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board: ti: am654: Disable TRNG node for HS devices

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On HS devices the access to TRNG is restricted on the non-secure
ARM side, disable the node in DT to prevent firewall violations.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Andrew F. Davis 2019-09-17 17:15:40 -04:00 committed by Tom Rini
parent dd2d989972
commit 29c9db4d98
3 changed files with 35 additions and 2 deletions
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20
arch/arm/mach-k3/common.c
View file

@ -137,6 +137,26 @@ int fdt_fixup_msmc_ram(void *blob, char *parent_path, char *node_name)
return 0;
}
int fdt_disable_node(void *blob, char *node_path)
{
int offs;
int ret;
offs = fdt_path_offset(blob, node_path);
if (offs < 0) {
debug("Node %s not found.\n", node_path);
return 0;
}
ret = fdt_setprop_string(blob, offs, "status", "disabled");
if (ret < 0) {
printf("Could not add status property to node %s: %s\n",
node_path, fdt_strerror(ret));
return ret;
}
return 0;
}
#endif
#ifndef CONFIG_SYSRESET

2
arch/arm/mach-k3/include/mach/sys_proto.h
View file

@ -14,4 +14,6 @@ struct ti_sci_handle *get_ti_sci_handle(void);
int fdt_fixup_msmc_ram(void *blob, char *parent_path, char *node_name);
int do_board_detect(void);
void release_resources_for_core_shutdown(void);
int fdt_disable_node(void *blob, char *node_path);
#endif

15
board/ti/am65x/evm.c
View file

@ -96,10 +96,21 @@ int ft_board_setup(void *blob, bd_t *bd)
int ret;
ret = fdt_fixup_msmc_ram(blob, "/interconnect@100000", "sram@70000000");
if (ret)
if (ret) {
printf("%s: fixing up msmc ram failed %d\n", __func__, ret);
return ret;
}
#if defined(CONFIG_TI_SECURE_DEVICE)
/* Make HW RNG reserved for secure world use */
ret = fdt_disable_node(blob, "/interconnect@100000/trng@4e10000");
if (ret) {
printf("%s: disabling TRGN failed %d\n", __func__, ret);
return ret;
}
#endif
return 0;
}
#endif