drv_spi_bus.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-03-27     Liuguang     the first version.
 * 2019-03-11     JiCheng      Adapt RT1020's IO MAP
 */
 
#include "drv_spi_bus.h" 

#include "fsl_common.h" 
#include "fsl_iomuxc.h" 
#include "fsl_lpspi.h" 

#if defined(RT_USING_SPIBUS1) || defined(RT_USING_SPIBUS2) || \
    defined(RT_USING_SPIBUS3) || defined(RT_USING_SPIBUS4)

#if defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL
    #error "Please don't define 'FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL'!"
#endif

#if !defined(LPSPI_CLK_SOURCE)
#define LPSPI_CLK_SOURCE         (1U) /* PLL3 PFD0 */ 
#endif
#if !defined(LPSPI_CLK_SOURCE_DIVIDER)
#define LPSPI_CLK_SOURCE_DIVIDER (8U) /* 8div */
#endif

/* LPSPI1 SCK SDO SDI IOMUX Config */
#define LPSPI1_SCK_GPIO IOMUXC_GPIO_SD_B0_02_LPSPI1_SCK

#define LPSPI1_SDO_GPIO IOMUXC_GPIO_SD_B0_04_LPSPI1_SDO

#define LPSPI1_SDI_GPIO IOMUXC_GPIO_SD_B0_05_LPSPI1_SDI


/* LPSPI2 SCK SDO SDI IOMUX Config */
#define LPSPI2_SCK_GPIO IOMUXC_GPIO_SD_B1_07_LPSPI2_SCK

#define LPSPI2_SDO_GPIO IOMUXC_GPIO_SD_B1_08_LPSPI2_SD0

#define LPSPI2_SDI_GPIO IOMUXC_GPIO_SD_B1_09_LPSPI2_SDI

/* LPSPI3 SCK SDO SDI IOMUX Config */
#define LPSPI3_SCK_GPIO IOMUXC_GPIO_AD_B1_12_LPSPI3_SCK

#define LPSPI3_SDO_GPIO IOMUXC_GPIO_AD_B1_14_LPSPI3_SDO

#define LPSPI3_SDI_GPIO IOMUXC_GPIO_AD_B1_15_LPSPI3_SDI

/* LPSPI4 SCK SDO SDI IOMUX Config */ 
#define LPSPI4_SCK_GPIO IOMUXC_GPIO_AD_B1_02_LPSPI4_SCK

#define LPSPI4_SDO_GPIO IOMUXC_GPIO_AD_B1_04_LPSPI4_SDO

#define LPSPI4_SDI_GPIO IOMUXC_GPIO_AD_B1_05_LPSPI4_SDI

struct rt1021_spi
{
    LPSPI_Type *base;
    struct rt_spi_configuration *cfg;
};

struct rt1021_sw_spi_cs
{
    rt_uint32_t pin;
};

static uint32_t rt1021_get_lpspi_freq(void)
{
    uint32_t freq = 0;

    /* CLOCK_GetMux(kCLOCK_LpspiMux):
       00b: derive clock from PLL3 PFD1 720M 
       01b: derive clock from PLL3 PFD0 720M 
       10b: derive clock from PLL2      528M 
       11b: derive clock from PLL2 PFD2 396M 
    */
    switch(CLOCK_GetMux(kCLOCK_LpspiMux))
    {
    case 0:
        freq = CLOCK_GetFreq(kCLOCK_Usb1PllPfd1Clk); 
        break; 
        
    case 1:
        freq = CLOCK_GetFreq(kCLOCK_Usb1PllPfd0Clk); 
        break; 
    
    case 2:
        freq = CLOCK_GetFreq(kCLOCK_SysPllClk); 
        break; 
    
    case 3:
        freq = CLOCK_GetFreq(kCLOCK_SysPllPfd2Clk); 
        break; 
    }
    
    freq /= (CLOCK_GetDiv(kCLOCK_LpspiDiv) + 1U); 

    return freq;
}

static rt_err_t rt1021_spi_init(LPSPI_Type *base, struct rt_spi_configuration *cfg)
{
    lpspi_master_config_t masterConfig; 
    
    RT_ASSERT(cfg != RT_NULL); 
    
    if(cfg->data_width != 8 && cfg->data_width != 16 && cfg->data_width != 32)
    {
        return RT_EINVAL; 
    }
    
#if defined(RT_USING_SPIBUS1)
    if(base == LPSPI1)
    {
        IOMUXC_SetPinMux   (LPSPI1_SCK_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI1_SCK_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI1_SDO_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI1_SDO_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI1_SDI_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI1_SDI_GPIO, 0x10B0u); 
    }
#endif 
    
#if defined(RT_USING_SPIBUS2)
    if(base == LPSPI2)
    {
        IOMUXC_SetPinMux   (LPSPI2_SCK_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI2_SCK_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI2_SDO_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI2_SDO_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI2_SDI_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI2_SDI_GPIO, 0x10B0u); 
    }
#endif 
    
#if defined(RT_USING_SPIBUS3)
    if(base == LPSPI3)
    {
        IOMUXC_SetPinMux   (LPSPI3_SCK_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI3_SCK_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI3_SDO_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI3_SDO_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI3_SDI_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI3_SDI_GPIO, 0x10B0u); 
    }
#endif 
    
#if defined(RT_USING_SPIBUS4)
    if(base == LPSPI4)
    {
        IOMUXC_SetPinMux   (LPSPI4_SCK_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI4_SCK_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI4_SDO_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI4_SDO_GPIO, 0x10B0u); 
        IOMUXC_SetPinMux   (LPSPI4_SDI_GPIO, 0U); 
        IOMUXC_SetPinConfig(LPSPI4_SDI_GPIO, 0x10B0u); 
    }
#endif 
    
    LPSPI_MasterGetDefaultConfig(&masterConfig); 
    
    if(cfg->max_hz > 40*1000*1000)
    {
        cfg->max_hz = 40*1000*1000;
    }
    masterConfig.baudRate     = cfg->max_hz; 
    masterConfig.bitsPerFrame = cfg->data_width; 
    
    if(cfg->mode & RT_SPI_MSB)
    {
        masterConfig.direction = kLPSPI_MsbFirst; 
    }
    else
    {
        masterConfig.direction = kLPSPI_LsbFirst; 
    }
    
    if(cfg->mode & RT_SPI_CPHA)
    {
        masterConfig.cpha = kLPSPI_ClockPhaseSecondEdge; 
    }
    else
    {
        masterConfig.cpha = kLPSPI_ClockPhaseFirstEdge; 
    }
    
    if(cfg->mode & RT_SPI_CPOL)
    {
        masterConfig.cpol = kLPSPI_ClockPolarityActiveLow; 
    }
    else
    {
        masterConfig.cpol = kLPSPI_ClockPolarityActiveHigh; 
    }
    
    masterConfig.pinCfg                        = kLPSPI_SdiInSdoOut; 
    masterConfig.dataOutConfig                 = kLpspiDataOutTristate;
    masterConfig.pcsToSckDelayInNanoSec        = 1000000000 / masterConfig.baudRate; 
    masterConfig.lastSckToPcsDelayInNanoSec    = 1000000000 / masterConfig.baudRate; 
    masterConfig.betweenTransferDelayInNanoSec = 1000000000 / masterConfig.baudRate; 
    
    LPSPI_MasterInit(base, &masterConfig, rt1021_get_lpspi_freq()); 
    base->CFGR1 |= LPSPI_CFGR1_PCSCFG_MASK; 
    
    return RT_EOK; 
}

rt_err_t rt1021_spi_bus_attach_device(const char *bus_name, const char *device_name, rt_uint32_t pin)
{
    rt_err_t ret = RT_EOK; 
    
    struct rt_spi_device *spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device)); 
    RT_ASSERT(spi_device != RT_NULL); 
    
    struct rt1021_sw_spi_cs *cs_pin = (struct rt1021_sw_spi_cs *)rt_malloc(sizeof(struct rt1021_sw_spi_cs)); 
    RT_ASSERT(cs_pin != RT_NULL);
    
    cs_pin->pin = pin;
    rt_pin_mode(pin, PIN_MODE_OUTPUT); 
    rt_pin_write(pin, PIN_HIGH); 
    
    ret = rt_spi_bus_attach_device(spi_device, device_name, bus_name, (void *)cs_pin); 
    
    return ret; 
}

static rt_err_t spi_configure(struct rt_spi_device *device, struct rt_spi_configuration *cfg)
{
    rt_err_t ret = RT_EOK; 
    struct rt1021_spi *spi = RT_NULL; 
    
    RT_ASSERT(cfg != RT_NULL);
    RT_ASSERT(device != RT_NULL);
    
    spi = (struct rt1021_spi *)(device->bus->parent.user_data); 
    spi->cfg = cfg; 
    ret = rt1021_spi_init(spi->base, cfg); 
    
    return ret;
}

static rt_uint32_t spixfer(struct rt_spi_device *device, struct rt_spi_message *message)
{
    lpspi_transfer_t transfer; 
    
    RT_ASSERT(device != RT_NULL);
    RT_ASSERT(device->bus != RT_NULL);
    RT_ASSERT(device->bus->parent.user_data != RT_NULL);
    
    struct rt1021_spi *spi = (struct rt1021_spi *)(device->bus->parent.user_data); 
    struct rt1021_sw_spi_cs *cs = device->parent.user_data; 
    
    if(message->cs_take)
    {
        rt_pin_write(cs->pin, PIN_LOW);
    }
    
    transfer.dataSize = message->length; 
    transfer.rxData   = (uint8_t *)(message->recv_buf); 
    transfer.txData   = (uint8_t *)(message->send_buf); 
    
    LPSPI_MasterTransferBlocking(spi->base, &transfer); 
    
    if(message->cs_release)
    {
        rt_pin_write(cs->pin, PIN_HIGH);
    }
    
    return message->length; 
}

#if defined(RT_USING_SPIBUS1)
static struct rt1021_spi spi1 = 
{
    .base = LPSPI1
}; 
static struct rt_spi_bus spi1_bus = 
{
    .parent.user_data = &spi1
}; 
#endif

#if defined(RT_USING_SPIBUS2)
static struct rt1021_spi spi2 = 
{
    .base = LPSPI2
}; 
static struct rt_spi_bus spi2_bus = 
{
    .parent.user_data = &spi2
}; 
#endif

#if defined(RT_USING_SPIBUS3)
static struct rt1021_spi spi3 = 
{
    .base = LPSPI3
}; 
static struct rt_spi_bus spi3_bus = 
{
    .parent.user_data = &spi3
}; 
#endif

#if defined(RT_USING_SPIBUS4)
static struct rt1021_spi spi4 = 
{
    .base = LPSPI4
}; 
static struct rt_spi_bus spi4_bus = 
{
    .parent.user_data = &spi4
}; 
#endif

static struct rt_spi_ops rt1021_spi_ops = 
{
    .configure = spi_configure, 
    .xfer      = spixfer
}; 
 
int rt_hw_spi_bus_init(void)
{
    CLOCK_SetMux(kCLOCK_LpspiMux, LPSPI_CLK_SOURCE);
    CLOCK_SetDiv(kCLOCK_LpspiDiv, LPSPI_CLK_SOURCE_DIVIDER-1); 
    
    CLOCK_EnableClock(kCLOCK_Iomuxc); 
    
#if defined(RT_USING_SPIBUS1)
    rt_spi_bus_register(&spi1_bus, "spi1", &rt1021_spi_ops); 
#endif
    
#if defined(RT_USING_SPIBUS2)
    rt_spi_bus_register(&spi2_bus, "spi2", &rt1021_spi_ops); 
#endif
    
#if defined(RT_USING_SPIBUS3)
    rt_spi_bus_register(&spi3_bus, "spi3", &rt1021_spi_ops); 
#endif
    
#if defined(RT_USING_SPIBUS4)
    rt_spi_bus_register(&spi4_bus, "spi4", &rt1021_spi_ops); 
#endif
    
    return RT_EOK; 
}
INIT_BOARD_EXPORT(rt_hw_spi_bus_init); 

#endif