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committed 20dfdb9c80fx
/* * cpufreq driver for the cell processor * * (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. *//* the CBE supports an 8 step frequency scaling */static struct cpufreq_frequency_table cbe_freqs[] = { {0, 1, 0}, {0, 2, 0}, {0, 3, 0}, {0, 4, 0}, {0, 5, 0}, {0, 6, 0}, {0, 8, 0}, {0, 10, 0}, {0, 0, CPUFREQ_TABLE_END},};/* * hardware specific functions */static int set_pmode(unsigned int cpu, unsigned int slow_mode){ int rc; if (cbe_cpufreq_has_pmi) rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode); else rc = cbe_cpufreq_set_pmode(cpu, slow_mode); pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu)); return rc;}/* * cpufreq functions */static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy){ struct cpufreq_frequency_table *pos; const u32 *max_freqp; u32 max_freq; int cur_pmode; struct device_node *cpu; cpu = of_get_cpu_node(policy->cpu, NULL); if (!cpu) return -ENODEV; pr_debug("init cpufreq on CPU %d\n", policy->cpu); /* * Let's check we can actually get to the CELL regs */ if (!cbe_get_cpu_pmd_regs(policy->cpu) || !cbe_get_cpu_mic_tm_regs(policy->cpu)) { pr_info("invalid CBE regs pointers for cpufreq\n"); return -EINVAL; } max_freqp = of_get_property(cpu, "clock-frequency", NULL);