drivers/cpufreq/powernow-k6.c

1 // SPDX-License-Identifier: GPL-2.0-only
4  *  (C) 2000-2003  Dave Jones, Arjan van de Ven, Janne Pänkälä,
33 MODULE_PARM_DESC(max_multiplier, "Maximum multiplier (allowed values: 20 30 35 40 45 50 55 60)");
38 /* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
40 	{0, 60,  /* 110 -> 6.0x */ 0},
41 	{0, 55,  /* 011 -> 5.5x */ 0},
42 	{0, 50,  /* 001 -> 5.0x */ 0},
43 	{0, 45,  /* 000 -> 4.5x */ 0},
44 	{0, 40,  /* 010 -> 4.0x */ 0},
45 	{0, 35,  /* 111 -> 3.5x */ 0},
46 	{0, 30,  /* 101 -> 3.0x */ 0},
47 	{0, 20,  /* 100 -> 2.0x */ 0},
60 	{ 450000, 45 }, // 100   * 4.5
63 	{ 506250, 45 }, // 112.5 * 4.5
78  * powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
81  * speed is frequency of the Front-Side Bus multiplied with this value.
134  * powernow_k6_target - set the PowerNow! multiplier
145 		return -EINVAL;  in powernow_k6_target()
159 	if (policy->cpu != 0)  in powernow_k6_cpu_init()
160 		return -ENODEV;  in powernow_k6_cpu_init()
165 		if (khz >= usual_frequency_table[i].freq - FREQ_RANGE &&  in powernow_k6_cpu_init()
174 			if (pos->driver_data == param_max_multiplier) {  in powernow_k6_cpu_init()
178 		pr_err("invalid max_multiplier parameter, valid parameters 20, 30, 35, 40, 45, 50, 55, 60\n");  in powernow_k6_cpu_init()
179 		return -EINVAL;  in powernow_k6_cpu_init()
186 		return -EOPNOTSUPP;  in powernow_k6_cpu_init()
197 		pr_err("invalid bus_frequency parameter, allowed range 50000 - 150000 kHz\n");  in powernow_k6_cpu_init()
198 		return -EINVAL;  in powernow_k6_cpu_init()
207 		f = pos->driver_data;  in powernow_k6_cpu_init()
209 			pos->frequency = CPUFREQ_ENTRY_INVALID;  in powernow_k6_cpu_init()
211 			pos->frequency = busfreq * f;  in powernow_k6_cpu_init()
215 	policy->cpuinfo.transition_latency = 500000;  in powernow_k6_cpu_init()
216 	policy->freq_table = clock_ratio;  in powernow_k6_cpu_init()
230 			freqs.old = policy->cur;  in powernow_k6_cpu_exit()
255 	.name		= "powernow-k6",
267  * powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
269  *   Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
270  * devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
276 		return -ENODEV;  in powernow_k6_init()
280 		return -EIO;  in powernow_k6_init()
285 		return -EINVAL;  in powernow_k6_init()
293  * powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
295  *   Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
306 MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");