David Brownell <[email protected]> wrote:
>
> Here's a driver for more traditional types of SPI flash, as found
> in the ST M25 series. Contributed by Mike Lavender (thanks Mike!)
> and tested on some ColdFire boards.
>
bah, attachments..
> This was originally a driver for the ST M25P80 SPI flash. It's been
> updated slightly to handle other M25P series chips.
>
> For many of these chips, the specific type could be probed, but for now
> this just requires static setup with flash_platform_data that lists the
> chip type (size, format) and any default partitioning to use.
>
> From: Mike Lavender <[email protected]>
> Signed-off-by: David Brownell <[email protected]>
>
Please put the From: at the very first line of the changelog.
Mike, please review section 11 of Documentation/SubmittingPatches and send
a Signed-off-by: for this work, thanks.
> +static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
> + size_t *retlen, const u_char *buf)
> +{
> + struct m25p *flash = mtd_to_m25p(mtd);
> + u32 page_offset, page_size;
> + struct spi_transfer t[2];
> + struct spi_message m;
> +
> + DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %z\n", spi->dev.bus_id,
> + __FUNCTION__, "to", (u32) to, len);
> +
> + if (retlen)
> + *retlen = 0;
If retlen can be NULL
> + /* sanity checks */
> + if (!len)
> + return(0);
> +
> + if (to + len > flash->mtd.size)
> + return -EINVAL;
> +
> + down(&flash->lock);
> +
> + /* Wait until finished previous write command. */
> + if (wait_till_ready(flash))
> + return 1;
> +
> + write_enable(flash);
> +
> + memset(t, 0, (sizeof t));
> +
> + /* Set up the opcode in the write buffer. */
> + flash->command[0] = OPCODE_PP;
> + flash->command[1] = to >> 16;
> + flash->command[2] = to >> 8;
> + flash->command[3] = to;
> +
> + t[0].tx_buf = flash->command;
> + t[0].len = sizeof(flash->command);
> +
> + m.transfers = t;
> + m.n_transfer = 2;
> +
> + /* what page do we start with? */
> + page_offset = to % FLASH_PAGESIZE;
> +
> + /* do all the bytes fit onto one page? */
> + if (page_offset + len <= FLASH_PAGESIZE) {
> + t[1].tx_buf = buf;
> + t[1].len = len;
> +
> + spi_sync(flash->spi, &m);
> +
> + *retlen = m.actual_length - sizeof(flash->command);
this will oops.
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