diff options
Diffstat (limited to 'drivers/src/fsl_flexbus.c')
| -rw-r--r-- | drivers/src/fsl_flexbus.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/src/fsl_flexbus.c b/drivers/src/fsl_flexbus.c new file mode 100644 index 0000000..4e29285 --- /dev/null +++ b/drivers/src/fsl_flexbus.c @@ -0,0 +1,196 @@ +/* + * 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 "fsl_flexbus.h" + +/******************************************************************************* + * Prototypes + ******************************************************************************/ + +/*! + * @brief Gets the instance from the base address + * + * @param base FLEXBUS peripheral base address + * + * @return The FLEXBUS instance + */ +static uint32_t FLEXBUS_GetInstance(FB_Type *base); + +/******************************************************************************* + * Variables + ******************************************************************************/ + +/*! @brief Pointers to FLEXBUS bases for each instance. */ +static FB_Type *const s_flexbusBases[] = FB_BASE_PTRS; + +/*! @brief Pointers to FLEXBUS clocks for each instance. */ +static const clock_ip_name_t s_flexbusClocks[] = FLEXBUS_CLOCKS; + +/******************************************************************************* + * Code + ******************************************************************************/ + +static uint32_t FLEXBUS_GetInstance(FB_Type *base) +{ + uint32_t instance; + + /* Find the instance index from base address mappings. */ + for (instance = 0; instance < FSL_FEATURE_SOC_FB_COUNT; instance++) + { + if (s_flexbusBases[instance] == base) + { + break; + } + } + + assert(instance < FSL_FEATURE_SOC_FB_COUNT); + + return instance; +} + +void FLEXBUS_Init(FB_Type *base, const flexbus_config_t *config) +{ + assert(config != NULL); + assert(config->chip < FB_CSAR_COUNT); + assert(config->waitStates <= 0x3FU); + + uint32_t chip = 0; + uint32_t reg_value = 0; + + /* Ungate clock for FLEXBUS */ + CLOCK_EnableClock(s_flexbusClocks[FLEXBUS_GetInstance(base)]); + + /* Reset all the register to default state */ + for (chip = 0; chip < FB_CSAR_COUNT; chip++) + { + /* Reset CSMR register, all chips not valid (disabled) */ + base->CS[chip].CSMR = 0x0000U; + /* Set default base address */ + base->CS[chip].CSAR &= (~FB_CSAR_BA_MASK); + /* Reset FB_CSCRx register */ + base->CS[chip].CSCR = 0x0000U; + } + /* Set FB_CSPMCR register */ + /* FlexBus signal group 1 multiplex control */ + reg_value |= kFLEXBUS_MultiplexGroup1_FB_ALE << FB_CSPMCR_GROUP1_SHIFT; + /* FlexBus signal group 2 multiplex control */ + reg_value |= kFLEXBUS_MultiplexGroup2_FB_CS4 << FB_CSPMCR_GROUP2_SHIFT; + /* FlexBus signal group 3 multiplex control */ + reg_value |= kFLEXBUS_MultiplexGroup3_FB_CS5 << FB_CSPMCR_GROUP3_SHIFT; + /* FlexBus signal group 4 multiplex control */ + reg_value |= kFLEXBUS_MultiplexGroup4_FB_TBST << FB_CSPMCR_GROUP4_SHIFT; + /* FlexBus signal group 5 multiplex control */ + reg_value |= kFLEXBUS_MultiplexGroup5_FB_TA << FB_CSPMCR_GROUP5_SHIFT; + /* Write to CSPMCR register */ + base->CSPMCR = reg_value; + + /* Update chip value */ + chip = config->chip; + + /* Base address */ + reg_value = config->chipBaseAddress; + /* Write to CSAR register */ + base->CS[chip].CSAR = reg_value; + /* Chip-select validation */ + reg_value = 0x1U << FB_CSMR_V_SHIFT; + /* Write protect */ + reg_value |= (uint32_t)(config->writeProtect) << FB_CSMR_WP_SHIFT; + /* Base address mask */ + reg_value |= config->chipBaseAddressMask << FB_CSMR_BAM_SHIFT; + /* Write to CSMR register */ + base->CS[chip].CSMR = reg_value; + /* Burst write */ + reg_value = (uint32_t)(config->burstWrite) << FB_CSCR_BSTW_SHIFT; + /* Burst read */ + reg_value |= (uint32_t)(config->burstRead) << FB_CSCR_BSTR_SHIFT; + /* Byte-enable mode */ + reg_value |= (uint32_t)(config->byteEnableMode) << FB_CSCR_BEM_SHIFT; + /* Port size */ + reg_value |= (uint32_t)config->portSize << FB_CSCR_PS_SHIFT; + /* The internal transfer acknowledge for accesses */ + reg_value |= (uint32_t)(config->autoAcknowledge) << FB_CSCR_AA_SHIFT; + /* Byte-Lane shift */ + reg_value |= (uint32_t)config->byteLaneShift << FB_CSCR_BLS_SHIFT; + /* The number of wait states */ + reg_value |= (uint32_t)config->waitStates << FB_CSCR_WS_SHIFT; + /* Write address hold or deselect */ + reg_value |= (uint32_t)config->writeAddressHold << FB_CSCR_WRAH_SHIFT; + /* Read address hold or deselect */ + reg_value |= (uint32_t)config->readAddressHold << FB_CSCR_RDAH_SHIFT; + /* Address setup */ + reg_value |= (uint32_t)config->addressSetup << FB_CSCR_ASET_SHIFT; + /* Extended transfer start/extended address latch */ + reg_value |= (uint32_t)(config->extendTransferAddress) << FB_CSCR_EXTS_SHIFT; + /* Secondary wait state */ + reg_value |= (uint32_t)(config->secondaryWaitStates) << FB_CSCR_SWSEN_SHIFT; + /* Write to CSCR register */ + base->CS[chip].CSCR = reg_value; + /* FlexBus signal group 1 multiplex control */ + reg_value = (uint32_t)config->group1MultiplexControl << FB_CSPMCR_GROUP1_SHIFT; + /* FlexBus signal group 2 multiplex control */ + reg_value |= (uint32_t)config->group2MultiplexControl << FB_CSPMCR_GROUP2_SHIFT; + /* FlexBus signal group 3 multiplex control */ + reg_value |= (uint32_t)config->group3MultiplexControl << FB_CSPMCR_GROUP3_SHIFT; + /* FlexBus signal group 4 multiplex control */ + reg_value |= (uint32_t)config->group4MultiplexControl << FB_CSPMCR_GROUP4_SHIFT; + /* FlexBus signal group 5 multiplex control */ + reg_value |= (uint32_t)config->group5MultiplexControl << FB_CSPMCR_GROUP5_SHIFT; + /* Write to CSPMCR register */ + base->CSPMCR = reg_value; +} + +void FLEXBUS_Deinit(FB_Type *base) +{ + /* Gate clock for FLEXBUS */ + CLOCK_DisableClock(s_flexbusClocks[FLEXBUS_GetInstance(base)]); +} + +void FLEXBUS_GetDefaultConfig(flexbus_config_t *config) +{ + config->chip = 0; /* Chip 0 FlexBus for validation */ + config->writeProtect = 0; /* Write accesses are allowed */ + config->burstWrite = 0; /* Burst-Write disable */ + config->burstRead = 0; /* Burst-Read disable */ + config->byteEnableMode = 0; /* Byte-Enable mode is asserted for data write only */ + config->autoAcknowledge = true; /* Auto-Acknowledge enable */ + config->extendTransferAddress = 0; /* Extend transfer start/extend address latch disable */ + config->secondaryWaitStates = 0; /* Secondary wait state disable */ + config->byteLaneShift = kFLEXBUS_NotShifted; /* Byte-Lane shift disable */ + config->writeAddressHold = kFLEXBUS_Hold1Cycle; /* Write address hold 1 cycles */ + config->readAddressHold = kFLEXBUS_Hold1Or0Cycles; /* Read address hold 0 cycles */ + config->addressSetup = + kFLEXBUS_FirstRisingEdge; /* Assert ~FB_CSn on the first rising clock edge after the address is asserted */ + config->portSize = kFLEXBUS_1Byte; /* 1 byte port size of transfer */ + config->group1MultiplexControl = kFLEXBUS_MultiplexGroup1_FB_ALE; /* FB_ALE */ + config->group2MultiplexControl = kFLEXBUS_MultiplexGroup2_FB_CS4; /* FB_CS4 */ + config->group3MultiplexControl = kFLEXBUS_MultiplexGroup3_FB_CS5; /* FB_CS5 */ + config->group4MultiplexControl = kFLEXBUS_MultiplexGroup4_FB_TBST; /* FB_TBST */ + config->group5MultiplexControl = kFLEXBUS_MultiplexGroup5_FB_TA; /* FB_TA */ +} |