Add support for the Amlogic Secure Power controller. In A1/C1 series, power
control registers are in secure domain, and should be accessed by smc.
Signed-off-by: Jianxin Pan <jianxin.pan@xxxxxxxxxxx>
Signed-off-by: Zhiqiang Liang <zhiqiang.liang@xxxxxxxxxxx>
---
drivers/soc/amlogic/Kconfig | 13 +++
drivers/soc/amlogic/Makefile | 1 +
drivers/soc/amlogic/meson-secure-pwrc.c | 182 ++++++++++++++++++++++++++++++++
3 files changed, 196 insertions(+)
create mode 100644 drivers/soc/amlogic/meson-secure-pwrc.c
diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
index bc2c912..6cb06e7 100644
--- a/drivers/soc/amlogic/Kconfig
+++ b/drivers/soc/amlogic/Kconfig
@@ -48,6 +48,19 @@ config MESON_EE_PM_DOMAINS
Say yes to expose Amlogic Meson Everything-Else Power Domains as
Generic Power Domains.
+config MESON_SECURE_PM_DOMAINS
+ bool "Amlogic Meson Secure Power Domains driver"
+ depends on ARCH_MESON || COMPILE_TEST
+ depends on PM && OF
+ depends on HAVE_ARM_SMCCC
+ default ARCH_MESON
+ select PM_GENERIC_DOMAINS
+ select PM_GENERIC_DOMAINS_OF
+ help
+ Support for the power controller on Amlogic A1/C1 series.
+ Say yes to expose Amlogic Meson Secure Power Domains as Generic
+ Power Domains.
+
config MESON_MX_SOCINFO
bool "Amlogic Meson MX SoC Information driver"
depends on ARCH_MESON || COMPILE_TEST
diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
index de79d044..7b8c5d3 100644
--- a/drivers/soc/amlogic/Makefile
+++ b/drivers/soc/amlogic/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o
obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
obj-$(CONFIG_MESON_EE_PM_DOMAINS) += meson-ee-pwrc.o
+obj-$(CONFIG_MESON_SECURE_PM_DOMAINS) += meson-secure-pwrc.o
diff --git a/drivers/soc/amlogic/meson-secure-pwrc.c b/drivers/soc/amlogic/meson-secure-pwrc.c
new file mode 100644
index 00000000..00c7232
--- /dev/null
+++ b/drivers/soc/amlogic/meson-secure-pwrc.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 Amlogic, Inc.
+ * Author: Jianxin Pan <jianxin.pan@xxxxxxxxxxx>
+ */
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <dt-bindings/power/meson-a1-power.h>
+#include <linux/arm-smccc.h>
+
+#define PWRC_ON 1
+#define PWRC_OFF 0
+#define SMC_PWRC_SET 0x82000093
+#define SMC_PWRC_GET 0x82000095
+
+struct meson_secure_pwrc_domain {
+ struct generic_pm_domain base;
+ unsigned int index;
+};
+
+struct meson_secure_pwrc {
+ struct meson_secure_pwrc_domain *domains;
+ struct genpd_onecell_data xlate;
+};
+
+struct meson_secure_pwrc_domain_desc {
+ unsigned int index;
+ unsigned int flags;
+ char *name;
+ bool (*get_power)(struct meson_secure_pwrc_domain *pwrc_domain);
+};
+
+struct meson_secure_pwrc_domain_data {
+ unsigned int count;
+ struct meson_secure_pwrc_domain_desc *domains;
+};
+
+static bool pwrc_secure_get_power(struct meson_secure_pwrc_domain *pwrc_domain)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(SMC_PWRC_GET, pwrc_domain->index, 0,
+ 0, 0, 0, 0, 0, &res);
+
+ return res.a0 & 0x1;
+}
+
+static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
+{
+ struct arm_smccc_res res;
+ struct meson_secure_pwrc_domain *pwrc_domain =
+ container_of(domain, struct meson_secure_pwrc_domain, base);
+
+ arm_smccc_smc(SMC_PWRC_SET, pwrc_domain->index, PWRC_OFF,
+ 0, 0, 0, 0, 0, &res);
+
+ return 0;
+}
+
+static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
+{
+ struct arm_smccc_res res;
+ struct meson_secure_pwrc_domain *pwrc_domain =
+ container_of(domain, struct meson_secure_pwrc_domain, base);
+
+ arm_smccc_smc(SMC_PWRC_SET, pwrc_domain->index, PWRC_ON,
+ 0, 0, 0, 0, 0, &res);
+
+ return 0;
+}
+
+#define SEC_PD(__name, __flag) \
+{ \
+ .name = #__name, \
+ .index = PWRC_##__name##_ID, \
+ .get_power = pwrc_secure_get_power, \
+ .flags = __flag, \
+}
+
+static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
+ SEC_PD(DSPA, 0),
+ SEC_PD(DSPB, 0),
+ SEC_PD(UART, GENPD_FLAG_ALWAYS_ON),
+ SEC_PD(DMC, GENPD_FLAG_ALWAYS_ON),
+ SEC_PD(I2C, 0),
+ SEC_PD(PSRAM, 0),
+ SEC_PD(ACODEC, 0),
+ SEC_PD(AUDIO, 0),
+ SEC_PD(OTP, 0),
+ SEC_PD(DMA, 0),
+ SEC_PD(SD_EMMC, 0),
+ SEC_PD(RAMA, 0),
+ SEC_PD(RAMB, GENPD_FLAG_ALWAYS_ON),
+ SEC_PD(IR, 0),
+ SEC_PD(SPICC, 0),
+ SEC_PD(SPIFC, 0),
+ SEC_PD(USB, 0),
+ SEC_PD(NIC, GENPD_FLAG_ALWAYS_ON),
+ SEC_PD(PDMIN, 0),
+ SEC_PD(RSA, 0),
+};
+
+static int meson_secure_pwrc_probe(struct platform_device *pdev)
+{
+ const struct meson_secure_pwrc_domain_data *match;
+ struct meson_secure_pwrc *pwrc;
+ int i;
+
+ match = of_device_get_match_data(&pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "failed to get match data\n");
+ return -ENODEV;
+ }
+
+ pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
+ if (!pwrc)
+ return -ENOMEM;
+
+ pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
+ sizeof(*pwrc->xlate.domains),
+ GFP_KERNEL);
+ if (!pwrc->xlate.domains)
+ return -ENOMEM;
+
+ pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
+ sizeof(*pwrc->domains), GFP_KERNEL);
+ if (!pwrc->domains)
+ return -ENOMEM;
+
+ pwrc->xlate.num_domains = match->count;
+ platform_set_drvdata(pdev, pwrc);
+
+ for (i = 0 ; i < match->count ; ++i) {
+ struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
+
+ if (!match->domains[i].index)
+ continue;
+
+ dom->index = match->domains[i].index;
+ dom->base.name = match->domains[i].name;
+ dom->base.flags = match->domains[i].flags;
+ dom->base.power_on = meson_secure_pwrc_on;
+ dom->base.power_off = meson_secure_pwrc_off;
+
+ pm_genpd_init(&dom->base, NULL,
+ (match->domains[i].get_power ?
+ match->domains[i].get_power(dom) : true));
+
+ pwrc->xlate.domains[i] = &dom->base;
+ }
+
+ return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
+}
+
+static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
+ .domains = a1_pwrc_domains,
+ .count = ARRAY_SIZE(a1_pwrc_domains),
+};
+
+static const struct of_device_id meson_secure_pwrc_match_table[] = {
+ {
+ .compatible = "amlogic,meson-a1-pwrc",
+ .data = &meson_secure_a1_pwrc_data,
+ },
+ { }
+};
+
+static struct platform_driver meson_secure_pwrc_driver = {
+ .probe = meson_secure_pwrc_probe,
+ .driver = {
+ .name = "meson_secure_pwrc",
+ .of_match_table = meson_secure_pwrc_match_table,
+ },
+};
+
+static int meson_secure_pwrc_init(void)
+{
+ return platform_driver_register(&meson_secure_pwrc_driver);
+}
+arch_initcall_sync(meson_secure_pwrc_init);
--
2.7.4
