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linux/drivers/cpufreq/pxa3xx-cpufreq.c
Viresh Kumar 9c0ebcf78f cpufreq: Implement light weight ->target_index() routine 
Currently, the prototype of cpufreq_drivers target routines is:

int target(struct cpufreq_policy *policy, unsigned int target_freq,
		unsigned int relation);

And most of the drivers call cpufreq_frequency_table_target() to get a valid
index of their frequency table which is closest to the target_freq. And they
don't use target_freq and relation after that.

So, it makes sense to just do this work in cpufreq core before calling
cpufreq_frequency_table_target() and simply pass index instead. But this can be
done only with drivers which expose their frequency table with cpufreq core. For
others we need to stick with the old prototype of target() until those drivers
are converted to expose frequency tables.

This patch implements the new light weight prototype for target_index() routine.
It looks like this:

int target_index(struct cpufreq_policy *policy, unsigned int index);

CPUFreq core will call cpufreq_frequency_table_target() before calling this
routine and pass index to it. Because CPUFreq core now requires to call routines
present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time.

This also marks target() interface as deprecated. So, that new drivers avoid
using it. And Documentation is updated accordingly.

It also converts existing .target() to newly defined light weight
.target_index() routine for many driver.

Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
2013-10-25 22:42:24 +02:00

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/*
* Copyright (C) 2008 Marvell International Ltd.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/generic.h>
#include <mach/pxa3xx-regs.h>
#define HSS_104M (0)
#define HSS_156M (1)
#define HSS_208M (2)
#define HSS_312M (3)
#define SMCFS_78M (0)
#define SMCFS_104M (2)
#define SMCFS_208M (5)
#define SFLFS_104M (0)
#define SFLFS_156M (1)
#define SFLFS_208M (2)
#define SFLFS_312M (3)
#define XSPCLK_156M (0)
#define XSPCLK_NONE (3)
#define DMCFS_26M (0)
#define DMCFS_260M (3)
struct pxa3xx_freq_info {
unsigned int cpufreq_mhz;
unsigned int core_xl : 5;
unsigned int core_xn : 3;
unsigned int hss : 2;
unsigned int dmcfs : 2;
unsigned int smcfs : 3;
unsigned int sflfs : 2;
unsigned int df_clkdiv : 3;
int vcc_core; /* in mV */
int vcc_sram; /* in mV */
};
#define OP(cpufreq, _xl, _xn, _hss, _dmc, _smc, _sfl, _dfi, vcore, vsram) \
{ \
.cpufreq_mhz = cpufreq, \
.core_xl = _xl, \
.core_xn = _xn, \
.hss = HSS_##_hss##M, \
.dmcfs = DMCFS_##_dmc##M, \
.smcfs = SMCFS_##_smc##M, \
.sflfs = SFLFS_##_sfl##M, \
.df_clkdiv = _dfi, \
.vcc_core = vcore, \
.vcc_sram = vsram, \
}
static struct pxa3xx_freq_info pxa300_freqs[] = {
/* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */
OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */
OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */
OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */
OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */
};
static struct pxa3xx_freq_info pxa320_freqs[] = {
/* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */
OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */
OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */
OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */
OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */
OP(806, 31, 2, 208, 260, 208, 312, 3, 1400, 1400), /* 806MHz */
};
static unsigned int pxa3xx_freqs_num;
static struct pxa3xx_freq_info *pxa3xx_freqs;
static struct cpufreq_frequency_table *pxa3xx_freqs_table;
static int setup_freqs_table(struct cpufreq_policy *policy,
struct pxa3xx_freq_info *freqs, int num)
{
struct cpufreq_frequency_table *table;
int i;
table = kzalloc((num + 1) * sizeof(*table), GFP_KERNEL);
if (table == NULL)
return -ENOMEM;
for (i = 0; i < num; i++) {
table[i].driver_data = i;
table[i].frequency = freqs[i].cpufreq_mhz * 1000;
}
table[num].driver_data = i;
table[num].frequency = CPUFREQ_TABLE_END;
pxa3xx_freqs = freqs;
pxa3xx_freqs_num = num;
pxa3xx_freqs_table = table;
return cpufreq_table_validate_and_show(policy, table);
}
static void __update_core_freq(struct pxa3xx_freq_info *info)
{
uint32_t mask = ACCR_XN_MASK | ACCR_XL_MASK;
uint32_t accr = ACCR;
uint32_t xclkcfg;
accr &= ~(ACCR_XN_MASK | ACCR_XL_MASK | ACCR_XSPCLK_MASK);
accr |= ACCR_XN(info->core_xn) | ACCR_XL(info->core_xl);
/* No clock until core PLL is re-locked */
accr |= ACCR_XSPCLK(XSPCLK_NONE);
xclkcfg = (info->core_xn == 2) ? 0x3 : 0x2; /* turbo bit */
ACCR = accr;
__asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg));
while ((ACSR & mask) != (accr & mask))
cpu_relax();
}
static void __update_bus_freq(struct pxa3xx_freq_info *info)
{
uint32_t mask;
uint32_t accr = ACCR;
mask = ACCR_SMCFS_MASK | ACCR_SFLFS_MASK | ACCR_HSS_MASK |
ACCR_DMCFS_MASK;
accr &= ~mask;
accr |= ACCR_SMCFS(info->smcfs) | ACCR_SFLFS(info->sflfs) |
ACCR_HSS(info->hss) | ACCR_DMCFS(info->dmcfs);
ACCR = accr;
while ((ACSR & mask) != (accr & mask))
cpu_relax();
}
static unsigned int pxa3xx_cpufreq_get(unsigned int cpu)
{
return pxa3xx_get_clk_frequency_khz(0);
}
static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy, unsigned int index)
{
struct pxa3xx_freq_info *next;
struct cpufreq_freqs freqs;
unsigned long flags;
if (policy->cpu != 0)
return -EINVAL;
next = &pxa3xx_freqs[index];
freqs.old = policy->cur;
freqs.new = next->cpufreq_mhz * 1000;
pr_debug("CPU frequency from %d MHz to %d MHz%s\n",
freqs.old / 1000, freqs.new / 1000,
(freqs.old == freqs.new) ? " (skipped)" : "");
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
local_irq_save(flags);
__update_core_freq(next);
__update_bus_freq(next);
local_irq_restore(flags);
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
static int pxa3xx_cpufreq_init(struct cpufreq_policy *policy)
{
int ret = -EINVAL;
/* set default policy and cpuinfo */
policy->min = policy->cpuinfo.min_freq = 104000;
policy->max = policy->cpuinfo.max_freq =
(cpu_is_pxa320()) ? 806000 : 624000;
policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
if (cpu_is_pxa300() || cpu_is_pxa310())
ret = setup_freqs_table(policy, pxa300_freqs,
ARRAY_SIZE(pxa300_freqs));
if (cpu_is_pxa320())
ret = setup_freqs_table(policy, pxa320_freqs,
ARRAY_SIZE(pxa320_freqs));
if (ret) {
pr_err("failed to setup frequency table\n");
return ret;
}
pr_info("CPUFREQ support for PXA3xx initialized\n");
return 0;
}
static struct cpufreq_driver pxa3xx_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
.target_index = pxa3xx_cpufreq_set,
.init = pxa3xx_cpufreq_init,
.exit = cpufreq_generic_exit,
.get = pxa3xx_cpufreq_get,
.name = "pxa3xx-cpufreq",
};
static int __init cpufreq_init(void)
{
if (cpu_is_pxa3xx())
return cpufreq_register_driver(&pxa3xx_cpufreq_driver);
return 0;
}
module_init(cpufreq_init);
static void __exit cpufreq_exit(void)
{
cpufreq_unregister_driver(&pxa3xx_cpufreq_driver);
}
module_exit(cpufreq_exit);
MODULE_DESCRIPTION("CPU frequency scaling driver for PXA3xx");
MODULE_LICENSE("GPL");
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