linux/drivers/cpufreq/pcc-cpufreq.c

/*
 *  pcc-cpufreq.c - Processor Clocking Control firmware cpufreq interface
 *
 *  Copyright (C) 2009 Red Hat, Matthew Garrett <[email protected]>
 *  Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 *	Nagananda Chumbalkar <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or NON
 *  INFRINGEMENT. See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/platform_device.h>

#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>

#include <acpi/processor.h>

#define PCC_VERSION …
#define POLL_LOOPS …

#define CMD_COMPLETE …
#define CMD_GET_FREQ …
#define CMD_SET_FREQ …

#define BUF_SZ …

struct pcc_register_resource { … } __attribute__ ((packed));

struct pcc_memory_resource { … } __attribute__ ((packed));

static struct cpufreq_driver pcc_cpufreq_driver;

struct pcc_header { … };

static void __iomem *pcch_virt_addr;
static struct pcc_header __iomem *pcch_hdr;

static DEFINE_SPINLOCK(pcc_lock);

static struct acpi_generic_address doorbell;

static u64 doorbell_preserve;
static u64 doorbell_write;

static u8 OSC_UUID[16] = …;

struct pcc_cpu { … };

static struct pcc_cpu __percpu *pcc_cpu_info;

static int pcc_cpufreq_verify(struct cpufreq_policy_data *policy)
{ … }

static inline void pcc_cmd(void)
{ … }

static inline void pcc_clear_mapping(void)
{ … }

static unsigned int pcc_get_freq(unsigned int cpu)
{ … }

static int pcc_cpufreq_target(struct cpufreq_policy *policy,
			      unsigned int target_freq,
			      unsigned int relation)
{ … }

static int pcc_get_offset(int cpu)
{ … }

static int __init pcc_cpufreq_do_osc(acpi_handle *handle)
{ … }

static int __init pcc_cpufreq_evaluate(void)
{ … }

static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy)
{ … }

static struct cpufreq_driver pcc_cpufreq_driver = …;

static int __init pcc_cpufreq_probe(struct platform_device *pdev)
{ … }

static void pcc_cpufreq_remove(struct platform_device *pdev)
{ … }

static struct platform_driver pcc_cpufreq_platdrv = …;

static int __init pcc_cpufreq_init(void)
{ … }

static void __exit pcc_cpufreq_exit(void)
{ … }

MODULE_ALIAS(…) …;

MODULE_AUTHOR(…) …;
MODULE_VERSION(…);
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;

late_initcall(pcc_cpufreq_init);
module_exit(pcc_cpufreq_exit);