x86: tangier: Add a sysreset driver

This adds a reset driver for tangier processor.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/arch/x86/cpu/tangier/Makefile b/arch/x86/cpu/tangier/Makefile
index 44ccb3ff91e02be30e85008dfc241a41cff0f8ce..827448257e4b355d0a36a2d0993ac2d09d29288e 100644 (file)
--- a/arch/x86/cpu/tangier/Makefile
+++ b/arch/x86/cpu/tangier/Makefile
@@ -2,5 +2,5 @@
 #
 # Copyright (c) 2017 Intel Corporation
 
-obj-y += car.o tangier.o sdram.o
+obj-y += car.o tangier.o sdram.o sysreset.o
 obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi.o

diff --git a/arch/x86/cpu/tangier/sysreset.c b/arch/x86/cpu/tangier/sysreset.c
new file mode 100644 (file)
index 0000000..e762ee1
--- /dev/null
+++ b/arch/x86/cpu/tangier/sysreset.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Reset driver for tangier processor
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <sysreset.h>
+#include <asm/scu.h>
+
+static int tangier_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+       int value;
+
+       switch (type) {
+       case SYSRESET_WARM:
+               value = IPCMSG_WARM_RESET;
+               break;
+       case SYSRESET_COLD:
+               value = IPCMSG_COLD_RESET;
+               break;
+       default:
+               return -ENOSYS;
+       }
+
+       scu_ipc_simple_command(value, 0);
+
+       return -EINPROGRESS;
+}
+
+static const struct udevice_id tangier_sysreset_ids[] = {
+       { .compatible = "intel,reset-tangier" },
+       { }
+};
+
+static struct sysreset_ops tangier_sysreset_ops = {
+       .request = tangier_sysreset_request,
+};
+
+U_BOOT_DRIVER(tangier_sysreset) = {
+       .name = "tangier-sysreset",
+       .id = UCLASS_SYSRESET,
+       .of_match = tangier_sysreset_ids,
+       .ops = &tangier_sysreset_ops,
+       .flags = DM_FLAG_PRE_RELOC,
+};