[U-Boot] [PATCH 3/5] ARM: DRA7: Add secure emif setup calls

[Allred, Daniel]

On 9/6/2016 3:41 PM, Andrew F. Davis wrote:
> On 09/02/2016 12:40 AM, Daniel Allred wrote:
>> After EMIF DRAM is configured, but before it is used,
>> calls are made on secure devices to reserve any configured
>> memory region needed by the secure world and then to lock the
>> EMIF firewall configuration. If any other firewall
>> configuration needs to be applied, it must happen before the
>> lock call.
>>
>> Signed-off-by: Daniel Allred <d-allred at ti.com>
>> ---
>>  arch/arm/cpu/armv7/omap-common/emif-common.c | 15 +++++++++++++++
>>  1 file changed, 15 insertions(+)
>>
>> diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c
>> index 2b79010..b26984e 100644
>> --- a/arch/arm/cpu/armv7/omap-common/emif-common.c
>> +++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
>> @@ -14,6 +14,7 @@
>>  #include <asm/arch/clock.h>
>>  #include <asm/arch/sys_proto.h>
>>  #include <asm/omap_common.h>
>> +#include <asm/omap_sec_common.h>
>>  #include <asm/utils.h>
>>  #include <linux/compiler.h>
>>  
>> @@ -1477,6 +1478,20 @@ void sdram_init(void)
>>  			debug("get_ram_size() successful");
>>  	}
>>  
>> +#if defined(CONFIG_TI_SECURE_DEVICE)
>> +	/*
>> +	 * On HS devices, do static EMIF firewall configuration
>> +	 * but only do it if not already running in SDRAM
>> +	 */
>> +	if (!in_sdram)
> 
> Should we hang in this case?
The check is supposed to ensure that if we are already in DRAM, we don't apply the firewall config. It might make sense to still (attempt to) do the lock. I need to think a little more on it, but I don't think hanging if in sdram is the right thing.
> 
>> +		if (0 != secure_emif_reserve())
> 
> "0 != " could be removed here and below.
> 
>> +			hang();
>> +
>> +	/* On HS devices, ensure static EMIF firewall APIs are locked */
>> +	if (0 != secure_emif_firewall_lock())
>> +		hang();
>> +#endif
>> +
>>  	if (sdram_type == EMIF_SDRAM_TYPE_DDR3 &&
>>  	    (!in_sdram && !warm_reset()) && (!is_dra7xx())) {
>>  		if (emif1_enabled)
>>