imx8: fuse: add fuse driver

Add fuse write for i.MX8

Signed-off-by: Peng Fan <peng.fan@nxp.com>

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

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;
+}