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Message-ID: <04d0cf9a-dca8-4952-88fd-f7979a22602f@quicinc.com>
Date: Thu, 1 Aug 2024 11:46:03 -0700
From: Nikunj Kela <quic_nkela@...cinc.com>
To: Cristian Marussi <cristian.marussi@....com>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <arm-scmi@...r.kernel.org>
CC: <sudeep.holla@....com>, <james.quinlan@...adcom.com>,
        <f.fainelli@...il.com>, <vincent.guittot@...aro.org>,
        <etienne.carriere@...com>, <peng.fan@....nxp.com>,
        <michal.simek@....com>, <quic_sibis@...cinc.com>, <ptosi@...gle.com>,
        <dan.carpenter@...aro.org>, <souvik.chakravarty@....com>,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v3 6/9] firmware: arm_scmi: Make SMC transport a
 standalone driver


On 7/30/2024 6:33 AM, Cristian Marussi wrote:
> Make SCMI SMC transport a standalone driver that can be optionally
> loaded as a module.
>
> CC: Peng Fan <peng.fan@....com>
> CC: Nikunj Kela <quic_nkela@...cinc.com>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---

Tested-by: Nikunj Kela <quic_nkela@...cinc.com>

Tested this series on Qualcomm SA8255p(to be upstreamed) platform that
uses Qualcomm SMC transport.

> v2 --> v3
> - fixed spacing in Kconfig and Copyright
> - use new params in DEFINE_SCMI_TRANSPORT_DRIVER
> v1 --> v2
> - make scmi_smc_desc static
> ---
>  drivers/firmware/arm_scmi/Kconfig             |  4 ++-
>  drivers/firmware/arm_scmi/Makefile            |  2 +-
>  drivers/firmware/arm_scmi/common.h            |  3 --
>  drivers/firmware/arm_scmi/driver.c            |  5 ---
>  .../arm_scmi/{smc.c => scmi_transport_smc.c}  | 32 +++++++++++++++----
>  5 files changed, 30 insertions(+), 16 deletions(-)
>  rename drivers/firmware/arm_scmi/{smc.c => scmi_transport_smc.c} (88%)
>
> diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
> index f03875169215..f634c5af1912 100644
> --- a/drivers/firmware/arm_scmi/Kconfig
> +++ b/drivers/firmware/arm_scmi/Kconfig
> @@ -102,7 +102,7 @@ config ARM_SCMI_TRANSPORT_OPTEE
>  	  transport based on OP-TEE SCMI service, answer Y.
>  
>  config ARM_SCMI_TRANSPORT_SMC
> -	bool "SCMI transport based on SMC"
> +	tristate "SCMI transport based on SMC"
>  	depends on HAVE_ARM_SMCCC_DISCOVERY
>  	select ARM_SCMI_HAVE_TRANSPORT
>  	select ARM_SCMI_HAVE_SHMEM
> @@ -112,6 +112,8 @@ config ARM_SCMI_TRANSPORT_SMC
>  
>  	  If you want the ARM SCMI PROTOCOL stack to include support for a
>  	  transport based on SMC, answer Y.
> +	  This driver can also be built as a module. If so, the module
> +	  will be called scmi_transport_smc.
>  
>  config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE
>  	bool "Enable atomic mode support for SCMI SMC transport"
> diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
> index 121612d75f0b..6868a47fa4ab 100644
> --- a/drivers/firmware/arm_scmi/Makefile
> +++ b/drivers/firmware/arm_scmi/Makefile
> @@ -5,7 +5,6 @@ scmi-core-objs := $(scmi-bus-y)
>  scmi-driver-y = driver.o notify.o
>  scmi-driver-$(CONFIG_ARM_SCMI_RAW_MODE_SUPPORT) += raw_mode.o
>  scmi-transport-$(CONFIG_ARM_SCMI_HAVE_SHMEM) = shmem.o
> -scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_SMC) += smc.o
>  scmi-transport-$(CONFIG_ARM_SCMI_HAVE_MSG) += msg.o
>  scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_VIRTIO) += virtio.o
>  scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_OPTEE) += optee.o
> @@ -13,6 +12,7 @@ scmi-protocols-y := base.o clock.o perf.o power.o reset.o sensors.o system.o vol
>  scmi-protocols-y += pinctrl.o
>  scmi-module-objs := $(scmi-driver-y) $(scmi-protocols-y) $(scmi-transport-y)
>  
> +obj-$(CONFIG_ARM_SCMI_TRANSPORT_SMC) += scmi_transport_smc.o
>  obj-$(CONFIG_ARM_SCMI_TRANSPORT_MAILBOX) += scmi_transport_mailbox.o
>  
>  obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o
> diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
> index abaf7ce6fbab..f44763bfec16 100644
> --- a/drivers/firmware/arm_scmi/common.h
> +++ b/drivers/firmware/arm_scmi/common.h
> @@ -286,9 +286,6 @@ int scmi_xfer_raw_inflight_register(const struct scmi_handle *handle,
>  int scmi_xfer_raw_wait_for_message_response(struct scmi_chan_info *cinfo,
>  					    struct scmi_xfer *xfer,
>  					    unsigned int timeout_ms);
> -#ifdef CONFIG_ARM_SCMI_TRANSPORT_SMC
> -extern const struct scmi_desc scmi_smc_desc;
> -#endif
>  #ifdef CONFIG_ARM_SCMI_TRANSPORT_VIRTIO
>  extern const struct scmi_desc scmi_virtio_desc;
>  #endif
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 9d869ab2d003..c4d0195f0fdb 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -3254,11 +3254,6 @@ static const struct of_device_id scmi_of_match[] = {
>  #ifdef CONFIG_ARM_SCMI_TRANSPORT_OPTEE
>  	{ .compatible = "linaro,scmi-optee", .data = &scmi_optee_desc },
>  #endif
> -#ifdef CONFIG_ARM_SCMI_TRANSPORT_SMC
> -	{ .compatible = "arm,scmi-smc", .data = &scmi_smc_desc},
> -	{ .compatible = "arm,scmi-smc-param", .data = &scmi_smc_desc},
> -	{ .compatible = "qcom,scmi-smc", .data = &scmi_smc_desc},
> -#endif
>  #ifdef CONFIG_ARM_SCMI_TRANSPORT_VIRTIO
>  	{ .compatible = "arm,scmi-virtio", .data = &scmi_virtio_desc},
>  #endif
> diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/scmi_transport_smc.c
> similarity index 88%
> rename from drivers/firmware/arm_scmi/smc.c
> rename to drivers/firmware/arm_scmi/scmi_transport_smc.c
> index 4cb86386c490..1c203a68acd4 100644
> --- a/drivers/firmware/arm_scmi/smc.c
> +++ b/drivers/firmware/arm_scmi/scmi_transport_smc.c
> @@ -16,6 +16,7 @@
>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/limits.h>
> +#include <linux/platform_device.h>
>  #include <linux/processor.h>
>  #include <linux/slab.h>
>  
> @@ -69,12 +70,14 @@ struct scmi_smc {
>  	unsigned long cap_id;
>  };
>  
> +static struct scmi_transport_core_operations *core;
> +
>  static irqreturn_t smc_msg_done_isr(int irq, void *data)
>  {
>  	struct scmi_smc *scmi_info = data;
>  
> -	scmi_rx_callback(scmi_info->cinfo,
> -			 scmi_shmem_ops.read_header(scmi_info->shmem), NULL);
> +	core->rx_callback(scmi_info->cinfo,
> +			  core->shmem->read_header(scmi_info->shmem), NULL);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -141,7 +144,7 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
>  	if (!scmi_info)
>  		return -ENOMEM;
>  
> -	scmi_info->shmem = scmi_shmem_ops.setup_iomap(cinfo, dev, tx, &res);
> +	scmi_info->shmem = core->shmem->setup_iomap(cinfo, dev, tx, &res);
>  	if (IS_ERR(scmi_info->shmem))
>  		return PTR_ERR(scmi_info->shmem);
>  
> @@ -226,7 +229,7 @@ static int smc_send_message(struct scmi_chan_info *cinfo,
>  	 */
>  	smc_channel_lock_acquire(scmi_info, xfer);
>  
> -	scmi_shmem_ops.tx_prepare(scmi_info->shmem, xfer, cinfo);
> +	core->shmem->tx_prepare(scmi_info->shmem, xfer, cinfo);
>  
>  	if (scmi_info->cap_id != ULONG_MAX)
>  		arm_smccc_1_1_invoke(scmi_info->func_id, scmi_info->cap_id, 0,
> @@ -250,7 +253,7 @@ static void smc_fetch_response(struct scmi_chan_info *cinfo,
>  {
>  	struct scmi_smc *scmi_info = cinfo->transport_info;
>  
> -	scmi_shmem_ops.fetch_response(scmi_info->shmem, xfer);
> +	core->shmem->fetch_response(scmi_info->shmem, xfer);
>  }
>  
>  static void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret,
> @@ -270,7 +273,7 @@ static const struct scmi_transport_ops scmi_smc_ops = {
>  	.fetch_response = smc_fetch_response,
>  };
>  
> -const struct scmi_desc scmi_smc_desc = {
> +static const struct scmi_desc scmi_smc_desc = {
>  	.ops = &scmi_smc_ops,
>  	.max_rx_timeout_ms = 30,
>  	.max_msg = 20,
> @@ -286,3 +289,20 @@ const struct scmi_desc scmi_smc_desc = {
>  	.sync_cmds_completed_on_ret = true,
>  	.atomic_enabled = IS_ENABLED(CONFIG_ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE),
>  };
> +
> +static const struct of_device_id scmi_of_match[] = {
> +	{ .compatible = "arm,scmi-smc" },
> +	{ .compatible = "arm,scmi-smc-param" },
> +	{ .compatible = "qcom,scmi-smc" },
> +	{ /* Sentinel */ },
> +};
> +
> +DEFINE_SCMI_TRANSPORT_DRIVER(scmi_smc, scmi_smc_driver, scmi_smc_desc,
> +			     scmi_of_match, core);
> +module_platform_driver(scmi_smc_driver);
> +
> +MODULE_ALIAS("scmi-transport-smc");
> +MODULE_AUTHOR("Peng Fan <peng.fan@....com>");
> +MODULE_AUTHOR("Nikunj Kela <quic_nkela@...cinc.com>");
> +MODULE_DESCRIPTION("SCMI SMC Transport driver");
> +MODULE_LICENSE("GPL");

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