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authorSimon Glass <sjg@chromium.org>2015-04-28 20:25:09 -0600
committerSimon Glass <sjg@chromium.org>2015-04-29 21:02:33 -0600
commit11f4dc1583c387fbb46d473c942c4bcfe5af303e (patch)
tree109694befb15f2f476a8ce7f861680f06590ed3b /drivers/cpu
parent33eac2dc25eb8b38d2991c61036d20f707fdd54f (diff)
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dm: Implement a CPU uclass
It is useful to be able to keep track of the available CPUs in a multi-CPU system. This uclass is mostly intended for use with SMP systems. The uclass provides methods for getting basic information about each CPU. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/cpu')
-rw-r--r--drivers/cpu/Kconfig8
-rw-r--r--drivers/cpu/Makefile7
-rw-r--r--drivers/cpu/cpu-uclass.c61
3 files changed, 76 insertions, 0 deletions
diff --git a/drivers/cpu/Kconfig b/drivers/cpu/Kconfig
new file mode 100644
index 0000000..0d1424d
--- /dev/null
+++ b/drivers/cpu/Kconfig
@@ -0,0 +1,8 @@
+config CPU
+ bool "Enable CPU drivers using Driver Model"
+ help
+ This allows drivers to be provided for CPUs and their type to be
+ specified in the board's device tree. For boards which support
+ multiple CPUs, then normally have to be set up in U-Boot so that
+ they can work correctly in the OS. This provides a framework for
+ finding out information about available CPUs and making changes.
diff --git a/drivers/cpu/Makefile b/drivers/cpu/Makefile
new file mode 100644
index 0000000..8710160
--- /dev/null
+++ b/drivers/cpu/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2015 Google, Inc
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+obj-$(CONFIG_CPU) += cpu-uclass.o
diff --git a/drivers/cpu/cpu-uclass.c b/drivers/cpu/cpu-uclass.c
new file mode 100644
index 0000000..ab18ee2
--- /dev/null
+++ b/drivers/cpu/cpu-uclass.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+
+int cpu_get_desc(struct udevice *dev, char *buf, int size)
+{
+ struct cpu_ops *ops = cpu_get_ops(dev);
+
+ if (!ops->get_desc)
+ return -ENOSYS;
+
+ return ops->get_desc(dev, buf, size);
+}
+
+int cpu_get_info(struct udevice *dev, struct cpu_info *info)
+{
+ struct cpu_ops *ops = cpu_get_ops(dev);
+
+ if (!ops->get_desc)
+ return -ENOSYS;
+
+ return ops->get_info(dev, info);
+}
+
+U_BOOT_DRIVER(cpu_bus) = {
+ .name = "cpu_bus",
+ .id = UCLASS_SIMPLE_BUS,
+ .per_child_platdata_auto_alloc_size = sizeof(struct cpu_platdata),
+};
+
+static int uclass_cpu_init(struct uclass *uc)
+{
+ struct udevice *dev;
+ int node;
+ int ret;
+
+ node = fdt_path_offset(gd->fdt_blob, "/cpus");
+ if (node < 0)
+ return 0;
+
+ ret = device_bind_driver_to_node(dm_root(), "cpu_bus", "cpus", node,
+ &dev);
+
+ return ret;
+}
+
+UCLASS_DRIVER(cpu) = {
+ .id = UCLASS_CPU,
+ .name = "cpu",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+ .init = uclass_cpu_init,
+};