sysreset: provide SBI based sysreset driver
Provide sysreset driver using the SBI system reset extension.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Samuel Holland <samuel@sholland.org>
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index ac77ffb..43a948c 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -85,6 +85,18 @@
Enable PSCI SYSTEM_RESET function call. To use this, PSCI firmware
must be running on your system.
+config SYSRESET_SBI
+ bool "Enable support for SBI System Reset"
+ depends on RISCV_SMODE && SBI_V02
+ select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
+ help
+ Enable system reset and poweroff via the SBI system reset extension.
+ The extension was introduced in version 0.3 of the SBI specification.
+
+ If the SBI implementation provides the extension, is board specific.
+ The RISC-V platform specification mandates the extension for rich
+ operating system platforms.
+
config SYSRESET_SOCFPGA
bool "Enable support for Intel SOCFPGA family"
depends on ARCH_SOCFPGA && (TARGET_SOCFPGA_GEN5 || TARGET_SOCFPGA_ARRIA10)
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index de81c39..8e00be0 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -13,6 +13,7 @@
obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o
obj-$(CONFIG_SYSRESET_OCTEON) += sysreset_octeon.o
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_TI_SCI) += sysreset-ti-sci.o
diff --git a/drivers/sysreset/sysreset_sbi.c b/drivers/sysreset/sysreset_sbi.c
new file mode 100644
index 0000000..5e8090d
--- /dev/null
+++ b/drivers/sysreset/sysreset_sbi.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021, Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <log.h>
+#include <sysreset.h>
+#include <asm/sbi.h>
+
+static enum sbi_srst_reset_type reset_type_map[SYSRESET_COUNT] = {
+ [SYSRESET_WARM] = SBI_SRST_RESET_TYPE_WARM_REBOOT,
+ [SYSRESET_COLD] = SBI_SRST_RESET_TYPE_COLD_REBOOT,
+ [SYSRESET_POWER] = SBI_SRST_RESET_TYPE_COLD_REBOOT,
+ [SYSRESET_POWER_OFF] = SBI_SRST_RESET_TYPE_SHUTDOWN,
+};
+
+static int sbi_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+ enum sbi_srst_reset_type reset_type;
+
+ reset_type = reset_type_map[type];
+ sbi_srst_reset(reset_type, SBI_SRST_RESET_REASON_NONE);
+
+ return -EINPROGRESS;
+}
+
+static int sbi_sysreset_probe(struct udevice *dev)
+{
+ long have_reset;
+
+ have_reset = sbi_probe_extension(SBI_EXT_SRST);
+ if (have_reset)
+ return 0;
+
+ log_warning("SBI has no system reset extension\n");
+ return -ENOENT;
+}
+
+static struct sysreset_ops sbi_sysreset_ops = {
+ .request = sbi_sysreset_request,
+};
+
+U_BOOT_DRIVER(sbi_sysreset) = {
+ .name = "sbi-sysreset",
+ .id = UCLASS_SYSRESET,
+ .ops = &sbi_sysreset_ops,
+ .probe = sbi_sysreset_probe,
+};