2 * core.c - ChipIdea USB IP core family device controller
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 * Description: ChipIdea USB IP core family device controller
16 * This driver is composed of several blocks:
17 * - HW: hardware interface
18 * - DBG: debug facilities (optional)
20 * - ISR: interrupts handling
21 * - ENDPT: endpoint operations (Gadget API)
22 * - GADGET: gadget operations (Gadget API)
23 * - BUS: bus glue code, bus abstraction layer
26 * - CONFIG_USB_CHIPIDEA_DEBUG: enable debug facilities
27 * - STALL_IN: non-empty bulk-in pipes cannot be halted
28 * if defined mass storage compliance succeeds but with warnings
32 * if undefined usbtest 13 fails
33 * - TRACE: enable function tracing (depends on DEBUG)
36 * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
37 * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
38 * - Normal & LPM support
41 * - OK: 0-12, 13 (STALL_IN defined) & 14
42 * - Not Supported: 15 & 16 (ISO)
45 * - Suspend & Remote Wakeup
47 #include <linux/delay.h>
48 #include <linux/device.h>
49 #include <linux/dma-mapping.h>
50 #include <linux/phy/phy.h>
51 #include <linux/platform_device.h>
52 #include <linux/module.h>
53 #include <linux/idr.h>
54 #include <linux/interrupt.h>
56 #include <linux/kernel.h>
57 #include <linux/slab.h>
58 #include <linux/pm_runtime.h>
59 #include <linux/usb/ch9.h>
60 #include <linux/usb/gadget.h>
61 #include <linux/usb/otg.h>
62 #include <linux/usb/chipidea.h>
63 #include <linux/usb/of.h>
65 #include <linux/phy.h>
66 #include <linux/regulator/consumer.h>
76 /* Controller register map */
77 static const u8 ci_regs_nolpm[] = {
78 [CAP_CAPLENGTH] = 0x00U,
79 [CAP_HCCPARAMS] = 0x08U,
80 [CAP_DCCPARAMS] = 0x24U,
81 [CAP_TESTMODE] = 0x38U,
85 [OP_DEVICEADDR] = 0x14U,
86 [OP_ENDPTLISTADDR] = 0x18U,
91 [OP_ENDPTSETUPSTAT] = 0x6CU,
92 [OP_ENDPTPRIME] = 0x70U,
93 [OP_ENDPTFLUSH] = 0x74U,
94 [OP_ENDPTSTAT] = 0x78U,
95 [OP_ENDPTCOMPLETE] = 0x7CU,
96 [OP_ENDPTCTRL] = 0x80U,
99 static const u8 ci_regs_lpm[] = {
100 [CAP_CAPLENGTH] = 0x00U,
101 [CAP_HCCPARAMS] = 0x08U,
102 [CAP_DCCPARAMS] = 0x24U,
103 [CAP_TESTMODE] = 0xFCU,
106 [OP_USBINTR] = 0x08U,
107 [OP_DEVICEADDR] = 0x14U,
108 [OP_ENDPTLISTADDR] = 0x18U,
112 [OP_USBMODE] = 0xC8U,
113 [OP_ENDPTSETUPSTAT] = 0xD8U,
114 [OP_ENDPTPRIME] = 0xDCU,
115 [OP_ENDPTFLUSH] = 0xE0U,
116 [OP_ENDPTSTAT] = 0xE4U,
117 [OP_ENDPTCOMPLETE] = 0xE8U,
118 [OP_ENDPTCTRL] = 0xECU,
121 static int hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
125 for (i = 0; i < OP_ENDPTCTRL; i++)
126 ci->hw_bank.regmap[i] =
127 (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
128 (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
130 for (; i <= OP_LAST; i++)
131 ci->hw_bank.regmap[i] = ci->hw_bank.op +
132 4 * (i - OP_ENDPTCTRL) +
134 ? ci_regs_lpm[OP_ENDPTCTRL]
135 : ci_regs_nolpm[OP_ENDPTCTRL]);
141 * hw_read_intr_enable: returns interrupt enable register
143 * @ci: the controller
145 * This function returns register data
147 u32 hw_read_intr_enable(struct ci_hdrc *ci)
149 return hw_read(ci, OP_USBINTR, ~0);
153 * hw_read_intr_status: returns interrupt status register
155 * @ci: the controller
157 * This function returns register data
159 u32 hw_read_intr_status(struct ci_hdrc *ci)
161 return hw_read(ci, OP_USBSTS, ~0);
165 * hw_port_test_set: writes port test mode (execute without interruption)
168 * This function returns an error code
170 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
172 const u8 TEST_MODE_MAX = 7;
174 if (mode > TEST_MODE_MAX)
177 hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
182 * hw_port_test_get: reads port test mode value
184 * @ci: the controller
186 * This function returns port test mode value
188 u8 hw_port_test_get(struct ci_hdrc *ci)
190 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
193 /* The PHY enters/leaves low power mode */
194 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
196 enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
197 bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
200 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
201 PORTSC_PHCD(ci->hw_bank.lpm));
202 else if (!enable && lpm)
203 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
207 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
211 /* bank is a module variable */
212 ci->hw_bank.abs = base;
214 ci->hw_bank.cap = ci->hw_bank.abs;
215 ci->hw_bank.cap += ci->platdata->capoffset;
216 ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
218 hw_alloc_regmap(ci, false);
219 reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
220 __ffs(HCCPARAMS_LEN);
221 ci->hw_bank.lpm = reg;
223 hw_alloc_regmap(ci, !!reg);
224 ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
225 ci->hw_bank.size += OP_LAST;
226 ci->hw_bank.size /= sizeof(u32);
228 reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
229 __ffs(DCCPARAMS_DEN);
230 ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
232 if (ci->hw_ep_max > ENDPT_MAX)
235 ci_hdrc_enter_lpm(ci, false);
237 /* Disable all interrupts bits */
238 hw_write(ci, OP_USBINTR, 0xffffffff, 0);
240 /* Clear all interrupts status bits*/
241 hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
243 dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
244 ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
246 /* setup lock mode ? */
248 /* ENDPTSETUPSTAT is '0' by default */
250 /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
255 static void hw_phymode_configure(struct ci_hdrc *ci)
257 u32 portsc, lpm, sts = 0;
259 switch (ci->platdata->phy_mode) {
260 case USBPHY_INTERFACE_MODE_UTMI:
261 portsc = PORTSC_PTS(PTS_UTMI);
262 lpm = DEVLC_PTS(PTS_UTMI);
264 case USBPHY_INTERFACE_MODE_UTMIW:
265 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
266 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
268 case USBPHY_INTERFACE_MODE_ULPI:
269 portsc = PORTSC_PTS(PTS_ULPI);
270 lpm = DEVLC_PTS(PTS_ULPI);
272 case USBPHY_INTERFACE_MODE_SERIAL:
273 portsc = PORTSC_PTS(PTS_SERIAL);
274 lpm = DEVLC_PTS(PTS_SERIAL);
277 case USBPHY_INTERFACE_MODE_HSIC:
278 portsc = PORTSC_PTS(PTS_HSIC);
279 lpm = DEVLC_PTS(PTS_HSIC);
285 if (ci->hw_bank.lpm) {
286 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
288 hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
290 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
292 hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
297 * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
299 * @ci: the controller
301 * This function returns an error code if the phy failed to init
303 static int _ci_usb_phy_init(struct ci_hdrc *ci)
308 ret = phy_init(ci->phy);
312 ret = phy_power_on(ci->phy);
318 ret = usb_phy_init(ci->usb_phy);
325 * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
327 * @ci: the controller
329 static void ci_usb_phy_exit(struct ci_hdrc *ci)
332 phy_power_off(ci->phy);
335 usb_phy_shutdown(ci->usb_phy);
340 * ci_usb_phy_init: initialize phy according to different phy type
341 * @ci: the controller
343 * This function returns an error code if usb_phy_init has failed
345 static int ci_usb_phy_init(struct ci_hdrc *ci)
349 switch (ci->platdata->phy_mode) {
350 case USBPHY_INTERFACE_MODE_UTMI:
351 case USBPHY_INTERFACE_MODE_UTMIW:
352 case USBPHY_INTERFACE_MODE_HSIC:
353 ret = _ci_usb_phy_init(ci);
356 hw_phymode_configure(ci);
358 case USBPHY_INTERFACE_MODE_ULPI:
359 case USBPHY_INTERFACE_MODE_SERIAL:
360 hw_phymode_configure(ci);
361 ret = _ci_usb_phy_init(ci);
366 ret = _ci_usb_phy_init(ci);
373 * hw_device_reset: resets chip (execute without interruption)
374 * @ci: the controller
376 * This function returns an error code
378 int hw_device_reset(struct ci_hdrc *ci, u32 mode)
380 /* should flush & stop before reset */
381 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
382 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
384 hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
385 while (hw_read(ci, OP_USBCMD, USBCMD_RST))
386 udelay(10); /* not RTOS friendly */
388 if (ci->platdata->notify_event)
389 ci->platdata->notify_event(ci,
390 CI_HDRC_CONTROLLER_RESET_EVENT);
392 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
393 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
395 if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
397 hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
399 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
402 /* USBMODE should be configured step by step */
403 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
404 hw_write(ci, OP_USBMODE, USBMODE_CM, mode);
406 hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
408 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != mode) {
409 pr_err("cannot enter in %s mode", ci_role(ci)->name);
410 pr_err("lpm = %i", ci->hw_bank.lpm);
418 * hw_wait_reg: wait the register value
420 * Sometimes, it needs to wait register value before going on.
421 * Eg, when switch to device mode, the vbus value should be lower
422 * than OTGSC_BSV before connects to host.
424 * @ci: the controller
425 * @reg: register index
427 * @value: the bit value to wait
428 * @timeout_ms: timeout in millisecond
430 * This function returns an error code if timeout
432 int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
433 u32 value, unsigned int timeout_ms)
435 unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms);
437 while (hw_read(ci, reg, mask) != value) {
438 if (time_after(jiffies, elapse)) {
439 dev_err(ci->dev, "timeout waiting for %08x in %d\n",
449 static irqreturn_t ci_irq(int irq, void *data)
451 struct ci_hdrc *ci = data;
452 irqreturn_t ret = IRQ_NONE;
456 otgsc = hw_read_otgsc(ci, ~0);
457 if (ci_otg_is_fsm_mode(ci)) {
458 ret = ci_otg_fsm_irq(ci);
459 if (ret == IRQ_HANDLED)
465 * Handle id change interrupt, it indicates device/host function
468 if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
470 /* Clear ID change irq status */
471 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
472 ci_otg_queue_work(ci);
477 * Handle vbus change interrupt, it indicates device connection
478 * and disconnection events.
480 if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
481 ci->b_sess_valid_event = true;
483 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
484 ci_otg_queue_work(ci);
488 /* Handle device/host interrupt */
489 if (ci->role != CI_ROLE_END)
490 ret = ci_role(ci)->irq(ci);
495 static int ci_get_platdata(struct device *dev,
496 struct ci_hdrc_platform_data *platdata)
498 if (!platdata->phy_mode)
499 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
501 if (!platdata->dr_mode)
502 platdata->dr_mode = of_usb_get_dr_mode(dev->of_node);
504 if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
505 platdata->dr_mode = USB_DR_MODE_OTG;
507 if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
508 /* Get the vbus regulator */
509 platdata->reg_vbus = devm_regulator_get(dev, "vbus");
510 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
511 return -EPROBE_DEFER;
512 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
513 /* no vbus regualator is needed */
514 platdata->reg_vbus = NULL;
515 } else if (IS_ERR(platdata->reg_vbus)) {
516 dev_err(dev, "Getting regulator error: %ld\n",
517 PTR_ERR(platdata->reg_vbus));
518 return PTR_ERR(platdata->reg_vbus);
520 /* Get TPL support */
521 if (!platdata->tpl_support)
522 platdata->tpl_support =
523 of_usb_host_tpl_support(dev->of_node);
526 if (of_usb_get_maximum_speed(dev->of_node) == USB_SPEED_FULL)
527 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
532 static DEFINE_IDA(ci_ida);
534 struct platform_device *ci_hdrc_add_device(struct device *dev,
535 struct resource *res, int nres,
536 struct ci_hdrc_platform_data *platdata)
538 struct platform_device *pdev;
541 ret = ci_get_platdata(dev, platdata);
545 id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
549 pdev = platform_device_alloc("ci_hdrc", id);
555 pdev->dev.parent = dev;
556 pdev->dev.dma_mask = dev->dma_mask;
557 pdev->dev.dma_parms = dev->dma_parms;
558 dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
560 ret = platform_device_add_resources(pdev, res, nres);
564 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
568 ret = platform_device_add(pdev);
575 platform_device_put(pdev);
577 ida_simple_remove(&ci_ida, id);
580 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
582 void ci_hdrc_remove_device(struct platform_device *pdev)
585 platform_device_unregister(pdev);
586 ida_simple_remove(&ci_ida, id);
588 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
590 static inline void ci_role_destroy(struct ci_hdrc *ci)
592 ci_hdrc_gadget_destroy(ci);
593 ci_hdrc_host_destroy(ci);
595 ci_hdrc_otg_destroy(ci);
598 static void ci_get_otg_capable(struct ci_hdrc *ci)
600 if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
603 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
604 DCCPARAMS_DC | DCCPARAMS_HC)
605 == (DCCPARAMS_DC | DCCPARAMS_HC));
607 dev_dbg(ci->dev, "It is OTG capable controller\n");
610 static int ci_hdrc_probe(struct platform_device *pdev)
612 struct device *dev = &pdev->dev;
614 struct resource *res;
617 enum usb_dr_mode dr_mode;
619 if (!dev_get_platdata(dev)) {
620 dev_err(dev, "platform data missing\n");
624 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
625 base = devm_ioremap_resource(dev, res);
627 return PTR_ERR(base);
629 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
634 ci->platdata = dev_get_platdata(dev);
635 ci->imx28_write_fix = !!(ci->platdata->flags &
636 CI_HDRC_IMX28_WRITE_FIX);
638 ret = hw_device_init(ci, base);
640 dev_err(dev, "can't initialize hardware\n");
644 if (ci->platdata->phy) {
645 ci->phy = ci->platdata->phy;
646 } else if (ci->platdata->usb_phy) {
647 ci->usb_phy = ci->platdata->usb_phy;
649 ci->phy = devm_phy_get(dev, "usb-phy");
650 ci->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
652 /* if both generic PHY and USB PHY layers aren't enabled */
653 if (PTR_ERR(ci->phy) == -ENOSYS &&
654 PTR_ERR(ci->usb_phy) == -ENXIO)
657 if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy))
658 return -EPROBE_DEFER;
662 else if (IS_ERR(ci->usb_phy))
666 ret = ci_usb_phy_init(ci);
668 dev_err(dev, "unable to init phy: %d\n", ret);
672 * The delay to sync PHY's status, the maximum delay is
673 * 2ms since the otgsc uses 1ms timer to debounce the
676 usleep_range(2000, 2500);
679 ci->hw_bank.phys = res->start;
681 ci->irq = platform_get_irq(pdev, 0);
683 dev_err(dev, "missing IRQ\n");
688 ci_get_otg_capable(ci);
690 dr_mode = ci->platdata->dr_mode;
691 /* initialize role(s) before the interrupt is requested */
692 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
693 ret = ci_hdrc_host_init(ci);
695 dev_info(dev, "doesn't support host\n");
698 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
699 ret = ci_hdrc_gadget_init(ci);
701 dev_info(dev, "doesn't support gadget\n");
704 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
705 dev_err(dev, "no supported roles\n");
710 if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
711 /* Disable and clear all OTG irq */
712 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
713 OTGSC_INT_STATUS_BITS);
714 ret = ci_hdrc_otg_init(ci);
716 dev_err(dev, "init otg fails, ret = %d\n", ret);
721 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
723 ci->role = ci_otg_role(ci);
724 /* Enable ID change irq */
725 hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
728 * If the controller is not OTG capable, but support
729 * role switch, the defalt role is gadget, and the
730 * user can switch it through debugfs.
732 ci->role = CI_ROLE_GADGET;
735 ci->role = ci->roles[CI_ROLE_HOST]
740 /* only update vbus status for peripheral */
741 if (ci->role == CI_ROLE_GADGET)
742 ci_handle_vbus_change(ci);
744 if (!ci_otg_is_fsm_mode(ci)) {
745 ret = ci_role_start(ci, ci->role);
747 dev_err(dev, "can't start %s role\n",
753 platform_set_drvdata(pdev, ci);
754 ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
755 ci->platdata->name, ci);
759 if (ci_otg_is_fsm_mode(ci))
760 ci_hdrc_otg_fsm_start(ci);
762 ret = dbg_create_files(ci);
774 static int ci_hdrc_remove(struct platform_device *pdev)
776 struct ci_hdrc *ci = platform_get_drvdata(pdev);
778 dbg_remove_files(ci);
780 ci_hdrc_enter_lpm(ci, true);
786 static struct platform_driver ci_hdrc_driver = {
787 .probe = ci_hdrc_probe,
788 .remove = ci_hdrc_remove,
791 .owner = THIS_MODULE,
795 module_platform_driver(ci_hdrc_driver);
797 MODULE_ALIAS("platform:ci_hdrc");
798 MODULE_LICENSE("GPL v2");
799 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
800 MODULE_DESCRIPTION("ChipIdea HDRC Driver");