mxc_nand: Allow flash based bbt (f1372055) · Commits · e / devices / android_kernel_oneplus_sm8150

arch/arm/plat-mxc/include/mach/mxc_nand.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@

		struct mxc_nand_platform_data {
		int width; /* data bus width in bytes */
		int hw_ecc; /* 0 if supress hardware ECC */
		int hw_ecc:1; /* 0 if supress hardware ECC */
		int flash_bbt:1; /* set to 1 to use a flash based bbt */
		};
		#endif /* __ASM_ARCH_NAND_H */

+34 −0

Original line number	Diff line number	Diff line
		@@ -648,6 +648,33 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
		}
		}

		/*
		* The generic flash bbt decriptors overlap with our ecc
		* hardware, so define some i.MX specific ones.
		*/
		static uint8_t bbt_pattern[] = { 'B', 'b', 't', '0' };
		static uint8_t mirror_pattern[] = { '1', 't', 'b', 'B' };

		static struct nand_bbt_descr bbt_main_descr = {
		.options = NAND_BBT_LASTBLOCK \| NAND_BBT_CREATE \| NAND_BBT_WRITE
		\| NAND_BBT_2BIT \| NAND_BBT_VERSION \| NAND_BBT_PERCHIP,
		.offs = 0,
		.len = 4,
		.veroffs = 4,
		.maxblocks = 4,
		.pattern = bbt_pattern,
		};

		static struct nand_bbt_descr bbt_mirror_descr = {
		.options = NAND_BBT_LASTBLOCK \| NAND_BBT_CREATE \| NAND_BBT_WRITE
		\| NAND_BBT_2BIT \| NAND_BBT_VERSION \| NAND_BBT_PERCHIP,
		.offs = 0,
		.len = 4,
		.veroffs = 4,
		.maxblocks = 4,
		.pattern = mirror_pattern,
		};

		static int __init mxcnd_probe(struct platform_device *pdev)
		{
		struct nand_chip *this;
		@@ -786,6 +813,13 @@ static int __init mxcnd_probe(struct platform_device *pdev)
		if (pdata->width == 2)
		this->options \|= NAND_BUSWIDTH_16;

		if (pdata->flash_bbt) {
		this->bbt_td = &bbt_main_descr;
		this->bbt_md = &bbt_mirror_descr;
		/* update flash based bbt */
		this->options \|= NAND_USE_FLASH_BBT;
		}

		/* first scan to find the device and get the page size */
		if (nand_scan_ident(mtd, 1)) {
		err = -ENXIO;