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arm: meson: implement calls to secure monitor

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Implement calls to secure monitor to read the MAC address from e-fuse.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
This commit is contained in:
Beniamino Galvani 2016-05-08 08:30:17 +02:00 committed by Tom Rini
parent bfcef28ae4
commit c7757d4695
5 changed files with 87 additions and 1 deletions
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12
arch/arm/include/asm/arch-meson/sm.h Normal file
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@ -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__ */

2
arch/arm/mach-meson/Makefile
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@ -4,4 +4,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
obj-y += board.o
obj-y += board.o sm.o

1
arch/arm/mach-meson/board.c
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@ -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>

57
arch/arm/mach-meson/sm.c Normal file
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@ -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(&regs);
shmem_input = (void *)regs.regs[0];
regs.regs[0] = FN_GET_SHARE_MEM_OUTPUT_BASE;
smc_call(&regs);
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(&regs);
if (regs.regs[0] == 0)
return -1;
memcpy(buffer, shmem_output, min(size, regs.regs[0]));
return regs.regs[0];
}

16
board/hardkernel/odroid-c2/odroid-c2.c
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@ -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;
}