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/platform_device.h>
51 #include <linux/module.h>
52 #include <linux/idr.h>
53 #include <linux/interrupt.h>
55 #include <linux/kernel.h>
56 #include <linux/slab.h>
57 #include <linux/pm_runtime.h>
58 #include <linux/usb/ch9.h>
59 #include <linux/usb/gadget.h>
60 #include <linux/usb/otg.h>
61 #include <linux/usb/chipidea.h>
62 #include <linux/usb/of.h>
64 #include <linux/phy.h>
65 #include <linux/regulator/consumer.h>
75 /* Controller register map */
76 static const u8 ci_regs_nolpm[] = {
77 [CAP_CAPLENGTH] = 0x00U,
78 [CAP_HCCPARAMS] = 0x08U,
79 [CAP_DCCPARAMS] = 0x24U,
80 [CAP_TESTMODE] = 0x38U,
84 [OP_DEVICEADDR] = 0x14U,
85 [OP_ENDPTLISTADDR] = 0x18U,
90 [OP_ENDPTSETUPSTAT] = 0x6CU,
91 [OP_ENDPTPRIME] = 0x70U,
92 [OP_ENDPTFLUSH] = 0x74U,
93 [OP_ENDPTSTAT] = 0x78U,
94 [OP_ENDPTCOMPLETE] = 0x7CU,
95 [OP_ENDPTCTRL] = 0x80U,
98 static const u8 ci_regs_lpm[] = {
99 [CAP_CAPLENGTH] = 0x00U,
100 [CAP_HCCPARAMS] = 0x08U,
101 [CAP_DCCPARAMS] = 0x24U,
102 [CAP_TESTMODE] = 0xFCU,
105 [OP_USBINTR] = 0x08U,
106 [OP_DEVICEADDR] = 0x14U,
107 [OP_ENDPTLISTADDR] = 0x18U,
111 [OP_USBMODE] = 0xC8U,
112 [OP_ENDPTSETUPSTAT] = 0xD8U,
113 [OP_ENDPTPRIME] = 0xDCU,
114 [OP_ENDPTFLUSH] = 0xE0U,
115 [OP_ENDPTSTAT] = 0xE4U,
116 [OP_ENDPTCOMPLETE] = 0xE8U,
117 [OP_ENDPTCTRL] = 0xECU,
120 static int hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
124 for (i = 0; i < OP_ENDPTCTRL; i++)
125 ci->hw_bank.regmap[i] =
126 (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
127 (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
129 for (; i <= OP_LAST; i++)
130 ci->hw_bank.regmap[i] = ci->hw_bank.op +
131 4 * (i - OP_ENDPTCTRL) +
133 ? ci_regs_lpm[OP_ENDPTCTRL]
134 : ci_regs_nolpm[OP_ENDPTCTRL]);
140 * hw_read_intr_enable: returns interrupt enable register
142 * @ci: the controller
144 * This function returns register data
146 u32 hw_read_intr_enable(struct ci_hdrc *ci)
148 return hw_read(ci, OP_USBINTR, ~0);
152 * hw_read_intr_status: returns interrupt status register
154 * @ci: the controller
156 * This function returns register data
158 u32 hw_read_intr_status(struct ci_hdrc *ci)
160 return hw_read(ci, OP_USBSTS, ~0);
164 * hw_port_test_set: writes port test mode (execute without interruption)
167 * This function returns an error code
169 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
171 const u8 TEST_MODE_MAX = 7;
173 if (mode > TEST_MODE_MAX)
176 hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
181 * hw_port_test_get: reads port test mode value
183 * @ci: the controller
185 * This function returns port test mode value
187 u8 hw_port_test_get(struct ci_hdrc *ci)
189 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
192 /* The PHY enters/leaves low power mode */
193 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
195 enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
196 bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
198 if (enable && !lpm) {
199 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
200 PORTSC_PHCD(ci->hw_bank.lpm));
201 } else if (!enable && lpm) {
202 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
205 * the PHY needs some time (less
206 * than 1ms) to leave low power mode.
208 usleep_range(1000, 1100);
212 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
216 /* bank is a module variable */
217 ci->hw_bank.abs = base;
219 ci->hw_bank.cap = ci->hw_bank.abs;
220 ci->hw_bank.cap += ci->platdata->capoffset;
221 ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
223 hw_alloc_regmap(ci, false);
224 reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
225 __ffs(HCCPARAMS_LEN);
226 ci->hw_bank.lpm = reg;
228 hw_alloc_regmap(ci, !!reg);
229 ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
230 ci->hw_bank.size += OP_LAST;
231 ci->hw_bank.size /= sizeof(u32);
233 reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
234 __ffs(DCCPARAMS_DEN);
235 ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
237 if (ci->hw_ep_max > ENDPT_MAX)
240 ci_hdrc_enter_lpm(ci, false);
242 /* Disable all interrupts bits */
243 hw_write(ci, OP_USBINTR, 0xffffffff, 0);
245 /* Clear all interrupts status bits*/
246 hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
248 dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
249 ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
251 /* setup lock mode ? */
253 /* ENDPTSETUPSTAT is '0' by default */
255 /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
260 static void hw_phymode_configure(struct ci_hdrc *ci)
262 u32 portsc, lpm, sts = 0;
264 switch (ci->platdata->phy_mode) {
265 case USBPHY_INTERFACE_MODE_UTMI:
266 portsc = PORTSC_PTS(PTS_UTMI);
267 lpm = DEVLC_PTS(PTS_UTMI);
269 case USBPHY_INTERFACE_MODE_UTMIW:
270 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
271 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
273 case USBPHY_INTERFACE_MODE_ULPI:
274 portsc = PORTSC_PTS(PTS_ULPI);
275 lpm = DEVLC_PTS(PTS_ULPI);
277 case USBPHY_INTERFACE_MODE_SERIAL:
278 portsc = PORTSC_PTS(PTS_SERIAL);
279 lpm = DEVLC_PTS(PTS_SERIAL);
282 case USBPHY_INTERFACE_MODE_HSIC:
283 portsc = PORTSC_PTS(PTS_HSIC);
284 lpm = DEVLC_PTS(PTS_HSIC);
290 if (ci->hw_bank.lpm) {
291 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
293 hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
295 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
297 hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
302 * ci_usb_phy_init: initialize phy according to different phy type
303 * @ci: the controller
305 * This function returns an error code if usb_phy_init has failed
307 static int ci_usb_phy_init(struct ci_hdrc *ci)
311 switch (ci->platdata->phy_mode) {
312 case USBPHY_INTERFACE_MODE_UTMI:
313 case USBPHY_INTERFACE_MODE_UTMIW:
314 case USBPHY_INTERFACE_MODE_HSIC:
315 ret = usb_phy_init(ci->transceiver);
318 hw_phymode_configure(ci);
320 case USBPHY_INTERFACE_MODE_ULPI:
321 case USBPHY_INTERFACE_MODE_SERIAL:
322 hw_phymode_configure(ci);
323 ret = usb_phy_init(ci->transceiver);
328 ret = usb_phy_init(ci->transceiver);
335 * hw_device_reset: resets chip (execute without interruption)
336 * @ci: the controller
338 * This function returns an error code
340 int hw_device_reset(struct ci_hdrc *ci, u32 mode)
342 /* should flush & stop before reset */
343 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
344 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
346 hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
347 while (hw_read(ci, OP_USBCMD, USBCMD_RST))
348 udelay(10); /* not RTOS friendly */
350 if (ci->platdata->notify_event)
351 ci->platdata->notify_event(ci,
352 CI_HDRC_CONTROLLER_RESET_EVENT);
354 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
355 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
357 if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
359 hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
361 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
364 /* USBMODE should be configured step by step */
365 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
366 hw_write(ci, OP_USBMODE, USBMODE_CM, mode);
368 hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
370 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != mode) {
371 pr_err("cannot enter in %s mode", ci_role(ci)->name);
372 pr_err("lpm = %i", ci->hw_bank.lpm);
380 * hw_wait_reg: wait the register value
382 * Sometimes, it needs to wait register value before going on.
383 * Eg, when switch to device mode, the vbus value should be lower
384 * than OTGSC_BSV before connects to host.
386 * @ci: the controller
387 * @reg: register index
389 * @value: the bit value to wait
390 * @timeout_ms: timeout in millisecond
392 * This function returns an error code if timeout
394 int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
395 u32 value, unsigned int timeout_ms)
397 unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms);
399 while (hw_read(ci, reg, mask) != value) {
400 if (time_after(jiffies, elapse)) {
401 dev_err(ci->dev, "timeout waiting for %08x in %d\n",
411 static irqreturn_t ci_irq(int irq, void *data)
413 struct ci_hdrc *ci = data;
414 irqreturn_t ret = IRQ_NONE;
418 otgsc = hw_read_otgsc(ci, ~0);
419 if (ci_otg_is_fsm_mode(ci)) {
420 ret = ci_otg_fsm_irq(ci);
421 if (ret == IRQ_HANDLED)
427 * Handle id change interrupt, it indicates device/host function
430 if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
432 /* Clear ID change irq status */
433 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
434 ci_otg_queue_work(ci);
439 * Handle vbus change interrupt, it indicates device connection
440 * and disconnection events.
442 if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
443 ci->b_sess_valid_event = true;
445 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
446 ci_otg_queue_work(ci);
450 /* Handle device/host interrupt */
451 if (ci->role != CI_ROLE_END)
452 ret = ci_role(ci)->irq(ci);
457 static int ci_get_platdata(struct device *dev,
458 struct ci_hdrc_platform_data *platdata)
460 if (!platdata->phy_mode)
461 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
463 if (!platdata->dr_mode)
464 platdata->dr_mode = of_usb_get_dr_mode(dev->of_node);
466 if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
467 platdata->dr_mode = USB_DR_MODE_OTG;
469 if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
470 /* Get the vbus regulator */
471 platdata->reg_vbus = devm_regulator_get(dev, "vbus");
472 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
473 return -EPROBE_DEFER;
474 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
475 /* no vbus regualator is needed */
476 platdata->reg_vbus = NULL;
477 } else if (IS_ERR(platdata->reg_vbus)) {
478 dev_err(dev, "Getting regulator error: %ld\n",
479 PTR_ERR(platdata->reg_vbus));
480 return PTR_ERR(platdata->reg_vbus);
482 /* Get TPL support */
483 if (!platdata->tpl_support)
484 platdata->tpl_support =
485 of_usb_host_tpl_support(dev->of_node);
488 if (of_usb_get_maximum_speed(dev->of_node) == USB_SPEED_FULL)
489 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
494 static DEFINE_IDA(ci_ida);
496 struct platform_device *ci_hdrc_add_device(struct device *dev,
497 struct resource *res, int nres,
498 struct ci_hdrc_platform_data *platdata)
500 struct platform_device *pdev;
503 ret = ci_get_platdata(dev, platdata);
507 id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
511 pdev = platform_device_alloc("ci_hdrc", id);
517 pdev->dev.parent = dev;
518 pdev->dev.dma_mask = dev->dma_mask;
519 pdev->dev.dma_parms = dev->dma_parms;
520 dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
522 ret = platform_device_add_resources(pdev, res, nres);
526 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
530 ret = platform_device_add(pdev);
537 platform_device_put(pdev);
539 ida_simple_remove(&ci_ida, id);
542 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
544 void ci_hdrc_remove_device(struct platform_device *pdev)
547 platform_device_unregister(pdev);
548 ida_simple_remove(&ci_ida, id);
550 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
552 static inline void ci_role_destroy(struct ci_hdrc *ci)
554 ci_hdrc_gadget_destroy(ci);
555 ci_hdrc_host_destroy(ci);
557 ci_hdrc_otg_destroy(ci);
560 static void ci_get_otg_capable(struct ci_hdrc *ci)
562 if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
565 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
566 DCCPARAMS_DC | DCCPARAMS_HC)
567 == (DCCPARAMS_DC | DCCPARAMS_HC));
569 dev_dbg(ci->dev, "It is OTG capable controller\n");
572 static int ci_hdrc_probe(struct platform_device *pdev)
574 struct device *dev = &pdev->dev;
576 struct resource *res;
579 enum usb_dr_mode dr_mode;
581 if (!dev_get_platdata(dev)) {
582 dev_err(dev, "platform data missing\n");
586 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
587 base = devm_ioremap_resource(dev, res);
589 return PTR_ERR(base);
591 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
593 dev_err(dev, "can't allocate device\n");
598 ci->platdata = dev_get_platdata(dev);
599 ci->imx28_write_fix = !!(ci->platdata->flags &
600 CI_HDRC_IMX28_WRITE_FIX);
602 ret = hw_device_init(ci, base);
604 dev_err(dev, "can't initialize hardware\n");
608 if (ci->platdata->phy)
609 ci->transceiver = ci->platdata->phy;
611 ci->transceiver = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
613 if (IS_ERR(ci->transceiver)) {
614 ret = PTR_ERR(ci->transceiver);
616 * if -ENXIO is returned, it means PHY layer wasn't
617 * enabled, so it makes no sense to return -EPROBE_DEFER
618 * in that case, since no PHY driver will ever probe.
623 dev_err(dev, "no usb2 phy configured\n");
624 return -EPROBE_DEFER;
627 ret = ci_usb_phy_init(ci);
629 dev_err(dev, "unable to init phy: %d\n", ret);
633 * The delay to sync PHY's status, the maximum delay is
634 * 2ms since the otgsc uses 1ms timer to debounce the
637 usleep_range(2000, 2500);
640 ci->hw_bank.phys = res->start;
642 ci->irq = platform_get_irq(pdev, 0);
644 dev_err(dev, "missing IRQ\n");
649 ci_get_otg_capable(ci);
651 dr_mode = ci->platdata->dr_mode;
652 /* initialize role(s) before the interrupt is requested */
653 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
654 ret = ci_hdrc_host_init(ci);
656 dev_info(dev, "doesn't support host\n");
659 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
660 ret = ci_hdrc_gadget_init(ci);
662 dev_info(dev, "doesn't support gadget\n");
665 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
666 dev_err(dev, "no supported roles\n");
671 if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
672 /* Disable and clear all OTG irq */
673 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
674 OTGSC_INT_STATUS_BITS);
675 ret = ci_hdrc_otg_init(ci);
677 dev_err(dev, "init otg fails, ret = %d\n", ret);
682 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
684 ci->role = ci_otg_role(ci);
685 /* Enable ID change irq */
686 hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
689 * If the controller is not OTG capable, but support
690 * role switch, the defalt role is gadget, and the
691 * user can switch it through debugfs.
693 ci->role = CI_ROLE_GADGET;
696 ci->role = ci->roles[CI_ROLE_HOST]
701 /* only update vbus status for peripheral */
702 if (ci->role == CI_ROLE_GADGET)
703 ci_handle_vbus_change(ci);
705 if (!ci_otg_is_fsm_mode(ci)) {
706 ret = ci_role_start(ci, ci->role);
708 dev_err(dev, "can't start %s role\n",
714 platform_set_drvdata(pdev, ci);
715 ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->platdata->name,
720 if (ci_otg_is_fsm_mode(ci))
721 ci_hdrc_otg_fsm_start(ci);
723 ret = dbg_create_files(ci);
727 free_irq(ci->irq, ci);
731 usb_phy_shutdown(ci->transceiver);
736 static int ci_hdrc_remove(struct platform_device *pdev)
738 struct ci_hdrc *ci = platform_get_drvdata(pdev);
740 dbg_remove_files(ci);
741 free_irq(ci->irq, ci);
743 ci_hdrc_enter_lpm(ci, true);
744 usb_phy_shutdown(ci->transceiver);
745 kfree(ci->hw_bank.regmap);
750 static struct platform_driver ci_hdrc_driver = {
751 .probe = ci_hdrc_probe,
752 .remove = ci_hdrc_remove,
755 .owner = THIS_MODULE,
759 module_platform_driver(ci_hdrc_driver);
761 MODULE_ALIAS("platform:ci_hdrc");
762 MODULE_LICENSE("GPL v2");
764 MODULE_DESCRIPTION("ChipIdea HDRC Driver");