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mtd: nand: omap_gpmc: Make ready/busy pins configurable 

Commit fb384c4720 introduced the use of
WAIT0 pin for determining whether the NAND is ready or not. This only
works if all NAND chips are connected to WAIT0. If some chips are
connected to the other available pin WAIT1, nand_wait() does not really
wait and prints a WARN_ON message.

This patch allows the board to provide configuration of which chip is
connected to which WAITx signal. For example, one can define in
include/configs/foo.h:

    #define CONFIG_NAND_OMAP_GPMC_WSCFG     0,0,1,1

This would mean that chips using to CS0 and 1 are connected to WAIT0 and
chips with CS2 and 3 are connected to WAIT1.

Signed-off-by: Michal Sojka <sojka@merica.cz>
Acked-by: Stefan Roese <sr@denx.de>
Tested-by: Michal Vokáč <michal.vokac@comap.cz>

Cc: Tom Rini <trini@ti.com>
utp
Michal Sojka 2015-02-17 17:08:37 +01:00 committed by Tom Rini
parent 22b7509efb
commit d8af39337e
1 changed files with 14 additions and 2 deletions
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16
drivers/mtd/nand/omap_gpmc.c
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@ -30,13 +30,22 @@ static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2,
static uint8_t cs_next;
static __maybe_unused struct nand_ecclayout omap_ecclayout;
#if defined(CONFIG_NAND_OMAP_GPMC_WSCFG)
static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE] =
{ CONFIG_NAND_OMAP_GPMC_WSCFG };
#else
/* wscfg is preset to zero since its a static variable */
static const int8_t wscfg[CONFIG_SYS_MAX_NAND_DEVICE];
#endif
/*
* Driver configurations
*/
struct omap_nand_info {
struct bch_control *control;
enum omap_ecc ecc_scheme;
int cs;
uint8_t cs;
uint8_t ws; /* wait status pin (0,1) */
};
/* We are wasting a bit of memory but al least we are safe */
@ -76,7 +85,9 @@ static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd,
/* Check wait pin as dev ready indicator */
static int omap_dev_ready(struct mtd_info *mtd)
{
return gpmc_cfg->status & (1 << 8);
register struct nand_chip *this = mtd->priv;
struct omap_nand_info *info = this->priv;
return gpmc_cfg->status & (1 << (8 + info->ws));
}
/*
@ -962,6 +973,7 @@ int board_nand_init(struct nand_chip *nand)
nand->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd;
omap_nand_info[cs].control = NULL;
omap_nand_info[cs].cs = cs;
omap_nand_info[cs].ws = wscfg[cs];
nand->priv = &omap_nand_info[cs];
nand->cmd_ctrl = omap_nand_hwcontrol;
nand->options |= NAND_NO_PADDING | NAND_CACHEPRG;