From: Stephen Warren <swar...@nvidia.com>
In Tegra186, SoC power domains are manipulated using IPC requests to
the BPMP (Boot and Power Management Processor). This change implements a
driver that does that.
Signed-off-by: Stephen Warren <swar...@nvidia.com>
---
v3: Use misc class call op.
v2: This patch wasn't posted.
---
drivers/power/domain/Kconfig | 7 +++
drivers/power/domain/Makefile | 1 +
drivers/power/domain/tegra186-power-domain.c | 87 ++++++++++++++++++++++++++++
3 files changed, 95 insertions(+)
create mode 100644 drivers/power/domain/tegra186-power-domain.c
diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index b90409743398..132e33250e8c 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -17,4 +17,11 @@ config SANDBOX_POWER_DOMAIN
simply accepts requests to power on/off various HW modules without
actually doing anything beyond a little error checking.
+config TEGRA186_POWER_DOMAIN
+ bool "Enable Tegra186 BPMP-based power domain driver"
+ depends on TEGRA186_BPMP
+ help
+ Enable support for manipulating Tegra's on-SoC power domains via IPC
+ requests to the BPMP (Boot and Power Management Processor).
+
endmenu
diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index c18292f0ec88..2c3d92638fbe 100644
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -5,3 +5,4 @@
obj-$(CONFIG_POWER_DOMAIN) += power-domain-uclass.o
obj-$(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/tegra186-power-domain.c
b/drivers/power/domain/tegra186-power-domain.c
new file mode 100644
index 000000000000..c97dc3dcda6f
--- /dev/null
+++ b/drivers/power/domain/tegra186-power-domain.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <misc.h>
+#include <power-domain-uclass.h>
+#include <asm/arch-tegra/bpmp_abi.h>
+
+#define UPDATE BIT(0)
+#define ON BIT(1)
+
+static int tegra186_power_domain_request(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
+ power_domain, power_domain->dev, power_domain->id);
+
+ return 0;
+}
+
+static int tegra186_power_domain_free(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
+ power_domain, power_domain->dev, power_domain->id);
+
+ return 0;
+}
+
+static int tegra186_power_domain_common(struct power_domain *power_domain,
+ bool on)
+{
+ struct mrq_pg_update_state_request req;
+ int on_state = on ? ON : 0;
+
+ req.partition_id = power_domain->id;
+ req.logic_state = UPDATE | on_state;
+ req.sram_state = UPDATE | on_state;
+ /*
+ * Drivers manage their own clocks so they don't get out of sync, and
+ * since some power domains have many clocks, only a subset of which
+ * are actually needed depending on use-case.
+ */
+ req.clock_state = UPDATE;
+
+ return misc_call(power_domain->dev->parent, MRQ_PG_UPDATE_STATE, &req,
+ sizeof(req), NULL, 0);
+}
+
+static int tegra186_power_domain_on(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
+ power_domain, power_domain->dev, power_domain->id);
+
+ return tegra186_power_domain_common(power_domain, true);
+}
+
+static int tegra186_power_domain_off(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
+ power_domain, power_domain->dev, power_domain->id);
+
+ return tegra186_power_domain_common(power_domain, false);
+}
+
+struct power_domain_ops tegra186_power_domain_ops = {
+ .request = tegra186_power_domain_request,
+ .free = tegra186_power_domain_free,
+ .on = tegra186_power_domain_on,
+ .off = tegra186_power_domain_off,
+};
+
+static int tegra186_power_domain_probe(struct udevice *dev)
+{
+ debug("%s(dev=%p)\n", __func__, dev);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(tegra186_power_domain) = {
+ .name = "tegra186_power_domain",
+ .id = UCLASS_POWER_DOMAIN,
+ .probe = tegra186_power_domain_probe,
+ .ops = &tegra186_power_domain_ops,
+};
--
2.9.2
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