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Moved the waiting loop for "Read Data Request" RDDREQ into the

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delta_cmdfunc function, because this bit is only set once after a command
is sent and this allows read functions to be called multiple times.
This commit is contained in:
Markus Klotzbcher 2006-03-02 14:02:36 +01:00 committed by Markus Klotzbcher
parent bb1ff049fb
commit e2053f9c7a
1 changed files with 19 additions and 15 deletions
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34
board/delta/nand.c
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@ -55,13 +55,6 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
{
int i, j;
while(1) {
if(NDSR & NDSR_RDDREQ) {
NDSR |= NDSR_RDDREQ;
break;
}
}
/* we have to be carefull not to overflow the buffer if len is
* not a multiple of 4 */
unsigned long num_words = len & 0xfffffffc;
@ -90,19 +83,25 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
static unsigned long read_buf = 0;
static unsigned char bytes_read = 0;
/* wait for read request */
static void delta_wait_event(unsigned long event)
{
if(!event)
return;
while(1) {
if(NDSR & event) {
NDSR |= event;
break;
}
}
}
static u_char delta_read_byte(struct mtd_info *mtd)
{
/* struct nand_chip *this = mtd->priv; */
unsigned char byte;
if(bytes_read == 0) {
/* wait for read request */
while(1) {
if(NDSR & NDSR_RDDREQ) {
NDSR |= NDSR_RDDREQ;
break;
}
}
read_buf = NDDB;
printk("delta_read_byte: 0x%x.\n", read_buf);
}
@ -119,7 +118,7 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
/* register struct nand_chip *this = mtd->priv; */
unsigned long ndcb0=0, ndcb1=0, ndcb2=0;
unsigned long ndcb0=0, ndcb1=0, ndcb2=0, event=0;
/* clear the ugly byte read buffer */
bytes_read = 0;
@ -153,10 +152,12 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
((page_addr<<8) & 0xff00) |
((page_addr<<8) & 0xff0000) |
((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
event = NDSR_RDDREQ;
break;
case NAND_CMD_READID:
printk("delta_cmdfunc: NAND_CMD_READID.\n");
ndcb0 = (NAND_CMD_READID | (3 << 21) | (1 << 16)); /* addr cycles*/
event = NDSR_RDDREQ;
break;
case NAND_CMD_PAGEPROG:
break;
@ -190,6 +191,9 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
NDCB0 = ndcb0;
NDCB0 = ndcb1;
NDCB0 = ndcb2;
/* wait for event */
delta_wait_event(event);
}
static void delta_dfc_gpio_init()