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/MAINTAINERS b/MAINTAINERS
index 31b49c0..71f468c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1026,6 +1026,7 @@
F: arch/riscv/
F: cmd/riscv/
F: doc/usage/sbi.rst
+F: drivers/sysreset/sysreset_sbi.c
F: drivers/timer/andes_plmt_timer.c
F: drivers/timer/sifive_clint_timer.c
F: tools/prelink-riscv.c
diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c
index c894ac1..8e49b6d 100644
--- a/arch/riscv/cpu/cpu.c
+++ b/arch/riscv/cpu/cpu.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <cpu.h>
#include <dm.h>
+#include <dm/lists.h>
#include <init.h>
#include <log.h>
#include <asm/encoding.h>
@@ -138,7 +139,17 @@
int arch_early_init_r(void)
{
- return riscv_cpu_probe();
+ int ret;
+
+ ret = riscv_cpu_probe();
+ if (ret)
+ return ret;
+
+ if (IS_ENABLED(CONFIG_SYSRESET_SBI))
+ device_bind_driver(gd->dm_root, "sbi-sysreset",
+ "sbi-sysreset", NULL);
+
+ return 0;
}
/**
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 34a115a..5030892 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -153,5 +153,6 @@
long sbi_get_spec_version(void);
int sbi_get_impl_id(void);
int sbi_probe_extension(int ext);
+void sbi_srst_reset(unsigned long type, unsigned long reason);
#endif
diff --git a/arch/riscv/lib/sbi.c b/arch/riscv/lib/sbi.c
index 77845a7..2b53896 100644
--- a/arch/riscv/lib/sbi.c
+++ b/arch/riscv/lib/sbi.c
@@ -108,6 +108,18 @@
return -ENOTSUPP;
}
+/**
+ * sbi_srst_reset() - invoke system reset extension
+ *
+ * @type: type of reset
+ * @reason: reason for reset
+ */
+void sbi_srst_reset(unsigned long type, unsigned long reason)
+{
+ sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
+ 0, 0, 0, 0);
+}
+
#ifdef CONFIG_SBI_V01
/**
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,
+};