d4019f0a92
Most of the drivers do following in their ->target_index() routines: struct cpufreq_freqs freqs; freqs.old = old freq... freqs.new = new freq... cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); /* Change rate here */ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); This is replicated over all cpufreq drivers today and there doesn't exists a good enough reason why this shouldn't be moved to cpufreq core instead. There are few special cases though, like exynos5440, which doesn't do everything on the call to ->target_index() routine and call some kind of bottom halves for doing this work, work/tasklet/etc.. They may continue doing notification from their own code as flag: CPUFREQ_ASYNC_NOTIFICATION is already set for them. All drivers are also modified in this patch to avoid breaking 'git bisect', as double notification would happen otherwise. 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: Stephen Warren <swarren@nvidia.com> Tested-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org> Reviewed-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <hwregs/reg_map.h>
|
|
#include <hwregs/reg_rdwr.h>
|
|
#include <hwregs/clkgen_defs.h>
|
|
#include <hwregs/ddr2_defs.h>
|
|
|
|
static int
|
|
cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
|
|
void *data);
|
|
|
|
static struct notifier_block cris_sdram_freq_notifier_block = {
|
|
.notifier_call = cris_sdram_freq_notifier
|
|
};
|
|
|
|
static struct cpufreq_frequency_table cris_freq_table[] = {
|
|
{0x01, 6000},
|
|
{0x02, 200000},
|
|
{0, CPUFREQ_TABLE_END},
|
|
};
|
|
|
|
static unsigned int cris_freq_get_cpu_frequency(unsigned int cpu)
|
|
{
|
|
reg_clkgen_rw_clk_ctrl clk_ctrl;
|
|
clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
|
|
return clk_ctrl.pll ? 200000 : 6000;
|
|
}
|
|
|
|
static int cris_freq_target(struct cpufreq_policy *policy, unsigned int state)
|
|
{
|
|
reg_clkgen_rw_clk_ctrl clk_ctrl;
|
|
clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
|
|
|
|
local_irq_disable();
|
|
|
|
/* Even though we may be SMP they will share the same clock
|
|
* so all settings are made on CPU0. */
|
|
if (cris_freq_table[state].frequency == 200000)
|
|
clk_ctrl.pll = 1;
|
|
else
|
|
clk_ctrl.pll = 0;
|
|
REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
|
|
|
|
local_irq_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cris_freq_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
return cpufreq_generic_init(policy, cris_freq_table, 1000000);
|
|
}
|
|
|
|
static struct cpufreq_driver cris_freq_driver = {
|
|
.get = cris_freq_get_cpu_frequency,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = cris_freq_target,
|
|
.init = cris_freq_cpu_init,
|
|
.exit = cpufreq_generic_exit,
|
|
.name = "cris_freq",
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static int __init cris_freq_init(void)
|
|
{
|
|
int ret;
|
|
ret = cpufreq_register_driver(&cris_freq_driver);
|
|
cpufreq_register_notifier(&cris_sdram_freq_notifier_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
|
|
void *data)
|
|
{
|
|
int i;
|
|
struct cpufreq_freqs *freqs = data;
|
|
if (val == CPUFREQ_PRECHANGE) {
|
|
reg_ddr2_rw_cfg cfg =
|
|
REG_RD(ddr2, regi_ddr2_ctrl, rw_cfg);
|
|
cfg.ref_interval = (freqs->new == 200000 ? 1560 : 46);
|
|
|
|
if (freqs->new == 200000)
|
|
for (i = 0; i < 50000; i++);
|
|
REG_WR(bif_core, regi_bif_core, rw_sdram_timing, timing);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
module_init(cris_freq_init);
|