MPI

MPI HAL 提供用于访问 MPI 外设寄存器的基本 API，它用作 PRO 上的FLASH/PSRAM控制器。 有 2 级 HAL 接口，bf0_hal_mpi 和 bf0_hal_mpi_ex。
Hal_mpi 用于访问硬件寄存器的接口，只包含很少的逻辑，对于 XIP 模式，这个文件应该放在 RAM 中。 Hal_mpi_ex 用于基本 NAND/NOR/PSRAM 功能包装器，包括初始化/页面读取/页面写入/扇区擦除和一些其他功能。

主要功能包括：

- 最多支持 5 个实例(其中MPI5可挂载到LCPU)。
- 可支持NAND/NOR/PSRAM。
- DMA 支持。
- 通过寄存器命令表支持多芯片。

内存地址映射：

• MPI1: C-BUS from 0x10000000 to 0x11FFFFFF(total 32MB). S-BUS: from 0x60000000 to 0x61FFFFFF(total 32MB)
  
• MPI2: C-BUS from 0x12000000 to 0x13FFFFFF(total 32MB). S-BUS: from 0x62000000 to 0x63FFFFFF(total 32MB).
  
• MPI3: C-BUS from 0x14000000 to 0x17FFFFFF(total 64MB). S-BUS: from 0x64000000 to 0x67FFFFFF(total 64MB)
  
• MPI4: C-BUS from 0x18000000 to 0x1BFFFFFF(total 64MB). S-BUS: from 0x68000000 to 0x9FFFFFFF(total 896MB)
  
• MPI5: C-BUS from 0x1C000000 to 0x1FFFFFFF(total 64MB).
  

使用 MPI HAL 驱动程序

MPI 可用于控制 NOR-FLASH、NAND-FLASH、8-LINE PSRAM、16-LINE PSRAM。 以下是 NOR-FLASH 的示例：

// register command table to support more flash chip
spi_flash_register_cmd();
 
QSPI_FLASH_CTX_T spi_flash_handle[FLASH_MAX_INSTANCE];
qspi_configure_t flash_cfg = FLASH1_CONFIG;
struct dma_config flash_dma = FLASH1_DMA_CONFIG;
 
flash_cfg.Instance = FLASH1;
flash_cfg.SpiMode = SPI_MODE_NOR;
flash_cfg.line = 2;
flash_cfg.base = MPI1_MEM_BASE;
 
flash_dma.dma_rcc = FLASH1_DMA_RCC; // 0
flash_dma.Instance = FLASH1_DMA_INSTANCE; //DMA1_Channel1
flash_dma.dma_irq = FLASH1_DMA_IRQ; //DMAC1_CH1_IRQn
flash_dma.request = FLASH1_DMA_REQUEST; //DMA_REQUEST_0
 
// init MPI hardware controller 
flash_cfg.SpiMode = 0; // 0 for nor and 1 for nand, 2 for qspi psram, 3 for opi psram, 4 for hpi psram
res = HAL_FLASH_Init(&(spi_flash_handle[0]), &flash_cfg, &spi_flash_dma_handle[0], &flash_dma, BSP_GetFlash1DIV());
if (res != HAL_OK)
    return error;
 
FLASH_HandleTypeDef hflash = &spi_flash_handle[0].handle;
// erase sector 
res = HAL_QSPIEX_SECT_ERASE(hflash, addr);
if (res < 0)
    return error;
 
// write a page 
res = HAL_QSPIEX_WRITE_PAGE(hflash, addr, buf, size);
if (res != size)
    return error;
 
// read data, it can use AHB read 
res = nor_read_rom(hflash, addr, buf, size);
 
...

以下是 NAND-FLASH 的示例：

// register command table to support more flash chip
spi_flash_register_cmd();
 
QSPI_FLASH_CTX_T spi_flash_handle[FLASH_MAX_INSTANCE];
qspi_configure_t flash_cfg = FLASH4_CONFIG;
struct dma_config flash_dma = FLASH4_DMA_CONFIG;
 
flash_cfg.Instance = FLASH4;
flash_cfg.SpiMode = SPI_MODE_NAND;
flash_cfg.line = 2;
flash_cfg.base = MPI4_MEM_BASE;
 
flash_dma.dma_rcc = FLASH4_DMA_RCC; // 0
flash_dma.Instance = FLASH4_DMA_INSTANCE; //DMA4_Channel1
flash_dma.dma_irq = FLASH4_DMA_IRQ; //DMAC1_CH4_IRQn
flash_dma.request = FLASH4_DMA_REQUEST; //DMA_REQUEST_3
// init QSPI hardware controller 
flash_cfg.SpiMode = 1; // 0 for nor and 1 for nand, 2 for qspi psram, 3 for opi psram, 4 for hpi psram
res = HAL_FLASH_Init(&(spi_flash_handle[3]), &flash_cfg, &spi_flash_dma_handle[1], &flash_dma, BSP_GetFlash2DIV());
if (res != HAL_OK)
    return error;
 
FLASH_HandleTypeDef hflash = &spi_flash_handle[3].handle;
// erase block, for nand, erase is block based 
res = HAL_NAND_ERASE_BLK(hflash, addr);
if (res < 0)
    return error;
 
// write a page 
res = HAL_NAND_WRITE_WITHOOB(hflash, addr, buf, size, NULL, 0);
if (res != size)
    return error;
 
// read data, nand can not use AHB read directly, it should use driver interface
res = HAL_NAND_READ_WITHOOB(hflash, addr, buf, size, NULL, 0);
 
...

以下是 OPI PSRAM 的示例：

QSPI_FLASH_CTX_T spi_flash_handle[FLASH_MAX_INSTANCE];
 
qspi_configure_t flash_cfg;
 
flash_cfg.Instance = FLASH2;
flash_cfg.SpiMode = SPI_MODE_OPSRAM;
flash_cfg.line = 0;
flash_cfg.base = MPI2_MEM_BASE;
flash_cfg.msize = 0x8; 
 
// init MPI hardware controller 
flash_cfg.SpiMode = 3; // 0 for nor and 1 for nand, 2 for qspi psram, 3 for opi psram, 4 for hpi psram
res = HAL_OPI_PSRAM_Init(handle, &qspi_cfg, 1);
HAL_MPI_MR_WRITE(handle, 8, 3);
 
// clk and delay based on PSRAM datasheet
sys_clk = HAL_QSPI_GET_CLK(handle);
sys_clk /= 2;
if (sys_clk <= 66 * 1000000)
    w_lat = 3;
else if (sys_clk <= 109 * 1000000)
    w_lat = 4;
else if (sys_clk <= 133 * 1000000)
    w_lat = 5;
else if (sys_clk <= 166 * 1000000)
    w_lat = 6;
else if (sys_clk <= 200 * 1000000)
    w_lat = 7;
else
    RT_ASSERT(0);
 
if (fix_lat)
    r_lat = w_lat * 2; //10;
else
    r_lat = w_lat; // = 6; //5;
 
/* configure AHB command */
HAL_FLASH_CFG_AHB_RCMD(handle, 7, r_lat - 1, 0, 0, 3, 7, 7);
HAL_FLASH_SET_AHB_RCMD(handle, OPSRAM_RD);
HAL_FLASH_CFG_AHB_WCMD(handle, 7, w_lat - 1, 0, 0, 3, 7, 7);
HAL_FLASH_SET_AHB_WCMD(handle, OPSRAM_WR);
 
HAL_MPI_SET_FIXLAT(handle, fix_lat, r_lat, w_lat);
//-------------------------INIT DONE ---------------------------//
 
int *buf = (int *)MPI2_MEM_BASE;
int i;
 
// Write psram memory
for(i=0; i<1000; i++)
    buf[i] = i*6543;
 
// Read psram
int value = *buf;
 
// Read and Write
int *src = (int *)MPI2_MEM_BASE;
int *dst = (int *)(MPI2_MEM_BASE + 0x100000);
memcpy(dst, src, 1000);
 
...