/******************************************************************************* * arch/arm/src/lpc17xx/lpc17_usbhost.c * * Copyright (C) 2010 Gregory Nutt. All rights reserved. * Authors: Rafael Noronha * Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * *******************************************************************************/ /******************************************************************************* * Included Files *******************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "lpc17_internal.h" /* Includes default GPIO settings */ #include /* May redefine GPIO settings */ #include "chip.h" #include "up_arch.h" #include "up_internal.h" #include "lpc17_usb.h" #include "lpc17_syscon.h" #include "lpc17_ohciram.h" /******************************************************************************* * Definitions *******************************************************************************/ /* All I/O buffers must lie in AHB SRAM because of the OHCI DMA. It might be * okay if no I/O buffers are used *IF* the application can guarantee that all * end-user I/O buffers reside in AHB SRAM. */ #if LPC17_IOBUFFERS < 1 # warning "No IO buffers allocated" #endif /* Frame Interval / Periodic Start */ #define FI (12000-1) /* 12000 bits per frame (-1) */ #define FSMPS ((6 * (FI - 210)) / 7) #define DEFAULT_FMINTERVAL ((FSMPS << OHCI_FMINT_FSMPS_SHIFT) | FI) #define DEFAULT_PERSTART ((9 * FI) / 10) /* CLKCTRL enable bits */ #define LPC17_CLKCTRL_ENABLES (USBOTG_CLK_HOSTCLK|USBOTG_CLK_PORTSELCLK|USBOTG_CLK_AHBCLK) /* Interrupt enable bits */ #ifdef CONFIG_DEBUG_USB # define LPC17_DEBUG_INTS (OHCI_INT_SO|OHCI_INT_RD|OHCI_INT_UE|OHCI_INT_OC) #else # define LPC17_DEBUG_INTS 0 #endif #define LPC17_NORMAL_INTS (OHCI_INT_WDH|OHCI_INT_RHSC) #define LPC17_ALL_INTS (LPC17_NORMAL_INTS|LPC17_DEBUG_INTS) /* Dump GPIO registers */ #if defined(CONFIG_LPC17_USBHOST_REGDEBUG) && defined(CONFIG_DEBUG_GPIO) # define usbhost_dumpgpio() \ do { \ lpc17_dumpgpio(GPIO_USB_DP, "D+ P0.29; D- P0.30"); \ lpc17_dumpgpio(GPIO_USB_UPLED, "LED P1:18; PPWR P1:19 PWRD P1:22 PVRCR P1:27"); \ } while (0); #else # define usbhost_dumpgpio() #endif /* USB Host Memory *************************************************************/ /* Helper definitions */ #define HCCA ((volatile struct ohci_hcca_s *)LPC17_HCCA_BASE) #define TDHEAD ((volatile struct ohci_gtd_s *)LPC17_TDHEAD_ADDR) #define TDTAIL ((volatile struct ohci_gtd_s *)LPC17_TDTAIL_ADDR) #define EDCTRL ((volatile struct ohci_ed_s *)LPC17_EDCTRL_ADDR) #define EDFREE ((struct ohci_ed_s *)LPC17_EDFREE_BASE) #define TDFREE ((uint8_t *)LPC17_TDFREE_BASE) #define IOFREE ((uint8_t *)LPC17_IOFREE_BASE) /* Descriptors *****************************************************************/ /* TD delay interrupt value */ #define TD_DELAY(n) (uint32_t)((n) << GTD_STATUS_DI_SHIFT) /******************************************************************************* * Private Types *******************************************************************************/ /* This structure retains the state of the USB host controller */ struct lpc17_usbhost_s { /* Common device fields. This must be the first thing defined in the * structure so that it is possible to simply cast from struct usbhost_s * to structlpc17_usbhost_s. */ struct usbhost_driver_s drvr; /* The bound device class driver */ struct usbhost_class_s *class; /* Driver status */ volatile uint8_t tdstatus; /* TD control status bits from last Writeback Done Head event */ volatile bool connected; /* Connected to device */ volatile bool rhswait; /* TRUE: Thread is waiting for Root Hub Status change */ volatile bool wdhwait; /* TRUE: Thread is waiting for WDH interrupt */ sem_t rhssem; /* Semaphore to wait Writeback Done Head event */ sem_t wdhsem; /* Semaphore used to wait for Writeback Done Head event */ }; /* The following are used to manage lists of free EDs and TD buffers*/ struct lpc17_edlist_s { struct lpc17_edlist_s *flink; /* Link to next ED in the list */ uint32_t pad[3]; /* To make the same size as struct ohci_ed_s */ }; struct lpc17_buflist_s { struct lpc17_buflist_s *flink; /* Link to next buffer in the list */ /* Variable length buffer data follows */ }; /******************************************************************************* * Private Function Prototypes *******************************************************************************/ /* Register operations ********************************************************/ #ifdef CONFIG_LPC17_USBHOST_REGDEBUG static void lpc17_printreg(uint32_t addr, uint32_t val, bool iswrite); static void lpc17_checkreg(uint32_t addr, uint32_t val, bool iswrite); static uint32_t lpc17_getreg(uint32_t addr); static void lpc17_putreg(uint32_t val, uint32_t addr); #else # define lpc17_getreg(addr) getreg32(addr) # define lpc17_putreg(val,addr) putreg32(val,addr) #endif /* Semaphores ******************************************************************/ static void lpc17_takesem(sem_t *sem); #define lpc17_givesem(s) sem_post(s); /* Byte stream access helper functions *****************************************/ static inline uint16_t lpc17_getle16(const uint8_t *val); static void lpc17_putle16(uint8_t *dest, uint16_t val); /* Descriptor helper functions *************************************************/ static uint8_t *lpc17_tdalloc(struct lpc17_usbhost_s *priv); static void lpc17_tdfree(struct lpc17_usbhost_s *priv, uint8_t *buffer); #if LPC17_IOBUFFERS > 0 static uint8_t *lpc17_ioalloc(struct lpc17_usbhost_s *priv); static void lpc17_iofree(struct lpc17_usbhost_s *priv, uint8_t *buffer); #endif static void lpc17_enqueuetd(volatile struct ohci_ed_s *ed, uint32_t dirpid, uint32_t toggle, volatile uint8_t *buffer, size_t buflen); static int lpc17_ctrltd(struct lpc17_usbhost_s *priv, uint32_t dirpid, uint8_t *buffer, size_t buflen); /* Interrupt handling **********************************************************/ static int lpc17_usbinterrupt(int irq, FAR void *context); /* USB host controller operations **********************************************/ static int lpc17_wait(FAR struct usbhost_driver_s *drvr, bool connected); static int lpc17_enumerate(FAR struct usbhost_driver_s *drvr); static int lpc17_ep0configure(FAR struct usbhost_driver_s *drvr, uint8_t funcaddr, uint16_t maxpacketsize); static int lpc17_epalloc(FAR struct usbhost_driver_s *drvr, const FAR struct usbhost_epdesc_s *epdesc, usbhost_ep_t *ep); static int lpc17_epfree(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep); static int lpc17_alloc(FAR struct usbhost_driver_s *drvr, FAR uint8_t **buffer, FAR size_t *maxlen); static int lpc17_free(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer); static int lpc17_ctrlin(FAR struct usbhost_driver_s *drvr, FAR const struct usb_ctrlreq_s *req, FAR uint8_t *buffer); static int lpc17_ctrlout(FAR struct usbhost_driver_s *drvr, FAR const struct usb_ctrlreq_s *req, FAR const uint8_t *buffer); static int lpc17_transfer(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep, FAR uint8_t *buffer, size_t buflen); static void lpc17_disconnect(FAR struct usbhost_driver_s *drvr); /* Initializaion ***************************************************************/ static void lpc17_tdinit(volatile struct ohci_gtd_s *td); static void lpc17_edinit(volatile struct ohci_ed_s *ed); static void lpc17_hccainit(volatile struct ohci_hcca_s *hcca); /******************************************************************************* * Private Data *******************************************************************************/ /* In this driver implementation, support is provided for only a single a single * USB device. All status information can be simply retained in a single global * instance. */ static struct lpc17_usbhost_s g_usbhost = { .drvr = { .wait = lpc17_wait, .enumerate = lpc17_enumerate, .ep0configure = lpc17_ep0configure, .epalloc = lpc17_epalloc, .epfree = lpc17_epfree, .alloc = lpc17_alloc, .free = lpc17_free, .ctrlin = lpc17_ctrlin, .ctrlout = lpc17_ctrlout, .transfer = lpc17_transfer, .disconnect = lpc17_disconnect, }, .class = NULL, }; /* This is a free list of EDs and TD buffers */ static struct lpc17_edlist_s *g_edfree; static struct lpc17_buflist_s *g_tdfree; #if LPC17_IOBUFFERS > 0 static struct lpc17_buflist_s *g_iofree; #endif /******************************************************************************* * Public Data *******************************************************************************/ /******************************************************************************* * Private Functions *******************************************************************************/ /******************************************************************************* * Name: lpc17_printreg * * Description: * Print the contents of an LPC17xx register operation * *******************************************************************************/ #ifdef CONFIG_LPC17_USBHOST_REGDEBUG static void lpc17_printreg(uint32_t addr, uint32_t val, bool iswrite) { lldbg("%08x%s%08x\n", addr, iswrite ? "<-" : "->", val); } #endif /******************************************************************************* * Name: lpc17_checkreg * * Description: * Get the contents of an LPC17xx register * *******************************************************************************/ #ifdef CONFIG_LPC17_USBHOST_REGDEBUG static void lpc17_checkreg(uint32_t addr, uint32_t val, bool iswrite) { static uint32_t prevaddr = 0; static uint32_t preval = 0; static uint32_t count = 0; static bool prevwrite = false; /* Is this the same value that we read from/wrote to the same register last time? * Are we polling the register? If so, suppress the output. */ if (addr == prevaddr && val == preval && prevwrite == iswrite) { /* Yes.. Just increment the count */ count++; } else { /* No this is a new address or value or operation. Were there any * duplicate accesses before this one? */ if (count > 0) { /* Yes.. Just one? */ if (count == 1) { /* Yes.. Just one */ lpc17_printreg(prevaddr, preval, prevwrite); } else { /* No.. More than one. */ lldbg("[repeats %d more times]\n", count); } } /* Save the new address, value, count, and operation for next time */ prevaddr = addr; preval = val; count = 0; prevwrite = iswrite; /* Show the new regisgter access */ lpc17_printreg(addr, val, iswrite); } } #endif /******************************************************************************* * Name: lpc17_getreg * * Description: * Get the contents of an LPC17xx register * *******************************************************************************/ #ifdef CONFIG_LPC17_USBHOST_REGDEBUG static uint32_t lpc17_getreg(uint32_t addr) { /* Read the value from the register */ uint32_t val = getreg32(addr); /* Check if we need to print this value */ lpc17_checkreg(addr, val, false); return val; } #endif /******************************************************************************* * Name: lpc17_putreg * * Description: * Set the contents of an LPC17xx register to a value * *******************************************************************************/ #ifdef CONFIG_LPC17_USBHOST_REGDEBUG static void lpc17_putreg(uint32_t val, uint32_t addr) { /* Check if we need to print this value */ lpc17_checkreg(addr, val, true); /* Write the value */ putreg32(val, addr); } #endif /**************************************************************************** * Name: lpc17_takesem * * Description: * This is just a wrapper to handle the annoying behavior of semaphore * waits that return due to the receipt of a signal. * *******************************************************************************/ static void lpc17_takesem(sem_t *sem) { /* Take the semaphore (perhaps waiting) */ while (sem_wait(sem) != 0) { /* The only case that an error should occr here is if the wait was * awakened by a signal. */ ASSERT(errno == EINTR); } } /**************************************************************************** * Name: lpc17_getle16 * * Description: * Get a (possibly unaligned) 16-bit little endian value. * *******************************************************************************/ static inline uint16_t lpc17_getle16(const uint8_t *val) { return (uint16_t)val[1] << 8 | (uint16_t)val[0]; } /**************************************************************************** * Name: lpc17_putle16 * * Description: * Put a (possibly unaligned) 16-bit little endian value. * *******************************************************************************/ static void lpc17_putle16(uint8_t *dest, uint16_t val) { dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */ dest[1] = val >> 8; } /******************************************************************************* * Name: lpc17_tdalloc * * Description: * Allocate an TD buffer from the free list * * Assumptions: * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static uint8_t *lpc17_tdalloc(struct lpc17_usbhost_s *priv) { uint8_t *ret = (uint8_t *)g_tdfree; if (ret) { g_tdfree = ((struct lpc17_buflist_s*)ret)->flink; } return ret; } /******************************************************************************* * Name: lpc17_tdfree * * Description: * Return an TD buffer to the free list * *******************************************************************************/ static void lpc17_tdfree(struct lpc17_usbhost_s *priv, uint8_t *buffer) { struct lpc17_buflist_s *tdfree = (struct lpc17_buflist_s *)buffer; if (tdfree) { tdfree->flink = g_tdfree; g_tdfree = tdfree; } } /******************************************************************************* * Name: lpc17_ioalloc * * Description: * Allocate an IO buffer from the free list * * Assumptions: * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ #if LPC17_IOBUFFERS > 0 static uint8_t *lpc17_ioalloc(struct lpc17_usbhost_s *priv) { uint8_t *ret = (uint8_t *)g_iofree; if (ret) { g_iofree = ((struct lpc17_buflist_s*)ret)->flink; } return ret; } #endif /******************************************************************************* * Name: lpc17_iofree * * Description: * Return an TD buffer to the free list * *******************************************************************************/ #if LPC17_IOBUFFERS > 0 static void lpc17_iofree(struct lpc17_usbhost_s *priv, uint8_t *buffer) { struct lpc17_buflist_s *iofree = (struct lpc17_buflist_s *)buffer; iofree->flink = g_iofree; g_iofree = iofree; } #endif /******************************************************************************* * Name: lpc17_enqueuetd * * Description: * Enqueue a transfer descriptor * *******************************************************************************/ static void lpc17_enqueuetd(volatile struct ohci_ed_s *ed, uint32_t dirpid, uint32_t toggle, volatile uint8_t *buffer, size_t buflen) { TDHEAD->ctrl = (GTD_STATUS_R | dirpid | TD_DELAY(0) | toggle | GTD_STATUS_CC_MASK); TDTAIL->ctrl = 0; TDHEAD->cbp = (uint32_t)buffer; TDTAIL->cbp = 0; TDHEAD->nexttd = (uint32_t)TDTAIL; TDTAIL->nexttd = 0; TDHEAD->be = (uint32_t)(buffer + (buflen - 1)); TDTAIL->be = 0; ed->headp = (uint32_t)TDHEAD | ((ed->headp) & ED_HEADP_C); ed->tailp = (uint32_t)TDTAIL; ed->nexted = 0; } /******************************************************************************* * Name: lpc17_wdhwait * * Description: * Set the request for the Writeback Done Head event well BEFORE enabling the * transfer (as soon as we are absolutely committed to the to avoid transfer). * We do this to minimize race conditions. This logic would have to be expanded * if we want to have more than one packet in flight at a time! * *******************************************************************************/ static int lpc17_wdhwait(struct lpc17_usbhost_s *priv) { irqstate_t flags = irqsave(); int ret = -ENODEV; /* Is the device still connected? */ if (priv->connected) { /* Yes.. then set wdhwait to indicate that we expect to be informed when * either (1) the device is disconnected, or (2) the transfer completed. */ priv->wdhwait = true; ret = OK; } irqrestore(flags); return ret; } /******************************************************************************* * Name: lpc17_ctrltd * * Description: * Process a IN or OUT request on the control endpoint. This function * will enqueue the request and wait for it to complete. Only one transfer * may be queued; Neither these methods nor the transfer() method can be * called again until the control transfer functions returns. * * These are blocking methods; these functions will not return until the * control transfer has completed. * *******************************************************************************/ static int lpc17_ctrltd(struct lpc17_usbhost_s *priv, uint32_t dirpid, uint8_t *buffer, size_t buflen) { uint32_t toggle; uint32_t regval; int ret; /* Set the request for the Writeback Done Head event well BEFORE enabling the * transfer. */ ret = lpc17_wdhwait(priv); if (ret != OK) { udbg("ERROR: Device disconnected\n"); return ret; } /* Configure the toggle field in the TD */ if (dirpid == GTD_STATUS_DP_SETUP) { toggle = GTD_STATUS_T_DATA0; } else { toggle = GTD_STATUS_T_DATA1; } /* Then enqueue the transfer */ priv->tdstatus = TD_CC_NOERROR; lpc17_enqueuetd(EDCTRL, dirpid, toggle, buffer, buflen); /* Set the head of the control list to the EP0 EDCTRL (this would have to * change if we want more than on control EP queued at a time). */ lpc17_putreg(LPC17_EDCTRL_ADDR, LPC17_USBHOST_CTRLHEADED); /* Set ControlListFilled. This bit is used to indicate whether there are * TDs on the Control list. */ regval = lpc17_getreg(LPC17_USBHOST_CMDST); regval |= OHCI_CMDST_CLF; lpc17_putreg(regval, LPC17_USBHOST_CMDST); /* ControlListEnable. This bit is set to enable the processing of the * Control list. Note: once enabled, it remains enabled and we may even * complete list processing before we get the bit set. We really * should never modify the control list while CLE is set. */ regval = lpc17_getreg(LPC17_USBHOST_CTRL); regval |= OHCI_CTRL_CLE; lpc17_putreg(regval, LPC17_USBHOST_CTRL); /* Wait for the Writeback Done Head interrupt */ lpc17_takesem(&priv->wdhsem); /* Check the TDHEAD completion status bits */ if (priv->tdstatus == TD_CC_NOERROR) { return OK; } else { uvdbg("Bad TD completion status: %d\n", priv->tdstatus); return -EIO; } } /******************************************************************************* * Name: lpc17_usbinterrupt * * Description: * USB interrupt handler * *******************************************************************************/ static int lpc17_usbinterrupt(int irq, FAR void *context) { struct lpc17_usbhost_s *priv = &g_usbhost; uint32_t intst; uint32_t pending; uint32_t regval; /* Read Interrupt Status and mask out interrupts that are not enabled. */ intst = lpc17_getreg(LPC17_USBHOST_INTST); regval = lpc17_getreg(LPC17_USBHOST_INTEN); ullvdbg("INST: %08x INTEN: %08x\n", intst, regval); pending = intst & regval; if (pending != 0) { /* Root hub status change interrupt */ if ((pending & OHCI_INT_RHSC) != 0) { uint32_t rhportst1 = lpc17_getreg(LPC17_USBHOST_RHPORTST1); ullvdbg("Root Hub Status Change, RHPORTST1: %08x\n", rhportst1); if ((rhportst1 & OHCI_RHPORTST_CSC) != 0) { uint32_t rhstatus = lpc17_getreg(LPC17_USBHOST_RHSTATUS); ullvdbg("Connect Status Change, RHSTATUS: %08x\n", rhstatus); /* If DRWE is set, Connect Status Change indicates a remote wake-up event */ if (rhstatus & OHCI_RHSTATUS_DRWE) { ullvdbg("DRWE: Remote wake-up\n"); } /* Otherwise... Not a remote wake-up event */ else { /* Check if we are now connected */ if ((rhportst1 & OHCI_RHPORTST_CCS) != 0) { if (!priv->connected) { /* Yes.. connected. */ ullvdbg("Connected\n"); priv->tdstatus = TD_CC_NOERROR; priv->connected = true; /* Notify any waiters */ if (priv->rhswait) { lpc17_givesem(&priv->rhssem); priv->rhswait = false; } } else { ulldbg("Spurious status change (connected)\n"); } } /* Check if we are now disconnected */ else if (priv->connected) { /* Yes.. disconnect the device */ ullvdbg("Disconnected\n"); priv->connected = false; /* Are we bound to a class instance? */ if (priv->class) { /* Yes.. Disconnect the class */ CLASS_DISCONNECTED(priv->class); priv->class = NULL; } /* Notify any waiters for the Root Hub Status change event */ if (priv->rhswait) { lpc17_givesem(&priv->rhssem); priv->rhswait = false; } /* Wake up the thread waiting for the WDH event. In my * experience, the WHD event will occur later after the * disconnection, but it is safer to make sure that * there are no waiters. */ if (priv->wdhwait) { priv->tdstatus = TD_CC_DEVNOTRESPONDING; lpc17_givesem(&priv->wdhsem); priv->wdhwait = false; } } else { ulldbg("Spurious status change (disconnected)\n"); } } /* Clear the status change interrupt */ lpc17_putreg(OHCI_RHPORTST_CSC, LPC17_USBHOST_RHPORTST1); } /* Check for port reset status change */ if ((rhportst1 & OHCI_RHPORTST_PRSC) != 0) { /* Release the RH port from reset */ lpc17_putreg(OHCI_RHPORTST_PRSC, LPC17_USBHOST_RHPORTST1); } } /* Writeback Done Head interrupt */ if ((pending & OHCI_INT_WDH) != 0) { /* The host controller just wrote the list of finished TDs into the HCCA * done head. Here we assume that only a single packet is "in flight" * at any given time and we use only the TD at TDHEAD. So not much needs * to be done here. In a more complex implementation we would need to * recover these completed TDs in some meaningful way. */ /* Since there is only one TD, we can disable further TD processing. */ regval = lpc17_getreg(LPC17_USBHOST_CTRL); regval &= ~(OHCI_CTRL_PLE|OHCI_CTRL_IE|OHCI_CTRL_CLE|OHCI_CTRL_BLE); lpc17_putreg(regval, LPC17_USBHOST_CTRL); /* Get the condition code from the (single) TDHEAD TD status/control word */ priv->tdstatus = (TDHEAD->ctrl & GTD_STATUS_CC_MASK) >> GTD_STATUS_CC_SHIFT; #ifdef CONFIG_DEBUG_USB if (priv->tdstatus != TD_CC_NOERROR) { /* The transfer failed for some reason... dump some diagnostic info. */ ulldbg("ERROR: TD CTRL:%08x/CC:%d RHPORTST1:%08x\n", TDHEAD->ctrl, priv->tdstatus, lpc17_getreg(LPC17_USBHOST_RHPORTST1)); } #endif /* And wake up the thread waiting for the WDH event */ if (priv->wdhwait) { lpc17_givesem(&priv->wdhsem); priv->wdhwait = false; } } #ifdef CONFIG_DEBUG_USB if ((pending & LPC17_DEBUG_INTS) != 0) { ulldbg("ERROR: Unhandled interrupts INTST:%08x\n", intst); } #endif /* Clear interrupt status register */ lpc17_putreg(intst, LPC17_USBHOST_INTST); } return OK; } /******************************************************************************* * USB Host Controller Operations *******************************************************************************/ /******************************************************************************* * Name: lpc17_wait * * Description: * Wait for a device to be connected or disconneced. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * connected - TRUE: Wait for device to be connected; FALSE: wait for device * to be disconnected * * Returned Values: * Zero (OK) is returned when a device in connected. This function will not * return until either (1) a device is connected or (2) some failure occurs. * On a failure, a negated errno value is returned indicating the nature of * the failure * * Assumptions: * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_wait(FAR struct usbhost_driver_s *drvr, bool connected) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; irqstate_t flags; /* Are we already connected? */ flags = irqsave(); while (priv->connected == connected) { /* No... wait for the connection/disconnection */ priv->rhswait = true; lpc17_takesem(&priv->rhssem); } irqrestore(flags); udbg("Connected:%s\n", priv->connected ? "YES" : "NO"); return OK; } /******************************************************************************* * Name: lpc17_enumerate * * Description: * Enumerate the connected device. As part of this enumeration process, * the driver will (1) get the device's configuration descriptor, (2) * extract the class ID info from the configuration descriptor, (3) call * usbhost_findclass() to find the class that supports this device, (4) * call the create() method on the struct usbhost_registry_s interface * to get a class instance, and finally (5) call the configdesc() method * of the struct usbhost_class_s interface. After that, the class is in * charge of the sequence of operations. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * - Only a single class bound to a single device is supported. * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_enumerate(FAR struct usbhost_driver_s *drvr) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; /* Are we connected to a device? The caller should have called the wait() * method first to be assured that a device is connected. */ while (!priv->connected) { /* No, return an error */ udbg("Not connected\n"); return -ENODEV; } /* USB 2.0 spec says at least 50ms delay before port reset */ up_mdelay(100); /* Put RH port 1 in reset (the LPC176x supports only a single downstream port) */ lpc17_putreg(OHCI_RHPORTST_PRS, LPC17_USBHOST_RHPORTST1); /* Wait for the port reset to complete */ while ((lpc17_getreg(LPC17_USBHOST_RHPORTST1) & OHCI_RHPORTST_PRS) != 0); /* Release RH port 1 from reset and wait a bit */ lpc17_putreg(OHCI_RHPORTST_PRSC, LPC17_USBHOST_RHPORTST1); up_mdelay(200); /* Let the common usbhost_enumerate do all of the real work. Note that the * FunctionAddress (USB address) is hardcoded to one. */ uvdbg("Enumerate the device\n"); return usbhost_enumerate(drvr, 1, &priv->class); } /************************************************************************************ * Name: lpc17_ep0configure * * Description: * Configure endpoint 0. This method is normally used internally by the * enumerate() method but is made available at the interface to support * an external implementation of the enumeration logic. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * funcaddr - The USB address of the function containing the endpoint that EP0 * controls * maxpacketsize - The maximum number of bytes that can be sent to or * received from the endpoint in a single data packet * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * This function will *not* be called from an interrupt handler. * ************************************************************************************/ static int lpc17_ep0configure(FAR struct usbhost_driver_s *drvr, uint8_t funcaddr, uint16_t maxpacketsize) { DEBUGASSERT(drvr && funcaddr < 128 && maxpacketsize < 2048); EDCTRL->ctrl = (uint32_t)funcaddr << ED_CONTROL_FA_SHIFT | (uint32_t)maxpacketsize << ED_CONTROL_MPS_SHIFT; return OK; } /************************************************************************************ * Name: lpc17_epalloc * * Description: * Allocate and configure one endpoint. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * epdesc - Describes the endpoint to be allocated. * ep - A memory location provided by the caller in which to receive the * allocated endpoint desciptor. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * This function will *not* be called from an interrupt handler. * ************************************************************************************/ static int lpc17_epalloc(FAR struct usbhost_driver_s *drvr, const FAR struct usbhost_epdesc_s *epdesc, usbhost_ep_t *ep) { struct ohci_ed_s *ed; int ret = -ENOMEM; DEBUGASSERT(epdesc && ep); /* Take the next ED from the beginning of the free list */ ed = (struct ohci_ed_s *)g_edfree; if (ed) { /* Remove the ED from the freelist */ g_edfree = ((struct lpc17_edlist_s*)ed)->flink; /* Configure the endpoint descriptor. */ lpc17_edinit(ed); ed->ctrl = (uint32_t)(epdesc->funcaddr) << ED_CONTROL_FA_SHIFT | (uint32_t)(epdesc->addr) << ED_CONTROL_EN_SHIFT | (uint32_t)(epdesc->mxpacketsize) << ED_CONTROL_MPS_SHIFT; /* Get the direction of the endpoint */ if (epdesc->in != 0) { ed->ctrl |= ED_CONTROL_D_IN; } else { ed->ctrl |= ED_CONTROL_D_OUT; } /* Return an opaque reference to the ED */ *ep = (usbhost_ep_t)ed; ret = OK; } return ret; } /************************************************************************************ * Name: lpc17_epfree * * Description: * Free and endpoint previously allocated by DRVR_EPALLOC. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * ep - The endpint to be freed. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * This function will *not* be called from an interrupt handler. * ************************************************************************************/ static int lpc17_epfree(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep) { struct lpc17_edlist_s *ed = (struct lpc17_edlist_s *)ep; DEBUGASSERT(ed); /* Put the ED back into the free list */ ed->flink = g_edfree; g_edfree = ed; return OK; } /******************************************************************************* * Name: lpc17_alloc * * Description: * Some hardware supports special memory in which transfer descriptors can * be accessed more efficiently. This method provides a mechanism to allocate * the transfer descriptor memory. If the underlying hardware does not support * such "special" memory, this functions may simply map to malloc. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * buffer - The address of a memory location provided by the caller in which to * return the allocated buffer memory address. * maxlen - The address of a memory location provided by the caller in which to * return the maximum size of the allocated buffer memory. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_alloc(FAR struct usbhost_driver_s *drvr, FAR uint8_t **buffer, FAR size_t *maxlen) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; DEBUGASSERT(priv && buffer && maxlen); *buffer = lpc17_tdalloc(priv); if (*buffer) { *maxlen = CONFIG_USBHOST_TDBUFSIZE; return OK; } return -ENOMEM; } /******************************************************************************* * Name: lpc17_free * * Description: * Some hardware supports special memory in which transfer descriptors can * be accessed more efficiently. This method provides a mechanism to free that * transfer descriptor memory. If the underlying hardware does not support * such "special" memory, this functions may simply map to free(). * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * buffer - The address of the allocated buffer memory to be freed. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_free(FAR struct usbhost_driver_s *drvr, FAR uint8_t *buffer) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; DEBUGASSERT(priv && buffer); lpc17_tdfree(priv, buffer); return OK; } /******************************************************************************* * Name: lpc17_ctrlin and lpc17_ctrlout * * Description: * Process a IN or OUT request on the control endpoint. These methods * will enqueue the request and wait for it to complete. Only one transfer may be * queued; Neither these methods nor the transfer() method can be called again * until the control transfer functions returns. * * These are blocking methods; these functions will not return until the * control transfer has completed. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * req - Describes the request to be sent. This request must lie in memory * created by DRVR_ALLOC. * buffer - A buffer used for sending the request and for returning any * responses. This buffer must be large enough to hold the length value * in the request description. buffer must have been allocated using DRVR_ALLOC * * NOTE: On an IN transaction, req and buffer may refer to the same allocated * memory. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * - Only a single class bound to a single device is supported. * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_ctrlin(FAR struct usbhost_driver_s *drvr, FAR const struct usb_ctrlreq_s *req, FAR uint8_t *buffer) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; uint16_t len; int ret; DEBUGASSERT(drvr && req); uvdbg("type:%02x req:%02x value:%02x%02x index:%02x%02x len:%02x%02x\n", req->type, req->req, req->value[1], req->value[0], req->index[1], req->index[0], req->len[1], req->len[0]); len = lpc17_getle16(req->len); ret = lpc17_ctrltd(priv, GTD_STATUS_DP_SETUP, (uint8_t*)req, USB_SIZEOF_CTRLREQ); if (ret == OK) { if (len) { ret = lpc17_ctrltd(priv, GTD_STATUS_DP_IN, buffer, len); } if (ret == OK) { ret = lpc17_ctrltd(priv, GTD_STATUS_DP_OUT, NULL, 0); } } return ret; } static int lpc17_ctrlout(FAR struct usbhost_driver_s *drvr, FAR const struct usb_ctrlreq_s *req, FAR const uint8_t *buffer) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; uint16_t len; int ret; DEBUGASSERT(drvr && req); uvdbg("type:%02x req:%02x value:%02x%02x index:%02x%02x len:%02x%02x\n", req->type, req->req, req->value[1], req->value[0], req->index[1], req->index[0], req->len[1], req->len[0]); len = lpc17_getle16(req->len); ret = lpc17_ctrltd(priv, GTD_STATUS_DP_SETUP, (uint8_t*)req, USB_SIZEOF_CTRLREQ); if (ret == OK) { if (len) { ret = lpc17_ctrltd(priv, GTD_STATUS_DP_OUT, (uint8_t*)buffer, len); } if (ret == OK) { ret = lpc17_ctrltd(priv, GTD_STATUS_DP_IN, NULL, 0); } } return ret; } /******************************************************************************* * Name: lpc17_transfer * * Description: * Process a request to handle a transfer descriptor. This method will * enqueue the transfer request and return immediately. Only one transfer may be * queued; Neither this method nor the ctrlin or ctrlout methods can be called * again until this function returns. * * This is a blocking method; this functions will not return until the * transfer has completed. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * ep - The IN or OUT endpoint descriptor for the device endpoint on which to * perform the transfer. * buffer - A buffer containing the data to be sent (OUT endpoint) or received * (IN endpoint). buffer must have been allocated using DRVR_ALLOC * buflen - The length of the data to be sent or received. * * Returned Values: * On success, zero (OK) is returned. On a failure, a negated errno value is * returned indicating the nature of the failure * * Assumptions: * - Only a single class bound to a single device is supported. * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static int lpc17_transfer(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep, FAR uint8_t *buffer, size_t buflen) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; struct ohci_ed_s *ed = (struct ohci_ed_s *)ep; uint32_t dirpid; uint32_t regval; #if LPC17_IOBUFFERS > 0 uint8_t *origbuf = NULL; #endif bool in; int ret; DEBUGASSERT(priv && ed && buffer && buflen > 0); in = (ed->ctrl & ED_CONTROL_D_MASK) == ED_CONTROL_D_IN; uvdbg("EP%d %s toggle:%d maxpacket:%d buflen:%d\n", (ed->ctrl & ED_CONTROL_EN_MASK) >> ED_CONTROL_EN_SHIFT, in ? "IN" : "OUT", (ed->headp & ED_HEADP_C) != 0 ? 1 : 0, (ed->ctrl & ED_CONTROL_MPS_MASK) >> ED_CONTROL_MPS_SHIFT, buflen); /* Allocate an IO buffer if the user buffer does not lie in AHB SRAM */ #if LPC17_IOBUFFERS > 0 if ((uintptr_t)buffer < LPC17_SRAM_BANK0 || (uintptr_t)buffer >= (LPC17_SRAM_BANK0 + LPC17_BANK0_SIZE + LPC17_BANK1_SIZE)) { /* Will the transfer fit in an IO buffer? */ if (buflen > CONFIG_USBHOST_IOBUFSIZE) { uvdbg("buflen (%d) > IO buffer size (%d)\n", buflen, CONFIG_USBHOST_IOBUFSIZE); ret = -ENOMEM; goto errout; } /* Allocate an IO buffer in AHB SRAM */ origbuf = buffer; buffer = lpc17_ioalloc(priv); if (!buffer) { uvdbg("IO buffer allocation failed\n"); ret = -ENOMEM; goto errout; } /* If this is an OUT transaction, copy the user data into the AHB * SRAM IO buffer. Sad... so inefficient. But without exposing * the AHB SRAM to the final, end-user client I don't know of any * way around this copy. */ if (!in) { memcpy(buffer, origbuf, buflen); } } #endif /* Set the request for the Writeback Done Head event well BEFORE enabling the * transfer. */ ret = lpc17_wdhwait(priv); if (ret != OK) { udbg("ERROR: Device disconnected\n"); goto errout; } /* Get the direction of the endpoint */ if (in) { dirpid = GTD_STATUS_DP_IN; } else { dirpid = GTD_STATUS_DP_OUT; } /* Then enqueue the transfer */ priv->tdstatus = TD_CC_NOERROR; lpc17_enqueuetd(ed, dirpid, GTD_STATUS_T_TOGGLE, buffer, buflen); /* Set the head of the bulk list to the EP descriptor (this would have to * change if we want more than on bulk EP queued at a time). */ lpc17_putreg((uint32_t)ed, LPC17_USBHOST_BULKHEADED); /* BulkListFilled. This bit is used to indicate whether there are any * TDs on the Bulk list. */ regval = lpc17_getreg(LPC17_USBHOST_CMDST); regval |= OHCI_CMDST_BLF; lpc17_putreg(regval, LPC17_USBHOST_CMDST); /* BulkListEnable. This bit is set to enable the processing of the Bulk * list. Note: once enabled, it remains enabled and we may even * complete list processing before we get the bit set. We really * should never modify the bulk list while BLE is set. */ regval = lpc17_getreg(LPC17_USBHOST_CTRL); regval |= OHCI_CTRL_BLE; lpc17_putreg(regval, LPC17_USBHOST_CTRL); /* Wait for the Writeback Done Head interrupt */ lpc17_takesem(&priv->wdhsem); /* Check the TDHEAD completion status bits */ if (priv->tdstatus == TD_CC_NOERROR) { ret = OK; } else { uvdbg("Bad TD completion status: %d\n", priv->tdstatus); ret = -EIO; } errout: /* Free any temporary IO buffers */ #if LPC17_IOBUFFERS > 0 if (buffer && origbuf) { /* If this is an IN transaction, get the user data from the AHB * SRAM IO buffer. Sad... so inefficient. But without exposing * the AHB SRAM to the final, end-user client I don't know of any * way around this copy. */ if (in && ret == OK) { memcpy(origbuf, buffer, buflen); } /* Then free the temporary I/O buffer */ lpc17_iofree(priv, buffer); } #endif return ret; } /******************************************************************************* * Name: lpc17_disconnect * * Description: * Called by the class when an error occurs and driver has been disconnected. * The USB host driver should discard the handle to the class instance (it is * stale) and not attempt any further interaction with the class driver instance * (until a new instance is received from the create() method). The driver * should not called the class' disconnected() method. * * Input Parameters: * drvr - The USB host driver instance obtained as a parameter from the call to * the class create() method. * * Returned Values: * None * * Assumptions: * - Only a single class bound to a single device is supported. * - Called from a single thread so no mutual exclusion is required. * - Never called from an interrupt handler. * *******************************************************************************/ static void lpc17_disconnect(FAR struct usbhost_driver_s *drvr) { struct lpc17_usbhost_s *priv = (struct lpc17_usbhost_s *)drvr; priv->class = NULL; } /******************************************************************************* * Initialization *******************************************************************************/ static void lpc17_tdinit(volatile struct ohci_gtd_s *td) { td->ctrl = 0; td->cbp = 0; td->nexttd = 0; td->be = 0; } static void lpc17_edinit(volatile struct ohci_ed_s *ed) { ed->ctrl = 0; ed->tailp = 0; ed->headp = 0; ed->nexted = 0; } static void lpc17_hccainit(volatile struct ohci_hcca_s *hcca) { int i; for (i = 0; i < 32; i++) { hcca->inttbl[i] = 0; } hcca->fmno = 0; hcca->donehead = 0; } /******************************************************************************* * Public Functions *******************************************************************************/ /******************************************************************************* * Name: usbhost_initialize * * Description: * Initialize USB host device controller hardware. * * Input Parameters: * controller -- If the device supports more than USB host controller, then * this identifies which controller is being intialized. Normally, this * is just zero. * * Returned Value: * And instance of the USB host interface. The controlling task should * use this interface to (1) call the wait() method to wait for a device * to be connected, and (2) call the enumerate() method to bind the device * to a class driver. * * Assumptions: * - This function should called in the initialization sequence in order * to initialize the USB device functionality. * - Class drivers should be initialized prior to calling this function. * Otherwise, there is a race condition if the device is already connected. * *******************************************************************************/ FAR struct usbhost_driver_s *usbhost_initialize(int controller) { struct lpc17_usbhost_s *priv = &g_usbhost; uint32_t regval; uint8_t *buffer; irqstate_t flags; int i; DEBUGASSERT(controller == 0); /* Initialize the state data structure */ sem_init(&priv->rhssem, 0, 0); sem_init(&priv->wdhsem, 0, 0); /* Enable power by setting PCUSB in the PCONP register. Disable interrupts * because this register may be shared with other drivers. */ flags = irqsave(); regval = lpc17_getreg(LPC17_SYSCON_PCONP); regval |= SYSCON_PCONP_PCUSB; lpc17_putreg(regval, LPC17_SYSCON_PCONP); irqrestore(flags); /* Enable clocking on USB (USB PLL clocking was initialized in very low- * evel clock setup logic (see lpc17_clockconfig.c)). We do still need * to set up USBOTG CLKCTRL to enable clocking. * * NOTE: The PORTSEL clock needs to be enabled only when accessing OTGSTCTRL */ lpc17_putreg(LPC17_CLKCTRL_ENABLES, LPC17_USBOTG_CLKCTRL); /* Then wait for the clocks to be reported as "ON" */ do { regval = lpc17_getreg(LPC17_USBOTG_CLKST); } while ((regval & LPC17_CLKCTRL_ENABLES) != LPC17_CLKCTRL_ENABLES); /* Set the OTG status and control register. Bits 0:1 apparently mean: * * 00: U1=device, U2=host * 01: U1=host, U2=host * 10: reserved * 11: U1=host, U2=device * * We need only select U1=host (Bit 0=1, Bit 1 is not used on LPC176x); * NOTE: The PORTSEL clock needs to be enabled when accessing OTGSTCTRL */ lpc17_putreg(1, LPC17_USBOTG_STCTRL); /* Now we can turn off the PORTSEL clock */ lpc17_putreg((LPC17_CLKCTRL_ENABLES & ~USBOTG_CLK_PORTSELCLK), LPC17_USBOTG_CLKCTRL); /* Configure I/O pins */ usbhost_dumpgpio(); lpc17_configgpio(GPIO_USB_DP); /* Positive differential data */ lpc17_configgpio(GPIO_USB_DM); /* Negative differential data */ lpc17_configgpio(GPIO_USB_UPLED); /* GoodLink LED control signal */ lpc17_configgpio(GPIO_USB_PPWR); /* Port Power enable signal for USB port */ lpc17_configgpio(GPIO_USB_PWRD); /* Power Status for USB port (host power switch) */ lpc17_configgpio(GPIO_USB_OVRCR); /* USB port Over-Current status */ usbhost_dumpgpio(); udbg("Initializing Host Stack\n"); /* Initialize all the TDs, EDs and HCCA to 0 */ lpc17_hccainit(HCCA); lpc17_tdinit(TDHEAD); lpc17_tdinit(TDTAIL); lpc17_edinit(EDCTRL); /* Initialize user-configurable EDs */ for (i = 0; i < CONFIG_USBHOST_NEDS; i++) { /* Put the ED in a free list */ lpc17_epfree(&priv->drvr, (usbhost_ep_t)&EDFREE[i]); } /* Initialize user-configurable TD buffers */ buffer = TDFREE; for (i = 0; i < CONFIG_USBHOST_NEDS; i++) { /* Put the TD buffer in a free list */ lpc17_tdfree(priv, buffer); buffer += CONFIG_USBHOST_TDBUFSIZE; } #if LPC17_IOBUFFERS > 0 /* Initialize user-configurable IO buffers */ buffer = IOFREE; for (i = 0; i < LPC17_IOBUFFERS; i++) { /* Put the IO buffer in a free list */ lpc17_iofree(priv, buffer); buffer += CONFIG_USBHOST_IOBUFSIZE; } #endif /* Wait 50MS then perform hardware reset */ up_mdelay(50); lpc17_putreg(0, LPC17_USBHOST_CTRL); /* Hardware reset */ lpc17_putreg(0, LPC17_USBHOST_CTRLHEADED); /* Initialize control list head to Zero */ lpc17_putreg(0, LPC17_USBHOST_BULKHEADED); /* Initialize bulk list head to Zero */ /* Software reset */ lpc17_putreg(OHCI_CMDST_HCR, LPC17_USBHOST_CMDST); /* Write Fm interval (FI), largest data packet counter (FSMPS), and * periodic start. */ lpc17_putreg(DEFAULT_FMINTERVAL, LPC17_USBHOST_FMINT); lpc17_putreg(DEFAULT_PERSTART, LPC17_USBHOST_PERSTART); /* Put HC in operational state */ regval = lpc17_getreg(LPC17_USBHOST_CTRL); regval &= ~OHCI_CTRL_HCFS_MASK; regval |= OHCI_CTRL_HCFS_OPER; lpc17_putreg(regval, LPC17_USBHOST_CTRL); /* Set global power in HcRhStatus */ lpc17_putreg(OHCI_RHSTATUS_SGP, LPC17_USBHOST_RHSTATUS); /* Set HCCA base address */ lpc17_putreg((uint32_t)HCCA, LPC17_USBHOST_HCCA); /* Clear pending interrupts */ regval = lpc17_getreg(LPC17_USBHOST_INTST); lpc17_putreg(regval, LPC17_USBHOST_INTST); /* Enable OHCI interrupts */ lpc17_putreg((LPC17_ALL_INTS|OHCI_INT_MIE), LPC17_USBHOST_INTEN); /* Attach USB host controller interrupt handler */ if (irq_attach(LPC17_IRQ_USB, lpc17_usbinterrupt) != 0) { udbg("Failed to attach IRQ\n"); return NULL; } /* Enable USB interrupts at the SYCON controller. Disable interrupts * because this register may be shared with other drivers. */ flags = irqsave(); regval = lpc17_getreg(LPC17_SYSCON_USBINTST); regval |= SYSCON_USBINTST_ENINTS; lpc17_putreg(regval, LPC17_SYSCON_USBINTST); irqrestore(flags); /* If there is a USB device in the slot at power up, then we will not * get the status change interrupt to signal us that the device is * connected. We need to set the initial connected state accordingly. */ regval = lpc17_getreg(LPC17_USBHOST_RHPORTST1); priv->connected = ((regval & OHCI_RHPORTST_CCS) != 0); /* Enable interrupts at the interrupt controller */ up_enable_irq(LPC17_IRQ_USB); /* enable USB interrupt */ udbg("USB host Initialized, Device connected:%s\n", priv->connected ? "YES" : "NO"); return &priv->drvr; }