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151 lines
3.1 KiB
151 lines
3.1 KiB
// 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 <[email protected]> |
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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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