From 3f2e924b26989bbe1ad600a83fdc72a3056104d1 Mon Sep 17 00:00:00 2001 From: Bastian Hecht Date: Thu, 1 Mar 2012 10:48:40 +0100 Subject: [PATCH] mtd: sh_flctl: Add FLHOLDCR register Add a register used in new FLCTL hardware and a feature flag for it. Signed-off-by: Bastian Hecht Acked-by: Laurent Pinchart Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/nand/sh_flctl.c | 3 +++ include/linux/mtd/sh_flctl.h | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c index 48d5da0ec758..d0f1f3c13e76 100644 --- a/drivers/mtd/nand/sh_flctl.c +++ b/drivers/mtd/nand/sh_flctl.c @@ -693,6 +693,8 @@ static void flctl_select_chip(struct mtd_info *mtd, int chipnr) case 0: flctl->flcmncr_base |= CE0_ENABLE; writel(flctl->flcmncr_base, FLCMNCR(flctl)); + if (flctl->holden) + writel(HOLDEN, FLHOLDCR(flctl)); break; default: BUG(); @@ -849,6 +851,7 @@ static int __devinit flctl_probe(struct platform_device *pdev) flctl->pdev = pdev; flctl->flcmncr_base = pdata->flcmncr_val; flctl->hwecc = pdata->has_hwecc; + flctl->holden = pdata->use_holden; nand->options = NAND_NO_AUTOINCR; diff --git a/include/linux/mtd/sh_flctl.h b/include/linux/mtd/sh_flctl.h index c7082820703b..8bcf299cb9bf 100644 --- a/include/linux/mtd/sh_flctl.h +++ b/include/linux/mtd/sh_flctl.h @@ -38,6 +38,7 @@ #define FLDTFIFO(f) (f->reg + 0x24) #define FLECFIFO(f) (f->reg + 0x28) #define FLTRCR(f) (f->reg + 0x2C) +#define FLHOLDCR(f) (f->reg + 0x38) #define FL4ECCRESULT0(f) (f->reg + 0x80) #define FL4ECCRESULT1(f) (f->reg + 0x84) #define FL4ECCRESULT2(f) (f->reg + 0x88) @@ -109,6 +110,15 @@ #define TRSTRT (0x1 << 0) /* translation start */ #define TREND (0x1 << 1) /* translation end */ +/* + * FLHOLDCR control bits + * + * HOLDEN: Bus Occupancy Enable (inverted) + * Enable this bit when the external bus might be used in between transfers. + * If not set and the bus gets used by other modules, a deadlock occurs. + */ +#define HOLDEN (0x1 << 0) + /* FL4ECCCR control bits */ #define _4ECCFA (0x1 << 2) /* 4 symbols correct fault */ #define _4ECCEND (0x1 << 1) /* 4 symbols end */ @@ -138,6 +148,7 @@ struct sh_flctl { unsigned page_size:1; /* NAND page size (0 = 512, 1 = 2048) */ unsigned hwecc:1; /* Hardware ECC (0 = disabled, 1 = enabled) */ + unsigned holden:1; /* Hardware has FLHOLDCR and HOLDEN is set */ }; struct sh_flctl_platform_data { @@ -146,6 +157,7 @@ struct sh_flctl_platform_data { unsigned long flcmncr_val; unsigned has_hwecc:1; + unsigned use_holden:1; }; static inline struct sh_flctl *mtd_to_flctl(struct mtd_info *mtdinfo) -- 2.30.2