From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Magnus Damm <magnus.damm@gmail.com>
Cc: linux-renesas-soc@vger.kernel.org,
Geert Uytterhoeven <geert+renesas@glider.be>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 4/4] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs
Date: Wed, 11 Dec 2019 14:52:22 +0100 [thread overview]
Message-ID: <20191211135222.26770-5-geert+renesas@glider.be> (raw)
In-Reply-To: <20191211135222.26770-1-geert+renesas@glider.be>
SH-Mobile AG5 and R-Car H1 SoCs are based on the Cortex-A9 MPCore, which
includes a global timer.
Enable the ARM global timer on these SoCs, which will be used for:
- the scheduler clock, improving scheduler accuracy from 10 ms to 3 or
4 ns,
- delay loops, allowing removal of calls to shmobile_init_delay() from
the corresponding machine vectors.
Note that when using an old DTB lacking the global timer, the kernel
will still work. However, loops-per-jiffies will no longer be preset,
and the delay loop will need to be calibrated during boot.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
- Rebased
---
arch/arm/mach-shmobile/setup-r8a7779.c | 1 -
arch/arm/mach-shmobile/setup-sh73a0.c | 1 -
drivers/soc/renesas/Kconfig | 2 ++
3 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-shmobile/setup-r8a7779.c b/arch/arm/mach-shmobile/setup-r8a7779.c
index b13ec9088ce5354c..86406e3f9b22e31f 100644
--- a/arch/arm/mach-shmobile/setup-r8a7779.c
+++ b/arch/arm/mach-shmobile/setup-r8a7779.c
@@ -72,7 +72,6 @@ static const char *const r8a7779_compat_dt[] __initconst = {
DT_MACHINE_START(R8A7779_DT, "Generic R8A7779 (Flattened Device Tree)")
.smp = smp_ops(r8a7779_smp_ops),
.map_io = r8a7779_map_io,
- .init_early = shmobile_init_delay,
.init_irq = r8a7779_init_irq_dt,
.init_late = shmobile_init_late,
.dt_compat = r8a7779_compat_dt,
diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
index 4b7d07a36a24aa75..cac92edd2b8879cc 100644
--- a/arch/arm/mach-shmobile/setup-sh73a0.c
+++ b/arch/arm/mach-shmobile/setup-sh73a0.c
@@ -56,7 +56,6 @@ static const char *const sh73a0_boards_compat_dt[] __initconst = {
DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)")
.smp = smp_ops(sh73a0_smp_ops),
.map_io = sh73a0_map_io,
- .init_early = shmobile_init_delay,
.init_machine = sh73a0_generic_init,
.init_late = shmobile_init_late,
.dt_compat = sh73a0_boards_compat_dt,
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 2d10e34cdbe4d117..f87a7466171c5eba 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -116,6 +116,7 @@ config ARCH_R8A7779
bool "R-Car H1 (R8A77790)"
select ARCH_RCAR_GEN1
select ARM_ERRATA_754322
+ select ARM_GLOBAL_TIMER
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP
select SYSC_R8A7779
@@ -163,6 +164,7 @@ config ARCH_SH73A0
bool "SH-Mobile AG5 (R8A73A00)"
select ARCH_RMOBILE
select ARM_ERRATA_754322
+ select ARM_GLOBAL_TIMER
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP
select RENESAS_INTC_IRQPIN
--
2.17.1
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prev parent reply other threads:[~2019-12-11 13:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 13:52 [PATCH v2 0/4] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore Geert Uytterhoeven
2019-12-11 13:52 ` [PATCH v2 1/4] ARM: dts: sh73a0: Rename twd clock to periph clock Geert Uytterhoeven
2019-12-11 13:52 ` [PATCH v2 2/4] ARM: dts: sh73a0: Add device node for ARM global timer Geert Uytterhoeven
2019-12-11 13:52 ` [PATCH v2 3/4] ARM: dts: r8a7779: " Geert Uytterhoeven
2019-12-11 13:52 ` Geert Uytterhoeven [this message]
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