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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Texas Instruments DA8xx/OMAP-L1x "glue layer"
4 *
5 * Copyright (c) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
6 *
7 * Based on the DaVinci "glue layer" code.
8 * Copyright (C) 2005-2006 by Texas Instruments
9 *
10 * DT support
11 * Copyright (c) 2016 Petr Kulhavy <petr@barix.com>
12 *
13 * This file is part of the Inventra Controller Driver for Linux.
14 */
15
16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/err.h>
19#include <linux/io.h>
20#include <linux/of.h>
21#include <linux/of_platform.h>
22#include <linux/phy/phy.h>
23#include <linux/platform_device.h>
24#include <linux/dma-mapping.h>
25#include <linux/usb/usb_phy_generic.h>
26
27#include "musb_core.h"
28
29/*
30 * DA8XX specific definitions
31 */
32
33/* USB 2.0 OTG module registers */
34#define DA8XX_USB_REVISION_REG 0x00
35#define DA8XX_USB_CTRL_REG 0x04
36#define DA8XX_USB_STAT_REG 0x08
37#define DA8XX_USB_EMULATION_REG 0x0c
38#define DA8XX_USB_SRP_FIX_TIME_REG 0x18
39#define DA8XX_USB_INTR_SRC_REG 0x20
40#define DA8XX_USB_INTR_SRC_SET_REG 0x24
41#define DA8XX_USB_INTR_SRC_CLEAR_REG 0x28
42#define DA8XX_USB_INTR_MASK_REG 0x2c
43#define DA8XX_USB_INTR_MASK_SET_REG 0x30
44#define DA8XX_USB_INTR_MASK_CLEAR_REG 0x34
45#define DA8XX_USB_INTR_SRC_MASKED_REG 0x38
46#define DA8XX_USB_END_OF_INTR_REG 0x3c
47#define DA8XX_USB_GENERIC_RNDIS_EP_SIZE_REG(n) (0x50 + (((n) - 1) << 2))
48
49/* Control register bits */
50#define DA8XX_SOFT_RESET_MASK 1
51
52#define DA8XX_USB_TX_EP_MASK 0x1f /* EP0 + 4 Tx EPs */
53#define DA8XX_USB_RX_EP_MASK 0x1e /* 4 Rx EPs */
54
55/* USB interrupt register bits */
56#define DA8XX_INTR_USB_SHIFT 16
57#define DA8XX_INTR_USB_MASK (0x1ff << DA8XX_INTR_USB_SHIFT) /* 8 Mentor */
58 /* interrupts and DRVVBUS interrupt */
59#define DA8XX_INTR_DRVVBUS 0x100
60#define DA8XX_INTR_RX_SHIFT 8
61#define DA8XX_INTR_RX_MASK (DA8XX_USB_RX_EP_MASK << DA8XX_INTR_RX_SHIFT)
62#define DA8XX_INTR_TX_SHIFT 0
63#define DA8XX_INTR_TX_MASK (DA8XX_USB_TX_EP_MASK << DA8XX_INTR_TX_SHIFT)
64
65#define DA8XX_MENTOR_CORE_OFFSET 0x400
66
67struct da8xx_glue {
68 struct device *dev;
69 struct platform_device *musb;
70 struct platform_device *usb_phy;
71 struct clk *clk;
72 struct phy *phy;
73};
74
75/*
76 * Because we don't set CTRL.UINT, it's "important" to:
77 * - not read/write INTRUSB/INTRUSBE (except during
78 * initial setup, as a workaround);
79 * - use INTSET/INTCLR instead.
80 */
81
82/**
83 * da8xx_musb_enable - enable interrupts
84 */
85static void da8xx_musb_enable(struct musb *musb)
86{
87 void __iomem *reg_base = musb->ctrl_base;
88 u32 mask;
89
90 /* Workaround: setup IRQs through both register sets. */
91 mask = ((musb->epmask & DA8XX_USB_TX_EP_MASK) << DA8XX_INTR_TX_SHIFT) |
92 ((musb->epmask & DA8XX_USB_RX_EP_MASK) << DA8XX_INTR_RX_SHIFT) |
93 DA8XX_INTR_USB_MASK;
94 musb_writel(reg_base, DA8XX_USB_INTR_MASK_SET_REG, mask);
95
96 /* Force the DRVVBUS IRQ so we can start polling for ID change. */
97 musb_writel(reg_base, DA8XX_USB_INTR_SRC_SET_REG,
98 DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT);
99}
100
101/**
102 * da8xx_musb_disable - disable HDRC and flush interrupts
103 */
104static void da8xx_musb_disable(struct musb *musb)
105{
106 void __iomem *reg_base = musb->ctrl_base;
107
108 musb_writel(reg_base, DA8XX_USB_INTR_MASK_CLEAR_REG,
109 DA8XX_INTR_USB_MASK |
110 DA8XX_INTR_TX_MASK | DA8XX_INTR_RX_MASK);
111 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
112}
113
114#define portstate(stmt) stmt
115
116static void da8xx_musb_set_vbus(struct musb *musb, int is_on)
117{
118 WARN_ON(is_on && is_peripheral_active(musb));
119}
120
121#define POLL_SECONDS 2
122
123static void otg_timer(struct timer_list *t)
124{
125 struct musb *musb = from_timer(musb, t, dev_timer);
126 void __iomem *mregs = musb->mregs;
127 u8 devctl;
128 unsigned long flags;
129
130 /*
131 * We poll because DaVinci's won't expose several OTG-critical
132 * status change events (from the transceiver) otherwise.
133 */
134 devctl = musb_readb(mregs, MUSB_DEVCTL);
135 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
136 usb_otg_state_string(musb->xceiv->otg->state));
137
138 spin_lock_irqsave(&musb->lock, flags);
139 switch (musb->xceiv->otg->state) {
140 case OTG_STATE_A_WAIT_BCON:
141 devctl &= ~MUSB_DEVCTL_SESSION;
142 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
143
144 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
145 if (devctl & MUSB_DEVCTL_BDEVICE) {
146 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
147 MUSB_DEV_MODE(musb);
148 } else {
149 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
150 MUSB_HST_MODE(musb);
151 }
152 break;
153 case OTG_STATE_A_WAIT_VFALL:
154 /*
155 * Wait till VBUS falls below SessionEnd (~0.2 V); the 1.3
156 * RTL seems to mis-handle session "start" otherwise (or in
157 * our case "recover"), in routine "VBUS was valid by the time
158 * VBUSERR got reported during enumeration" cases.
159 */
160 if (devctl & MUSB_DEVCTL_VBUS) {
161 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
162 break;
163 }
164 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
165 musb_writel(musb->ctrl_base, DA8XX_USB_INTR_SRC_SET_REG,
166 MUSB_INTR_VBUSERROR << DA8XX_INTR_USB_SHIFT);
167 break;
168 case OTG_STATE_B_IDLE:
169 /*
170 * There's no ID-changed IRQ, so we have no good way to tell
171 * when to switch to the A-Default state machine (by setting
172 * the DEVCTL.Session bit).
173 *
174 * Workaround: whenever we're in B_IDLE, try setting the
175 * session flag every few seconds. If it works, ID was
176 * grounded and we're now in the A-Default state machine.
177 *
178 * NOTE: setting the session flag is _supposed_ to trigger
179 * SRP but clearly it doesn't.
180 */
181 musb_writeb(mregs, MUSB_DEVCTL, devctl | MUSB_DEVCTL_SESSION);
182 devctl = musb_readb(mregs, MUSB_DEVCTL);
183 if (devctl & MUSB_DEVCTL_BDEVICE)
184 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
185 else
186 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
187 break;
188 default:
189 break;
190 }
191 spin_unlock_irqrestore(&musb->lock, flags);
192}
193
194static void da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
195{
196 static unsigned long last_timer;
197
198 if (timeout == 0)
199 timeout = jiffies + msecs_to_jiffies(3);
200
201 /* Never idle if active, or when VBUS timeout is not set as host */
202 if (musb->is_active || (musb->a_wait_bcon == 0 &&
203 musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) {
204 dev_dbg(musb->controller, "%s active, deleting timer\n",
205 usb_otg_state_string(musb->xceiv->otg->state));
206 del_timer(&musb->dev_timer);
207 last_timer = jiffies;
208 return;
209 }
210
211 if (time_after(last_timer, timeout) && timer_pending(&musb->dev_timer)) {
212 dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n");
213 return;
214 }
215 last_timer = timeout;
216
217 dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
218 usb_otg_state_string(musb->xceiv->otg->state),
219 jiffies_to_msecs(timeout - jiffies));
220 mod_timer(&musb->dev_timer, timeout);
221}
222
223static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
224{
225 struct musb *musb = hci;
226 void __iomem *reg_base = musb->ctrl_base;
227 unsigned long flags;
228 irqreturn_t ret = IRQ_NONE;
229 u32 status;
230
231 spin_lock_irqsave(&musb->lock, flags);
232
233 /*
234 * NOTE: DA8XX shadows the Mentor IRQs. Don't manage them through
235 * the Mentor registers (except for setup), use the TI ones and EOI.
236 */
237
238 /* Acknowledge and handle non-CPPI interrupts */
239 status = musb_readl(reg_base, DA8XX_USB_INTR_SRC_MASKED_REG);
240 if (!status)
241 goto eoi;
242
243 musb_writel(reg_base, DA8XX_USB_INTR_SRC_CLEAR_REG, status);
244 dev_dbg(musb->controller, "USB IRQ %08x\n", status);
245
246 musb->int_rx = (status & DA8XX_INTR_RX_MASK) >> DA8XX_INTR_RX_SHIFT;
247 musb->int_tx = (status & DA8XX_INTR_TX_MASK) >> DA8XX_INTR_TX_SHIFT;
248 musb->int_usb = (status & DA8XX_INTR_USB_MASK) >> DA8XX_INTR_USB_SHIFT;
249
250 /*
251 * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
252 * DA8xx's missing ID change IRQ. We need an ID change IRQ to
253 * switch appropriately between halves of the OTG state machine.
254 * Managing DEVCTL.Session per Mentor docs requires that we know its
255 * value but DEVCTL.BDevice is invalid without DEVCTL.Session set.
256 * Also, DRVVBUS pulses for SRP (but not at 5 V)...
257 */
258 if (status & (DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT)) {
259 int drvvbus = musb_readl(reg_base, DA8XX_USB_STAT_REG);
260 void __iomem *mregs = musb->mregs;
261 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
262 int err;
263
264 err = musb->int_usb & MUSB_INTR_VBUSERROR;
265 if (err) {
266 /*
267 * The Mentor core doesn't debounce VBUS as needed
268 * to cope with device connect current spikes. This
269 * means it's not uncommon for bus-powered devices
270 * to get VBUS errors during enumeration.
271 *
272 * This is a workaround, but newer RTL from Mentor
273 * seems to allow a better one: "re"-starting sessions
274 * without waiting for VBUS to stop registering in
275 * devctl.
276 */
277 musb->int_usb &= ~MUSB_INTR_VBUSERROR;
278 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
279 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
280 WARNING("VBUS error workaround (delay coming)\n");
281 } else if (drvvbus) {
282 MUSB_HST_MODE(musb);
283 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
284 portstate(musb->port1_status |= USB_PORT_STAT_POWER);
285 del_timer(&musb->dev_timer);
286 } else if (!(musb->int_usb & MUSB_INTR_BABBLE)) {
287 /*
288 * When babble condition happens, drvvbus interrupt
289 * is also generated. Ignore this drvvbus interrupt
290 * and let babble interrupt handler recovers the
291 * controller; otherwise, the host-mode flag is lost
292 * due to the MUSB_DEV_MODE() call below and babble
293 * recovery logic will not be called.
294 */
295 musb->is_active = 0;
296 MUSB_DEV_MODE(musb);
297 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
298 portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
299 }
300
301 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
302 drvvbus ? "on" : "off",
303 usb_otg_state_string(musb->xceiv->otg->state),
304 err ? " ERROR" : "",
305 devctl);
306 ret = IRQ_HANDLED;
307 }
308
309 if (musb->int_tx || musb->int_rx || musb->int_usb)
310 ret |= musb_interrupt(musb);
311
312 eoi:
313 /* EOI needs to be written for the IRQ to be re-asserted. */
314 if (ret == IRQ_HANDLED || status)
315 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
316
317 /* Poll for ID change */
318 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE)
319 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
320
321 spin_unlock_irqrestore(&musb->lock, flags);
322
323 return ret;
324}
325
326static int da8xx_musb_set_mode(struct musb *musb, u8 musb_mode)
327{
328 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
329 enum phy_mode phy_mode;
330
331 /*
332 * The PHY has some issues when it is forced in device or host mode.
333 * Unless the user request another mode, configure the PHY in OTG mode.
334 */
335 if (!musb->is_initialized)
336 return phy_set_mode(glue->phy, PHY_MODE_USB_OTG);
337
338 switch (musb_mode) {
339 case MUSB_HOST: /* Force VBUS valid, ID = 0 */
340 phy_mode = PHY_MODE_USB_HOST;
341 break;
342 case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
343 phy_mode = PHY_MODE_USB_DEVICE;
344 break;
345 case MUSB_OTG: /* Don't override the VBUS/ID comparators */
346 phy_mode = PHY_MODE_USB_OTG;
347 break;
348 default:
349 return -EINVAL;
350 }
351
352 return phy_set_mode(glue->phy, phy_mode);
353}
354
355static int da8xx_musb_init(struct musb *musb)
356{
357 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
358 void __iomem *reg_base = musb->ctrl_base;
359 u32 rev;
360 int ret = -ENODEV;
361
362 musb->mregs += DA8XX_MENTOR_CORE_OFFSET;
363
364 ret = clk_prepare_enable(glue->clk);
365 if (ret) {
366 dev_err(glue->dev, "failed to enable clock\n");
367 return ret;
368 }
369
370 /* Returns zero if e.g. not clocked */
371 rev = musb_readl(reg_base, DA8XX_USB_REVISION_REG);
372 if (!rev) {
373 ret = -ENODEV;
374 goto fail;
375 }
376
377 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
378 if (IS_ERR_OR_NULL(musb->xceiv)) {
379 ret = -EPROBE_DEFER;
380 goto fail;
381 }
382
383 timer_setup(&musb->dev_timer, otg_timer, 0);
384
385 /* Reset the controller */
386 musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);
387
388 /* Start the on-chip PHY and its PLL. */
389 ret = phy_init(glue->phy);
390 if (ret) {
391 dev_err(glue->dev, "Failed to init phy.\n");
392 goto fail;
393 }
394
395 ret = phy_power_on(glue->phy);
396 if (ret) {
397 dev_err(glue->dev, "Failed to power on phy.\n");
398 goto err_phy_power_on;
399 }
400
401 msleep(5);
402
403 /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
404 pr_debug("DA8xx OTG revision %08x, control %02x\n", rev,
405 musb_readb(reg_base, DA8XX_USB_CTRL_REG));
406
407 musb->isr = da8xx_musb_interrupt;
408 return 0;
409
410err_phy_power_on:
411 phy_exit(glue->phy);
412fail:
413 clk_disable_unprepare(glue->clk);
414 return ret;
415}
416
417static int da8xx_musb_exit(struct musb *musb)
418{
419 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
420
421 del_timer_sync(&musb->dev_timer);
422
423 phy_power_off(glue->phy);
424 phy_exit(glue->phy);
425 clk_disable_unprepare(glue->clk);
426
427 usb_put_phy(musb->xceiv);
428
429 return 0;
430}
431
432static inline u8 get_vbus_power(struct device *dev)
433{
434 struct regulator *vbus_supply;
435 int current_uA;
436
437 vbus_supply = regulator_get_optional(dev, "vbus");
438 if (IS_ERR(vbus_supply))
439 return 255;
440 current_uA = regulator_get_current_limit(vbus_supply);
441 regulator_put(vbus_supply);
442 if (current_uA <= 0 || current_uA > 510000)
443 return 255;
444 return current_uA / 1000 / 2;
445}
446
447#ifdef CONFIG_USB_TI_CPPI41_DMA
448static void da8xx_dma_controller_callback(struct dma_controller *c)
449{
450 struct musb *musb = c->musb;
451 void __iomem *reg_base = musb->ctrl_base;
452
453 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
454}
455
456static struct dma_controller *
457da8xx_dma_controller_create(struct musb *musb, void __iomem *base)
458{
459 struct dma_controller *controller;
460
461 controller = cppi41_dma_controller_create(musb, base);
462 if (IS_ERR_OR_NULL(controller))
463 return controller;
464
465 controller->dma_callback = da8xx_dma_controller_callback;
466
467 return controller;
468}
469#endif
470
471static const struct musb_platform_ops da8xx_ops = {
472 .quirks = MUSB_INDEXED_EP | MUSB_PRESERVE_SESSION |
473 MUSB_DMA_CPPI41 | MUSB_DA8XX,
474 .init = da8xx_musb_init,
475 .exit = da8xx_musb_exit,
476
477 .fifo_mode = 2,
478#ifdef CONFIG_USB_TI_CPPI41_DMA
479 .dma_init = da8xx_dma_controller_create,
480 .dma_exit = cppi41_dma_controller_destroy,
481#endif
482 .enable = da8xx_musb_enable,
483 .disable = da8xx_musb_disable,
484
485 .set_mode = da8xx_musb_set_mode,
486 .try_idle = da8xx_musb_try_idle,
487
488 .set_vbus = da8xx_musb_set_vbus,
489};
490
491static const struct platform_device_info da8xx_dev_info = {
492 .name = "musb-hdrc",
493 .id = PLATFORM_DEVID_AUTO,
494 .dma_mask = DMA_BIT_MASK(32),
495};
496
497static const struct musb_hdrc_config da8xx_config = {
498 .ram_bits = 10,
499 .num_eps = 5,
500 .multipoint = 1,
501};
502
503static struct of_dev_auxdata da8xx_auxdata_lookup[] = {
504 OF_DEV_AUXDATA("ti,da830-cppi41", 0x01e01000, "cppi41-dmaengine",
505 NULL),
506 {}
507};
508
509static int da8xx_probe(struct platform_device *pdev)
510{
511 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
512 struct da8xx_glue *glue;
513 struct platform_device_info pinfo;
514 struct clk *clk;
515 struct device_node *np = pdev->dev.of_node;
516 int ret;
517
518 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
519 if (!glue)
520 return -ENOMEM;
521
522 clk = devm_clk_get(&pdev->dev, NULL);
523 if (IS_ERR(clk)) {
524 dev_err(&pdev->dev, "failed to get clock\n");
525 return PTR_ERR(clk);
526 }
527
528 glue->phy = devm_phy_get(&pdev->dev, "usb-phy");
529 if (IS_ERR(glue->phy))
530 return dev_err_probe(&pdev->dev, PTR_ERR(glue->phy),
531 "failed to get phy\n");
532
533 glue->dev = &pdev->dev;
534 glue->clk = clk;
535
536 if (IS_ENABLED(CONFIG_OF) && np) {
537 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
538 if (!pdata)
539 return -ENOMEM;
540
541 pdata->config = &da8xx_config;
542 pdata->mode = musb_get_mode(&pdev->dev);
543 pdata->power = get_vbus_power(&pdev->dev);
544 }
545
546 pdata->platform_ops = &da8xx_ops;
547
548 glue->usb_phy = usb_phy_generic_register();
549 ret = PTR_ERR_OR_ZERO(glue->usb_phy);
550 if (ret) {
551 dev_err(&pdev->dev, "failed to register usb_phy\n");
552 return ret;
553 }
554 platform_set_drvdata(pdev, glue);
555
556 ret = of_platform_populate(pdev->dev.of_node, NULL,
557 da8xx_auxdata_lookup, &pdev->dev);
558 if (ret)
559 return ret;
560
561 pinfo = da8xx_dev_info;
562 pinfo.parent = &pdev->dev;
563 pinfo.res = pdev->resource;
564 pinfo.num_res = pdev->num_resources;
565 pinfo.data = pdata;
566 pinfo.size_data = sizeof(*pdata);
567 pinfo.fwnode = of_fwnode_handle(np);
568 pinfo.of_node_reused = true;
569
570 glue->musb = platform_device_register_full(&pinfo);
571 ret = PTR_ERR_OR_ZERO(glue->musb);
572 if (ret) {
573 dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
574 usb_phy_generic_unregister(glue->usb_phy);
575 }
576
577 return ret;
578}
579
580static void da8xx_remove(struct platform_device *pdev)
581{
582 struct da8xx_glue *glue = platform_get_drvdata(pdev);
583
584 platform_device_unregister(glue->musb);
585 usb_phy_generic_unregister(glue->usb_phy);
586}
587
588#ifdef CONFIG_PM_SLEEP
589static int da8xx_suspend(struct device *dev)
590{
591 int ret;
592 struct da8xx_glue *glue = dev_get_drvdata(dev);
593
594 ret = phy_power_off(glue->phy);
595 if (ret)
596 return ret;
597 clk_disable_unprepare(glue->clk);
598
599 return 0;
600}
601
602static int da8xx_resume(struct device *dev)
603{
604 int ret;
605 struct da8xx_glue *glue = dev_get_drvdata(dev);
606
607 ret = clk_prepare_enable(glue->clk);
608 if (ret)
609 return ret;
610 return phy_power_on(glue->phy);
611}
612#endif
613
614static SIMPLE_DEV_PM_OPS(da8xx_pm_ops, da8xx_suspend, da8xx_resume);
615
616#ifdef CONFIG_OF
617static const struct of_device_id da8xx_id_table[] = {
618 {
619 .compatible = "ti,da830-musb",
620 },
621 {},
622};
623MODULE_DEVICE_TABLE(of, da8xx_id_table);
624#endif
625
626static struct platform_driver da8xx_driver = {
627 .probe = da8xx_probe,
628 .remove_new = da8xx_remove,
629 .driver = {
630 .name = "musb-da8xx",
631 .pm = &da8xx_pm_ops,
632 .of_match_table = of_match_ptr(da8xx_id_table),
633 },
634};
635
636MODULE_DESCRIPTION("DA8xx/OMAP-L1x MUSB Glue Layer");
637MODULE_AUTHOR("Sergei Shtylyov <sshtylyov@ru.mvista.com>");
638MODULE_LICENSE("GPL v2");
639module_platform_driver(da8xx_driver);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Texas Instruments DA8xx/OMAP-L1x "glue layer"
4 *
5 * Copyright (c) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
6 *
7 * Based on the DaVinci "glue layer" code.
8 * Copyright (C) 2005-2006 by Texas Instruments
9 *
10 * DT support
11 * Copyright (c) 2016 Petr Kulhavy <petr@barix.com>
12 *
13 * This file is part of the Inventra Controller Driver for Linux.
14 */
15
16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/err.h>
19#include <linux/io.h>
20#include <linux/of.h>
21#include <linux/of_platform.h>
22#include <linux/phy/phy.h>
23#include <linux/platform_device.h>
24#include <linux/dma-mapping.h>
25#include <linux/usb/usb_phy_generic.h>
26
27#include "musb_core.h"
28
29/*
30 * DA8XX specific definitions
31 */
32
33/* USB 2.0 OTG module registers */
34#define DA8XX_USB_REVISION_REG 0x00
35#define DA8XX_USB_CTRL_REG 0x04
36#define DA8XX_USB_STAT_REG 0x08
37#define DA8XX_USB_EMULATION_REG 0x0c
38#define DA8XX_USB_SRP_FIX_TIME_REG 0x18
39#define DA8XX_USB_INTR_SRC_REG 0x20
40#define DA8XX_USB_INTR_SRC_SET_REG 0x24
41#define DA8XX_USB_INTR_SRC_CLEAR_REG 0x28
42#define DA8XX_USB_INTR_MASK_REG 0x2c
43#define DA8XX_USB_INTR_MASK_SET_REG 0x30
44#define DA8XX_USB_INTR_MASK_CLEAR_REG 0x34
45#define DA8XX_USB_INTR_SRC_MASKED_REG 0x38
46#define DA8XX_USB_END_OF_INTR_REG 0x3c
47#define DA8XX_USB_GENERIC_RNDIS_EP_SIZE_REG(n) (0x50 + (((n) - 1) << 2))
48
49/* Control register bits */
50#define DA8XX_SOFT_RESET_MASK 1
51
52#define DA8XX_USB_TX_EP_MASK 0x1f /* EP0 + 4 Tx EPs */
53#define DA8XX_USB_RX_EP_MASK 0x1e /* 4 Rx EPs */
54
55/* USB interrupt register bits */
56#define DA8XX_INTR_USB_SHIFT 16
57#define DA8XX_INTR_USB_MASK (0x1ff << DA8XX_INTR_USB_SHIFT) /* 8 Mentor */
58 /* interrupts and DRVVBUS interrupt */
59#define DA8XX_INTR_DRVVBUS 0x100
60#define DA8XX_INTR_RX_SHIFT 8
61#define DA8XX_INTR_RX_MASK (DA8XX_USB_RX_EP_MASK << DA8XX_INTR_RX_SHIFT)
62#define DA8XX_INTR_TX_SHIFT 0
63#define DA8XX_INTR_TX_MASK (DA8XX_USB_TX_EP_MASK << DA8XX_INTR_TX_SHIFT)
64
65#define DA8XX_MENTOR_CORE_OFFSET 0x400
66
67struct da8xx_glue {
68 struct device *dev;
69 struct platform_device *musb;
70 struct platform_device *usb_phy;
71 struct clk *clk;
72 struct phy *phy;
73};
74
75/*
76 * Because we don't set CTRL.UINT, it's "important" to:
77 * - not read/write INTRUSB/INTRUSBE (except during
78 * initial setup, as a workaround);
79 * - use INTSET/INTCLR instead.
80 */
81
82/**
83 * da8xx_musb_enable - enable interrupts
84 */
85static void da8xx_musb_enable(struct musb *musb)
86{
87 void __iomem *reg_base = musb->ctrl_base;
88 u32 mask;
89
90 /* Workaround: setup IRQs through both register sets. */
91 mask = ((musb->epmask & DA8XX_USB_TX_EP_MASK) << DA8XX_INTR_TX_SHIFT) |
92 ((musb->epmask & DA8XX_USB_RX_EP_MASK) << DA8XX_INTR_RX_SHIFT) |
93 DA8XX_INTR_USB_MASK;
94 musb_writel(reg_base, DA8XX_USB_INTR_MASK_SET_REG, mask);
95
96 /* Force the DRVVBUS IRQ so we can start polling for ID change. */
97 musb_writel(reg_base, DA8XX_USB_INTR_SRC_SET_REG,
98 DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT);
99}
100
101/**
102 * da8xx_musb_disable - disable HDRC and flush interrupts
103 */
104static void da8xx_musb_disable(struct musb *musb)
105{
106 void __iomem *reg_base = musb->ctrl_base;
107
108 musb_writel(reg_base, DA8XX_USB_INTR_MASK_CLEAR_REG,
109 DA8XX_INTR_USB_MASK |
110 DA8XX_INTR_TX_MASK | DA8XX_INTR_RX_MASK);
111 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
112}
113
114#define portstate(stmt) stmt
115
116static void da8xx_musb_set_vbus(struct musb *musb, int is_on)
117{
118 WARN_ON(is_on && is_peripheral_active(musb));
119}
120
121#define POLL_SECONDS 2
122
123static void otg_timer(struct timer_list *t)
124{
125 struct musb *musb = from_timer(musb, t, dev_timer);
126 void __iomem *mregs = musb->mregs;
127 u8 devctl;
128 unsigned long flags;
129
130 /*
131 * We poll because DaVinci's won't expose several OTG-critical
132 * status change events (from the transceiver) otherwise.
133 */
134 devctl = musb_readb(mregs, MUSB_DEVCTL);
135 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
136 usb_otg_state_string(musb->xceiv->otg->state));
137
138 spin_lock_irqsave(&musb->lock, flags);
139 switch (musb->xceiv->otg->state) {
140 case OTG_STATE_A_WAIT_BCON:
141 devctl &= ~MUSB_DEVCTL_SESSION;
142 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
143
144 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
145 if (devctl & MUSB_DEVCTL_BDEVICE) {
146 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
147 MUSB_DEV_MODE(musb);
148 } else {
149 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
150 MUSB_HST_MODE(musb);
151 }
152 break;
153 case OTG_STATE_A_WAIT_VFALL:
154 /*
155 * Wait till VBUS falls below SessionEnd (~0.2 V); the 1.3
156 * RTL seems to mis-handle session "start" otherwise (or in
157 * our case "recover"), in routine "VBUS was valid by the time
158 * VBUSERR got reported during enumeration" cases.
159 */
160 if (devctl & MUSB_DEVCTL_VBUS) {
161 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
162 break;
163 }
164 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
165 musb_writel(musb->ctrl_base, DA8XX_USB_INTR_SRC_SET_REG,
166 MUSB_INTR_VBUSERROR << DA8XX_INTR_USB_SHIFT);
167 break;
168 case OTG_STATE_B_IDLE:
169 /*
170 * There's no ID-changed IRQ, so we have no good way to tell
171 * when to switch to the A-Default state machine (by setting
172 * the DEVCTL.Session bit).
173 *
174 * Workaround: whenever we're in B_IDLE, try setting the
175 * session flag every few seconds. If it works, ID was
176 * grounded and we're now in the A-Default state machine.
177 *
178 * NOTE: setting the session flag is _supposed_ to trigger
179 * SRP but clearly it doesn't.
180 */
181 musb_writeb(mregs, MUSB_DEVCTL, devctl | MUSB_DEVCTL_SESSION);
182 devctl = musb_readb(mregs, MUSB_DEVCTL);
183 if (devctl & MUSB_DEVCTL_BDEVICE)
184 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
185 else
186 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
187 break;
188 default:
189 break;
190 }
191 spin_unlock_irqrestore(&musb->lock, flags);
192}
193
194static void __maybe_unused da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
195{
196 static unsigned long last_timer;
197
198 if (timeout == 0)
199 timeout = jiffies + msecs_to_jiffies(3);
200
201 /* Never idle if active, or when VBUS timeout is not set as host */
202 if (musb->is_active || (musb->a_wait_bcon == 0 &&
203 musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) {
204 dev_dbg(musb->controller, "%s active, deleting timer\n",
205 usb_otg_state_string(musb->xceiv->otg->state));
206 del_timer(&musb->dev_timer);
207 last_timer = jiffies;
208 return;
209 }
210
211 if (time_after(last_timer, timeout) && timer_pending(&musb->dev_timer)) {
212 dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n");
213 return;
214 }
215 last_timer = timeout;
216
217 dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
218 usb_otg_state_string(musb->xceiv->otg->state),
219 jiffies_to_msecs(timeout - jiffies));
220 mod_timer(&musb->dev_timer, timeout);
221}
222
223static int da8xx_babble_recover(struct musb *musb)
224{
225 dev_dbg(musb->controller, "resetting controller to recover from babble\n");
226 musb_writel(musb->ctrl_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);
227 return 0;
228}
229
230static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
231{
232 struct musb *musb = hci;
233 void __iomem *reg_base = musb->ctrl_base;
234 unsigned long flags;
235 irqreturn_t ret = IRQ_NONE;
236 u32 status;
237
238 spin_lock_irqsave(&musb->lock, flags);
239
240 /*
241 * NOTE: DA8XX shadows the Mentor IRQs. Don't manage them through
242 * the Mentor registers (except for setup), use the TI ones and EOI.
243 */
244
245 /* Acknowledge and handle non-CPPI interrupts */
246 status = musb_readl(reg_base, DA8XX_USB_INTR_SRC_MASKED_REG);
247 if (!status)
248 goto eoi;
249
250 musb_writel(reg_base, DA8XX_USB_INTR_SRC_CLEAR_REG, status);
251 dev_dbg(musb->controller, "USB IRQ %08x\n", status);
252
253 musb->int_rx = (status & DA8XX_INTR_RX_MASK) >> DA8XX_INTR_RX_SHIFT;
254 musb->int_tx = (status & DA8XX_INTR_TX_MASK) >> DA8XX_INTR_TX_SHIFT;
255 musb->int_usb = (status & DA8XX_INTR_USB_MASK) >> DA8XX_INTR_USB_SHIFT;
256
257 /*
258 * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
259 * DA8xx's missing ID change IRQ. We need an ID change IRQ to
260 * switch appropriately between halves of the OTG state machine.
261 * Managing DEVCTL.Session per Mentor docs requires that we know its
262 * value but DEVCTL.BDevice is invalid without DEVCTL.Session set.
263 * Also, DRVVBUS pulses for SRP (but not at 5 V)...
264 */
265 if (status & (DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT)) {
266 int drvvbus = musb_readl(reg_base, DA8XX_USB_STAT_REG);
267 void __iomem *mregs = musb->mregs;
268 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
269 int err;
270
271 err = musb->int_usb & MUSB_INTR_VBUSERROR;
272 if (err) {
273 /*
274 * The Mentor core doesn't debounce VBUS as needed
275 * to cope with device connect current spikes. This
276 * means it's not uncommon for bus-powered devices
277 * to get VBUS errors during enumeration.
278 *
279 * This is a workaround, but newer RTL from Mentor
280 * seems to allow a better one: "re"-starting sessions
281 * without waiting for VBUS to stop registering in
282 * devctl.
283 */
284 musb->int_usb &= ~MUSB_INTR_VBUSERROR;
285 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
286 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
287 WARNING("VBUS error workaround (delay coming)\n");
288 } else if (drvvbus) {
289 MUSB_HST_MODE(musb);
290 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
291 portstate(musb->port1_status |= USB_PORT_STAT_POWER);
292 del_timer(&musb->dev_timer);
293 } else if (!(musb->int_usb & MUSB_INTR_BABBLE)) {
294 /*
295 * When babble condition happens, drvvbus interrupt
296 * is also generated. Ignore this drvvbus interrupt
297 * and let babble interrupt handler recovers the
298 * controller; otherwise, the host-mode flag is lost
299 * due to the MUSB_DEV_MODE() call below and babble
300 * recovery logic will not be called.
301 */
302 musb->is_active = 0;
303 MUSB_DEV_MODE(musb);
304 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
305 portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
306 }
307
308 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
309 drvvbus ? "on" : "off",
310 usb_otg_state_string(musb->xceiv->otg->state),
311 err ? " ERROR" : "",
312 devctl);
313 ret = IRQ_HANDLED;
314 }
315
316 if (musb->int_tx || musb->int_rx || musb->int_usb)
317 ret |= musb_interrupt(musb);
318
319 eoi:
320 /* EOI needs to be written for the IRQ to be re-asserted. */
321 if (ret == IRQ_HANDLED || status)
322 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
323
324 /* Poll for ID change */
325 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE)
326 mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
327
328 spin_unlock_irqrestore(&musb->lock, flags);
329
330 return ret;
331}
332
333static int da8xx_musb_set_mode(struct musb *musb, u8 musb_mode)
334{
335 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
336 enum phy_mode phy_mode;
337
338 switch (musb_mode) {
339 case MUSB_HOST: /* Force VBUS valid, ID = 0 */
340 phy_mode = PHY_MODE_USB_HOST;
341 break;
342 case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
343 phy_mode = PHY_MODE_USB_DEVICE;
344 break;
345 case MUSB_OTG: /* Don't override the VBUS/ID comparators */
346 phy_mode = PHY_MODE_USB_OTG;
347 break;
348 default:
349 return -EINVAL;
350 }
351
352 return phy_set_mode(glue->phy, phy_mode);
353}
354
355static int da8xx_musb_init(struct musb *musb)
356{
357 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
358 void __iomem *reg_base = musb->ctrl_base;
359 u32 rev;
360 int ret = -ENODEV;
361
362 musb->mregs += DA8XX_MENTOR_CORE_OFFSET;
363
364 ret = clk_prepare_enable(glue->clk);
365 if (ret) {
366 dev_err(glue->dev, "failed to enable clock\n");
367 return ret;
368 }
369
370 /* Returns zero if e.g. not clocked */
371 rev = musb_readl(reg_base, DA8XX_USB_REVISION_REG);
372 if (!rev) {
373 ret = -ENODEV;
374 goto fail;
375 }
376
377 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
378 if (IS_ERR_OR_NULL(musb->xceiv)) {
379 ret = -EPROBE_DEFER;
380 goto fail;
381 }
382
383 timer_setup(&musb->dev_timer, otg_timer, 0);
384
385 /* Reset the controller */
386 musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);
387
388 /* Start the on-chip PHY and its PLL. */
389 ret = phy_init(glue->phy);
390 if (ret) {
391 dev_err(glue->dev, "Failed to init phy.\n");
392 goto fail;
393 }
394
395 ret = phy_power_on(glue->phy);
396 if (ret) {
397 dev_err(glue->dev, "Failed to power on phy.\n");
398 goto err_phy_power_on;
399 }
400
401 msleep(5);
402
403 /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
404 pr_debug("DA8xx OTG revision %08x, control %02x\n", rev,
405 musb_readb(reg_base, DA8XX_USB_CTRL_REG));
406
407 musb->isr = da8xx_musb_interrupt;
408 return 0;
409
410err_phy_power_on:
411 phy_exit(glue->phy);
412fail:
413 clk_disable_unprepare(glue->clk);
414 return ret;
415}
416
417static int da8xx_musb_exit(struct musb *musb)
418{
419 struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
420
421 del_timer_sync(&musb->dev_timer);
422
423 phy_power_off(glue->phy);
424 phy_exit(glue->phy);
425 clk_disable_unprepare(glue->clk);
426
427 usb_put_phy(musb->xceiv);
428
429 return 0;
430}
431
432static inline u8 get_vbus_power(struct device *dev)
433{
434 struct regulator *vbus_supply;
435 int current_uA;
436
437 vbus_supply = regulator_get_optional(dev, "vbus");
438 if (IS_ERR(vbus_supply))
439 return 255;
440 current_uA = regulator_get_current_limit(vbus_supply);
441 regulator_put(vbus_supply);
442 if (current_uA <= 0 || current_uA > 510000)
443 return 255;
444 return current_uA / 1000 / 2;
445}
446
447#ifdef CONFIG_USB_TI_CPPI41_DMA
448static void da8xx_dma_controller_callback(struct dma_controller *c)
449{
450 struct musb *musb = c->musb;
451 void __iomem *reg_base = musb->ctrl_base;
452
453 musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0);
454}
455
456static struct dma_controller *
457da8xx_dma_controller_create(struct musb *musb, void __iomem *base)
458{
459 struct dma_controller *controller;
460
461 controller = cppi41_dma_controller_create(musb, base);
462 if (IS_ERR_OR_NULL(controller))
463 return controller;
464
465 controller->dma_callback = da8xx_dma_controller_callback;
466
467 return controller;
468}
469#endif
470
471static const struct musb_platform_ops da8xx_ops = {
472 .quirks = MUSB_INDEXED_EP | MUSB_PRESERVE_SESSION |
473 MUSB_DMA_CPPI41 | MUSB_DA8XX,
474 .init = da8xx_musb_init,
475 .exit = da8xx_musb_exit,
476
477 .fifo_mode = 2,
478#ifdef CONFIG_USB_TI_CPPI41_DMA
479 .dma_init = da8xx_dma_controller_create,
480 .dma_exit = cppi41_dma_controller_destroy,
481#endif
482 .enable = da8xx_musb_enable,
483 .disable = da8xx_musb_disable,
484
485 .set_mode = da8xx_musb_set_mode,
486
487#ifndef CONFIG_USB_MUSB_HOST
488 .try_idle = da8xx_musb_try_idle,
489#endif
490 .recover = da8xx_babble_recover,
491
492 .set_vbus = da8xx_musb_set_vbus,
493};
494
495static const struct platform_device_info da8xx_dev_info = {
496 .name = "musb-hdrc",
497 .id = PLATFORM_DEVID_AUTO,
498 .dma_mask = DMA_BIT_MASK(32),
499};
500
501static const struct musb_hdrc_config da8xx_config = {
502 .ram_bits = 10,
503 .num_eps = 5,
504 .multipoint = 1,
505};
506
507static struct of_dev_auxdata da8xx_auxdata_lookup[] = {
508 OF_DEV_AUXDATA("ti,da830-cppi41", 0x01e01000, "cppi41-dmaengine",
509 NULL),
510 {}
511};
512
513static int da8xx_probe(struct platform_device *pdev)
514{
515 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
516 struct da8xx_glue *glue;
517 struct platform_device_info pinfo;
518 struct clk *clk;
519 struct device_node *np = pdev->dev.of_node;
520 int ret;
521
522 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
523 if (!glue)
524 return -ENOMEM;
525
526 clk = devm_clk_get(&pdev->dev, NULL);
527 if (IS_ERR(clk)) {
528 dev_err(&pdev->dev, "failed to get clock\n");
529 return PTR_ERR(clk);
530 }
531
532 glue->phy = devm_phy_get(&pdev->dev, "usb-phy");
533 if (IS_ERR(glue->phy))
534 return dev_err_probe(&pdev->dev, PTR_ERR(glue->phy),
535 "failed to get phy\n");
536
537 glue->dev = &pdev->dev;
538 glue->clk = clk;
539
540 if (IS_ENABLED(CONFIG_OF) && np) {
541 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
542 if (!pdata)
543 return -ENOMEM;
544
545 pdata->config = &da8xx_config;
546 pdata->mode = musb_get_mode(&pdev->dev);
547 pdata->power = get_vbus_power(&pdev->dev);
548 }
549
550 pdata->platform_ops = &da8xx_ops;
551
552 glue->usb_phy = usb_phy_generic_register();
553 ret = PTR_ERR_OR_ZERO(glue->usb_phy);
554 if (ret) {
555 dev_err(&pdev->dev, "failed to register usb_phy\n");
556 return ret;
557 }
558 platform_set_drvdata(pdev, glue);
559
560 ret = of_platform_populate(pdev->dev.of_node, NULL,
561 da8xx_auxdata_lookup, &pdev->dev);
562 if (ret)
563 goto err_unregister_phy;
564
565 pinfo = da8xx_dev_info;
566 pinfo.parent = &pdev->dev;
567 pinfo.res = pdev->resource;
568 pinfo.num_res = pdev->num_resources;
569 pinfo.data = pdata;
570 pinfo.size_data = sizeof(*pdata);
571 pinfo.fwnode = of_fwnode_handle(np);
572 pinfo.of_node_reused = true;
573
574 glue->musb = platform_device_register_full(&pinfo);
575 ret = PTR_ERR_OR_ZERO(glue->musb);
576 if (ret) {
577 dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
578 goto err_unregister_phy;
579 }
580
581 return 0;
582
583err_unregister_phy:
584 usb_phy_generic_unregister(glue->usb_phy);
585 return ret;
586}
587
588static void da8xx_remove(struct platform_device *pdev)
589{
590 struct da8xx_glue *glue = platform_get_drvdata(pdev);
591
592 platform_device_unregister(glue->musb);
593 usb_phy_generic_unregister(glue->usb_phy);
594}
595
596#ifdef CONFIG_PM_SLEEP
597static int da8xx_suspend(struct device *dev)
598{
599 int ret;
600 struct da8xx_glue *glue = dev_get_drvdata(dev);
601
602 ret = phy_power_off(glue->phy);
603 if (ret)
604 return ret;
605 clk_disable_unprepare(glue->clk);
606
607 return 0;
608}
609
610static int da8xx_resume(struct device *dev)
611{
612 int ret;
613 struct da8xx_glue *glue = dev_get_drvdata(dev);
614
615 ret = clk_prepare_enable(glue->clk);
616 if (ret)
617 return ret;
618 return phy_power_on(glue->phy);
619}
620#endif
621
622static SIMPLE_DEV_PM_OPS(da8xx_pm_ops, da8xx_suspend, da8xx_resume);
623
624#ifdef CONFIG_OF
625static const struct of_device_id da8xx_id_table[] = {
626 {
627 .compatible = "ti,da830-musb",
628 },
629 {},
630};
631MODULE_DEVICE_TABLE(of, da8xx_id_table);
632#endif
633
634static struct platform_driver da8xx_driver = {
635 .probe = da8xx_probe,
636 .remove = da8xx_remove,
637 .driver = {
638 .name = "musb-da8xx",
639 .pm = &da8xx_pm_ops,
640 .of_match_table = of_match_ptr(da8xx_id_table),
641 },
642};
643
644MODULE_DESCRIPTION("DA8xx/OMAP-L1x MUSB Glue Layer");
645MODULE_AUTHOR("Sergei Shtylyov <sshtylyov@ru.mvista.com>");
646MODULE_LICENSE("GPL v2");
647module_platform_driver(da8xx_driver);