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/*
* TEE service to handle the calls to trusted applications.
*
* Copyright (C) ST-Ericsson SA 2010
* Author: Joakim Bech <joakim.xx.bech@stericsson.com>
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/tee.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <mach/hardware.h>
#define ISSWAPI_EXECUTE_TA 0x11000001
#define ISSWAPI_CLOSE_TA 0x11000002
#define SEC_ROM_NO_FLAG_MASK 0x0000
static u32 call_sec_rom_bridge(u32 service_id, u32 cfg, ...)
{
typedef u32 (*bridge_func)(u32, u32, va_list);
bridge_func hw_sec_rom_pub_bridge;
va_list ap;
u32 ret;
if (cpu_is_u8500v20_or_later())
hw_sec_rom_pub_bridge = (bridge_func)
((u32)IO_ADDRESS(U8500_BOOT_ROM_BASE + 0x17300));
else if (cpu_is_u5500())
hw_sec_rom_pub_bridge = (bridge_func)
((u32)IO_ADDRESS(U5500_BOOT_ROM_BASE + 0x18300));
else
ux500_unknown_soc();
va_start(ap, cfg);
ret = hw_sec_rom_pub_bridge(service_id, cfg, ap);
va_end(ap);
return ret;
}
int call_sec_world(struct tee_session *ts, int sec_cmd)
{
/*
* ts->ta and ts->uuid is set to NULL when opening the device,
* hence it should be safe to just do the call here.
*/
switch (sec_cmd) {
case TEED_INVOKE:
if (!ts->uuid) {
call_sec_rom_bridge(ISSWAPI_EXECUTE_TA,
SEC_ROM_NO_FLAG_MASK,
virt_to_phys(&ts->id),
NULL,
virt_to_phys(ts->ta),
ts->cmd,
virt_to_phys((void *)(ts->op)),
virt_to_phys((void *)(&ts->err)),
virt_to_phys((void *)(&ts->origin)));
} else {
call_sec_rom_bridge(ISSWAPI_EXECUTE_TA,
SEC_ROM_NO_FLAG_MASK,
virt_to_phys(&ts->id),
virt_to_phys(ts->uuid),
virt_to_phys(ts->ta),
ts->cmd,
virt_to_phys((void *)(ts->op)),
virt_to_phys((void *)(&ts->err)),
virt_to_phys((void *)(&ts->origin)));
}
break;
case TEED_CLOSE_SESSION:
call_sec_rom_bridge(ISSWAPI_CLOSE_TA,
SEC_ROM_NO_FLAG_MASK,
ts->id,
NULL,
virt_to_phys(ts->ta),
virt_to_phys((void *)(&ts->err)));
/* Since the TEE Client API does NOT take care of
* the return value, we print a warning here if
* something went wrong in secure world.
*/
if (ts->err != TEED_SUCCESS)
pr_warning("[%s] failed in secure world\n",
__func__);
break;
}
return 0;
}
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