Release 4.18 drivers/cpufreq/pxa2xx-cpufreq.c

/*
 *  Copyright (C) 2002,2003 Intrinsyc Software
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 *   31-Jul-2002 : Initial version [FB]
 *   29-Jan-2003 : added PXA255 support [FB]
 *   20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
 *
 * Note:
 *   This driver may change the memory bus clock rate, but will not do any
 *   platform specific access timing changes... for example if you have flash
 *   memory connected to CS0, you will need to register a platform specific
 *   notifier which will adjust the memory access strobes to maintain a
 *   minimum strobe width.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/io.h>

#include <mach/pxa2xx-regs.h>
#include <mach/smemc.h>

#ifdef DEBUG

static unsigned int freq_debug;
module_param(freq_debug, uint, 0);
MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
#else

#define freq_debug  0
#endif


static struct regulator *vcc_core;


static unsigned int pxa27x_maxfreq;
module_param(pxa27x_maxfreq, uint, 0);
MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
		 "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");


struct pxa_cpufreq_data {
	
struct clk *clk_core;
};

static struct pxa_cpufreq_data  pxa_cpufreq_data;


struct pxa_freqs {
	
unsigned int khz;
	
int vmin;
	
int vmax;
};

/*
 * PXA255 definitions
 */

static const struct pxa_freqs pxa255_run_freqs[] =
{
	/* CPU   MEMBUS            run  turbo PXbus SDRAM */
	{ 99500, -1, -1},	/*  99,   99,   50,   50  */
	{132700, -1, -1},	/* 133,  133,   66,   66  */
	{199100, -1, -1},	/* 199,  199,   99,   99  */
	{265400, -1, -1},	/* 265,  265,  133,   66  */
	{331800, -1, -1},	/* 331,  331,  166,   83  */
	{398100, -1, -1},	/* 398,  398,  196,   99  */
};

/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */

static const struct pxa_freqs pxa255_turbo_freqs[] =
{
	/* CPU                     run  turbo PXbus SDRAM */
	{ 99500, -1, -1},	/*  99,   99,   50,   50  */
	{199100, -1, -1},	/*  99,  199,   50,   99  */
	{298500, -1, -1},	/*  99,  287,   50,   99  */
	{298600, -1, -1},	/* 199,  287,   99,   99  */
	{398100, -1, -1},	/* 199,  398,   99,   99  */
};


#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)

#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)

static struct cpufreq_frequency_table
	
pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
static struct cpufreq_frequency_table
	
pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];


static unsigned int pxa255_turbo_table;
module_param(pxa255_turbo_table, uint, 0);
MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");


static struct pxa_freqs pxa27x_freqs[] = {
	{104000,  900000, 1705000 },
	{156000, 1000000, 1705000 },
	{208000, 1180000, 1705000 },
	{312000, 1250000, 1705000 },
	{416000, 1350000, 1705000 },
	{520000, 1450000, 1705000 },
	{624000, 1550000, 1705000 }
};


#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
static struct cpufreq_frequency_table
	
pxa27x_freq_table[NUM_PXA27x_FREQS+1];

extern unsigned get_clk_frequency_khz(int info);

#ifdef CONFIG_REGULATOR



static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
{
	int ret = 0;
	int vmin, vmax;

	if (!cpu_is_pxa27x())
		return 0;

	vmin = pxa_freq->vmin;
	vmax = pxa_freq->vmax;
	if ((vmin == -1) || (vmax == -1))
		return 0;

	ret = regulator_set_voltage(vcc_core, vmin, vmax);
	if (ret)
		pr_err("Failed to set vcc_core in [%dmV..%dmV]\n", vmin, vmax);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
85
95.51%
1
25.00%
Fabian Frederick
3
3.37%
2
50.00%
Joe Perches
1
1.12%
1
25.00%
Total
89
100.00%
4
100.00%



static void __init pxa_cpufreq_init_voltages(void)
{
	vcc_core = regulator_get(NULL, "vcc_core");
	if (IS_ERR(vcc_core)) {
		pr_info("Didn't find vcc_core regulator\n");
		vcc_core = NULL;
	} else {
		pr_info("Found vcc_core regulator\n");
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
41
93.18%
1
33.33%
Joe Perches
2
4.55%
1
33.33%
Hanjun Guo
1
2.27%
1
33.33%
Total
44
100.00%
3
100.00%

#else


static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
12
80.00%
1
33.33%
Fabian Frederick
2
13.33%
1
33.33%
Arnd Bergmann
1
6.67%
1
33.33%
Total
15
100.00%
3
100.00%



static void __init pxa_cpufreq_init_voltages(void) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
7
87.50%
1
50.00%
Hanjun Guo
1
12.50%
1
50.00%
Total
8
100.00%
2
100.00%

#endif



static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
			     const struct pxa_freqs **pxa_freqs)
{
	if (cpu_is_pxa25x()) {
		if (!pxa255_turbo_table) {
			*pxa_freqs = pxa255_run_freqs;
			*freq_table = pxa255_run_freq_table;
		} else {
			*pxa_freqs = pxa255_turbo_freqs;
			*freq_table = pxa255_turbo_freq_table;
		}
	} else if (cpu_is_pxa27x()) {
		*pxa_freqs = pxa27x_freqs;
		*freq_table = pxa27x_freq_table;
	} else {
		BUG();
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
49
61.25%
1
16.67%
Russell King
18
22.50%
1
16.67%
Arnd Bergmann
7
8.75%
1
16.67%
Marc Zyngier
3
3.75%
1
16.67%
Fabian Frederick
3
3.75%
2
33.33%
Total
80
100.00%
6
100.00%



static void pxa27x_guess_max_freq(void)
{
	if (!pxa27x_maxfreq) {
		pxa27x_maxfreq = 416000;
		pr_info("PXA CPU 27x max frequency not defined (pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
			pxa27x_maxfreq);
	} else {
		pxa27x_maxfreq *= 1000;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
31
93.94%
1
50.00%
Joe Perches
2
6.06%
1
50.00%
Total
33
100.00%
2
100.00%



static unsigned int pxa_cpufreq_get(unsigned int cpu)
{
	struct pxa_cpufreq_data *data = cpufreq_get_driver_data();

	return (unsigned int) clk_get_rate(data->clk_core) / 1000;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
26
78.79%
2
40.00%
Philipp Zabel
3
9.09%
1
20.00%
Russell King
2
6.06%
1
20.00%
Marek Vašut
2
6.06%
1
20.00%
Total
33
100.00%
5
100.00%



static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx)
{
	struct cpufreq_frequency_table *pxa_freqs_table;
	const struct pxa_freqs *pxa_freq_settings;
	struct pxa_cpufreq_data *data = cpufreq_get_driver_data();
	unsigned int new_freq_cpu;
	int ret = 0;

	/* Get the current policy */
	find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);

	new_freq_cpu = pxa_freq_settings[idx].khz;

	if (freq_debug)
		pr_debug("Changing CPU frequency from %d Mhz to %d Mhz\n",
			 policy->cur / 1000,  new_freq_cpu / 1000);

	if (vcc_core && new_freq_cpu > policy->cur) {
		ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
		if (ret)
			return ret;
	}

	clk_set_rate(data->clk_core, new_freq_cpu * 1000);

	/*
         * Even if voltage setting fails, we don't report it, as the frequency
         * change succeeded. The voltage reduction is not a critical failure,
         * only power savings will suffer from this.
         *
         * Note: if the voltage change fails, and a return value is returned, a
         * bug is triggered (seems a deadlock). Should anybody find out where,
         * the "return 0" should become a "return ret".
         */
	if (vcc_core && new_freq_cpu < policy->cur)
		ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
81
55.10%
3
33.33%
Russell King
50
34.01%
1
11.11%
Viresh Kumar
11
7.48%
2
22.22%
Fabian Frederick
3
2.04%
2
22.22%
Arnd Bergmann
2
1.36%
1
11.11%
Total
147
100.00%
9
100.00%



static int pxa_cpufreq_init(struct cpufreq_policy *policy)
{
	int i;
	unsigned int freq;
	struct cpufreq_frequency_table *pxa255_freq_table;
	const struct pxa_freqs *pxa255_freqs;

	/* try to guess pxa27x cpu */
	if (cpu_is_pxa27x())
		pxa27x_guess_max_freq();

	pxa_cpufreq_init_voltages();

	/* set default policy and cpuinfo */
	policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */

	/* Generate pxa25x the run cpufreq_frequency_table struct */
	for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
		pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
		pxa255_run_freq_table[i].driver_data = i;
	}
	pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;

	/* Generate pxa25x the turbo cpufreq_frequency_table struct */
	for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
		pxa255_turbo_freq_table[i].frequency =
			pxa255_turbo_freqs[i].khz;
		pxa255_turbo_freq_table[i].driver_data = i;
	}
	pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;

	pxa255_turbo_table = !!pxa255_turbo_table;

	/* Generate the pxa27x cpufreq_frequency_table struct */
	for (i = 0; i < NUM_PXA27x_FREQS; i++) {
		freq = pxa27x_freqs[i].khz;
		if (freq > pxa27x_maxfreq)
			break;
		pxa27x_freq_table[i].frequency = freq;
		pxa27x_freq_table[i].driver_data = i;
	}
	pxa27x_freq_table[i].driver_data = i;
	pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;

	/*
         * Set the policy's minimum and maximum frequencies from the tables
         * just constructed.  This sets cpuinfo.mxx_freq, min and max.
         */
	if (cpu_is_pxa25x()) {
		find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
		pr_info("using %s frequency table\n",
			pxa255_turbo_table ? "turbo" : "run");

		policy->freq_table = pxa255_freq_table;
	}
	else if (cpu_is_pxa27x()) {
		policy->freq_table = pxa27x_freq_table;
	}

	pr_info("frequency change support initialized\n");

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Russell King
120
43.32%
1
8.33%
Robert Jarzmik
95
34.30%
2
16.67%
Marc Zyngier
36
13.00%
1
8.33%
Viresh Kumar
12
4.33%
3
25.00%
Daniel Mack
8
2.89%
1
8.33%
Joe Perches
3
1.08%
2
16.67%
Fabian Frederick
3
1.08%
2
16.67%
Total
277
100.00%
12
100.00%


static struct cpufreq_driver pxa_cpufreq_driver = {
	.flags	= CPUFREQ_NEED_INITIAL_FREQ_CHECK,
	.verify	= cpufreq_generic_frequency_table_verify,
	.target_index = pxa_set_target,
	.init	= pxa_cpufreq_init,
	.get	= pxa_cpufreq_get,
	.name	= "PXA2xx",
	.driver_data = &pxa_cpufreq_data,
};



static int __init pxa_cpu_init(void)
{
	int ret = -ENODEV;

	pxa_cpufreq_data.clk_core = clk_get_sys(NULL, "core");
	if (IS_ERR(pxa_cpufreq_data.clk_core))
		return PTR_ERR(pxa_cpufreq_data.clk_core);

	if (cpu_is_pxa25x() || cpu_is_pxa27x())
		ret = cpufreq_register_driver(&pxa_cpufreq_driver);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
31
50.00%
2
66.67%
Russell King
31
50.00%
1
33.33%
Total
62
100.00%
3
100.00%



static void __exit pxa_cpu_exit(void)
{
	cpufreq_unregister_driver(&pxa_cpufreq_driver);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Russell King
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%

MODULE_AUTHOR("Intrinsyc Software Inc.");
MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
MODULE_LICENSE("GPL");
module_init(pxa_cpu_init);
module_exit(pxa_cpu_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Jarzmik
688
53.50%
4
13.79%
Russell King
428
33.28%
2
6.90%
Marc Zyngier
60
4.67%
1
3.45%
Viresh Kumar
31
2.41%
8
27.59%
Fabian Frederick
24
1.87%
2
6.90%
Joe Perches
15
1.17%
2
6.90%
Arnd Bergmann
10
0.78%
3
10.34%
Daniel Mack
8
0.62%
1
3.45%
Marek Vašut
8
0.62%
2
6.90%
Holger Schurig
5
0.39%
1
3.45%
Randy Dunlap
4
0.31%
1
3.45%
Philipp Zabel
3
0.23%
1
3.45%
Hanjun Guo
2
0.16%
1
3.45%
Total
1286
100.00%
29
100.00%
Directory: drivers/cpufreq

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.