dm: sysreset: x86: Add a sysreset driver

This adds a generic reset driver for x86 processor.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index f2524c18b7bbccd3e0235afdc60bc67731d5b59d..9b2fda4d2510b4147647d68785b89ab5ee8f63bf 100644 (file)
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -51,4 +51,10 @@ config SYSRESET_WATCHDOG
        help
          Reboot support for generic watchdog reset.
 
+config SYSRESET_X86
+       bool "Enable support for x86 processor reboot driver"
+       depends on X86
+       help
+         Reboot support for generic x86 processor reset.
+
 endmenu

diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 223a0716f0a3f37dc3e72a063eac2603e29d3ec5..707f1d74691c9a0db851b2654e49c36fbabeb3f3 100644 (file)
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o
 obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
+obj-$(CONFIG_SYSRESET_X86) += sysreset_x86.o
 obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o
 obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
 obj-$(CONFIG_ARCH_STI) += sysreset_sti.o

diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
new file mode 100644 (file)
index 0000000..5943a63
--- /dev/null
+++ b/drivers/sysreset/sysreset_x86.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Generic reset driver for x86 processor
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <sysreset.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+
+static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+       int value;
+
+       switch (type) {
+       case SYSRESET_WARM:
+               value = SYS_RST | RST_CPU;
+               break;
+       case SYSRESET_COLD:
+               value = SYS_RST | RST_CPU | FULL_RST;
+               break;
+       default:
+               return -ENOSYS;
+       }
+
+       outb(value, IO_PORT_RESET);
+
+       return -EINPROGRESS;
+}
+
+static const struct udevice_id x86_sysreset_ids[] = {
+       { .compatible = "x86,reset" },
+       { }
+};
+
+static struct sysreset_ops x86_sysreset_ops = {
+       .request = x86_sysreset_request,
+};
+
+U_BOOT_DRIVER(x86_sysreset) = {
+       .name = "x86-sysreset",
+       .id = UCLASS_SYSRESET,
+       .of_match = x86_sysreset_ids,
+       .ops = &x86_sysreset_ops,
+       .flags = DM_FLAG_PRE_RELOC,
+};