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Date: Thu, 3 Dec 2009 09:55:33 +0800
From: Wu Zhangjin <wuzhangjin@...il.com>
To: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Dave Jones <davej@...hat.com>,
Dominik Brodowski <linux@...inikbrodowski.net>,
cpufreq@...r.kernel.org, Wu Zhangjin <wuzhangjin@...il.com>
Subject: [PATCH v0] Loongson2: CPUFreq: add support to load module automatically
This patch registers a loongson2_cpufreq platform device, make the
CPUFreq support for loongson2 as a platform driver, and then bind them
together via the platform_device_id to allow it be loaded automatically
when booting. With this support, there is no need to add the module name
into /etc/modules.
Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com>
---
arch/mips/include/asm/cpu.h | 2 +
arch/mips/kernel/cpufreq/loongson2_cpufreq.c | 35 ++++++++++++++++++++++---
arch/mips/loongson/common/Makefile | 2 +-
arch/mips/loongson/common/platform.c | 32 +++++++++++++++++++++++
4 files changed, 65 insertions(+), 6 deletions(-)
create mode 100644 arch/mips/loongson/common/platform.c
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index 4b96d1a..cf373a9 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -154,6 +154,8 @@
#define PRID_REV_VR4181A 0x0070 /* Same as VR4122 */
#define PRID_REV_VR4130 0x0080
#define PRID_REV_34K_V1_0_2 0x0022
+#define PRID_REV_LOONGSON2E 0x0002
+#define PRID_REV_LOONGSON2F 0x0003
/*
* Older processors used to encode processor version and revision in two
diff --git a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c b/arch/mips/kernel/cpufreq/loongson2_cpufreq.c
index 7232dcb..2f6a0b1 100644
--- a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c
+++ b/arch/mips/kernel/cpufreq/loongson2_cpufreq.c
@@ -15,6 +15,7 @@
#include <linux/err.h>
#include <linux/sched.h> /* set_cpus_allowed() */
#include <linux/delay.h>
+#include <linux/platform_device.h>
#include <asm/clock.h>
@@ -163,23 +164,45 @@ static struct cpufreq_driver loongson2_cpufreq_driver = {
.attr = loongson2_table_attr,
};
+static struct platform_device_id platform_device_ids[] = {
+ {
+ .name = "loongson2_cpufreq",
+ },
+ {}
+};
+
+MODULE_DEVICE_TABLE(platform, platform_device_ids);
+
+static struct platform_driver platform_driver = {
+ .driver = {
+ .name = "loongson2_cpufreq",
+ .owner = THIS_MODULE,
+ },
+ .id_table = platform_device_ids,
+};
+
static int __init cpufreq_init(void)
{
- int result;
+ int ret;
+
+ /* Register platform stuff */
+ ret = platform_driver_register(&platform_driver);
+ if (ret)
+ return ret;
- printk(KERN_INFO "cpufreq: Loongson-2F CPU frequency driver.\n");
+ pr_info("cpufreq: Loongson-2F CPU frequency driver.\n");
cpufreq_register_notifier(&loongson2_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
- result = cpufreq_register_driver(&loongson2_cpufreq_driver);
+ ret = cpufreq_register_driver(&loongson2_cpufreq_driver);
- if (!result && !nowait) {
+ if (!ret && !nowait) {
saved_cpu_wait = cpu_wait;
cpu_wait = loongson2_cpu_wait;
}
- return result;
+ return ret;
}
static void __exit cpufreq_exit(void)
@@ -189,6 +212,8 @@ static void __exit cpufreq_exit(void)
cpufreq_unregister_driver(&loongson2_cpufreq_driver);
cpufreq_unregister_notifier(&loongson2_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
+
+ platform_driver_unregister(&platform_driver);
}
module_init(cpufreq_init);
diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index 01fc2f3..7668c4d 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -3,7 +3,7 @@
#
obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
- pci.o bonito-irq.o mem.o machtype.o
+ pci.o bonito-irq.o mem.o machtype.o platform.o
#
# Serial port support
diff --git a/arch/mips/loongson/common/platform.c b/arch/mips/loongson/common/platform.c
new file mode 100644
index 0000000..fdb24fd
--- /dev/null
+++ b/arch/mips/loongson/common/platform.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin, wuzj@...ote.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include <asm/bootinfo.h>
+
+static struct platform_device loongson2_cpufreq_device = {
+ .name = "loongson2_cpufreq",
+ .id = -1,
+};
+
+static int __init loongson2_cpufreq_init(void)
+{
+ struct cpuinfo_mips *c = ¤t_cpu_data;
+
+ /* Only 2F revision and it's successors support CPUFreq */
+ if ((c->processor_id & PRID_REV_MASK) >= PRID_REV_LOONGSON2F)
+ return platform_device_register(&loongson2_cpufreq_device);
+
+ return -ENODEV;
+}
+
+arch_initcall(loongson2_cpufreq_init);
--
1.6.2.1
--
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