reset: add Tegra186 reset driver

In Tegra186, on-SoC reset signals are manipulated using IPC requests to
the BPMP (Boot and Power Management Processor). This change implements a
driver that does that. It is unconditionally selected by CONFIG_TEGRA186
since virtually any Tegra186 build of U-Boot will need the feature.

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/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index e8186d5158569619304e19fe359622dc48576a72..1eaf40627254d3f8e3992a56a77eaafd34b01ffe 100644 (file)
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -66,10 +66,12 @@ config TEGRA186
        bool "Tegra186 family"
        select CLK
        select DM_MAILBOX
+       select DM_RESET
        select MISC
        select TEGRA186_BPMP
        select TEGRA186_CLOCK
        select TEGRA186_GPIO
+       select TEGRA186_RESET
        select TEGRA_ARMV8_COMMON
        select TEGRA_HSP
        select TEGRA_IVC

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 0fe8cc3827f14bea1f04e9ff29722a09182aa621..5b84f2178b7121ca7ea98f909ee197c4b8e7af47 100644 (file)
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -20,4 +20,11 @@ config SANDBOX_RESET
          simply accepts requests to reset various HW modules without actually
          doing anything beyond a little error checking.
 
+config TEGRA186_RESET
+       bool "Enable Tegra186 BPMP-based reset driver"
+       depends on TEGRA186_BPMP
+       help
+         Enable support for manipulating Tegra's on-SoC reset signals via IPC
+         requests to the BPMP (Boot and Power Management Processor).
+
 endmenu

diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 71f3b219613ef183f54a59d8887f69b3d9e2c83f..ff0e0907758be3fd3940db40eae5e69fad352989 100644 (file)
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -5,3 +5,4 @@
 obj-$(CONFIG_DM_RESET) += reset-uclass.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o
+obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o

diff --git a/drivers/reset/tegra186-reset.c b/drivers/reset/tegra186-reset.c
new file mode 100644 (file)
index 0000000..228adda
--- /dev/null
+++ b/drivers/reset/tegra186-reset.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <misc.h>
+#include <reset-uclass.h>
+#include <asm/arch-tegra/bpmp_abi.h>
+
+static int tegra186_reset_request(struct reset_ctl *reset_ctl)
+{
+       debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+             reset_ctl->dev, reset_ctl->id);
+
+       return 0;
+}
+
+static int tegra186_reset_free(struct reset_ctl *reset_ctl)
+{
+       debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+             reset_ctl->dev, reset_ctl->id);
+
+       return 0;
+}
+
+static int tegra186_reset_common(struct reset_ctl *reset_ctl,
+                                enum mrq_reset_commands cmd)
+{
+       struct mrq_reset_request req;
+       int ret;
+
+       req.cmd = cmd;
+       req.reset_id = reset_ctl->id;
+
+       ret = misc_call(reset_ctl->dev->parent, MRQ_RESET, &req, sizeof(req),
+                       NULL, 0);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static int tegra186_reset_assert(struct reset_ctl *reset_ctl)
+{
+       debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+             reset_ctl->dev, reset_ctl->id);
+
+       return tegra186_reset_common(reset_ctl, CMD_RESET_ASSERT);
+}
+
+static int tegra186_reset_deassert(struct reset_ctl *reset_ctl)
+{
+       debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+             reset_ctl->dev, reset_ctl->id);
+
+       return tegra186_reset_common(reset_ctl, CMD_RESET_DEASSERT);
+}
+
+struct reset_ops tegra186_reset_ops = {
+       .request = tegra186_reset_request,
+       .free = tegra186_reset_free,
+       .rst_assert = tegra186_reset_assert,
+       .rst_deassert = tegra186_reset_deassert,
+};
+
+static int tegra186_reset_probe(struct udevice *dev)
+{
+       debug("%s(dev=%p)\n", __func__, dev);
+
+       return 0;
+}
+
+U_BOOT_DRIVER(tegra186_reset) = {
+       .name           = "tegra186_reset",
+       .id             = UCLASS_RESET,
+       .probe          = tegra186_reset_probe,
+       .ops = &tegra186_reset_ops,
+};