firmware: arm_scpi: Move power-domain driver to the pmdomain dir

To simplify with maintenance let's move the Arm SCPI power-domain driver
to the new pmdomain directory. Note this is different from and precedes
the new Arm SCMI protocol.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20231123120847.2825444-2-sudeep.holla@arm.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

3 files changed, 0 insertions, 167 deletions

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 4a98a859d44d..afeb050ae1b4 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -28,15 +28,6 @@ config ARM_SCPI_PROTOCOL
 	  This protocol library provides interface for all the client drivers
 	  making use of the features offered by the SCP.
 
-config ARM_SCPI_POWER_DOMAIN
-	tristate "SCPI power domain driver"
-	depends on ARM_SCPI_PROTOCOL || (COMPILE_TEST && OF)
-	default y
-	select PM_GENERIC_DOMAINS if PM
-	help
-	  This enables support for the SCPI power domains which can be
-	  enabled or disabled via the SCP firmware
-
 config ARM_SDE_INTERFACE
 	bool "ARM Software Delegated Exception Interface (SDEI)"
 	depends on ARM64
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 5f9dab82e1a0..944833702ebd 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -3,7 +3,6 @@
 # Makefile for the linux kernel.
 #
 obj-$(CONFIG_ARM_SCPI_PROTOCOL)	+= arm_scpi.o
-obj-$(CONFIG_ARM_SCPI_POWER_DOMAIN) += scpi_pm_domain.o
 obj-$(CONFIG_ARM_SDE_INTERFACE)	+= arm_sdei.o
 obj-$(CONFIG_DMI)		+= dmi_scan.o
 obj-$(CONFIG_DMI_SYSFS)		+= dmi-sysfs.o
diff --git a/drivers/firmware/scpi_pm_domain.c b/drivers/firmware/scpi_pm_domain.c
deleted file mode 100644
index 2231e6dd2070..000000000000
--- a/drivers/firmware/scpi_pm_domain.c
+++ /dev/null
@@ -1,157 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * SCPI Generic power domain support.
- *
- * Copyright (C) 2016 ARM Ltd.
- */
-
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pm_domain.h>
-#include <linux/scpi_protocol.h>
-
-struct scpi_pm_domain {
-	struct generic_pm_domain genpd;
-	struct scpi_ops *ops;
-	u32 domain;
-};
-
-/*
- * These device power state values are not well-defined in the specification.
- * In case, different implementations use different values, we can make these
- * specific to compatibles rather than getting these values from device tree.
- */
-enum scpi_power_domain_state {
-	SCPI_PD_STATE_ON = 0,
-	SCPI_PD_STATE_OFF = 3,
-};
-
-#define to_scpi_pd(gpd) container_of(gpd, struct scpi_pm_domain, genpd)
-
-static int scpi_pd_power(struct scpi_pm_domain *pd, bool power_on)
-{
-	int ret;
-	enum scpi_power_domain_state state;
-
-	if (power_on)
-		state = SCPI_PD_STATE_ON;
-	else
-		state = SCPI_PD_STATE_OFF;
-
-	ret = pd->ops->device_set_power_state(pd->domain, state);
-	if (ret)
-		return ret;
-
-	return !(state == pd->ops->device_get_power_state(pd->domain));
-}
-
-static int scpi_pd_power_on(struct generic_pm_domain *domain)
-{
-	struct scpi_pm_domain *pd = to_scpi_pd(domain);
-
-	return scpi_pd_power(pd, true);
-}
-
-static int scpi_pd_power_off(struct generic_pm_domain *domain)
-{
-	struct scpi_pm_domain *pd = to_scpi_pd(domain);
-
-	return scpi_pd_power(pd, false);
-}
-
-static int scpi_pm_domain_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct scpi_pm_domain *scpi_pd;
-	struct genpd_onecell_data *scpi_pd_data;
-	struct generic_pm_domain **domains;
-	struct scpi_ops *scpi_ops;
-	int ret, num_domains, i;
-
-	scpi_ops = get_scpi_ops();
-	if (!scpi_ops)
-		return -EPROBE_DEFER;
-
-	if (!np) {
-		dev_err(dev, "device tree node not found\n");
-		return -ENODEV;
-	}
-
-	if (!scpi_ops->device_set_power_state ||
-	    !scpi_ops->device_get_power_state) {
-		dev_err(dev, "power domains not supported in the firmware\n");
-		return -ENODEV;
-	}
-
-	ret = of_property_read_u32(np, "num-domains", &num_domains);
-	if (ret) {
-		dev_err(dev, "number of domains not found\n");
-		return -EINVAL;
-	}
-
-	scpi_pd = devm_kcalloc(dev, num_domains, sizeof(*scpi_pd), GFP_KERNEL);
-	if (!scpi_pd)
-		return -ENOMEM;
-
-	scpi_pd_data = devm_kzalloc(dev, sizeof(*scpi_pd_data), GFP_KERNEL);
-	if (!scpi_pd_data)
-		return -ENOMEM;
-
-	domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
-	if (!domains)
-		return -ENOMEM;
-
-	for (i = 0; i < num_domains; i++, scpi_pd++) {
-		domains[i] = &scpi_pd->genpd;
-
-		scpi_pd->domain = i;
-		scpi_pd->ops = scpi_ops;
-		scpi_pd->genpd.name = devm_kasprintf(dev, GFP_KERNEL,
-						     "%pOFn.%d", np, i);
-		if (!scpi_pd->genpd.name) {
-			dev_err(dev, "Failed to allocate genpd name:%pOFn.%d\n",
-				np, i);
-			continue;
-		}
-		scpi_pd->genpd.power_off = scpi_pd_power_off;
-		scpi_pd->genpd.power_on = scpi_pd_power_on;
-
-		/*
-		 * Treat all power domains as off at boot.
-		 *
-		 * The SCP firmware itself may have switched on some domains,
-		 * but for reference counting purpose, keep it this way.
-		 */
-		pm_genpd_init(&scpi_pd->genpd, NULL, true);
-	}
-
-	scpi_pd_data->domains = domains;
-	scpi_pd_data->num_domains = num_domains;
-
-	of_genpd_add_provider_onecell(np, scpi_pd_data);
-
-	return 0;
-}
-
-static const struct of_device_id scpi_power_domain_ids[] = {
-	{ .compatible = "arm,scpi-power-domains", },
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, scpi_power_domain_ids);
-
-static struct platform_driver scpi_power_domain_driver = {
-	.driver	= {
-		.name = "scpi_power_domain",
-		.of_match_table = scpi_power_domain_ids,
-	},
-	.probe = scpi_pm_domain_probe,
-};
-module_platform_driver(scpi_power_domain_driver);
-
-MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
-MODULE_DESCRIPTION("ARM SCPI power domain driver");
-MODULE_LICENSE("GPL v2");