COBJS-$(CONFIG_HISFC_FLASH_GODNET) +=
hisfc300new_spi_ids.o
hisfc300new.o
hisfc300new_godnet.o
COBJS-y =
spi_compatible.o
spi_ids.o
- *hifmc_spi_nor_probe* 这个函数很重要
参数类型是 `struct spi_flash`,`struct hisfmc_spi`,`hifmc100_read_ids()`通过给CPU芯片寄存器发一系列命令来获得ids;
然后通过`hisfm_spi_nor_serach_ids(ids)` 查表获得对此flash的一系列操作行为
- `struct spi_flash *spi_nor_flash` `struct spi_nor_info` 这两个才是描述的flash对象和现实中最接近，
里面包含了对flash的名称，大小，读写擦除操作
**spi_flash.h**
```c++
/*spi_flash.h */
struct spi_flash {
struct spi_slave *spi;
const char *name;
u32 size;
int (*read) (struct spi_flash *flash, u32 offset,size_t len,void *buf);
int (*write)(struct spi_flash *flash, u32 offset,size_t len,const void *buf);
int (*erase)(struct spi_flash *flash, u32 offset,size_t len);
}
/* struct hisfc_host */
struct hisfc_host{
struct spi_flash spiflash[1];
void *iobase;
void *regbase;
void *lock;
void *cfgreg;
unsigned int erasesize;
void (*set_system_clock)(struct hisfc_host *host,
struct spi_operation *op,int clk_en);
void (*set_host_addr_mode)(struct hisfc_host *host,int enable)
int num_chip;
struct hisfc_spi spi[CONFIG_HISFC300_CHIP_NUM+1];
};
struct mtd_info_ex {
};
struct spi_info {
char *name;
unsigned char id[8];
unsigened int id_len;
unsigned long chipsize;
unsigend int erasesize;
unsigned int addrcycle;
#define MAX_SPI_OP (8)
struct spi_operation *read[8];
struct spi_operation *write[8];
struct spi_operation *erase[8];
};
struct spi_tag {
char name[16];
unsigned char id[8];
unsigned int id_len;
unsigned long chipsize;
unsigned long erasesize;
unsigned long addrcycle; // 不是特别清楚
#define MAX_SPI_OP_T (8)
struct spi_operation_t read[MAX_SPI_OP_T];
struct spi_operation_t write[MAX_SPI_OP_T];
struct spi_operation_t erase[MAX_SPI_OP_T];
}
struct hisfc_spi {
char *name；
int chipselect;
unsigned long long chipsize;
unsigned int erasesize;
void *iobase;
unsigned int addrcycle;
struct spi_operation read[1];
struct spi_operation write[1];
struct spi_operation erase[MAX_SPI_OP];
void *host;
struct spi_driver *driver;
};
struct spi_driver {
int (*wait_ready)(struct hisfc_spi *spi);
int (*write_enable)(struct hisfc_spi *spi);
int (*entry_4addr)(struct hisfc_spi *spi, int enable);
int (*bus_prepare)(struct hisfc_spi *spi, int op);
int (*qe_enable)(struct hisfc_spi *spi);
};
struct mtd_info_ex{u_char type; /* chip type MTD_NORFLASH / MTD_NANDFLASH */uint64_t chipsize; /* total size of the nand/spi chip */u_int32_t erasesize;u_int32_t pagesize;u_int32_t numchips; /* number of nand chips */u_int32_t oobsize;u_int32_t addrcycle;u_int32_t ecctype;u_char ids[8];u_int32_t id_length;char name[16]; /* chip names */int hostver; /* host controller version */};struct hifmc_host {struct spi_flash spi_nor_flash[1];struct mtd_info_ex *spi_nor_info; // mtd_info_ex主要体现的是flash信息struct hifmc_spi spi[CONFIG_SPI_NOR_MAX_CHIP_NUM];void *regbase;void *iobase;/* This is maybe an un-aligment address, only for malloc or free */char *buforg;char *buffer;unsigned int dma_buffer;void (*set_system_clock)(struct spi_op *op, int clk_en);void (*set_host_addr_mode)(struct hifmc_host *host, int enable);#ifdef CONFIG_CMD_SPI_BLOCK_PROTECTIONunsigned int start_addr;unsigned int end_addr;unsigned char cmp;unsigned char level;#endif};```regbase:SFC_REG_BASE 0x1001_0000spi nor flash 寄存器地址映射空间首地址iobase: SFC_MEM_BASE 0x5800_0000 0x5B00_0000 64MBspi flash 存储空间地址映射地址cfgreg: CRG_REG_BASE CRG 寄存器地址 0x2003_0000关于时钟的<span style="font-family: courier;">##hisfc300_init(void):：</span>hisfc300_init(void):> - struct hisfc_host 对象初始化> - check flash版本寄存器> - hisfc300_probe> - hisfc300_set_system_clock: 确实是设置时钟寄存器PERI_CRG48(24MHz,enable clk,复位禁止)> - 设置0x1001_0110 Timing配置寄存器：片选的setup time,片选的hold time> - hisfc300_spi_probe(host)> - struct spi_flash的方法赋值> - probe_spi_size()spiinfo = spi_serach_ids(hisfc300new_spi_info_table, ids);> 主要：依据id从表格中匹配flash，从而获取此flash的**详细**信息，然后就是结构体赋值spi_info ->spi_tag,这两个结构体基本一致，只是稍有不同
原文链接: https://www.cnblogs.com/xiaoweishine/p/4839353.html
欢迎关注
微信关注下方公众号，第一时间获取干货硬货；公众号内回复【pdf】免费获取数百本计算机经典书籍
原创文章受到原创版权保护。转载请注明出处：https://www.ccppcoding.com/archives/222305
非原创文章文中已经注明原地址，如有侵权，联系删除
关注公众号【高性能架构探索】，第一时间获取最新文章
转载文章受原作者版权保护。转载请注明原作者出处！
