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soc: renesas: rcar-sysc: Provide helpers to power up/down CPUs 

Provide helpers to control CPU power areas from platform code, taking
just a CPU index.  This will avoid having to pass full CPU power area
parameter blocks, and thus duplicating information already provided by
SoC-specific SYSC drivers.

This will be used on R-Car H1 only.
Later R-Car generations rely on APMU/RST for CPU power area control.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2018-05-30 17:25:13 +02:00 committed by Simon Horman
parent 62f55ce683
commit f2b1d2f94a
2 changed files with 42 additions and 0 deletions
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40
drivers/soc/renesas/rcar-sysc.c
View File

@ -310,6 +310,8 @@ struct rcar_pm_domains {
struct generic_pm_domain *domains[RCAR_PD_ALWAYS_ON + 1];
};
static struct genpd_onecell_data *rcar_sysc_onecell_data;
static int __init rcar_sysc_pd_init(void)
{
const struct rcar_sysc_info *info;
@ -356,6 +358,7 @@ static int __init rcar_sysc_pd_init(void)
domains->onecell_data.domains = domains->domains;
domains->onecell_data.num_domains = ARRAY_SIZE(domains->domains);
rcar_sysc_onecell_data = &domains->onecell_data;
for (i = 0, syscier = 0; i < info->num_areas; i++)
syscier |= BIT(info->areas[i].isr_bit);
@ -449,3 +452,40 @@ void __init rcar_sysc_init(phys_addr_t base, u32 syscier)
pr_debug("%s: syscier = 0x%08x\n", __func__, syscier);
iowrite32(syscier, rcar_sysc_base + SYSCIER);
}
#ifdef CONFIG_ARCH_R8A7779
static int rcar_sysc_power_cpu(unsigned int idx, bool on)
{
struct generic_pm_domain *genpd;
struct rcar_sysc_pd *pd;
unsigned int i;
if (!rcar_sysc_onecell_data)
return -ENODEV;
for (i = 0; i < rcar_sysc_onecell_data->num_domains; i++) {
genpd = rcar_sysc_onecell_data->domains[i];
if (!genpd)
continue;
pd = to_rcar_pd(genpd);
if (!(pd->flags & PD_CPU) || pd->ch.chan_bit != idx)
continue;
return on ? rcar_sysc_power_up(&pd->ch)
: rcar_sysc_power_down(&pd->ch);
}
return -ENOENT;
}
int rcar_sysc_power_down_cpu(unsigned int cpu)
{
return rcar_sysc_power_cpu(cpu, false);
}
int rcar_sysc_power_up_cpu(unsigned int cpu)
{
return rcar_sysc_power_cpu(cpu, true);
}
#endif /* CONFIG_ARCH_R8A7779 */

2
include/linux/soc/renesas/rcar-sysc.h
View File

@ -13,5 +13,7 @@ struct rcar_sysc_ch {
int rcar_sysc_power_down(const struct rcar_sysc_ch *sysc_ch);
int rcar_sysc_power_up(const struct rcar_sysc_ch *sysc_ch);
void rcar_sysc_init(phys_addr_t base, u32 syscier);
int rcar_sysc_power_down_cpu(unsigned int cpu);
int rcar_sysc_power_up_cpu(unsigned int cpu);
#endif /* __LINUX_SOC_RENESAS_RCAR_SYSC_H__ */