linux-imx

/*

 *  pcc-cpufreq.c - Processor Clocking Control firmware cpufreq interface

 *

 *  Copyright (C) 2009 Red Hat, Matthew Garrett <mjg@redhat.com>

 *  Copyright (C) 2009 Hewlett-Packard Development Company, L.P.

 *  Nagananda Chumbalkar <nagananda.chumbalkar@hp.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; 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/acpi.h>

#include <linux/io.h>

#include <linux/spinlock.h>

#include <linux/uaccess.h>

​

#include <acpi/processor.h>

​

#define PCC_VERSION "1.10.00"

#define POLL_LOOPS  300

​

#define CMD_COMPLETE    0x1

#define CMD_GET_FREQ    0x0

#define CMD_SET_FREQ    0x1

​

#define BUF_SZ      4

​

struct pcc_register_resource {

    u8 descriptor;

    u16 length;

    u8 space_id;

    u8 bit_width;

    u8 bit_offset;

    u8 access_size;

    u64 address;

} __attribute__ ((packed));

​

struct pcc_memory_resource {

    u8 descriptor;

    u16 length;