From: Geert Uytterhoeven <geert+renesas@glider.be> To: Magnus Damm <magnus.damm@gmail.com> Cc: linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Geert Uytterhoeven <geert+renesas@glider.be> 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
WARNING: multiple messages have this Message-ID (diff)
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-12-11 13:52 UTC|newest] Thread overview: 10+ 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 ` 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 ` 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 ` Geert Uytterhoeven 2019-12-11 13:52 ` [PATCH v2 3/4] ARM: dts: r8a7779: " Geert Uytterhoeven 2019-12-11 13:52 ` Geert Uytterhoeven 2019-12-11 13:52 ` Geert Uytterhoeven [this message] 2019-12-11 13:52 ` [PATCH v2 4/4] ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs Geert Uytterhoeven
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