imx: sip: add call_imx_sip_ret2

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

Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h
index d0f866b6306bbb9d0365a4873b95ab606f229555..4925dd7894510c39343bf82d207beb0db5215b23 100644 (file)
--- 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 813c2ae5e11cf3415241e63c98b8bfaa1124647f..968e7cf3097356849f4c85d50845efed02366043 100644 (file)
--- 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(&regs);
+
+       *reg1 = regs.regs[1];
+
+       return regs.regs[0];
+}