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-rw-r--r--arch/i386/kernel/hpet.c80
-rw-r--r--arch/i386/kernel/i8253.c2
-rw-r--r--arch/i386/kernel/setup.c1
-rw-r--r--arch/i386/kernel/time.c1
-rw-r--r--arch/i386/kernel/tsc.c83
5 files changed, 76 insertions, 91 deletions
diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c
index e1006b7acc9e..f3ab61ee7498 100644
--- a/arch/i386/kernel/hpet.c
+++ b/arch/i386/kernel/hpet.c
@@ -201,12 +201,30 @@ static int hpet_next_event(unsigned long delta,
}
/*
+ * Clock source related code
+ */
+static cycle_t read_hpet(void)
+{
+ return (cycle_t)hpet_readl(HPET_COUNTER);
+}
+
+static struct clocksource clocksource_hpet = {
+ .name = "hpet",
+ .rating = 250,
+ .read = read_hpet,
+ .mask = HPET_MASK,
+ .shift = HPET_SHIFT,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+/*
* Try to setup the HPET timer
*/
int __init hpet_enable(void)
{
unsigned long id;
uint64_t hpet_freq;
+ u64 tmp;
if (!is_hpet_capable())
return 0;
@@ -253,6 +271,25 @@ int __init hpet_enable(void)
/* Start the counter */
hpet_start_counter();
+ /* Initialize and register HPET clocksource
+ *
+ * hpet period is in femto seconds per cycle
+ * so we need to convert this to ns/cyc units
+ * aproximated by mult/2^shift
+ *
+ * fsec/cyc * 1nsec/1000000fsec = nsec/cyc = mult/2^shift
+ * fsec/cyc * 1ns/1000000fsec * 2^shift = mult
+ * fsec/cyc * 2^shift * 1nsec/1000000fsec = mult
+ * (fsec/cyc << shift)/1000000 = mult
+ * (hpet_period << shift)/FSEC_PER_NSEC = mult
+ */
+ tmp = (u64)hpet_period << HPET_SHIFT;
+ do_div(tmp, FSEC_PER_NSEC);
+ clocksource_hpet.mult = (u32)tmp;
+
+ clocksource_register(&clocksource_hpet);
+
+
if (id & HPET_ID_LEGSUP) {
hpet_enable_int();
hpet_reserve_platform_timers(id);
@@ -273,49 +310,6 @@ out_nohpet:
return 0;
}
-/*
- * Clock source related code
- */
-static cycle_t read_hpet(void)
-{
- return (cycle_t)hpet_readl(HPET_COUNTER);
-}
-
-static struct clocksource clocksource_hpet = {
- .name = "hpet",
- .rating = 250,
- .read = read_hpet,
- .mask = HPET_MASK,
- .shift = HPET_SHIFT,
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static int __init init_hpet_clocksource(void)
-{
- u64 tmp;
-
- if (!hpet_virt_address)
- return -ENODEV;
-
- /*
- * hpet period is in femto seconds per cycle
- * so we need to convert this to ns/cyc units
- * aproximated by mult/2^shift
- *
- * fsec/cyc * 1nsec/1000000fsec = nsec/cyc = mult/2^shift
- * fsec/cyc * 1ns/1000000fsec * 2^shift = mult
- * fsec/cyc * 2^shift * 1nsec/1000000fsec = mult
- * (fsec/cyc << shift)/1000000 = mult
- * (hpet_period << shift)/FSEC_PER_NSEC = mult
- */
- tmp = (u64)hpet_period << HPET_SHIFT;
- do_div(tmp, FSEC_PER_NSEC);
- clocksource_hpet.mult = (u32)tmp;
-
- return clocksource_register(&clocksource_hpet);
-}
-
-module_init(init_hpet_clocksource);
#ifdef CONFIG_HPET_EMULATE_RTC
diff --git a/arch/i386/kernel/i8253.c b/arch/i386/kernel/i8253.c
index a6bc7bb38834..5cbb776b3089 100644
--- a/arch/i386/kernel/i8253.c
+++ b/arch/i386/kernel/i8253.c
@@ -195,4 +195,4 @@ static int __init init_pit_clocksource(void)
clocksource_pit.mult = clocksource_hz2mult(CLOCK_TICK_RATE, 20);
return clocksource_register(&clocksource_pit);
}
-module_init(init_pit_clocksource);
+arch_initcall(init_pit_clocksource);
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 122623dcc6e1..698c24fe482e 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -657,5 +657,4 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &dummy_con;
#endif
#endif
- tsc_init();
}
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index ccd3734edb8f..94e5cb091104 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -279,5 +279,6 @@ void __init hpet_time_init(void)
*/
void __init time_init(void)
{
+ tsc_init();
late_time_init = choose_time_init();
}
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index 59222a04234b..875d8a6ecc02 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -184,34 +184,6 @@ int recalibrate_cpu_khz(void)
EXPORT_SYMBOL(recalibrate_cpu_khz);
-void __init tsc_init(void)
-{
- if (!cpu_has_tsc || tsc_disable)
- goto out_no_tsc;
-
- cpu_khz = calculate_cpu_khz();
- tsc_khz = cpu_khz;
-
- if (!cpu_khz)
- goto out_no_tsc;
-
- printk("Detected %lu.%03lu MHz processor.\n",
- (unsigned long)cpu_khz / 1000,
- (unsigned long)cpu_khz % 1000);
-
- set_cyc2ns_scale(cpu_khz);
- use_tsc_delay();
- return;
-
-out_no_tsc:
- /*
- * Set the tsc_disable flag if there's no TSC support, this
- * makes it a fast flag for the kernel to see whether it
- * should be using the TSC.
- */
- tsc_disable = 1;
-}
-
#ifdef CONFIG_CPU_FREQ
/*
@@ -381,28 +353,47 @@ static void __init check_geode_tsc_reliable(void)
static inline void check_geode_tsc_reliable(void) { }
#endif
-static int __init init_tsc_clocksource(void)
+
+void __init tsc_init(void)
{
+ if (!cpu_has_tsc || tsc_disable)
+ goto out_no_tsc;
- if (cpu_has_tsc && tsc_khz && !tsc_disable) {
- /* check blacklist */
- dmi_check_system(bad_tsc_dmi_table);
+ cpu_khz = calculate_cpu_khz();
+ tsc_khz = cpu_khz;
- unsynchronized_tsc();
- check_geode_tsc_reliable();
- current_tsc_khz = tsc_khz;
- clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
- clocksource_tsc.shift);
- /* lower the rating if we already know its unstable: */
- if (check_tsc_unstable()) {
- clocksource_tsc.rating = 0;
- clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
- }
+ if (!cpu_khz)
+ goto out_no_tsc;
- return clocksource_register(&clocksource_tsc);
+ printk("Detected %lu.%03lu MHz processor.\n",
+ (unsigned long)cpu_khz / 1000,
+ (unsigned long)cpu_khz % 1000);
+
+ set_cyc2ns_scale(cpu_khz);
+ use_tsc_delay();
+
+ /* Check and install the TSC clocksource */
+ dmi_check_system(bad_tsc_dmi_table);
+
+ unsynchronized_tsc();
+ check_geode_tsc_reliable();
+ current_tsc_khz = tsc_khz;
+ clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
+ clocksource_tsc.shift);
+ /* lower the rating if we already know its unstable: */
+ if (check_tsc_unstable()) {
+ clocksource_tsc.rating = 0;
+ clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
}
+ clocksource_register(&clocksource_tsc);
- return 0;
-}
+ return;
-module_init(init_tsc_clocksource);
+out_no_tsc:
+ /*
+ * Set the tsc_disable flag if there's no TSC support, this
+ * makes it a fast flag for the kernel to see whether it
+ * should be using the TSC.
+ */
+ tsc_disable = 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 09:22:07 +0100