Implement calls to secure monitor to read the MAC address from e-fuse.
Signed-off-by: Beniamino Galvani b.galvani@gmail.com --- arch/arm/include/asm/arch-meson/sm.h | 12 +++++++ arch/arm/mach-meson/Makefile | 2 +- arch/arm/mach-meson/board.c | 1 + arch/arm/mach-meson/sm.c | 57 ++++++++++++++++++++++++++++++++++ board/hardkernel/odroid-c2/odroid-c2.c | 16 ++++++++++ 5 files changed, 87 insertions(+), 1 deletion(-) create mode 100644 arch/arm/include/asm/arch-meson/sm.h create mode 100644 arch/arm/mach-meson/sm.c
diff --git a/arch/arm/include/asm/arch-meson/sm.h b/arch/arm/include/asm/arch-meson/sm.h new file mode 100644 index 0000000..225438d --- /dev/null +++ b/arch/arm/include/asm/arch-meson/sm.h @@ -0,0 +1,12 @@ +/* + * (C) Copyright 2016 - Beniamino Galvani b.galvani@gmail.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __MESON_SM_H__ +#define __MESON_SM_H__ + +ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size); + +#endif /* __MESON_SM_H__ */ diff --git a/arch/arm/mach-meson/Makefile b/arch/arm/mach-meson/Makefile index 44e3d63..bf49b8b 100644 --- a/arch/arm/mach-meson/Makefile +++ b/arch/arm/mach-meson/Makefile @@ -4,4 +4,4 @@ # SPDX-License-Identifier: GPL-2.0+ #
-obj-y += board.o +obj-y += board.o sm.o diff --git a/arch/arm/mach-meson/board.c b/arch/arm/mach-meson/board.c index 782f86c..64fa3c1 100644 --- a/arch/arm/mach-meson/board.c +++ b/arch/arm/mach-meson/board.c @@ -8,6 +8,7 @@ #include <libfdt.h> #include <linux/err.h> #include <asm/arch/gxbb.h> +#include <asm/arch/sm.h> #include <asm/armv8/mmu.h> #include <asm/unaligned.h>
diff --git a/arch/arm/mach-meson/sm.c b/arch/arm/mach-meson/sm.c new file mode 100644 index 0000000..1b35a22 --- /dev/null +++ b/arch/arm/mach-meson/sm.c @@ -0,0 +1,57 @@ +/* + * (C) Copyright 2016 Beniamino Galvani b.galvani@gmail.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + * Secure monitor calls. + */ + +#include <common.h> +#include <asm/arch/gxbb.h> +#include <linux/kernel.h> + +#define FN_GET_SHARE_MEM_INPUT_BASE 0x82000020 +#define FN_GET_SHARE_MEM_OUTPUT_BASE 0x82000021 +#define FN_EFUSE_READ 0x82000030 +#define FN_EFUSE_WRITE 0x82000031 + +static void *shmem_input; +static void *shmem_output; + +static void meson_init_shmem(void) +{ + struct pt_regs regs; + + if (shmem_input && shmem_output) + return; + + regs.regs[0] = FN_GET_SHARE_MEM_INPUT_BASE; + smc_call(®s); + shmem_input = (void *)regs.regs[0]; + + regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE; + smc_call(®s); + shmem_output = (void *)regs.regs[0]; + + debug("Secure Monitor shmem: 0x%p 0x%p\n", shmem_input, shmem_output); +} + +ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size) +{ + struct pt_regs regs; + + meson_init_shmem(); + + regs.regs[0] = FN_EFUSE_READ; + regs.regs[1] = offset; + regs.regs[2] = size; + + smc_call(®s); + + if (regs.regs[0] == 0) + return -1; + + memcpy(buffer, shmem_output, min(size, regs.regs[0])); + + return regs.regs[0]; +} diff --git a/board/hardkernel/odroid-c2/odroid-c2.c b/board/hardkernel/odroid-c2/odroid-c2.c index c258d4f..bd72100 100644 --- a/board/hardkernel/odroid-c2/odroid-c2.c +++ b/board/hardkernel/odroid-c2/odroid-c2.c @@ -7,9 +7,15 @@ #include <common.h> #include <asm/io.h> #include <asm/arch/gxbb.h> +#include <asm/arch/sm.h> #include <dm/platdata.h> #include <phy.h>
+#define EFUSE_SN_OFFSET 20 +#define EFUSE_SN_SIZE 16 +#define EFUSE_MAC_OFFSET 52 +#define EFUSE_MAC_SIZE 6 + int board_init(void) { return 0; @@ -27,6 +33,9 @@ U_BOOT_DEVICE(meson_eth) = {
int misc_init_r(void) { + u8 mac_addr[EFUSE_MAC_SIZE]; + ssize_t len; + /* Select Ethernet function */ setbits_le32(GXBB_PINMUX(6), 0x3fff);
@@ -47,5 +56,12 @@ int misc_init_r(void) mdelay(10); setbits_le32(GXBB_GPIO_OUT(3), BIT(14));
+ if (!eth_getenv_enetaddr("ethaddr", mac_addr)) { + len = meson_sm_read_efuse(EFUSE_MAC_OFFSET, + mac_addr, EFUSE_MAC_SIZE); + if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr)) + eth_setenv_enetaddr("ethaddr", mac_addr); + } + return 0; }