sysreset: tegra: create arch specific sysreset driver

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@gmail.com>

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index bdbe2a95364d3cb00ba1a7cb985d56838eb154d2..eab556c3499e6561c522cd6d11e908d0271fd8e3 100644 (file)
--- 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 40c876764af9cab0106c3854dc0b7aaf1563d94f..a9ac12375422a291b88294803163f762f8c9b2c2 100644 (file)
--- 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 (file)
index 0000000..10bcd3a
--- /dev/null
+++ b/drivers/sysreset/sysreset_tegra.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#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"
+};