diff options
| author | Markus Klotzbücher <Markus Klotzbümk@pollux.denx.de> | 2006-03-02 14:02:36 +0100 |
|---|---|---|
| committer | Markus Klotzbücher <mk@pollux.denx.de> | 2006-03-02 14:02:36 +0100 |
| commit | e2053f9c7a00ccce4ded50634e8b52138f6e88bc (patch) | |
| tree | 332b806d81e8819b9c4efdba5834abdece23c6d1 | |
| parent | bb1ff049fbac1a4edf8f0655071383e3837d337e (diff) | |
| download | u-boot-imx-e2053f9c7a00ccce4ded50634e8b52138f6e88bc.zip u-boot-imx-e2053f9c7a00ccce4ded50634e8b52138f6e88bc.tar.gz u-boot-imx-e2053f9c7a00ccce4ded50634e8b52138f6e88bc.tar.bz2 | |
Moved the waiting loop for "Read Data Request" RDDREQ into the
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.
| -rw-r--r-- | board/delta/nand.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/board/delta/nand.c b/board/delta/nand.c index 50d2ec2..da6430d 100644 --- a/board/delta/nand.c +++ b/board/delta/nand.c @@ -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() |