358 lines
9.1 KiB
C
358 lines
9.1 KiB
C
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/*
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* File : drv_spi_bus.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006-2013, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2018-03-27 Liuguang the first version.
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*/
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#include "drv_spi_bus.h"
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#include "fsl_common.h"
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#include "fsl_iomuxc.h"
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#include "fsl_lpspi.h"
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#if defined(RT_USING_SPIBUS1) || defined(RT_USING_SPIBUS2) || \
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defined(RT_USING_SPIBUS3) || defined(RT_USING_SPIBUS4)
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#if defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL
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#error "Please don't define 'FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL'!"
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#endif
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#if !defined(LPSPI_CLK_SOURCE)
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#define LPSPI_CLK_SOURCE (1U) /* PLL3 PFD0 */
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#endif
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#if !defined(LPSPI_CLK_SOURCE_DIVIDER)
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#define LPSPI_CLK_SOURCE_DIVIDER (8U) /* 8div */
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#endif
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/* LPSPI1 SCK SDO SDI IOMUX Config */
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#define LPSPI1_SCK_GPIO IOMUXC_GPIO_SD_B0_02_LPSPI1_SCK
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#define LPSPI1_SDO_GPIO IOMUXC_GPIO_SD_B0_04_LPSPI1_SDO
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#define LPSPI1_SDI_GPIO IOMUXC_GPIO_SD_B0_05_LPSPI1_SDI
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/* LPSPI2 SCK SDO SDI IOMUX Config */
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#define LPSPI2_SCK_GPIO IOMUXC_GPIO_SD_B1_07_LPSPI2_SCK
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#define LPSPI2_SDO_GPIO IOMUXC_GPIO_SD_B1_08_LPSPI2_SD0
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#define LPSPI2_SDI_GPIO IOMUXC_GPIO_SD_B1_09_LPSPI2_SDI
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/* LPSPI3 SCK SDO SDI IOMUX Config */
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#define LPSPI3_SCK_GPIO IOMUXC_GPIO_AD_B1_12_LPSPI3_SCK
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#define LPSPI3_SDO_GPIO IOMUXC_GPIO_AD_B1_14_LPSPI3_SDO
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#define LPSPI3_SDI_GPIO IOMUXC_GPIO_AD_B1_15_LPSPI3_SDI
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/* LPSPI4 SCK SDO SDI IOMUX Config */
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#define LPSPI4_SCK_GPIO IOMUXC_GPIO_AD_B1_02_LPSPI4_SCK
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#define LPSPI4_SDO_GPIO IOMUXC_GPIO_AD_B1_04_LPSPI4_SDO
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#define LPSPI4_SDI_GPIO IOMUXC_GPIO_AD_B1_05_LPSPI4_SDI
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struct rt1021_spi
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{
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LPSPI_Type *base;
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struct rt_spi_configuration *cfg;
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};
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struct rt1021_sw_spi_cs
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{
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rt_uint32_t pin;
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};
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static uint32_t rt1021_get_lpspi_freq(void)
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{
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uint32_t freq = 0;
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/* CLOCK_GetMux(kCLOCK_LpspiMux):
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00b: derive clock from PLL3 PFD1 720M
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01b: derive clock from PLL3 PFD0 720M
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10b: derive clock from PLL2 528M
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11b: derive clock from PLL2 PFD2 396M
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*/
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switch(CLOCK_GetMux(kCLOCK_LpspiMux))
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{
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case 0:
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freq = CLOCK_GetFreq(kCLOCK_Usb1PllPfd1Clk);
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break;
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case 1:
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freq = CLOCK_GetFreq(kCLOCK_Usb1PllPfd0Clk);
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break;
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case 2:
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freq = CLOCK_GetFreq(kCLOCK_SysPllClk);
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break;
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case 3:
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freq = CLOCK_GetFreq(kCLOCK_SysPllPfd2Clk);
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break;
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}
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freq /= (CLOCK_GetDiv(kCLOCK_LpspiDiv) + 1U);
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return freq;
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}
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static rt_err_t rt1021_spi_init(LPSPI_Type *base, struct rt_spi_configuration *cfg)
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{
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lpspi_master_config_t masterConfig;
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RT_ASSERT(cfg != RT_NULL);
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if(cfg->data_width != 8 && cfg->data_width != 16 && cfg->data_width != 32)
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{
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return RT_EINVAL;
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}
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#if defined(RT_USING_SPIBUS1)
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if(base == LPSPI1)
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{
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IOMUXC_SetPinMux (LPSPI1_SCK_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI1_SCK_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI1_SDO_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI1_SDO_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI1_SDI_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI1_SDI_GPIO, 0x10B0u);
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}
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#endif
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#if defined(RT_USING_SPIBUS2)
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if(base == LPSPI2)
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{
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IOMUXC_SetPinMux (LPSPI2_SCK_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI2_SCK_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI2_SDO_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI2_SDO_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI2_SDI_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI2_SDI_GPIO, 0x10B0u);
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}
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#endif
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#if defined(RT_USING_SPIBUS3)
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if(base == LPSPI3)
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{
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IOMUXC_SetPinMux (LPSPI3_SCK_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI3_SCK_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI3_SDO_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI3_SDO_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI3_SDI_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI3_SDI_GPIO, 0x10B0u);
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}
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#endif
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#if defined(RT_USING_SPIBUS4)
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if(base == LPSPI4)
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{
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IOMUXC_SetPinMux (LPSPI4_SCK_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI4_SCK_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI4_SDO_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI4_SDO_GPIO, 0x10B0u);
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IOMUXC_SetPinMux (LPSPI4_SDI_GPIO, 0U);
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IOMUXC_SetPinConfig(LPSPI4_SDI_GPIO, 0x10B0u);
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}
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#endif
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LPSPI_MasterGetDefaultConfig(&masterConfig);
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if(cfg->max_hz > 40*1000*1000)
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{
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cfg->max_hz = 40*1000*1000;
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}
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masterConfig.baudRate = cfg->max_hz;
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masterConfig.bitsPerFrame = cfg->data_width;
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if(cfg->mode & RT_SPI_MSB)
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{
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masterConfig.direction = kLPSPI_MsbFirst;
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}
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else
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{
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masterConfig.direction = kLPSPI_LsbFirst;
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}
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if(cfg->mode & RT_SPI_CPHA)
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{
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masterConfig.cpha = kLPSPI_ClockPhaseSecondEdge;
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}
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else
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{
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masterConfig.cpha = kLPSPI_ClockPhaseFirstEdge;
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}
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if(cfg->mode & RT_SPI_CPOL)
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{
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masterConfig.cpol = kLPSPI_ClockPolarityActiveLow;
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}
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else
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{
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masterConfig.cpol = kLPSPI_ClockPolarityActiveHigh;
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}
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masterConfig.pinCfg = kLPSPI_SdiInSdoOut;
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masterConfig.dataOutConfig = kLpspiDataOutTristate;
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masterConfig.pcsToSckDelayInNanoSec = 1000000000 / masterConfig.baudRate;
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masterConfig.lastSckToPcsDelayInNanoSec = 1000000000 / masterConfig.baudRate;
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masterConfig.betweenTransferDelayInNanoSec = 1000000000 / masterConfig.baudRate;
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LPSPI_MasterInit(base, &masterConfig, rt1021_get_lpspi_freq());
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base->CFGR1 |= LPSPI_CFGR1_PCSCFG_MASK;
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return RT_EOK;
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}
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rt_err_t rt1021_spi_bus_attach_device(const char *bus_name, const char *device_name, rt_uint32_t pin)
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{
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rt_err_t ret = RT_EOK;
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struct rt_spi_device *spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
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RT_ASSERT(spi_device != RT_NULL);
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struct rt1021_sw_spi_cs *cs_pin = (struct rt1021_sw_spi_cs *)rt_malloc(sizeof(struct rt1021_sw_spi_cs));
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RT_ASSERT(cs_pin != RT_NULL);
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cs_pin->pin = pin;
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rt_pin_mode(pin, PIN_MODE_OUTPUT);
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rt_pin_write(pin, PIN_HIGH);
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ret = rt_spi_bus_attach_device(spi_device, device_name, bus_name, (void *)cs_pin);
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return ret;
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}
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static rt_err_t spi_configure(struct rt_spi_device *device, struct rt_spi_configuration *cfg)
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{
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rt_err_t ret = RT_EOK;
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struct rt1021_spi *spi = RT_NULL;
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RT_ASSERT(cfg != RT_NULL);
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RT_ASSERT(device != RT_NULL);
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spi = (struct rt1021_spi *)(device->bus->parent.user_data);
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spi->cfg = cfg;
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ret = rt1021_spi_init(spi->base, cfg);
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return ret;
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}
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static rt_uint32_t spixfer(struct rt_spi_device *device, struct rt_spi_message *message)
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{
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lpspi_transfer_t transfer;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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RT_ASSERT(device->bus->parent.user_data != RT_NULL);
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struct rt1021_spi *spi = (struct rt1021_spi *)(device->bus->parent.user_data);
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struct rt1021_sw_spi_cs *cs = device->parent.user_data;
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if(message->cs_take)
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{
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rt_pin_write(cs->pin, PIN_LOW);
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}
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transfer.dataSize = message->length;
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transfer.rxData = (uint8_t *)(message->recv_buf);
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transfer.txData = (uint8_t *)(message->send_buf);
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LPSPI_MasterTransferBlocking(spi->base, &transfer);
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if(message->cs_release)
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{
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rt_pin_write(cs->pin, PIN_HIGH);
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}
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return message->length;
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}
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#if defined(RT_USING_SPIBUS1)
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static struct rt1021_spi spi1 =
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{
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.base = LPSPI1
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};
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static struct rt_spi_bus spi1_bus =
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{
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.parent.user_data = &spi1
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};
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#endif
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#if defined(RT_USING_SPIBUS2)
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static struct rt1021_spi spi2 =
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{
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.base = LPSPI2
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};
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static struct rt_spi_bus spi2_bus =
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{
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.parent.user_data = &spi2
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};
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#endif
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#if defined(RT_USING_SPIBUS3)
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static struct rt1021_spi spi3 =
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{
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.base = LPSPI3
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};
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static struct rt_spi_bus spi3_bus =
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{
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.parent.user_data = &spi3
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};
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#endif
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#if defined(RT_USING_SPIBUS4)
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static struct rt1021_spi spi4 =
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{
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.base = LPSPI4
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};
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static struct rt_spi_bus spi4_bus =
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{
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.parent.user_data = &spi4
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};
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#endif
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static struct rt_spi_ops rt1021_spi_ops =
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{
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.configure = spi_configure,
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.xfer = spixfer
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};
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int rt_hw_spi_bus_init(void)
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{
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CLOCK_SetMux(kCLOCK_LpspiMux, LPSPI_CLK_SOURCE);
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CLOCK_SetDiv(kCLOCK_LpspiDiv, LPSPI_CLK_SOURCE_DIVIDER-1);
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CLOCK_EnableClock(kCLOCK_Iomuxc);
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#if defined(RT_USING_SPIBUS1)
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rt_spi_bus_register(&spi1_bus, "spi1", &rt1021_spi_ops);
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#endif
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#if defined(RT_USING_SPIBUS2)
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rt_spi_bus_register(&spi2_bus, "spi2", &rt1021_spi_ops);
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#endif
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#if defined(RT_USING_SPIBUS3)
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rt_spi_bus_register(&spi3_bus, "spi3", &rt1021_spi_ops);
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#endif
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#if defined(RT_USING_SPIBUS4)
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rt_spi_bus_register(&spi4_bus, "spi4", &rt1021_spi_ops);
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#endif
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return RT_EOK;
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}
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INIT_BOARD_EXPORT(rt_hw_spi_bus_init);
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#endif
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