power domain: add Tegra186 driver

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 <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index b9040974339855ba9353ef484782e4f305c63728..132e33250e8c2d3a8f95edf007d359f51703b0a3 100644 (file)
--- 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 c18292f0ec881b7460c6557c903e5ca40662a3dd..2c3d92638fbee3002aae593b41353de1d6b76d8c 100644 (file)
--- 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 (file)
index 0000000..41d84de
--- /dev/null
+++ b/drivers/power/domain/tegra186-power-domain.c
@@ -0,0 +1,92 @@
+/*
+ * 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;
+       int ret;
+
+       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;
+
+       ret = misc_call(power_domain->dev->parent, MRQ_PG_UPDATE_STATE, &req,
+                       sizeof(req), NULL, 0);
+       if (ret < 0)
+               return ret;
+
+       return 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,
+};