Implemented writing, not working yet.
This commit is contained in:
Markus Klotzb�cher
Markus Klotzb�cher
parent
e2053f9c7a
commit
19fdeff433
board/delta
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@ -46,6 +46,48 @@ static int delta_device_ready(struct mtd_info *mtdinfo)
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return 0;
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}
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/*
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* Write buf to the DFC Controller Data Buffer
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*/
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static void delta_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
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{
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unsigned long bytes_multi = len & 0xfffffffc;
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unsigned long rest = len & 0x3;
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unsigned long *long_buf;
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int i;
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if(bytes_multi) {
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for(i=0; i<bytes_multi; i+=4) {
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long_buf = (unsigned long*) &buf[i];
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NDDB = *long_buf;
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}
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}
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if(rest) {
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printf("delta_write_buf: ERROR, writing non 4-byte aligned data.\n");
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}
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return;
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}
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/*
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* These functions are quite problematic for the DFC. Luckily they are
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* not used in the current nand code, except for nand_command, which
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* we've defined our own anyway. The problem is, that we always need
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* to write 4 bytes to the DFC Data Buffer, but in these functions we
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* don't know if to buffer the bytes/half words until we've gathered 4
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* bytes or if to send them straight away.
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*
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* Solution: Don't use these with Mona's DFC and complain loudly.
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*/
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static void delta_write_word(struct mtd_info *mtd, u16 word)
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{
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printf("delta_write_word: WARNING, this function does not work with the Monahans DFC!\n");
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}
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static void delta_write_byte(struct mtd_info *mtd, u_char byte)
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{
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printf("delta_write_byte: WARNING, this function does not work with the Monahans DFC!\n");
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}
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/* The original:
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* static void delta_read_buf(struct mtd_info *mtd, const u_char *buf, int len)
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*
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@ -57,14 +99,14 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
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/* we have to be carefull not to overflow the buffer if len is
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* not a multiple of 4 */
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unsigned long num_words = len & 0xfffffffc;
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unsigned long bytes_multi = len & 0xfffffffc;
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unsigned long rest = len & 0x3;
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unsigned long *long_buf;
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/* if there are any, first copy multiple of 4 bytes */
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if(num_words) {
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for(i=0; i<num_words; i+=4) {
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unsigned long *long_buf = &buf[i];
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/* ((unsigned long *) &buf[i]) = NDDB; */
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if(bytes_multi) {
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for(i=0; i<bytes_multi; i+=4) {
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long_buf = (unsigned long*) &buf[i];
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*long_buf = NDDB;
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}
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}
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@ -72,30 +114,22 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
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/* ...then the rest */
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if(rest) {
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unsigned long rest_data = NDDB;
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for(j=0;j<rest;j++)
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for(j=0;j<rest; j++)
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buf[i+j] = (u_char) ((rest_data>>j) & 0xff);
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}
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return;
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}
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/* global var, too bad */
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static void delta_read_word(struct mtd_info *mtd, u_char byte)
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{
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printf("delta_write_byte: UNIMPLEMENTED.\n");
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}
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/* global var, too bad: mk@tbd: move to ->priv pointer */
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static unsigned long read_buf = 0;
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static unsigned char bytes_read = 0;
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/* wait for read request */
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static void delta_wait_event(unsigned long event)
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{
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if(!event)
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return;
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while(1) {
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if(NDSR & event) {
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NDSR |= event;
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break;
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}
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}
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}
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static u_char delta_read_byte(struct mtd_info *mtd)
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{
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/* struct nand_chip *this = mtd->priv; */
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@ -113,16 +147,50 @@ static u_char delta_read_byte(struct mtd_info *mtd)
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return byte;
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}
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/* delay function */
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static void wait(unsigned long us)
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{
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#define OSCR_CLK_FREQ 3.250 /* kHz */
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unsigned long start = OSCR;
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unsigned long delta = 0, cur;
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us *= OSCR_CLK_FREQ;
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while (delta < us) {
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cur = OSCR;
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if(cur < start) /* OSCR overflowed */
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delta = cur + (start^0xffffffff);
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else
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delta = cur - start;
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}
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}
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/* poll the NAND Controller Status Register for event */
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static void delta_wait_event(unsigned long event)
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{
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if(!event)
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return;
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while(1) {
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if(NDSR & event) {
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NDSR |= event;
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break;
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}
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}
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}
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/* this is really monahans, not board specific ... */
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static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
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int column, int page_addr)
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{
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/* register struct nand_chip *this = mtd->priv; */
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unsigned long ndcb0=0, ndcb1=0, ndcb2=0, event=0;
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unsigned long what_the_hack;
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/* clear the ugly byte read buffer */
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bytes_read = 0;
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read_buf = 0;
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/* Clear NDSR */
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NDSR = 0xFFF;
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@ -160,29 +228,76 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
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event = NDSR_RDDREQ;
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break;
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case NAND_CMD_PAGEPROG:
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printk("delta_cmdfunc: NAND_CMD_PAGEPROG.\n");
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ndcb0 = (NAND_CMD_PAGEPROG | (1 << 21));
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break;
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case NAND_CMD_ERASE1:
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case NAND_CMD_ERASE2:
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printf("delta_cmdfunc: NAND_CMD_ERASEx unimplemented.\n");
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break;
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case NAND_CMD_SEQIN:
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ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<19) | (4<<16);
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if(column >= mtd->oobblock) {
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/* OOB area */
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column -= mtd->oobblock;
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ndcb0 |= NAND_CMD_READOOB;
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} else if (column < 256) {
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/* First 256 bytes --> READ0 */
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ndcb0 |= NAND_CMD_READ0;
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} else {
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/* Only for 8 bit devices - not delta!!! */
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column -= 256;
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ndcb0 |= NAND_CMD_READ1;
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}
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/* send PAGE_PROG command(0x80) */
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printf("delta_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG.\n");
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ndcb0 = (NAND_CMD_SEQIN | (1<<21) | (3<<16));
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column >>= 1; /* adjust for 16 bit bus */
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ndcb1 = (((column>>1) & 0xff) |
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((page_addr<<8) & 0xff00) |
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((page_addr<<8) & 0xff0000) |
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((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
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event = NDSR_WRDREQ;
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break;
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/* case NAND_CMD_SEQIN_pointer_operation: */
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/* /\* This is confusing because the command names are */
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/* * different compared to the ones in the K9K12Q0C */
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/* * datasheet. Infact this has nothing to do with */
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/* * reading, as the but with page programming */
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/* * (writing). */
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/* * Here we send the multibyte commands */
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/* * cmd1=0x00, cmd2=0x80 (for programming main area) or */
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/* * cmd1=0x50, cmd2=0x80 (for spare area) */
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/* * */
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/* * When all data is written to the buffer, the page */
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/* * program command (0x10) is sent to actually write */
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/* * the data. */
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/* *\/ */
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/* printf("delta_cmdfunc: NAND_CMD_SEQIN pointer op called.\n"); */
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/* ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<21) | (1<<19) | (4<<16); */
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/* if(column >= mtd->oobblock) { */
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/* /\* OOB area *\/ */
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/* column -= mtd->oobblock; */
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/* ndcb0 |= NAND_CMD_READOOB; */
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/* } else if (column < 256) { */
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/* /\* First 256 bytes --> READ0 *\/ */
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/* ndcb0 |= NAND_CMD_READ0; */
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/* } else { */
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/* /\* Only for 8 bit devices - not delta!!! *\/ */
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/* column -= 256; */
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/* ndcb0 |= NAND_CMD_READ1; */
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/* } */
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/* event = NDSR_WRDREQ; */
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/* break; */
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case NAND_CMD_STATUS:
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return;
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/* oh, this is not nice. for some reason the real
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* status byte is in the second read from the data
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* buffer. The hack is to read the first byte right
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* here, so the next read access by the nand code
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* yields the right one.
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*/
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ndcb0 = (NAND_CMD_STATUS | (4<<21));
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event = NDSR_RDDREQ;
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NDCB0 = ndcb0;
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NDCB0 = ndcb1;
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NDCB0 = ndcb2;
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delta_wait_event(event);
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what_the_hack = NDDB;
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goto end;
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break;
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case NAND_CMD_RESET:
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return;
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printf("delta_cmdfunc: NAND_CMD_RESET unimplemented.\n");
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break;
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default:
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printk("delta_cmdfunc: error, unsupported command.\n");
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return;
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@ -194,6 +309,8 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
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/* wait for event */
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delta_wait_event(event);
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end:
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return;
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}
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static void delta_dfc_gpio_init()
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@ -251,23 +368,6 @@ static void delta_dfc_gpio_init()
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* Members with a "?" were not set in the merged testing-NAND branch,
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* so they are not set here either.
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*/
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void wait(unsigned long us)
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{
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#define OSCR_CLK_FREQ 3.250 /* kHz */
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unsigned long start = OSCR;
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unsigned long delta = 0, cur;
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us *= OSCR_CLK_FREQ;
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while (delta < us) {
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cur = OSCR;
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if(cur < start) /* OSCR overflowed */
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delta = cur + (start^0xffffffff);
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else
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delta = cur - start;
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}
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}
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void board_nand_init(struct nand_chip *nand)
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{
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unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR;
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@ -402,13 +502,17 @@ void board_nand_init(struct nand_chip *nand)
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nand->eccmode = NAND_ECC_SOFT;
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nand->chip_delay = NAND_DELAY_US;
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nand->options = NAND_BUSWIDTH_16;
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nand->read_byte = delta_read_byte;
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nand->write_byte = delta_write_byte;
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nand->read_word = delta_read_word;
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nand->write_word = delta_write_word;
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nand->read_buf = delta_read_buf;
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nand->write_buf = delta_write_buf;
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nand->cmdfunc = delta_cmdfunc;
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/* nand->options = NAND_SAMSUNG_LP_OPTIONS; */
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}
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#else
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#error "U-Boot legacy NAND support not available for delta board."
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#error "U-Boot legacy NAND support not available for delta board."
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#endif
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#endif
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