firmware: smccc: Refactor SMCCC specific bits into separate file

In order to add newer SMCCC v1.1+ functionality and to avoid cluttering
PSCI firmware driver with SMCCC bits, let us move the SMCCC specific
details under drivers/firmware/smccc/smccc.c

We can also drop conduit and smccc_version from psci_operations structure
as SMCCC was the sole user and now it maintains those.

No functionality change in this patch though.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Etienne Carriere <etienne.carriere@st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@st.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200518091222.27467-6-sudeep.holla@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/MAINTAINERS b/MAINTAINERS
index 26f281d9f32a4ad35d744a90353c93177b309287..cb993caf5cd26de88c01f25abc4b92d47b885f24 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15474,6 +15474,15 @@ M:     Nicolas Pitre <nico@fluxnic.net>
 S:     Odd Fixes
 F:     drivers/net/ethernet/smsc/smc91x.*
 
+SECURE MONITOR CALL(SMC) CALLING CONVENTION (SMCCC)
+M:     Mark Rutland <mark.rutland@arm.com>
+M:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+M:     Sudeep Holla <sudeep.holla@arm.com>
+L:     linux-arm-kernel@lists.infradead.org
+S:     Maintained
+F:     drivers/firmware/smccc/
+F:     include/linux/arm-smccc.h
+
 SMIA AND SMIA++ IMAGE SENSOR DRIVER
 M:     Sakari Ailus <sakari.ailus@linux.intel.com>
 L:     linux-media@vger.kernel.org

diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index e9fb838af4dff087e11737af9c493022312d1943..99510be9f5ed9b2d41830a81d8c258e77928effb 100644 (file)
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -23,12 +23,13 @@ obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o
 obj-$(CONFIG_TURRIS_MOX_RWTM)  += turris-mox-rwtm.o
 
 obj-$(CONFIG_ARM_SCMI_PROTOCOL)        += arm_scmi/
-obj-y                          += psci/
 obj-y                          += broadcom/
 obj-y                          += meson/
 obj-$(CONFIG_GOOGLE_FIRMWARE)  += google/
 obj-$(CONFIG_EFI)              += efi/
 obj-$(CONFIG_UEFI_CPER)                += efi/
 obj-y                          += imx/
+obj-y                          += psci/
+obj-y                          += smccc/
 obj-y                          += tegra/
 obj-y                          += xilinx/

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index 6a56d7196697e220d7a737ba19c6295a673d94cd..1330a698a1789af95476117e0c623db84a0573ed 100644 (file)
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -46,25 +46,14 @@
  * require cooperation with a Trusted OS driver.
  */
 static int resident_cpu = -1;
+struct psci_operations psci_ops;
+static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
 
 bool psci_tos_resident_on(int cpu)
 {
        return cpu == resident_cpu;
 }
 
-struct psci_operations psci_ops = {
-       .conduit = SMCCC_CONDUIT_NONE,
-       .smccc_version = ARM_SMCCC_VERSION_1_0,
-};
-
-enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
-{
-       if (psci_ops.smccc_version < ARM_SMCCC_VERSION_1_1)
-               return SMCCC_CONDUIT_NONE;
-
-       return psci_ops.conduit;
-}
-
 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
                                unsigned long, unsigned long);
 static psci_fn *invoke_psci_fn;
@@ -90,6 +79,7 @@ static u32 psci_function_id[PSCI_FN_MAX];
 
 static u32 psci_cpu_suspend_feature;
 static bool psci_system_reset2_supported;
+void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
 
 static inline bool psci_has_ext_power_state(void)
 {
@@ -242,7 +232,7 @@ static void set_conduit(enum arm_smccc_conduit conduit)
                WARN(1, "Unexpected PSCI conduit %d\n", conduit);
        }
 
-       psci_ops.conduit = conduit;
+       psci_conduit = conduit;
 }
 
 static int get_set_conduit_method(struct device_node *np)
@@ -412,7 +402,7 @@ static void __init psci_init_smccc(void)
                u32 ret;
                ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
                if (ret >= ARM_SMCCC_VERSION_1_1) {
-                       psci_ops.smccc_version = ret;
+                       arm_smccc_version_init(ret, psci_conduit);
                        ver = ret;
                }
        }

diff --git a/drivers/firmware/smccc/Makefile b/drivers/firmware/smccc/Makefile
new file mode 100644 (file)
index 0000000..6f369fe
--- /dev/null
+++ b/drivers/firmware/smccc/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+obj-$(CONFIG_HAVE_ARM_SMCCC_DISCOVERY) += smccc.o

diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c
new file mode 100644 (file)
index 0000000..de92a4b
--- /dev/null
+++ b/drivers/firmware/smccc/smccc.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ */
+
+#define pr_fmt(fmt) "smccc: " fmt
+
+#include <linux/init.h>
+#include <linux/arm-smccc.h>
+
+static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
+static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
+
+void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
+{
+       smccc_version = version;
+       smccc_conduit = conduit;
+}
+
+enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
+{
+       if (smccc_version < ARM_SMCCC_VERSION_1_1)
+               return SMCCC_CONDUIT_NONE;
+
+       return smccc_conduit;
+}

diff --git a/include/linux/psci.h b/include/linux/psci.h
index 29bd0671e5bb9db41c010a89acda01f4603c771c..14ad9b9ebcd66eeb9744c657ec54c046bc2ddcbb 100644 (file)
--- a/include/linux/psci.h
+++ b/include/linux/psci.h
@@ -30,8 +30,6 @@ struct psci_operations {
        int (*affinity_info)(unsigned long target_affinity,
                        unsigned long lowest_affinity_level);
        int (*migrate_info_type)(void);
-       enum arm_smccc_conduit conduit;
-       u32 smccc_version;
 };
 
 extern struct psci_operations psci_ops;