124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
#include <generated/csr.h>
|
|
|
|
#include <spiflash.h>
|
|
|
|
#ifdef CSR_SPIFLASH_BASE
|
|
|
|
#define PAGE_PROGRAM_CMD (0x02)
|
|
#define WRDI_CMD (0x04)
|
|
#define RDSR_CMD (0x05)
|
|
#define WREN_CMD (0x06)
|
|
#define SE_CMD (0x20)
|
|
|
|
#define BITBANG_CLK (1 << 1)
|
|
#define BITBANG_CS_N (1 << 2)
|
|
#define BITBANG_DQ_INPUT (1 << 3)
|
|
|
|
#define SR_WIP (1)
|
|
|
|
#define PAGE_SIZE (256)
|
|
#define PAGE_MASK (PAGE_SIZE - 1)
|
|
#define SECTOR_SIZE (4096)
|
|
#define SECTOR_MASK (SECTOR_SIZE - 1)
|
|
|
|
static void flash_write_byte(unsigned char b);
|
|
static void flash_write_addr(unsigned int addr);
|
|
static void wait_for_device_ready(void);
|
|
|
|
#define min(a,b) (a>b?b:a)
|
|
|
|
static void flash_write_byte(unsigned char b)
|
|
{
|
|
int i;
|
|
spiflash_bitbang_write(0); // ~CS_N ~CLK
|
|
|
|
for(i = 0; i < 8; i++, b <<= 1) {
|
|
|
|
spiflash_bitbang_write((b & 0x80) >> 7);
|
|
spiflash_bitbang_write(((b & 0x80) >> 7) | BITBANG_CLK);
|
|
}
|
|
|
|
spiflash_bitbang_write(0); // ~CS_N ~CLK
|
|
|
|
}
|
|
|
|
static void flash_write_addr(unsigned int addr)
|
|
{
|
|
int i;
|
|
spiflash_bitbang_write(0);
|
|
|
|
for(i = 0; i < 24; i++, addr <<= 1) {
|
|
spiflash_bitbang_write((addr & 0x800000) >> 23);
|
|
spiflash_bitbang_write(((addr & 0x800000) >> 23) | BITBANG_CLK);
|
|
}
|
|
|
|
spiflash_bitbang_write(0);
|
|
}
|
|
|
|
static void wait_for_device_ready(void)
|
|
{
|
|
unsigned char sr;
|
|
unsigned char i;
|
|
do {
|
|
sr = 0;
|
|
flash_write_byte(RDSR_CMD);
|
|
spiflash_bitbang_write(BITBANG_DQ_INPUT);
|
|
for(i = 0; i < 8; i++) {
|
|
sr <<= 1;
|
|
spiflash_bitbang_write(BITBANG_CLK | BITBANG_DQ_INPUT);
|
|
sr |= spiflash_miso_read();
|
|
spiflash_bitbang_write(0 | BITBANG_DQ_INPUT);
|
|
}
|
|
spiflash_bitbang_write(0);
|
|
spiflash_bitbang_write(BITBANG_CS_N);
|
|
} while(sr & SR_WIP);
|
|
}
|
|
|
|
void erase_flash_sector(unsigned int addr)
|
|
{
|
|
unsigned int sector_addr = addr & ~(SECTOR_MASK);
|
|
|
|
spiflash_bitbang_en_write(1);
|
|
|
|
wait_for_device_ready();
|
|
|
|
flash_write_byte(WREN_CMD);
|
|
spiflash_bitbang_write(BITBANG_CS_N);
|
|
|
|
flash_write_byte(SE_CMD);
|
|
flash_write_addr(sector_addr);
|
|
spiflash_bitbang_write(BITBANG_CS_N);
|
|
|
|
wait_for_device_ready();
|
|
|
|
spiflash_bitbang_en_write(0);
|
|
}
|
|
|
|
void write_to_flash_page(unsigned int addr, unsigned char *c, unsigned int len)
|
|
{
|
|
unsigned int i;
|
|
|
|
if(len > PAGE_SIZE)
|
|
len = PAGE_SIZE;
|
|
|
|
spiflash_bitbang_en_write(1);
|
|
|
|
wait_for_device_ready();
|
|
|
|
flash_write_byte(WREN_CMD);
|
|
spiflash_bitbang_write(BITBANG_CS_N);
|
|
flash_write_byte(PAGE_PROGRAM_CMD);
|
|
flash_write_addr((unsigned int)addr);
|
|
for(i = 0; i < len; i++)
|
|
flash_write_byte(*c++);
|
|
|
|
spiflash_bitbang_write(BITBANG_CS_N);
|
|
spiflash_bitbang_write(0);
|
|
|
|
wait_for_device_ready();
|
|
|
|
spiflash_bitbang_en_write(0);
|
|
}
|
|
|
|
#endif
|