[PATCH 3/5] sysreset: provide SBI based sysreset driver

Heinrich Schuchardt xypron.glpk at gmx.de
Thu Mar 4 18:00:49 CET 2021


Provide sysreset driver using the SBI system reset extension.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 MAINTAINERS                     |   1 +
 arch/riscv/include/asm/sbi.h    |   1 +
 arch/riscv/lib/sbi.c            |  21 +++++--
 drivers/sysreset/Kconfig        |  11 ++++
 drivers/sysreset/Makefile       |   1 +
 drivers/sysreset/sysreset_sbi.c | 102 ++++++++++++++++++++++++++++++++
 lib/efi_loader/Kconfig          |   2 +-
 7 files changed, 134 insertions(+), 5 deletions(-)
 create mode 100644 drivers/sysreset/sysreset_sbi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index de499940e5..192db06ff9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -985,6 +985,7 @@ T:	git https://source.denx.de/u-boot/custodians/u-boot-riscv.git
 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/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index c598bb11ce..058e2e23a8 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -150,5 +150,6 @@ void sbi_set_timer(uint64_t stime_value);
 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 77845a73ca..8508041f2a 100644
--- a/arch/riscv/lib/sbi.c
+++ b/arch/riscv/lib/sbi.c
@@ -8,13 +8,14 @@
  */

 #include <common.h>
+#include <efi_loader.h>
 #include <asm/encoding.h>
 #include <asm/sbi.h>

-struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
-			unsigned long arg1, unsigned long arg2,
-			unsigned long arg3, unsigned long arg4,
-			unsigned long arg5)
+struct sbiret __efi_runtime sbi_ecall(int ext, int fid, unsigned long arg0,
+				      unsigned long arg1, unsigned long arg2,
+				      unsigned long arg3, unsigned long arg4,
+				      unsigned long arg5)
 {
 	struct sbiret ret;

@@ -108,6 +109,18 @@ int sbi_probe_extension(int extid)
 	return -ENOTSUPP;
 }

+/**
+ * sbi_srst_reset() - invoke system reset extension
+ *
+ * @type:	type of reset
+ * @reason:	reason for reset
+ */
+void __efi_runtime 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 0e5c7c9971..05a7e26300 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -79,6 +79,17 @@ config SYSRESET_PSCI
 	  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.
+	  If the SBI implemention provides the extension, is board specific.
+	  The extension was introduced in version 0.3 of the SBI specification.
+	  The SBI system reset driver supports the UEFI ResetSystem() service
+	  at runtime.
+
 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 de81c399d7..8e00be0779 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o
 obj-$(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 0000000000..87fbc3ea3e
--- /dev/null
+++ b/drivers/sysreset/sysreset_sbi.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021, Heinrich Schuchardt <xypron.glpk at gmx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <efi_loader.h>
+#include <log.h>
+#include <sysreset.h>
+#include <asm/sbi.h>
+
+static long __efi_runtime_data have_reset;
+
+static int sbi_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	enum sbi_srst_reset_type reset_type;
+
+	if (!have_reset)
+		return -ENOENT;
+
+	switch (type) {
+	case SYSRESET_WARM:
+		reset_type = SBI_SRST_RESET_TYPE_WARM_REBOOT;
+		break;
+	case SYSRESET_COLD:
+		reset_type = SBI_SRST_RESET_TYPE_COLD_REBOOT;
+		break;
+	case SYSRESET_POWER_OFF:
+		reset_type = SBI_SRST_RESET_TYPE_SHUTDOWN;
+		break;
+	default:
+		log_err("SBI has no system reset extension\n");
+		return -ENOSYS;
+	}
+
+	sbi_srst_reset(reset_type, SBI_SRST_RESET_REASON_NONE);
+
+	return -EINPROGRESS;
+}
+
+efi_status_t efi_reset_system_init(void)
+{
+	return EFI_SUCCESS;
+}
+
+void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type type,
+					   efi_status_t reset_status,
+					   unsigned long data_size,
+					   void *reset_data)
+{
+	enum sbi_srst_reset_type reset_type;
+
+	if (have_reset)
+		switch (type) {
+		case SYSRESET_WARM:
+			reset_type = SBI_SRST_RESET_TYPE_WARM_REBOOT;
+			break;
+		case SYSRESET_COLD:
+			reset_type = SBI_SRST_RESET_TYPE_COLD_REBOOT;
+			break;
+		case SYSRESET_POWER_OFF:
+			reset_type = SBI_SRST_RESET_TYPE_SHUTDOWN;
+			break;
+		default:
+			goto hang;
+	}
+
+	sbi_srst_reset(reset_type, SBI_SRST_RESET_REASON_NONE);
+
+hang:
+	while (1)
+		;
+}
+
+static int sbi_sysreset_probe(struct udevice *dev)
+{
+	have_reset = sbi_probe_extension(SBI_EXT_SRST);
+	if (have_reset)
+		return 0;
+
+	log_err("SBI has no system reset extension\n");
+	return -ENOENT;
+}
+
+static const struct udevice_id sbi_sysreset_ids[] = {
+	{ .compatible = "riscv" },
+	{ }
+};
+
+static struct sysreset_ops sbi_sysreset_ops = {
+	.request = sbi_sysreset_request,
+};
+
+U_BOOT_DRIVER(sbi_sysreset) = {
+	.name = "sbi-sysreset",
+	.id = UCLASS_SYSRESET,
+	.of_match = sbi_sysreset_ids,
+	.ops = &sbi_sysreset_ops,
+	.probe = sbi_sysreset_probe,
+};
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index e729f727df..7e76435339 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -277,7 +277,7 @@ config EFI_HAVE_RUNTIME_RESET
 	bool
 	default y
 	depends on ARCH_BCM283X || FSL_LAYERSCAPE || PSCI_RESET || \
-		   SANDBOX || SYSRESET_X86
+		   SANDBOX || SYSRESET_SBI || SYSRESET_X86

 config EFI_GRUB_ARM32_WORKAROUND
 	bool "Workaround for GRUB on 32bit ARM"
--
2.30.1



More information about the U-Boot mailing list