From: Ye Li ye.li@nxp.com
This driver uses FSB to read some fuses, but not support program fuse. It only works in SPL (secure mode), u-boot needs traps to ATF to read them.
Some fuses can read from S400 API and others are from FSB. Also support program some fuses via S400 API
Signed-off-by: Ye Li ye.li@nxp.com --- drivers/misc/imx8ulp/Makefile | 1 + drivers/misc/imx8ulp/fuse.c | 198 ++++++++++++++++++++++++++++++++++ 2 files changed, 199 insertions(+) create mode 100644 drivers/misc/imx8ulp/fuse.c
diff --git a/drivers/misc/imx8ulp/Makefile b/drivers/misc/imx8ulp/Makefile index 1d792415d2..927cc55216 100644 --- a/drivers/misc/imx8ulp/Makefile +++ b/drivers/misc/imx8ulp/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0+
obj-y += s400_api.o imx8ulp_mu.o +obj-$(CONFIG_CMD_FUSE) += fuse.o diff --git a/drivers/misc/imx8ulp/fuse.c b/drivers/misc/imx8ulp/fuse.c new file mode 100644 index 0000000000..d1feb62ab5 --- /dev/null +++ b/drivers/misc/imx8ulp/fuse.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2020 NXP + */ + +#include <common.h> +#include <console.h> +#include <errno.h> +#include <fuse.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/imx-regs.h> +#include <env.h> +#include <asm/arch/s400_api.h> +#include <asm/global_data.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define FUSE_BANKS 64 +#define WORDS_PER_BANKS 8 + +struct fsb_map_entry { + s32 fuse_bank; + u32 fuse_words; + bool redundancy; +}; + +struct s400_map_entry { + s32 fuse_bank; + u32 fuse_words; + u32 fuse_offset; + u32 s400_index; +}; + +struct fsb_map_entry fsb_mapping_table[] = { + { 3, 8 }, + { 4, 8 }, + { 5, 8 }, + { 6, 8 }, + { -1, 48 }, /* Reserve 48 words */ + { 8, 4, true }, + { 24, 4, true }, + { 26, 4, true }, + { 27, 4, true }, + { 28, 8 }, + { 29, 8 }, + { 30, 8 }, + { 31, 8 }, + { 37, 8 }, + { 38, 8 }, + { 39, 8 }, + { 40, 8 }, + { 41, 8 }, + { 42, 8 }, + { 43, 8 }, + { 44, 8 }, + { 45, 8 }, + { 46, 8 }, +}; + +struct s400_map_entry s400_api_mapping_table[] = { + { 1, 8 }, /* LOCK */ + { 2, 8 }, /* ECID */ + { 7, 4, 0, 1 }, /* OTP_UNIQ_ID */ + { 23, 1, 4, 2 }, /* OTFAD */ +}; + +static s32 map_fsb_fuse_index(u32 bank, u32 word, bool *redundancy) +{ + s32 size = ARRAY_SIZE(fsb_mapping_table); + s32 i, word_pos = 0; + + /* map the fuse from ocotp fuse map to FSB*/ + for (i = 0; i < size; i++) { + if (fsb_mapping_table[i].fuse_bank != -1 && + fsb_mapping_table[i].fuse_bank == bank) { + break; + } + + word_pos += fsb_mapping_table[i].fuse_words; + } + + if (i == size) + return -1; /* Failed to find */ + + if (fsb_mapping_table[i].redundancy) { + *redundancy = true; + return (word >> 1) + word_pos; + } + + *redundancy = false; + return word + word_pos; +} + +static s32 map_s400_fuse_index(u32 bank, u32 word) +{ + s32 size = ARRAY_SIZE(s400_api_mapping_table); + s32 i; + + /* map the fuse from ocotp fuse map to FSB*/ + for (i = 0; i < size; i++) { + if (s400_api_mapping_table[i].fuse_bank != -1 && + s400_api_mapping_table[i].fuse_bank == bank) { + if (word >= s400_api_mapping_table[i].fuse_offset && + word < (s400_api_mapping_table[i].fuse_offset + + s400_api_mapping_table[i].fuse_words)) + break; + } + } + + if (i == size) + return -1; /* Failed to find */ + + if (s400_api_mapping_table[i].s400_index != 0) + return s400_api_mapping_table[i].s400_index; + + return s400_api_mapping_table[i].fuse_bank * 8 + word; +} + +int fuse_sense(u32 bank, u32 word, u32 *val) +{ + s32 word_index; + bool redundancy; + + if (bank >= FUSE_BANKS || word >= WORDS_PER_BANKS || !val) + return -EINVAL; + + word_index = map_fsb_fuse_index(bank, word, &redundancy); + if (word_index >= 0) { + *val = readl((ulong)FSB_BASE_ADDR + 0x800 + (word_index << 2)); + if (redundancy) + *val = (*val >> ((word % 2) * 16)) & 0xFFFF; + + return 0; + } + + word_index = map_s400_fuse_index(bank, word); + if (word_index >= 0) { + u32 data[4]; + u32 res, size = 4; + int ret; + + /* Only UID return 4 words */ + if (word_index != 1) + size = 1; + + ret = ahab_read_common_fuse(word_index, data, size, &res); + if (ret) { + printf("ahab read fuse failed %d, 0x%x\n", ret, res); + return ret; + } + + if (word_index == 1) { + *val = data[word]; /* UID */ + } else if (word_index == 2) { + /* + * OTFAD 3 bits as follow: + * bit 0: OTFAD_ENABLE + * bit 1: OTFAD_DISABLE_OVERRIDE + * bit 2: KEY_BLOB_EN + */ + *val = data[0] << 3; + } else { + *val = data[0]; + } + + return 0; + } + + return -ENOENT; +} + +int fuse_read(u32 bank, u32 word, u32 *val) +{ + return fuse_sense(bank, word, val); +} + +int fuse_prog(u32 bank, u32 word, u32 val) +{ + u32 res; + int ret; + + if (bank >= FUSE_BANKS || word >= WORDS_PER_BANKS || !val) + return -EINVAL; + + ret = ahab_write_fuse((bank * 8 + word), val, false, &res); + if (ret) { + printf("ahab write fuse failed %d, 0x%x\n", ret, res); + return ret; + } + + return 0; +} + +int fuse_override(u32 bank, u32 word, u32 val) +{ + printf("Override fuse to i.MX8ULP in u-boot is forbidden\n"); + return -EPERM; +}