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Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
| -rw-r--r-- | arch/sh/kernel/cpufreq.c | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c deleted file mode 100644 index e0b384bef55..00000000000 --- a/arch/sh/kernel/cpufreq.c +++ /dev/null @@ -1,218 +0,0 @@ -/* - * arch/sh/kernel/cpufreq.c - * - * cpufreq driver for the SuperH processors. - * - * Copyright (C) 2002, 2003, 2004, 2005 Paul Mundt - * Copyright (C) 2002 M. R. Brown - * - * 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 of the License, or (at your - * option) any later version. - */ -#include <linux/types.h> -#include <linux/cpufreq.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/cpumask.h> -#include <linux/smp.h> - -#include <asm/processor.h> -#include <asm/watchdog.h> -#include <asm/freq.h> -#include <asm/io.h> - -/* - * For SuperH, each policy change requires that we change the IFC, BFC, and - * PFC at the same time. Here we define sane values that won't trash the - * system. - * - * Note the max set is computed at runtime, we use the divisors that we booted - * with to setup our maximum operating frequencies. - */ -struct clock_set { - unsigned int ifc; - unsigned int bfc; - unsigned int pfc; -} clock_sets[] = { -#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH2) - { 0, 0, 0 }, /* not implemented yet */ -#elif defined(CONFIG_CPU_SH4) - { 4, 8, 8 }, /* min - IFC: 1/4, BFC: 1/8, PFC: 1/8 */ - { 1, 2, 2 }, /* max - IFC: 1, BFC: 1/2, PFC: 1/2 */ -#endif -}; - -#define MIN_CLOCK_SET 0 -#define MAX_CLOCK_SET (ARRAY_SIZE(clock_sets) - 1) - -/* - * For the time being, we only support two frequencies, which in turn are - * aimed at the POWERSAVE and PERFORMANCE policies, which in turn are derived - * directly from the respective min/max clock sets. Technically we could - * support a wider range of frequencies, but these vary far too much for each - * CPU subtype (and we'd have to construct a frequency table for each subtype). - * - * Maybe something to implement in the future.. - */ -#define SH_FREQ_MAX 0 -#define SH_FREQ_MIN 1 - -static struct cpufreq_frequency_table sh_freqs[] = { - { SH_FREQ_MAX, 0 }, - { SH_FREQ_MIN, 0 }, - { 0, CPUFREQ_TABLE_END }, -}; - -static void sh_cpufreq_update_clocks(unsigned int set) -{ - current_cpu_data.cpu_clock = current_cpu_data.master_clock / clock_sets[set].ifc; - current_cpu_data.bus_clock = current_cpu_data.master_clock / clock_sets[set].bfc; - current_cpu_data.module_clock = current_cpu_data.master_clock / clock_sets[set].pfc; - current_cpu_data.loops_per_jiffy = loops_per_jiffy; -} - -/* XXX: This needs to be split out per CPU and CPU subtype. */ -/* - * Here we notify other drivers of the proposed change and the final change. - */ -static int sh_cpufreq_setstate(unsigned int cpu, unsigned int set) -{ - unsigned short frqcr = ctrl_inw(FRQCR); - cpumask_t cpus_allowed; - struct cpufreq_freqs freqs; - - if (!cpu_online(cpu)) - return -ENODEV; - - cpus_allowed = current->cpus_allowed; - set_cpus_allowed(current, cpumask_of_cpu(cpu)); - - BUG_ON(smp_processor_id() != cpu); - - freqs.cpu = cpu; - freqs.old = current_cpu_data.cpu_clock / 1000; - freqs.new = (current_cpu_data.master_clock / clock_sets[set].ifc) / 1000; - - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); -#if defined(CONFIG_CPU_SH3) - frqcr |= (newstate & 0x4000) << 14; - frqcr |= (newstate & 0x000c) << 2; -#elif defined(CONFIG_CPU_SH4) - /* - * FRQCR.PLL2EN is 1, we need to allow the PLL to stabilize by - * initializing the WDT. - */ - if (frqcr & (1 << 9)) { - __u8 csr; - - /* - * Set the overflow period to the highest available, - * in this case a 1/4096 division ratio yields a 5.25ms - * overflow period. See asm-sh/watchdog.h for more - * information and a range of other divisors. - */ - csr = sh_wdt_read_csr(); - csr |= WTCSR_CKS_4096; - sh_wdt_write_csr(csr); - - sh_wdt_write_cnt(0); - } - frqcr &= 0x0e00; /* Clear ifc, bfc, pfc */ - frqcr |= get_ifc_value(clock_sets[set].ifc) << 6; - frqcr |= get_bfc_value(clock_sets[set].bfc) << 3; - frqcr |= get_pfc_value(clock_sets[set].pfc); -#endif - ctrl_outw(frqcr, FRQCR); - sh_cpufreq_update_clocks(set); - - set_cpus_allowed(current, cpus_allowed); - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - return 0; -} - -static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy) -{ - unsigned int min_freq, max_freq; - unsigned int ifc, bfc, pfc; - - if (!cpu_online(policy->cpu)) - return -ENODEV; - - /* Update our maximum clock set */ - get_current_frequency_divisors(&ifc, &bfc, &pfc); - clock_sets[MAX_CLOCK_SET].ifc = ifc; - clock_sets[MAX_CLOCK_SET].bfc = bfc; - clock_sets[MAX_CLOCK_SET].pfc = pfc; - - /* Convert from Hz to kHz */ - max_freq = current_cpu_data.cpu_clock / 1000; - min_freq = (current_cpu_data.master_clock / clock_sets[MIN_CLOCK_SET].ifc) / 1000; - - sh_freqs[SH_FREQ_MAX].frequency = max_freq; - sh_freqs[SH_FREQ_MIN].frequency = min_freq; - - /* cpuinfo and default policy values */ - policy->governor = CPUFREQ_DEFAULT_GOVERNOR; - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; - policy->cur = max_freq; - - return cpufreq_frequency_table_cpuinfo(policy, &sh_freqs[0]); -} - -static int sh_cpufreq_verify(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, &sh_freqs[0]); -} - -static int sh_cpufreq_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - unsigned int set, idx = 0; - - if (cpufreq_frequency_table_target(policy, &sh_freqs[0], target_freq, relation, &idx)) - return -EINVAL; - - set = (idx == SH_FREQ_MIN) ? MIN_CLOCK_SET : MAX_CLOCK_SET; - - sh_cpufreq_setstate(policy->cpu, set); - - return 0; -} - -static struct cpufreq_driver sh_cpufreq_driver = { - .owner = THIS_MODULE, - .name = "SH cpufreq", - .init = sh_cpufreq_cpu_init, - .verify = sh_cpufreq_verify, - .target = sh_cpufreq_target, -}; - -static int __init sh_cpufreq_init(void) -{ - if (!current_cpu_data.cpu_clock) - return -EINVAL; - if (cpufreq_register_driver(&sh_cpufreq_driver)) - return -EINVAL; - - return 0; -} - -static void __exit sh_cpufreq_exit(void) -{ - cpufreq_unregister_driver(&sh_cpufreq_driver); -} - -module_init(sh_cpufreq_init); -module_exit(sh_cpufreq_exit); - -MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>"); -MODULE_DESCRIPTION("cpufreq driver for SuperH"); -MODULE_LICENSE("GPL"); - |