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drivers/cpufreq/blackfin-cpufreq.c
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/* |
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* Blackfin core clock scaling |
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* |
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* Copyright 2008-2011 Analog Devices Inc. |
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* |
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* Licensed under the GPL-2 or later. |
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*/ #include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/types.h> #include <linux/init.h> |
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#include <linux/clk.h> |
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#include <linux/cpufreq.h> #include <linux/fs.h> |
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#include <linux/delay.h> |
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#include <asm/blackfin.h> #include <asm/time.h> |
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#include <asm/dpmc.h> |
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/* this is the table of CCLK frequencies, in Hz */ |
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/* .driver_data is the entry in the auxiliary dpm_state_table[] */ |
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static struct cpufreq_frequency_table bfin_freq_table[] = { { .frequency = CPUFREQ_TABLE_END, |
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.driver_data = 0, |
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}, { .frequency = CPUFREQ_TABLE_END, |
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.driver_data = 1, |
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}, { .frequency = CPUFREQ_TABLE_END, |
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.driver_data = 2, |
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}, { .frequency = CPUFREQ_TABLE_END, |
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.driver_data = 0, |
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}, }; static struct bfin_dpm_state { unsigned int csel; /* system clock divider */ unsigned int tscale; /* change the divider on the core timer interrupt */ } dpm_state_table[3]; |
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#if defined(CONFIG_CYCLES_CLOCKSOURCE) |
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/* |
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* normalized to maximum frequency offset for CYCLES, |
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* used in time-ts cycles clock source, but could be used * somewhere also. |
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*/ unsigned long long __bfin_cycles_off; unsigned int __bfin_cycles_mod; |
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#endif |
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/**************************************************************************/ |
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static void __init bfin_init_tables(unsigned long cclk, unsigned long sclk) { |
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unsigned long csel, min_cclk; int index; /* Anomaly 273 seems to still exist on non-BF54x w/dcache turned on */ #if ANOMALY_05000273 || ANOMALY_05000274 || \ |
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(!(defined(CONFIG_BF54x) || defined(CONFIG_BF60x)) \ && defined(CONFIG_BFIN_EXTMEM_DCACHEABLE)) |
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min_cclk = sclk * 2; #else min_cclk = sclk; #endif |
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#ifndef CONFIG_BF60x |
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csel = ((bfin_read_PLL_DIV() & CSEL) >> 4); |
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#else csel = bfin_read32(CGU0_DIV) & 0x1F; #endif |
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for (index = 0; (cclk >> index) >= min_cclk && csel <= 3 && index < 3; index++, csel++) { |
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bfin_freq_table[index].frequency = cclk >> index; |
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#ifndef CONFIG_BF60x |
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dpm_state_table[index].csel = csel << 4; /* Shift now into PLL_DIV bitpos */ |
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#else dpm_state_table[index].csel = csel; |
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#endif |
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dpm_state_table[index].tscale = (TIME_SCALE >> index) - 1; |
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pr_debug("cpufreq: freq:%d csel:0x%x tscale:%d ", bfin_freq_table[index].frequency, dpm_state_table[index].csel, dpm_state_table[index].tscale); } return; } static void bfin_adjust_core_timer(void *info) |
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{ |
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unsigned int tscale; unsigned int index = *(unsigned int *)info; /* we have to adjust the core timer, because it is using cclk */ tscale = dpm_state_table[index].tscale; bfin_write_TSCALE(tscale); return; } |
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static unsigned int bfin_getfreq_khz(unsigned int cpu) { /* Both CoreA/B have the same core clock */ |
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return get_cclk() / 1000; |
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} |
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#ifdef CONFIG_BF60x |
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static int cpu_set_cclk(int cpu, unsigned long new) |
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{ struct clk *clk; int ret; clk = clk_get(NULL, "CCLK"); if (IS_ERR(clk)) return -ENODEV; ret = clk_set_rate(clk, new); clk_put(clk); return ret; } |
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#endif |
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static int bfin_target(struct cpufreq_policy *policy, unsigned int index) |
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{ |
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#ifndef CONFIG_BF60x unsigned int plldiv; #endif |
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static unsigned long lpj_ref; static unsigned int lpj_ref_freq; |
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unsigned int old_freq, new_freq; |
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int ret = 0; |
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#if defined(CONFIG_CYCLES_CLOCKSOURCE) |
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cycles_t cycles; |
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#endif |
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old_freq = bfin_getfreq_khz(0); new_freq = bfin_freq_table[index].frequency; |
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#ifndef CONFIG_BF60x |
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plldiv = (bfin_read_PLL_DIV() & SSEL) | dpm_state_table[index].csel; bfin_write_PLL_DIV(plldiv); |
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#else |
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ret = cpu_set_cclk(policy->cpu, new_freq * 1000); |
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if (ret != 0) { WARN_ONCE(ret, "cpufreq set freq failed %d ", ret); return ret; } |
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#endif |
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on_each_cpu(bfin_adjust_core_timer, &index, 1); |
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#if defined(CONFIG_CYCLES_CLOCKSOURCE) |
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cycles = get_cycles(); SSYNC(); cycles += 10; /* ~10 cycles we lose after get_cycles() */ __bfin_cycles_off += (cycles << __bfin_cycles_mod) - (cycles << index); __bfin_cycles_mod = index; |
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#endif |
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if (!lpj_ref_freq) { lpj_ref = loops_per_jiffy; |
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lpj_ref_freq = old_freq; |
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} |
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if (new_freq != old_freq) { |
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loops_per_jiffy = cpufreq_scale(lpj_ref, |
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lpj_ref_freq, new_freq); |
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} |
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return ret; |
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} |
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static int __bfin_cpu_init(struct cpufreq_policy *policy) |
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{ |
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unsigned long cclk, sclk; |
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cclk = get_cclk() / 1000; sclk = get_sclk() / 1000; |
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if (policy->cpu == CPUFREQ_CPU) bfin_init_tables(cclk, sclk); |
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policy->cpuinfo.transition_latency = 50000; /* 50us assumed */ |
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return cpufreq_table_validate_and_show(policy, bfin_freq_table); |
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} |
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static struct cpufreq_driver bfin_driver = { |
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.verify = cpufreq_generic_frequency_table_verify, |
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.target_index = bfin_target, |
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.get = bfin_getfreq_khz, |
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.init = __bfin_cpu_init, .name = "bfin cpufreq", |
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.attr = cpufreq_generic_attr, |
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}; static int __init bfin_cpu_init(void) { return cpufreq_register_driver(&bfin_driver); } static void __exit bfin_cpu_exit(void) { cpufreq_unregister_driver(&bfin_driver); } MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("cpufreq driver for Blackfin"); MODULE_LICENSE("GPL"); module_init(bfin_cpu_init); module_exit(bfin_cpu_exit); |