#define DM355_DEEPSLEEP	IO_ADDRESS(DM355_DEEPSLEEP_PADDR)

struct davinci_glue {
	struct device		*dev;
	struct platform_device	*musb;
	struct clk		*clk;
};

/* REVISIT (PM) we should be able to keep the PHY in low power mode most
 * of the time (24 MHZ oscillator and PLL off, etc) by setting POWER.D0
 * and, when in host mode, autosuspending idle root ports... PHYPLLON
 * (overriding SUSPENDM?) then likely needs to stay off.
 */

static inline void phy_on(void)
{
	u32	phy_ctrl = __raw_readl(USB_PHY_CTRL);

	/* power everything up; start the on-chip PHY and its PLL */
	phy_ctrl &= ~(USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN);
	phy_ctrl |= USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON;
	__raw_writel(phy_ctrl, USB_PHY_CTRL);

	/* wait for PLL to lock before proceeding */
	while ((__raw_readl(USB_PHY_CTRL) & USBPHY_PHYCLKGD) == 0)
		cpu_relax();
}

static inline void phy_off(void)
{
	u32	phy_ctrl = __raw_readl(USB_PHY_CTRL);

	/* powerdown the on-chip PHY, its PLL, and the OTG block */
	phy_ctrl &= ~(USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON);
	phy_ctrl |= USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN;
	__raw_writel(phy_ctrl, USB_PHY_CTRL);
}

static int dma_off = 1;

static void davinci_musb_enable(struct musb *musb)
{
	u32	tmp, old, val;

	/* workaround:  setup irqs through both register sets */
	tmp = (musb->epmask & DAVINCI_USB_TX_ENDPTS_MASK)
			<< DAVINCI_USB_TXINT_SHIFT;
	musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);
	old = tmp;
	tmp = (musb->epmask & (0xfffe & DAVINCI_USB_RX_ENDPTS_MASK))
			<< DAVINCI_USB_RXINT_SHIFT;
	musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);
	tmp |= old;

	val = ~MUSB_INTR_SOF;
	tmp |= ((val & 0x01ff) << DAVINCI_USB_USBINT_SHIFT);
	musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);

	if (is_dma_capable() && !dma_off)
		printk(KERN_WARNING "%s %s: dma not reactivated\n",
				__FILE__, __func__);
	else
		dma_off = 0;

	/* force a DRVVBUS irq so we can start polling for ID change */
	if (is_otg_enabled(musb))
		musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG,
			DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT);
}

/*
 * Disable the HDRC and flush interrupts
 */
static void davinci_musb_disable(struct musb *musb)
{
	/* because we don't set CTRLR.UINT, "important" to:
	 *  - not read/write INTRUSB/INTRUSBE
	 *  - (except during initial setup, as workaround)
	 *  - use INTSETR/INTCLRR instead
	 */
	musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_CLR_REG,
			  DAVINCI_USB_USBINT_MASK
			| DAVINCI_USB_TXINT_MASK
			| DAVINCI_USB_RXINT_MASK);
	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
	musb_writel(musb->ctrl_base, DAVINCI_USB_EOI_REG, 0);

	if (is_dma_capable() && !dma_off)
		WARNING("dma still active\n");
}


#define	portstate(stmt)		stmt

/*
 * VBUS SWITCHING IS BOARD-SPECIFIC ... at least for the DM6446 EVM,
 * which doesn't wire DRVVBUS to the FET that switches it.  Unclear
 * if that's a problem with the DM6446 chip or just with that board.
 *
 * In either case, the DM355 EVM automates DRVVBUS the normal way,
 * when J10 is out, and TI documents it as handling OTG.
 */

#ifdef CONFIG_MACH_DAVINCI_EVM

static int vbus_state = -1;

/* I2C operations are always synchronous, and require a task context.
 * With unloaded systems, using the shared workqueue seems to suffice
 * to satisfy the 100msec A_WAIT_VRISE timeout...
 */
static void evm_deferred_drvvbus(struct work_struct *ignored)
{
	gpio_set_value_cansleep(GPIO_nVBUS_DRV, vbus_state);
	vbus_state = !vbus_state;
}

#endif	/* EVM */

static void davinci_musb_source_power(struct musb *musb, int is_on, int immediate)
{
#ifdef CONFIG_MACH_DAVINCI_EVM
	if (is_on)
		is_on = 1;

	if (vbus_state == is_on)
		return;
	vbus_state = !is_on;		/* 0/1 vs "-1 == unknown/init" */

	if (machine_is_davinci_evm()) {
		static DECLARE_WORK(evm_vbus_work, evm_deferred_drvvbus);

		if (immediate)
			gpio_set_value_cansleep(GPIO_nVBUS_DRV, vbus_state);
		else
			schedule_work(&evm_vbus_work);
	}
	if (immediate)
		vbus_state = is_on;
#endif
}

static void davinci_musb_set_vbus(struct musb *musb, int is_on)
{
	WARN_ON(is_on && is_peripheral_active(musb));
	davinci_musb_source_power(musb, is_on, 0);
}


#define	POLL_SECONDS	2

static struct timer_list otg_workaround;

static void otg_timer(unsigned long _musb)
{
	struct musb		*musb = (void *)_musb;
	void __iomem		*mregs = musb->mregs;
	u8			devctl;
	unsigned long		flags;

	/* We poll because DaVinci's won't expose several OTG-critical
	* status change events (from the transceiver) otherwise.
	 */
	devctl = musb_readb(mregs, MUSB_DEVCTL);
	dev_dbg(musb->controller, "poll devctl %02x (%s)\n", devctl,
		otg_state_string(musb->xceiv->state));

	spin_lock_irqsave(&musb->lock, flags);
	switch (musb->xceiv->state) {
	case OTG_STATE_A_WAIT_VFALL:
		/* Wait till VBUS falls below SessionEnd (~0.2V); the 1.3 RTL
		 * seems to mis-handle session "start" otherwise (or in our
		 * case "recover"), in routine "VBUS was valid by the time
		 * VBUSERR got reported during enumeration" cases.
		 */
		if (devctl & MUSB_DEVCTL_VBUS) {
			mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
			break;
		}
		musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
		musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG,
			MUSB_INTR_VBUSERROR << DAVINCI_USB_USBINT_SHIFT);
		break;
	case OTG_STATE_B_IDLE:
		if (!is_peripheral_enabled(musb))
			break;

		/* There's no ID-changed IRQ, so we have no good way to tell
		 * when to switch to the A-Default state machine (by setting
		 * the DEVCTL.SESSION flag).
		 *
		 * Workaround:  whenever we're in B_IDLE, try setting the
		 * session flag every few seconds.  If it works, ID was
		 * grounded and we're now in the A-Default state machine.
		 *
		 * NOTE setting the session flag is _supposed_ to trigger
		 * SRP, but clearly it doesn't.
		 */
		musb_writeb(mregs, MUSB_DEVCTL,
				devctl | MUSB_DEVCTL_SESSION);
		devctl = musb_readb(mregs, MUSB_DEVCTL);
		if (devctl & MUSB_DEVCTL_BDEVICE)
			mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
		else
			musb->xceiv->state = OTG_STATE_A_IDLE;
		break;
	default:
		break;
	}
	spin_unlock_irqrestore(&musb->lock, flags);
}

static irqreturn_t davinci_musb_interrupt(int irq, void *__hci)
{
	unsigned long	flags;
	irqreturn_t	retval = IRQ_NONE;
	struct musb	*musb = __hci;
	struct usb_otg	*otg = musb->xceiv->otg;
	void __iomem	*tibase = musb->ctrl_base;
	struct cppi	*cppi;
	u32		tmp;

	spin_lock_irqsave(&musb->lock, flags);

	/* NOTE: DaVinci shadows the Mentor IRQs.  Don't manage them through
	 * the Mentor registers (except for setup), use the TI ones and EOI.
	 *
	 * Docs describe irq "vector" registers associated with the CPPI and
	 * USB EOI registers.  These hold a bitmask corresponding to the
	 * current IRQ, not an irq handler address.  Would using those bits
	 * resolve some of the races observed in this dispatch code??
	 */

	/* CPPI interrupts share the same IRQ line, but have their own
	 * mask, state, "vector", and EOI registers.
	 */
	cppi = container_of(musb->dma_controller, struct cppi, controller);
	if (is_cppi_enabled() && musb->dma_controller && !cppi->irq)
		retval = cppi_interrupt(irq, __hci);

	/* ack and handle non-CPPI interrupts */
	tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);
	musb_writel(tibase, DAVINCI_USB_INT_SRC_CLR_REG, tmp);
	dev_dbg(musb->controller, "IRQ %08x\n", tmp);

	musb->int_rx = (tmp & DAVINCI_USB_RXINT_MASK)
			>> DAVINCI_USB_RXINT_SHIFT;
	musb->int_tx = (tmp & DAVINCI_USB_TXINT_MASK)
			>> DAVINCI_USB_TXINT_SHIFT;
	musb->int_usb = (tmp & DAVINCI_USB_USBINT_MASK)
			>> DAVINCI_USB_USBINT_SHIFT;

	/* DRVVBUS irqs are the only proxy we have (a very poor one!) for
	 * DaVinci's missing ID change IRQ.  We need an ID change IRQ to
	 * switch appropriately between halves of the OTG state machine.
	 * Managing DEVCTL.SESSION per Mentor docs requires we know its
	 * value, but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
	 * Also, DRVVBUS pulses for SRP (but not at 5V) ...
	 */
	if (tmp & (DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT)) {
		int	drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG);
		void __iomem *mregs = musb->mregs;
		u8	devctl = musb_readb(mregs, MUSB_DEVCTL);
		int	err = musb->int_usb & MUSB_INTR_VBUSERROR;

		err = is_host_enabled(musb)
				&& (musb->int_usb & MUSB_INTR_VBUSERROR);
		if (err) {
			/* The Mentor core doesn't debounce VBUS as needed
			 * to cope with device connect current spikes. This
			 * means it's not uncommon for bus-powered devices
			 * to get VBUS errors during enumeration.
			 *
			 * This is a workaround, but newer RTL from Mentor
			 * seems to allow a better one: "re"starting sessions
			 * without waiting (on EVM, a **long** time) for VBUS
			 * to stop registering in devctl.
			 */
			musb->int_usb &= ~MUSB_INTR_VBUSERROR;
			musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
			mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
			WARNING("VBUS error workaround (delay coming)\n");
		} else if (is_host_enabled(musb) && drvvbus) {
			MUSB_HST_MODE(musb);
			otg->default_a = 1;
			musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
			portstate(musb->port1_status |= USB_PORT_STAT_POWER);
			del_timer(&otg_workaround);
		} else {
			musb->is_active = 0;
			MUSB_DEV_MODE(musb);
			otg->default_a = 0;
			musb->xceiv->state = OTG_STATE_B_IDLE;
			portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
		}

		/* NOTE:  this must complete poweron within 100 msec
		 * (OTG_TIME_A_WAIT_VRISE) but we don't check for that.
		 */
		davinci_musb_source_power(musb, drvvbus, 0);
		dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
				drvvbus ? "on" : "off",
				otg_state_string(musb->xceiv->state),
				err ? " ERROR" : "",
				devctl);
		retval = IRQ_HANDLED;
	}

	if (musb->int_tx || musb->int_rx || musb->int_usb)
		retval |= musb_interrupt(musb);

	/* irq stays asserted until EOI is written */
	musb_writel(tibase, DAVINCI_USB_EOI_REG, 0);

	/* poll for ID change */
	if (is_otg_enabled(musb)
			&& musb->xceiv->state == OTG_STATE_B_IDLE)
		mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

static int davinci_musb_set_mode(struct musb *musb, u8 mode)
{
	/* EVM can't do this (right?) */
	return -EIO;
}

static int davinci_musb_init(struct musb *musb)
{
	void __iomem	*tibase = musb->ctrl_base;
	u32		revision;

	usb_nop_xceiv_register();
	musb->xceiv = usb_get_transceiver();
	if (!musb->xceiv)
		goto unregister;

	musb->mregs += DAVINCI_BASE_OFFSET;

	/* returns zero if e.g. not clocked */
	revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG);
	if (revision == 0)
		goto fail;

	if (is_host_enabled(musb))
		setup_timer(&otg_workaround, otg_timer, (unsigned long) musb);

	davinci_musb_source_power(musb, 0, 1);

	/* dm355 EVM swaps D+/D- for signal integrity, and
	 * is clocked from the main 24 MHz crystal.
	 */
	if (machine_is_davinci_dm355_evm()) {
		u32	phy_ctrl = __raw_readl(USB_PHY_CTRL);

		phy_ctrl &= ~(3 << 9);
		phy_ctrl |= USBPHY_DATAPOL;
		__raw_writel(phy_ctrl, USB_PHY_CTRL);
	}

	/* On dm355, the default-A state machine needs DRVVBUS control.
	 * If we won't be a host, there's no need to turn it on.
	 */
	if (cpu_is_davinci_dm355()) {
		u32	deepsleep = __raw_readl(DM355_DEEPSLEEP);

		if (is_host_enabled(musb)) {
			deepsleep &= ~DRVVBUS_OVERRIDE;
		} else {
			deepsleep &= ~DRVVBUS_FORCE;
			deepsleep |= DRVVBUS_OVERRIDE;
		}
		__raw_writel(deepsleep, DM355_DEEPSLEEP);
	}

	/* reset the controller */
	musb_writel(tibase, DAVINCI_USB_CTRL_REG, 0x1);

	/* start the on-chip PHY and its PLL */
	phy_on();

	msleep(5);

	/* NOTE:  irqs are in mixed mode, not bypass to pure-musb */
	pr_debug("DaVinci OTG revision %08x phy %03x control %02x\n",
		revision, __raw_readl(USB_PHY_CTRL),
		musb_readb(tibase, DAVINCI_USB_CTRL_REG));

	musb->isr = davinci_musb_interrupt;
	return 0;

fail:
	usb_put_transceiver(musb->xceiv);
unregister:
	usb_nop_xceiv_unregister();
	return -ENODEV;
}

static int davinci_musb_exit(struct musb *musb)
{
	if (is_host_enabled(musb))
		del_timer_sync(&otg_workaround);

	/* force VBUS off */
	if (cpu_is_davinci_dm355()) {
		u32	deepsleep = __raw_readl(DM355_DEEPSLEEP);

		deepsleep &= ~DRVVBUS_FORCE;
		deepsleep |= DRVVBUS_OVERRIDE;
		__raw_writel(deepsleep, DM355_DEEPSLEEP);
	}

	davinci_musb_source_power(musb, 0 /*off*/, 1);

	/* delay, to avoid problems with module reload */
	if (is_host_enabled(musb) && musb->xceiv->otg->default_a) {
		int	maxdelay = 30;
		u8	devctl, warn = 0;

		/* if there's no peripheral connected, this can take a
		 * long time to fall, especially on EVM with huge C133.
		 */
		do {
			devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
			if (!(devctl & MUSB_DEVCTL_VBUS))
				break;
			if ((devctl & MUSB_DEVCTL_VBUS) != warn) {
				warn = devctl & MUSB_DEVCTL_VBUS;
				dev_dbg(musb->controller, "VBUS %d\n",
					warn >> MUSB_DEVCTL_VBUS_SHIFT);
			}
			msleep(1000);
			maxdelay--;
		} while (maxdelay > 0);

		/* in OTG mode, another host might be connected */
		if (devctl & MUSB_DEVCTL_VBUS)
			dev_dbg(musb->controller, "VBUS off timeout (devctl %02x)\n", devctl);
	}

	phy_off();

	usb_put_transceiver(musb->xceiv);
	usb_nop_xceiv_unregister();

	return 0;
}

static const struct musb_platform_ops davinci_ops = {
	.init		= davinci_musb_init,
	.exit		= davinci_musb_exit,

	.enable		= davinci_musb_enable,
	.disable	= davinci_musb_disable,

	.set_mode	= davinci_musb_set_mode,

	.set_vbus	= davinci_musb_set_vbus,
};

static u64 davinci_dmamask = DMA_BIT_MASK(32);

static int __devinit davinci_probe(struct platform_device *pdev)
{
	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
	struct platform_device		*musb;
	struct davinci_glue		*glue;
	struct clk			*clk;

	int				ret = -ENOMEM;

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
		dev_err(&pdev->dev, "failed to allocate glue context\n");
		goto err0;
	}

	musb = platform_device_alloc("musb-hdrc", -1);
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
		goto err1;
	}

	clk = clk_get(&pdev->dev, "usb");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
		goto err2;
	}

	ret = clk_enable(clk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable clock\n");
		goto err3;
	}

	musb->dev.parent		= &pdev->dev;
	musb->dev.dma_mask		= &davinci_dmamask;
	musb->dev.coherent_dma_mask	= davinci_dmamask;

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->clk			= clk;

	pdata->platform_ops		= &davinci_ops;

	platform_set_drvdata(pdev, glue);

	ret = platform_device_add_resources(musb, pdev->resource,
			pdev->num_resources);
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
		goto err4;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
		goto err4;
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
		goto err4;
	}

	return 0;

err4:
	clk_disable(clk);

err3:
	clk_put(clk);

err2:
	platform_device_put(musb);

err1:
	kfree(glue);

err0:
	return ret;
}

static int __devexit davinci_remove(struct platform_device *pdev)
{
	struct davinci_glue		*glue = platform_get_drvdata(pdev);

	platform_device_del(glue->musb);
	platform_device_put(glue->musb);
	clk_disable(glue->clk);
	clk_put(glue->clk);
	kfree(glue);

	return 0;
}

static struct platform_driver davinci_driver = {
	.probe		= davinci_probe,
	.remove		= __devexit_p(davinci_remove),
	.driver		= {
		.name	= "musb-davinci",
	},
};

MODULE_DESCRIPTION("DaVinci MUSB Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");

static int __init davinci_init(void)
{
	return platform_driver_register(&davinci_driver);
}
module_init(davinci_init);

static void __exit davinci_exit(void)
{
	platform_driver_unregister(&davinci_driver);
}
module_exit(davinci_exit);