[ARM] pxa: add preliminary CPUFREQ support for PXA3xx
Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Eric Miao
Russell King
parent
5c52de4a66
commit
4f788bb200
|
|
@ -10,6 +10,7 @@ obj-$(CONFIG_PM) += pm.o sleep.o standby.o
|
|||
ifeq ($(CONFIG_CPU_FREQ),y)
|
||||
obj-$(CONFIG_PXA25x) += cpufreq-pxa2xx.o
|
||||
obj-$(CONFIG_PXA27x) += cpufreq-pxa2xx.o
|
||||
obj-$(CONFIG_PXA3xx) += cpufreq-pxa3xx.o
|
||||
endif
|
||||
|
||||
# Generic drivers that other drivers may depend upon
|
||||
|
|
|
|||
|
|
@ -0,0 +1,258 @@
|
|||
/*
|
||||
* linux/arch/arm/mach-pxa/cpufreq-pxa3xx.c
|
||||
*
|
||||
* 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 <mach/hardware.h>
|
||||
#include <mach/pxa-regs.h>
|
||||
#include <mach/pxa3xx-regs.h>
|
||||
|
||||
#include "generic.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].index = i;
|
||||
table[i].frequency = freqs[i].cpufreq_mhz * 1000;
|
||||
}
|
||||
table[num].frequency = i;
|
||||
table[num].frequency = CPUFREQ_TABLE_END;
|
||||
|
||||
pxa3xx_freqs = freqs;
|
||||
pxa3xx_freqs_num = num;
|
||||
pxa3xx_freqs_table = table;
|
||||
|
||||
return cpufreq_frequency_table_cpuinfo(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 int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy)
|
||||
{
|
||||
return cpufreq_frequency_table_verify(policy, pxa3xx_freqs_table);
|
||||
}
|
||||
|
||||
static unsigned int pxa3xx_cpufreq_get(unsigned int cpu)
|
||||
{
|
||||
return get_clk_frequency_khz(0);
|
||||
}
|
||||
|
||||
static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy,
|
||||
unsigned int target_freq,
|
||||
unsigned int relation)
|
||||
{
|
||||
struct pxa3xx_freq_info *next;
|
||||
struct cpufreq_freqs freqs;
|
||||
unsigned long flags;
|
||||
int idx;
|
||||
|
||||
if (policy->cpu != 0)
|
||||
return -EINVAL;
|
||||
|
||||
/* Lookup the next frequency */
|
||||
if (cpufreq_frequency_table_target(policy, pxa3xx_freqs_table,
|
||||
target_freq, relation, &idx))
|
||||
return -EINVAL;
|
||||
|
||||
next = &pxa3xx_freqs[idx];
|
||||
|
||||
freqs.old = policy->cur;
|
||||
freqs.new = next->cpufreq_mhz * 1000;
|
||||
freqs.cpu = policy->cpu;
|
||||
|
||||
pr_debug("CPU frequency from %d MHz to %d MHz%s\n",
|
||||
freqs.old / 1000, freqs.new / 1000,
|
||||
(freqs.old == freqs.new) ? " (skipped)" : "");
|
||||
|
||||
if (freqs.old == target_freq)
|
||||
return 0;
|
||||
|
||||
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
||||
|
||||
local_irq_save(flags);
|
||||
__update_core_freq(next);
|
||||
__update_bus_freq(next);
|
||||
local_irq_restore(flags);
|
||||
|
||||
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __init int pxa3xx_cpufreq_init(struct cpufreq_policy *policy)
|
||||
{
|
||||
int ret = -EINVAL;
|
||||
|
||||
/* set default policy and cpuinfo */
|
||||
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
|
||||
policy->cpuinfo.min_freq = 104000;
|
||||
policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000;
|
||||
policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
|
||||
policy->cur = policy->min = policy->max = get_clk_frequency_khz(0);
|
||||
|
||||
if (cpu_is_pxa300() || cpu_is_pxa310())
|
||||
ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs));
|
||||
|
||||
if (cpu_is_pxa320())
|
||||
ret = setup_freqs_table(policy, ARRAY_AND_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 = pxa3xx_cpufreq_verify,
|
||||
.target = pxa3xx_cpufreq_set,
|
||||
.init = pxa3xx_cpufreq_init,
|
||||
.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");
|
||||
Loading…
Reference in New Issue