1 files changed, 0 insertions, 347 deletions

diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
deleted file mode 100644
index 263eeaddb0aa..000000000000
--- a/arch/x86/kernel/apb_timer.c
+++ /dev/null
@@ -1,347 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * apb_timer.c: Driver for Langwell APB timers
- *
- * (C) Copyright 2009 Intel Corporation
- * Author: Jacob Pan (jacob.jun.pan@intel.com)
- *
- * Note:
- * Langwell is the south complex of Intel Moorestown MID platform. There are
- * eight external timers in total that can be used by the operating system.
- * The timer information, such as frequency and addresses, is provided to the
- * OS via SFI tables.
- * Timer interrupts are routed via FW/HW emulated IOAPIC independently via
- * individual redirection table entries (RTE).
- * Unlike HPET, there is no master counter, therefore one of the timers are
- * used as clocksource. The overall allocation looks like:
- *  - timer 0 - NR_CPUs for per cpu timer
- *  - one timer for clocksource
- *  - one timer for watchdog driver.
- * It is also worth notice that APB timer does not support true one-shot mode,
- * free-running mode will be used here to emulate one-shot mode.
- * APB timer can also be used as broadcast timer along with per cpu local APIC
- * timer, but by default APB timer has higher rating than local APIC timers.
- */
-
-#include <linux/delay.h>
-#include <linux/dw_apb_timer.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/pm.h>
-#include <linux/sfi.h>
-#include <linux/interrupt.h>
-#include <linux/cpu.h>
-#include <linux/irq.h>
-
-#include <asm/fixmap.h>
-#include <asm/apb_timer.h>
-#include <asm/intel-mid.h>
-#include <asm/time.h>
-
-#define APBT_CLOCKEVENT_RATING		110
-#define APBT_CLOCKSOURCE_RATING		250
-
-#define APBT_CLOCKEVENT0_NUM   (0)
-#define APBT_CLOCKSOURCE_NUM   (2)
-
-static phys_addr_t apbt_address;
-static int apb_timer_block_enabled;
-static void __iomem *apbt_virt_address;
-
-/*
- * Common DW APB timer info
- */
-static unsigned long apbt_freq;
-
-struct apbt_dev {
-	struct dw_apb_clock_event_device	*timer;
-	unsigned int				num;
-	int					cpu;
-	unsigned int				irq;
-	char					name[10];
-};
-
-static struct dw_apb_clocksource *clocksource_apbt;
-
-static inline void __iomem *adev_virt_addr(struct apbt_dev *adev)
-{
-	return apbt_virt_address + adev->num * APBTMRS_REG_SIZE;
-}
-
-static DEFINE_PER_CPU(struct apbt_dev, cpu_apbt_dev);
-
-#ifdef CONFIG_SMP
-static unsigned int apbt_num_timers_used;
-#endif
-
-static inline void apbt_set_mapping(void)
-{
-	struct sfi_timer_table_entry *mtmr;
-	int phy_cs_timer_id = 0;
-
-	if (apbt_virt_address) {
-		pr_debug("APBT base already mapped\n");
-		return;
-	}
-	mtmr = sfi_get_mtmr(APBT_CLOCKEVENT0_NUM);
-	if (mtmr == NULL) {
-		printk(KERN_ERR "Failed to get MTMR %d from SFI\n",
-		       APBT_CLOCKEVENT0_NUM);
-		return;
-	}
-	apbt_address = (phys_addr_t)mtmr->phys_addr;
-	if (!apbt_address) {
-		printk(KERN_WARNING "No timer base from SFI, use default\n");
-		apbt_address = APBT_DEFAULT_BASE;
-	}
-	apbt_virt_address = ioremap(apbt_address, APBT_MMAP_SIZE);
-	if (!apbt_virt_address) {
-		pr_debug("Failed mapping APBT phy address at %lu\n",\
-			 (unsigned long)apbt_address);
-		goto panic_noapbt;
-	}
-	apbt_freq = mtmr->freq_hz;
-	sfi_free_mtmr(mtmr);
-
-	/* Now figure out the physical timer id for clocksource device */
-	mtmr = sfi_get_mtmr(APBT_CLOCKSOURCE_NUM);
-	if (mtmr == NULL)
-		goto panic_noapbt;
-
-	/* Now figure out the physical timer id */
-	pr_debug("Use timer %d for clocksource\n",
-		 (int)(mtmr->phys_addr & 0xff) / APBTMRS_REG_SIZE);
-	phy_cs_timer_id = (unsigned int)(mtmr->phys_addr & 0xff) /
-		APBTMRS_REG_SIZE;
-
-	clocksource_apbt = dw_apb_clocksource_init(APBT_CLOCKSOURCE_RATING,
-		"apbt0", apbt_virt_address + phy_cs_timer_id *
-		APBTMRS_REG_SIZE, apbt_freq);
-	return;
-
-panic_noapbt:
-	panic("Failed to setup APB system timer\n");
-
-}
-
-static inline void apbt_clear_mapping(void)
-{
-	iounmap(apbt_virt_address);
-	apbt_virt_address = NULL;
-}
-
-static int __init apbt_clockevent_register(void)
-{
-	struct sfi_timer_table_entry *mtmr;
-	struct apbt_dev *adev = this_cpu_ptr(&cpu_apbt_dev);
-
-	mtmr = sfi_get_mtmr(APBT_CLOCKEVENT0_NUM);
-	if (mtmr == NULL) {
-		printk(KERN_ERR "Failed to get MTMR %d from SFI\n",
-		       APBT_CLOCKEVENT0_NUM);
-		return -ENODEV;
-	}
-
-	adev->num = smp_processor_id();
-	adev->timer = dw_apb_clockevent_init(smp_processor_id(), "apbt0",
-		intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT ?
-		APBT_CLOCKEVENT_RATING - 100 : APBT_CLOCKEVENT_RATING,
-		adev_virt_addr(adev), 0, apbt_freq);
-	/* Firmware does EOI handling for us. */
-	adev->timer->eoi = NULL;
-
-	if (intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT) {
-		global_clock_event = &adev->timer->ced;
-		printk(KERN_DEBUG "%s clockevent registered as global\n",
-		       global_clock_event->name);
-	}
-
-	dw_apb_clockevent_register(adev->timer);
-
-	sfi_free_mtmr(mtmr);
-	return 0;
-}
-
-#ifdef CONFIG_SMP
-
-static void apbt_setup_irq(struct apbt_dev *adev)
-{
-	irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
-	irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
-}
-
-/* Should be called with per cpu */
-void apbt_setup_secondary_clock(void)
-{
-	struct apbt_dev *adev;
-	int cpu;
-
-	/* Don't register boot CPU clockevent */
-	cpu = smp_processor_id();
-	if (!cpu)
-		return;
-
-	adev = this_cpu_ptr(&cpu_apbt_dev);
-	if (!adev->timer) {
-		adev->timer = dw_apb_clockevent_init(cpu, adev->name,
-			APBT_CLOCKEVENT_RATING, adev_virt_addr(adev),
-			adev->irq, apbt_freq);
-		adev->timer->eoi = NULL;
-	} else {
-		dw_apb_clockevent_resume(adev->timer);
-	}
-
-	printk(KERN_INFO "Registering CPU %d clockevent device %s, cpu %08x\n",
-	       cpu, adev->name, adev->cpu);
-
-	apbt_setup_irq(adev);
-	dw_apb_clockevent_register(adev->timer);
-
-	return;
-}
-
-/*
- * this notify handler process CPU hotplug events. in case of S0i3, nonboot
- * cpus are disabled/enabled frequently, for performance reasons, we keep the
- * per cpu timer irq registered so that we do need to do free_irq/request_irq.
- *
- * TODO: it might be more reliable to directly disable percpu clockevent device
- * without the notifier chain. currently, cpu 0 may get interrupts from other
- * cpu timers during the offline process due to the ordering of notification.
- * the extra interrupt is harmless.
- */
-static int apbt_cpu_dead(unsigned int cpu)
-{
-	struct apbt_dev *adev = &per_cpu(cpu_apbt_dev, cpu);
-
-	dw_apb_clockevent_pause(adev->timer);
-	if (system_state == SYSTEM_RUNNING) {
-		pr_debug("skipping APBT CPU %u offline\n", cpu);
-	} else {
-		pr_debug("APBT clockevent for cpu %u offline\n", cpu);
-		dw_apb_clockevent_stop(adev->timer);
-	}
-	return 0;
-}
-
-static __init int apbt_late_init(void)
-{
-	if (intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT ||
-		!apb_timer_block_enabled)
-		return 0;
-	return cpuhp_setup_state(CPUHP_X86_APB_DEAD, "x86/apb:dead", NULL,
-				 apbt_cpu_dead);
-}
-fs_initcall(apbt_late_init);
-#else
-
-void apbt_setup_secondary_clock(void) {}
-
-#endif /* CONFIG_SMP */
-
-static int apbt_clocksource_register(void)
-{
-	u64 start, now;
-	u64 t1;
-
-	/* Start the counter, use timer 2 as source, timer 0/1 for event */
-	dw_apb_clocksource_start(clocksource_apbt);
-
-	/* Verify whether apbt counter works */
-	t1 = dw_apb_clocksource_read(clocksource_apbt);
-	start = rdtsc();
-
-	/*
-	 * We don't know the TSC frequency yet, but waiting for
-	 * 200000 TSC cycles is safe:
-	 * 4 GHz == 50us
-	 * 1 GHz == 200us
-	 */
-	do {
-		rep_nop();
-		now = rdtsc();
-	} while ((now - start) < 200000UL);
-
-	/* APBT is the only always on clocksource, it has to work! */
-	if (t1 == dw_apb_clocksource_read(clocksource_apbt))
-		panic("APBT counter not counting. APBT disabled\n");
-
-	dw_apb_clocksource_register(clocksource_apbt);
-
-	return 0;
-}
-
-/*
- * Early setup the APBT timer, only use timer 0 for booting then switch to
- * per CPU timer if possible.
- * returns 1 if per cpu apbt is setup
- * returns 0 if no per cpu apbt is chosen
- * panic if set up failed, this is the only platform timer on Moorestown.
- */
-void __init apbt_time_init(void)
-{
-#ifdef CONFIG_SMP
-	int i;
-	struct sfi_timer_table_entry *p_mtmr;
-	struct apbt_dev *adev;
-#endif
-
-	if (apb_timer_block_enabled)
-		return;
-	apbt_set_mapping();
-	if (!apbt_virt_address)
-		goto out_noapbt;
-	/*
-	 * Read the frequency and check for a sane value, for ESL model
-	 * we extend the possible clock range to allow time scaling.
-	 */
-
-	if (apbt_freq < APBT_MIN_FREQ || apbt_freq > APBT_MAX_FREQ) {
-		pr_debug("APBT has invalid freq 0x%lx\n", apbt_freq);
-		goto out_noapbt;
-	}
-	if (apbt_clocksource_register()) {
-		pr_debug("APBT has failed to register clocksource\n");
-		goto out_noapbt;
-	}
-	if (!apbt_clockevent_register())
-		apb_timer_block_enabled = 1;
-	else {
-		pr_debug("APBT has failed to register clockevent\n");
-		goto out_noapbt;
-	}
-#ifdef CONFIG_SMP
-	/* kernel cmdline disable apb timer, so we will use lapic timers */
-	if (intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT) {
-		printk(KERN_INFO "apbt: disabled per cpu timer\n");
-		return;
-	}
-	pr_debug("%s: %d CPUs online\n", __func__, num_online_cpus());
-	if (num_possible_cpus() <= sfi_mtimer_num)
-		apbt_num_timers_used = num_possible_cpus();
-	else
-		apbt_num_timers_used = 1;
-	pr_debug("%s: %d APB timers used\n", __func__, apbt_num_timers_used);
-
-	/* here we set up per CPU timer data structure */
-	for (i = 0; i < apbt_num_timers_used; i++) {
-		adev = &per_cpu(cpu_apbt_dev, i);
-		adev->num = i;
-		adev->cpu = i;
-		p_mtmr = sfi_get_mtmr(i);
-		if (p_mtmr)
-			adev->irq = p_mtmr->irq;
-		else
-			printk(KERN_ERR "Failed to get timer for cpu %d\n", i);
-		snprintf(adev->name, sizeof(adev->name) - 1, "apbt%d", i);
-	}
-#endif
-
-	return;
-
-out_noapbt:
-	apbt_clear_mapping();
-	apb_timer_block_enabled = 0;
-	panic("failed to enable APB timer\n");
-}