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Commit 3bd0a995 authored by Prasad Sodagudi's avatar Prasad Sodagudi
Browse files

qcom: scm: provide scm_is_secure_device() api 



Add new scm_is_secure_device() API, so that
all platform drivers can check and take appropriate
action for secure and non-secure devices.

Change-Id: I5569f4aaf4bcbec2922a7745ec0fdc1ab423cc23
Signed-off-by: default avatarPrasad Sodagudi <psodagud@codeaurora.org>
parent 7cf3ab10

drivers/soc/qcom/scm.c

+36 −0
Original line number Diff line number Diff line
@@ -1200,3 +1200,39 @@ int scm_restore_sec_cfg(u32 device_id, u32 spare, int *scm_ret) 
	return 0;

}

EXPORT_SYMBOL(scm_restore_sec_cfg);



/*

 * SCM call command ID to check secure mode

 * Return zero for secure device.

 * Return one for non secure device or secure

 * device with debug enabled device.

 */

#define TZ_INFO_GET_SECURE_STATE	0x4

bool scm_is_secure_device(void)

{

	struct scm_desc desc = {0};

	int ret = 0, resp;



	desc.args[0] = 0;

	desc.arginfo = 0;

	if (!is_scm_armv8()) {

		ret = scm_call(SCM_SVC_INFO, TZ_INFO_GET_SECURE_STATE, NULL,

			0, &resp, sizeof(resp));

	} else {

		ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO,

				TZ_INFO_GET_SECURE_STATE),

				&desc);

		resp = desc.ret[0];

	}



	if (ret) {

		pr_err("%s: SCM call failed\n", __func__);

		return false;

	}



	if ((resp & BIT(0)) || (resp & BIT(2)))

		return true;

	else

		return false;

}

EXPORT_SYMBOL(scm_is_secure_device);

include/soc/qcom/scm.h

+6 −0
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ extern bool is_scm_armv8(void); 
extern int scm_restore_sec_cfg(u32 device_id, u32 spare, int *scm_ret);

extern u32 scm_io_read(phys_addr_t address);

extern int scm_io_write(phys_addr_t address, u32 val);

extern bool scm_is_secure_device(void);



#define SCM_HDCP_MAX_REG 5
@@ -227,5 +228,10 @@ static inline int scm_io_write(phys_addr_t address, u32 val) 
{

	return 0;

}



inline bool scm_is_secure_device(void)

{

	return false;

}

#endif

#endif