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sparc-us3-cpufreq.c


products/Sources/formale Sprachen/C/Linux/drivers/cpufreq/sparc-us3-cpufreq.c

// SPDX-License-Identifier: GPL-2.0-only /* us3_cpufreq.c: UltraSPARC-III cpu frequency support * * Copyright (C) 2003 David S. Miller (davem@redhat.com) * * Many thanks to Dominik Brodowski for fixing up the cpufreq * infrastructure in order to make this driver easier to implement. */ #include #include #include #include #include #include #include #include #include #include struct us3_freq_percpu_info { struct cpufreq_frequency_table table[4]; }; /* Indexed by cpu number. */ static struct us3_freq_percpu_info *us3_freq_table; /* UltraSPARC-III has three dividers: 1, 2, and 32. These are controlled * in the Safari config register. */ #define SAFARI_CFG_DIV_1 0x0000000000000000UL #define SAFARI_CFG_DIV_2 0x0000000040000000UL #define SAFARI_CFG_DIV_32 0x0000000080000000UL #define SAFARI_CFG_DIV_MASK 0x00000000C0000000UL static void read_safari_cfg(void *arg) { unsigned long ret, *val = arg; __asm__ __volatile__("ldxa [%%g0] %1, %0" : "=&r" (ret) : "i" (ASI_SAFARI_CONFIG)); *val = ret; } static void update_safari_cfg(void *arg) { unsigned long reg, *new_bits = arg; read_safari_cfg(®); reg &= ~SAFARI_CFG_DIV_MASK; reg |= *new_bits; __asm__ __volatile__("stxa %0, [%%g0] %1\n\t" "membar #Sync" : /* no outputs */ : "r" (reg), "i" (ASI_SAFARI_CONFIG) : "memory"); } static unsigned long get_current_freq(unsigned int cpu, unsigned long safari_cfg) { unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000; unsigned long ret; switch (safari_cfg & SAFARI_CFG_DIV_MASK) { case SAFARI_CFG_DIV_1: ret = clock_tick / 1; break; case SAFARI_CFG_DIV_2: ret = clock_tick / 2; break; case SAFARI_CFG_DIV_32: ret = clock_tick / 32; break; default: BUG(); } return ret; } static unsigned int us3_freq_get(unsigned int cpu) { unsigned long reg; if (smp_call_function_single(cpu, read_safari_cfg, ®, 1)) return 0; return get_current_freq(cpu, reg); } static int us3_freq_target(struct cpufreq_policy *policy, unsigned int index) { unsigned int cpu = policy->cpu; unsigned long new_bits, new_freq; new_freq = sparc64_get_clock_tick(cpu) / 1000; switch (index) { case 0: new_bits = SAFARI_CFG_DIV_1; new_freq /= 1; break; case 1: new_bits = SAFARI_CFG_DIV_2; new_freq /= 2; break; case 2: new_bits = SAFARI_CFG_DIV_32; new_freq /= 32; break; default: BUG(); } return smp_call_function_single(cpu, update_safari_cfg, &new_bits, 1); } static int us3_freq_cpu_init(struct cpufreq_policy *policy) { unsigned int cpu = policy->cpu; unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000; struct cpufreq_frequency_table *table = &us3_freq_table[cpu].table[0]; table[0].driver_data = 0; table[0].frequency = clock_tick / 1; table[1].driver_data = 1; table[1].frequency = clock_tick / 2; table[2].driver_data = 2; table[2].frequency = clock_tick / 32; table[3].driver_data = 0; table[3].frequency = CPUFREQ_TABLE_END; policy->cpuinfo.transition_latency = 0; policy->cur = clock_tick; policy->freq_table = table; return 0; } static void us3_freq_cpu_exit(struct cpufreq_policy *policy) { us3_freq_target(policy, 0); } static struct cpufreq_driver cpufreq_us3_driver = { .name = "UltraSPARC-III", .init = us3_freq_cpu_init, .verify = cpufreq_generic_frequency_table_verify, .target_index = us3_freq_target, .get = us3_freq_get, .exit = us3_freq_cpu_exit, }; static int __init us3_freq_init(void) { unsigned long manuf, impl, ver; int ret; if (tlb_type != cheetah && tlb_type != cheetah_plus) return -ENODEV; __asm__("rdpr %%ver, %0" : "=r" (ver)); manuf = ((ver >> 48) & 0xffff); impl = ((ver >> 32) & 0xffff); if (manuf == CHEETAH_MANUF && (impl == CHEETAH_IMPL || impl == CHEETAH_PLUS_IMPL || impl == JAGUAR_IMPL || impl == PANTHER_IMPL)) { us3_freq_table = kcalloc(NR_CPUS, sizeof(*us3_freq_table), GFP_KERNEL); if (!us3_freq_table) return -ENOMEM; ret = cpufreq_register_driver(&cpufreq_us3_driver); if (ret) kfree(us3_freq_table); return ret; } return -ENODEV; } static void __exit us3_freq_exit(void) { cpufreq_unregister_driver(&cpufreq_us3_driver); kfree(us3_freq_table); } MODULE_AUTHOR("David S. Miller "); MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-III"); MODULE_LICENSE("GPL"); module_init(us3_freq_init); module_exit(us3_freq_exit);

                                                                                                                                                                                                                                                                                                                                                                                                     

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