[PATCH/RFC 4/4] [WIP] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs
From: geert+renesas@glider.be (Geert Uytterhoeven)
Date: 2018-07-31 16:08:55
Also in:
linux-devicetree, linux-renesas-soc
Subsystem:
arm port, arm/risc-v/renesas architecture, the rest · Maintainers:
Russell King, Geert Uytterhoeven, Magnus Damm, Linus Torvalds
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>
---
arch/arm/mach-shmobile/Kconfig | 2 ++
arch/arm/mach-shmobile/setup-r8a7779.c | 1 -
arch/arm/mach-shmobile/setup-sh73a0.c | 1 -
3 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 94e9431d92b87405..d39ab39bba92b124 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig@@ -92,6 +92,7 @@ config ARCH_R8A7778 config ARCH_R8A7779 bool "R-Car H1 (R8A77790)" + select ARM_GLOBAL_TIMER select ARCH_RCAR_GEN1 config ARCH_R8A7790
@@ -133,5 +134,6 @@ config ARCH_RZN1 config ARCH_SH73A0 bool "SH-Mobile AG5 (R8A73A00)" select ARCH_RMOBILE + select ARM_GLOBAL_TIMER select RENESAS_INTC_IRQPIN endif
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 cc08aa752244764a..eb4a62fa42895ebe 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,
--
2.17.1