Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/drivers/usb/musb/musb_dsps.c

  1 /*
  2  * Texas Instruments DSPS platforms "glue layer"
  3  *
  4  * Copyright (C) 2012, by Texas Instruments
  5  *
  6  * Based on the am35x "glue layer" code.
  7  *
  8  * This file is part of the Inventra Controller Driver for Linux.
  9  *
 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
 13  * Foundation.
 14  *
 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.
 20  *
 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
 25  *
 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.
 30  */
 31 
 32 #include <linux/io.h>
 33 #include <linux/err.h>
 34 #include <linux/platform_device.h>
 35 #include <linux/dma-mapping.h>
 36 #include <linux/pm_runtime.h>
 37 #include <linux/module.h>
 38 #include <linux/usb/usb_phy_generic.h>
 39 #include <linux/platform_data/usb-omap.h>
 40 #include <linux/sizes.h>
 41 
 42 #include <linux/of.h>
 43 #include <linux/of_device.h>
 44 #include <linux/of_address.h>
 45 #include <linux/of_irq.h>
 46 #include <linux/usb/of.h>
 47 
 48 #include <linux/debugfs.h>
 49 
 50 #include "musb_core.h"
 51 
 52 static const struct of_device_id musb_dsps_of_match[];
 53 
 54 /**
 55  * DSPS musb wrapper register offset.
 56  * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
 57  * musb ips.
 58  */
 59 struct dsps_musb_wrapper {
 60         u16     revision;
 61         u16     control;
 62         u16     status;
 63         u16     epintr_set;
 64         u16     epintr_clear;
 65         u16     epintr_status;
 66         u16     coreintr_set;
 67         u16     coreintr_clear;
 68         u16     coreintr_status;
 69         u16     phy_utmi;
 70         u16     mode;
 71         u16     tx_mode;
 72         u16     rx_mode;
 73 
 74         /* bit positions for control */
 75         unsigned        reset:5;
 76 
 77         /* bit positions for interrupt */
 78         unsigned        usb_shift:5;
 79         u32             usb_mask;
 80         u32             usb_bitmap;
 81         unsigned        drvvbus:5;
 82 
 83         unsigned        txep_shift:5;
 84         u32             txep_mask;
 85         u32             txep_bitmap;
 86 
 87         unsigned        rxep_shift:5;
 88         u32             rxep_mask;
 89         u32             rxep_bitmap;
 90 
 91         /* bit positions for phy_utmi */
 92         unsigned        otg_disable:5;
 93 
 94         /* bit positions for mode */
 95         unsigned        iddig:5;
 96         unsigned        iddig_mux:5;
 97         /* miscellaneous stuff */
 98         unsigned        poll_timeout;
 99 };
100 
101 /*
102  * register shadow for suspend
103  */
104 struct dsps_context {
105         u32 control;
106         u32 epintr;
107         u32 coreintr;
108         u32 phy_utmi;
109         u32 mode;
110         u32 tx_mode;
111         u32 rx_mode;
112 };
113 
114 /**
115  * DSPS glue structure.
116  */
117 struct dsps_glue {
118         struct device *dev;
119         struct platform_device *musb;   /* child musb pdev */
120         const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
121         struct timer_list timer;        /* otg_workaround timer */
122         unsigned long last_timer;    /* last timer data for each instance */
123         bool sw_babble_enabled;
124 
125         struct dsps_context context;
126         struct debugfs_regset32 regset;
127         struct dentry *dbgfs_root;
128 };
129 
130 static const struct debugfs_reg32 dsps_musb_regs[] = {
131         { "revision",           0x00 },
132         { "control",            0x14 },
133         { "status",             0x18 },
134         { "eoi",                0x24 },
135         { "intr0_stat",         0x30 },
136         { "intr1_stat",         0x34 },
137         { "intr0_set",          0x38 },
138         { "intr1_set",          0x3c },
139         { "txmode",             0x70 },
140         { "rxmode",             0x74 },
141         { "autoreq",            0xd0 },
142         { "srpfixtime",         0xd4 },
143         { "tdown",              0xd8 },
144         { "phy_utmi",           0xe0 },
145         { "mode",               0xe8 },
146 };
147 
148 /**
149  * dsps_musb_enable - enable interrupts
150  */
151 static void dsps_musb_enable(struct musb *musb)
152 {
153         struct device *dev = musb->controller;
154         struct platform_device *pdev = to_platform_device(dev->parent);
155         struct dsps_glue *glue = platform_get_drvdata(pdev);
156         const struct dsps_musb_wrapper *wrp = glue->wrp;
157         void __iomem *reg_base = musb->ctrl_base;
158         u32 epmask, coremask;
159 
160         /* Workaround: setup IRQs through both register sets. */
161         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
162                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
163         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
164 
165         musb_writel(reg_base, wrp->epintr_set, epmask);
166         musb_writel(reg_base, wrp->coreintr_set, coremask);
167         /* start polling for ID change in dual-role idle mode */
168         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
169                         musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
170                 mod_timer(&glue->timer, jiffies +
171                                 msecs_to_jiffies(wrp->poll_timeout));
172 }
173 
174 /**
175  * dsps_musb_disable - disable HDRC and flush interrupts
176  */
177 static void dsps_musb_disable(struct musb *musb)
178 {
179         struct device *dev = musb->controller;
180         struct platform_device *pdev = to_platform_device(dev->parent);
181         struct dsps_glue *glue = platform_get_drvdata(pdev);
182         const struct dsps_musb_wrapper *wrp = glue->wrp;
183         void __iomem *reg_base = musb->ctrl_base;
184 
185         musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
186         musb_writel(reg_base, wrp->epintr_clear,
187                          wrp->txep_bitmap | wrp->rxep_bitmap);
188         del_timer_sync(&glue->timer);
189         musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
190 }
191 
192 /* Caller must take musb->lock */
193 static int dsps_check_status(struct musb *musb, void *unused)
194 {
195         void __iomem *mregs = musb->mregs;
196         struct device *dev = musb->controller;
197         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
198         const struct dsps_musb_wrapper *wrp = glue->wrp;
199         u8 devctl;
200         int skip_session = 0;
201 
202         /*
203          * We poll because DSPS IP's won't expose several OTG-critical
204          * status change events (from the transceiver) otherwise.
205          */
206         devctl = musb_readb(mregs, MUSB_DEVCTL);
207         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
208                                 usb_otg_state_string(musb->xceiv->otg->state));
209 
210         switch (musb->xceiv->otg->state) {
211         case OTG_STATE_A_WAIT_VRISE:
212                 mod_timer(&glue->timer, jiffies +
213                                 msecs_to_jiffies(wrp->poll_timeout));
214                 break;
215         case OTG_STATE_A_WAIT_BCON:
216                 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
217                 skip_session = 1;
218                 /* fall */
219 
220         case OTG_STATE_A_IDLE:
221         case OTG_STATE_B_IDLE:
222                 if (devctl & MUSB_DEVCTL_BDEVICE) {
223                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
224                         MUSB_DEV_MODE(musb);
225                 } else {
226                         musb->xceiv->otg->state = OTG_STATE_A_IDLE;
227                         MUSB_HST_MODE(musb);
228                 }
229                 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
230                         musb_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
231                 mod_timer(&glue->timer, jiffies +
232                                 msecs_to_jiffies(wrp->poll_timeout));
233                 break;
234         case OTG_STATE_A_WAIT_VFALL:
235                 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
236                 musb_writel(musb->ctrl_base, wrp->coreintr_set,
237                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
238                 break;
239         default:
240                 break;
241         }
242 
243         return 0;
244 }
245 
246 static void otg_timer(unsigned long _musb)
247 {
248         struct musb *musb = (void *)_musb;
249         struct device *dev = musb->controller;
250         unsigned long flags;
251         int err;
252 
253         err = pm_runtime_get(dev);
254         if ((err != -EINPROGRESS) && err < 0) {
255                 dev_err(dev, "Poll could not pm_runtime_get: %i\n", err);
256                 pm_runtime_put_noidle(dev);
257 
258                 return;
259         }
260 
261         spin_lock_irqsave(&musb->lock, flags);
262         err = musb_queue_resume_work(musb, dsps_check_status, NULL);
263         if (err < 0)
264                 dev_err(dev, "%s resume work: %i\n", __func__, err);
265         spin_unlock_irqrestore(&musb->lock, flags);
266         pm_runtime_mark_last_busy(dev);
267         pm_runtime_put_autosuspend(dev);
268 }
269 
270 static irqreturn_t dsps_interrupt(int irq, void *hci)
271 {
272         struct musb  *musb = hci;
273         void __iomem *reg_base = musb->ctrl_base;
274         struct device *dev = musb->controller;
275         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
276         const struct dsps_musb_wrapper *wrp = glue->wrp;
277         unsigned long flags;
278         irqreturn_t ret = IRQ_NONE;
279         u32 epintr, usbintr;
280 
281         spin_lock_irqsave(&musb->lock, flags);
282 
283         /* Get endpoint interrupts */
284         epintr = musb_readl(reg_base, wrp->epintr_status);
285         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
286         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
287 
288         if (epintr)
289                 musb_writel(reg_base, wrp->epintr_status, epintr);
290 
291         /* Get usb core interrupts */
292         usbintr = musb_readl(reg_base, wrp->coreintr_status);
293         if (!usbintr && !epintr)
294                 goto out;
295 
296         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
297         if (usbintr)
298                 musb_writel(reg_base, wrp->coreintr_status, usbintr);
299 
300         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
301                         usbintr, epintr);
302 
303         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
304                 int drvvbus = musb_readl(reg_base, wrp->status);
305                 void __iomem *mregs = musb->mregs;
306                 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
307                 int err;
308 
309                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
310                 if (err) {
311                         /*
312                          * The Mentor core doesn't debounce VBUS as needed
313                          * to cope with device connect current spikes. This
314                          * means it's not uncommon for bus-powered devices
315                          * to get VBUS errors during enumeration.
316                          *
317                          * This is a workaround, but newer RTL from Mentor
318                          * seems to allow a better one: "re"-starting sessions
319                          * without waiting for VBUS to stop registering in
320                          * devctl.
321                          */
322                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
323                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
324                         mod_timer(&glue->timer, jiffies +
325                                         msecs_to_jiffies(wrp->poll_timeout));
326                         WARNING("VBUS error workaround (delay coming)\n");
327                 } else if (drvvbus) {
328                         MUSB_HST_MODE(musb);
329                         musb->xceiv->otg->default_a = 1;
330                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
331                         mod_timer(&glue->timer, jiffies +
332                                   msecs_to_jiffies(wrp->poll_timeout));
333                 } else {
334                         musb->is_active = 0;
335                         MUSB_DEV_MODE(musb);
336                         musb->xceiv->otg->default_a = 0;
337                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
338                 }
339 
340                 /* NOTE: this must complete power-on within 100 ms. */
341                 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
342                                 drvvbus ? "on" : "off",
343                                 usb_otg_state_string(musb->xceiv->otg->state),
344                                 err ? " ERROR" : "",
345                                 devctl);
346                 ret = IRQ_HANDLED;
347         }
348 
349         if (musb->int_tx || musb->int_rx || musb->int_usb)
350                 ret |= musb_interrupt(musb);
351 
352         /* Poll for ID change and connect */
353         switch (musb->xceiv->otg->state) {
354         case OTG_STATE_B_IDLE:
355         case OTG_STATE_A_WAIT_BCON:
356                 mod_timer(&glue->timer, jiffies +
357                                 msecs_to_jiffies(wrp->poll_timeout));
358                 break;
359         default:
360                 break;
361         }
362 
363 out:
364         spin_unlock_irqrestore(&musb->lock, flags);
365 
366         return ret;
367 }
368 
369 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
370 {
371         struct dentry *root;
372         struct dentry *file;
373         char buf[128];
374 
375         sprintf(buf, "%s.dsps", dev_name(musb->controller));
376         root = debugfs_create_dir(buf, NULL);
377         if (!root)
378                 return -ENOMEM;
379         glue->dbgfs_root = root;
380 
381         glue->regset.regs = dsps_musb_regs;
382         glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
383         glue->regset.base = musb->ctrl_base;
384 
385         file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
386         if (!file) {
387                 debugfs_remove_recursive(root);
388                 return -ENOMEM;
389         }
390         return 0;
391 }
392 
393 static int dsps_musb_init(struct musb *musb)
394 {
395         struct device *dev = musb->controller;
396         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
397         struct platform_device *parent = to_platform_device(dev->parent);
398         const struct dsps_musb_wrapper *wrp = glue->wrp;
399         void __iomem *reg_base;
400         struct resource *r;
401         u32 rev, val;
402         int ret;
403 
404         r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
405         reg_base = devm_ioremap_resource(dev, r);
406         if (IS_ERR(reg_base))
407                 return PTR_ERR(reg_base);
408         musb->ctrl_base = reg_base;
409 
410         /* NOP driver needs change if supporting dual instance */
411         musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
412         if (IS_ERR(musb->xceiv))
413                 return PTR_ERR(musb->xceiv);
414 
415         musb->phy = devm_phy_get(dev->parent, "usb2-phy");
416 
417         /* Returns zero if e.g. not clocked */
418         rev = musb_readl(reg_base, wrp->revision);
419         if (!rev)
420                 return -ENODEV;
421 
422         usb_phy_init(musb->xceiv);
423         if (IS_ERR(musb->phy))  {
424                 musb->phy = NULL;
425         } else {
426                 ret = phy_init(musb->phy);
427                 if (ret < 0)
428                         return ret;
429                 ret = phy_power_on(musb->phy);
430                 if (ret) {
431                         phy_exit(musb->phy);
432                         return ret;
433                 }
434         }
435 
436         setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
437 
438         /* Reset the musb */
439         musb_writel(reg_base, wrp->control, (1 << wrp->reset));
440 
441         musb->isr = dsps_interrupt;
442 
443         /* reset the otgdisable bit, needed for host mode to work */
444         val = musb_readl(reg_base, wrp->phy_utmi);
445         val &= ~(1 << wrp->otg_disable);
446         musb_writel(musb->ctrl_base, wrp->phy_utmi, val);
447 
448         /*
449          *  Check whether the dsps version has babble control enabled.
450          * In latest silicon revision the babble control logic is enabled.
451          * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
452          * logic enabled.
453          */
454         val = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
455         if (val & MUSB_BABBLE_RCV_DISABLE) {
456                 glue->sw_babble_enabled = true;
457                 val |= MUSB_BABBLE_SW_SESSION_CTRL;
458                 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
459         }
460 
461         mod_timer(&glue->timer, jiffies +
462                   msecs_to_jiffies(glue->wrp->poll_timeout));
463 
464         return dsps_musb_dbg_init(musb, glue);
465 }
466 
467 static int dsps_musb_exit(struct musb *musb)
468 {
469         struct device *dev = musb->controller;
470         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
471 
472         del_timer_sync(&glue->timer);
473         usb_phy_shutdown(musb->xceiv);
474         phy_power_off(musb->phy);
475         phy_exit(musb->phy);
476         debugfs_remove_recursive(glue->dbgfs_root);
477 
478         return 0;
479 }
480 
481 static int dsps_musb_set_mode(struct musb *musb, u8 mode)
482 {
483         struct device *dev = musb->controller;
484         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
485         const struct dsps_musb_wrapper *wrp = glue->wrp;
486         void __iomem *ctrl_base = musb->ctrl_base;
487         u32 reg;
488 
489         reg = musb_readl(ctrl_base, wrp->mode);
490 
491         switch (mode) {
492         case MUSB_HOST:
493                 reg &= ~(1 << wrp->iddig);
494 
495                 /*
496                  * if we're setting mode to host-only or device-only, we're
497                  * going to ignore whatever the PHY sends us and just force
498                  * ID pin status by SW
499                  */
500                 reg |= (1 << wrp->iddig_mux);
501 
502                 musb_writel(ctrl_base, wrp->mode, reg);
503                 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
504                 break;
505         case MUSB_PERIPHERAL:
506                 reg |= (1 << wrp->iddig);
507 
508                 /*
509                  * if we're setting mode to host-only or device-only, we're
510                  * going to ignore whatever the PHY sends us and just force
511                  * ID pin status by SW
512                  */
513                 reg |= (1 << wrp->iddig_mux);
514 
515                 musb_writel(ctrl_base, wrp->mode, reg);
516                 break;
517         case MUSB_OTG:
518                 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
519                 break;
520         default:
521                 dev_err(glue->dev, "unsupported mode %d\n", mode);
522                 return -EINVAL;
523         }
524 
525         return 0;
526 }
527 
528 static bool dsps_sw_babble_control(struct musb *musb)
529 {
530         u8 babble_ctl;
531         bool session_restart =  false;
532 
533         babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
534         dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
535                 babble_ctl);
536         /*
537          * check line monitor flag to check whether babble is
538          * due to noise
539          */
540         dev_dbg(musb->controller, "STUCK_J is %s\n",
541                 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
542 
543         if (babble_ctl & MUSB_BABBLE_STUCK_J) {
544                 int timeout = 10;
545 
546                 /*
547                  * babble is due to noise, then set transmit idle (d7 bit)
548                  * to resume normal operation
549                  */
550                 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
551                 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
552                 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
553 
554                 /* wait till line monitor flag cleared */
555                 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
556                 do {
557                         babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
558                         udelay(1);
559                 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
560 
561                 /* check whether stuck_at_j bit cleared */
562                 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
563                         /*
564                          * real babble condition has occurred
565                          * restart the controller to start the
566                          * session again
567                          */
568                         dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
569                                 babble_ctl);
570                         session_restart = true;
571                 }
572         } else {
573                 session_restart = true;
574         }
575 
576         return session_restart;
577 }
578 
579 static int dsps_musb_recover(struct musb *musb)
580 {
581         struct device *dev = musb->controller;
582         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
583         int session_restart = 0;
584 
585         if (glue->sw_babble_enabled)
586                 session_restart = dsps_sw_babble_control(musb);
587         else
588                 session_restart = 1;
589 
590         return session_restart ? 0 : -EPIPE;
591 }
592 
593 /* Similar to am35x, dm81xx support only 32-bit read operation */
594 static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
595 {
596         void __iomem *fifo = hw_ep->fifo;
597 
598         if (len >= 4) {
599                 ioread32_rep(fifo, dst, len >> 2);
600                 dst += len & ~0x03;
601                 len &= 0x03;
602         }
603 
604         /* Read any remaining 1 to 3 bytes */
605         if (len > 0) {
606                 u32 val = musb_readl(fifo, 0);
607                 memcpy(dst, &val, len);
608         }
609 }
610 
611 static struct musb_platform_ops dsps_ops = {
612         .quirks         = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
613         .init           = dsps_musb_init,
614         .exit           = dsps_musb_exit,
615 
616 #ifdef CONFIG_USB_TI_CPPI41_DMA
617         .dma_init       = cppi41_dma_controller_create,
618         .dma_exit       = cppi41_dma_controller_destroy,
619 #endif
620         .enable         = dsps_musb_enable,
621         .disable        = dsps_musb_disable,
622 
623         .set_mode       = dsps_musb_set_mode,
624         .recover        = dsps_musb_recover,
625 };
626 
627 static u64 musb_dmamask = DMA_BIT_MASK(32);
628 
629 static int get_int_prop(struct device_node *dn, const char *s)
630 {
631         int ret;
632         u32 val;
633 
634         ret = of_property_read_u32(dn, s, &val);
635         if (ret)
636                 return 0;
637         return val;
638 }
639 
640 static int get_musb_port_mode(struct device *dev)
641 {
642         enum usb_dr_mode mode;
643 
644         mode = usb_get_dr_mode(dev);
645         switch (mode) {
646         case USB_DR_MODE_HOST:
647                 return MUSB_PORT_MODE_HOST;
648 
649         case USB_DR_MODE_PERIPHERAL:
650                 return MUSB_PORT_MODE_GADGET;
651 
652         case USB_DR_MODE_UNKNOWN:
653         case USB_DR_MODE_OTG:
654         default:
655                 return MUSB_PORT_MODE_DUAL_ROLE;
656         }
657 }
658 
659 static int dsps_create_musb_pdev(struct dsps_glue *glue,
660                 struct platform_device *parent)
661 {
662         struct musb_hdrc_platform_data pdata;
663         struct resource resources[2];
664         struct resource *res;
665         struct device *dev = &parent->dev;
666         struct musb_hdrc_config *config;
667         struct platform_device *musb;
668         struct device_node *dn = parent->dev.of_node;
669         int ret, val;
670 
671         memset(resources, 0, sizeof(resources));
672         res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
673         if (!res) {
674                 dev_err(dev, "failed to get memory.\n");
675                 return -EINVAL;
676         }
677         resources[0] = *res;
678 
679         res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
680         if (!res) {
681                 dev_err(dev, "failed to get irq.\n");
682                 return -EINVAL;
683         }
684         resources[1] = *res;
685 
686         /* allocate the child platform device */
687         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
688         if (!musb) {
689                 dev_err(dev, "failed to allocate musb device\n");
690                 return -ENOMEM;
691         }
692 
693         musb->dev.parent                = dev;
694         musb->dev.dma_mask              = &musb_dmamask;
695         musb->dev.coherent_dma_mask     = musb_dmamask;
696 
697         glue->musb = musb;
698 
699         ret = platform_device_add_resources(musb, resources,
700                         ARRAY_SIZE(resources));
701         if (ret) {
702                 dev_err(dev, "failed to add resources\n");
703                 goto err;
704         }
705 
706         config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
707         if (!config) {
708                 ret = -ENOMEM;
709                 goto err;
710         }
711         pdata.config = config;
712         pdata.platform_ops = &dsps_ops;
713 
714         config->num_eps = get_int_prop(dn, "mentor,num-eps");
715         config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
716         config->host_port_deassert_reset_at_resume = 1;
717         pdata.mode = get_musb_port_mode(dev);
718         /* DT keeps this entry in mA, musb expects it as per USB spec */
719         pdata.power = get_int_prop(dn, "mentor,power") / 2;
720 
721         ret = of_property_read_u32(dn, "mentor,multipoint", &val);
722         if (!ret && val)
723                 config->multipoint = true;
724 
725         config->maximum_speed = usb_get_maximum_speed(&parent->dev);
726         switch (config->maximum_speed) {
727         case USB_SPEED_LOW:
728         case USB_SPEED_FULL:
729                 break;
730         case USB_SPEED_SUPER:
731                 dev_warn(dev, "ignore incorrect maximum_speed "
732                                 "(super-speed) setting in dts");
733                 /* fall through */
734         default:
735                 config->maximum_speed = USB_SPEED_HIGH;
736         }
737 
738         ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
739         if (ret) {
740                 dev_err(dev, "failed to add platform_data\n");
741                 goto err;
742         }
743 
744         ret = platform_device_add(musb);
745         if (ret) {
746                 dev_err(dev, "failed to register musb device\n");
747                 goto err;
748         }
749         return 0;
750 
751 err:
752         platform_device_put(musb);
753         return ret;
754 }
755 
756 static int dsps_probe(struct platform_device *pdev)
757 {
758         const struct of_device_id *match;
759         const struct dsps_musb_wrapper *wrp;
760         struct dsps_glue *glue;
761         int ret;
762 
763         if (!strcmp(pdev->name, "musb-hdrc"))
764                 return -ENODEV;
765 
766         match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
767         if (!match) {
768                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
769                 return -EINVAL;
770         }
771         wrp = match->data;
772 
773         if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
774                 dsps_ops.read_fifo = dsps_read_fifo32;
775 
776         /* allocate glue */
777         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
778         if (!glue)
779                 return -ENOMEM;
780 
781         glue->dev = &pdev->dev;
782         glue->wrp = wrp;
783 
784         platform_set_drvdata(pdev, glue);
785         pm_runtime_enable(&pdev->dev);
786         ret = dsps_create_musb_pdev(glue, pdev);
787         if (ret)
788                 goto err;
789 
790         return 0;
791 
792 err:
793         pm_runtime_disable(&pdev->dev);
794         return ret;
795 }
796 
797 static int dsps_remove(struct platform_device *pdev)
798 {
799         struct dsps_glue *glue = platform_get_drvdata(pdev);
800 
801         platform_device_unregister(glue->musb);
802 
803         pm_runtime_disable(&pdev->dev);
804 
805         return 0;
806 }
807 
808 static const struct dsps_musb_wrapper am33xx_driver_data = {
809         .revision               = 0x00,
810         .control                = 0x14,
811         .status                 = 0x18,
812         .epintr_set             = 0x38,
813         .epintr_clear           = 0x40,
814         .epintr_status          = 0x30,
815         .coreintr_set           = 0x3c,
816         .coreintr_clear         = 0x44,
817         .coreintr_status        = 0x34,
818         .phy_utmi               = 0xe0,
819         .mode                   = 0xe8,
820         .tx_mode                = 0x70,
821         .rx_mode                = 0x74,
822         .reset                  = 0,
823         .otg_disable            = 21,
824         .iddig                  = 8,
825         .iddig_mux              = 7,
826         .usb_shift              = 0,
827         .usb_mask               = 0x1ff,
828         .usb_bitmap             = (0x1ff << 0),
829         .drvvbus                = 8,
830         .txep_shift             = 0,
831         .txep_mask              = 0xffff,
832         .txep_bitmap            = (0xffff << 0),
833         .rxep_shift             = 16,
834         .rxep_mask              = 0xfffe,
835         .rxep_bitmap            = (0xfffe << 16),
836         .poll_timeout           = 2000, /* ms */
837 };
838 
839 static const struct of_device_id musb_dsps_of_match[] = {
840         { .compatible = "ti,musb-am33xx",
841                 .data = &am33xx_driver_data, },
842         { .compatible = "ti,musb-dm816",
843                 .data = &am33xx_driver_data, },
844         {  },
845 };
846 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
847 
848 #ifdef CONFIG_PM_SLEEP
849 static int dsps_suspend(struct device *dev)
850 {
851         struct dsps_glue *glue = dev_get_drvdata(dev);
852         const struct dsps_musb_wrapper *wrp = glue->wrp;
853         struct musb *musb = platform_get_drvdata(glue->musb);
854         void __iomem *mbase;
855 
856         del_timer_sync(&glue->timer);
857 
858         if (!musb)
859                 /* This can happen if the musb device is in -EPROBE_DEFER */
860                 return 0;
861 
862         mbase = musb->ctrl_base;
863         glue->context.control = musb_readl(mbase, wrp->control);
864         glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
865         glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set);
866         glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi);
867         glue->context.mode = musb_readl(mbase, wrp->mode);
868         glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
869         glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
870 
871         return 0;
872 }
873 
874 static int dsps_resume(struct device *dev)
875 {
876         struct dsps_glue *glue = dev_get_drvdata(dev);
877         const struct dsps_musb_wrapper *wrp = glue->wrp;
878         struct musb *musb = platform_get_drvdata(glue->musb);
879         void __iomem *mbase;
880 
881         if (!musb)
882                 return 0;
883 
884         mbase = musb->ctrl_base;
885         musb_writel(mbase, wrp->control, glue->context.control);
886         musb_writel(mbase, wrp->epintr_set, glue->context.epintr);
887         musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
888         musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
889         musb_writel(mbase, wrp->mode, glue->context.mode);
890         musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
891         musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
892         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
893             musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
894                 mod_timer(&glue->timer, jiffies +
895                                 msecs_to_jiffies(wrp->poll_timeout));
896 
897         return 0;
898 }
899 #endif
900 
901 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
902 
903 static struct platform_driver dsps_usbss_driver = {
904         .probe          = dsps_probe,
905         .remove         = dsps_remove,
906         .driver         = {
907                 .name   = "musb-dsps",
908                 .pm     = &dsps_pm_ops,
909                 .of_match_table = musb_dsps_of_match,
910         },
911 };
912 
913 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
914 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
915 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
916 MODULE_LICENSE("GPL v2");
917 
918 module_platform_driver(dsps_usbss_driver);
919 

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