Version:  2.0.40 2.2.26 2.4.37 3.11 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

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 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
149 {
150         struct device *dev = musb->controller;
151         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
152 
153         if (timeout == 0)
154                 timeout = jiffies + msecs_to_jiffies(3);
155 
156         /* Never idle if active, or when VBUS timeout is not set as host */
157         if (musb->is_active || (musb->a_wait_bcon == 0 &&
158                         musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) {
159                 dev_dbg(musb->controller, "%s active, deleting timer\n",
160                                 usb_otg_state_string(musb->xceiv->otg->state));
161                 del_timer(&glue->timer);
162                 glue->last_timer = jiffies;
163                 return;
164         }
165         if (musb->port_mode != MUSB_PORT_MODE_DUAL_ROLE)
166                 return;
167 
168         if (!musb->g.dev.driver)
169                 return;
170 
171         if (time_after(glue->last_timer, timeout) &&
172                                 timer_pending(&glue->timer)) {
173                 dev_dbg(musb->controller,
174                         "Longer idle timer already pending, ignoring...\n");
175                 return;
176         }
177         glue->last_timer = timeout;
178 
179         dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
180                 usb_otg_state_string(musb->xceiv->otg->state),
181                         jiffies_to_msecs(timeout - jiffies));
182         mod_timer(&glue->timer, timeout);
183 }
184 
185 /**
186  * dsps_musb_enable - enable interrupts
187  */
188 static void dsps_musb_enable(struct musb *musb)
189 {
190         struct device *dev = musb->controller;
191         struct platform_device *pdev = to_platform_device(dev->parent);
192         struct dsps_glue *glue = platform_get_drvdata(pdev);
193         const struct dsps_musb_wrapper *wrp = glue->wrp;
194         void __iomem *reg_base = musb->ctrl_base;
195         u32 epmask, coremask;
196 
197         /* Workaround: setup IRQs through both register sets. */
198         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
199                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
200         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
201 
202         musb_writel(reg_base, wrp->epintr_set, epmask);
203         musb_writel(reg_base, wrp->coreintr_set, coremask);
204         /* start polling for ID change in dual-role idle mode */
205         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
206                         musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
207                 mod_timer(&glue->timer, jiffies +
208                                 msecs_to_jiffies(wrp->poll_timeout));
209         dsps_musb_try_idle(musb, 0);
210 }
211 
212 /**
213  * dsps_musb_disable - disable HDRC and flush interrupts
214  */
215 static void dsps_musb_disable(struct musb *musb)
216 {
217         struct device *dev = musb->controller;
218         struct platform_device *pdev = to_platform_device(dev->parent);
219         struct dsps_glue *glue = platform_get_drvdata(pdev);
220         const struct dsps_musb_wrapper *wrp = glue->wrp;
221         void __iomem *reg_base = musb->ctrl_base;
222 
223         musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
224         musb_writel(reg_base, wrp->epintr_clear,
225                          wrp->txep_bitmap | wrp->rxep_bitmap);
226         musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
227 }
228 
229 static void otg_timer(unsigned long _musb)
230 {
231         struct musb *musb = (void *)_musb;
232         void __iomem *mregs = musb->mregs;
233         struct device *dev = musb->controller;
234         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
235         const struct dsps_musb_wrapper *wrp = glue->wrp;
236         u8 devctl;
237         unsigned long flags;
238         int skip_session = 0;
239 
240         /*
241          * We poll because DSPS IP's won't expose several OTG-critical
242          * status change events (from the transceiver) otherwise.
243          */
244         devctl = musb_readb(mregs, MUSB_DEVCTL);
245         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
246                                 usb_otg_state_string(musb->xceiv->otg->state));
247 
248         spin_lock_irqsave(&musb->lock, flags);
249         switch (musb->xceiv->otg->state) {
250         case OTG_STATE_A_WAIT_BCON:
251                 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
252                 skip_session = 1;
253                 /* fall */
254 
255         case OTG_STATE_A_IDLE:
256         case OTG_STATE_B_IDLE:
257                 if (devctl & MUSB_DEVCTL_BDEVICE) {
258                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
259                         MUSB_DEV_MODE(musb);
260                 } else {
261                         musb->xceiv->otg->state = OTG_STATE_A_IDLE;
262                         MUSB_HST_MODE(musb);
263                 }
264                 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
265                         musb_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
266                 mod_timer(&glue->timer, jiffies +
267                                 msecs_to_jiffies(wrp->poll_timeout));
268                 break;
269         case OTG_STATE_A_WAIT_VFALL:
270                 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
271                 musb_writel(musb->ctrl_base, wrp->coreintr_set,
272                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
273                 break;
274         default:
275                 break;
276         }
277         spin_unlock_irqrestore(&musb->lock, flags);
278 }
279 
280 static irqreturn_t dsps_interrupt(int irq, void *hci)
281 {
282         struct musb  *musb = hci;
283         void __iomem *reg_base = musb->ctrl_base;
284         struct device *dev = musb->controller;
285         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
286         const struct dsps_musb_wrapper *wrp = glue->wrp;
287         unsigned long flags;
288         irqreturn_t ret = IRQ_NONE;
289         u32 epintr, usbintr;
290 
291         spin_lock_irqsave(&musb->lock, flags);
292 
293         /* Get endpoint interrupts */
294         epintr = musb_readl(reg_base, wrp->epintr_status);
295         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
296         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
297 
298         if (epintr)
299                 musb_writel(reg_base, wrp->epintr_status, epintr);
300 
301         /* Get usb core interrupts */
302         usbintr = musb_readl(reg_base, wrp->coreintr_status);
303         if (!usbintr && !epintr)
304                 goto out;
305 
306         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
307         if (usbintr)
308                 musb_writel(reg_base, wrp->coreintr_status, usbintr);
309 
310         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
311                         usbintr, epintr);
312 
313         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
314                 int drvvbus = musb_readl(reg_base, wrp->status);
315                 void __iomem *mregs = musb->mregs;
316                 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
317                 int err;
318 
319                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
320                 if (err) {
321                         /*
322                          * The Mentor core doesn't debounce VBUS as needed
323                          * to cope with device connect current spikes. This
324                          * means it's not uncommon for bus-powered devices
325                          * to get VBUS errors during enumeration.
326                          *
327                          * This is a workaround, but newer RTL from Mentor
328                          * seems to allow a better one: "re"-starting sessions
329                          * without waiting for VBUS to stop registering in
330                          * devctl.
331                          */
332                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
333                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
334                         mod_timer(&glue->timer, jiffies +
335                                         msecs_to_jiffies(wrp->poll_timeout));
336                         WARNING("VBUS error workaround (delay coming)\n");
337                 } else if (drvvbus) {
338                         MUSB_HST_MODE(musb);
339                         musb->xceiv->otg->default_a = 1;
340                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
341                         del_timer(&glue->timer);
342                 } else {
343                         musb->is_active = 0;
344                         MUSB_DEV_MODE(musb);
345                         musb->xceiv->otg->default_a = 0;
346                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
347                 }
348 
349                 /* NOTE: this must complete power-on within 100 ms. */
350                 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
351                                 drvvbus ? "on" : "off",
352                                 usb_otg_state_string(musb->xceiv->otg->state),
353                                 err ? " ERROR" : "",
354                                 devctl);
355                 ret = IRQ_HANDLED;
356         }
357 
358         if (musb->int_tx || musb->int_rx || musb->int_usb)
359                 ret |= musb_interrupt(musb);
360 
361         /* Poll for ID change in OTG port mode */
362         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
363                         musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
364                 mod_timer(&glue->timer, jiffies +
365                                 msecs_to_jiffies(wrp->poll_timeout));
366 out:
367         spin_unlock_irqrestore(&musb->lock, flags);
368 
369         return ret;
370 }
371 
372 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
373 {
374         struct dentry *root;
375         struct dentry *file;
376         char buf[128];
377 
378         sprintf(buf, "%s.dsps", dev_name(musb->controller));
379         root = debugfs_create_dir(buf, NULL);
380         if (!root)
381                 return -ENOMEM;
382         glue->dbgfs_root = root;
383 
384         glue->regset.regs = dsps_musb_regs;
385         glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
386         glue->regset.base = musb->ctrl_base;
387 
388         file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
389         if (!file) {
390                 debugfs_remove_recursive(root);
391                 return -ENOMEM;
392         }
393         return 0;
394 }
395 
396 static int dsps_musb_init(struct musb *musb)
397 {
398         struct device *dev = musb->controller;
399         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
400         struct platform_device *parent = to_platform_device(dev->parent);
401         const struct dsps_musb_wrapper *wrp = glue->wrp;
402         void __iomem *reg_base;
403         struct resource *r;
404         u32 rev, val;
405         int ret;
406 
407         r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
408         reg_base = devm_ioremap_resource(dev, r);
409         if (IS_ERR(reg_base))
410                 return PTR_ERR(reg_base);
411         musb->ctrl_base = reg_base;
412 
413         /* NOP driver needs change if supporting dual instance */
414         musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
415         if (IS_ERR(musb->xceiv))
416                 return PTR_ERR(musb->xceiv);
417 
418         musb->phy = devm_phy_get(dev->parent, "usb2-phy");
419 
420         /* Returns zero if e.g. not clocked */
421         rev = musb_readl(reg_base, wrp->revision);
422         if (!rev)
423                 return -ENODEV;
424 
425         usb_phy_init(musb->xceiv);
426         if (IS_ERR(musb->phy))  {
427                 musb->phy = NULL;
428         } else {
429                 ret = phy_init(musb->phy);
430                 if (ret < 0)
431                         return ret;
432                 ret = phy_power_on(musb->phy);
433                 if (ret) {
434                         phy_exit(musb->phy);
435                         return ret;
436                 }
437         }
438 
439         setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
440 
441         /* Reset the musb */
442         musb_writel(reg_base, wrp->control, (1 << wrp->reset));
443 
444         musb->isr = dsps_interrupt;
445 
446         /* reset the otgdisable bit, needed for host mode to work */
447         val = musb_readl(reg_base, wrp->phy_utmi);
448         val &= ~(1 << wrp->otg_disable);
449         musb_writel(musb->ctrl_base, wrp->phy_utmi, val);
450 
451         /*
452          *  Check whether the dsps version has babble control enabled.
453          * In latest silicon revision the babble control logic is enabled.
454          * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
455          * logic enabled.
456          */
457         val = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
458         if (val & MUSB_BABBLE_RCV_DISABLE) {
459                 glue->sw_babble_enabled = true;
460                 val |= MUSB_BABBLE_SW_SESSION_CTRL;
461                 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
462         }
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         .try_idle       = dsps_musb_try_idle,
624         .set_mode       = dsps_musb_set_mode,
625         .recover        = dsps_musb_recover,
626 };
627 
628 static u64 musb_dmamask = DMA_BIT_MASK(32);
629 
630 static int get_int_prop(struct device_node *dn, const char *s)
631 {
632         int ret;
633         u32 val;
634 
635         ret = of_property_read_u32(dn, s, &val);
636         if (ret)
637                 return 0;
638         return val;
639 }
640 
641 static int get_musb_port_mode(struct device *dev)
642 {
643         enum usb_dr_mode mode;
644 
645         mode = usb_get_dr_mode(dev);
646         switch (mode) {
647         case USB_DR_MODE_HOST:
648                 return MUSB_PORT_MODE_HOST;
649 
650         case USB_DR_MODE_PERIPHERAL:
651                 return MUSB_PORT_MODE_GADGET;
652 
653         case USB_DR_MODE_UNKNOWN:
654         case USB_DR_MODE_OTG:
655         default:
656                 return MUSB_PORT_MODE_DUAL_ROLE;
657         }
658 }
659 
660 static int dsps_create_musb_pdev(struct dsps_glue *glue,
661                 struct platform_device *parent)
662 {
663         struct musb_hdrc_platform_data pdata;
664         struct resource resources[2];
665         struct resource *res;
666         struct device *dev = &parent->dev;
667         struct musb_hdrc_config *config;
668         struct platform_device *musb;
669         struct device_node *dn = parent->dev.of_node;
670         int ret, val;
671 
672         memset(resources, 0, sizeof(resources));
673         res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
674         if (!res) {
675                 dev_err(dev, "failed to get memory.\n");
676                 return -EINVAL;
677         }
678         resources[0] = *res;
679 
680         res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
681         if (!res) {
682                 dev_err(dev, "failed to get irq.\n");
683                 return -EINVAL;
684         }
685         resources[1] = *res;
686 
687         /* allocate the child platform device */
688         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
689         if (!musb) {
690                 dev_err(dev, "failed to allocate musb device\n");
691                 return -ENOMEM;
692         }
693 
694         musb->dev.parent                = dev;
695         musb->dev.dma_mask              = &musb_dmamask;
696         musb->dev.coherent_dma_mask     = musb_dmamask;
697 
698         glue->musb = musb;
699 
700         ret = platform_device_add_resources(musb, resources,
701                         ARRAY_SIZE(resources));
702         if (ret) {
703                 dev_err(dev, "failed to add resources\n");
704                 goto err;
705         }
706 
707         config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
708         if (!config) {
709                 ret = -ENOMEM;
710                 goto err;
711         }
712         pdata.config = config;
713         pdata.platform_ops = &dsps_ops;
714 
715         config->num_eps = get_int_prop(dn, "mentor,num-eps");
716         config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
717         config->host_port_deassert_reset_at_resume = 1;
718         pdata.mode = get_musb_port_mode(dev);
719         /* DT keeps this entry in mA, musb expects it as per USB spec */
720         pdata.power = get_int_prop(dn, "mentor,power") / 2;
721 
722         ret = of_property_read_u32(dn, "mentor,multipoint", &val);
723         if (!ret && val)
724                 config->multipoint = true;
725 
726         config->maximum_speed = usb_get_maximum_speed(&parent->dev);
727         switch (config->maximum_speed) {
728         case USB_SPEED_LOW:
729         case USB_SPEED_FULL:
730                 break;
731         case USB_SPEED_SUPER:
732                 dev_warn(dev, "ignore incorrect maximum_speed "
733                                 "(super-speed) setting in dts");
734                 /* fall through */
735         default:
736                 config->maximum_speed = USB_SPEED_HIGH;
737         }
738 
739         ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
740         if (ret) {
741                 dev_err(dev, "failed to add platform_data\n");
742                 goto err;
743         }
744 
745         ret = platform_device_add(musb);
746         if (ret) {
747                 dev_err(dev, "failed to register musb device\n");
748                 goto err;
749         }
750         return 0;
751 
752 err:
753         platform_device_put(musb);
754         return ret;
755 }
756 
757 static int dsps_probe(struct platform_device *pdev)
758 {
759         const struct of_device_id *match;
760         const struct dsps_musb_wrapper *wrp;
761         struct dsps_glue *glue;
762         int ret;
763 
764         if (!strcmp(pdev->name, "musb-hdrc"))
765                 return -ENODEV;
766 
767         match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
768         if (!match) {
769                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
770                 return -EINVAL;
771         }
772         wrp = match->data;
773 
774         if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
775                 dsps_ops.read_fifo = dsps_read_fifo32;
776 
777         /* allocate glue */
778         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
779         if (!glue)
780                 return -ENOMEM;
781 
782         glue->dev = &pdev->dev;
783         glue->wrp = wrp;
784 
785         platform_set_drvdata(pdev, glue);
786         pm_runtime_enable(&pdev->dev);
787 
788         ret = pm_runtime_get_sync(&pdev->dev);
789         if (ret < 0) {
790                 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
791                 goto err2;
792         }
793 
794         ret = dsps_create_musb_pdev(glue, pdev);
795         if (ret)
796                 goto err3;
797 
798         return 0;
799 
800 err3:
801         pm_runtime_put(&pdev->dev);
802 err2:
803         pm_runtime_disable(&pdev->dev);
804         return ret;
805 }
806 
807 static int dsps_remove(struct platform_device *pdev)
808 {
809         struct dsps_glue *glue = platform_get_drvdata(pdev);
810 
811         platform_device_unregister(glue->musb);
812 
813         /* disable usbss clocks */
814         pm_runtime_put(&pdev->dev);
815         pm_runtime_disable(&pdev->dev);
816 
817         return 0;
818 }
819 
820 static const struct dsps_musb_wrapper am33xx_driver_data = {
821         .revision               = 0x00,
822         .control                = 0x14,
823         .status                 = 0x18,
824         .epintr_set             = 0x38,
825         .epintr_clear           = 0x40,
826         .epintr_status          = 0x30,
827         .coreintr_set           = 0x3c,
828         .coreintr_clear         = 0x44,
829         .coreintr_status        = 0x34,
830         .phy_utmi               = 0xe0,
831         .mode                   = 0xe8,
832         .tx_mode                = 0x70,
833         .rx_mode                = 0x74,
834         .reset                  = 0,
835         .otg_disable            = 21,
836         .iddig                  = 8,
837         .iddig_mux              = 7,
838         .usb_shift              = 0,
839         .usb_mask               = 0x1ff,
840         .usb_bitmap             = (0x1ff << 0),
841         .drvvbus                = 8,
842         .txep_shift             = 0,
843         .txep_mask              = 0xffff,
844         .txep_bitmap            = (0xffff << 0),
845         .rxep_shift             = 16,
846         .rxep_mask              = 0xfffe,
847         .rxep_bitmap            = (0xfffe << 16),
848         .poll_timeout           = 2000, /* ms */
849 };
850 
851 static const struct of_device_id musb_dsps_of_match[] = {
852         { .compatible = "ti,musb-am33xx",
853                 .data = &am33xx_driver_data, },
854         { .compatible = "ti,musb-dm816",
855                 .data = &am33xx_driver_data, },
856         {  },
857 };
858 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
859 
860 #ifdef CONFIG_PM_SLEEP
861 static int dsps_suspend(struct device *dev)
862 {
863         struct dsps_glue *glue = dev_get_drvdata(dev);
864         const struct dsps_musb_wrapper *wrp = glue->wrp;
865         struct musb *musb = platform_get_drvdata(glue->musb);
866         void __iomem *mbase;
867 
868         del_timer_sync(&glue->timer);
869 
870         if (!musb)
871                 /* This can happen if the musb device is in -EPROBE_DEFER */
872                 return 0;
873 
874         mbase = musb->ctrl_base;
875         glue->context.control = musb_readl(mbase, wrp->control);
876         glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
877         glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set);
878         glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi);
879         glue->context.mode = musb_readl(mbase, wrp->mode);
880         glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
881         glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
882 
883         return 0;
884 }
885 
886 static int dsps_resume(struct device *dev)
887 {
888         struct dsps_glue *glue = dev_get_drvdata(dev);
889         const struct dsps_musb_wrapper *wrp = glue->wrp;
890         struct musb *musb = platform_get_drvdata(glue->musb);
891         void __iomem *mbase;
892 
893         if (!musb)
894                 return 0;
895 
896         mbase = musb->ctrl_base;
897         musb_writel(mbase, wrp->control, glue->context.control);
898         musb_writel(mbase, wrp->epintr_set, glue->context.epintr);
899         musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
900         musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
901         musb_writel(mbase, wrp->mode, glue->context.mode);
902         musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
903         musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
904         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
905             musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
906                 mod_timer(&glue->timer, jiffies +
907                                 msecs_to_jiffies(wrp->poll_timeout));
908 
909         return 0;
910 }
911 #endif
912 
913 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
914 
915 static struct platform_driver dsps_usbss_driver = {
916         .probe          = dsps_probe,
917         .remove         = dsps_remove,
918         .driver         = {
919                 .name   = "musb-dsps",
920                 .pm     = &dsps_pm_ops,
921                 .of_match_table = musb_dsps_of_match,
922         },
923 };
924 
925 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
926 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
927 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
928 MODULE_LICENSE("GPL v2");
929 
930 module_platform_driver(dsps_usbss_driver);
931 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us