From: Thierry Reding <treding@xxxxxxxxxx>
This driver uses the services provided by the BPMP firmware driver to
implement a reset driver based on the MRQ_RESET request.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/reset/Makefile | 1 +
drivers/reset/tegra/Makefile | 1 +
drivers/reset/tegra/reset-bpmp.c | 63 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 65 insertions(+)
create mode 100644 drivers/reset/tegra/Makefile
create mode 100644 drivers/reset/tegra/reset-bpmp.c
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 5d65a93d3c43..523f2d705d24 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_MACH_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_ARCH_MESON) += reset-meson.o
obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_ARCH_HISI) += hisilicon/
obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
obj-$(CONFIG_ATH79) += reset-ath79.o
diff --git a/drivers/reset/tegra/Makefile b/drivers/reset/tegra/Makefile
new file mode 100644
index 000000000000..fd943b1ae029
--- /dev/null
+++ b/drivers/reset/tegra/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARCH_TEGRA_186_SOC) += reset-bpmp.o
diff --git a/drivers/reset/tegra/reset-bpmp.c b/drivers/reset/tegra/reset-bpmp.c
new file mode 100644
index 000000000000..a06e45dc3f30
--- /dev/null
+++ b/drivers/reset/tegra/reset-bpmp.c
@@ -0,0 +1,63 @@
+#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);
+}
--
2.9.0
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