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>
41 #include <linux/platform_data/usb-omap.h>
44 #include <linux/of_device.h>
45 #include <linux/of_address.h>
47 #include "musb_core.h"
50 static const struct of_device_id musb_dsps_of_match
[];
54 * avoid using musb_readx()/musb_writex() as glue layer should not be
55 * dependent on musb core layer symbols.
57 static inline u8
dsps_readb(const void __iomem
*addr
, unsigned offset
)
58 { return __raw_readb(addr
+ offset
); }
60 static inline u32
dsps_readl(const void __iomem
*addr
, unsigned offset
)
61 { return __raw_readl(addr
+ offset
); }
63 static inline void dsps_writeb(void __iomem
*addr
, unsigned offset
, u8 data
)
64 { __raw_writeb(data
, addr
+ offset
); }
66 static inline void dsps_writel(void __iomem
*addr
, unsigned offset
, u32 data
)
67 { __raw_writel(data
, addr
+ offset
); }
70 * DSPS musb wrapper register offset.
71 * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
74 struct dsps_musb_wrapper
{
88 /* bit positions for control */
91 /* bit positions for interrupt */
97 unsigned txep_shift
:5;
101 unsigned rxep_shift
:5;
105 /* bit positions for phy_utmi */
106 unsigned otg_disable
:5;
108 /* bit positions for mode */
110 /* miscellaneous stuff */
111 u32 musb_core_offset
;
113 /* number of musb instances */
118 * DSPS glue structure.
122 struct platform_device
*musb
[2]; /* child musb pdev */
123 const struct dsps_musb_wrapper
*wrp
; /* wrapper register offsets */
124 struct timer_list timer
[2]; /* otg_workaround timer */
125 unsigned long last_timer
[2]; /* last timer data for each instance */
129 * dsps_musb_enable - enable interrupts
131 static void dsps_musb_enable(struct musb
*musb
)
133 struct device
*dev
= musb
->controller
;
134 struct platform_device
*pdev
= to_platform_device(dev
->parent
);
135 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
136 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
137 void __iomem
*reg_base
= musb
->ctrl_base
;
138 u32 epmask
, coremask
;
140 /* Workaround: setup IRQs through both register sets. */
141 epmask
= ((musb
->epmask
& wrp
->txep_mask
) << wrp
->txep_shift
) |
142 ((musb
->epmask
& wrp
->rxep_mask
) << wrp
->rxep_shift
);
143 coremask
= (wrp
->usb_bitmap
& ~MUSB_INTR_SOF
);
145 dsps_writel(reg_base
, wrp
->epintr_set
, epmask
);
146 dsps_writel(reg_base
, wrp
->coreintr_set
, coremask
);
147 /* Force the DRVVBUS IRQ so we can start polling for ID change. */
148 dsps_writel(reg_base
, wrp
->coreintr_set
,
149 (1 << wrp
->drvvbus
) << wrp
->usb_shift
);
153 * dsps_musb_disable - disable HDRC and flush interrupts
155 static void dsps_musb_disable(struct musb
*musb
)
157 struct device
*dev
= musb
->controller
;
158 struct platform_device
*pdev
= to_platform_device(dev
->parent
);
159 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
160 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
161 void __iomem
*reg_base
= musb
->ctrl_base
;
163 dsps_writel(reg_base
, wrp
->coreintr_clear
, wrp
->usb_bitmap
);
164 dsps_writel(reg_base
, wrp
->epintr_clear
,
165 wrp
->txep_bitmap
| wrp
->rxep_bitmap
);
166 dsps_writeb(musb
->mregs
, MUSB_DEVCTL
, 0);
167 dsps_writel(reg_base
, wrp
->eoi
, 0);
170 static void otg_timer(unsigned long _musb
)
172 struct musb
*musb
= (void *)_musb
;
173 void __iomem
*mregs
= musb
->mregs
;
174 struct device
*dev
= musb
->controller
;
175 struct platform_device
*pdev
= to_platform_device(dev
);
176 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
177 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
182 * We poll because DSPS IP's won't expose several OTG-critical
183 * status change events (from the transceiver) otherwise.
185 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
186 dev_dbg(musb
->controller
, "Poll devctl %02x (%s)\n", devctl
,
187 otg_state_string(musb
->xceiv
->state
));
189 spin_lock_irqsave(&musb
->lock
, flags
);
190 switch (musb
->xceiv
->state
) {
191 case OTG_STATE_A_WAIT_BCON
:
192 devctl
&= ~MUSB_DEVCTL_SESSION
;
193 dsps_writeb(musb
->mregs
, MUSB_DEVCTL
, devctl
);
195 devctl
= dsps_readb(musb
->mregs
, MUSB_DEVCTL
);
196 if (devctl
& MUSB_DEVCTL_BDEVICE
) {
197 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
200 musb
->xceiv
->state
= OTG_STATE_A_IDLE
;
204 case OTG_STATE_A_WAIT_VFALL
:
205 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VRISE
;
206 dsps_writel(musb
->ctrl_base
, wrp
->coreintr_set
,
207 MUSB_INTR_VBUSERROR
<< wrp
->usb_shift
);
209 case OTG_STATE_B_IDLE
:
210 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
211 if (devctl
& MUSB_DEVCTL_BDEVICE
)
212 mod_timer(&glue
->timer
[pdev
->id
],
213 jiffies
+ wrp
->poll_seconds
* HZ
);
215 musb
->xceiv
->state
= OTG_STATE_A_IDLE
;
220 spin_unlock_irqrestore(&musb
->lock
, flags
);
223 static void dsps_musb_try_idle(struct musb
*musb
, unsigned long timeout
)
225 struct device
*dev
= musb
->controller
;
226 struct platform_device
*pdev
= to_platform_device(dev
);
227 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
230 timeout
= jiffies
+ msecs_to_jiffies(3);
232 /* Never idle if active, or when VBUS timeout is not set as host */
233 if (musb
->is_active
|| (musb
->a_wait_bcon
== 0 &&
234 musb
->xceiv
->state
== OTG_STATE_A_WAIT_BCON
)) {
235 dev_dbg(musb
->controller
, "%s active, deleting timer\n",
236 otg_state_string(musb
->xceiv
->state
));
237 del_timer(&glue
->timer
[pdev
->id
]);
238 glue
->last_timer
[pdev
->id
] = jiffies
;
242 if (time_after(glue
->last_timer
[pdev
->id
], timeout
) &&
243 timer_pending(&glue
->timer
[pdev
->id
])) {
244 dev_dbg(musb
->controller
,
245 "Longer idle timer already pending, ignoring...\n");
248 glue
->last_timer
[pdev
->id
] = timeout
;
250 dev_dbg(musb
->controller
, "%s inactive, starting idle timer for %u ms\n",
251 otg_state_string(musb
->xceiv
->state
),
252 jiffies_to_msecs(timeout
- jiffies
));
253 mod_timer(&glue
->timer
[pdev
->id
], timeout
);
256 static irqreturn_t
dsps_interrupt(int irq
, void *hci
)
258 struct musb
*musb
= hci
;
259 void __iomem
*reg_base
= musb
->ctrl_base
;
260 struct device
*dev
= musb
->controller
;
261 struct platform_device
*pdev
= to_platform_device(dev
);
262 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
263 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
265 irqreturn_t ret
= IRQ_NONE
;
268 spin_lock_irqsave(&musb
->lock
, flags
);
270 /* Get endpoint interrupts */
271 epintr
= dsps_readl(reg_base
, wrp
->epintr_status
);
272 musb
->int_rx
= (epintr
& wrp
->rxep_bitmap
) >> wrp
->rxep_shift
;
273 musb
->int_tx
= (epintr
& wrp
->txep_bitmap
) >> wrp
->txep_shift
;
276 dsps_writel(reg_base
, wrp
->epintr_status
, epintr
);
278 /* Get usb core interrupts */
279 usbintr
= dsps_readl(reg_base
, wrp
->coreintr_status
);
280 if (!usbintr
&& !epintr
)
283 musb
->int_usb
= (usbintr
& wrp
->usb_bitmap
) >> wrp
->usb_shift
;
285 dsps_writel(reg_base
, wrp
->coreintr_status
, usbintr
);
287 dev_dbg(musb
->controller
, "usbintr (%x) epintr(%x)\n",
290 * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
291 * DSPS IP's missing ID change IRQ. We need an ID change IRQ to
292 * switch appropriately between halves of the OTG state machine.
293 * Managing DEVCTL.SESSION per Mentor docs requires that we know its
294 * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
295 * Also, DRVVBUS pulses for SRP (but not at 5V) ...
297 if (usbintr
& MUSB_INTR_BABBLE
)
298 pr_info("CAUTION: musb: Babble Interrupt Occured\n");
300 if (usbintr
& ((1 << wrp
->drvvbus
) << wrp
->usb_shift
)) {
301 int drvvbus
= dsps_readl(reg_base
, wrp
->status
);
302 void __iomem
*mregs
= musb
->mregs
;
303 u8 devctl
= dsps_readb(mregs
, MUSB_DEVCTL
);
306 err
= musb
->int_usb
& MUSB_INTR_VBUSERROR
;
309 * The Mentor core doesn't debounce VBUS as needed
310 * to cope with device connect current spikes. This
311 * means it's not uncommon for bus-powered devices
312 * to get VBUS errors during enumeration.
314 * This is a workaround, but newer RTL from Mentor
315 * seems to allow a better one: "re"-starting sessions
316 * without waiting for VBUS to stop registering in
319 musb
->int_usb
&= ~MUSB_INTR_VBUSERROR
;
320 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VFALL
;
321 mod_timer(&glue
->timer
[pdev
->id
],
322 jiffies
+ wrp
->poll_seconds
* HZ
);
323 WARNING("VBUS error workaround (delay coming)\n");
324 } else if (drvvbus
) {
327 musb
->xceiv
->otg
->default_a
= 1;
328 musb
->xceiv
->state
= OTG_STATE_A_WAIT_VRISE
;
329 del_timer(&glue
->timer
[pdev
->id
]);
333 musb
->xceiv
->otg
->default_a
= 0;
334 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
337 /* NOTE: this must complete power-on within 100 ms. */
338 dev_dbg(musb
->controller
, "VBUS %s (%s)%s, devctl %02x\n",
339 drvvbus
? "on" : "off",
340 otg_state_string(musb
->xceiv
->state
),
346 if (musb
->int_tx
|| musb
->int_rx
|| musb
->int_usb
)
347 ret
|= musb_interrupt(musb
);
350 /* EOI needs to be written for the IRQ to be re-asserted. */
351 if (ret
== IRQ_HANDLED
|| epintr
|| usbintr
)
352 dsps_writel(reg_base
, wrp
->eoi
, 1);
354 /* Poll for ID change */
355 if (musb
->xceiv
->state
== OTG_STATE_B_IDLE
)
356 mod_timer(&glue
->timer
[pdev
->id
],
357 jiffies
+ wrp
->poll_seconds
* HZ
);
359 spin_unlock_irqrestore(&musb
->lock
, flags
);
364 static int dsps_musb_init(struct musb
*musb
)
366 struct device
*dev
= musb
->controller
;
367 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
368 struct platform_device
*pdev
= to_platform_device(dev
);
369 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
370 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
371 struct omap_musb_board_data
*data
= plat
->board_data
;
372 void __iomem
*reg_base
= musb
->ctrl_base
;
376 /* mentor core register starts at offset of 0x400 from musb base */
377 musb
->mregs
+= wrp
->musb_core_offset
;
379 /* Get the NOP PHY */
380 musb
->xceiv
= usb_get_phy(USB_PHY_TYPE_USB2
);
381 if (IS_ERR_OR_NULL(musb
->xceiv
))
384 /* Returns zero if e.g. not clocked */
385 rev
= dsps_readl(reg_base
, wrp
->revision
);
391 setup_timer(&glue
->timer
[pdev
->id
], otg_timer
, (unsigned long) musb
);
394 dsps_writel(reg_base
, wrp
->control
, (1 << wrp
->reset
));
396 /* Start the on-chip PHY and its PLL. */
397 if (data
->set_phy_power
)
398 data
->set_phy_power(1);
400 musb
->isr
= dsps_interrupt
;
402 /* reset the otgdisable bit, needed for host mode to work */
403 val
= dsps_readl(reg_base
, wrp
->phy_utmi
);
404 val
&= ~(1 << wrp
->otg_disable
);
405 dsps_writel(musb
->ctrl_base
, wrp
->phy_utmi
, val
);
407 /* clear level interrupt */
408 dsps_writel(reg_base
, wrp
->eoi
, 0);
412 usb_put_phy(musb
->xceiv
);
413 usb_nop_xceiv_unregister();
417 static int dsps_musb_exit(struct musb
*musb
)
419 struct device
*dev
= musb
->controller
;
420 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
421 struct omap_musb_board_data
*data
= plat
->board_data
;
422 struct platform_device
*pdev
= to_platform_device(dev
);
423 struct dsps_glue
*glue
= dev_get_drvdata(dev
->parent
);
425 del_timer_sync(&glue
->timer
[pdev
->id
]);
427 /* Shutdown the on-chip PHY and its PLL. */
428 if (data
->set_phy_power
)
429 data
->set_phy_power(0);
431 /* NOP driver needs change if supporting dual instance */
432 usb_put_phy(musb
->xceiv
);
433 usb_nop_xceiv_unregister();
438 static struct musb_platform_ops dsps_ops
= {
439 .init
= dsps_musb_init
,
440 .exit
= dsps_musb_exit
,
442 .enable
= dsps_musb_enable
,
443 .disable
= dsps_musb_disable
,
445 .try_idle
= dsps_musb_try_idle
,
448 static u64 musb_dmamask
= DMA_BIT_MASK(32);
450 static int __devinit
dsps_create_musb_pdev(struct dsps_glue
*glue
, u8 id
)
452 struct device
*dev
= glue
->dev
;
453 struct platform_device
*pdev
= to_platform_device(dev
);
454 struct musb_hdrc_platform_data
*pdata
= dev
->platform_data
;
455 struct device_node
*np
= pdev
->dev
.of_node
;
456 struct musb_hdrc_config
*config
;
457 struct platform_device
*musb
;
458 struct resource
*res
;
459 struct resource resources
[2];
463 /* get memory resource */
464 snprintf(res_name
, sizeof(res_name
), "musb%d", id
);
465 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, res_name
);
467 dev_err(dev
, "%s get mem resource failed\n", res_name
);
474 /* get irq resource */
475 snprintf(res_name
, sizeof(res_name
), "musb%d-irq", id
);
476 res
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, res_name
);
478 dev_err(dev
, "%s get irq resource failed\n", res_name
);
484 resources
[1].name
= "mc";
486 /* get the musb id */
487 musbid
= musb_get_id(dev
, GFP_KERNEL
);
489 dev_err(dev
, "failed to allocate musb id\n");
493 /* allocate the child platform device */
494 musb
= platform_device_alloc("musb-hdrc", musbid
);
496 dev_err(dev
, "failed to allocate musb device\n");
502 musb
->dev
.parent
= dev
;
503 musb
->dev
.dma_mask
= &musb_dmamask
;
504 musb
->dev
.coherent_dma_mask
= musb_dmamask
;
506 glue
->musb
[id
] = musb
;
508 ret
= platform_device_add_resources(musb
, resources
, 2);
510 dev_err(dev
, "failed to add resources\n");
515 pdata
= devm_kzalloc(&pdev
->dev
, sizeof(*pdata
), GFP_KERNEL
);
518 "failed to allocate musb platfrom data\n");
523 config
= devm_kzalloc(&pdev
->dev
, sizeof(*config
), GFP_KERNEL
);
526 "failed to allocate musb hdrc config\n");
530 of_property_read_u32(np
, "num-eps", (u32
*)&config
->num_eps
);
531 of_property_read_u32(np
, "ram-bits", (u32
*)&config
->ram_bits
);
532 snprintf(res_name
, sizeof(res_name
), "port%d-mode", id
);
533 of_property_read_u32(np
, res_name
, (u32
*)&pdata
->mode
);
534 of_property_read_u32(np
, "power", (u32
*)&pdata
->power
);
535 config
->multipoint
= of_property_read_bool(np
, "multipoint");
537 pdata
->config
= config
;
540 pdata
->platform_ops
= &dsps_ops
;
542 ret
= platform_device_add_data(musb
, pdata
, sizeof(*pdata
));
544 dev_err(dev
, "failed to add platform_data\n");
548 ret
= platform_device_add(musb
);
550 dev_err(dev
, "failed to register musb device\n");
557 platform_device_put(musb
);
559 musb_put_id(dev
, musbid
);
564 static void dsps_delete_musb_pdev(struct dsps_glue
*glue
, u8 id
)
566 musb_put_id(glue
->dev
, glue
->musb
[id
]->id
);
567 platform_device_del(glue
->musb
[id
]);
568 platform_device_put(glue
->musb
[id
]);
571 static int __devinit
dsps_probe(struct platform_device
*pdev
)
573 struct device_node
*np
= pdev
->dev
.of_node
;
574 const struct of_device_id
*match
;
575 const struct dsps_musb_wrapper
*wrp
;
576 struct dsps_glue
*glue
;
577 struct resource
*iomem
;
580 match
= of_match_node(musb_dsps_of_match
, np
);
582 dev_err(&pdev
->dev
, "fail to get matching of_match struct\n");
589 glue
= kzalloc(sizeof(*glue
), GFP_KERNEL
);
591 dev_err(&pdev
->dev
, "unable to allocate glue memory\n");
596 /* get memory resource */
597 iomem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
599 dev_err(&pdev
->dev
, "failed to get usbss mem resourse\n");
604 glue
->dev
= &pdev
->dev
;
606 glue
->wrp
= kmemdup(wrp
, sizeof(*wrp
), GFP_KERNEL
);
608 dev_err(&pdev
->dev
, "failed to duplicate wrapper struct memory\n");
612 platform_set_drvdata(pdev
, glue
);
614 /* enable the usbss clocks */
615 pm_runtime_enable(&pdev
->dev
);
617 ret
= pm_runtime_get_sync(&pdev
->dev
);
619 dev_err(&pdev
->dev
, "pm_runtime_get_sync FAILED");
623 /* create the child platform device for all instances of musb */
624 for (i
= 0; i
< wrp
->instances
; i
++) {
625 ret
= dsps_create_musb_pdev(glue
, i
);
627 dev_err(&pdev
->dev
, "failed to create child pdev\n");
628 /* release resources of previously created instances */
629 for (i
--; i
>= 0 ; i
--)
630 dsps_delete_musb_pdev(glue
, i
);
638 pm_runtime_put(&pdev
->dev
);
640 pm_runtime_disable(&pdev
->dev
);
647 static int __devexit
dsps_remove(struct platform_device
*pdev
)
649 struct dsps_glue
*glue
= platform_get_drvdata(pdev
);
650 const struct dsps_musb_wrapper
*wrp
= glue
->wrp
;
653 /* delete the child platform device */
654 for (i
= 0; i
< wrp
->instances
; i
++)
655 dsps_delete_musb_pdev(glue
, i
);
657 /* disable usbss clocks */
658 pm_runtime_put(&pdev
->dev
);
659 pm_runtime_disable(&pdev
->dev
);
665 #ifdef CONFIG_PM_SLEEP
666 static int dsps_suspend(struct device
*dev
)
668 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
669 struct omap_musb_board_data
*data
= plat
->board_data
;
671 /* Shutdown the on-chip PHY and its PLL. */
672 if (data
->set_phy_power
)
673 data
->set_phy_power(0);
678 static int dsps_resume(struct device
*dev
)
680 struct musb_hdrc_platform_data
*plat
= dev
->platform_data
;
681 struct omap_musb_board_data
*data
= plat
->board_data
;
683 /* Start the on-chip PHY and its PLL. */
684 if (data
->set_phy_power
)
685 data
->set_phy_power(1);
691 static SIMPLE_DEV_PM_OPS(dsps_pm_ops
, dsps_suspend
, dsps_resume
);
693 static const struct dsps_musb_wrapper ti81xx_driver_data __devinitconst
= {
699 .epintr_clear
= 0x40,
700 .epintr_status
= 0x30,
701 .coreintr_set
= 0x3c,
702 .coreintr_clear
= 0x44,
703 .coreintr_status
= 0x34,
711 .usb_bitmap
= (0x1ff << 0),
715 .txep_bitmap
= (0xffff << 0),
718 .rxep_bitmap
= (0xfffe << 16),
719 .musb_core_offset
= 0x400,
724 static const struct platform_device_id musb_dsps_id_table
[] __devinitconst
= {
726 .name
= "musb-ti81xx",
727 .driver_data
= (kernel_ulong_t
) &ti81xx_driver_data
,
729 { }, /* Terminating Entry */
731 MODULE_DEVICE_TABLE(platform
, musb_dsps_id_table
);
734 static const struct of_device_id musb_dsps_of_match
[] __devinitconst
= {
735 { .compatible
= "ti,musb-am33xx",
736 .data
= (void *) &ti81xx_driver_data
, },
739 MODULE_DEVICE_TABLE(of
, musb_dsps_of_match
);
742 static struct platform_driver dsps_usbss_driver
= {
744 .remove
= __devexit_p(dsps_remove
),
748 .of_match_table
= of_match_ptr(musb_dsps_of_match
),
750 .id_table
= musb_dsps_id_table
,
753 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
754 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
755 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
756 MODULE_LICENSE("GPL v2");
758 static int __init
dsps_init(void)
760 return platform_driver_register(&dsps_usbss_driver
);
762 subsys_initcall(dsps_init
);
764 static void __exit
dsps_exit(void)
766 platform_driver_unregister(&dsps_usbss_driver
);
768 module_exit(dsps_exit
);