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authorVyacheslav Bocharov <adeep@lexina.in>2021-10-05 15:00:03 +0300
committerNeil Armstrong <narmstrong@baylibre.com>2021-10-29 14:06:45 +0200
commit52195ba5f5799e04f7dd6332d05087f507119007 (patch)
tree2a06947b41ed8dc130d908934064c84c5c1c5a0e /arch
parentaafc378a6caef453a40f2f9f3d6bef69e592c28d (diff)
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ARM: amlogic: add sm efuse write support and cmd for read/write efuse
This adds support for amlogic efuse write and provides two subcommands of "sm" command: "efuseread" and "efusewrite" to read/write bytes between memory and efuse. Signed-off-by: Vyacheslav Bocharov <adeep@lexina.in> [narmstrong: fixed indent at end of patch] Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-meson/sm.c68
1 files changed, 67 insertions, 1 deletions
diff --git a/arch/arm/mach-meson/sm.c b/arch/arm/mach-meson/sm.c
index 1a8f23c..6c28c0f 100644
--- a/arch/arm/mach-meson/sm.c
+++ b/arch/arm/mach-meson/sm.c
@@ -68,6 +68,26 @@ ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
return regs.regs[0];
}
+ssize_t meson_sm_write_efuse(uintptr_t offset, void *buffer, size_t size)
+{
+ struct pt_regs regs;
+
+ meson_init_shmem();
+
+ memcpy(shmem_input, buffer, size);
+
+ regs.regs[0] = FN_EFUSE_WRITE;
+ regs.regs[1] = offset;
+ regs.regs[2] = size;
+
+ smc_call(&regs);
+
+ if (regs.regs[0] == 0)
+ return -1;
+
+ return 0;
+}
+
#define SM_CHIP_ID_LENGTH 119
#define SM_CHIP_ID_OFFSET 4
#define SM_CHIP_ID_SIZE 12
@@ -187,9 +207,53 @@ static int do_sm_reboot_reason(struct cmd_tbl *cmdtp, int flag, int argc,
return CMD_RET_SUCCESS;
}
+static int do_efuse_read(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ ulong address, offset, size;
+ int ret;
+
+ if (argc < 4)
+ return CMD_RET_USAGE;
+
+ offset = simple_strtoul(argv[1], NULL, 0);
+ size = simple_strtoul(argv[2], NULL, 0);
+
+ address = simple_strtoul(argv[3], NULL, 0);
+
+ ret = meson_sm_read_efuse(offset, (void *)address, size);
+ if (ret)
+ return CMD_RET_FAILURE;
+
+ return CMD_RET_SUCCESS;
+}
+
+static int do_efuse_write(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ ulong address, offset, size;
+ int ret;
+
+ if (argc < 4)
+ return CMD_RET_USAGE;
+
+ offset = simple_strtoul(argv[1], NULL, 0);
+ size = simple_strtoul(argv[2], NULL, 0);
+
+ address = simple_strtoul(argv[3], NULL, 0);
+
+ ret = meson_sm_write_efuse(offset, (void *)address, size);
+ if (ret)
+ return CMD_RET_FAILURE;
+
+ return CMD_RET_SUCCESS;
+}
+
static struct cmd_tbl cmd_sm_sub[] = {
U_BOOT_CMD_MKENT(serial, 2, 1, do_sm_serial, "", ""),
U_BOOT_CMD_MKENT(reboot_reason, 1, 1, do_sm_reboot_reason, "", ""),
+ U_BOOT_CMD_MKENT(efuseread, 4, 1, do_efuse_read, "", ""),
+ U_BOOT_CMD_MKENT(efusewrite, 4, 0, do_efuse_write, "", ""),
};
static int do_sm(struct cmd_tbl *cmdtp, int flag, int argc,
@@ -216,5 +280,7 @@ U_BOOT_CMD(
sm, 5, 0, do_sm,
"Secure Monitor Control",
"serial <address> - read chip unique id to memory address\n"
- "sm reboot_reason [name] - get reboot reason and store to to environment"
+ "sm reboot_reason [name] - get reboot reason and store to to environment\n"
+ "sm efuseread <offset> <size> <address> - read efuse to memory address\n"
+ "sm efusewrite <offset> <size> <address> - write into efuse from memory address"
);