Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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  * avoid using musb_readx()/musb_writex() as glue layer should not be
 56  * dependent on musb core layer symbols.
 57  */
 58 static inline u8 dsps_readb(const void __iomem *addr, unsigned offset)
 59 {
 60         return __raw_readb(addr + offset);
 61 }
 62 
 63 static inline u32 dsps_readl(const void __iomem *addr, unsigned offset)
 64 {
 65         return __raw_readl(addr + offset);
 66 }
 67 
 68 static inline void dsps_writeb(void __iomem *addr, unsigned offset, u8 data)
 69 {
 70         __raw_writeb(data, addr + offset);
 71 }
 72 
 73 static inline void dsps_writel(void __iomem *addr, unsigned offset, u32 data)
 74 {
 75         __raw_writel(data, addr + offset);
 76 }
 77 
 78 /**
 79  * DSPS musb wrapper register offset.
 80  * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
 81  * musb ips.
 82  */
 83 struct dsps_musb_wrapper {
 84         u16     revision;
 85         u16     control;
 86         u16     status;
 87         u16     epintr_set;
 88         u16     epintr_clear;
 89         u16     epintr_status;
 90         u16     coreintr_set;
 91         u16     coreintr_clear;
 92         u16     coreintr_status;
 93         u16     phy_utmi;
 94         u16     mode;
 95         u16     tx_mode;
 96         u16     rx_mode;
 97 
 98         /* bit positions for control */
 99         unsigned        reset:5;
100 
101         /* bit positions for interrupt */
102         unsigned        usb_shift:5;
103         u32             usb_mask;
104         u32             usb_bitmap;
105         unsigned        drvvbus:5;
106 
107         unsigned        txep_shift:5;
108         u32             txep_mask;
109         u32             txep_bitmap;
110 
111         unsigned        rxep_shift:5;
112         u32             rxep_mask;
113         u32             rxep_bitmap;
114 
115         /* bit positions for phy_utmi */
116         unsigned        otg_disable:5;
117 
118         /* bit positions for mode */
119         unsigned        iddig:5;
120         unsigned        iddig_mux:5;
121         /* miscellaneous stuff */
122         u8              poll_seconds;
123 };
124 
125 /*
126  * register shadow for suspend
127  */
128 struct dsps_context {
129         u32 control;
130         u32 epintr;
131         u32 coreintr;
132         u32 phy_utmi;
133         u32 mode;
134         u32 tx_mode;
135         u32 rx_mode;
136 };
137 
138 /**
139  * DSPS glue structure.
140  */
141 struct dsps_glue {
142         struct device *dev;
143         struct platform_device *musb;   /* child musb pdev */
144         const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
145         struct timer_list timer;        /* otg_workaround timer */
146         unsigned long last_timer;    /* last timer data for each instance */
147         bool sw_babble_enabled;
148 
149         struct dsps_context context;
150         struct debugfs_regset32 regset;
151         struct dentry *dbgfs_root;
152 };
153 
154 static const struct debugfs_reg32 dsps_musb_regs[] = {
155         { "revision",           0x00 },
156         { "control",            0x14 },
157         { "status",             0x18 },
158         { "eoi",                0x24 },
159         { "intr0_stat",         0x30 },
160         { "intr1_stat",         0x34 },
161         { "intr0_set",          0x38 },
162         { "intr1_set",          0x3c },
163         { "txmode",             0x70 },
164         { "rxmode",             0x74 },
165         { "autoreq",            0xd0 },
166         { "srpfixtime",         0xd4 },
167         { "tdown",              0xd8 },
168         { "phy_utmi",           0xe0 },
169         { "mode",               0xe8 },
170 };
171 
172 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
173 {
174         struct device *dev = musb->controller;
175         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
176 
177         if (timeout == 0)
178                 timeout = jiffies + msecs_to_jiffies(3);
179 
180         /* Never idle if active, or when VBUS timeout is not set as host */
181         if (musb->is_active || (musb->a_wait_bcon == 0 &&
182                                 musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) {
183                 dev_dbg(musb->controller, "%s active, deleting timer\n",
184                                 usb_otg_state_string(musb->xceiv->state));
185                 del_timer(&glue->timer);
186                 glue->last_timer = jiffies;
187                 return;
188         }
189         if (musb->port_mode != MUSB_PORT_MODE_DUAL_ROLE)
190                 return;
191 
192         if (!musb->g.dev.driver)
193                 return;
194 
195         if (time_after(glue->last_timer, timeout) &&
196                                 timer_pending(&glue->timer)) {
197                 dev_dbg(musb->controller,
198                         "Longer idle timer already pending, ignoring...\n");
199                 return;
200         }
201         glue->last_timer = timeout;
202 
203         dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
204                 usb_otg_state_string(musb->xceiv->state),
205                         jiffies_to_msecs(timeout - jiffies));
206         mod_timer(&glue->timer, timeout);
207 }
208 
209 /**
210  * dsps_musb_enable - enable interrupts
211  */
212 static void dsps_musb_enable(struct musb *musb)
213 {
214         struct device *dev = musb->controller;
215         struct platform_device *pdev = to_platform_device(dev->parent);
216         struct dsps_glue *glue = platform_get_drvdata(pdev);
217         const struct dsps_musb_wrapper *wrp = glue->wrp;
218         void __iomem *reg_base = musb->ctrl_base;
219         u32 epmask, coremask;
220 
221         /* Workaround: setup IRQs through both register sets. */
222         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
223                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
224         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
225 
226         dsps_writel(reg_base, wrp->epintr_set, epmask);
227         dsps_writel(reg_base, wrp->coreintr_set, coremask);
228         /* Force the DRVVBUS IRQ so we can start polling for ID change. */
229         dsps_writel(reg_base, wrp->coreintr_set,
230                     (1 << wrp->drvvbus) << wrp->usb_shift);
231         dsps_musb_try_idle(musb, 0);
232 }
233 
234 /**
235  * dsps_musb_disable - disable HDRC and flush interrupts
236  */
237 static void dsps_musb_disable(struct musb *musb)
238 {
239         struct device *dev = musb->controller;
240         struct platform_device *pdev = to_platform_device(dev->parent);
241         struct dsps_glue *glue = platform_get_drvdata(pdev);
242         const struct dsps_musb_wrapper *wrp = glue->wrp;
243         void __iomem *reg_base = musb->ctrl_base;
244 
245         dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
246         dsps_writel(reg_base, wrp->epintr_clear,
247                          wrp->txep_bitmap | wrp->rxep_bitmap);
248         dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
249 }
250 
251 static void otg_timer(unsigned long _musb)
252 {
253         struct musb *musb = (void *)_musb;
254         void __iomem *mregs = musb->mregs;
255         struct device *dev = musb->controller;
256         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
257         const struct dsps_musb_wrapper *wrp = glue->wrp;
258         u8 devctl;
259         unsigned long flags;
260         int skip_session = 0;
261 
262         /*
263          * We poll because DSPS IP's won't expose several OTG-critical
264          * status change events (from the transceiver) otherwise.
265          */
266         devctl = dsps_readb(mregs, MUSB_DEVCTL);
267         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
268                                 usb_otg_state_string(musb->xceiv->state));
269 
270         spin_lock_irqsave(&musb->lock, flags);
271         switch (musb->xceiv->state) {
272         case OTG_STATE_A_WAIT_BCON:
273                 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
274                 skip_session = 1;
275                 /* fall */
276 
277         case OTG_STATE_A_IDLE:
278         case OTG_STATE_B_IDLE:
279                 if (devctl & MUSB_DEVCTL_BDEVICE) {
280                         musb->xceiv->state = OTG_STATE_B_IDLE;
281                         MUSB_DEV_MODE(musb);
282                 } else {
283                         musb->xceiv->state = OTG_STATE_A_IDLE;
284                         MUSB_HST_MODE(musb);
285                 }
286                 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
287                         dsps_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
288                 mod_timer(&glue->timer, jiffies + wrp->poll_seconds * HZ);
289                 break;
290         case OTG_STATE_A_WAIT_VFALL:
291                 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
292                 dsps_writel(musb->ctrl_base, wrp->coreintr_set,
293                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
294                 break;
295         default:
296                 break;
297         }
298         spin_unlock_irqrestore(&musb->lock, flags);
299 }
300 
301 static irqreturn_t dsps_interrupt(int irq, void *hci)
302 {
303         struct musb  *musb = hci;
304         void __iomem *reg_base = musb->ctrl_base;
305         struct device *dev = musb->controller;
306         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
307         const struct dsps_musb_wrapper *wrp = glue->wrp;
308         unsigned long flags;
309         irqreturn_t ret = IRQ_NONE;
310         u32 epintr, usbintr;
311 
312         spin_lock_irqsave(&musb->lock, flags);
313 
314         /* Get endpoint interrupts */
315         epintr = dsps_readl(reg_base, wrp->epintr_status);
316         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
317         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
318 
319         if (epintr)
320                 dsps_writel(reg_base, wrp->epintr_status, epintr);
321 
322         /* Get usb core interrupts */
323         usbintr = dsps_readl(reg_base, wrp->coreintr_status);
324         if (!usbintr && !epintr)
325                 goto out;
326 
327         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
328         if (usbintr)
329                 dsps_writel(reg_base, wrp->coreintr_status, usbintr);
330 
331         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
332                         usbintr, epintr);
333         /*
334          * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
335          * DSPS IP's missing ID change IRQ.  We need an ID change IRQ to
336          * switch appropriately between halves of the OTG state machine.
337          * Managing DEVCTL.SESSION per Mentor docs requires that we know its
338          * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
339          * Also, DRVVBUS pulses for SRP (but not at 5V) ...
340          */
341         if (is_host_active(musb) && usbintr & MUSB_INTR_BABBLE) {
342                 pr_info("CAUTION: musb: Babble Interrupt Occurred\n");
343 
344                 /*
345                  * When a babble condition occurs, the musb controller removes
346                  * the session and is no longer in host mode. Hence, all
347                  * devices connected to its root hub get disconnected.
348                  *
349                  * Hand this error down to the musb core isr, so it can
350                  * recover.
351                  */
352                 musb->int_usb = MUSB_INTR_BABBLE | MUSB_INTR_DISCONNECT;
353                 musb->int_tx = musb->int_rx = 0;
354         }
355 
356         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
357                 int drvvbus = dsps_readl(reg_base, wrp->status);
358                 void __iomem *mregs = musb->mregs;
359                 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL);
360                 int err;
361 
362                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
363                 if (err) {
364                         /*
365                          * The Mentor core doesn't debounce VBUS as needed
366                          * to cope with device connect current spikes. This
367                          * means it's not uncommon for bus-powered devices
368                          * to get VBUS errors during enumeration.
369                          *
370                          * This is a workaround, but newer RTL from Mentor
371                          * seems to allow a better one: "re"-starting sessions
372                          * without waiting for VBUS to stop registering in
373                          * devctl.
374                          */
375                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
376                         musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
377                         mod_timer(&glue->timer,
378                                         jiffies + wrp->poll_seconds * HZ);
379                         WARNING("VBUS error workaround (delay coming)\n");
380                 } else if (drvvbus) {
381                         MUSB_HST_MODE(musb);
382                         musb->xceiv->otg->default_a = 1;
383                         musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
384                         del_timer(&glue->timer);
385                 } else {
386                         musb->is_active = 0;
387                         MUSB_DEV_MODE(musb);
388                         musb->xceiv->otg->default_a = 0;
389                         musb->xceiv->state = OTG_STATE_B_IDLE;
390                 }
391 
392                 /* NOTE: this must complete power-on within 100 ms. */
393                 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
394                                 drvvbus ? "on" : "off",
395                                 usb_otg_state_string(musb->xceiv->state),
396                                 err ? " ERROR" : "",
397                                 devctl);
398                 ret = IRQ_HANDLED;
399         }
400 
401         if (musb->int_tx || musb->int_rx || musb->int_usb)
402                 ret |= musb_interrupt(musb);
403 
404         /* Poll for ID change in OTG port mode */
405         if (musb->xceiv->state == OTG_STATE_B_IDLE &&
406                         musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
407                 mod_timer(&glue->timer, jiffies + wrp->poll_seconds * HZ);
408 out:
409         spin_unlock_irqrestore(&musb->lock, flags);
410 
411         return ret;
412 }
413 
414 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
415 {
416         struct dentry *root;
417         struct dentry *file;
418         char buf[128];
419 
420         sprintf(buf, "%s.dsps", dev_name(musb->controller));
421         root = debugfs_create_dir(buf, NULL);
422         if (!root)
423                 return -ENOMEM;
424         glue->dbgfs_root = root;
425 
426         glue->regset.regs = dsps_musb_regs;
427         glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
428         glue->regset.base = musb->ctrl_base;
429 
430         file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
431         if (!file) {
432                 debugfs_remove_recursive(root);
433                 return -ENOMEM;
434         }
435         return 0;
436 }
437 
438 static int dsps_musb_init(struct musb *musb)
439 {
440         struct device *dev = musb->controller;
441         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
442         struct platform_device *parent = to_platform_device(dev->parent);
443         const struct dsps_musb_wrapper *wrp = glue->wrp;
444         void __iomem *reg_base;
445         struct resource *r;
446         u32 rev, val;
447         int ret;
448 
449         r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
450         if (!r)
451                 return -EINVAL;
452 
453         reg_base = devm_ioremap_resource(dev, r);
454         if (IS_ERR(reg_base))
455                 return PTR_ERR(reg_base);
456         musb->ctrl_base = reg_base;
457 
458         /* NOP driver needs change if supporting dual instance */
459         musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0);
460         if (IS_ERR(musb->xceiv))
461                 return PTR_ERR(musb->xceiv);
462 
463         /* Returns zero if e.g. not clocked */
464         rev = dsps_readl(reg_base, wrp->revision);
465         if (!rev)
466                 return -ENODEV;
467 
468         usb_phy_init(musb->xceiv);
469         setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
470 
471         /* Reset the musb */
472         dsps_writel(reg_base, wrp->control, (1 << wrp->reset));
473 
474         musb->isr = dsps_interrupt;
475 
476         /* reset the otgdisable bit, needed for host mode to work */
477         val = dsps_readl(reg_base, wrp->phy_utmi);
478         val &= ~(1 << wrp->otg_disable);
479         dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
480 
481         /*
482          *  Check whether the dsps version has babble control enabled.
483          * In latest silicon revision the babble control logic is enabled.
484          * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
485          * logic enabled.
486          */
487         val = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
488         if (val == MUSB_BABBLE_RCV_DISABLE) {
489                 glue->sw_babble_enabled = true;
490                 val |= MUSB_BABBLE_SW_SESSION_CTRL;
491                 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
492         }
493 
494         ret = dsps_musb_dbg_init(musb, glue);
495         if (ret)
496                 return ret;
497 
498         return 0;
499 }
500 
501 static int dsps_musb_exit(struct musb *musb)
502 {
503         struct device *dev = musb->controller;
504         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
505 
506         del_timer_sync(&glue->timer);
507         usb_phy_shutdown(musb->xceiv);
508         debugfs_remove_recursive(glue->dbgfs_root);
509 
510         return 0;
511 }
512 
513 static int dsps_musb_set_mode(struct musb *musb, u8 mode)
514 {
515         struct device *dev = musb->controller;
516         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
517         const struct dsps_musb_wrapper *wrp = glue->wrp;
518         void __iomem *ctrl_base = musb->ctrl_base;
519         u32 reg;
520 
521         reg = dsps_readl(ctrl_base, wrp->mode);
522 
523         switch (mode) {
524         case MUSB_HOST:
525                 reg &= ~(1 << wrp->iddig);
526 
527                 /*
528                  * if we're setting mode to host-only or device-only, we're
529                  * going to ignore whatever the PHY sends us and just force
530                  * ID pin status by SW
531                  */
532                 reg |= (1 << wrp->iddig_mux);
533 
534                 dsps_writel(ctrl_base, wrp->mode, reg);
535                 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02);
536                 break;
537         case MUSB_PERIPHERAL:
538                 reg |= (1 << wrp->iddig);
539 
540                 /*
541                  * if we're setting mode to host-only or device-only, we're
542                  * going to ignore whatever the PHY sends us and just force
543                  * ID pin status by SW
544                  */
545                 reg |= (1 << wrp->iddig_mux);
546 
547                 dsps_writel(ctrl_base, wrp->mode, reg);
548                 break;
549         case MUSB_OTG:
550                 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02);
551                 break;
552         default:
553                 dev_err(glue->dev, "unsupported mode %d\n", mode);
554                 return -EINVAL;
555         }
556 
557         return 0;
558 }
559 
560 static bool  sw_babble_control(struct musb *musb)
561 {
562         u8 babble_ctl;
563         bool session_restart =  false;
564 
565         babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
566         dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
567                 babble_ctl);
568         /*
569          * check line monitor flag to check whether babble is
570          * due to noise
571          */
572         dev_dbg(musb->controller, "STUCK_J is %s\n",
573                 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
574 
575         if (babble_ctl & MUSB_BABBLE_STUCK_J) {
576                 int timeout = 10;
577 
578                 /*
579                  * babble is due to noise, then set transmit idle (d7 bit)
580                  * to resume normal operation
581                  */
582                 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
583                 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
584                 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
585 
586                 /* wait till line monitor flag cleared */
587                 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
588                 do {
589                         babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
590                         udelay(1);
591                 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
592 
593                 /* check whether stuck_at_j bit cleared */
594                 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
595                         /*
596                          * real babble condition has occurred
597                          * restart the controller to start the
598                          * session again
599                          */
600                         dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
601                                 babble_ctl);
602                         session_restart = true;
603                 }
604         } else {
605                 session_restart = true;
606         }
607 
608         return session_restart;
609 }
610 
611 static int dsps_musb_reset(struct musb *musb)
612 {
613         struct device *dev = musb->controller;
614         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
615         const struct dsps_musb_wrapper *wrp = glue->wrp;
616         int session_restart = 0;
617 
618         if (glue->sw_babble_enabled)
619                 session_restart = sw_babble_control(musb);
620         /*
621          * In case of new silicon version babble condition can be recovered
622          * without resetting the MUSB. But for older silicon versions, MUSB
623          * reset is needed
624          */
625         if (session_restart || !glue->sw_babble_enabled) {
626                 dev_info(musb->controller, "Restarting MUSB to recover from Babble\n");
627                 dsps_writel(musb->ctrl_base, wrp->control, (1 << wrp->reset));
628                 usleep_range(100, 200);
629                 usb_phy_shutdown(musb->xceiv);
630                 usleep_range(100, 200);
631                 usb_phy_init(musb->xceiv);
632                 session_restart = 1;
633         }
634 
635         return !session_restart;
636 }
637 
638 static struct musb_platform_ops dsps_ops = {
639         .init           = dsps_musb_init,
640         .exit           = dsps_musb_exit,
641 
642         .enable         = dsps_musb_enable,
643         .disable        = dsps_musb_disable,
644 
645         .try_idle       = dsps_musb_try_idle,
646         .set_mode       = dsps_musb_set_mode,
647         .reset          = dsps_musb_reset,
648 };
649 
650 static u64 musb_dmamask = DMA_BIT_MASK(32);
651 
652 static int get_int_prop(struct device_node *dn, const char *s)
653 {
654         int ret;
655         u32 val;
656 
657         ret = of_property_read_u32(dn, s, &val);
658         if (ret)
659                 return 0;
660         return val;
661 }
662 
663 static int get_musb_port_mode(struct device *dev)
664 {
665         enum usb_dr_mode mode;
666 
667         mode = of_usb_get_dr_mode(dev->of_node);
668         switch (mode) {
669         case USB_DR_MODE_HOST:
670                 return MUSB_PORT_MODE_HOST;
671 
672         case USB_DR_MODE_PERIPHERAL:
673                 return MUSB_PORT_MODE_GADGET;
674 
675         case USB_DR_MODE_UNKNOWN:
676         case USB_DR_MODE_OTG:
677         default:
678                 return MUSB_PORT_MODE_DUAL_ROLE;
679         }
680 }
681 
682 static int dsps_create_musb_pdev(struct dsps_glue *glue,
683                 struct platform_device *parent)
684 {
685         struct musb_hdrc_platform_data pdata;
686         struct resource resources[2];
687         struct resource *res;
688         struct device *dev = &parent->dev;
689         struct musb_hdrc_config *config;
690         struct platform_device *musb;
691         struct device_node *dn = parent->dev.of_node;
692         int ret;
693 
694         memset(resources, 0, sizeof(resources));
695         res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
696         if (!res) {
697                 dev_err(dev, "failed to get memory.\n");
698                 return -EINVAL;
699         }
700         resources[0] = *res;
701 
702         res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
703         if (!res) {
704                 dev_err(dev, "failed to get irq.\n");
705                 return -EINVAL;
706         }
707         resources[1] = *res;
708 
709         /* allocate the child platform device */
710         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
711         if (!musb) {
712                 dev_err(dev, "failed to allocate musb device\n");
713                 return -ENOMEM;
714         }
715 
716         musb->dev.parent                = dev;
717         musb->dev.dma_mask              = &musb_dmamask;
718         musb->dev.coherent_dma_mask     = musb_dmamask;
719         musb->dev.of_node               = of_node_get(dn);
720 
721         glue->musb = musb;
722 
723         ret = platform_device_add_resources(musb, resources,
724                         ARRAY_SIZE(resources));
725         if (ret) {
726                 dev_err(dev, "failed to add resources\n");
727                 goto err;
728         }
729 
730         config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
731         if (!config) {
732                 dev_err(dev, "failed to allocate musb hdrc config\n");
733                 ret = -ENOMEM;
734                 goto err;
735         }
736         pdata.config = config;
737         pdata.platform_ops = &dsps_ops;
738 
739         config->num_eps = get_int_prop(dn, "mentor,num-eps");
740         config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
741         config->host_port_deassert_reset_at_resume = 1;
742         pdata.mode = get_musb_port_mode(dev);
743         /* DT keeps this entry in mA, musb expects it as per USB spec */
744         pdata.power = get_int_prop(dn, "mentor,power") / 2;
745         config->multipoint = of_property_read_bool(dn, "mentor,multipoint");
746 
747         ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
748         if (ret) {
749                 dev_err(dev, "failed to add platform_data\n");
750                 goto err;
751         }
752 
753         ret = platform_device_add(musb);
754         if (ret) {
755                 dev_err(dev, "failed to register musb device\n");
756                 goto err;
757         }
758         return 0;
759 
760 err:
761         platform_device_put(musb);
762         return ret;
763 }
764 
765 static int dsps_probe(struct platform_device *pdev)
766 {
767         const struct of_device_id *match;
768         const struct dsps_musb_wrapper *wrp;
769         struct dsps_glue *glue;
770         int ret;
771 
772         if (!strcmp(pdev->name, "musb-hdrc"))
773                 return -ENODEV;
774 
775         match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
776         if (!match) {
777                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
778                 return -EINVAL;
779         }
780         wrp = match->data;
781 
782         /* allocate glue */
783         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
784         if (!glue) {
785                 dev_err(&pdev->dev, "unable to allocate glue memory\n");
786                 return -ENOMEM;
787         }
788 
789         glue->dev = &pdev->dev;
790         glue->wrp = wrp;
791 
792         platform_set_drvdata(pdev, glue);
793         pm_runtime_enable(&pdev->dev);
794 
795         ret = pm_runtime_get_sync(&pdev->dev);
796         if (ret < 0) {
797                 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
798                 goto err2;
799         }
800 
801         ret = dsps_create_musb_pdev(glue, pdev);
802         if (ret)
803                 goto err3;
804 
805         return 0;
806 
807 err3:
808         pm_runtime_put(&pdev->dev);
809 err2:
810         pm_runtime_disable(&pdev->dev);
811         return ret;
812 }
813 
814 static int dsps_remove(struct platform_device *pdev)
815 {
816         struct dsps_glue *glue = platform_get_drvdata(pdev);
817 
818         platform_device_unregister(glue->musb);
819 
820         /* disable usbss clocks */
821         pm_runtime_put(&pdev->dev);
822         pm_runtime_disable(&pdev->dev);
823 
824         return 0;
825 }
826 
827 static const struct dsps_musb_wrapper am33xx_driver_data = {
828         .revision               = 0x00,
829         .control                = 0x14,
830         .status                 = 0x18,
831         .epintr_set             = 0x38,
832         .epintr_clear           = 0x40,
833         .epintr_status          = 0x30,
834         .coreintr_set           = 0x3c,
835         .coreintr_clear         = 0x44,
836         .coreintr_status        = 0x34,
837         .phy_utmi               = 0xe0,
838         .mode                   = 0xe8,
839         .tx_mode                = 0x70,
840         .rx_mode                = 0x74,
841         .reset                  = 0,
842         .otg_disable            = 21,
843         .iddig                  = 8,
844         .iddig_mux              = 7,
845         .usb_shift              = 0,
846         .usb_mask               = 0x1ff,
847         .usb_bitmap             = (0x1ff << 0),
848         .drvvbus                = 8,
849         .txep_shift             = 0,
850         .txep_mask              = 0xffff,
851         .txep_bitmap            = (0xffff << 0),
852         .rxep_shift             = 16,
853         .rxep_mask              = 0xfffe,
854         .rxep_bitmap            = (0xfffe << 16),
855         .poll_seconds           = 2,
856 };
857 
858 static const struct of_device_id musb_dsps_of_match[] = {
859         { .compatible = "ti,musb-am33xx",
860                 .data = (void *) &am33xx_driver_data, },
861         {  },
862 };
863 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
864 
865 #ifdef CONFIG_PM_SLEEP
866 static int dsps_suspend(struct device *dev)
867 {
868         struct dsps_glue *glue = dev_get_drvdata(dev);
869         const struct dsps_musb_wrapper *wrp = glue->wrp;
870         struct musb *musb = platform_get_drvdata(glue->musb);
871         void __iomem *mbase = musb->ctrl_base;
872 
873         glue->context.control = dsps_readl(mbase, wrp->control);
874         glue->context.epintr = dsps_readl(mbase, wrp->epintr_set);
875         glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set);
876         glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi);
877         glue->context.mode = dsps_readl(mbase, wrp->mode);
878         glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode);
879         glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode);
880 
881         return 0;
882 }
883 
884 static int dsps_resume(struct device *dev)
885 {
886         struct dsps_glue *glue = dev_get_drvdata(dev);
887         const struct dsps_musb_wrapper *wrp = glue->wrp;
888         struct musb *musb = platform_get_drvdata(glue->musb);
889         void __iomem *mbase = musb->ctrl_base;
890 
891         dsps_writel(mbase, wrp->control, glue->context.control);
892         dsps_writel(mbase, wrp->epintr_set, glue->context.epintr);
893         dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
894         dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
895         dsps_writel(mbase, wrp->mode, glue->context.mode);
896         dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
897         dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
898 
899         return 0;
900 }
901 #endif
902 
903 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
904 
905 static struct platform_driver dsps_usbss_driver = {
906         .probe          = dsps_probe,
907         .remove         = dsps_remove,
908         .driver         = {
909                 .name   = "musb-dsps",
910                 .pm     = &dsps_pm_ops,
911                 .of_match_table = musb_dsps_of_match,
912         },
913 };
914 
915 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
916 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
917 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
918 MODULE_LICENSE("GPL v2");
919 
920 module_platform_driver(dsps_usbss_driver);
921 

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