From: Ye Li <ye...@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...@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;
+}
--
2.30.0
