| Message ID | 20230303133647.845095-18-sunilvl@ventanamicro.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add basic ACPI support for RISC-V | expand |
On Fri, Mar 03, 2023 at 07:06:44PM +0530, Sunil V L wrote: > On ACPI based platforms, timer related information is > available in RHCT. Add ACPI based probe support to the > timer initialization. > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > Reviewed-by: Andrew Jones <ajones@ventanamicro.com> > --- > arch/riscv/kernel/time.c | 23 +++++++++++++++++------ > 1 file changed, 17 insertions(+), 6 deletions(-) > > diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c > index babaf3b48ba8..2c29543549c3 100644 > --- a/arch/riscv/kernel/time.c > +++ b/arch/riscv/kernel/time.c > @@ -4,6 +4,7 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/acpi.h> > #include <linux/of_clk.h> > #include <linux/clockchips.h> > #include <linux/clocksource.h> > @@ -18,17 +19,27 @@ EXPORT_SYMBOL_GPL(riscv_timebase); > void __init time_init(void) > { > struct device_node *cpu; > + struct acpi_table_rhct *rhct; > + acpi_status status; > u32 prop; > > - cpu = of_find_node_by_path("/cpus"); > - if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) > - panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); > - of_node_put(cpu); > - riscv_timebase = prop; > + if (acpi_disabled) { > + cpu = of_find_node_by_path("/cpus"); > + if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) > + panic("RISC-V system with no 'timebase-frequency' in DTS\n"); I appreciate that it was like this before, but a newline here (and in the corresponding spot below) would be nice. That's a minor nit though, so: Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Thanks, Conor. > + of_node_put(cpu); > + riscv_timebase = prop; > + of_clk_init(NULL); > + } else { > + status = acpi_get_table(ACPI_SIG_RHCT, 0, (struct acpi_table_header **)&rhct); > + if (ACPI_FAILURE(status)) > + panic("RISC-V ACPI system with no RHCT table\n"); > + riscv_timebase = rhct->time_base_freq; > + acpi_put_table((struct acpi_table_header *)rhct); > + } > > lpj_fine = riscv_timebase / HZ; > > - of_clk_init(NULL); > timer_probe(); > > tick_setup_hrtimer_broadcast(); > -- > 2.34.1 >
On Mon, Mar 06, 2023 at 09:09:11PM +0000, Conor Dooley wrote: > On Fri, Mar 03, 2023 at 07:06:44PM +0530, Sunil V L wrote: > > On ACPI based platforms, timer related information is > > available in RHCT. Add ACPI based probe support to the > > timer initialization. > > > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> > > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Reviewed-by: Andrew Jones <ajones@ventanamicro.com> > > --- > > arch/riscv/kernel/time.c | 23 +++++++++++++++++------ > > 1 file changed, 17 insertions(+), 6 deletions(-) > > > > diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c > > index babaf3b48ba8..2c29543549c3 100644 > > --- a/arch/riscv/kernel/time.c > > +++ b/arch/riscv/kernel/time.c > > @@ -4,6 +4,7 @@ > > * Copyright (C) 2017 SiFive > > */ > > > > +#include <linux/acpi.h> > > #include <linux/of_clk.h> > > #include <linux/clockchips.h> > > #include <linux/clocksource.h> > > @@ -18,17 +19,27 @@ EXPORT_SYMBOL_GPL(riscv_timebase); > > void __init time_init(void) > > { > > struct device_node *cpu; > > + struct acpi_table_rhct *rhct; > > + acpi_status status; > > u32 prop; > > > > - cpu = of_find_node_by_path("/cpus"); > > - if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) > > - panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); > > - of_node_put(cpu); > > - riscv_timebase = prop; > > + if (acpi_disabled) { > > + cpu = of_find_node_by_path("/cpus"); > > + if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) > > + panic("RISC-V system with no 'timebase-frequency' in DTS\n"); > > I appreciate that it was like this before, but a newline here (and in > the corresponding spot below) would be nice. Sure!. Will update in next revision. Thanks, Sunil
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c index babaf3b48ba8..2c29543549c3 100644 --- a/arch/riscv/kernel/time.c +++ b/arch/riscv/kernel/time.c @@ -4,6 +4,7 @@ * Copyright (C) 2017 SiFive */ +#include <linux/acpi.h> #include <linux/of_clk.h> #include <linux/clockchips.h> #include <linux/clocksource.h> @@ -18,17 +19,27 @@ EXPORT_SYMBOL_GPL(riscv_timebase); void __init time_init(void) { struct device_node *cpu; + struct acpi_table_rhct *rhct; + acpi_status status; u32 prop; - cpu = of_find_node_by_path("/cpus"); - if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) - panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); - of_node_put(cpu); - riscv_timebase = prop; + if (acpi_disabled) { + cpu = of_find_node_by_path("/cpus"); + if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) + panic("RISC-V system with no 'timebase-frequency' in DTS\n"); + of_node_put(cpu); + riscv_timebase = prop; + of_clk_init(NULL); + } else { + status = acpi_get_table(ACPI_SIG_RHCT, 0, (struct acpi_table_header **)&rhct); + if (ACPI_FAILURE(status)) + panic("RISC-V ACPI system with no RHCT table\n"); + riscv_timebase = rhct->time_base_freq; + acpi_put_table((struct acpi_table_header *)rhct); + } lpj_fine = riscv_timebase / HZ; - of_clk_init(NULL); timer_probe(); tick_setup_hrtimer_broadcast();