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imx: sip: add call_imx_sip_ret2

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This function will be used by i.MX8 fuse driver.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Peng Fan 2019-04-12 07:54:50 +00:00 committed by Stefano Babic
parent 3fbd2dce35
commit a87eb0405f
2 changed files with 25 additions and 0 deletions
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3
arch/arm/include/asm/mach-imx/sys_proto.h
View file

@ -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

22
arch/arm/mach-imx/sip.c
View file

@ -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(&regs);
*reg1 = regs.regs[1];
return regs.regs[0];
}