[PATCH v6 3/3] firmware: QCOM_SCM: Allow qcom_scm driver to be loadable as a permenent module

John Stultz
2020-11-06T04:27:24Z

Allow the qcom_scm driver to be loadable as a permenent module.

This still uses the "depends on QCOM_SCM || !QCOM_SCM" bit to
ensure that drivers that call into the qcom_scm driver are
also built as modules. While not ideal in some cases its the
only safe way I can find to avoid build errors without having
those drivers select QCOM_SCM and have to force it on (as
QCOM_SCM=n can be valid for those drivers).

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Maulik Shah <mkshah@codeaurora.org>
Cc: Lina Iyer <ilina@codeaurora.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: Todd Kjos <tkjos@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: iommu@lists.linux-foundation.org
Cc: linux-gpio@vger.kernel.org
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
v3:
* Fix __arm_smccc_smc build issue reported by
kernel test robot <lkp@intel.com>
v4:
* Add "depends on QCOM_SCM || !QCOM_SCM" bit to ath10k
config that requires it.
v5:
* Fix QCOM_QCM typo in Kconfig, it should be QCOM_SCM
---
drivers/firmware/Kconfig | 4 ++--
drivers/firmware/Makefile | 3 ++-
drivers/firmware/qcom_scm.c | 4 ++++
drivers/iommu/Kconfig | 2 ++
drivers/net/wireless/ath/ath10k/Kconfig | 1 +
5 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 3315e3c215864..5e369928bc567 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -235,8 +235,8 @@ config INTEL_STRATIX10_RSU
Say Y here if you want Intel RSU support.

config QCOM_SCM
- bool
- depends on ARM || ARM64
+ tristate "Qcom SCM driver"
+ depends on (ARM && HAVE_ARM_SMCCC) || ARM64
select RESET_CONTROLLER

config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 5e013b6a3692e..523173cbff335 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -17,7 +17,8 @@ obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o
obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o
-obj-$(CONFIG_QCOM_SCM) += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o
+obj-$(CONFIG_QCOM_SCM) += qcom-scm.o
+qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o
obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o
obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o
obj-$(CONFIG_TURRIS_MOX_RWTM) += turris-mox-rwtm.o
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 7be48c1bec96d..6f431b73e617d 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1280,6 +1280,7 @@ static const struct of_device_id qcom_scm_dt_match[] = {
{ .compatible = "qcom,scm" },
{}
};
+MODULE_DEVICE_TABLE(of, qcom_scm_dt_match);

static struct platform_driver qcom_scm_driver = {
.driver = {
@@ -1295,3 +1296,6 @@ static int __init qcom_scm_init(void)
return platform_driver_register(&qcom_scm_driver);
}
subsys_initcall(qcom_scm_init);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. SCM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 04878caf6da49..c64d7a2b65134 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -248,6 +248,7 @@ config SPAPR_TCE_IOMMU
config ARM_SMMU
tristate "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
+ depends on QCOM_SCM || !QCOM_SCM #if QCOM_SCM=m this can't be =y
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
@@ -375,6 +376,7 @@ config QCOM_IOMMU
# Note: iommu drivers cannot (yet?) be built as modules
bool "Qualcomm IOMMU Support"
depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
+ depends on QCOM_SCM=y
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU
diff --git a/drivers/net/wireless/ath/ath10k/Kconfig b/drivers/net/wireless/ath/ath10k/Kconfig
index 40f91bc8514d8..741289e385d59 100644
--- a/drivers/net/wireless/ath/ath10k/Kconfig
+++ b/drivers/net/wireless/ath/ath10k/Kconfig
@@ -44,6 +44,7 @@ config ATH10K_SNOC
tristate "Qualcomm ath10k SNOC support"
depends on ATH10K
depends on ARCH_QCOM || COMPILE_TEST
+ depends on QCOM_SCM || !QCOM_SCM #if QCOM_SCM=m this can't be =y
select QCOM_QMI_HELPERS
help
This module adds support for integrated WCN3990 chip connected
--
2.17.1