rt-thread/bsp/cvitek/drivers/drv_spi.h

/*
 * Copyright (c) 2006-2024, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2024-03-28      qiujingbao   first version
 */
#ifndef __DRV_SPI_H__
#define __DRV_SPI_H__

#include "rtdevice.h"
#include <rthw.h>
#include <rtthread.h>

#include "mmio.h"
#include "pinctrl.h"

#define SPI0 0x0
#define SPI1 0x1
#define SPI2 0x2
#define SPI3 0x3

#define SPI0_BASE 0x04180000
#define SPI1_BASE 0x04190000
#define SPI2_BASE 0x041A0000
#define SPI3_BASE 0x041B0000

#define SPI_IRQ_MSAK 0x3e
#define SPI_FREQUENCY 187500000

/* Transmit FiFO Threshold Level */
#define SPI_TXFTLR 0xf

#define SPI_CTRL0_DATA_FREAM_SHIFT 0
#define SPI_CTRL0_FREAM_FORMAT_SHIFT 4
#define SPI_CTRL0_CPHA_SHIFT 6
#define SPI_CTRL0_CPOL_SHIFT 7
#define SPI_CTRL0_TRANS_MODE 8
#define SPI_CTRL0_LOOP_SHIFT 11
#define SPI_CTRL0_CTRL_FREAM_SHIFT 12

struct cv1800_spi {
    uint8_t spi_id;
    char *device_name;

    uint8_t fifo_len;
    uint8_t data_width;

    const void *send_buf;
    void *recv_buf;

    const void *send_end;
    void *recv_end;

    struct rt_spi_bus spi_bus;
    struct spi_regs *reg;
};

struct spi_regs {
    uint32_t spi_ctrl0;         // 0x00
    uint32_t spi_ctrl1;         // 0x04
    uint32_t spi_ssienr;        // 0x08
    uint32_t spi_mwcr;          // 0x0c
    uint32_t spi_ser;           // 0x10
    uint32_t spi_baudr;         // 0x14
    uint32_t spi_txftlr;        // 0x18
    uint32_t spi_rxftlr;        // 0x1c
    uint32_t spi_txflr;         // 0x20
    uint32_t spi_rxflr;         // 0x24
    uint32_t spi_sr;            // 0x28
    uint32_t spi_imr;           // 0x2c
    uint32_t spi_isr;           // 0x30
    uint32_t spi_risr;          // 0x34
    uint32_t spi_txoicr;        // 0x38
    uint32_t spi_rxoicr;        // 0x3c
    uint32_t spi_rxuicr;        // 0x40
    uint32_t spi_msticr;        // 0x44
    uint32_t spi_icr;           // 0x48
    uint32_t spi_dmacr;         // 0x4c
    uint32_t spi_dmatdlr;       // 0x50
    uint32_t spi_dmardlr;       // 0x54
    uint32_t spi_idr;           // 0x58
    uint32_t spi_version;       // 0x5c
    uint32_t spi_dr;            // 0x60
    uint32_t spi_rx_sample_dly; // 0xf0
    uint32_t spi_cs_override;   // 0xf4
};

uint32_t gen_spi_mode(struct rt_spi_configuration *cfg, uint32_t *mode)
{
    uint32_t value = 0;

    if (cfg->data_width != 8 && cfg->data_width != 16)
        return -1;

    value |= (cfg->data_width - 1) >> SPI_CTRL0_DATA_FREAM_SHIFT;
    value |= cfg->mode >> SPI_CTRL0_CPHA_SHIFT;

    *mode = value;
    return 0;
}

/* set spi mode */
static inline void spi_set_mode(struct spi_regs *reg, uint32_t mode)
{
    mmio_write_32((uintptr_t)&reg->spi_ctrl0, mode);
}

/* clear irq */
static inline void spi_clear_irq(struct spi_regs *reg, uint32_t mode)
{
    mmio_write_32((uintptr_t)&reg->spi_imr, mode);
}

static inline void spi_enable_cs(struct spi_regs *reg, uint32_t enable)
{
    if (enable)
        enable = 0x1;
    else
        enable = 0x0;

    mmio_write_32((uintptr_t)&reg->spi_ser, enable);
}

/* set spi frequency*/
static inline rt_err_t spi_set_frequency(struct spi_regs *reg, uint32_t speed)
{
    uint16_t value;

    /* The value of the BAUDR register must be an even number between 2-65534 */
    value = SPI_FREQUENCY / speed;
    if (value % 2 != 0)
        value++;

    if (value < 4 || value > 65534)
        value = 4;

    mmio_write_32((uintptr_t)&reg->spi_baudr, value);

    return RT_EOK;
}

static inline void spi_enable(struct spi_regs *reg, uint32_t enable)
{
    if (enable)
        enable = 0x1;
    else
        enable = 0x0;

    mmio_write_32((uintptr_t)&reg->spi_ssienr, enable);
}

#endif /* __DRV_SPI_H__ */