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authorGeert Uytterhoeven <geert+renesas@glider.be>2018-05-30 17:25:13 +0200
committerSimon Horman <horms+renesas@verge.net.au>2018-06-18 12:00:28 +0200
commitf2b1d2f94af887c91bb8a0cfb495e546331bc5ed (patch)
tree566f6763faab4252a9d43f39051750fe59255ca2 /drivers/soc/renesas
parent62f55ce683e3675aa83cc3e912f070aef1baeff8 (diff)
downloadblackbird-obmc-linux-f2b1d2f94af887c91bb8a0cfb495e546331bc5ed.tar.gz
blackbird-obmc-linux-f2b1d2f94af887c91bb8a0cfb495e546331bc5ed.zip
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>
Diffstat (limited to 'drivers/soc/renesas')
-rw-r--r--drivers/soc/renesas/rcar-sysc.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c
index 95120acc4d80..4ad6dcd19420 100644
--- a/drivers/soc/renesas/rcar-sysc.c
+++ b/drivers/soc/renesas/rcar-sysc.c
@@ -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 */
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