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From a701d8e1c4c1e31a208dae616ed9067ba4e90191 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Mon, 25 Nov 2013 11:02:51 -0300
Subject: [PATCH 156/203] mtd: nand: pxa3xx: Use extended cmdfunc() only if
needed
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.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
drivers/mtd/nand/pxa3xx_nand.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -900,8 +900,8 @@ static int prepare_set_command(struct px
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;
@@ -948,9 +948,9 @@ static void pxa3xx_nand_cmdfunc(struct m
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;
@@ -1490,6 +1490,21 @@ KEEP_CONFIG:
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,
@@ -1569,11 +1584,7 @@ static int alloc_nand_resource(struct pl
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);
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