reset: Add Tegra BPMP reset driver

This driver uses the services provided by the BPMP firmware driver to
implement a reset driver based on the MRQ_RESET request.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 06d9fa2f3bc099efccabc3bb5d7c6b847e19fd0c..172dc966a01fb087c87d014e8f6f7d7299c09aff 100644 (file)
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -94,5 +94,6 @@ config RESET_ZYNQ
 
 source "drivers/reset/sti/Kconfig"
 source "drivers/reset/hisilicon/Kconfig"
+source "drivers/reset/tegra/Kconfig"
 
 endif

diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index bbe7026617fc77f0ed5766f73186d6dd36f8d0f3..13b346e03d84b5b924100e96ad99f5f9f0c7a4b8 100644 (file)
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -1,6 +1,7 @@
 obj-y += core.o
 obj-y += hisilicon/
 obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_TEGRA) += tegra/
 obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
 obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
 obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o

diff --git a/drivers/reset/tegra/Kconfig b/drivers/reset/tegra/Kconfig
new file mode 100644 (file)
index 0000000..d2afa29
--- /dev/null
+++ b/drivers/reset/tegra/Kconfig
@@ -0,0 +1,2 @@
+config RESET_TEGRA_BPMP
+       def_bool TEGRA_BPMP

diff --git a/drivers/reset/tegra/Makefile b/drivers/reset/tegra/Makefile
new file mode 100644 (file)
index 0000000..775243a
--- /dev/null
+++ b/drivers/reset/tegra/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_RESET_TEGRA_BPMP) += reset-bpmp.o

diff --git a/drivers/reset/tegra/reset-bpmp.c b/drivers/reset/tegra/reset-bpmp.c
new file mode 100644 (file)
index 0000000..5daf2ee
--- /dev/null
+++ b/drivers/reset/tegra/reset-bpmp.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2016 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/reset-controller.h>
+
+#include <soc/tegra/bpmp.h>
+#include <soc/tegra/bpmp-abi.h>
+
+static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
+{
+       return container_of(rstc, struct tegra_bpmp, rstc);
+}
+
+static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
+                                  enum mrq_reset_commands command,
+                                  unsigned int id)
+{
+       struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
+       struct mrq_reset_request request;
+       struct tegra_bpmp_message msg;
+
+       memset(&request, 0, sizeof(request));
+       request.cmd = command;
+       request.reset_id = id;
+
+       memset(&msg, 0, sizeof(msg));
+       msg.mrq = MRQ_RESET;
+       msg.tx.data = &request;
+       msg.tx.size = sizeof(request);
+
+       return tegra_bpmp_transfer(bpmp, &msg);
+}
+
+static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
+                                  unsigned long id)
+{
+       return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
+}
+
+static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
+                                  unsigned long id)
+{
+       return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
+}
+
+static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
+                                    unsigned long id)
+{
+       return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
+}
+
+static const struct reset_control_ops tegra_bpmp_reset_ops = {
+       .reset = tegra_bpmp_reset_module,
+       .assert = tegra_bpmp_reset_assert,
+       .deassert = tegra_bpmp_reset_deassert,
+};
+
+int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
+{
+       bpmp->rstc.ops = &tegra_bpmp_reset_ops;
+       bpmp->rstc.owner = THIS_MODULE;
+       bpmp->rstc.of_node = bpmp->dev->of_node;
+       bpmp->rstc.nr_resets = bpmp->soc->num_resets;
+
+       return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
+}