@@ -9,3 +9,9 @@ config IMX_SCU
This driver manages the IPC interface between host CPU and the
SCU firmware running on M4.
+
+config IMX_SCU_PD
+ bool "IMX SCU Power Domain driver"
+ depends on IMX_SCU
+ help
+ The System Controller Firmware (SCFW) based power domain driver.
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_IMX_SCU) += imx-scu.o misc.o
+obj-$(CONFIG_IMX_SCU) += imx-scu.o misc.o
+obj-$(CONFIG_IMX_SCU_PD) += scu-pd.o
new file mode 100644
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ * Dong Aisheng <aisheng.dong@nxp.com>
+ *
+ * Implementation of the SCU based Power Domains
+ */
+
+#define pr_fmt(fmt) "scu_pd: " fmt
+
+#include <linux/firmware/imx/sci.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+
+struct imx_sc_pm_domain {
+ struct generic_pm_domain pd;
+ u32 rsrc_id;
+};
+
+static struct imx_sc_ipc *pm_ipc_handle;
+
+/* SCU Power Mode Protocol definition */
+struct imx_sc_msg_req_set_resource_power_mode {
+ struct imx_sc_rpc_msg hdr;
+ u16 resource;
+ u8 mode;
+} __packed;
+
+static int imx_sc_pd_power(struct generic_pm_domain *domain, bool power_on)
+{
+ struct imx_sc_msg_req_set_resource_power_mode msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ struct imx_sc_pm_domain *pd;
+ int ret;
+
+ pd = container_of(domain, struct imx_sc_pm_domain, pd);
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = (uint8_t)IMX_SC_RPC_SVC_PM;
+ hdr->func = (uint8_t)IMX_SC_PM_FUNC_SET_RESOURCE_POWER_MODE;
+ hdr->size = 2;
+
+ msg.resource = pd->rsrc_id;
+ msg.mode = power_on ? IMX_SC_PM_PW_MODE_ON : IMX_SC_PM_PW_MODE_LP;
+
+ ret = imx_scu_call_rpc(pm_ipc_handle, &msg, true);
+ if (ret)
+ pr_err("failed to power %s resource %d ret %d\n",
+ power_on ? "up" : "off", pd->rsrc_id, ret);
+
+ return ret;
+}
+
+static int imx_sc_pd_power_on(struct generic_pm_domain *domain)
+{
+ return imx_sc_pd_power(domain, true);
+}
+
+static int imx_sc_pd_power_off(struct generic_pm_domain *domain)
+{
+ return imx_sc_pd_power(domain, false);
+}
+
+static struct generic_pm_domain *imx_sc_pm_add_one_domain(
+ struct device_node *np,
+ struct generic_pm_domain *genpd_parent)
+{
+ struct imx_sc_pm_domain *imx_sc_pd;
+ u32 rsrc_id;
+ int ret;
+
+ imx_sc_pd = kzalloc(sizeof(*imx_sc_pd), GFP_KERNEL);
+ if (!imx_sc_pd)
+ return ERR_PTR(-ENOMEM);
+
+ if (!of_property_read_u32(np, "reg", &rsrc_id)) {
+ if (rsrc_id >= IMX_SC_R_LAST) {
+ pr_warn("%pOF: invalid rsrc id %d found", np, rsrc_id);
+ ret = -EINVAL;
+ goto err;
+ }
+ imx_sc_pd->rsrc_id = rsrc_id;
+ imx_sc_pd->pd.power_off = imx_sc_pd_power_off;
+ imx_sc_pd->pd.power_on = imx_sc_pd_power_on;
+ } else {
+ imx_sc_pd->rsrc_id = IMX_SC_R_LAST;
+ }
+
+ imx_sc_pd->pd.name = np->name;
+
+ ret = pm_genpd_init(&imx_sc_pd->pd, NULL, true);
+ if (ret < 0)
+ goto err;
+
+ if (genpd_parent) {
+ ret = pm_genpd_add_subdomain(genpd_parent, &imx_sc_pd->pd);
+ if (ret)
+ goto err;
+ }
+
+ ret = of_genpd_add_provider_simple(np, &imx_sc_pd->pd);
+ if (!ret)
+ return &imx_sc_pd->pd;
+
+ pm_genpd_remove_subdomain(genpd_parent, &imx_sc_pd->pd);
+
+err:
+ pr_warn("failed to add PM domain %pOF: %d\n", np, ret);
+ kfree(imx_sc_pd);
+ return ERR_PTR(ret);
+}
+
+static void imx_sc_pm_add_pm_domains(struct device_node *parent,
+ struct generic_pm_domain *genpd_parent)
+{
+ struct generic_pm_domain *pd;
+ struct device_node *np;
+
+ for_each_child_of_node(parent, np) {
+ pd = imx_sc_pm_add_one_domain(np, genpd_parent);
+ if (!IS_ERR(pd))
+ imx_sc_pm_add_pm_domains(np, pd);
+ }
+}
+
+static int imx_sc_pd_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ ret = imx_scu_get_handle(&pm_ipc_handle);
+ if (ret)
+ return ret;
+
+ imx_sc_pm_add_pm_domains(np, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id imx_sc_pd_match[] = {
+ { .compatible = "fsl,imx8qxp-scu-pd", },
+ { /* sentinel */ }
+};
+
+static struct platform_driver imx_sc_pd_driver = {
+ .driver = {
+ .name = "imx-scu-pd",
+ .of_match_table = imx_sc_pd_match,
+ },
+ .probe = imx_sc_pd_probe,
+};
+builtin_platform_driver(imx_sc_pd_driver);
+
+MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
+MODULE_DESCRIPTION("IMX SCU Power Domain driver");
+MODULE_LICENSE("GPL v2");