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mtd: nand: pxa3xx: Use extended cmdfunc() only if needed

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Currently, we have two different cmdfunc's implementations:
one for PXA3xx SoC variant and one for Armada 370/XP SoC variant.

The former is the legacy one, typically constrained to devices
with page sizes smaller or equal to the controller's FIFO buffer.
On the other side, the latter _only_ supports the so-called extended
command semantics, which allow to handle devices with larger
page sizes (4 KiB, 8 KiB, ...).

This means we currently don't support devices with smaller pages on the
A370/XP SoC. Fix it by first renaming the cmdfuncs variants, and then
make the choice based on device page size (and SoC variant), rather than
SoC variant alone.

While at it, add a check for page size, to make sure we don't allow larger
pages sizes on the PXA3xx variant.

Tested-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Ezequiel Garcia 2013-12-18 18:44:09 -03:00 committed by Brian Norris
parent d20d0a6cf7
commit 5cbbdc6a9f
1 changed files with 21 additions and 10 deletions
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31
drivers/mtd/nand/pxa3xx_nand.c
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@ -897,8 +897,8 @@ static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
return exec_cmd;
}
static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
@ -945,9 +945,9 @@ static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
info->state = STATE_IDLE;
}
static void armada370_nand_cmdfunc(struct mtd_info *mtd,
const unsigned command,
int column, int page_addr)
static void nand_cmdfunc_extended(struct mtd_info *mtd,
const unsigned command,
int column, int page_addr)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
@ -1487,6 +1487,21 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
chip->bbt_md = &bbt_mirror_descr;
}
/*
* If the page size is bigger than the FIFO size, let's check
* we are given the right variant and then switch to the extended
* (aka splitted) command handling,
*/
if (mtd->writesize > PAGE_CHUNK_SIZE) {
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370) {
chip->cmdfunc = nand_cmdfunc_extended;
} else {
dev_err(&info->pdev->dev,
"unsupported page size on this variant\n");
return -ENODEV;
}
}
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370)
ret = armada370_ecc_init(info, &chip->ecc,
chip->ecc_strength_ds,
@ -1566,11 +1581,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
chip->read_buf = pxa3xx_nand_read_buf;
chip->write_buf = pxa3xx_nand_write_buf;
chip->options |= NAND_NO_SUBPAGE_WRITE;
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370)
chip->cmdfunc = armada370_nand_cmdfunc;
else
chip->cmdfunc = pxa3xx_nand_cmdfunc;
chip->cmdfunc = nand_cmdfunc;
}
spin_lock_init(&chip->controller->lock);