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RISC-V: time.c: Add ACPI support for time_init() 

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>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230515054928.2079268-20-sunilvl@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sunil V L 2023-05-15 11:19:26 +05:30 committed by Palmer Dabbelt
parent 21f4f92410
commit 714aa1d1c8
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 19 additions and 6 deletions
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25
arch/riscv/kernel/time.c
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@ -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 +19,29 @@ 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();