142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
#include <generated/csr.h>
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#if (defined CSR_SPIFLASH_BASE && defined SPIFLASH_PAGE_SIZE)
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#include <spiflash.h>
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#define PAGE_PROGRAM_CMD 0x02
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#define WRDI_CMD 0x04
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#define RDSR_CMD 0x05
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#define WREN_CMD 0x06
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#define SE_CMD 0xd8
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#define BITBANG_CLK (1 << 1)
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#define BITBANG_CS_N (1 << 2)
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#define BITBANG_DQ_INPUT (1 << 3)
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#define SR_WIP 1
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static void flash_write_byte(unsigned char b);
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static void flash_write_addr(unsigned int addr);
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static void wait_for_device_ready(void);
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#define min(a,b) (a>b?b:a)
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static void flash_write_byte(unsigned char b)
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{
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int i;
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spiflash_bitbang_write(0); // ~CS_N ~CLK
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for(i = 0; i < 8; i++, b <<= 1) {
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spiflash_bitbang_write((b & 0x80) >> 7);
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spiflash_bitbang_write(((b & 0x80) >> 7) | BITBANG_CLK);
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}
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spiflash_bitbang_write(0); // ~CS_N ~CLK
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}
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static void flash_write_addr(unsigned int addr)
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{
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int i;
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spiflash_bitbang_write(0);
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for(i = 0; i < 24; i++, addr <<= 1) {
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spiflash_bitbang_write((addr & 0x800000) >> 23);
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spiflash_bitbang_write(((addr & 0x800000) >> 23) | BITBANG_CLK);
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}
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spiflash_bitbang_write(0);
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}
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static void wait_for_device_ready(void)
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{
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unsigned char sr;
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unsigned char i;
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do {
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sr = 0;
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flash_write_byte(RDSR_CMD);
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spiflash_bitbang_write(BITBANG_DQ_INPUT);
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for(i = 0; i < 8; i++) {
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sr <<= 1;
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spiflash_bitbang_write(BITBANG_CLK | BITBANG_DQ_INPUT);
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sr |= spiflash_miso_read();
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spiflash_bitbang_write(0 | BITBANG_DQ_INPUT);
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}
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spiflash_bitbang_write(0);
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spiflash_bitbang_write(BITBANG_CS_N);
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} while(sr & SR_WIP);
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}
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void erase_flash_sector(unsigned int addr)
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{
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unsigned int sector_addr = addr & ~(SPIFLASH_SECTOR_SIZE - 1);
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spiflash_bitbang_en_write(1);
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wait_for_device_ready();
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flash_write_byte(WREN_CMD);
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spiflash_bitbang_write(BITBANG_CS_N);
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flash_write_byte(SE_CMD);
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flash_write_addr(sector_addr);
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spiflash_bitbang_write(BITBANG_CS_N);
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wait_for_device_ready();
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spiflash_bitbang_en_write(0);
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}
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void write_to_flash_page(unsigned int addr, const unsigned char *c, unsigned int len)
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{
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unsigned int i;
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if(len > SPIFLASH_PAGE_SIZE)
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len = SPIFLASH_PAGE_SIZE;
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spiflash_bitbang_en_write(1);
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wait_for_device_ready();
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flash_write_byte(WREN_CMD);
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spiflash_bitbang_write(BITBANG_CS_N);
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flash_write_byte(PAGE_PROGRAM_CMD);
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flash_write_addr((unsigned int)addr);
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for(i = 0; i < len; i++)
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flash_write_byte(*c++);
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spiflash_bitbang_write(BITBANG_CS_N);
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spiflash_bitbang_write(0);
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wait_for_device_ready();
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spiflash_bitbang_en_write(0);
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}
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#define SPIFLASH_PAGE_MASK (SPIFLASH_PAGE_SIZE - 1)
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void write_to_flash(unsigned int addr, const unsigned char *c, unsigned int len)
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{
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unsigned int written = 0;
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if(addr & SPIFLASH_PAGE_MASK) {
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written = min(SPIFLASH_PAGE_SIZE - (addr & SPIFLASH_PAGE_MASK), len);
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write_to_flash_page(addr, c, written);
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c += written;
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addr += written;
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len -= written;
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}
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while(len > 0) {
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written = min(len, SPIFLASH_PAGE_SIZE);
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write_to_flash_page(addr, c, written);
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c += written;
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addr += written;
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len -= written;
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}
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}
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#endif /* CSR_SPIFLASH_BASE && SPIFLASH_PAGE_SIZE */
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