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authorPalmer Dabbelt <palmer@dabbelt.com>2018-08-04 10:23:19 +0200
committerPalmer Dabbelt <palmer@sifive.com>2018-08-13 08:31:31 -0700
commit62b0194368147def8c5a77ce604a125d620fc582 (patch)
treeffb0a3da4944a8aa15ce481a5e695acc03da3684 /arch/riscv
parent6ea0f26a7913b2a72f9cbe84e77ad2cbeaaa9dde (diff)
download96b-common-62b0194368147def8c5a77ce604a125d620fc582.tar.gz
clocksource: new RISC-V SBI timer driver
The RISC-V ISA defines a per-hart real-time clock and timer, which is present on all systems. The clock is accessed via the 'rdtime' pseudo-instruction (which reads a CSR), and the timer is set via an SBI call. Contains various improvements from Atish Patra <atish.patra@wdc.com>. Signed-off-by: Dmitriy Cherkasov <dmitriy@oss-tech.org> Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com> [hch: remove dead code, add SPDX tags, used riscv_of_processor_hart(), minor cleanups, merged hotplug cpu support and other improvements from Atish] Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv')
-rw-r--r--arch/riscv/include/asm/smp.h3
-rw-r--r--arch/riscv/kernel/irq.c3
-rw-r--r--arch/riscv/kernel/smpboot.c1
-rw-r--r--arch/riscv/kernel/time.c9
4 files changed, 4 insertions, 12 deletions
diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index c9395fff246f..36016845461d 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -25,9 +25,6 @@
#ifdef CONFIG_SMP
/* SMP initialization hook for setup_arch */
-void __init init_clockevent(void);
-
-/* SMP initialization hook for setup_arch */
void __init setup_smp(void);
/* Hook for the generic smp_call_function_many() routine. */
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index ab5f3e22c7cc..0cfac48a1272 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -30,6 +30,9 @@ asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs, unsigned long cause)
irq_enter();
switch (cause & ~INTERRUPT_CAUSE_FLAG) {
+ case INTERRUPT_CAUSE_TIMER:
+ riscv_timer_interrupt();
+ break;
#ifdef CONFIG_SMP
case INTERRUPT_CAUSE_SOFTWARE:
/*
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index f741458c5a3f..56abab6a9812 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -104,7 +104,6 @@ asmlinkage void __init smp_callin(void)
current->active_mm = mm;
trap_init();
- init_clockevent();
notify_cpu_starting(smp_processor_id());
set_cpu_online(smp_processor_id(), 1);
local_flush_tlb_all();
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c
index 0df9b2cbd645..1911c8f6b8a6 100644
--- a/arch/riscv/kernel/time.c
+++ b/arch/riscv/kernel/time.c
@@ -18,12 +18,6 @@
unsigned long riscv_timebase;
-void __init init_clockevent(void)
-{
- timer_probe();
- csr_set(sie, SIE_STIE);
-}
-
void __init time_init(void)
{
struct device_node *cpu;
@@ -35,6 +29,5 @@ void __init time_init(void)
riscv_timebase = prop;
lpj_fine = riscv_timebase / HZ;
-
- init_clockevent();
+ timer_probe();
}