diff options
Diffstat (limited to 'platform/drivers/src/rdc_semaphore.c')
-rw-r--r-- | platform/drivers/src/rdc_semaphore.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/platform/drivers/src/rdc_semaphore.c b/platform/drivers/src/rdc_semaphore.c new file mode 100644 index 0000000..3f97d90 --- /dev/null +++ b/platform/drivers/src/rdc_semaphore.c @@ -0,0 +1,187 @@ +/* + * Copyright (c) 2015, Freescale Semiconductor, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * o Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * o 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. + * + * o Neither the name of Freescale Semiconductor, Inc. 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 HOLDER 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. + */ + +#include <assert.h> +#include "rdc_semaphore.h" + +/******************************************************************************* + * Code + ******************************************************************************/ + +/******************************************************************************* + * Private Functions + ******************************************************************************/ +static RDC_SEMAPHORE_Type *RDC_SEMAPHORE_GetGate(uint32_t *pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + + if (*pdap < 64) + semaphore = RDC_SEMAPHORE1; + else + { + semaphore = RDC_SEMAPHORE2; + *pdap -= 64; + } + + return semaphore; +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_TryLock + * Description : Lock RDC semaphore for shared peripheral access + * + *END**************************************************************************/ +rdc_semaphore_status_t RDC_SEMAPHORE_TryLock(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + semaphore->GATE[index] = RDC_SEMAPHORE_GATE_GTFSM(RDC_SEMAPHORE_MASTER_SELF + 1); + + return ((semaphore->GATE[index] & RDC_SEMAPHORE_GATE_GTFSM_MASK) == + RDC_SEMAPHORE_GATE_GTFSM(RDC_SEMAPHORE_MASTER_SELF + 1)) ? + statusRdcSemaphoreSuccess : statusRdcSemaphoreBusy; +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_Lock + * Description : Lock RDC semaphore for shared peripheral access, polling until + * success. + * + *END**************************************************************************/ +void RDC_SEMAPHORE_Lock(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + do { + /* Wait gate status free */ + while (semaphore->GATE[index] & RDC_SEMAPHORE_GATE_GTFSM_MASK) { } + semaphore->GATE[index] = RDC_SEMAPHORE_GATE_GTFSM(RDC_SEMAPHORE_MASTER_SELF + 1); + } while ((semaphore->GATE[index] & RDC_SEMAPHORE_GATE_GTFSM_MASK) != + RDC_SEMAPHORE_GATE_GTFSM(RDC_SEMAPHORE_MASTER_SELF + 1)); +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_Unlock + * Description : Unlock RDC semaphore + * + *END**************************************************************************/ +void RDC_SEMAPHORE_Unlock(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + semaphore->GATE[index] = RDC_SEMAPHORE_GATE_GTFSM(0); +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_GetLockDomainID + * Description : Get domain ID which locks the semaphore + * + *END**************************************************************************/ +uint32_t RDC_SEMAPHORE_GetLockDomainID(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + return (semaphore->GATE[index] & RDC_SEMAPHORE_GATE_LDOM_MASK) >> RDC_SEMAPHORE_GATE_LDOM_SHIFT; +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_GetLockMaster + * Description : Get master index which locks the semaphore + * + *END**************************************************************************/ +uint32_t RDC_SEMAPHORE_GetLockMaster(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + uint8_t master; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + master = (semaphore->GATE[index] & RDC_SEMAPHORE_GATE_GTFSM_MASK) >> RDC_SEMAPHORE_GATE_GTFSM_SHIFT; + + return master == 0 ? RDC_SEMAPHORE_MASTER_NONE : master - 1; +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_Reset + * Description : Reset RDC semaphore to unlocked status + * + *END**************************************************************************/ +void RDC_SEMAPHORE_Reset(uint32_t pdap) +{ + RDC_SEMAPHORE_Type *semaphore; + uint32_t index = pdap; + + semaphore = RDC_SEMAPHORE_GetGate(&index); + + /* The reset state machine must be in idle state */ + assert ((semaphore->RSTGT_R & RDC_SEMAPHORE_RSTGT_R_RSTGSM_MASK) == 0); + + semaphore->RSTGT_W = 0xE2; + semaphore->RSTGT_W = 0x1D | RDC_SEMAPHORE_RSTGT_W_RSTGTN(index); +} + +/*FUNCTION********************************************************************** + * + * Function Name : RDC_SEMAPHORE_ResetAll + * Description : Reset all RDC semaphores to unlocked status for certain + * RDC_SEMAPHORE instance + * + *END**************************************************************************/ +void RDC_SEMAPHORE_ResetAll(RDC_SEMAPHORE_Type *base) +{ + /* The reset state machine must be in idle state */ + assert ((base->RSTGT_R & RDC_SEMAPHORE_RSTGT_R_RSTGSM_MASK) == 0); + + base->RSTGT_W = 0xE2; + base->RSTGT_W = 0x1D | RDC_SEMAPHORE_RSTGT_W_RSTGTN_MASK; +} + +/******************************************************************************* + * EOF + ******************************************************************************/ |