From efc3e6f5d29f87a433b42f15a0b87e04b7cd498d Mon Sep 17 00:00:00 2001 From: Weijie Gao Date: Wed, 3 Mar 2021 10:11:32 +0800 Subject: [PATCH 38/71] env: add support for generic MTD device Add an env driver for generic MTD device. Signed-off-by: Weijie Gao --- cmd/nvedit.c | 3 +- env/Kconfig | 37 +++++- env/Makefile | 1 + env/env.c | 3 + env/mtd.c | 256 +++++++++++++++++++++++++++++++++++++++++ include/env_internal.h | 1 + tools/Makefile | 1 + 7 files changed, 299 insertions(+), 3 deletions(-) create mode 100644 env/mtd.c --- a/env/Kconfig +++ b/env/Kconfig @@ -61,7 +61,7 @@ config ENV_IS_DEFAULT !ENV_IS_IN_MMC && !ENV_IS_IN_NAND && \ !ENV_IS_IN_NVRAM && !ENV_IS_IN_ONENAND && \ !ENV_IS_IN_REMOTE && !ENV_IS_IN_SPI_FLASH && \ - !ENV_IS_IN_UBI + !ENV_IS_IN_UBI && !ENV_IS_IN_MTD select ENV_IS_NOWHERE config ENV_IS_NOWHERE @@ -254,6 +254,27 @@ config ENV_IS_IN_MMC offset: "u-boot,mmc-env-offset", "u-boot,mmc-env-offset-redundant". CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND are not used. +config ENV_IS_IN_MTD + bool "Environment in a MTD device" + depends on !CHAIN_OF_TRUST + depends on MTD + help + Define this if you have a MTD device which you want to use for + the environment. + + - CONFIG_ENV_MTD_NAME: + - CONFIG_ENV_OFFSET: + - CONFIG_ENV_SIZE: + + These three #defines specify the MTD device where the environment + is stored, offset and size of the environment area within the MTD + device. CONFIG_ENV_OFFSET must be aligned to an erase block boundary. + + - CONFIG_ENV_SIZE_REDUND: + + This #define specify the maximum size allowed for read/write/erase + with skipped bad blocks starting from ENV_OFFSET. + config ENV_IS_IN_NAND bool "Environment in a NAND device" depends on !CHAIN_OF_TRUST @@ -561,10 +582,16 @@ config ENV_ADDR_REDUND Offset from the start of the device (or partition) of the redundant environment location. +config ENV_MTD_NAME + string "Name of the MTD device storing the environment" + depends on ENV_IS_IN_MTD + help + Name of the MTD device that stores the environment + config ENV_OFFSET hex "Environment offset" depends on ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \ - ENV_IS_IN_SPI_FLASH + ENV_IS_IN_SPI_FLASH || ENV_IS_IN_MTD default 0x3f8000 if ARCH_ROCKCHIP && ENV_IS_IN_MMC default 0x140000 if ARCH_ROCKCHIP && ENV_IS_IN_SPI_FLASH default 0xF0000 if ARCH_SUNXI @@ -622,6 +649,12 @@ config ENV_SECT_SIZE help Size of the sector containing the environment. +config ENV_SIZE_REDUND + hex "Redundant environment size" + depends on ENV_IS_IN_MTD + help + The maximum size allowed for read/write/erase with skipped bad blocks. + config ENV_UBI_PART string "UBI partition name" depends on ENV_IS_IN_UBI --- a/env/Makefile +++ b/env/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_$(SPL_TPL_)ENV_IS_NOWHERE) obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_MMC) += mmc.o obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_FAT) += fat.o obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_EXT4) += ext4.o +obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_MTD) += mtd.o obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_NAND) += nand.o obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_SPI_FLASH) += sf.o obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_FLASH) += flash.o --- a/env/env.c +++ b/env/env.c @@ -46,6 +46,9 @@ static enum env_location env_locations[] #ifdef CONFIG_ENV_IS_IN_MMC ENVL_MMC, #endif +#ifdef CONFIG_ENV_IS_IN_MTD + ENVL_MTD, +#endif #ifdef CONFIG_ENV_IS_IN_NAND ENVL_NAND, #endif --- /dev/null +++ b/env/mtd.c @@ -0,0 +1,256 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2021 MediaTek Inc. All Rights Reserved. + * + * Author: Weijie Gao + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE +#undef CONFIG_ENV_SIZE_REDUND +#define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE +#endif + +#if defined(ENV_IS_EMBEDDED) +env_t *env_ptr = &environment; +#else /* ! ENV_IS_EMBEDDED */ +env_t *env_ptr; +#endif /* ENV_IS_EMBEDDED */ + +DECLARE_GLOBAL_DATA_PTR; + +static int env_mtd_init(void) +{ +#if defined(ENV_IS_EMBEDDED) + int crc1_ok = 0, crc2_ok = 0; + env_t *tmp_env1; + + tmp_env1 = env_ptr; + crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc; + + if (!crc1_ok && !crc2_ok) { + gd->env_addr = 0; + gd->env_valid = ENV_INVALID; + + return 0; + } else if (crc1_ok && !crc2_ok) { + gd->env_valid = ENV_VALID; + } + + if (gd->env_valid == ENV_VALID) + env_ptr = tmp_env1; + + gd->env_addr = (ulong)env_ptr->data; + +#else /* ENV_IS_EMBEDDED */ + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = ENV_VALID; +#endif /* ENV_IS_EMBEDDED */ + + return 0; +} + +static struct mtd_info *env_mtd_get_dev(void) +{ + struct mtd_info *mtd; + + mtd_probe_devices(); + + mtd = get_mtd_device_nm(CONFIG_ENV_MTD_NAME); + if (IS_ERR(mtd) || !mtd) { + printf("MTD device '%s' not found\n", CONFIG_ENV_MTD_NAME); + return NULL; + } + + return mtd; +} + +static inline bool mtd_addr_is_block_aligned(struct mtd_info *mtd, u64 addr) +{ + return (addr & mtd->erasesize_mask) == 0; +} + +static int mtd_io_skip_bad(struct mtd_info *mtd, bool read, loff_t offset, + size_t length, size_t redund, u8 *buffer) +{ + struct mtd_oob_ops io_op = {}; + size_t remaining = length; + loff_t off, end; + int ret; + + io_op.mode = MTD_OPS_PLACE_OOB; + io_op.len = mtd->writesize; + io_op.datbuf = (void *)buffer; + + /* Search for the first good block after the given offset */ + off = offset; + end = (off + redund) | (mtd->erasesize - 1); + while (mtd_block_isbad(mtd, off) && off < end) + off += mtd->erasesize; + + /* Reached end position */ + if (off >= end) + return -EIO; + + /* Loop over the pages to do the actual read/write */ + while (remaining) { + /* Skip the block if it is bad */ + if (mtd_addr_is_block_aligned(mtd, off) && + mtd_block_isbad(mtd, off)) { + off += mtd->erasesize; + continue; + } + + if (read) + ret = mtd_read_oob(mtd, off, &io_op); + else + ret = mtd_write_oob(mtd, off, &io_op); + + if (ret) { + printf("Failure while %s at offset 0x%llx\n", + read ? "reading" : "writing", off); + break; + } + + off += io_op.retlen; + remaining -= io_op.retlen; + io_op.datbuf += io_op.retlen; + io_op.oobbuf += io_op.oobretlen; + + /* Reached end position */ + if (off >= end) + return -EIO; + } + + return 0; +} + +#ifdef CONFIG_CMD_SAVEENV +static int mtd_erase_skip_bad(struct mtd_info *mtd, loff_t offset, + size_t length, size_t redund) +{ + struct erase_info erase_op = {}; + loff_t end = (offset + redund) | (mtd->erasesize - 1); + int ret; + + erase_op.mtd = mtd; + erase_op.addr = offset; + erase_op.len = length; + + while (erase_op.len) { + ret = mtd_erase(mtd, &erase_op); + + /* Abort if its not a bad block error */ + if (ret != -EIO) + return ret; + + printf("Skipping bad block at 0x%08llx\n", erase_op.fail_addr); + + /* Skip bad block and continue behind it */ + erase_op.len -= erase_op.fail_addr - erase_op.addr; + erase_op.len -= mtd->erasesize; + erase_op.addr = erase_op.fail_addr + mtd->erasesize; + + /* Reached end position */ + if (erase_op.addr >= end) + return -EIO; + } + + return 0; +} + +static int env_mtd_save(void) +{ + ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1); + struct mtd_info *mtd; + int ret = 0; + + ret = env_export(env_new); + if (ret) + return ret; + + mtd = env_mtd_get_dev(); + if (!mtd) + return 1; + + printf("Erasing on MTD device '%s'... ", mtd->name); + + ret = mtd_erase_skip_bad(mtd, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, + CONFIG_ENV_SIZE_REDUND); + + puts(ret ? "FAILED\n" : "OK\n"); + + if (ret) { + put_mtd_device(mtd); + return 1; + } + + printf("Writing to MTD device '%s'... ", mtd->name); + + ret = mtd_io_skip_bad(mtd, false, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, + CONFIG_ENV_SIZE_REDUND, (u8 *)env_new); + + puts(ret ? "FAILED\n" : "OK\n"); + + put_mtd_device(mtd); + + return !!ret; +} +#endif /* CONFIG_CMD_SAVEENV */ + +static int readenv(size_t offset, u_char *buf) +{ + struct mtd_info *mtd; + int ret; + + mtd = env_mtd_get_dev(); + if (!mtd) + return 1; + + ret = mtd_io_skip_bad(mtd, true, offset, CONFIG_ENV_SIZE, + CONFIG_ENV_SIZE_REDUND, buf); + + put_mtd_device(mtd); + + return !!ret; +} + +static int env_mtd_load(void) +{ +#if !defined(ENV_IS_EMBEDDED) + ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE); + int ret; + + ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf); + if (ret) { + env_set_default("readenv() failed", 0); + return -EIO; + } + + return env_import(buf, 1, H_EXTERNAL); +#endif /* ! ENV_IS_EMBEDDED */ + + return 0; +} + +U_BOOT_ENV_LOCATION(mtd) = { + .location = ENVL_MTD, + ENV_NAME("MTD") + .load = env_mtd_load, +#if defined(CONFIG_CMD_SAVEENV) + .save = env_save_ptr(env_mtd_save), +#endif + .init = env_mtd_init, +}; --- a/include/env_internal.h +++ b/include/env_internal.h @@ -107,6 +107,7 @@ enum env_location { ENVL_FAT, ENVL_FLASH, ENVL_MMC, + ENVL_MTD, ENVL_NAND, ENVL_NVRAM, ENVL_ONENAND, --- a/tools/Makefile +++ b/tools/Makefile @@ -37,6 +37,7 @@ subdir-$(HOST_TOOLS_ALL) += gdb ENVCRC-$(CONFIG_ENV_IS_IN_EEPROM) = y ENVCRC-$(CONFIG_ENV_IS_IN_FLASH) = y ENVCRC-$(CONFIG_ENV_IS_IN_ONENAND) = y +ENVCRC-$(CONFIG_ENV_IS_IN_MTD) = y ENVCRC-$(CONFIG_ENV_IS_IN_NAND) = y ENVCRC-$(CONFIG_ENV_IS_IN_NVRAM) = y ENVCRC-$(CONFIG_ENV_IS_IN_SPI_FLASH) = y