/* * drivers/usb/gadget/dwc2_udc_otg.c * Designware DWC2 on-chip full/high speed USB OTG 2.0 device controllers * * Copyright (C) 2008 for Samsung Electronics * * BSP Support for Samsung's UDC driver * available at: * git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git * * State machine bugfixes: * Marek Szyprowski <m.szyprowski@samsung.com> * * Ported to u-boot: * Marek Szyprowski <m.szyprowski@samsung.com> * Lukasz Majewski <l.majewski@samsumg.com> * * SPDX-License-Identifier: GPL-2.0+ */ #undef DEBUG #include <common.h> #include <asm/errno.h> #include <linux/list.h> #include <malloc.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> #include <asm/byteorder.h> #include <asm/unaligned.h> #include <asm/io.h> #include <asm/mach-types.h> #include "dwc2_udc_otg_regs.h" #include "dwc2_udc_otg_priv.h" #include <usb/lin_gadget_compat.h> /***********************************************************/ #define OTG_DMA_MODE 1 #define DEBUG_SETUP 0 #define DEBUG_EP0 0 #define DEBUG_ISR 0 #define DEBUG_OUT_EP 0 #define DEBUG_IN_EP 0 #include <usb/dwc2_udc.h> #define EP0_CON 0 #define EP_MASK 0xF static char *state_names[] = { "WAIT_FOR_SETUP", "DATA_STATE_XMIT", "DATA_STATE_NEED_ZLP", "WAIT_FOR_OUT_STATUS", "DATA_STATE_RECV", "WAIT_FOR_COMPLETE", "WAIT_FOR_OUT_COMPLETE", "WAIT_FOR_IN_COMPLETE", "WAIT_FOR_NULL_COMPLETE", }; #define DRIVER_DESC "DWC2 HS USB OTG Device Driver, (c) Samsung Electronics" #define DRIVER_VERSION "15 March 2009" struct dwc2_udc *the_controller; static const char driver_name[] = "dwc2-udc"; static const char driver_desc[] = DRIVER_DESC; static const char ep0name[] = "ep0-control"; /* Max packet size*/ static unsigned int ep0_fifo_size = 64; static unsigned int ep_fifo_size = 512; static unsigned int ep_fifo_size2 = 1024; static int reset_available = 1; static struct usb_ctrlrequest *usb_ctrl; static dma_addr_t usb_ctrl_dma_addr; /* Local declarations. */ static int dwc2_ep_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *); static int dwc2_ep_disable(struct usb_ep *ep); static struct usb_request *dwc2_alloc_request(struct usb_ep *ep, gfp_t gfp_flags); static void dwc2_free_request(struct usb_ep *ep, struct usb_request *); static int dwc2_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags); static int dwc2_dequeue(struct usb_ep *ep, struct usb_request *); static int dwc2_fifo_status(struct usb_ep *ep); static void dwc2_fifo_flush(struct usb_ep *ep); static void dwc2_ep0_read(struct dwc2_udc *dev); static void dwc2_ep0_kick(struct dwc2_udc *dev, struct dwc2_ep *ep); static void dwc2_handle_ep0(struct dwc2_udc *dev); static int dwc2_ep0_write(struct dwc2_udc *dev); static int write_fifo_ep0(struct dwc2_ep *ep, struct dwc2_request *req); static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status); static void stop_activity(struct dwc2_udc *dev, struct usb_gadget_driver *driver); static int udc_enable(struct dwc2_udc *dev); static void udc_set_address(struct dwc2_udc *dev, unsigned char address); static void reconfig_usbd(struct dwc2_udc *dev); static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed); static void nuke(struct dwc2_ep *ep, int status); static int dwc2_udc_set_halt(struct usb_ep *_ep, int value); static void dwc2_udc_set_nak(struct dwc2_ep *ep); void set_udc_gadget_private_data(void *p) { debug_cond(DEBUG_SETUP != 0, "%s: the_controller: 0x%p, p: 0x%p\n", __func__, the_controller, p); the_controller->gadget.dev.device_data = p; } void *get_udc_gadget_private_data(struct usb_gadget *gadget) { return gadget->dev.device_data; } static struct usb_ep_ops dwc2_ep_ops = { .enable = dwc2_ep_enable, .disable = dwc2_ep_disable, .alloc_request = dwc2_alloc_request, .free_request = dwc2_free_request, .queue = dwc2_queue, .dequeue = dwc2_dequeue, .set_halt = dwc2_udc_set_halt, .fifo_status = dwc2_fifo_status, .fifo_flush = dwc2_fifo_flush, }; #define create_proc_files() do {} while (0) #define remove_proc_files() do {} while (0) /***********************************************************/ void __iomem *regs_otg; struct dwc2_usbotg_reg *reg; bool dfu_usb_get_reset(void) { return !!(readl(®->gintsts) & INT_RESET); } __weak void otg_phy_init(struct dwc2_udc *dev) {} __weak void otg_phy_off(struct dwc2_udc *dev) {} /***********************************************************/ #include "dwc2_udc_otg_xfer_dma.c" /* * udc_disable - disable USB device controller */ static void udc_disable(struct dwc2_udc *dev) { debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev); udc_set_address(dev, 0); dev->ep0state = WAIT_FOR_SETUP; dev->gadget.speed = USB_SPEED_UNKNOWN; dev->usb_address = 0; otg_phy_off(dev); } /* * udc_reinit - initialize software state */ static void udc_reinit(struct dwc2_udc *dev) { unsigned int i; debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev); /* device/ep0 records init */ INIT_LIST_HEAD(&dev->gadget.ep_list); INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); dev->ep0state = WAIT_FOR_SETUP; /* basic endpoint records init */ for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) { struct dwc2_ep *ep = &dev->ep[i]; if (i != 0) list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list); ep->desc = 0; ep->stopped = 0; INIT_LIST_HEAD(&ep->queue); ep->pio_irqs = 0; } /* the rest was statically initialized, and is read-only */ } #define BYTES2MAXP(x) (x / 8) #define MAXP2BYTES(x) (x * 8) /* until it's enabled, this UDC should be completely invisible * to any USB host. */ static int udc_enable(struct dwc2_udc *dev) { debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev); otg_phy_init(dev); reconfig_usbd(dev); debug_cond(DEBUG_SETUP != 0, "DWC2 USB 2.0 OTG Controller Core Initialized : 0x%x\n", readl(®->gintmsk)); dev->gadget.speed = USB_SPEED_UNKNOWN; return 0; } /* Register entry point for the peripheral controller driver. */ int usb_gadget_register_driver(struct usb_gadget_driver *driver) { struct dwc2_udc *dev = the_controller; int retval = 0; unsigned long flags = 0; debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name"); if (!driver || (driver->speed != USB_SPEED_FULL && driver->speed != USB_SPEED_HIGH) || !driver->bind || !driver->disconnect || !driver->setup) return -EINVAL; if (!dev) return -ENODEV; if (dev->driver) return -EBUSY; spin_lock_irqsave(&dev->lock, flags); /* first hook up the driver ... */ dev->driver = driver; spin_unlock_irqrestore(&dev->lock, flags); if (retval) { /* TODO */ printf("target device_add failed, error %d\n", retval); return retval; } retval = driver->bind(&dev->gadget); if (retval) { debug_cond(DEBUG_SETUP != 0, "%s: bind to driver --> error %d\n", dev->gadget.name, retval); dev->driver = 0; return retval; } enable_irq(IRQ_OTG); debug_cond(DEBUG_SETUP != 0, "Registered gadget driver %s\n", dev->gadget.name); udc_enable(dev); return 0; } /* * Unregister entry point for the peripheral controller driver. */ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) { struct dwc2_udc *dev = the_controller; unsigned long flags = 0; if (!dev) return -ENODEV; if (!driver || driver != dev->driver) return -EINVAL; spin_lock_irqsave(&dev->lock, flags); dev->driver = 0; stop_activity(dev, driver); spin_unlock_irqrestore(&dev->lock, flags); driver->unbind(&dev->gadget); disable_irq(IRQ_OTG); udc_disable(dev); return 0; } /* * done - retire a request; caller blocked irqs */ static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status) { unsigned int stopped = ep->stopped; debug("%s: %s %p, req = %p, stopped = %d\n", __func__, ep->ep.name, ep, &req->req, stopped); list_del_init(&req->queue); if (likely(req->req.status == -EINPROGRESS)) req->req.status = status; else status = req->req.status; if (status && status != -ESHUTDOWN) { debug("complete %s req %p stat %d len %u/%u\n", ep->ep.name, &req->req, status, req->req.actual, req->req.length); } /* don't modify queue heads during completion callback */ ep->stopped = 1; #ifdef DEBUG printf("calling complete callback\n"); { int i, len = req->req.length; printf("pkt[%d] = ", req->req.length); if (len > 64) len = 64; for (i = 0; i < len; i++) { printf("%02x", ((u8 *)req->req.buf)[i]); if ((i & 7) == 7) printf(" "); } printf("\n"); } #endif spin_unlock(&ep->dev->lock); req->req.complete(&ep->ep, &req->req); spin_lock(&ep->dev->lock); debug("callback completed\n"); ep->stopped = stopped; } /* * nuke - dequeue ALL requests */ static void nuke(struct dwc2_ep *ep, int status) { struct dwc2_request *req; debug("%s: %s %p\n", __func__, ep->ep.name, ep); /* called with irqs blocked */ while (!list_empty(&ep->queue)) { req = list_entry(ep->queue.next, struct dwc2_request, queue); done(ep, req, status); } } static void stop_activity(struct dwc2_udc *dev, struct usb_gadget_driver *driver) { int i; /* don't disconnect drivers more than once */ if (dev->gadget.speed == USB_SPEED_UNKNOWN) driver = 0; dev->gadget.speed = USB_SPEED_UNKNOWN; /* prevent new request submissions, kill any outstanding requests */ for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) { struct dwc2_ep *ep = &dev->ep[i]; ep->stopped = 1; nuke(ep, -ESHUTDOWN); } /* report disconnect; the driver is already quiesced */ if (driver) { spin_unlock(&dev->lock); driver->disconnect(&dev->gadget); spin_lock(&dev->lock); } /* re-init driver-visible data structures */ udc_reinit(dev); } static void reconfig_usbd(struct dwc2_udc *dev) { /* 2. Soft-reset OTG Core and then unreset again. */ int i; unsigned int uTemp = writel(CORE_SOFT_RESET, ®->grstctl); uint32_t dflt_gusbcfg; debug("Reseting OTG controller\n"); dflt_gusbcfg = 0<<15 /* PHY Low Power Clock sel*/ |1<<14 /* Non-Periodic TxFIFO Rewind Enable*/ |0x5<<10 /* Turnaround time*/ |0<<9 | 0<<8 /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/ /* 1:SRP enable] H1= 1,1*/ |0<<7 /* Ulpi DDR sel*/ |0<<6 /* 0: high speed utmi+, 1: full speed serial*/ |0<<4 /* 0: utmi+, 1:ulpi*/ |1<<3 /* phy i/f 0:8bit, 1:16bit*/ |0x7<<0; /* HS/FS Timeout**/ if (dev->pdata->usb_gusbcfg) dflt_gusbcfg = dev->pdata->usb_gusbcfg; writel(dflt_gusbcfg, ®->gusbcfg); /* 3. Put the OTG device core in the disconnected state.*/ uTemp = readl(®->dctl); uTemp |= SOFT_DISCONNECT; writel(uTemp, ®->dctl); udelay(20); /* 4. Make the OTG device core exit from the disconnected state.*/ uTemp = readl(®->dctl); uTemp = uTemp & ~SOFT_DISCONNECT; writel(uTemp, ®->dctl); /* 5. Configure OTG Core to initial settings of device mode.*/ /* [][1: full speed(30Mhz) 0:high speed]*/ writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, ®->dcfg); mdelay(1); /* 6. Unmask the core interrupts*/ writel(GINTMSK_INIT, ®->gintmsk); /* 7. Set NAK bit of EP0, EP1, EP2*/ writel(DEPCTL_EPDIS|DEPCTL_SNAK, ®->out_endp[EP0_CON].doepctl); writel(DEPCTL_EPDIS|DEPCTL_SNAK, ®->in_endp[EP0_CON].diepctl); for (i = 1; i < DWC2_MAX_ENDPOINTS; i++) { writel(DEPCTL_EPDIS|DEPCTL_SNAK, ®->out_endp[i].doepctl); writel(DEPCTL_EPDIS|DEPCTL_SNAK, ®->in_endp[i].diepctl); } /* 8. Unmask EPO interrupts*/ writel(((1 << EP0_CON) << DAINT_OUT_BIT) | (1 << EP0_CON), ®->daintmsk); /* 9. Unmask device OUT EP common interrupts*/ writel(DOEPMSK_INIT, ®->doepmsk); /* 10. Unmask device IN EP common interrupts*/ writel(DIEPMSK_INIT, ®->diepmsk); /* 11. Set Rx FIFO Size (in 32-bit words) */ writel(RX_FIFO_SIZE >> 2, ®->grxfsiz); /* 12. Set Non Periodic Tx FIFO Size */ writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0, ®->gnptxfsiz); for (i = 1; i < DWC2_MAX_HW_ENDPOINTS; i++) writel((PTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE + NPTX_FIFO_SIZE + PTX_FIFO_SIZE*(i-1)) >> 2) << 0, ®->dieptxf[i-1]); /* Flush the RX FIFO */ writel(RX_FIFO_FLUSH, ®->grstctl); while (readl(®->grstctl) & RX_FIFO_FLUSH) debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__); /* Flush all the Tx FIFO's */ writel(TX_FIFO_FLUSH_ALL, ®->grstctl); writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, ®->grstctl); while (readl(®->grstctl) & TX_FIFO_FLUSH) debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__); /* 13. Clear NAK bit of EP0, EP1, EP2*/ /* For Slave mode*/ /* EP0: Control OUT */ writel(DEPCTL_EPDIS | DEPCTL_CNAK, ®->out_endp[EP0_CON].doepctl); /* 14. Initialize OTG Link Core.*/ writel(GAHBCFG_INIT, ®->gahbcfg); } static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed) { unsigned int ep_ctrl; int i; if (speed == USB_SPEED_HIGH) { ep0_fifo_size = 64; ep_fifo_size = 512; ep_fifo_size2 = 1024; dev->gadget.speed = USB_SPEED_HIGH; } else { ep0_fifo_size = 64; ep_fifo_size = 64; ep_fifo_size2 = 64; dev->gadget.speed = USB_SPEED_FULL; } dev->ep[0].ep.maxpacket = ep0_fifo_size; for (i = 1; i < DWC2_MAX_ENDPOINTS; i++) dev->ep[i].ep.maxpacket = ep_fifo_size; /* EP0 - Control IN (64 bytes)*/ ep_ctrl = readl(®->in_endp[EP0_CON].diepctl); writel(ep_ctrl|(0<<0), ®->in_endp[EP0_CON].diepctl); /* EP0 - Control OUT (64 bytes)*/ ep_ctrl = readl(®->out_endp[EP0_CON].doepctl); writel(ep_ctrl|(0<<0), ®->out_endp[EP0_CON].doepctl); } static int dwc2_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) { struct dwc2_ep *ep; struct dwc2_udc *dev; unsigned long flags = 0; debug("%s: %p\n", __func__, _ep); ep = container_of(_ep, struct dwc2_ep, ep); if (!_ep || !desc || ep->desc || _ep->name == ep0name || desc->bDescriptorType != USB_DT_ENDPOINT || ep->bEndpointAddress != desc->bEndpointAddress || ep_maxpacket(ep) < le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) { debug("%s: bad ep or descriptor\n", __func__); return -EINVAL; } /* xfer types must match, except that interrupt ~= bulk */ if (ep->bmAttributes != desc->bmAttributes && ep->bmAttributes != USB_ENDPOINT_XFER_BULK && desc->bmAttributes != USB_ENDPOINT_XFER_INT) { debug("%s: %s type mismatch\n", __func__, _ep->name); return -EINVAL; } /* hardware _could_ do smaller, but driver doesn't */ if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) != ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) { debug("%s: bad %s maxpacket\n", __func__, _ep->name); return -ERANGE; } dev = ep->dev; if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { debug("%s: bogus device state\n", __func__); return -ESHUTDOWN; } ep->stopped = 0; ep->desc = desc; ep->pio_irqs = 0; ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)); /* Reset halt state */ dwc2_udc_set_nak(ep); dwc2_udc_set_halt(_ep, 0); spin_lock_irqsave(&ep->dev->lock, flags); dwc2_udc_ep_activate(ep); spin_unlock_irqrestore(&ep->dev->lock, flags); debug("%s: enabled %s, stopped = %d, maxpacket = %d\n", __func__, _ep->name, ep->stopped, ep->ep.maxpacket); return 0; } /* * Disable EP */ static int dwc2_ep_disable(struct usb_ep *_ep) { struct dwc2_ep *ep; unsigned long flags = 0; debug("%s: %p\n", __func__, _ep); ep = container_of(_ep, struct dwc2_ep, ep); if (!_ep || !ep->desc) { debug("%s: %s not enabled\n", __func__, _ep ? ep->ep.name : NULL); return -EINVAL; } spin_lock_irqsave(&ep->dev->lock, flags); /* Nuke all pending requests */ nuke(ep, -ESHUTDOWN); ep->desc = 0; ep->stopped = 1; spin_unlock_irqrestore(&ep->dev->lock, flags); debug("%s: disabled %s\n", __func__, _ep->name); return 0; } static struct usb_request *dwc2_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) { struct dwc2_request *req; debug("%s: %s %p\n", __func__, ep->name, ep); req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req)); if (!req) return 0; memset(req, 0, sizeof *req); INIT_LIST_HEAD(&req->queue); return &req->req; } static void dwc2_free_request(struct usb_ep *ep, struct usb_request *_req) { struct dwc2_request *req; debug("%s: %p\n", __func__, ep); req = container_of(_req, struct dwc2_request, req); WARN_ON(!list_empty(&req->queue)); kfree(req); } /* dequeue JUST ONE request */ static int dwc2_dequeue(struct usb_ep *_ep, struct usb_request *_req) { struct dwc2_ep *ep; struct dwc2_request *req; unsigned long flags = 0; debug("%s: %p\n", __func__, _ep); ep = container_of(_ep, struct dwc2_ep, ep); if (!_ep || ep->ep.name == ep0name) return -EINVAL; spin_lock_irqsave(&ep->dev->lock, flags); /* make sure it's actually queued on this endpoint */ list_for_each_entry(req, &ep->queue, queue) { if (&req->req == _req) break; } if (&req->req != _req) { spin_unlock_irqrestore(&ep->dev->lock, flags); return -EINVAL; } done(ep, req, -ECONNRESET); spin_unlock_irqrestore(&ep->dev->lock, flags); return 0; } /* * Return bytes in EP FIFO */ static int dwc2_fifo_status(struct usb_ep *_ep) { int count = 0; struct dwc2_ep *ep; ep = container_of(_ep, struct dwc2_ep, ep); if (!_ep) { debug("%s: bad ep\n", __func__); return -ENODEV; } debug("%s: %d\n", __func__, ep_index(ep)); /* LPD can't report unclaimed bytes from IN fifos */ if (ep_is_in(ep)) return -EOPNOTSUPP; return count; } /* * Flush EP FIFO */ static void dwc2_fifo_flush(struct usb_ep *_ep) { struct dwc2_ep *ep; ep = container_of(_ep, struct dwc2_ep, ep); if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) { debug("%s: bad ep\n", __func__); return; } debug("%s: %d\n", __func__, ep_index(ep)); } static const struct usb_gadget_ops dwc2_udc_ops = { /* current versions must always be self-powered */ }; static struct dwc2_udc memory = { .usb_address = 0, .gadget = { .ops = &dwc2_udc_ops, .ep0 = &memory.ep[0].ep, .name = driver_name, }, /* control endpoint */ .ep[0] = { .ep = { .name = ep0name, .ops = &dwc2_ep_ops, .maxpacket = EP0_FIFO_SIZE, }, .dev = &memory, .bEndpointAddress = 0, .bmAttributes = 0, .ep_type = ep_control, }, /* first group of endpoints */ .ep[1] = { .ep = { .name = "ep1in-bulk", .ops = &dwc2_ep_ops, .maxpacket = EP_FIFO_SIZE, }, .dev = &memory, .bEndpointAddress = USB_DIR_IN | 1, .bmAttributes = USB_ENDPOINT_XFER_BULK, .ep_type = ep_bulk_out, .fifo_num = 1, }, .ep[2] = { .ep = { .name = "ep2out-bulk", .ops = &dwc2_ep_ops, .maxpacket = EP_FIFO_SIZE, }, .dev = &memory, .bEndpointAddress = USB_DIR_OUT | 2, .bmAttributes = USB_ENDPOINT_XFER_BULK, .ep_type = ep_bulk_in, .fifo_num = 2, }, .ep[3] = { .ep = { .name = "ep3in-int", .ops = &dwc2_ep_ops, .maxpacket = EP_FIFO_SIZE, }, .dev = &memory, .bEndpointAddress = USB_DIR_IN | 3, .bmAttributes = USB_ENDPOINT_XFER_INT, .ep_type = ep_interrupt, .fifo_num = 3, }, }; /* * probe - binds to the platform device */ int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata) { struct dwc2_udc *dev = &memory; int retval = 0; debug("%s: %p\n", __func__, pdata); dev->pdata = pdata; reg = (struct dwc2_usbotg_reg *)pdata->regs_otg; /* regs_otg = (void *)pdata->regs_otg; */ dev->gadget.is_dualspeed = 1; /* Hack only*/ dev->gadget.is_otg = 0; dev->gadget.is_a_peripheral = 0; dev->gadget.b_hnp_enable = 0; dev->gadget.a_hnp_support = 0; dev->gadget.a_alt_hnp_support = 0; the_controller = dev; usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE, ROUND(sizeof(struct usb_ctrlrequest), CONFIG_SYS_CACHELINE_SIZE)); if (!usb_ctrl) { error("No memory available for UDC!\n"); return -ENOMEM; } usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl; udc_reinit(dev); return retval; } int usb_gadget_handle_interrupts(int index) { u32 intr_status = readl(®->gintsts); u32 gintmsk = readl(®->gintmsk); if (intr_status & gintmsk) return dwc2_udc_irq(1, (void *)the_controller); return 0; }