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openwrt/package/boot/uboot-mediatek/patches/100-04-env-add-support-for-generic-MTD-device.patch
Daniel Golle f8c22c9bff uboot-mediatek: update to U-Boot 2024.10 
Update to latest U-Boot release.
Patches refreshed and fixed when needed.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2024-10-13 03:00:45 +01:00

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From efc3e6f5d29f87a433b42f15a0b87e04b7cd498d Mon Sep 17 00:00:00 2001
From: Weijie Gao <weijie.gao@mediatek.com>
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 <weijie.gao@mediatek.com>
---
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 <weijie.gao@mediatek.com>
+ */
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <errno.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/mtd/mtd.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <mtd.h>
+#include <search.h>
+
+#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
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