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Subject[PATCH] soc: imx: Add psci gpc support for i.MX8MQ
Date
From: Anson Huang <Anson.Huang@nxp.com>

Add i.MX8MQ PSCI GPC virtual driver support.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Bai Ping <ping.bai@nxp.com>
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
---
drivers/soc/imx/Makefile | 1 +
drivers/soc/imx/gpc-psci.c | 423 +++++++++++++++++++++++++++++++++++++++++++++
include/soc/imx/fsl_sip.h | 31 ++++
3 files changed, 455 insertions(+)
create mode 100644 drivers/soc/imx/gpc-psci.c
create mode 100644 include/soc/imx/fsl_sip.h

diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index 506a6f3..83a38ac 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
+obj-$(CONFIG_ARCH_MXC) += gpc-psci.o
diff --git a/drivers/soc/imx/gpc-psci.c b/drivers/soc/imx/gpc-psci.c
new file mode 100644
index 0000000..4f8fee9
--- /dev/null
+++ b/drivers/soc/imx/gpc-psci.c
@@ -0,0 +1,423 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 NXP.
+ *
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_domain.h>
+#include <soc/imx/fsl_sip.h>
+
+#define GPC_MAX_IRQS (4 * 32)
+
+struct imx_gpc_pm_domain {
+ const char name[30];
+ struct device *dev;
+ struct generic_pm_domain pd;
+ u32 gpc_domain_id;
+ struct clk **clks;
+ unsigned int num_clks;
+ struct regulator *reg;
+};
+
+enum imx_gpc_pm_domain_state {
+ GPC_PD_STATE_OFF,
+ GPC_PD_STATE_ON,
+};
+
+#define to_imx_gpc_pm_domain(_genpd) \
+ container_of(_genpd, struct imx_gpc_pm_domain, pd)
+
+static DEFINE_SPINLOCK(gpc_psci_lock);
+static DEFINE_MUTEX(gpc_pd_mutex);
+
+static void imx_gpc_psci_irq_unmask(struct irq_data *d)
+{
+ struct arm_smccc_res res;
+
+ spin_lock(&gpc_psci_lock);
+ arm_smccc_smc(FSL_SIP_GPC, FSL_SIP_CONFIG_GPC_UNMASK, d->hwirq,
+ 0, 0, 0, 0, 0, &res);
+ spin_unlock(&gpc_psci_lock);
+
+ irq_chip_unmask_parent(d);
+}
+
+static void imx_gpc_psci_irq_mask(struct irq_data *d)
+{
+ struct arm_smccc_res res;
+
+ spin_lock(&gpc_psci_lock);
+ arm_smccc_smc(FSL_SIP_GPC, FSL_SIP_CONFIG_GPC_MASK, d->hwirq,
+ 0, 0, 0, 0, 0, &res);
+ spin_unlock(&gpc_psci_lock);
+
+ irq_chip_mask_parent(d);
+}
+static int imx_gpc_psci_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+ struct arm_smccc_res res;
+
+ spin_lock(&gpc_psci_lock);
+ arm_smccc_smc(FSL_SIP_GPC, FSL_SIP_CONFIG_GPC_SET_WAKE, d->hwirq,
+ on, 0, 0, 0, 0, &res);
+ spin_unlock(&gpc_psci_lock);
+
+ return 0;
+}
+
+static int imx_gpc_psci_irq_set_affinity(struct irq_data *d,
+ const struct cpumask *dest,
+ bool force)
+{
+ /* parse the cpu of irq affinity */
+ struct arm_smccc_res res;
+ int cpu = cpumask_any_and(dest, cpu_online_mask);
+
+ irq_chip_set_affinity_parent(d, dest, force);
+
+ spin_lock(&gpc_psci_lock);
+ arm_smccc_smc(FSL_SIP_GPC, 0x4, d->hwirq,
+ cpu, 0, 0, 0, 0, &res);
+ spin_unlock(&gpc_psci_lock);
+
+ return 0;
+}
+
+static struct irq_chip imx_gpc_psci_chip = {
+ .name = "GPC-PSCI",
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_mask = imx_gpc_psci_irq_mask,
+ .irq_unmask = imx_gpc_psci_irq_unmask,
+ .irq_retrigger = irq_chip_retrigger_hierarchy,
+ .irq_set_wake = imx_gpc_psci_irq_set_wake,
+ .irq_set_affinity = imx_gpc_psci_irq_set_affinity,
+};
+
+static int imx_gpc_psci_domain_translate(struct irq_domain *d,
+ struct irq_fwspec *fwspec,
+ unsigned long *hwirq,
+ unsigned int *type)
+{
+ if (is_of_node(fwspec->fwnode)) {
+ if (fwspec->param_count != 3)
+ return -EINVAL;
+
+ /* No PPI should point to this domain */
+ if (fwspec->param[0] != 0)
+ return -EINVAL;
+
+ *hwirq = fwspec->param[1];
+ *type = fwspec->param[2];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int imx_gpc_psci_domain_alloc(struct irq_domain *domain,
+ unsigned int irq,
+ unsigned int nr_irqs, void *data)
+{
+ struct irq_fwspec *fwspec = data;
+ struct irq_fwspec parent_fwspec;
+ irq_hw_number_t hwirq;
+ int i;
+
+ if (fwspec->param_count != 3)
+ return -EINVAL; /* Not GIC compliant */
+ if (fwspec->param[0] != 0)
+ return -EINVAL; /* No PPI should point to this domain */
+
+ hwirq = fwspec->param[1];
+ if (hwirq >= GPC_MAX_IRQS)
+ return -EINVAL; /* Can't deal with this */
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
+ &imx_gpc_psci_chip, NULL);
+
+ parent_fwspec = *fwspec;
+ parent_fwspec.fwnode = domain->parent->fwnode;
+
+ return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
+ &parent_fwspec);
+}
+
+static const struct irq_domain_ops imx_gpc_psci_domain_ops = {
+ .translate = imx_gpc_psci_domain_translate,
+ .alloc = imx_gpc_psci_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+};
+
+static int __init imx_gpc_psci_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct irq_domain *parent_domain, *domain;
+
+ if (!parent) {
+ pr_err("%s: no parent, giving up\n", node->full_name);
+ return -ENODEV;
+ }
+
+ parent_domain = irq_find_host(parent);
+ if (!parent_domain) {
+ pr_err("%s: unable to obtain parent domain\n",
+ node->full_name);
+ return -ENXIO;
+ }
+
+ domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
+ node, &imx_gpc_psci_domain_ops,
+ NULL);
+ if (!domain)
+ return -ENOMEM;
+
+ return 0;
+}
+IRQCHIP_DECLARE(imx_gpc_psci, "fsl,imx8mq-gpc", imx_gpc_psci_init);
+
+static int imx_gpc_pd_power_on(struct generic_pm_domain *domain)
+{
+ struct imx_gpc_pm_domain *pd = to_imx_gpc_pm_domain(domain);
+ struct arm_smccc_res res;
+ int index, ret = 0;
+
+ /* power on the external supply */
+ if (pd->reg) {
+ ret = regulator_enable(pd->reg);
+ if (ret) {
+ dev_warn(pd->dev, "failed to power up the reg%d\n", ret);
+ return ret;
+ }
+ }
+
+ /* enable the necessary clks needed by the power domain */
+ if (pd->num_clks) {
+ for (index = 0; index < pd->num_clks; index++)
+ clk_prepare_enable(pd->clks[index]);
+ }
+
+ mutex_lock(&gpc_pd_mutex);
+ arm_smccc_smc(FSL_SIP_GPC, FSL_SIP_CONFIG_GPC_PM_DOMAIN,
+ pd->gpc_domain_id,
+ GPC_PD_STATE_ON, 0, 0, 0, 0, &res);
+ mutex_unlock(&gpc_pd_mutex);
+
+ return 0;
+}
+
+static int imx_gpc_pd_power_off(struct generic_pm_domain *domain)
+{
+ struct imx_gpc_pm_domain *pd = to_imx_gpc_pm_domain(domain);
+ struct arm_smccc_res res;
+ int index, ret = 0;
+
+ mutex_lock(&gpc_pd_mutex);
+ arm_smccc_smc(FSL_SIP_GPC, FSL_SIP_CONFIG_GPC_PM_DOMAIN,
+ pd->gpc_domain_id, GPC_PD_STATE_OFF,
+ 0, 0, 0, 0, &res);
+ mutex_unlock(&gpc_pd_mutex);
+
+ /* power off the external supply */
+ if (pd->reg) {
+ ret = regulator_disable(pd->reg);
+ if (ret) {
+ dev_warn(pd->dev, "failed to power off the reg%d\n", ret);
+ return ret;
+ }
+ }
+
+ /* disable the necessary clks when power domain on finished */
+ if (pd->num_clks) {
+ for (index = 0; index < pd->num_clks; index++)
+ clk_disable_unprepare(pd->clks[index]);
+ }
+
+ return ret;
+};
+
+static int imx8m_pd_clk_init(struct device_node *np,
+ struct imx_gpc_pm_domain *domain)
+{
+ struct property *pp;
+ struct clk **clks;
+ int index;
+
+ pp = of_find_property(np, "clocks", NULL);
+ if (pp)
+ domain->num_clks = pp->length / 8;
+ else
+ domain->num_clks = 0;
+
+ if (domain->num_clks) {
+ clks = kcalloc(domain->num_clks, sizeof(*clks), GFP_KERNEL);
+ if (!clks) {
+ domain->num_clks = 0;
+ domain->clks = NULL;
+ return -ENOMEM;
+ }
+
+ domain->clks = clks;
+ }
+
+ for (index = 0; index < domain->num_clks; index++) {
+ clks[index] = of_clk_get(np, index);
+ if (IS_ERR(clks[index])) {
+ for (index = 0; index < domain->num_clks; index++) {
+ if (!IS_ERR(clks[index]))
+ clk_put(clks[index]);
+ }
+
+ domain->num_clks = 0;
+ domain->clks = NULL;
+ kfree(clks);
+ pr_warn("imx8m domain clock init failed\n");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static int imx8m_add_subdomain(struct device_node *parent,
+ struct generic_pm_domain *parent_pd)
+{
+ struct device_node *child_node;
+ struct imx_gpc_pm_domain *child_domain;
+ int ret = 0;
+
+ /* add each of the child domain of parent */
+ for_each_child_of_node(parent, child_node) {
+ if (!of_device_is_available(child_node))
+ continue;
+
+ child_domain = kzalloc(sizeof(*child_domain), GFP_KERNEL);
+ if (!child_domain)
+ return -ENOMEM;
+
+ ret = of_property_read_string(child_node, "domain-name",
+ &child_domain->pd.name);
+ if (ret)
+ goto exit;
+
+ ret = of_property_read_u32(child_node, "domain-id",
+ &child_domain->gpc_domain_id);
+ if (ret)
+ goto exit;
+
+ child_domain->pd.power_off = imx_gpc_pd_power_off;
+ child_domain->pd.power_on = imx_gpc_pd_power_on;
+ /* no reg for subdomains */
+ child_domain->reg = NULL;
+
+ imx8m_pd_clk_init(child_node, child_domain);
+
+ /* power domains as off at boot */
+ pm_genpd_init(&child_domain->pd, NULL, true);
+
+ /* add subdomain of parent power domain */
+ pm_genpd_add_subdomain(parent_pd, &child_domain->pd);
+
+ ret = of_genpd_add_provider_simple(child_node,
+ &child_domain->pd);
+ if (ret)
+ pr_err("failed to add subdomain\n");
+ }
+
+ return 0;
+exit:
+ kfree(child_domain);
+ return ret;
+};
+
+static int imx_gpc_pm_domain_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct imx_gpc_pm_domain *imx_pm_domain;
+ int ret = 0;
+
+ if (!np) {
+ dev_err(dev, "power domain device tree node not found\n");
+ return -ENODEV;
+ }
+
+ imx_pm_domain = devm_kzalloc(dev, sizeof(*imx_pm_domain), GFP_KERNEL);
+ if (!imx_pm_domain)
+ return -ENOMEM;
+ imx_pm_domain->dev = dev;
+
+ ret = of_property_read_string(np, "domain-name",
+ &imx_pm_domain->pd.name);
+ if (ret) {
+ dev_err(dev, "get domain name failed\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(np, "domain-id",
+ &imx_pm_domain->gpc_domain_id);
+ if (ret) {
+ dev_err(dev, "get domain id failed\n");
+ return -EINVAL;
+ }
+
+ imx_pm_domain->reg = devm_regulator_get_optional(dev, "power");
+ if (IS_ERR(imx_pm_domain->reg)) {
+ if (PTR_ERR(imx_pm_domain->reg) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ imx_pm_domain->reg = NULL;
+ }
+
+ imx8m_pd_clk_init(np, imx_pm_domain);
+
+ imx_pm_domain->pd.power_off = imx_gpc_pd_power_off;
+ imx_pm_domain->pd.power_on = imx_gpc_pd_power_on;
+ /* all power domains as off at boot */
+ pm_genpd_init(&imx_pm_domain->pd, NULL, true);
+
+ ret = of_genpd_add_provider_simple(np,
+ &imx_pm_domain->pd);
+
+ /* add subdomain */
+ ret = imx8m_add_subdomain(np, &imx_pm_domain->pd);
+ if (ret)
+ dev_warn(dev, "please check the child power domain init\n");
+
+ return 0;
+}
+
+static const struct of_device_id imx_gpc_pm_domain_ids[] = {
+ {.compatible = "fsl,imx8mq-pm-domain"},
+ {.compatible = "fsl,imx8mm-pm-domain"},
+ {},
+};
+
+static struct platform_driver imx_gpc_pm_domain_driver = {
+ .driver = {
+ .name = "imx8m_gpc_pm_domain",
+ .owner = THIS_MODULE,
+ .of_match_table = imx_gpc_pm_domain_ids,
+ },
+ .probe = imx_gpc_pm_domain_probe,
+};
+
+module_platform_driver(imx_gpc_pm_domain_driver);
+
+MODULE_AUTHOR("NXP");
+MODULE_DESCRIPTION("NXP i.MX8M GPC power domain driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/soc/imx/fsl_sip.h b/include/soc/imx/fsl_sip.h
new file mode 100644
index 0000000..c3867a2
--- /dev/null
+++ b/include/soc/imx/fsl_sip.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017 NXP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __SOC_FSL_SIP_H
+#define __SOC_FSL_SIP_H
+
+#define FSL_SIP_GPC 0xC2000000
+#define FSL_SIP_CONFIG_GPC_MASK 0x00
+#define FSL_SIP_CONFIG_GPC_UNMASK 0x01
+#define FSL_SIP_CONFIG_GPC_SET_WAKE 0x02
+#define FSL_SIP_CONFIG_GPC_PM_DOMAIN 0x03
+
+#define IMX8MQ_PD_MIPI 0
+#define IMX8MQ_PD_PCIE1 1
+#define IMX8MQ_PD_OTG1 2
+#define IMX8MQ_PD_OTG2 3
+#define IMX8MQ_PD_GPU 4
+#define IMX8MQ_PD_VPU 5
+#define IMX8MQ_PD_HDMI 6
+#define IMX8MQ_PD_DISP 7
+#define IMX8MQ_PD_MIPI_CSI1 8
+#define IMX8MQ_PD_MIPI_CSI2 9
+#define IMX8MQ_PD_PCIE2 10
+
+#endif
--
2.7.4
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