This function will be used by i.MX8 fuse driver.
Signed-off-by: Peng Fan peng.fan@nxp.com --- arch/arm/include/asm/mach-imx/sys_proto.h | 3 +++ arch/arm/mach-imx/sip.c | 22 ++++++++++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h index d0f866b630..4925dd7894 100644 --- a/arch/arm/include/asm/mach-imx/sys_proto.h +++ b/arch/arm/include/asm/mach-imx/sys_proto.h @@ -134,4 +134,7 @@ int mxs_wait_mask_clr(struct mxs_register_32 *reg, u32 mask, u32 timeout);
unsigned long call_imx_sip(unsigned long id, unsigned long reg0, unsigned long reg1, unsigned long reg2); +unsigned long call_imx_sip_ret2(unsigned long id, unsigned long reg0, + unsigned long *reg1, unsigned long reg2, + unsigned long reg3); #endif diff --git a/arch/arm/mach-imx/sip.c b/arch/arm/mach-imx/sip.c index 813c2ae5e1..968e7cf309 100644 --- a/arch/arm/mach-imx/sip.c +++ b/arch/arm/mach-imx/sip.c @@ -20,3 +20,25 @@ unsigned long call_imx_sip(unsigned long id, unsigned long reg0,
return regs.regs[0]; } + +/* + * Do an SMC call to return 2 registers by having reg1 passed in by reference + */ +unsigned long call_imx_sip_ret2(unsigned long id, unsigned long reg0, + unsigned long *reg1, unsigned long reg2, + unsigned long reg3) +{ + struct pt_regs regs; + + regs.regs[0] = id; + regs.regs[1] = reg0; + regs.regs[2] = *reg1; + regs.regs[3] = reg2; + regs.regs[4] = reg3; + + smc_call(®s); + + *reg1 = regs.regs[1]; + + return regs.regs[0]; +}