[PATCH v4 1/6] sysreset: tegra: create arch specific sysreset driver

[Svyatoslav Ryhel]

Tegra uses built in Power Management Controller (PMC) to perform
CPU reset. Code to perform this was located in mach-tegra, so lest
create DM driver to handle this.

Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/sysreset/Kconfig          |  6 ++++
 drivers/sysreset/Makefile         |  1 +
 drivers/sysreset/sysreset_tegra.c | 46 +++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 drivers/sysreset/sysreset_tegra.c

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index bdbe2a9536..eab556c349 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -137,6 +137,12 @@ config SYSRESET_SOCFPGA_SOC64
 	  This enables the system reset driver support for Intel SOCFPGA
 	  SoC64 SoCs.
 
+config SYSRESET_TEGRA
+	bool "Tegra PMC system reset driver"
+	depends on ARCH_TEGRA
+	help
+	  This enables the system reset ability of PMC used in Tegra SoCs.
+
 config SYSRESET_TI_SCI
 	bool "TI System Control Interface (TI SCI) system reset driver"
 	depends on TI_SCI_PROTOCOL
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 40c876764a..a9ac123754 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
 obj-$(CONFIG_SYSRESET_SBI) += sysreset_sbi.o
 obj-$(CONFIG_SYSRESET_SOCFPGA) += sysreset_socfpga.o
 obj-$(CONFIG_SYSRESET_SOCFPGA_SOC64) += sysreset_socfpga_soc64.o
+obj-$(CONFIG_SYSRESET_TEGRA) += sysreset_tegra.o
 obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
diff --git a/drivers/sysreset/sysreset_tegra.c b/drivers/sysreset/sysreset_tegra.c
new file mode 100644
index 0000000000..ee95826a29
--- /dev/null
+++ b/drivers/sysreset/sysreset_tegra.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright(C) 2023 Svyatoslav Ryhel <clamor95 at gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <linux/err.h>
+#include <asm/arch-tegra/pmc.h>
+
+static int tegra_sysreset_request(struct udevice *dev,
+				  enum sysreset_t type)
+{
+	u32 value;
+
+	switch (type) {
+	case SYSRESET_WARM:
+	case SYSRESET_COLD:
+		/* resets everything but scratch 0 and reset status */
+		value = tegra_pmc_readl(PMC_CNTRL);
+		value |= PMC_CNTRL_MAIN_RST;
+		tegra_pmc_writel(value, PMC_CNTRL);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops tegra_sysreset = {
+	.request = tegra_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_tegra) = {
+	.id	= UCLASS_SYSRESET,
+	.name	= "sysreset_tegra",
+	.ops	= &tegra_sysreset,
+};
+
+/* Link to Tegra PMC once there is a driver */
+U_BOOT_DRVINFO(sysreset_tegra) = {
+	.name = "sysreset_tegra"
+};
-- 
2.39.2