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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <bl.h>
     18 #include <hostIntf.h>
     19 #include <hostIntf_priv.h>
     20 
     21 #include <variant/variant.h>
     22 
     23 #include <plat/cmsis.h>
     24 #include <plat/spi.h>
     25 #include <plat/exti.h>
     26 #include <plat/syscfg.h>
     27 
     28 static struct Gpio *mShWakeupGpio;
     29 static struct ChainedIsr mShWakeupIsr;
     30 
     31 static bool platWakeupIsr(struct ChainedIsr *isr)
     32 {
     33     if (!extiIsPendingGpio(mShWakeupGpio))
     34         return false;
     35 
     36     extiClearPendingGpio(mShWakeupGpio);
     37 
     38     hostIntfRxPacket(!gpioGet(mShWakeupGpio));
     39 
     40     return true;
     41 }
     42 
     43 const struct HostIntfComm *platHostIntfInit()
     44 {
     45     uint32_t priorityGroup = NVIC_GetPriorityGrouping();
     46     uint32_t priority, preemptPriority, subPriority;
     47     enum IRQn rx, tx;
     48     const struct HostIntfComm *ret = NULL;
     49 
     50 #if defined(PLATFORM_HOST_INTF_I2C_BUS)
     51     ret = hostIntfI2cInit(PLATFORM_HOST_INTF_I2C_BUS);
     52 #elif defined(PLATFORM_HOST_INTF_SPI_BUS)
     53     ret = hostIntfSpiInit(PLATFORM_HOST_INTF_SPI_BUS);
     54 
     55     /* get the rx and tx irq numbers used by the host spi bus */
     56     ret->request();
     57     rx = spiRxIrq(PLATFORM_HOST_INTF_SPI_BUS);
     58     tx = spiTxIrq(PLATFORM_HOST_INTF_SPI_BUS);
     59     ret->release();
     60 
     61     /* make the tx and rx dma isrs execute before other isrs when multiple
     62        interrupts are pending (if avaliable subpriority bits).
     63        We do not change the preempt priority */
     64     priority = NVIC_GetPriority(rx);
     65     NVIC_DecodePriority (priority, priorityGroup, &preemptPriority, &subPriority);
     66     if (&subPriority > 0)
     67         subPriority --;
     68     NVIC_SetPriority(rx, NVIC_EncodePriority(priorityGroup, preemptPriority, subPriority));
     69 
     70     priority = NVIC_GetPriority(tx);
     71     NVIC_DecodePriority (priority, priorityGroup, &preemptPriority, &subPriority);
     72     if (&subPriority > 0)
     73         subPriority --;
     74     NVIC_SetPriority(tx, NVIC_EncodePriority(priorityGroup, preemptPriority, subPriority));
     75 
     76     mShWakeupGpio = gpioRequest(SH_INT_WAKEUP);
     77     gpioConfigInput(mShWakeupGpio, GPIO_SPEED_LOW, GPIO_PULL_NONE);
     78     syscfgSetExtiPort(mShWakeupGpio);
     79     extiEnableIntGpio(mShWakeupGpio, EXTI_TRIGGER_BOTH);
     80     mShWakeupIsr.func = platWakeupIsr;
     81     extiChainIsr(SH_EXTI_WAKEUP_IRQ, &mShWakeupIsr);
     82 #else
     83 #error "No host interface bus specified"
     84 #endif
     85     return ret;
     86 }
     87 
     88 uint16_t platHwType(void)
     89 {
     90     return PLATFORM_HW_TYPE;
     91 }
     92 
     93 uint16_t platHwVer(void)
     94 {
     95     return PLATFORM_HW_VER;
     96 }
     97 
     98 uint16_t platBlVer()
     99 {
    100     return BL.blGetVersion();
    101 }
    102