152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/init.h>
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#include <linux/of_platform.h>
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#include <linux/pm_qos.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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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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struct cpufreq_policy *policy;
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struct freq_qos_request *req;
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u8 node, slow_mode;
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int cpu, ret;
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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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cpu = cbe_node_to_cpu(node);
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pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
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policy = cpufreq_cpu_get(cpu);
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if (!policy) {
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pr_warn("cpufreq policy not found cpu%d\n", cpu);
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return;
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}
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req = policy->driver_data;
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ret = freq_qos_update_request(req,
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policy->freq_table[slow_mode].frequency);
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if (ret < 0)
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pr_warn("Failed to update freq constraint: %d\n", ret);
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else
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pr_debug("limiting node %d to slow mode %d\n", node, slow_mode);
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cpufreq_cpu_put(policy);
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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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void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy)
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{
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struct freq_qos_request *req;
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int ret;
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if (!cbe_cpufreq_has_pmi)
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return;
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req = kzalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return;
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ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MAX,
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policy->freq_table[0].frequency);
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if (ret < 0) {
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pr_err("Failed to add freq constraint (%d)\n", ret);
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kfree(req);
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return;
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}
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policy->driver_data = req;
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}
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EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init);
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void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy)
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{
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struct freq_qos_request *req = policy->driver_data;
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if (cbe_cpufreq_has_pmi) {
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freq_qos_remove_request(req);
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kfree(req);
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}
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}
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EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_exit);
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void cbe_cpufreq_pmi_init(void)
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{
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if (!pmi_register_handler(&cbe_pmi_handler))
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cbe_cpufreq_has_pmi = true;
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}
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EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_init);
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void cbe_cpufreq_pmi_exit(void)
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{
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pmi_unregister_handler(&cbe_pmi_handler);
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cbe_cpufreq_has_pmi = false;
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}
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EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_exit);
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