linux-kernel - [RFC 10/17] firmware: qcom_scm-32: Use SMC arch wrappers

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Message-Id: <1572378065-4490-11-git-send-email-eberman@codeaurora.org>
Date:   Tue, 29 Oct 2019 12:40:58 -0700
From:   Elliot Berman <eberman@...eaurora.org>
To:     bjorn.andersson@...aro.org, saipraka@...eaurora.org,
        agross@...nel.org
Cc:     tsoni@...eaurora.org, sidgup@...eaurora.org,
        psodagud@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Elliot Berman <eberman@...eaurora.org>
Subject: [RFC 10/17] firmware: qcom_scm-32: Use SMC arch wrappers

Use SMC arch wrappers instead of inline assembly.

Signed-off-by: Elliot Berman <eberman@...eaurora.org>
---
 drivers/firmware/qcom_scm-32.c | 71 ++++++++++--------------------------------
 1 file changed, 17 insertions(+), 54 deletions(-)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index b2805de..e6d0a87 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/qcom_scm.h>
+#include <linux/arm-smccc.h>
 #include <linux/dma-mapping.h>
 
 #include "qcom_scm.h"
@@ -121,25 +122,13 @@ static inline void *legacy_get_response_buffer(const struct legacy_response *rsp
 static u32 __qcom_scm_call_do(u32 cmd_addr)
 {
 	int context_id;
-	register u32 r0 asm("r0") = 1;
-	register u32 r1 asm("r1") = (u32)&context_id;
-	register u32 r2 asm("r2") = cmd_addr;
+	struct arm_smccc_res res;
 	do {
-		asm volatile(
-			__asmeq("%0", "r0")
-			__asmeq("%1", "r0")
-			__asmeq("%2", "r1")
-			__asmeq("%3", "r2")
-#ifdef REQUIRES_SEC
-			".arch_extension sec\n"
-#endif
-			"smc	#0	@ switch to secure world\n"
-			: "=r" (r0)
-			: "r" (r0), "r" (r1), "r" (r2)
-			: "r3", "r12");
-	} while (r0 == QCOM_SCM_INTERRUPTED);
-
-	return r0;
+		arm_smccc_smc(1, (unsigned long)&context_id, cmd_addr,
+			      0, 0, 0, 0, 0, &res);
+	} while (res.a0 == QCOM_SCM_INTERRUPTED);
+
+	return res.a0;
 }
 
 /**
@@ -236,24 +225,12 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
 static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
 {
 	int context_id;
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(LEGACY_ATOMIC(svc, cmd, 1), (unsigned long)&context_id,
+		      arg1, 0, 0, 0, 0, 0, &res);
 
-	register u32 r0 asm("r0") = LEGACY_ATOMIC(svc, cmd, 1);
-	register u32 r1 asm("r1") = (u32)&context_id;
-	register u32 r2 asm("r2") = arg1;
-
-	asm volatile(
-			__asmeq("%0", "r0")
-			__asmeq("%1", "r0")
-			__asmeq("%2", "r1")
-			__asmeq("%3", "r2")
-#ifdef REQUIRES_SEC
-			".arch_extension sec\n"
-#endif
-			"smc    #0      @ switch to secure world\n"
-			: "=r" (r0)
-			: "r" (r0), "r" (r1), "r" (r2)
-			: "r3", "r12");
-	return r0;
+	return res.a0;
 }
 
 /**
@@ -269,26 +246,12 @@ static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
 static s32 qcom_scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2)
 {
 	int context_id;
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(LEGACY_ATOMIC(svc, cmd, 2), (unsigned long)&context_id,
+		      arg1, arg2, 0, 0, 0, 0, &res);
 
-	register u32 r0 asm("r0") = LEGACY_ATOMIC(svc, cmd, 2);
-	register u32 r1 asm("r1") = (u32)&context_id;
-	register u32 r2 asm("r2") = arg1;
-	register u32 r3 asm("r3") = arg2;
-
-	asm volatile(
-			__asmeq("%0", "r0")
-			__asmeq("%1", "r0")
-			__asmeq("%2", "r1")
-			__asmeq("%3", "r2")
-			__asmeq("%4", "r3")
-#ifdef REQUIRES_SEC
-			".arch_extension sec\n"
-#endif
-			"smc    #0      @ switch to secure world\n"
-			: "=r" (r0)
-			: "r" (r0), "r" (r1), "r" (r2), "r" (r3)
-			: "r12");
-	return r0;
+	return res.a0;
 }
 
 /**
-- 
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