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156 lines
3.6 KiB
156 lines
3.6 KiB
/* |
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* pmi backend for the cbe_cpufreq driver |
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* |
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007 |
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* |
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* Author: Christian Krafft <krafft@de.ibm.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/timer.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <asm/processor.h> |
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#include <asm/prom.h> |
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#include <asm/pmi.h> |
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#include <asm/cell-regs.h> |
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#ifdef DEBUG |
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#include <asm/time.h> |
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#endif |
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#include "ppc_cbe_cpufreq.h" |
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static u8 pmi_slow_mode_limit[MAX_CBE]; |
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bool cbe_cpufreq_has_pmi = false; |
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EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi); |
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/* |
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* hardware specific functions |
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*/ |
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int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode) |
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{ |
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int ret; |
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pmi_message_t pmi_msg; |
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#ifdef DEBUG |
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long time; |
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#endif |
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pmi_msg.type = PMI_TYPE_FREQ_CHANGE; |
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pmi_msg.data1 = cbe_cpu_to_node(cpu); |
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pmi_msg.data2 = pmode; |
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#ifdef DEBUG |
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time = jiffies; |
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#endif |
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pmi_send_message(pmi_msg); |
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#ifdef DEBUG |
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time = jiffies - time; |
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time = jiffies_to_msecs(time); |
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pr_debug("had to wait %lu ms for a transition using " \ |
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"PMI\n", time); |
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#endif |
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ret = pmi_msg.data2; |
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pr_debug("PMI returned slow mode %d\n", ret); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi); |
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static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg) |
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{ |
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u8 node, slow_mode; |
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BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE); |
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node = pmi_msg.data1; |
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slow_mode = pmi_msg.data2; |
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pmi_slow_mode_limit[node] = slow_mode; |
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pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode); |
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} |
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static int pmi_notifier(struct notifier_block *nb, |
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unsigned long event, void *data) |
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{ |
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struct cpufreq_policy *policy = data; |
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struct cpufreq_frequency_table *cbe_freqs; |
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u8 node; |
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/* Should this really be called for CPUFREQ_ADJUST, CPUFREQ_INCOMPATIBLE |
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* and CPUFREQ_NOTIFY policy events?) |
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*/ |
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if (event == CPUFREQ_START) |
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return 0; |
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cbe_freqs = cpufreq_frequency_get_table(policy->cpu); |
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node = cbe_cpu_to_node(policy->cpu); |
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pr_debug("got notified, event=%lu, node=%u\n", event, node); |
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if (pmi_slow_mode_limit[node] != 0) { |
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pr_debug("limiting node %d to slow mode %d\n", |
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node, pmi_slow_mode_limit[node]); |
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cpufreq_verify_within_limits(policy, 0, |
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cbe_freqs[pmi_slow_mode_limit[node]].frequency); |
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} |
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return 0; |
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} |
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static struct notifier_block pmi_notifier_block = { |
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.notifier_call = pmi_notifier, |
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}; |
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static struct pmi_handler cbe_pmi_handler = { |
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.type = PMI_TYPE_FREQ_CHANGE, |
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.handle_pmi_message = cbe_cpufreq_handle_pmi, |
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}; |
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static int __init cbe_cpufreq_pmi_init(void) |
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{ |
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cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0; |
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if (!cbe_cpufreq_has_pmi) |
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return -ENODEV; |
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cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER); |
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return 0; |
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} |
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static void __exit cbe_cpufreq_pmi_exit(void) |
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{ |
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cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER); |
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pmi_unregister_handler(&cbe_pmi_handler); |
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} |
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module_init(cbe_cpufreq_pmi_init); |
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module_exit(cbe_cpufreq_pmi_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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