68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
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* nand flash read
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*/
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#define NFCONF (*(volatile unsigned int *)0x4e000000)
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#define rNFCONT (*(volatile unsigned int *)0x4E000004)
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#define NFCMD (*(volatile unsigned int *)0x4e000008)
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#define NFADDR (*(volatile unsigned char *)0x4e00000C)
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#define NFDATA (*(volatile unsigned char *)0x4e000010)
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#define NFSTAT (*(volatile unsigned char *)0x4e000020)
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#define BUSY 1
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#define NAND_SECTOR_SIZE 512
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#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)
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void wait_idle(void) {
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int i;
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while (!(NFSTAT & BUSY)) {
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for(i=0; i<10; i++) {
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;
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}
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}
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}
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/* low level nand read function */
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int nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
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{
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int i, j;
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/*
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* K9F5608UOC asks for 512B per page, and read/write operation must
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* do with page. Therefore, first judge whether start_addr and size
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* are valid.
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*/
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if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
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return -1; /* invalid alignment */
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}
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/* chip Enable */
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NFCONF &= ~0x800;
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for (i=0; i<10; i++) {
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;
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}
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for (i=start_addr; i < (start_addr + size); i+=NAND_SECTOR_SIZE) {
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NFCMD = 0;
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/* Write Address */
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NFADDR = i & 0xff;
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NFADDR = (i >> 9) & 0xff;
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NFADDR = (i >> 17) & 0xff;
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NFADDR = (i >> 25) & 0xff;
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wait_idle();
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for(j=0; j < NAND_SECTOR_SIZE; j++) {
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*buf++ = (NFDATA & 0xff);
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}
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}
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/* chip Disable */
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NFCONF |= 0x800; /* chip disable */
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return 0;
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}
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