From: pekon gupta Date: Mon, 5 May 2014 19:16:19 +0000 (+0530) Subject: mtd: nand: omap: add CONFIG_SYS_NAND_BUSWIDTH_16BIT to indicate NAND device bus-width X-Git-Url: http://git.dujemihanovic.xyz/%22/img/sics.gif/%22/static/git-favicon.png?a=commitdiff_plain;h=b80a66033856cc89c62886ae3e5ba54a7faf31ae;p=u-boot.git mtd: nand: omap: add CONFIG_SYS_NAND_BUSWIDTH_16BIT to indicate NAND device bus-width GPMC controller needs to be configured based on bus-width of the NAND device connected to it. Also, dynamic detection of NAND bus-width from on-chip ONFI parameters is not possible in following situations: SPL: SPL NAND drivers does not support ONFI parameter reading. U-boot: GPMC controller iniitalization is done in omap_gpmc.c:board_nand_init() which is called before probing for devices, hence any ONFI parameter information is not available during GPMC initialization. Thus, OMAP NAND driver expected board developers to explicitely write GPMC configurations specific to NAND device attached on board in board files itself. But this was troublesome for board manufacturers as they need to dive into lengthy platform & SoC documents to find details of GPMC registers and appropriate configurations to get NAND device working. This patch instead adds existing CONFIG_SYS_NAND_BUSWIDTH_16BIT to board config hich indicates that connected NAND device has x16 bus-width. And then based on this config GPMC driver itself initializes itself based on NAND bus-width. This keeps board developers free from knowing GPMC controller specific internals. Signed-off-by: Pekon Gupta --- diff --git a/doc/README.nand b/doc/README.nand index b91f1985d1..2bc5b391f8 100644 --- a/doc/README.nand +++ b/doc/README.nand @@ -190,6 +190,24 @@ Configuration Options: This is used by SoC platforms which do not have built-in ELM hardware engine required for BCH ECC correction. + CONFIG_SYS_NAND_BUSWIDTH_16BIT + Indicates that NAND device has 16-bit wide data-bus. In absence of this + config, bus-width of NAND device is assumed to be either 8-bit and later + determined by reading ONFI params. + Above config is useful when NAND device's bus-width information cannot + be determined from on-chip ONFI params, like in following scenarios: + - SPL boot does not support reading of ONFI parameters. This is done to + keep SPL code foot-print small. + - In current U-Boot flow using nand_init(), driver initialization + happens in board_nand_init() which is called before any device probe + (nand_scan_ident + nand_scan_tail), thus device's ONFI parameters are + not available while configuring controller. So a static CONFIG_NAND_xx + is needed to know the device's bus-width in advance. + Some drivers using above config are: + drivers/mtd/nand/mxc_nand.c + drivers/mtd/nand/ndfc.c + drivers/mtd/nand/omap_gpmc.c + Platform specific options ========================= diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index d2fedf9fac..cdfa6bc1c9 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -782,13 +782,18 @@ int board_nand_init(struct nand_chip *nand) nand->priv = &omap_nand_info; nand->cmd_ctrl = omap_nand_hwcontrol; nand->options |= NAND_NO_PADDING | NAND_CACHEPRG; - /* If we are 16 bit dev, our gpmc config tells us that */ - if ((readl(&gpmc_cfg->cs[cs].config1) & 0x3000) == 0x1000) - nand->options |= NAND_BUSWIDTH_16; - nand->chip_delay = 100; nand->ecc.layout = &omap_ecclayout; + /* configure driver and controller based on NAND device bus-width */ + gpmc_config = readl(&gpmc_cfg->cs[cs].config1); +#if defined(CONFIG_SYS_NAND_BUSWIDTH_16BIT) + nand->options |= NAND_BUSWIDTH_16; + writel(gpmc_config | (0x1 << 12), &gpmc_cfg->cs[cs].config1); +#else + nand->options &= ~NAND_BUSWIDTH_16; + writel(gpmc_config & ~(0x1 << 12), &gpmc_cfg->cs[cs].config1); +#endif /* select ECC scheme */ #if defined(CONFIG_NAND_OMAP_ECCSCHEME) err = omap_select_ecc_scheme(nand, CONFIG_NAND_OMAP_ECCSCHEME, diff --git a/include/configs/am3517_crane.h b/include/configs/am3517_crane.h index 4407b454dd..ad4cbd88b8 100644 --- a/include/configs/am3517_crane.h +++ b/include/configs/am3517_crane.h @@ -329,6 +329,7 @@ #define CONFIG_SPL_LDSCRIPT "$(CPUDIR)/omap-common/u-boot-spl.lds" /* NAND boot config */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_5_ADDR_CYCLE #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 diff --git a/include/configs/devkit8000.h b/include/configs/devkit8000.h index 16a00ebe86..5308790fe6 100644 --- a/include/configs/devkit8000.h +++ b/include/configs/devkit8000.h @@ -314,6 +314,7 @@ #define CONFIG_SPL_BSS_MAX_SIZE 0x80000 /* NAND boot config */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_5_ADDR_CYCLE #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 diff --git a/include/configs/dig297.h b/include/configs/dig297.h index af6f56bb34..ce205e9b3e 100644 --- a/include/configs/dig297.h +++ b/include/configs/dig297.h @@ -138,6 +138,7 @@ * Board NAND Info. */ #define CONFIG_NAND_OMAP_GPMC +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_ADDR NAND_BASE /* physical address */ /* to access nand */ #define CONFIG_SYS_NAND_BASE NAND_BASE /* physical address */ diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h index 0a7df60f28..c02348354a 100644 --- a/include/configs/omap3_beagle.h +++ b/include/configs/omap3_beagle.h @@ -295,6 +295,7 @@ #define CONFIG_SPL_OMAP3_ID_NAND /* NAND boot config */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_5_ADDR_CYCLE #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 diff --git a/include/configs/omap3_evm_common.h b/include/configs/omap3_evm_common.h index 7f3424b4f0..ae4ce63f67 100644 --- a/include/configs/omap3_evm_common.h +++ b/include/configs/omap3_evm_common.h @@ -120,7 +120,7 @@ /* Max number of NAND devices */ #define CONFIG_SYS_MAX_NAND_DEVICE 1 - +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 /* Timeout values (in ticks) */ #define CONFIG_SYS_FLASH_ERASE_TOUT (100 * CONFIG_SYS_HZ) #define CONFIG_SYS_FLASH_WRITE_TOUT (100 * CONFIG_SYS_HZ) diff --git a/include/configs/omap3_igep00x0.h b/include/configs/omap3_igep00x0.h index d56d5b00cc..79daabd6bb 100644 --- a/include/configs/omap3_igep00x0.h +++ b/include/configs/omap3_igep00x0.h @@ -187,6 +187,7 @@ /* NAND boot config */ #ifdef CONFIG_NAND +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_5_ADDR_CYCLE #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 diff --git a/include/configs/omap3_logic.h b/include/configs/omap3_logic.h index 0d03c75ce3..8dcbba3c40 100644 --- a/include/configs/omap3_logic.h +++ b/include/configs/omap3_logic.h @@ -141,6 +141,7 @@ #define CONFIG_SYS_MAX_NAND_DEVICE 1 /* Max number of */ /* NAND devices */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_JFFS2_NAND /* nand device jffs2 lives on */ #define CONFIG_JFFS2_DEV "nand0" diff --git a/include/configs/omap3_overo.h b/include/configs/omap3_overo.h index 7b97be9ace..1a13633949 100644 --- a/include/configs/omap3_overo.h +++ b/include/configs/omap3_overo.h @@ -206,6 +206,7 @@ #define CONFIG_SYS_CACHELINE_SIZE 64 /* NAND boot config */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_5_ADDR_CYCLE #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 diff --git a/include/configs/omap3_zoom1.h b/include/configs/omap3_zoom1.h index 7c5540ff66..3efe4cf815 100644 --- a/include/configs/omap3_zoom1.h +++ b/include/configs/omap3_zoom1.h @@ -98,6 +98,7 @@ #define CONFIG_SYS_NAND_BASE NAND_BASE /* physical address */ /* to access nand at */ /* CS0 */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 /* Environment information */ diff --git a/include/configs/tam3517-common.h b/include/configs/tam3517-common.h index 3522c1a07a..eda536b866 100644 --- a/include/configs/tam3517-common.h +++ b/include/configs/tam3517-common.h @@ -249,6 +249,7 @@ #define CONFIG_SPL_BSS_MAX_SIZE 0x80000 /* NAND boot config */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 #define CONFIG_SYS_NAND_PAGE_COUNT 64 #define CONFIG_SYS_NAND_PAGE_SIZE 2048 #define CONFIG_SYS_NAND_OOBSIZE 64 diff --git a/include/configs/tao3530.h b/include/configs/tao3530.h index 9c04c23ab7..4471935287 100644 --- a/include/configs/tao3530.h +++ b/include/configs/tao3530.h @@ -141,6 +141,7 @@ #define CONFIG_SYS_MAX_NAND_DEVICE 1 /* Max number of NAND */ /* devices */ +#define CONFIG_SYS_NAND_BUSWIDTH_16BIT 16 /* Environment information */ #define CONFIG_BOOTDELAY 3