linux-imx

/*

 * pmi backend for the cbe_cpufreq driver

 *

 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007

 *

 * Author: Christian Krafft <krafft@de.ibm.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, or (at your option)

 * any later version.

 *

 * 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.  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/types.h>

#include <linux/timer.h>

#include <linux/init.h>

#include <linux/of_platform.h>

​

#include <asm/processor.h>

#include <asm/prom.h>

#include <asm/pmi.h>

#include <asm/cell-regs.h>

​

#ifdef DEBUG

#include <asm/time.h>

#endif

​

#include "ppc_cbe_cpufreq.h"

​

static u8 pmi_slow_mode_limit[MAX_CBE];

​

bool cbe_cpufreq_has_pmi = false;

EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);

​

/*

 * hardware specific functions

 */

​

int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode)

{

    int ret;

    pmi_message_t pmi_msg;

#ifdef DEBUG

    long time;

#endif

    pmi_msg.type = PMI_TYPE_FREQ_CHANGE;

    pmi_msg.data1 = cbe_cpu_to_node(cpu);

    pmi_msg.data2 = pmode;

​

#ifdef DEBUG

    time = jiffies;

#endif

    pmi_send_message(pmi_msg);

​

#ifdef DEBUG

    time = jiffies  - time;

    time = jiffies_to_msecs(time);

    pr_debug("had to wait %lu ms for a transition using " \

         "PMI\n", time);

#endif

    ret = pmi_msg.data2;

    pr_debug("PMI returned slow mode %d\n", ret);

​

    return ret;

}

EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);

​

​

static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)

{

    u8 node, slow_mode;

​

    BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);

​

    node = pmi_msg.data1;

    slow_mode = pmi_msg.data2;

​

    pmi_slow_mode_limit[node] = slow_mode;

​

    pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);

}

​