diff options
Diffstat (limited to 'drivers/cpufreq/powernow-k6.c')
| -rw-r--r-- | drivers/cpufreq/powernow-k6.c | 76 |
1 files changed, 72 insertions, 4 deletions
diff --git a/drivers/cpufreq/powernow-k6.c b/drivers/cpufreq/powernow-k6.c index ee5e2530cf90..5e6565811663 100644 --- a/drivers/cpufreq/powernow-k6.c +++ b/drivers/cpufreq/powernow-k6.c @@ -26,6 +26,14 @@ static unsigned int busfreq; /* FSB, in 10 kHz */ static unsigned int max_multiplier; +static unsigned int param_busfreq = 0; +static unsigned int param_max_multiplier = 0; + +module_param_named(max_multiplier, param_max_multiplier, uint, S_IRUGO); +MODULE_PARM_DESC(max_multiplier, "Maximum multiplier (allowed values: 20 30 35 40 45 50 55 60)"); + +module_param_named(bus_frequency, param_busfreq, uint, S_IRUGO); +MODULE_PARM_DESC(bus_frequency, "Bus frequency in kHz"); /* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */ static struct cpufreq_frequency_table clock_ratio[] = { @@ -40,6 +48,27 @@ static struct cpufreq_frequency_table clock_ratio[] = { {0, CPUFREQ_TABLE_END} }; +static const struct { + unsigned freq; + unsigned mult; +} usual_frequency_table[] = { + { 400000, 40 }, // 100 * 4 + { 450000, 45 }, // 100 * 4.5 + { 475000, 50 }, // 95 * 5 + { 500000, 50 }, // 100 * 5 + { 506250, 45 }, // 112.5 * 4.5 + { 533500, 55 }, // 97 * 5.5 + { 550000, 55 }, // 100 * 5.5 + { 562500, 50 }, // 112.5 * 5 + { 570000, 60 }, // 95 * 6 + { 600000, 60 }, // 100 * 6 + { 618750, 55 }, // 112.5 * 5.5 + { 660000, 55 }, // 120 * 5.5 + { 675000, 60 }, // 112.5 * 6 + { 720000, 60 }, // 120 * 6 +}; + +#define FREQ_RANGE 3000 /** * powernow_k6_get_cpu_multiplier - returns the current FSB multiplier @@ -163,18 +192,57 @@ static int powernow_k6_target(struct cpufreq_policy *policy, return 0; } - static int powernow_k6_cpu_init(struct cpufreq_policy *policy) { unsigned int i, f; int result; + unsigned khz; if (policy->cpu != 0) return -ENODEV; - /* get frequencies */ - max_multiplier = powernow_k6_get_cpu_multiplier(); - busfreq = cpu_khz / max_multiplier; + max_multiplier = 0; + khz = cpu_khz; + for (i = 0; i < ARRAY_SIZE(usual_frequency_table); i++) { + if (khz >= usual_frequency_table[i].freq - FREQ_RANGE && + khz <= usual_frequency_table[i].freq + FREQ_RANGE) { + khz = usual_frequency_table[i].freq; + max_multiplier = usual_frequency_table[i].mult; + break; + } + } + if (param_max_multiplier) { + for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) { + if (clock_ratio[i].index == param_max_multiplier) { + max_multiplier = param_max_multiplier; + goto have_max_multiplier; + } + } + printk(KERN_ERR "powernow-k6: invalid max_multiplier parameter, valid parameters 20, 30, 35, 40, 45, 50, 55, 60\n"); + return -EINVAL; + } + + if (!max_multiplier) { + printk(KERN_WARNING "powernow-k6: unknown frequency %u, cannot determine current multiplier\n", khz); + printk(KERN_WARNING "powernow-k6: use module parameters max_multiplier and bus_frequency\n"); + return -EOPNOTSUPP; + } + +have_max_multiplier: + param_max_multiplier = max_multiplier; + + if (param_busfreq) { + if (param_busfreq >= 50000 && param_busfreq <= 150000) { + busfreq = param_busfreq / 10; + goto have_busfreq; + } + printk(KERN_ERR "powernow-k6: invalid bus_frequency parameter, allowed range 50000 - 150000 kHz\n"); + return -EINVAL; + } + + busfreq = khz / max_multiplier; +have_busfreq: + param_busfreq = busfreq * 10; /* table init */ for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) { |