diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0156-mtd-nand-pxa3xx-Use-extended-cmdfunc-only-if-needed.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0156-mtd-nand-pxa3xx-Use-extended-cmdfunc-only-if-needed.patch | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0156-mtd-nand-pxa3xx-Use-extended-cmdfunc-only-if-needed.patch b/target/linux/mvebu/patches-3.10/0156-mtd-nand-pxa3xx-Use-extended-cmdfunc-only-if-needed.patch new file mode 100644 index 0000000000..7b14da8cea --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0156-mtd-nand-pxa3xx-Use-extended-cmdfunc-only-if-needed.patch @@ -0,0 +1,89 @@ +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); |