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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Texas Instruments DSPS platforms "glue layer"
4 *
5 * Copyright (C) 2012, by Texas Instruments
6 *
7 * Based on the am35x "glue layer" code.
8 *
9 * This file is part of the Inventra Controller Driver for Linux.
10 *
11 * musb_dsps.c will be a common file for all the TI DSPS platforms
12 * such as dm64x, dm36x, dm35x, da8x, am35x and ti81x.
13 * For now only ti81x is using this and in future davinci.c, am35x.c
14 * da8xx.c would be merged to this file after testing.
15 */
16
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/err.h>
20#include <linux/platform_device.h>
21#include <linux/dma-mapping.h>
22#include <linux/pm_runtime.h>
23#include <linux/module.h>
24#include <linux/usb/usb_phy_generic.h>
25#include <linux/platform_data/usb-omap.h>
26#include <linux/sizes.h>
27
28#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/usb/of.h>
31
32#include <linux/debugfs.h>
33
34#include "musb_core.h"
35
36static const struct of_device_id musb_dsps_of_match[];
37
38/*
39 * DSPS musb wrapper register offset.
40 * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
41 * musb ips.
42 */
43struct dsps_musb_wrapper {
44 u16 revision;
45 u16 control;
46 u16 status;
47 u16 epintr_set;
48 u16 epintr_clear;
49 u16 epintr_status;
50 u16 coreintr_set;
51 u16 coreintr_clear;
52 u16 coreintr_status;
53 u16 phy_utmi;
54 u16 mode;
55 u16 tx_mode;
56 u16 rx_mode;
57
58 /* bit positions for control */
59 unsigned reset:5;
60
61 /* bit positions for interrupt */
62 unsigned usb_shift:5;
63 u32 usb_mask;
64 u32 usb_bitmap;
65 unsigned drvvbus:5;
66
67 unsigned txep_shift:5;
68 u32 txep_mask;
69 u32 txep_bitmap;
70
71 unsigned rxep_shift:5;
72 u32 rxep_mask;
73 u32 rxep_bitmap;
74
75 /* bit positions for phy_utmi */
76 unsigned otg_disable:5;
77
78 /* bit positions for mode */
79 unsigned iddig:5;
80 unsigned iddig_mux:5;
81 /* miscellaneous stuff */
82 unsigned poll_timeout;
83};
84
85/*
86 * register shadow for suspend
87 */
88struct dsps_context {
89 u32 control;
90 u32 epintr;
91 u32 coreintr;
92 u32 phy_utmi;
93 u32 mode;
94 u32 tx_mode;
95 u32 rx_mode;
96};
97
98/*
99 * DSPS glue structure.
100 */
101struct dsps_glue {
102 struct device *dev;
103 struct platform_device *musb; /* child musb pdev */
104 const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
105 int vbus_irq; /* optional vbus irq */
106 unsigned long last_timer; /* last timer data for each instance */
107 bool sw_babble_enabled;
108 void __iomem *usbss_base;
109
110 struct dsps_context context;
111 struct debugfs_regset32 regset;
112 struct dentry *dbgfs_root;
113};
114
115static const struct debugfs_reg32 dsps_musb_regs[] = {
116 { "revision", 0x00 },
117 { "control", 0x14 },
118 { "status", 0x18 },
119 { "eoi", 0x24 },
120 { "intr0_stat", 0x30 },
121 { "intr1_stat", 0x34 },
122 { "intr0_set", 0x38 },
123 { "intr1_set", 0x3c },
124 { "txmode", 0x70 },
125 { "rxmode", 0x74 },
126 { "autoreq", 0xd0 },
127 { "srpfixtime", 0xd4 },
128 { "tdown", 0xd8 },
129 { "phy_utmi", 0xe0 },
130 { "mode", 0xe8 },
131};
132
133static void dsps_mod_timer(struct dsps_glue *glue, int wait_ms)
134{
135 struct musb *musb = platform_get_drvdata(glue->musb);
136 int wait;
137
138 if (wait_ms < 0)
139 wait = msecs_to_jiffies(glue->wrp->poll_timeout);
140 else
141 wait = msecs_to_jiffies(wait_ms);
142
143 mod_timer(&musb->dev_timer, jiffies + wait);
144}
145
146/*
147 * If no vbus irq from the PMIC is configured, we need to poll VBUS status.
148 */
149static void dsps_mod_timer_optional(struct dsps_glue *glue)
150{
151 if (glue->vbus_irq)
152 return;
153
154 dsps_mod_timer(glue, -1);
155}
156
157/* USBSS / USB AM335x */
158#define USBSS_IRQ_STATUS 0x28
159#define USBSS_IRQ_ENABLER 0x2c
160#define USBSS_IRQ_CLEARR 0x30
161
162#define USBSS_IRQ_PD_COMP (1 << 2)
163
164/*
165 * dsps_musb_enable - enable interrupts
166 */
167static void dsps_musb_enable(struct musb *musb)
168{
169 struct device *dev = musb->controller;
170 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
171 const struct dsps_musb_wrapper *wrp = glue->wrp;
172 void __iomem *reg_base = musb->ctrl_base;
173 u32 epmask, coremask;
174
175 /* Workaround: setup IRQs through both register sets. */
176 epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
177 ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
178 coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
179
180 musb_writel(reg_base, wrp->epintr_set, epmask);
181 musb_writel(reg_base, wrp->coreintr_set, coremask);
182 /*
183 * start polling for runtime PM active and idle,
184 * and for ID change in dual-role idle mode.
185 */
186 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE)
187 dsps_mod_timer(glue, -1);
188}
189
190/*
191 * dsps_musb_disable - disable HDRC and flush interrupts
192 */
193static void dsps_musb_disable(struct musb *musb)
194{
195 struct device *dev = musb->controller;
196 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
197 const struct dsps_musb_wrapper *wrp = glue->wrp;
198 void __iomem *reg_base = musb->ctrl_base;
199
200 musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
201 musb_writel(reg_base, wrp->epintr_clear,
202 wrp->txep_bitmap | wrp->rxep_bitmap);
203 del_timer_sync(&musb->dev_timer);
204}
205
206/* Caller must take musb->lock */
207static int dsps_check_status(struct musb *musb, void *unused)
208{
209 void __iomem *mregs = musb->mregs;
210 struct device *dev = musb->controller;
211 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
212 const struct dsps_musb_wrapper *wrp = glue->wrp;
213 u8 devctl;
214 int skip_session = 0;
215
216 if (glue->vbus_irq)
217 del_timer(&musb->dev_timer);
218
219 /*
220 * We poll because DSPS IP's won't expose several OTG-critical
221 * status change events (from the transceiver) otherwise.
222 */
223 devctl = musb_readb(mregs, MUSB_DEVCTL);
224 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
225 usb_otg_state_string(musb->xceiv->otg->state));
226
227 switch (musb->xceiv->otg->state) {
228 case OTG_STATE_A_WAIT_VRISE:
229 if (musb->port_mode == MUSB_HOST) {
230 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
231 dsps_mod_timer_optional(glue);
232 break;
233 }
234 fallthrough;
235
236 case OTG_STATE_A_WAIT_BCON:
237 /* keep VBUS on for host-only mode */
238 if (musb->port_mode == MUSB_HOST) {
239 dsps_mod_timer_optional(glue);
240 break;
241 }
242 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
243 skip_session = 1;
244 fallthrough;
245
246 case OTG_STATE_A_IDLE:
247 case OTG_STATE_B_IDLE:
248 if (!glue->vbus_irq) {
249 if (devctl & MUSB_DEVCTL_BDEVICE) {
250 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
251 MUSB_DEV_MODE(musb);
252 } else {
253 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
254 MUSB_HST_MODE(musb);
255 }
256
257 if (musb->port_mode == MUSB_PERIPHERAL)
258 skip_session = 1;
259
260 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
261 musb_writeb(mregs, MUSB_DEVCTL,
262 MUSB_DEVCTL_SESSION);
263 }
264 dsps_mod_timer_optional(glue);
265 break;
266 case OTG_STATE_A_WAIT_VFALL:
267 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
268 musb_writel(musb->ctrl_base, wrp->coreintr_set,
269 MUSB_INTR_VBUSERROR << wrp->usb_shift);
270 break;
271 default:
272 break;
273 }
274
275 return 0;
276}
277
278static void otg_timer(struct timer_list *t)
279{
280 struct musb *musb = from_timer(musb, t, dev_timer);
281 struct device *dev = musb->controller;
282 unsigned long flags;
283 int err;
284
285 err = pm_runtime_get(dev);
286 if ((err != -EINPROGRESS) && err < 0) {
287 dev_err(dev, "Poll could not pm_runtime_get: %i\n", err);
288 pm_runtime_put_noidle(dev);
289
290 return;
291 }
292
293 spin_lock_irqsave(&musb->lock, flags);
294 err = musb_queue_resume_work(musb, dsps_check_status, NULL);
295 if (err < 0)
296 dev_err(dev, "%s resume work: %i\n", __func__, err);
297 spin_unlock_irqrestore(&musb->lock, flags);
298 pm_runtime_mark_last_busy(dev);
299 pm_runtime_put_autosuspend(dev);
300}
301
302static void dsps_musb_clear_ep_rxintr(struct musb *musb, int epnum)
303{
304 u32 epintr;
305 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
306 const struct dsps_musb_wrapper *wrp = glue->wrp;
307
308 /* musb->lock might already been held */
309 epintr = (1 << epnum) << wrp->rxep_shift;
310 musb_writel(musb->ctrl_base, wrp->epintr_status, epintr);
311}
312
313static irqreturn_t dsps_interrupt(int irq, void *hci)
314{
315 struct musb *musb = hci;
316 void __iomem *reg_base = musb->ctrl_base;
317 struct device *dev = musb->controller;
318 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
319 const struct dsps_musb_wrapper *wrp = glue->wrp;
320 unsigned long flags;
321 irqreturn_t ret = IRQ_NONE;
322 u32 epintr, usbintr;
323
324 spin_lock_irqsave(&musb->lock, flags);
325
326 /* Get endpoint interrupts */
327 epintr = musb_readl(reg_base, wrp->epintr_status);
328 musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
329 musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
330
331 if (epintr)
332 musb_writel(reg_base, wrp->epintr_status, epintr);
333
334 /* Get usb core interrupts */
335 usbintr = musb_readl(reg_base, wrp->coreintr_status);
336 if (!usbintr && !epintr)
337 goto out;
338
339 musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
340 if (usbintr)
341 musb_writel(reg_base, wrp->coreintr_status, usbintr);
342
343 dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
344 usbintr, epintr);
345
346 if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
347 int drvvbus = musb_readl(reg_base, wrp->status);
348 void __iomem *mregs = musb->mregs;
349 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
350 int err;
351
352 err = musb->int_usb & MUSB_INTR_VBUSERROR;
353 if (err) {
354 /*
355 * The Mentor core doesn't debounce VBUS as needed
356 * to cope with device connect current spikes. This
357 * means it's not uncommon for bus-powered devices
358 * to get VBUS errors during enumeration.
359 *
360 * This is a workaround, but newer RTL from Mentor
361 * seems to allow a better one: "re"-starting sessions
362 * without waiting for VBUS to stop registering in
363 * devctl.
364 */
365 musb->int_usb &= ~MUSB_INTR_VBUSERROR;
366 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
367 dsps_mod_timer_optional(glue);
368 WARNING("VBUS error workaround (delay coming)\n");
369 } else if (drvvbus) {
370 MUSB_HST_MODE(musb);
371 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
372 dsps_mod_timer_optional(glue);
373 } else {
374 musb->is_active = 0;
375 MUSB_DEV_MODE(musb);
376 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
377 }
378
379 /* NOTE: this must complete power-on within 100 ms. */
380 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
381 drvvbus ? "on" : "off",
382 usb_otg_state_string(musb->xceiv->otg->state),
383 err ? " ERROR" : "",
384 devctl);
385 ret = IRQ_HANDLED;
386 }
387
388 if (musb->int_tx || musb->int_rx || musb->int_usb)
389 ret |= musb_interrupt(musb);
390
391 /* Poll for ID change and connect */
392 switch (musb->xceiv->otg->state) {
393 case OTG_STATE_B_IDLE:
394 case OTG_STATE_A_WAIT_BCON:
395 dsps_mod_timer_optional(glue);
396 break;
397 default:
398 break;
399 }
400
401out:
402 spin_unlock_irqrestore(&musb->lock, flags);
403
404 return ret;
405}
406
407static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
408{
409 struct dentry *root;
410 char buf[128];
411
412 sprintf(buf, "%s.dsps", dev_name(musb->controller));
413 root = debugfs_create_dir(buf, usb_debug_root);
414 glue->dbgfs_root = root;
415
416 glue->regset.regs = dsps_musb_regs;
417 glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
418 glue->regset.base = musb->ctrl_base;
419
420 debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
421 return 0;
422}
423
424static int dsps_musb_init(struct musb *musb)
425{
426 struct device *dev = musb->controller;
427 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
428 struct platform_device *parent = to_platform_device(dev->parent);
429 const struct dsps_musb_wrapper *wrp = glue->wrp;
430 void __iomem *reg_base;
431 struct resource *r;
432 u32 rev, val;
433 int ret;
434
435 r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
436 reg_base = devm_ioremap_resource(dev, r);
437 if (IS_ERR(reg_base))
438 return PTR_ERR(reg_base);
439 musb->ctrl_base = reg_base;
440
441 /* NOP driver needs change if supporting dual instance */
442 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
443 if (IS_ERR(musb->xceiv))
444 return PTR_ERR(musb->xceiv);
445
446 musb->phy = devm_phy_get(dev->parent, "usb2-phy");
447
448 /* Returns zero if e.g. not clocked */
449 rev = musb_readl(reg_base, wrp->revision);
450 if (!rev)
451 return -ENODEV;
452
453 if (IS_ERR(musb->phy)) {
454 musb->phy = NULL;
455 } else {
456 ret = phy_init(musb->phy);
457 if (ret < 0)
458 return ret;
459 ret = phy_power_on(musb->phy);
460 if (ret) {
461 phy_exit(musb->phy);
462 return ret;
463 }
464 }
465
466 timer_setup(&musb->dev_timer, otg_timer, 0);
467
468 /* Reset the musb */
469 musb_writel(reg_base, wrp->control, (1 << wrp->reset));
470
471 musb->isr = dsps_interrupt;
472
473 /* reset the otgdisable bit, needed for host mode to work */
474 val = musb_readl(reg_base, wrp->phy_utmi);
475 val &= ~(1 << wrp->otg_disable);
476 musb_writel(musb->ctrl_base, wrp->phy_utmi, val);
477
478 /*
479 * Check whether the dsps version has babble control enabled.
480 * In latest silicon revision the babble control logic is enabled.
481 * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
482 * logic enabled.
483 */
484 val = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
485 if (val & MUSB_BABBLE_RCV_DISABLE) {
486 glue->sw_babble_enabled = true;
487 val |= MUSB_BABBLE_SW_SESSION_CTRL;
488 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
489 }
490
491 dsps_mod_timer(glue, -1);
492
493 return dsps_musb_dbg_init(musb, glue);
494}
495
496static int dsps_musb_exit(struct musb *musb)
497{
498 struct device *dev = musb->controller;
499 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
500
501 del_timer_sync(&musb->dev_timer);
502 phy_power_off(musb->phy);
503 phy_exit(musb->phy);
504 debugfs_remove_recursive(glue->dbgfs_root);
505
506 return 0;
507}
508
509static int dsps_musb_set_mode(struct musb *musb, u8 mode)
510{
511 struct device *dev = musb->controller;
512 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
513 const struct dsps_musb_wrapper *wrp = glue->wrp;
514 void __iomem *ctrl_base = musb->ctrl_base;
515 u32 reg;
516
517 reg = musb_readl(ctrl_base, wrp->mode);
518
519 switch (mode) {
520 case MUSB_HOST:
521 reg &= ~(1 << wrp->iddig);
522
523 /*
524 * if we're setting mode to host-only or device-only, we're
525 * going to ignore whatever the PHY sends us and just force
526 * ID pin status by SW
527 */
528 reg |= (1 << wrp->iddig_mux);
529
530 musb_writel(ctrl_base, wrp->mode, reg);
531 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
532 break;
533 case MUSB_PERIPHERAL:
534 reg |= (1 << wrp->iddig);
535
536 /*
537 * if we're setting mode to host-only or device-only, we're
538 * going to ignore whatever the PHY sends us and just force
539 * ID pin status by SW
540 */
541 reg |= (1 << wrp->iddig_mux);
542
543 musb_writel(ctrl_base, wrp->mode, reg);
544 break;
545 case MUSB_OTG:
546 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
547 break;
548 default:
549 dev_err(glue->dev, "unsupported mode %d\n", mode);
550 return -EINVAL;
551 }
552
553 return 0;
554}
555
556static bool dsps_sw_babble_control(struct musb *musb)
557{
558 u8 babble_ctl;
559 bool session_restart = false;
560
561 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
562 dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
563 babble_ctl);
564 /*
565 * check line monitor flag to check whether babble is
566 * due to noise
567 */
568 dev_dbg(musb->controller, "STUCK_J is %s\n",
569 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
570
571 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
572 int timeout = 10;
573
574 /*
575 * babble is due to noise, then set transmit idle (d7 bit)
576 * to resume normal operation
577 */
578 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
579 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
580 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
581
582 /* wait till line monitor flag cleared */
583 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
584 do {
585 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
586 udelay(1);
587 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
588
589 /* check whether stuck_at_j bit cleared */
590 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
591 /*
592 * real babble condition has occurred
593 * restart the controller to start the
594 * session again
595 */
596 dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
597 babble_ctl);
598 session_restart = true;
599 }
600 } else {
601 session_restart = true;
602 }
603
604 return session_restart;
605}
606
607static int dsps_musb_recover(struct musb *musb)
608{
609 struct device *dev = musb->controller;
610 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
611 int session_restart = 0;
612
613 if (glue->sw_babble_enabled)
614 session_restart = dsps_sw_babble_control(musb);
615 else
616 session_restart = 1;
617
618 return session_restart ? 0 : -EPIPE;
619}
620
621/* Similar to am35x, dm81xx support only 32-bit read operation */
622static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
623{
624 void __iomem *fifo = hw_ep->fifo;
625
626 if (len >= 4) {
627 ioread32_rep(fifo, dst, len >> 2);
628 dst += len & ~0x03;
629 len &= 0x03;
630 }
631
632 /* Read any remaining 1 to 3 bytes */
633 if (len > 0) {
634 u32 val = musb_readl(fifo, 0);
635 memcpy(dst, &val, len);
636 }
637}
638
639#ifdef CONFIG_USB_TI_CPPI41_DMA
640static void dsps_dma_controller_callback(struct dma_controller *c)
641{
642 struct musb *musb = c->musb;
643 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
644 void __iomem *usbss_base = glue->usbss_base;
645 u32 status;
646
647 status = musb_readl(usbss_base, USBSS_IRQ_STATUS);
648 if (status & USBSS_IRQ_PD_COMP)
649 musb_writel(usbss_base, USBSS_IRQ_STATUS, USBSS_IRQ_PD_COMP);
650}
651
652static struct dma_controller *
653dsps_dma_controller_create(struct musb *musb, void __iomem *base)
654{
655 struct dma_controller *controller;
656 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
657 void __iomem *usbss_base = glue->usbss_base;
658
659 controller = cppi41_dma_controller_create(musb, base);
660 if (IS_ERR_OR_NULL(controller))
661 return controller;
662
663 musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
664 controller->dma_callback = dsps_dma_controller_callback;
665
666 return controller;
667}
668
669#ifdef CONFIG_PM_SLEEP
670static void dsps_dma_controller_suspend(struct dsps_glue *glue)
671{
672 void __iomem *usbss_base = glue->usbss_base;
673
674 musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP);
675}
676
677static void dsps_dma_controller_resume(struct dsps_glue *glue)
678{
679 void __iomem *usbss_base = glue->usbss_base;
680
681 musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
682}
683#endif
684#else /* CONFIG_USB_TI_CPPI41_DMA */
685#ifdef CONFIG_PM_SLEEP
686static void dsps_dma_controller_suspend(struct dsps_glue *glue) {}
687static void dsps_dma_controller_resume(struct dsps_glue *glue) {}
688#endif
689#endif /* CONFIG_USB_TI_CPPI41_DMA */
690
691static struct musb_platform_ops dsps_ops = {
692 .quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
693 .init = dsps_musb_init,
694 .exit = dsps_musb_exit,
695
696#ifdef CONFIG_USB_TI_CPPI41_DMA
697 .dma_init = dsps_dma_controller_create,
698 .dma_exit = cppi41_dma_controller_destroy,
699#endif
700 .enable = dsps_musb_enable,
701 .disable = dsps_musb_disable,
702
703 .set_mode = dsps_musb_set_mode,
704 .recover = dsps_musb_recover,
705 .clear_ep_rxintr = dsps_musb_clear_ep_rxintr,
706};
707
708static u64 musb_dmamask = DMA_BIT_MASK(32);
709
710static int get_int_prop(struct device_node *dn, const char *s)
711{
712 int ret;
713 u32 val;
714
715 ret = of_property_read_u32(dn, s, &val);
716 if (ret)
717 return 0;
718 return val;
719}
720
721static int dsps_create_musb_pdev(struct dsps_glue *glue,
722 struct platform_device *parent)
723{
724 struct musb_hdrc_platform_data pdata;
725 struct resource resources[2];
726 struct resource *res;
727 struct device *dev = &parent->dev;
728 struct musb_hdrc_config *config;
729 struct platform_device *musb;
730 struct device_node *dn = parent->dev.of_node;
731 int ret, val;
732
733 memset(resources, 0, sizeof(resources));
734 res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
735 if (!res) {
736 dev_err(dev, "failed to get memory.\n");
737 return -EINVAL;
738 }
739 resources[0] = *res;
740
741 ret = platform_get_irq_byname(parent, "mc");
742 if (ret < 0)
743 return ret;
744
745 resources[1].start = ret;
746 resources[1].end = ret;
747 resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(ret);
748 resources[1].name = "mc";
749
750 /* allocate the child platform device */
751 musb = platform_device_alloc("musb-hdrc",
752 (resources[0].start & 0xFFF) == 0x400 ? 0 : 1);
753 if (!musb) {
754 dev_err(dev, "failed to allocate musb device\n");
755 return -ENOMEM;
756 }
757
758 musb->dev.parent = dev;
759 musb->dev.dma_mask = &musb_dmamask;
760 musb->dev.coherent_dma_mask = musb_dmamask;
761 device_set_of_node_from_dev(&musb->dev, &parent->dev);
762
763 glue->musb = musb;
764
765 ret = platform_device_add_resources(musb, resources,
766 ARRAY_SIZE(resources));
767 if (ret) {
768 dev_err(dev, "failed to add resources\n");
769 goto err;
770 }
771
772 config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
773 if (!config) {
774 ret = -ENOMEM;
775 goto err;
776 }
777 pdata.config = config;
778 pdata.platform_ops = &dsps_ops;
779
780 config->num_eps = get_int_prop(dn, "mentor,num-eps");
781 config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
782 config->host_port_deassert_reset_at_resume = 1;
783 pdata.mode = musb_get_mode(dev);
784 /* DT keeps this entry in mA, musb expects it as per USB spec */
785 pdata.power = get_int_prop(dn, "mentor,power") / 2;
786
787 ret = of_property_read_u32(dn, "mentor,multipoint", &val);
788 if (!ret && val)
789 config->multipoint = true;
790
791 config->maximum_speed = usb_get_maximum_speed(&parent->dev);
792 switch (config->maximum_speed) {
793 case USB_SPEED_LOW:
794 case USB_SPEED_FULL:
795 break;
796 case USB_SPEED_SUPER:
797 dev_warn(dev, "ignore incorrect maximum_speed "
798 "(super-speed) setting in dts");
799 fallthrough;
800 default:
801 config->maximum_speed = USB_SPEED_HIGH;
802 }
803
804 ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
805 if (ret) {
806 dev_err(dev, "failed to add platform_data\n");
807 goto err;
808 }
809
810 ret = platform_device_add(musb);
811 if (ret) {
812 dev_err(dev, "failed to register musb device\n");
813 goto err;
814 }
815 return 0;
816
817err:
818 platform_device_put(musb);
819 return ret;
820}
821
822static irqreturn_t dsps_vbus_threaded_irq(int irq, void *priv)
823{
824 struct dsps_glue *glue = priv;
825 struct musb *musb = platform_get_drvdata(glue->musb);
826
827 if (!musb)
828 return IRQ_NONE;
829
830 dev_dbg(glue->dev, "VBUS interrupt\n");
831 dsps_mod_timer(glue, 0);
832
833 return IRQ_HANDLED;
834}
835
836static int dsps_setup_optional_vbus_irq(struct platform_device *pdev,
837 struct dsps_glue *glue)
838{
839 int error;
840
841 glue->vbus_irq = platform_get_irq_byname(pdev, "vbus");
842 if (glue->vbus_irq == -EPROBE_DEFER)
843 return -EPROBE_DEFER;
844
845 if (glue->vbus_irq <= 0) {
846 glue->vbus_irq = 0;
847 return 0;
848 }
849
850 error = devm_request_threaded_irq(glue->dev, glue->vbus_irq,
851 NULL, dsps_vbus_threaded_irq,
852 IRQF_SHARED,
853 "vbus", glue);
854 if (error) {
855 glue->vbus_irq = 0;
856 return error;
857 }
858 dev_dbg(glue->dev, "VBUS irq %i configured\n", glue->vbus_irq);
859
860 return 0;
861}
862
863static int dsps_probe(struct platform_device *pdev)
864{
865 const struct of_device_id *match;
866 const struct dsps_musb_wrapper *wrp;
867 struct dsps_glue *glue;
868 int ret;
869
870 if (!strcmp(pdev->name, "musb-hdrc"))
871 return -ENODEV;
872
873 match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
874 if (!match) {
875 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
876 return -EINVAL;
877 }
878 wrp = match->data;
879
880 if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
881 dsps_ops.read_fifo = dsps_read_fifo32;
882
883 /* allocate glue */
884 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
885 if (!glue)
886 return -ENOMEM;
887
888 glue->dev = &pdev->dev;
889 glue->wrp = wrp;
890 glue->usbss_base = of_iomap(pdev->dev.parent->of_node, 0);
891 if (!glue->usbss_base)
892 return -ENXIO;
893
894 platform_set_drvdata(pdev, glue);
895 pm_runtime_enable(&pdev->dev);
896 ret = dsps_create_musb_pdev(glue, pdev);
897 if (ret)
898 goto err;
899
900 if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
901 ret = dsps_setup_optional_vbus_irq(pdev, glue);
902 if (ret)
903 goto unregister_pdev;
904 }
905
906 return 0;
907
908unregister_pdev:
909 platform_device_unregister(glue->musb);
910err:
911 pm_runtime_disable(&pdev->dev);
912 iounmap(glue->usbss_base);
913 return ret;
914}
915
916static void dsps_remove(struct platform_device *pdev)
917{
918 struct dsps_glue *glue = platform_get_drvdata(pdev);
919
920 platform_device_unregister(glue->musb);
921
922 pm_runtime_disable(&pdev->dev);
923 iounmap(glue->usbss_base);
924}
925
926static const struct dsps_musb_wrapper am33xx_driver_data = {
927 .revision = 0x00,
928 .control = 0x14,
929 .status = 0x18,
930 .epintr_set = 0x38,
931 .epintr_clear = 0x40,
932 .epintr_status = 0x30,
933 .coreintr_set = 0x3c,
934 .coreintr_clear = 0x44,
935 .coreintr_status = 0x34,
936 .phy_utmi = 0xe0,
937 .mode = 0xe8,
938 .tx_mode = 0x70,
939 .rx_mode = 0x74,
940 .reset = 0,
941 .otg_disable = 21,
942 .iddig = 8,
943 .iddig_mux = 7,
944 .usb_shift = 0,
945 .usb_mask = 0x1ff,
946 .usb_bitmap = (0x1ff << 0),
947 .drvvbus = 8,
948 .txep_shift = 0,
949 .txep_mask = 0xffff,
950 .txep_bitmap = (0xffff << 0),
951 .rxep_shift = 16,
952 .rxep_mask = 0xfffe,
953 .rxep_bitmap = (0xfffe << 16),
954 .poll_timeout = 2000, /* ms */
955};
956
957static const struct of_device_id musb_dsps_of_match[] = {
958 { .compatible = "ti,musb-am33xx",
959 .data = &am33xx_driver_data, },
960 { .compatible = "ti,musb-dm816",
961 .data = &am33xx_driver_data, },
962 { },
963};
964MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
965
966#ifdef CONFIG_PM_SLEEP
967static int dsps_suspend(struct device *dev)
968{
969 struct dsps_glue *glue = dev_get_drvdata(dev);
970 const struct dsps_musb_wrapper *wrp = glue->wrp;
971 struct musb *musb = platform_get_drvdata(glue->musb);
972 void __iomem *mbase;
973 int ret;
974
975 if (!musb)
976 /* This can happen if the musb device is in -EPROBE_DEFER */
977 return 0;
978
979 ret = pm_runtime_get_sync(dev);
980 if (ret < 0) {
981 pm_runtime_put_noidle(dev);
982 return ret;
983 }
984
985 del_timer_sync(&musb->dev_timer);
986
987 mbase = musb->ctrl_base;
988 glue->context.control = musb_readl(mbase, wrp->control);
989 glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
990 glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set);
991 glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi);
992 glue->context.mode = musb_readl(mbase, wrp->mode);
993 glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
994 glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
995
996 dsps_dma_controller_suspend(glue);
997
998 return 0;
999}
1000
1001static int dsps_resume(struct device *dev)
1002{
1003 struct dsps_glue *glue = dev_get_drvdata(dev);
1004 const struct dsps_musb_wrapper *wrp = glue->wrp;
1005 struct musb *musb = platform_get_drvdata(glue->musb);
1006 void __iomem *mbase;
1007
1008 if (!musb)
1009 return 0;
1010
1011 dsps_dma_controller_resume(glue);
1012
1013 mbase = musb->ctrl_base;
1014 musb_writel(mbase, wrp->control, glue->context.control);
1015 musb_writel(mbase, wrp->epintr_set, glue->context.epintr);
1016 musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
1017 musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
1018 musb_writel(mbase, wrp->mode, glue->context.mode);
1019 musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
1020 musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
1021 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
1022 musb->port_mode == MUSB_OTG)
1023 dsps_mod_timer(glue, -1);
1024
1025 pm_runtime_put(dev);
1026
1027 return 0;
1028}
1029#endif
1030
1031static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
1032
1033static struct platform_driver dsps_usbss_driver = {
1034 .probe = dsps_probe,
1035 .remove_new = dsps_remove,
1036 .driver = {
1037 .name = "musb-dsps",
1038 .pm = &dsps_pm_ops,
1039 .of_match_table = musb_dsps_of_match,
1040 },
1041};
1042
1043MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
1044MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
1045MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
1046MODULE_LICENSE("GPL v2");
1047
1048module_platform_driver(dsps_usbss_driver);
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
52static 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 */
58static inline u8 dsps_readb(const void __iomem *addr, unsigned offset)
59{
60 return __raw_readb(addr + offset);
61}
62
63static inline u32 dsps_readl(const void __iomem *addr, unsigned offset)
64{
65 return __raw_readl(addr + offset);
66}
67
68static inline void dsps_writeb(void __iomem *addr, unsigned offset, u8 data)
69{
70 __raw_writeb(data, addr + offset);
71}
72
73static 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 */
83struct 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 unsigned poll_timeout;
123};
124
125/*
126 * register shadow for suspend
127 */
128struct 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 */
141struct 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
154static 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
172static 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->otg->state == OTG_STATE_A_WAIT_BCON)) {
183 dev_dbg(musb->controller, "%s active, deleting timer\n",
184 usb_otg_state_string(musb->xceiv->otg->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->otg->state),
205 jiffies_to_msecs(timeout - jiffies));
206 mod_timer(&glue->timer, timeout);
207}
208
209/**
210 * dsps_musb_enable - enable interrupts
211 */
212static 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 /* start polling for ID change in dual-role idle mode */
229 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
230 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
231 mod_timer(&glue->timer, jiffies +
232 msecs_to_jiffies(wrp->poll_timeout));
233 dsps_musb_try_idle(musb, 0);
234}
235
236/**
237 * dsps_musb_disable - disable HDRC and flush interrupts
238 */
239static void dsps_musb_disable(struct musb *musb)
240{
241 struct device *dev = musb->controller;
242 struct platform_device *pdev = to_platform_device(dev->parent);
243 struct dsps_glue *glue = platform_get_drvdata(pdev);
244 const struct dsps_musb_wrapper *wrp = glue->wrp;
245 void __iomem *reg_base = musb->ctrl_base;
246
247 dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
248 dsps_writel(reg_base, wrp->epintr_clear,
249 wrp->txep_bitmap | wrp->rxep_bitmap);
250 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
251}
252
253static void otg_timer(unsigned long _musb)
254{
255 struct musb *musb = (void *)_musb;
256 void __iomem *mregs = musb->mregs;
257 struct device *dev = musb->controller;
258 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
259 const struct dsps_musb_wrapper *wrp = glue->wrp;
260 u8 devctl;
261 unsigned long flags;
262 int skip_session = 0;
263
264 /*
265 * We poll because DSPS IP's won't expose several OTG-critical
266 * status change events (from the transceiver) otherwise.
267 */
268 devctl = dsps_readb(mregs, MUSB_DEVCTL);
269 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
270 usb_otg_state_string(musb->xceiv->otg->state));
271
272 spin_lock_irqsave(&musb->lock, flags);
273 switch (musb->xceiv->otg->state) {
274 case OTG_STATE_A_WAIT_BCON:
275 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
276 skip_session = 1;
277 /* fall */
278
279 case OTG_STATE_A_IDLE:
280 case OTG_STATE_B_IDLE:
281 if (devctl & MUSB_DEVCTL_BDEVICE) {
282 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
283 MUSB_DEV_MODE(musb);
284 } else {
285 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
286 MUSB_HST_MODE(musb);
287 }
288 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
289 dsps_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
290 mod_timer(&glue->timer, jiffies +
291 msecs_to_jiffies(wrp->poll_timeout));
292 break;
293 case OTG_STATE_A_WAIT_VFALL:
294 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
295 dsps_writel(musb->ctrl_base, wrp->coreintr_set,
296 MUSB_INTR_VBUSERROR << wrp->usb_shift);
297 break;
298 default:
299 break;
300 }
301 spin_unlock_irqrestore(&musb->lock, flags);
302}
303
304static irqreturn_t dsps_interrupt(int irq, void *hci)
305{
306 struct musb *musb = hci;
307 void __iomem *reg_base = musb->ctrl_base;
308 struct device *dev = musb->controller;
309 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
310 const struct dsps_musb_wrapper *wrp = glue->wrp;
311 unsigned long flags;
312 irqreturn_t ret = IRQ_NONE;
313 u32 epintr, usbintr;
314
315 spin_lock_irqsave(&musb->lock, flags);
316
317 /* Get endpoint interrupts */
318 epintr = dsps_readl(reg_base, wrp->epintr_status);
319 musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
320 musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
321
322 if (epintr)
323 dsps_writel(reg_base, wrp->epintr_status, epintr);
324
325 /* Get usb core interrupts */
326 usbintr = dsps_readl(reg_base, wrp->coreintr_status);
327 if (!usbintr && !epintr)
328 goto out;
329
330 musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
331 if (usbintr)
332 dsps_writel(reg_base, wrp->coreintr_status, usbintr);
333
334 dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
335 usbintr, epintr);
336
337 if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
338 int drvvbus = dsps_readl(reg_base, wrp->status);
339 void __iomem *mregs = musb->mregs;
340 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL);
341 int err;
342
343 err = musb->int_usb & MUSB_INTR_VBUSERROR;
344 if (err) {
345 /*
346 * The Mentor core doesn't debounce VBUS as needed
347 * to cope with device connect current spikes. This
348 * means it's not uncommon for bus-powered devices
349 * to get VBUS errors during enumeration.
350 *
351 * This is a workaround, but newer RTL from Mentor
352 * seems to allow a better one: "re"-starting sessions
353 * without waiting for VBUS to stop registering in
354 * devctl.
355 */
356 musb->int_usb &= ~MUSB_INTR_VBUSERROR;
357 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
358 mod_timer(&glue->timer, jiffies +
359 msecs_to_jiffies(wrp->poll_timeout));
360 WARNING("VBUS error workaround (delay coming)\n");
361 } else if (drvvbus) {
362 MUSB_HST_MODE(musb);
363 musb->xceiv->otg->default_a = 1;
364 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
365 del_timer(&glue->timer);
366 } else {
367 musb->is_active = 0;
368 MUSB_DEV_MODE(musb);
369 musb->xceiv->otg->default_a = 0;
370 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
371 }
372
373 /* NOTE: this must complete power-on within 100 ms. */
374 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
375 drvvbus ? "on" : "off",
376 usb_otg_state_string(musb->xceiv->otg->state),
377 err ? " ERROR" : "",
378 devctl);
379 ret = IRQ_HANDLED;
380 }
381
382 if (musb->int_tx || musb->int_rx || musb->int_usb)
383 ret |= musb_interrupt(musb);
384
385 /* Poll for ID change in OTG port mode */
386 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
387 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
388 mod_timer(&glue->timer, jiffies +
389 msecs_to_jiffies(wrp->poll_timeout));
390out:
391 spin_unlock_irqrestore(&musb->lock, flags);
392
393 return ret;
394}
395
396static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
397{
398 struct dentry *root;
399 struct dentry *file;
400 char buf[128];
401
402 sprintf(buf, "%s.dsps", dev_name(musb->controller));
403 root = debugfs_create_dir(buf, NULL);
404 if (!root)
405 return -ENOMEM;
406 glue->dbgfs_root = root;
407
408 glue->regset.regs = dsps_musb_regs;
409 glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
410 glue->regset.base = musb->ctrl_base;
411
412 file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
413 if (!file) {
414 debugfs_remove_recursive(root);
415 return -ENOMEM;
416 }
417 return 0;
418}
419
420static int dsps_musb_init(struct musb *musb)
421{
422 struct device *dev = musb->controller;
423 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
424 struct platform_device *parent = to_platform_device(dev->parent);
425 const struct dsps_musb_wrapper *wrp = glue->wrp;
426 void __iomem *reg_base;
427 struct resource *r;
428 u32 rev, val;
429 int ret;
430
431 r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
432 reg_base = devm_ioremap_resource(dev, r);
433 if (IS_ERR(reg_base))
434 return PTR_ERR(reg_base);
435 musb->ctrl_base = reg_base;
436
437 /* NOP driver needs change if supporting dual instance */
438 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
439 if (IS_ERR(musb->xceiv))
440 return PTR_ERR(musb->xceiv);
441
442 musb->phy = devm_phy_get(dev->parent, "usb2-phy");
443
444 /* Returns zero if e.g. not clocked */
445 rev = dsps_readl(reg_base, wrp->revision);
446 if (!rev)
447 return -ENODEV;
448
449 usb_phy_init(musb->xceiv);
450 if (IS_ERR(musb->phy)) {
451 musb->phy = NULL;
452 } else {
453 ret = phy_init(musb->phy);
454 if (ret < 0)
455 return ret;
456 ret = phy_power_on(musb->phy);
457 if (ret) {
458 phy_exit(musb->phy);
459 return ret;
460 }
461 }
462
463 setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
464
465 /* Reset the musb */
466 dsps_writel(reg_base, wrp->control, (1 << wrp->reset));
467
468 musb->isr = dsps_interrupt;
469
470 /* reset the otgdisable bit, needed for host mode to work */
471 val = dsps_readl(reg_base, wrp->phy_utmi);
472 val &= ~(1 << wrp->otg_disable);
473 dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
474
475 /*
476 * Check whether the dsps version has babble control enabled.
477 * In latest silicon revision the babble control logic is enabled.
478 * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
479 * logic enabled.
480 */
481 val = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
482 if (val & MUSB_BABBLE_RCV_DISABLE) {
483 glue->sw_babble_enabled = true;
484 val |= MUSB_BABBLE_SW_SESSION_CTRL;
485 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
486 }
487
488 return dsps_musb_dbg_init(musb, glue);
489}
490
491static int dsps_musb_exit(struct musb *musb)
492{
493 struct device *dev = musb->controller;
494 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
495
496 del_timer_sync(&glue->timer);
497 usb_phy_shutdown(musb->xceiv);
498 phy_power_off(musb->phy);
499 phy_exit(musb->phy);
500 debugfs_remove_recursive(glue->dbgfs_root);
501
502 return 0;
503}
504
505static int dsps_musb_set_mode(struct musb *musb, u8 mode)
506{
507 struct device *dev = musb->controller;
508 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
509 const struct dsps_musb_wrapper *wrp = glue->wrp;
510 void __iomem *ctrl_base = musb->ctrl_base;
511 u32 reg;
512
513 reg = dsps_readl(ctrl_base, wrp->mode);
514
515 switch (mode) {
516 case MUSB_HOST:
517 reg &= ~(1 << wrp->iddig);
518
519 /*
520 * if we're setting mode to host-only or device-only, we're
521 * going to ignore whatever the PHY sends us and just force
522 * ID pin status by SW
523 */
524 reg |= (1 << wrp->iddig_mux);
525
526 dsps_writel(ctrl_base, wrp->mode, reg);
527 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02);
528 break;
529 case MUSB_PERIPHERAL:
530 reg |= (1 << wrp->iddig);
531
532 /*
533 * if we're setting mode to host-only or device-only, we're
534 * going to ignore whatever the PHY sends us and just force
535 * ID pin status by SW
536 */
537 reg |= (1 << wrp->iddig_mux);
538
539 dsps_writel(ctrl_base, wrp->mode, reg);
540 break;
541 case MUSB_OTG:
542 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02);
543 break;
544 default:
545 dev_err(glue->dev, "unsupported mode %d\n", mode);
546 return -EINVAL;
547 }
548
549 return 0;
550}
551
552static bool dsps_sw_babble_control(struct musb *musb)
553{
554 u8 babble_ctl;
555 bool session_restart = false;
556
557 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
558 dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
559 babble_ctl);
560 /*
561 * check line monitor flag to check whether babble is
562 * due to noise
563 */
564 dev_dbg(musb->controller, "STUCK_J is %s\n",
565 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
566
567 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
568 int timeout = 10;
569
570 /*
571 * babble is due to noise, then set transmit idle (d7 bit)
572 * to resume normal operation
573 */
574 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
575 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
576 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
577
578 /* wait till line monitor flag cleared */
579 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
580 do {
581 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL);
582 udelay(1);
583 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
584
585 /* check whether stuck_at_j bit cleared */
586 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
587 /*
588 * real babble condition has occurred
589 * restart the controller to start the
590 * session again
591 */
592 dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
593 babble_ctl);
594 session_restart = true;
595 }
596 } else {
597 session_restart = true;
598 }
599
600 return session_restart;
601}
602
603static int dsps_musb_recover(struct musb *musb)
604{
605 struct device *dev = musb->controller;
606 struct dsps_glue *glue = dev_get_drvdata(dev->parent);
607 int session_restart = 0;
608
609 if (glue->sw_babble_enabled)
610 session_restart = dsps_sw_babble_control(musb);
611 else
612 session_restart = 1;
613
614 return session_restart ? 0 : -EPIPE;
615}
616
617/* Similar to am35x, dm81xx support only 32-bit read operation */
618static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
619{
620 void __iomem *fifo = hw_ep->fifo;
621
622 if (len >= 4) {
623 ioread32_rep(fifo, dst, len >> 2);
624 dst += len & ~0x03;
625 len &= 0x03;
626 }
627
628 /* Read any remaining 1 to 3 bytes */
629 if (len > 0) {
630 u32 val = musb_readl(fifo, 0);
631 memcpy(dst, &val, len);
632 }
633}
634
635static struct musb_platform_ops dsps_ops = {
636 .quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
637 .init = dsps_musb_init,
638 .exit = dsps_musb_exit,
639
640#ifdef CONFIG_USB_TI_CPPI41_DMA
641 .dma_init = cppi41_dma_controller_create,
642 .dma_exit = cppi41_dma_controller_destroy,
643#endif
644 .enable = dsps_musb_enable,
645 .disable = dsps_musb_disable,
646
647 .try_idle = dsps_musb_try_idle,
648 .set_mode = dsps_musb_set_mode,
649 .recover = dsps_musb_recover,
650};
651
652static u64 musb_dmamask = DMA_BIT_MASK(32);
653
654static int get_int_prop(struct device_node *dn, const char *s)
655{
656 int ret;
657 u32 val;
658
659 ret = of_property_read_u32(dn, s, &val);
660 if (ret)
661 return 0;
662 return val;
663}
664
665static int get_musb_port_mode(struct device *dev)
666{
667 enum usb_dr_mode mode;
668
669 mode = usb_get_dr_mode(dev);
670 switch (mode) {
671 case USB_DR_MODE_HOST:
672 return MUSB_PORT_MODE_HOST;
673
674 case USB_DR_MODE_PERIPHERAL:
675 return MUSB_PORT_MODE_GADGET;
676
677 case USB_DR_MODE_UNKNOWN:
678 case USB_DR_MODE_OTG:
679 default:
680 return MUSB_PORT_MODE_DUAL_ROLE;
681 }
682}
683
684static int dsps_create_musb_pdev(struct dsps_glue *glue,
685 struct platform_device *parent)
686{
687 struct musb_hdrc_platform_data pdata;
688 struct resource resources[2];
689 struct resource *res;
690 struct device *dev = &parent->dev;
691 struct musb_hdrc_config *config;
692 struct platform_device *musb;
693 struct device_node *dn = parent->dev.of_node;
694 int ret, val;
695
696 memset(resources, 0, sizeof(resources));
697 res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
698 if (!res) {
699 dev_err(dev, "failed to get memory.\n");
700 return -EINVAL;
701 }
702 resources[0] = *res;
703
704 res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
705 if (!res) {
706 dev_err(dev, "failed to get irq.\n");
707 return -EINVAL;
708 }
709 resources[1] = *res;
710
711 /* allocate the child platform device */
712 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
713 if (!musb) {
714 dev_err(dev, "failed to allocate musb device\n");
715 return -ENOMEM;
716 }
717
718 musb->dev.parent = dev;
719 musb->dev.dma_mask = &musb_dmamask;
720 musb->dev.coherent_dma_mask = musb_dmamask;
721
722 glue->musb = musb;
723
724 ret = platform_device_add_resources(musb, resources,
725 ARRAY_SIZE(resources));
726 if (ret) {
727 dev_err(dev, "failed to add resources\n");
728 goto err;
729 }
730
731 config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
732 if (!config) {
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
746 ret = of_property_read_u32(dn, "mentor,multipoint", &val);
747 if (!ret && val)
748 config->multipoint = true;
749
750 config->maximum_speed = usb_get_maximum_speed(&parent->dev);
751 switch (config->maximum_speed) {
752 case USB_SPEED_LOW:
753 case USB_SPEED_FULL:
754 break;
755 case USB_SPEED_SUPER:
756 dev_warn(dev, "ignore incorrect maximum_speed "
757 "(super-speed) setting in dts");
758 /* fall through */
759 default:
760 config->maximum_speed = USB_SPEED_HIGH;
761 }
762
763 ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
764 if (ret) {
765 dev_err(dev, "failed to add platform_data\n");
766 goto err;
767 }
768
769 ret = platform_device_add(musb);
770 if (ret) {
771 dev_err(dev, "failed to register musb device\n");
772 goto err;
773 }
774 return 0;
775
776err:
777 platform_device_put(musb);
778 return ret;
779}
780
781static int dsps_probe(struct platform_device *pdev)
782{
783 const struct of_device_id *match;
784 const struct dsps_musb_wrapper *wrp;
785 struct dsps_glue *glue;
786 int ret;
787
788 if (!strcmp(pdev->name, "musb-hdrc"))
789 return -ENODEV;
790
791 match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
792 if (!match) {
793 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
794 return -EINVAL;
795 }
796 wrp = match->data;
797
798 if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
799 dsps_ops.read_fifo = dsps_read_fifo32;
800
801 /* allocate glue */
802 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
803 if (!glue)
804 return -ENOMEM;
805
806 glue->dev = &pdev->dev;
807 glue->wrp = wrp;
808
809 platform_set_drvdata(pdev, glue);
810 pm_runtime_enable(&pdev->dev);
811
812 ret = pm_runtime_get_sync(&pdev->dev);
813 if (ret < 0) {
814 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
815 goto err2;
816 }
817
818 ret = dsps_create_musb_pdev(glue, pdev);
819 if (ret)
820 goto err3;
821
822 return 0;
823
824err3:
825 pm_runtime_put(&pdev->dev);
826err2:
827 pm_runtime_disable(&pdev->dev);
828 return ret;
829}
830
831static int dsps_remove(struct platform_device *pdev)
832{
833 struct dsps_glue *glue = platform_get_drvdata(pdev);
834
835 platform_device_unregister(glue->musb);
836
837 /* disable usbss clocks */
838 pm_runtime_put(&pdev->dev);
839 pm_runtime_disable(&pdev->dev);
840
841 return 0;
842}
843
844static const struct dsps_musb_wrapper am33xx_driver_data = {
845 .revision = 0x00,
846 .control = 0x14,
847 .status = 0x18,
848 .epintr_set = 0x38,
849 .epintr_clear = 0x40,
850 .epintr_status = 0x30,
851 .coreintr_set = 0x3c,
852 .coreintr_clear = 0x44,
853 .coreintr_status = 0x34,
854 .phy_utmi = 0xe0,
855 .mode = 0xe8,
856 .tx_mode = 0x70,
857 .rx_mode = 0x74,
858 .reset = 0,
859 .otg_disable = 21,
860 .iddig = 8,
861 .iddig_mux = 7,
862 .usb_shift = 0,
863 .usb_mask = 0x1ff,
864 .usb_bitmap = (0x1ff << 0),
865 .drvvbus = 8,
866 .txep_shift = 0,
867 .txep_mask = 0xffff,
868 .txep_bitmap = (0xffff << 0),
869 .rxep_shift = 16,
870 .rxep_mask = 0xfffe,
871 .rxep_bitmap = (0xfffe << 16),
872 .poll_timeout = 2000, /* ms */
873};
874
875static const struct of_device_id musb_dsps_of_match[] = {
876 { .compatible = "ti,musb-am33xx",
877 .data = &am33xx_driver_data, },
878 { .compatible = "ti,musb-dm816",
879 .data = &am33xx_driver_data, },
880 { },
881};
882MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
883
884#ifdef CONFIG_PM_SLEEP
885static int dsps_suspend(struct device *dev)
886{
887 struct dsps_glue *glue = dev_get_drvdata(dev);
888 const struct dsps_musb_wrapper *wrp = glue->wrp;
889 struct musb *musb = platform_get_drvdata(glue->musb);
890 void __iomem *mbase;
891
892 del_timer_sync(&glue->timer);
893
894 if (!musb)
895 /* This can happen if the musb device is in -EPROBE_DEFER */
896 return 0;
897
898 mbase = musb->ctrl_base;
899 glue->context.control = dsps_readl(mbase, wrp->control);
900 glue->context.epintr = dsps_readl(mbase, wrp->epintr_set);
901 glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set);
902 glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi);
903 glue->context.mode = dsps_readl(mbase, wrp->mode);
904 glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode);
905 glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode);
906
907 return 0;
908}
909
910static int dsps_resume(struct device *dev)
911{
912 struct dsps_glue *glue = dev_get_drvdata(dev);
913 const struct dsps_musb_wrapper *wrp = glue->wrp;
914 struct musb *musb = platform_get_drvdata(glue->musb);
915 void __iomem *mbase;
916
917 if (!musb)
918 return 0;
919
920 mbase = musb->ctrl_base;
921 dsps_writel(mbase, wrp->control, glue->context.control);
922 dsps_writel(mbase, wrp->epintr_set, glue->context.epintr);
923 dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
924 dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
925 dsps_writel(mbase, wrp->mode, glue->context.mode);
926 dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
927 dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
928 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
929 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
930 mod_timer(&glue->timer, jiffies +
931 msecs_to_jiffies(wrp->poll_timeout));
932
933 return 0;
934}
935#endif
936
937static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
938
939static struct platform_driver dsps_usbss_driver = {
940 .probe = dsps_probe,
941 .remove = dsps_remove,
942 .driver = {
943 .name = "musb-dsps",
944 .pm = &dsps_pm_ops,
945 .of_match_table = musb_dsps_of_match,
946 },
947};
948
949MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
950MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
951MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
952MODULE_LICENSE("GPL v2");
953
954module_platform_driver(dsps_usbss_driver);