[U-Boot] [PATCH 2/8] imx8: fuse: add fuse driver

Peng Fan
2019-04-12T07:54:54Z

Add fuse write for i.MX8

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/misc/imx8/Makefile | 1 +
drivers/misc/imx8/fuse.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 87 insertions(+)
create mode 100644 drivers/misc/imx8/fuse.c

diff --git a/drivers/misc/imx8/Makefile b/drivers/misc/imx8/Makefile
index ee05893cbb..48fdb5b61c 100644
--- a/drivers/misc/imx8/Makefile
+++ b/drivers/misc/imx8/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0+

obj-y += scu_api.o scu.o
+obj-$(CONFIG_CMD_FUSE) += fuse.o
diff --git a/drivers/misc/imx8/fuse.c b/drivers/misc/imx8/fuse.c
new file mode 100644
index 0000000000..29d2256a22
--- /dev/null
+++ b/drivers/misc/imx8/fuse.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <common.h>
+#include <console.h>
+#include <errno.h>
+#include <fuse.h>
+#include <asm/arch/sci/sci.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define FSL_ECC_WORD_START_1 0x10
+#define FSL_ECC_WORD_END_1 0x10F
+
+#ifdef CONFIG_IMX8QXP
+#define FSL_ECC_WORD_START_2 0x220
+#define FSL_ECC_WORD_END_2 0x31F
+
+#define FSL_QXP_FUSE_GAP_START 0x110
+#define FSL_QXP_FUSE_GAP_END 0x21F
+#endif
+
+#define FSL_SIP_OTP_READ 0xc200000A
+#define FSL_SIP_OTP_WRITE 0xc200000B
+
+int fuse_read(u32 bank, u32 word, u32 *val)
+{
+ return fuse_sense(bank, word, val);
+}
+
+int fuse_sense(u32 bank, u32 word, u32 *val)
+{
+ unsigned long ret = 0, value = 0;
+
+ if (bank != 0) {
+ printf("Invalid bank argument, ONLY bank 0 is supported\n");
+ return -EINVAL;
+ }
+
+ ret = call_imx_sip_ret2(FSL_SIP_OTP_READ, (unsigned long)word, &value,
+ 0, 0);
+ *val = (u32)value;
+
+ return ret;
+}
+
+int fuse_prog(u32 bank, u32 word, u32 val)
+{
+ if (bank != 0) {
+ printf("Invalid bank argument, ONLY bank 0 is supported\n");
+ return -EINVAL;
+ }
+
+ if (IS_ENABLED(CONFIG_IMX8QXP)) {
+ if (word >= FSL_QXP_FUSE_GAP_START &&
+ word <= FSL_QXP_FUSE_GAP_END) {
+ printf("Invalid word argument for this SoC\n");
+ return -EINVAL;
+ }
+ }
+
+ if ((word >= FSL_ECC_WORD_START_1 && word <= FSL_ECC_WORD_END_1) ||
+ (word >= FSL_ECC_WORD_START_2 && word <= FSL_ECC_WORD_END_2)) {
+ puts("Warning: Words in this index range have ECC protection\n"
+ "and can only be programmed once per word. Individual bit\n"
+ "operations will be rejected after the first one.\n"
+ "\n\n Really program this word? <y/N>\n");
+
+ if (!confirm_yesno()) {
+ puts("Word programming aborted\n");
+ return -EPERM;
+ }
+ }
+
+ return call_imx_sip(FSL_SIP_OTP_WRITE, (unsigned long)word,
+ (unsigned long)val, 0);
+}
+
+int fuse_override(u32 bank, u32 word, u32 val)
+{
+ printf("Override fuse to i.MX8 in u-boot is forbidden\n");
+ return -EPERM;
+}
--
2.16.4