[PATCH v2 3/3] drivers: meson: introduce secure power controller driver

[Alexey Romanov]

This patch adds Power controller driver support for Amlogic
A1 family using secure monitor calls. The power domains register
only can access in secure world.

Signed-off-by: Alexey Romanov <avromanov at sberdevices.ru>
---
 drivers/power/domain/Kconfig             |   7 +
 drivers/power/domain/Makefile            |   1 +
 drivers/power/domain/meson-secure-pwrc.c | 160 +++++++++++++++++++++++
 3 files changed, 168 insertions(+)
 create mode 100644 drivers/power/domain/meson-secure-pwrc.c

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index 7e1b8c072fa..411c210756a 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -68,6 +68,13 @@ config MESON_EE_POWER_DOMAIN
 	  Enable support for manipulating Amlogic Meson Everything-Else power
 	  domains.
 
+config MESON_SECURE_POWER_DOMAIN
+	bool "Enable Amlogic Secure power domain driver"
+	depends on POWER_DOMAIN && ARCH_MESON && MESON_A1
+	help
+	  Enable support for manipulating Amlogic Meson Secure power domains.
+	  Support for Amlogic A1 series.
+
 config SANDBOX_POWER_DOMAIN
 	bool "Enable the sandbox power domain test driver"
 	depends on POWER_DOMAIN && SANDBOX
diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index e6244776216..aa5a4ba57cd 100644
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_IMX8MP_HSIOMIX_BLKCTRL) += imx8mp-hsiomix.o
 obj-$(CONFIG_MTK_POWER_DOMAIN) += mtk-power-domain.o
 obj-$(CONFIG_MESON_GX_VPU_POWER_DOMAIN) += meson-gx-pwrc-vpu.o
 obj-$(CONFIG_MESON_EE_POWER_DOMAIN) += meson-ee-pwrc.o
+obj-$(CONFIG_MESON_SECURE_POWER_DOMAIN) += meson-secure-pwrc.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
 obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
diff --git a/drivers/power/domain/meson-secure-pwrc.c b/drivers/power/domain/meson-secure-pwrc.c
new file mode 100644
index 00000000000..f70f8e02423
--- /dev/null
+++ b/drivers/power/domain/meson-secure-pwrc.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2023 SberDevices, Inc.
+ * Author: Alexey Romanov <avromanov at sberdevices.ru>
+ */
+
+#include <dm.h>
+#include <asm/arch/sm.h>
+#include <power-domain.h>
+#include <power-domain-uclass.h>
+#include <dt-bindings/power/meson-a1-power.h>
+
+struct meson_secure_pwrc_domain_desc {
+	char *name;
+	size_t index;
+};
+
+struct meson_secure_pwrc_domain_data {
+	unsigned int count;
+	struct meson_secure_pwrc_domain_desc *domains;
+};
+
+struct meson_secure_pwrc_priv {
+	const struct meson_secure_pwrc_domain_data *data;
+};
+
+static int meson_secure_pwrc_on(struct power_domain *power_domain)
+{
+	struct meson_secure_pwrc_priv *priv = dev_get_priv(power_domain->dev);
+	struct meson_secure_pwrc_domain_desc *pwrc_domain;
+	int err;
+
+	pwrc_domain = &priv->data->domains[power_domain->id];
+
+	err = meson_sm_pwrdm_on(pwrc_domain->index);
+	if (err) {
+		pr_err("meson_sm_pwrdm_on() failed (%d)\n", err);
+		return err;
+	}
+
+	pr_debug("enable %s power domain\n", pwrc_domain->name);
+
+	return 0;
+}
+
+static int meson_secure_pwrc_off(struct power_domain *power_domain)
+{
+	struct meson_secure_pwrc_priv *priv = dev_get_priv(power_domain->dev);
+	struct meson_secure_pwrc_domain_desc *pwrc_domain;
+	int err;
+
+	pwrc_domain = &priv->data->domains[power_domain->id];
+
+	err = meson_sm_pwrdm_off(pwrc_domain->index);
+	if (err) {
+		pr_err("meson_sm_pwrdm_off() failed (%d)\n", err);
+		return err;
+	}
+
+	pr_debug("disable %s power domain\n", pwrc_domain->name);
+
+	return 0;
+}
+
+static int meson_secure_pwrc_of_xlate(struct power_domain *power_domain,
+				  struct ofnode_phandle_args *args)
+{
+	struct meson_secure_pwrc_priv *priv = dev_get_priv(power_domain->dev);
+	struct meson_secure_pwrc_domain_desc *pwrc_domain;
+
+	if (args->args_count < 1) {
+		pr_err("invalid args count: %d\n", args->args_count);
+		return -EINVAL;
+	}
+
+	power_domain->id = args->args[0];
+
+	if (power_domain->id >= priv->data->count) {
+		pr_err("domain with ID=%lu is invalid\n", power_domain->id);
+		return -EINVAL;
+	}
+
+	pwrc_domain = &priv->data->domains[power_domain->id];
+
+	if (!pwrc_domain->name) {
+		pr_err("domain with ID=%lu is invalid\n", power_domain->id);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define SEC_PD(__name)			\
+[PWRC_##__name##_ID] =			\
+{					\
+	.name = #__name,		\
+	.index = PWRC_##__name##_ID,	\
+}
+
+static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
+	SEC_PD(DSPA),
+	SEC_PD(DSPB),
+	SEC_PD(UART),
+	SEC_PD(DMC),
+	SEC_PD(I2C),
+	SEC_PD(PSRAM),
+	SEC_PD(ACODEC),
+	SEC_PD(AUDIO),
+	SEC_PD(OTP),
+	SEC_PD(DMA),
+	SEC_PD(SD_EMMC),
+	SEC_PD(RAMA),
+	SEC_PD(RAMB),
+	SEC_PD(IR),
+	SEC_PD(SPICC),
+	SEC_PD(SPIFC),
+	SEC_PD(USB),
+	SEC_PD(NIC),
+	SEC_PD(PDMIN),
+	SEC_PD(RSA),
+};
+
+struct power_domain_ops meson_secure_pwrc_ops = {
+	.on = meson_secure_pwrc_on,
+	.off = meson_secure_pwrc_off,
+	.of_xlate = meson_secure_pwrc_of_xlate,
+};
+
+static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
+	.count = ARRAY_SIZE(a1_pwrc_domains),
+	.domains = a1_pwrc_domains,
+};
+
+static const struct udevice_id meson_secure_pwrc_ids[] = {
+	{
+		.compatible = "amlogic,meson-a1-pwrc",
+		.data = (unsigned long)&meson_secure_a1_pwrc_data,
+	},
+	{ }
+};
+
+static int meson_secure_pwrc_probe(struct udevice *dev)
+{
+	struct meson_secure_pwrc_priv *priv = dev_get_priv(dev);
+
+	priv->data = (void *)dev_get_driver_data(dev);
+	if (!priv->data)
+		return -EINVAL;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(meson_secure_pwrc) = {
+	.name = "meson_secure_pwrc",
+	.id = UCLASS_POWER_DOMAIN,
+	.of_match = meson_secure_pwrc_ids,
+	.probe = meson_secure_pwrc_probe,
+	.ops = &meson_secure_pwrc_ops,
+	.priv_auto = sizeof(struct meson_secure_pwrc_priv),
+};
-- 
2.38.1