Revert "drivers: timer: tsc: retrieve clock frequency of system timer at runtime"

This reverts commit d82f4a9.

#69705
Introduced a regression in main in which
tests/subsys/logging/log_timestamp
started failing. (See
#72344
for more info).
Let's revert the PR. It can be submitted after with the issue
fixed.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

drivers/timer/apic_tsc.c

@@ -8,18 +8,12 @@
 #include <zephyr/spinlock.h>
 #include <zephyr/drivers/interrupt_controller/loapic.h>
 #include <zephyr/irq.h>
-#include <cpuid.h>
 
 #define IA32_TSC_DEADLINE_MSR 0x6e0
 #define IA32_TSC_ADJUST_MSR   0x03b
 
-#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
-static uint64_t CYC_PER_TICK;
-extern int z_clock_hw_cycles_per_sec;
-#else
 #define CYC_PER_TICK (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC \
 		      / (uint64_t) CONFIG_SYS_CLOCK_TICKS_PER_SEC)
-#endif
 
 struct apic_timer_lvt {
 	uint8_t vector   : 8;
@@ -164,11 +158,9 @@ static inline void cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *
 
 static int sys_clock_driver_init(void)
 {
-#if defined(CONFIG_ASSERT) || defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
+#ifdef CONFIG_ASSERT
 	uint32_t eax, ebx, ecx, edx;
-#endif
 
-#ifdef CONFIG_ASSERT
 	eax = 1; ecx = 0;
 	cpuid(&eax, &ebx, &ecx, &edx);
 	__ASSERT((ecx & BIT(24)) != 0, "No TSC Deadline support");
@@ -182,23 +174,6 @@ static int sys_clock_driver_init(void)
 	__ASSERT((ebx & BIT(1)) != 0, "No TSC_ADJUST MSR support");
 #endif
 
-#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
-	int tsc_freq;
-
-	eax = 0;
-	ebx = 0;
-	ecx = 0;
-	if (!__get_cpuid(0x15, &eax, &ebx, &ecx, &edx)) {
-		__ASSERT(false, "error cpuid leaf 0x15\n");
-	}
-
-	__ASSERT((ebx != 0) && (ecx != 0), "No TSC/core crystal clock ratio is enumerated");
-
-	tsc_freq = (uint32_t)((ecx * (uint64_t)ebx) / eax);
-	z_clock_hw_cycles_per_sec = tsc_freq;
-	CYC_PER_TICK = tsc_freq/CONFIG_SYS_CLOCK_TICKS_PER_SEC;
-#endif
-
 	clear_tsc_adjust();
 
 	/* Timer interrupt number is runtime-fetched, so can't use