USBHALHost.cpp

00001 /* mbed USBHost Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "mbed.h"
00018 #include "USBHALHost.h"
00019 #include "dbg.h"
00020 
00021 // bits of the USB/OTG clock control register
00022 #define HOST_CLK_EN     (1<<0)
00023 #define DEV_CLK_EN      (1<<1)
00024 #define PORTSEL_CLK_EN  (1<<3)
00025 #define AHB_CLK_EN      (1<<4)
00026 
00027 // bits of the USB/OTG clock status register
00028 #define HOST_CLK_ON     (1<<0)
00029 #define DEV_CLK_ON      (1<<1)
00030 #define PORTSEL_CLK_ON  (1<<3)
00031 #define AHB_CLK_ON      (1<<4)
00032 
00033 // we need host clock, OTG/portsel clock and AHB clock
00034 #define CLOCK_MASK (HOST_CLK_EN | PORTSEL_CLK_EN | AHB_CLK_EN)
00035 
00036 #define HCCA_SIZE sizeof(HCCA)
00037 #define ED_SIZE sizeof(HCED)
00038 #define TD_SIZE sizeof(HCTD)
00039 
00040 #define TOTAL_SIZE (HCCA_SIZE + (MAX_ENDPOINT*ED_SIZE) + (MAX_TD*TD_SIZE))
00041 
00042 static volatile uint8_t usb_buf[TOTAL_SIZE] __attribute((section("AHBSRAM1"),aligned(256)));  //256 bytes aligned!
00043 
00044 USBHALHost * USBHALHost::instHost;
00045 
00046 USBHALHost::USBHALHost() {
00047     instHost = this;
00048     memInit();
00049     memset((void*)usb_hcca, 0, HCCA_SIZE);
00050     for (int i = 0; i < MAX_ENDPOINT; i++) {
00051         edBufAlloc[i] = false;
00052     }
00053     for (int i = 0; i < MAX_TD; i++) {
00054         tdBufAlloc[i] = false;
00055     }
00056 }
00057 
00058 void USBHALHost::init() {
00059     NVIC_DisableIRQ(USB_IRQn);
00060     
00061     //Cut power
00062     LPC_SC->PCONP &= ~(1UL<<31);
00063     wait_ms(100);
00064 
00065     // turn on power for USB
00066     LPC_SC->PCONP       |= (1UL<<31);
00067 
00068     // Enable USB host clock, port selection and AHB clock
00069     LPC_USB->USBClkCtrl |= CLOCK_MASK;
00070 
00071     // Wait for clocks to become available
00072     while ((LPC_USB->USBClkSt & CLOCK_MASK) != CLOCK_MASK);
00073 
00074     // it seems the bits[0:1] mean the following
00075     // 0: U1=device, U2=host
00076     // 1: U1=host, U2=host
00077     // 2: reserved
00078     // 3: U1=host, U2=device
00079     // NB: this register is only available if OTG clock (aka "port select") is enabled!!
00080     // since we don't care about port 2, set just bit 0 to 1 (U1=host)
00081     LPC_USB->OTGStCtrl |= 1;
00082 
00083     // now that we've configured the ports, we can turn off the portsel clock
00084     LPC_USB->USBClkCtrl &= ~PORTSEL_CLK_EN;
00085 
00086     // configure USB D+/D- pins
00087     // P0[29] = USB_D+, 01
00088     // P0[30] = USB_D-, 01
00089     LPC_PINCON->PINSEL1 &= ~((3<<26) | (3<<28));
00090     LPC_PINCON->PINSEL1 |=  ((1<<26) | (1<<28));
00091 
00092     LPC_USB->HcControl       = 0; // HARDWARE RESET
00093     LPC_USB->HcControlHeadED = 0; // Initialize Control list head to Zero
00094     LPC_USB->HcBulkHeadED    = 0; // Initialize Bulk list head to Zero
00095 
00096     // Wait 100 ms before apply reset
00097     wait_ms(100);
00098 
00099     // software reset
00100     LPC_USB->HcCommandStatus = OR_CMD_STATUS_HCR;
00101     
00102     // Write Fm Interval and Largest Data Packet Counter
00103     LPC_USB->HcFmInterval    = DEFAULT_FMINTERVAL;
00104     LPC_USB->HcPeriodicStart = FI * 90 / 100;
00105 
00106     // Put HC in operational state
00107     LPC_USB->HcControl  = (LPC_USB->HcControl & (~OR_CONTROL_HCFS)) | OR_CONTROL_HC_OPER;
00108     // Set Global Power
00109     LPC_USB->HcRhStatus = OR_RH_STATUS_LPSC;
00110 
00111     LPC_USB->HcHCCA = (uint32_t)(usb_hcca);
00112     
00113     // Clear Interrrupt Status
00114     LPC_USB->HcInterruptStatus |= LPC_USB->HcInterruptStatus;
00115 
00116     LPC_USB->HcInterruptEnable  = OR_INTR_ENABLE_MIE | OR_INTR_ENABLE_WDH | OR_INTR_ENABLE_RHSC;
00117 
00118     // Enable the USB Interrupt
00119     NVIC_SetVector(USB_IRQn, (uint32_t)(_usbisr));
00120     LPC_USB->HcRhPortStatus1 = OR_RH_PORT_CSC;
00121     LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC;
00122 
00123     NVIC_EnableIRQ(USB_IRQn);
00124 
00125     // Check for any connected devices
00126     if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CCS) {
00127         //Device connected
00128         wait_ms(150);
00129         USB_DBG("Device connected (%08x)\n\r", LPC_USB->HcRhPortStatus1);
00130         deviceConnected(0, 1, LPC_USB->HcRhPortStatus1 & OR_RH_PORT_LSDA);
00131     }
00132 }
00133 
00134 uint32_t USBHALHost::controlHeadED() {
00135     return LPC_USB->HcControlHeadED;
00136 }
00137 
00138 uint32_t USBHALHost::bulkHeadED() {
00139     return LPC_USB->HcBulkHeadED;
00140 }
00141 
00142 uint32_t USBHALHost::interruptHeadED() {
00143     return usb_hcca->IntTable[0];
00144 }
00145 
00146 void USBHALHost::updateBulkHeadED(uint32_t addr) {
00147     LPC_USB->HcBulkHeadED = addr;
00148 }
00149 
00150 
00151 void USBHALHost::updateControlHeadED(uint32_t addr) {
00152     LPC_USB->HcControlHeadED = addr;
00153 }
00154 
00155 void USBHALHost::updateInterruptHeadED(uint32_t addr) {
00156     usb_hcca->IntTable[0] = addr;
00157 }
00158 
00159 
00160 void USBHALHost::enableList(ENDPOINT_TYPE type) {
00161     switch(type) {
00162         case CONTROL_ENDPOINT:
00163             LPC_USB->HcCommandStatus = OR_CMD_STATUS_CLF;
00164             LPC_USB->HcControl |= OR_CONTROL_CLE;
00165             break;
00166         case ISOCHRONOUS_ENDPOINT:
00167             break;
00168         case BULK_ENDPOINT:
00169             LPC_USB->HcCommandStatus = OR_CMD_STATUS_BLF;
00170             LPC_USB->HcControl |= OR_CONTROL_BLE;
00171             break;
00172         case INTERRUPT_ENDPOINT:
00173             LPC_USB->HcControl |= OR_CONTROL_PLE;
00174             break;
00175     }
00176 }
00177 
00178 
00179 bool USBHALHost::disableList(ENDPOINT_TYPE type) {
00180     switch(type) {
00181         case CONTROL_ENDPOINT:
00182             if(LPC_USB->HcControl & OR_CONTROL_CLE) {
00183                 LPC_USB->HcControl &= ~OR_CONTROL_CLE;
00184                 return true;
00185             }
00186             return false;
00187         case ISOCHRONOUS_ENDPOINT:
00188             return false;
00189         case BULK_ENDPOINT:
00190             if(LPC_USB->HcControl & OR_CONTROL_BLE){
00191                 LPC_USB->HcControl &= ~OR_CONTROL_BLE;
00192                 return true;
00193             }
00194             return false;
00195         case INTERRUPT_ENDPOINT:
00196             if(LPC_USB->HcControl & OR_CONTROL_PLE) {
00197                 LPC_USB->HcControl &= ~OR_CONTROL_PLE;
00198                 return true;
00199             }
00200             return false;
00201     }
00202     return false;
00203 }
00204 
00205 
00206 void USBHALHost::memInit() {
00207     usb_hcca = (volatile HCCA *)usb_buf;
00208     usb_edBuf = usb_buf + HCCA_SIZE;
00209     usb_tdBuf = usb_buf + HCCA_SIZE + (MAX_ENDPOINT*ED_SIZE);
00210 }
00211 
00212 volatile uint8_t * USBHALHost::getED() {
00213     for (int i = 0; i < MAX_ENDPOINT; i++) {
00214         if ( !edBufAlloc[i] ) {
00215             edBufAlloc[i] = true;
00216             return (volatile uint8_t *)(usb_edBuf + i*ED_SIZE);
00217         }
00218     }
00219     perror("Could not allocate ED\r\n");
00220     return NULL; //Could not alloc ED
00221 }
00222 
00223 volatile uint8_t * USBHALHost::getTD() {
00224     int i;
00225     for (i = 0; i < MAX_TD; i++) {
00226         if ( !tdBufAlloc[i] ) {
00227             tdBufAlloc[i] = true;
00228             return (volatile uint8_t *)(usb_tdBuf + i*TD_SIZE);
00229         }
00230     }
00231     perror("Could not allocate TD\r\n");
00232     return NULL; //Could not alloc TD
00233 }
00234 
00235 
00236 void USBHALHost::freeED(volatile uint8_t * ed) {
00237     int i;
00238     i = (ed - usb_edBuf) / ED_SIZE;
00239     edBufAlloc[i] = false;
00240 }
00241 
00242 void USBHALHost::freeTD(volatile uint8_t * td) {
00243     int i;
00244     i = (td - usb_tdBuf) / TD_SIZE;
00245     tdBufAlloc[i] = false;
00246 }
00247 
00248 
00249 void USBHALHost::resetRootHub() {
00250     // Initiate port reset
00251     LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRS;
00252     
00253     while (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRS);
00254     
00255     // ...and clear port reset signal
00256     LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC;
00257 }
00258 
00259 
00260 void USBHALHost::_usbisr(void) {
00261     if (instHost) {
00262         instHost->UsbIrqhandler();
00263     }
00264 }
00265 
00266 void USBHALHost::UsbIrqhandler() {
00267     if( LPC_USB->HcInterruptStatus & LPC_USB->HcInterruptEnable ) //Is there something to actually process?
00268     {
00269         
00270         uint32_t int_status = LPC_USB->HcInterruptStatus & LPC_USB->HcInterruptEnable;
00271 
00272         // Root hub status change interrupt
00273         if (int_status & OR_INTR_STATUS_RHSC) { 
00274             if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CSC) {
00275                 if (LPC_USB->HcRhStatus & OR_RH_STATUS_DRWE) {
00276                     // When DRWE is on, Connect Status Change
00277                     // means a remote wakeup event.
00278                 } else {
00279 
00280                     //Root device connected
00281                     if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CCS) { 
00282                         
00283                         // wait 150ms to avoid bounce
00284                         wait_ms(150);
00285                         
00286                         //Hub 0 (root hub), Port 1 (count starts at 1), Low or High speed
00287                         deviceConnected(0, 1, LPC_USB->HcRhPortStatus1 & OR_RH_PORT_LSDA); 
00288                     } 
00289                     
00290                     //Root device disconnected
00291                     else { 
00292                         
00293                         if (!(int_status & OR_INTR_STATUS_WDH)) {
00294                             usb_hcca->DoneHead = 0;
00295                         }
00296                         
00297                         // wait 200ms to avoid bounce
00298                         wait_ms(200);
00299                         
00300                         deviceDisconnected(0, 1, NULL, usb_hcca->DoneHead & 0xFFFFFFFE);
00301                         
00302                         if (int_status & OR_INTR_STATUS_WDH) {
00303                             usb_hcca->DoneHead = 0;
00304                             LPC_USB->HcInterruptStatus = OR_INTR_STATUS_WDH;
00305                         }
00306                     }
00307                 }
00308                 LPC_USB->HcRhPortStatus1 = OR_RH_PORT_CSC;
00309             }
00310             if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRSC) {
00311                 LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC;
00312             }
00313             LPC_USB->HcInterruptStatus = OR_INTR_STATUS_RHSC;
00314         }
00315 
00316         // Writeback Done Head interrupt
00317         if (int_status & OR_INTR_STATUS_WDH) {
00318             transferCompleted(usb_hcca->DoneHead & 0xFFFFFFFE);
00319             LPC_USB->HcInterruptStatus = OR_INTR_STATUS_WDH;
00320         }
00321     }
00322 }