2 * Texas Instruments DSPS platforms "glue layer"
4 * Copyright (C) 2012, by Texas Instruments
6 * Based on the am35x "glue layer" code.
8 * This file is part of the Inventra Controller Driver for Linux.
10 * The Inventra Controller Driver for Linux is free software; you
11 * can redistribute it and/or modify it under the terms of the GNU
12 * General Public License version 2 as published by the Free Software
15 * The Inventra Controller Driver for Linux is distributed in
16 * the hope that it will be useful, but WITHOUT ANY WARRANTY;
17 * without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
19 * License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with The Inventra Controller Driver for Linux ; if not,
23 * write to the Free Software Foundation, Inc., 59 Temple Place,
24 * Suite 330, Boston, MA 02111-1307 USA
26 * musb_dsps.c will be a common file for all the TI DSPS platforms
27 * such as dm64x, dm36x, dm35x, da8x, am35x and ti81x.
28 * For now only ti81x is using this and in future davinci.c, am35x.c
29 * da8xx.c would be merged to this file after testing.
32 #include <linux/init.h>
35 #include <linux/err.h>
36 #include <linux/platform_device.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/module.h>
40 #include <linux/usb/nop-usb-xceiv.h>
43 #include <linux/of_device.h>
44 #include <linux/of_address.h>
48 #include "musb_core.h"
51 static const struct of_device_id musb_dsps_of_match
[];
55 * avoid using musb_readx()/musb_writex() as glue layer should not be
56 * dependent on musb core layer symbols.
58 static inline u8
dsps_readb(const void __iomem
*addr
, unsigned offset
)
59 { return __raw_readb(addr
+ offset
); }
61 static inline u32
dsps_readl(const void __iomem
*addr
, unsigned offset
)
62 { return __raw_readl(addr
+ offset
); }
64 static inline void dsps_writeb(void __iomem
*addr
, unsigned offset
, u8 data
)
65 { __raw_writeb(data
, addr
+ offset
); }
67 static inline void dsps_writel(void __iomem
*addr
, unsigned offset
, u32 data
)
68 { __raw_writel(data
, addr
+ offset
); }
71 * DSPS musb wrapper register offset.
72 * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
75 struct dsps_musb_wrapper
{
89 /* bit positions for control */
92 /* bit positions for interrupt */
98 unsigned txep_shift
:5;
102 unsigned rxep_shift
:5;
106 /* bit positions for phy_utmi */
107 unsigned otg_disable
:5;
109 /* bit positions for mode */
111 /* miscellaneous stuff */
112 u32 musb_core_offset
;
114 /* number of musb instances */
119 * DSPS glue structure.
123 struct platform_device
*musb
[2]; /* child musb pdev */
124 const struct dsps_musb_wrapper
*wrp
; /* wrapper register offsets */
125 struct timer_list timer
[2]; /* otg_workaround timer */
126 unsigned long last_timer
[2]; /* last timer data for each instance */
130 * dsps_musb_enable - enable interrupts
132 static void dsps_musb_enable(struct musb
*musb
)
134 struct device
*dev
= musb
->controller
;
135 struct platform_device
*pdev
= to_platform_device(dev
->parent
);
136 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
137 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
138 void __iomem
*reg_base
= musb
->ctrl_base
;
139 u32 epmask
, coremask
;
141 /* Workaround: setup IRQs through both register sets. */
142 epmask
= ((musb
->epmask
& wrp
->txep_mask
) << wrp
->txep_shift
) |
143 ((musb
->epmask
& wrp
->rxep_mask
) << wrp
->rxep_shift
);
144 coremask
= (wrp
->usb_bitmap
& ~MUSB_INTR_SOF
);
146 dsps_writel(reg_base
, wrp
->epintr_set
, epmask
);
147 dsps_writel(reg_base
, wrp
->coreintr_set
, coremask
);
148 /* Force the DRVVBUS IRQ so we can start polling for ID change. */
149 dsps_writel(reg_base
, wrp
->coreintr_set
,
150 (1 << wrp
->drvvbus
) << wrp
->usb_shift
);
154 * dsps_musb_disable - disable HDRC and flush interrupts
156 static void dsps_musb_disable(struct musb
*musb
)
158 struct device
*dev
= musb
->controller
;
159 struct platform_device
*pdev
= to_platform_device(dev
->parent
);
160 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
161 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
162 void __iomem
*reg_base
= musb
->ctrl_base
;
164 dsps_writel(reg_base
, wrp
->coreintr_clear
, wrp
->usb_bitmap
);
165 dsps_writel(reg_base
, wrp
->epintr_clear
,
166 wrp
->txep_bitmap
| wrp
->rxep_bitmap
);
167 dsps_writeb(musb
->mregs
, MUSB_DEVCTL
, 0);
168 dsps_writel(reg_base
, wrp
->eoi
, 0);
171 static void otg_timer(unsigned long _musb
)
173 struct musb
*musb
= (void *)_musb
;
174 void __iomem
*mregs
= musb
->mregs
;
175 struct device
*dev
= musb
->controller
;
176 struct platform_device
*pdev
= to_platform_device(dev
);
177 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
178 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
183 * We poll because DSPS IP's won't expose several OTG-critical
184 * status change events (from the transceiver) otherwise.
186 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
187 dev_dbg(musb
->controller
, "Poll devctl %02x (%s)\n", devctl
,
188 otg_state_string(musb
->xceiv
->state
));
190 spin_lock_irqsave(&musb
->lock
, flags
);
191 switch (musb
->xceiv
->state
) {
192 case OTG_STATE_A_WAIT_BCON
:
193 devctl
&= ~MUSB_DEVCTL_SESSION
;
194 dsps_writeb(musb
->mregs
, MUSB_DEVCTL
, devctl
);
196 devctl
= dsps_readb(musb
->mregs
, MUSB_DEVCTL
);
197 if (devctl
& MUSB_DEVCTL_BDEVICE
) {
198 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
201 musb
->xceiv
->state
= OTG_STATE_A_IDLE
;
205 case OTG_STATE_A_WAIT_VFALL
:
206 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VRISE
;
207 dsps_writel(musb
->ctrl_base
, wrp
->coreintr_set
,
208 MUSB_INTR_VBUSERROR
<< wrp
->usb_shift
);
210 case OTG_STATE_B_IDLE
:
211 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
212 if (devctl
& MUSB_DEVCTL_BDEVICE
)
213 mod_timer(&glue
->timer
[pdev
->id
],
214 jiffies
+ wrp
->poll_seconds
* HZ
);
216 musb
->xceiv
->state
= OTG_STATE_A_IDLE
;
221 spin_unlock_irqrestore(&musb
->lock
, flags
);
224 static void dsps_musb_try_idle(struct musb
*musb
, unsigned long timeout
)
226 struct device
*dev
= musb
->controller
;
227 struct platform_device
*pdev
= to_platform_device(dev
);
228 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
231 timeout
= jiffies
+ msecs_to_jiffies(3);
233 /* Never idle if active, or when VBUS timeout is not set as host */
234 if (musb
->is_active
|| (musb
->a_wait_bcon
== 0 &&
235 musb
->xceiv
->state
== OTG_STATE_A_WAIT_BCON
)) {
236 dev_dbg(musb
->controller
, "%s active, deleting timer\n",
237 otg_state_string(musb
->xceiv
->state
));
238 del_timer(&glue
->timer
[pdev
->id
]);
239 glue
->last_timer
[pdev
->id
] = jiffies
;
243 if (time_after(glue
->last_timer
[pdev
->id
], timeout
) &&
244 timer_pending(&glue
->timer
[pdev
->id
])) {
245 dev_dbg(musb
->controller
,
246 "Longer idle timer already pending, ignoring...\n");
249 glue
->last_timer
[pdev
->id
] = timeout
;
251 dev_dbg(musb
->controller
, "%s inactive, starting idle timer for %u ms\n",
252 otg_state_string(musb
->xceiv
->state
),
253 jiffies_to_msecs(timeout
- jiffies
));
254 mod_timer(&glue
->timer
[pdev
->id
], timeout
);
257 static irqreturn_t
dsps_interrupt(int irq
, void *hci
)
259 struct musb
*musb
= hci
;
260 void __iomem
*reg_base
= musb
->ctrl_base
;
261 struct device
*dev
= musb
->controller
;
262 struct platform_device
*pdev
= to_platform_device(dev
);
263 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
264 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
266 irqreturn_t ret
= IRQ_NONE
;
269 spin_lock_irqsave(&musb
->lock
, flags
);
271 /* Get endpoint interrupts */
272 epintr
= dsps_readl(reg_base
, wrp
->epintr_status
);
273 musb
->int_rx
= (epintr
& wrp
->rxep_bitmap
) >> wrp
->rxep_shift
;
274 musb
->int_tx
= (epintr
& wrp
->txep_bitmap
) >> wrp
->txep_shift
;
277 dsps_writel(reg_base
, wrp
->epintr_status
, epintr
);
279 /* Get usb core interrupts */
280 usbintr
= dsps_readl(reg_base
, wrp
->coreintr_status
);
281 if (!usbintr
&& !epintr
)
284 musb
->int_usb
= (usbintr
& wrp
->usb_bitmap
) >> wrp
->usb_shift
;
286 dsps_writel(reg_base
, wrp
->coreintr_status
, usbintr
);
288 dev_dbg(musb
->controller
, "usbintr (%x) epintr(%x)\n",
291 * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
292 * DSPS IP's missing ID change IRQ. We need an ID change IRQ to
293 * switch appropriately between halves of the OTG state machine.
294 * Managing DEVCTL.SESSION per Mentor docs requires that we know its
295 * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
296 * Also, DRVVBUS pulses for SRP (but not at 5V) ...
298 if (usbintr
& MUSB_INTR_BABBLE
)
299 pr_info("CAUTION: musb: Babble Interrupt Occured\n");
301 if (usbintr
& ((1 << wrp
->drvvbus
) << wrp
->usb_shift
)) {
302 int drvvbus
= dsps_readl(reg_base
, wrp
->status
);
303 void __iomem
*mregs
= musb
->mregs
;
304 u8 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
307 err
= musb
->int_usb
& MUSB_INTR_VBUSERROR
;
310 * The Mentor core doesn't debounce VBUS as needed
311 * to cope with device connect current spikes. This
312 * means it's not uncommon for bus-powered devices
313 * to get VBUS errors during enumeration.
315 * This is a workaround, but newer RTL from Mentor
316 * seems to allow a better one: "re"-starting sessions
317 * without waiting for VBUS to stop registering in
320 musb
->int_usb
&= ~MUSB_INTR_VBUSERROR
;
321 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VFALL
;
322 mod_timer(&glue
->timer
[pdev
->id
],
323 jiffies
+ wrp
->poll_seconds
* HZ
);
324 WARNING("VBUS error workaround (delay coming)\n");
325 } else if (drvvbus
) {
328 musb
->xceiv
->otg
->default_a
= 1;
329 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VRISE
;
330 del_timer(&glue
->timer
[pdev
->id
]);
334 musb
->xceiv
->otg
->default_a
= 0;
335 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
338 /* NOTE: this must complete power-on within 100 ms. */
339 dev_dbg(musb
->controller
, "VBUS %s (%s)%s, devctl %02x\n",
340 drvvbus
? "on" : "off",
341 otg_state_string(musb
->xceiv
->state
),
347 if (musb
->int_tx
|| musb
->int_rx
|| musb
->int_usb
)
348 ret
|= musb_interrupt(musb
);
351 /* EOI needs to be written for the IRQ to be re-asserted. */
352 if (ret
== IRQ_HANDLED
|| epintr
|| usbintr
)
353 dsps_writel(reg_base
, wrp
->eoi
, 1);
355 /* Poll for ID change */
356 if (musb
->xceiv
->state
== OTG_STATE_B_IDLE
)
357 mod_timer(&glue
->timer
[pdev
->id
],
358 jiffies
+ wrp
->poll_seconds
* HZ
);
360 spin_unlock_irqrestore(&musb
->lock
, flags
);
365 static int dsps_musb_init(struct musb
*musb
)
367 struct device
*dev
= musb
->controller
;
368 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
369 struct platform_device
*pdev
= to_platform_device(dev
);
370 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
371 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
372 struct omap_musb_board_data
*data
= plat
->board_data
;
373 void __iomem
*reg_base
= musb
->ctrl_base
;
377 /* mentor core register starts at offset of 0x400 from musb base */
378 musb
->mregs
+= wrp
->musb_core_offset
;
380 /* Get the NOP PHY */
381 musb
->xceiv
= usb_get_phy(USB_PHY_TYPE_USB2
);
382 if (IS_ERR_OR_NULL(musb
->xceiv
))
385 /* Returns zero if e.g. not clocked */
386 rev
= dsps_readl(reg_base
, wrp
->revision
);
392 setup_timer(&glue
->timer
[pdev
->id
], otg_timer
, (unsigned long) musb
);
395 dsps_writel(reg_base
, wrp
->control
, (1 << wrp
->reset
));
397 /* Start the on-chip PHY and its PLL. */
398 if (data
->set_phy_power
)
399 data
->set_phy_power(1);
401 musb
->isr
= dsps_interrupt
;
403 /* reset the otgdisable bit, needed for host mode to work */
404 val
= dsps_readl(reg_base
, wrp
->phy_utmi
);
405 val
&= ~(1 << wrp
->otg_disable
);
406 dsps_writel(musb
->ctrl_base
, wrp
->phy_utmi
, val
);
408 /* clear level interrupt */
409 dsps_writel(reg_base
, wrp
->eoi
, 0);
413 usb_put_phy(musb
->xceiv
);
414 usb_nop_xceiv_unregister();
418 static int dsps_musb_exit(struct musb
*musb
)
420 struct device
*dev
= musb
->controller
;
421 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
422 struct omap_musb_board_data
*data
= plat
->board_data
;
423 struct platform_device
*pdev
= to_platform_device(dev
);
424 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
426 del_timer_sync(&glue
->timer
[pdev
->id
]);
428 /* Shutdown the on-chip PHY and its PLL. */
429 if (data
->set_phy_power
)
430 data
->set_phy_power(0);
432 /* NOP driver needs change if supporting dual instance */
433 usb_put_phy(musb
->xceiv
);
434 usb_nop_xceiv_unregister();
439 static struct musb_platform_ops dsps_ops
= {
440 .init
= dsps_musb_init
,
441 .exit
= dsps_musb_exit
,
443 .enable
= dsps_musb_enable
,
444 .disable
= dsps_musb_disable
,
446 .try_idle
= dsps_musb_try_idle
,
449 static u64 musb_dmamask
= DMA_BIT_MASK(32);
451 static int __devinit
dsps_create_musb_pdev(struct dsps_glue
*glue
, u8 id
)
453 struct device
*dev
= glue
->dev
;
454 struct platform_device
*pdev
= to_platform_device(dev
);
455 struct musb_hdrc_platform_data
*pdata
= dev
->platform_data
;
456 struct device_node
*np
= pdev
->dev
.of_node
;
457 struct musb_hdrc_config
*config
;
458 struct platform_device
*musb
;
459 struct resource
*res
;
460 struct resource resources
[2];
464 /* get memory resource */
465 sprintf(res_name
, "musb%d", id
);
466 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, res_name
);
468 dev_err(dev
, "%s get mem resource failed\n", res_name
);
475 /* get irq resource */
476 sprintf(res_name
, "musb%d-irq", id
);
477 res
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, res_name
);
479 dev_err(dev
, "%s get irq resource failed\n", res_name
);
485 resources
[1].name
= "mc";
487 /* get the musb id */
488 musbid
= musb_get_id(dev
, GFP_KERNEL
);
490 dev_err(dev
, "failed to allocate musb id\n");
494 /* allocate the child platform device */
495 musb
= platform_device_alloc("musb-hdrc", musbid
);
497 dev_err(dev
, "failed to allocate musb device\n");
503 musb
->dev
.parent
= dev
;
504 musb
->dev
.dma_mask
= &musb_dmamask
;
505 musb
->dev
.coherent_dma_mask
= musb_dmamask
;
507 glue
->musb
[id
] = musb
;
509 ret
= platform_device_add_resources(musb
, resources
, 2);
511 dev_err(dev
, "failed to add resources\n");
516 pdata
= devm_kzalloc(&pdev
->dev
, sizeof(*pdata
), GFP_KERNEL
);
519 "failed to allocate musb platfrom data\n");
524 config
= devm_kzalloc(&pdev
->dev
, sizeof(*config
), GFP_KERNEL
);
527 "failed to allocate musb hdrc config\n");
531 of_property_read_u32(np
, "num-eps", (u32
*)&config
->num_eps
);
532 of_property_read_u32(np
, "ram-bits", (u32
*)&config
->ram_bits
);
533 sprintf(res_name
, "port%d-mode", id
);
534 of_property_read_u32(np
, res_name
, (u32
*)&pdata
->mode
);
535 of_property_read_u32(np
, "power", (u32
*)&pdata
->power
);
536 config
->multipoint
= of_property_read_bool(np
, "multipoint");
538 pdata
->config
= config
;
541 pdata
->platform_ops
= &dsps_ops
;
543 ret
= platform_device_add_data(musb
, pdata
, sizeof(*pdata
));
545 dev_err(dev
, "failed to add platform_data\n");
549 ret
= platform_device_add(musb
);
551 dev_err(dev
, "failed to register musb device\n");
558 platform_device_put(musb
);
560 musb_put_id(dev
, musbid
);
565 static void dsps_delete_musb_pdev(struct dsps_glue
*glue
, u8 id
)
567 musb_put_id(glue
->dev
, glue
->musb
[id
]->id
);
568 platform_device_del(glue
->musb
[id
]);
569 platform_device_put(glue
->musb
[id
]);
572 static int __devinit
dsps_probe(struct platform_device
*pdev
)
574 struct device_node
*np
= pdev
->dev
.of_node
;
575 const struct of_device_id
*match
;
576 const struct dsps_musb_wrapper
*wrp
;
577 struct dsps_glue
*glue
;
578 struct resource
*iomem
;
581 match
= of_match_node(musb_dsps_of_match
, np
);
583 dev_err(&pdev
->dev
, "fail to get matching of_match struct\n");
590 glue
= kzalloc(sizeof(*glue
), GFP_KERNEL
);
592 dev_err(&pdev
->dev
, "unable to allocate glue memory\n");
597 /* get memory resource */
598 iomem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
600 dev_err(&pdev
->dev
, "failed to get usbss mem resourse\n");
605 glue
->dev
= &pdev
->dev
;
607 glue
->wrp
= kmemdup(wrp
, sizeof(*wrp
), GFP_KERNEL
);
609 dev_err(&pdev
->dev
, "failed to duplicate wrapper struct memory\n");
613 platform_set_drvdata(pdev
, glue
);
615 /* enable the usbss clocks */
616 pm_runtime_enable(&pdev
->dev
);
618 ret
= pm_runtime_get_sync(&pdev
->dev
);
620 dev_err(&pdev
->dev
, "pm_runtime_get_sync FAILED");
624 /* create the child platform device for all instances of musb */
625 for (i
= 0; i
< wrp
->instances
; i
++) {
626 ret
= dsps_create_musb_pdev(glue
, i
);
628 dev_err(&pdev
->dev
, "failed to create child pdev\n");
629 /* release resources of previously created instances */
630 for (i
--; i
>= 0 ; i
--)
631 dsps_delete_musb_pdev(glue
, i
);
639 pm_runtime_put(&pdev
->dev
);
641 pm_runtime_disable(&pdev
->dev
);
648 static int __devexit
dsps_remove(struct platform_device
*pdev
)
650 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
651 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
654 /* delete the child platform device */
655 for (i
= 0; i
< wrp
->instances
; i
++)
656 dsps_delete_musb_pdev(glue
, i
);
658 /* disable usbss clocks */
659 pm_runtime_put(&pdev
->dev
);
660 pm_runtime_disable(&pdev
->dev
);
666 #ifdef CONFIG_PM_SLEEP
667 static int dsps_suspend(struct device
*dev
)
669 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
670 struct omap_musb_board_data
*data
= plat
->board_data
;
672 /* Shutdown the on-chip PHY and its PLL. */
673 if (data
->set_phy_power
)
674 data
->set_phy_power(0);
679 static int dsps_resume(struct device
*dev
)
681 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
682 struct omap_musb_board_data
*data
= plat
->board_data
;
684 /* Start the on-chip PHY and its PLL. */
685 if (data
->set_phy_power
)
686 data
->set_phy_power(1);
692 static SIMPLE_DEV_PM_OPS(dsps_pm_ops
, dsps_suspend
, dsps_resume
);
694 static const struct dsps_musb_wrapper ti81xx_driver_data __devinitconst
= {
700 .epintr_clear
= 0x40,
701 .epintr_status
= 0x30,
702 .coreintr_set
= 0x3c,
703 .coreintr_clear
= 0x44,
704 .coreintr_status
= 0x34,
712 .usb_bitmap
= (0x1ff << 0),
716 .txep_bitmap
= (0xffff << 0),
719 .rxep_bitmap
= (0xfffe << 16),
720 .musb_core_offset
= 0x400,
725 static const struct platform_device_id musb_dsps_id_table
[] __devinitconst
= {
727 .name
= "musb-ti81xx",
728 .driver_data
= (kernel_ulong_t
) &ti81xx_driver_data
,
730 { }, /* Terminating Entry */
732 MODULE_DEVICE_TABLE(platform
, musb_dsps_id_table
);
735 static const struct of_device_id musb_dsps_of_match
[] __devinitconst
= {
736 { .compatible
= "ti,musb-am33xx",
737 .data
= (void *) &ti81xx_driver_data
, },
740 MODULE_DEVICE_TABLE(of
, musb_dsps_of_match
);
743 static struct platform_driver dsps_usbss_driver
= {
745 .remove
= __devexit_p(dsps_remove
),
749 .of_match_table
= of_match_ptr(musb_dsps_of_match
),
751 .id_table
= musb_dsps_id_table
,
754 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
755 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
756 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
757 MODULE_LICENSE("GPL v2");
759 static int __init
dsps_init(void)
761 return platform_driver_register(&dsps_usbss_driver
);
763 subsys_initcall(dsps_init
);
765 static void __exit
dsps_exit(void)
767 platform_driver_unregister(&dsps_usbss_driver
);
769 module_exit(dsps_exit
);