[PATCH v1 2/2] soc: imx: add Power Domain driver for i.MX8M(M|N|P)
Adrien Grassein
adrien.grassein at gmail.com
Fri Apr 2 17:45:06 BST 2021
Add code allowing to control the power domain of some
i.MX8 socs.
Signed-off-by: Adrien Grassein <adrien.grassein at gmail.com>
---
MAINTAINERS | 2 +
drivers/soc/imx/Kconfig | 7 +
drivers/soc/imx/Makefile | 1 +
drivers/soc/imx/imx8m_pm_domains.c | 233 +++++++++++++++++++++++++++++
include/soc/imx/imx_sip.h | 12 ++
5 files changed, 255 insertions(+)
create mode 100644 drivers/soc/imx/imx8m_pm_domains.c
create mode 100644 include/soc/imx/imx_sip.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 97536afca0e1..06e1568d003b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13014,9 +13014,11 @@ NXP i.MX 8M(M|N|P) POWER DOMAIN DRIVER
M: Adrien Grassein <adrien.grassein at gmail.com>
S: Maintained
F: Documentation/devicetree/bindings/power/fsl,imx-power-domain.yaml
+F: drivers/soc/imx/imx8m_pm_domains.c
F: include/dt-bindings/power/imx8mm-power.h
F: include/dt-bindings/power/imx8mn-power.h
F: include/dt-bindings/power/imx8mp-power.h
+F: include/soc/imx/imx_sip.h
NXP i.MX 8MQ DCSS DRIVER
M: Laurentiu Palcu <laurentiu.palcu at oss.nxp.com>
diff --git a/drivers/soc/imx/Kconfig b/drivers/soc/imx/Kconfig
index 05812f8ae734..02d93346fd4b 100644
--- a/drivers/soc/imx/Kconfig
+++ b/drivers/soc/imx/Kconfig
@@ -8,6 +8,13 @@ config IMX_GPCV2_PM_DOMAINS
select PM_GENERIC_DOMAINS
default y if SOC_IMX7D
+config IMX8M_PM_DOMAINS
+ bool "i.MX8M PM domains"
+ depends on ARCH_MXC || (COMPILE_TEST && OF)
+ depends on PM
+ select PM_GENERIC_DOMAINS
+ default y if SOC_IMX8M
+
config SOC_IMX8M
bool "i.MX8M SoC family support"
depends on ARCH_MXC || COMPILE_TEST
diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index 078dc918f4f3..7387239aecec 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_ARCH_MXC) += soc-imx.o
endif
obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
+obj-$(CONFIG_IMX8M_PM_DOMAINS) += imx8m_pm_domains.o
obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
diff --git a/drivers/soc/imx/imx8m_pm_domains.c b/drivers/soc/imx/imx8m_pm_domains.c
new file mode 100644
index 000000000000..3a039572b734
--- /dev/null
+++ b/drivers/soc/imx/imx8m_pm_domains.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/regulator/consumer.h>
+
+#include <soc/imx/imx_sip.h>
+
+#define MAX_CLK_NUM 6
+#define to_imx8m_pm_domain(_genpd) container_of(_genpd, struct imx8m_pm_domain, pd)
+
+struct imx8m_pm_domain {
+ struct device *dev;
+ struct generic_pm_domain pd;
+ u32 domain_index;
+ struct clk *clk[MAX_CLK_NUM];
+ unsigned int num_clks;
+ struct regulator *reg;
+};
+
+enum imx8m_pm_domain_state {
+ PD_STATE_OFF,
+ PD_STATE_ON,
+};
+
+static DEFINE_MUTEX(gpc_pd_mutex);
+
+static int imx8m_pd_power_on(struct generic_pm_domain *genpd)
+{
+ struct imx8m_pm_domain *domain = to_imx8m_pm_domain(genpd);
+ struct arm_smccc_res res;
+ int index, ret = 0;
+
+ /* power on the external supply */
+ if (!IS_ERR(domain->reg)) {
+ ret = regulator_enable(domain->reg);
+ if (ret) {
+ dev_warn(domain->dev, "failed to power up the reg%d\n", ret);
+ return ret;
+ }
+ }
+
+ /* enable the necessary clks needed by the power domain */
+ if (domain->num_clks) {
+ for (index = 0; index < domain->num_clks; index++)
+ clk_prepare_enable(domain->clk[index]);
+ }
+
+ mutex_lock(&gpc_pd_mutex);
+ arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_CONFIG_GPC_PM_DOMAIN, domain->domain_index,
+ PD_STATE_ON, 0, 0, 0, 0, &res);
+ mutex_unlock(&gpc_pd_mutex);
+
+ return 0;
+}
+
+static int imx8m_pd_power_off(struct generic_pm_domain *genpd)
+{
+ struct imx8m_pm_domain *domain = to_imx8m_pm_domain(genpd);
+ struct arm_smccc_res res;
+ int index, ret = 0;
+
+ mutex_lock(&gpc_pd_mutex);
+ arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_CONFIG_GPC_PM_DOMAIN, domain->domain_index,
+ PD_STATE_OFF, 0, 0, 0, 0, &res);
+ mutex_unlock(&gpc_pd_mutex);
+
+ /* power off the external supply */
+ if (!IS_ERR(domain->reg)) {
+ ret = regulator_disable(domain->reg);
+ if (ret) {
+ dev_warn(domain->dev, "failed to power off the reg%d\n", ret);
+ return ret;
+ }
+ }
+
+ /* disable clks when power domain is off */
+ if (domain->num_clks) {
+ for (index = 0; index < domain->num_clks; index++)
+ clk_disable_unprepare(domain->clk[index]);
+ }
+
+ return ret;
+};
+
+static int imx8m_pd_get_clocks(struct imx8m_pm_domain *domain)
+{
+ int i, ret;
+
+ for (i = 0; ; i++) {
+ struct clk *clk = of_clk_get(domain->dev->of_node, i);
+
+ if (IS_ERR(clk))
+ break;
+ if (i >= MAX_CLK_NUM) {
+ dev_err(domain->dev, "more than %d clocks\n",
+ MAX_CLK_NUM);
+ ret = -EINVAL;
+ goto clk_err;
+ }
+ domain->clk[i] = clk;
+ }
+ domain->num_clks = i;
+
+ return 0;
+
+clk_err:
+ while (i--)
+ clk_put(domain->clk[i]);
+
+ return ret;
+}
+
+static void imx8m_pd_put_clocks(struct imx8m_pm_domain *domain)
+{
+ int i;
+
+ for (i = domain->num_clks - 1; i >= 0; i--)
+ clk_put(domain->clk[i]);
+}
+
+static const struct of_device_id imx8m_pm_domain_ids[] = {
+ {.compatible = "fsl,imx8mm-pm-domain"},
+ {.compatible = "fsl,imx8mn-pm-domain"},
+ {.compatible = "fsl,imx8mn-pm-domain"},
+ {},
+};
+
+static int imx8m_pm_domain_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct imx8m_pm_domain *domain;
+ struct of_phandle_args parent, child;
+ int ret;
+
+ domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL);
+ if (!domain)
+ return -ENOMEM;
+
+ child.np = np;
+ domain->dev = dev;
+
+ ret = of_property_read_string(np, "domain-name", &domain->pd.name);
+ if (ret) {
+ dev_err(dev, "failed to get the domain name\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(np, "domain-index", &domain->domain_index);
+ if (ret) {
+ dev_err(dev, "failed to get the domain index\n");
+ return -EINVAL;
+ }
+
+ domain->reg = devm_regulator_get_optional(dev, "power");
+ if (IS_ERR(domain->reg)) {
+ if (PTR_ERR(domain->reg) != -ENODEV) {
+ if (PTR_ERR(domain->reg) != -EPROBE_DEFER)
+ dev_err(dev, "failed to get domain's regulator\n");
+ return PTR_ERR(domain->reg);
+ }
+ }
+
+ ret = imx8m_pd_get_clocks(domain);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "failed to get domain's clocks\n");
+ return ret;
+ }
+
+ domain->pd.power_off = imx8m_pd_power_off;
+ domain->pd.power_on = imx8m_pd_power_on;
+ if (of_property_read_bool(np, "fsl,active-wakeup"))
+ domain->pd.flags |= GENPD_FLAG_ACTIVE_WAKEUP;
+ if (of_property_read_bool(np, "fsl,rpm-always-on"))
+ domain->pd.flags |= GENPD_FLAG_RPM_ALWAYS_ON;
+
+ pm_genpd_init(&domain->pd, NULL, !(domain->pd.flags & GENPD_FLAG_RPM_ALWAYS_ON));
+
+ ret = of_genpd_add_provider_simple(np, &domain->pd);
+ if (ret) {
+ dev_err(dev, "failed to add the domain provider\n");
+ pm_genpd_remove(&domain->pd);
+ imx8m_pd_put_clocks(domain);
+ return ret;
+ }
+
+ /* add it as subdomain if necessary */
+ if (!of_parse_phandle_with_args(np, "power-domains",
+ "#power-domain-cells",
+ 0, &parent)) {
+ ret = of_genpd_add_subdomain(&parent, &child);
+ of_node_put(parent.np);
+
+ if (ret < 0) {
+ dev_dbg(dev, "failed to add the subdomain: %s: %d",
+ domain->pd.name, ret);
+ of_genpd_del_provider(np);
+ pm_genpd_remove(&domain->pd);
+ imx8m_pd_put_clocks(domain);
+ return driver_deferred_probe_check_state(dev);
+ }
+ }
+
+ return 0;
+}
+
+static struct platform_driver imx8m_pm_domain_driver = {
+ .driver = {
+ .name = "imx8m_pm_domain",
+ .owner = THIS_MODULE,
+ .of_match_table = imx8m_pm_domain_ids,
+ },
+ .probe = imx8m_pm_domain_probe,
+};
+module_platform_driver(imx8m_pm_domain_driver);
+
+MODULE_AUTHOR("NXP");
+/* Just for mainstreaming */
+MODULE_AUTHOR("Adrien Grassein <adrien.grassein at gmail.com>");
+MODULE_DESCRIPTION("NXP i.MX8M power domain driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/soc/imx/imx_sip.h b/include/soc/imx/imx_sip.h
new file mode 100644
index 000000000000..6b96b33c870e
--- /dev/null
+++ b/include/soc/imx/imx_sip.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 NXP
+ */
+
+#ifndef __IMX_SIP_H__
+#define __IMX_SIP_H__
+
+#define IMX_SIP_GPC 0xC2000000
+#define IMX_SIP_CONFIG_GPC_PM_DOMAIN 0x03
+
+#endif /* __IMX_SIP_H__ */
--
2.25.1
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