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sf: unify status polling for ready bit

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All of the spi flash drivers implement the status register polling for
detecting the device ready state, so unify them all in a new helper
function -- spi_flash_wait_ready.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
2011-01-10 02:20:12 -05:00
committed by Wolfgang Denk
parent 000044d8bf
commit 6163045bcd
9 changed files with 81 additions and 283 deletions
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41
drivers/mtd/spi/spi_flash.c
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@@ -69,6 +69,47 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
return ret;
}
int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
u8 cmd, u8 poll_bit)
{
struct spi_slave *spi = flash->spi;
unsigned long timebase;
int ret;
u8 status;
ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
if (ret) {
debug("SF: Failed to send command %02x: %d\n", cmd, ret);
return ret;
}
timebase = get_timer(0);
do {
ret = spi_xfer(spi, 8, NULL, &status, 0);
if (ret)
return -1;
if ((status & poll_bit) == 0)
break;
} while (get_timer(timebase) < timeout);
spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
if ((status & poll_bit) == 0)
return 0;
/* Timed out */
debug("SF: time out!\n");
return -1;
}
int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
return spi_flash_cmd_poll_bit(flash, timeout,
CMD_READ_STATUS, STATUS_WIP);
}
/*
* The following table holds all device probe functions
*