forked from Minki/linux
clocksource: Remove metag generic timer driver
Now that arch/metag/ has been removed, remove the metag generic per-thread timer driver. It is of no value without the architecture code. Signed-off-by: James Hogan <jhogan@kernel.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-metag@vger.kernel.org
This commit is contained in:
James Hogan
parent
df46bb1909
commit
b79a732504
@ -391,11 +391,6 @@ config ATMEL_ST
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help
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Support for the Atmel ST timer.
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config CLKSRC_METAG_GENERIC
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def_bool y if METAG
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help
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This option enables support for the Meta per-thread timers.
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config CLKSRC_EXYNOS_MCT
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bool "Exynos multi core timer driver" if COMPILE_TEST
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depends on ARM || ARM64
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@ -61,7 +61,6 @@ obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
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obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o
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obj-$(CONFIG_ARMV7M_SYSTICK) += armv7m_systick.o
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obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp804.o
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obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
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obj-$(CONFIG_ARCH_HAS_TICK_BROADCAST) += dummy_timer.o
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obj-$(CONFIG_KEYSTONE_TIMER) += timer-keystone.o
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obj-$(CONFIG_INTEGRATOR_AP_TIMER) += timer-integrator-ap.o
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@ -1,161 +0,0 @@
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/*
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* Copyright (C) 2005-2013 Imagination Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* Support for Meta per-thread timers.
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*
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* Meta hardware threads have 2 timers. The background timer (TXTIMER) is used
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* as a free-running time base (hz clocksource), and the interrupt timer
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* (TXTIMERI) is used for the timer interrupt (clock event). Both counters
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* traditionally count at approximately 1MHz.
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*/
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#include <clocksource/metag_generic.h>
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/clocksource.h>
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#include <linux/clockchips.h>
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#include <linux/interrupt.h>
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#include <asm/clock.h>
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#include <asm/hwthread.h>
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#include <asm/core_reg.h>
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#include <asm/metag_mem.h>
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#include <asm/tbx.h>
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#define HARDWARE_FREQ 1000000 /* 1MHz */
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#define HARDWARE_DIV 1 /* divide by 1 = 1MHz clock */
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#define HARDWARE_TO_NS_SHIFT 10 /* convert ticks to ns */
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static unsigned int hwtimer_freq = HARDWARE_FREQ;
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static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
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static DEFINE_PER_CPU(char [11], local_clockevent_name);
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static int metag_timer_set_next_event(unsigned long delta,
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struct clock_event_device *dev)
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{
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__core_reg_set(TXTIMERI, -delta);
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return 0;
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}
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static u64 metag_clocksource_read(struct clocksource *cs)
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{
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return __core_reg_get(TXTIMER);
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}
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static struct clocksource clocksource_metag = {
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.name = "META",
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.rating = 200,
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.mask = CLOCKSOURCE_MASK(32),
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.read = metag_clocksource_read,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static irqreturn_t metag_timer_interrupt(int irq, void *dummy)
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{
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struct clock_event_device *evt = this_cpu_ptr(&local_clockevent);
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evt->event_handler(evt);
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return IRQ_HANDLED;
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}
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static struct irqaction metag_timer_irq = {
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.name = "META core timer",
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.handler = metag_timer_interrupt,
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.flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_PERCPU,
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};
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unsigned long long sched_clock(void)
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{
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unsigned long long ticks = __core_reg_get(TXTIMER);
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return ticks << HARDWARE_TO_NS_SHIFT;
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}
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static int arch_timer_starting_cpu(unsigned int cpu)
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{
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unsigned int txdivtime;
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struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
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char *name = per_cpu(local_clockevent_name, cpu);
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txdivtime = __core_reg_get(TXDIVTIME);
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txdivtime &= ~TXDIVTIME_DIV_BITS;
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txdivtime |= (HARDWARE_DIV & TXDIVTIME_DIV_BITS);
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__core_reg_set(TXDIVTIME, txdivtime);
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sprintf(name, "META %d", cpu);
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clk->name = name;
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clk->features = CLOCK_EVT_FEAT_ONESHOT,
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clk->rating = 200,
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clk->shift = 12,
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clk->irq = tbisig_map(TBID_SIGNUM_TRT),
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clk->set_next_event = metag_timer_set_next_event,
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clk->mult = div_sc(hwtimer_freq, NSEC_PER_SEC, clk->shift);
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clk->max_delta_ns = clockevent_delta2ns(0x7fffffff, clk);
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clk->max_delta_ticks = 0x7fffffff;
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clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
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clk->min_delta_ticks = 0xf;
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clk->cpumask = cpumask_of(cpu);
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clockevents_register_device(clk);
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/*
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* For all non-boot CPUs we need to synchronize our free
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* running clock (TXTIMER) with the boot CPU's clock.
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*
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* While this won't be accurate, it should be close enough.
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*/
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if (cpu) {
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unsigned int thread0 = cpu_2_hwthread_id[0];
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unsigned long val;
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val = core_reg_read(TXUCT_ID, TXTIMER_REGNUM, thread0);
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__core_reg_set(TXTIMER, val);
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}
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return 0;
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}
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int __init metag_generic_timer_init(void)
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{
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/*
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* On Meta 2 SoCs, the actual frequency of the timer is based on the
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* Meta core clock speed divided by an integer, so it is only
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* approximately 1MHz. Calculating the real frequency here drastically
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* reduces clock skew on these SoCs.
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*/
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#ifdef CONFIG_METAG_META21
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hwtimer_freq = get_coreclock() / (metag_in32(EXPAND_TIMER_DIV) + 1);
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#endif
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pr_info("Timer frequency: %u Hz\n", hwtimer_freq);
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clocksource_register_hz(&clocksource_metag, hwtimer_freq);
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setup_irq(tbisig_map(TBID_SIGNUM_TRT), &metag_timer_irq);
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/* Hook cpu boot to configure the CPU's timers */
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return cpuhp_setup_state(CPUHP_AP_METAG_TIMER_STARTING,
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"clockevents/metag:starting",
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arch_timer_starting_cpu, NULL);
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}
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@ -1,21 +0,0 @@
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/*
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* Copyright (C) 2013 Imaginaton Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __CLKSOURCE_METAG_GENERIC_H
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#define __CLKSOURCE_METAG_GENERIC_H
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extern int metag_generic_timer_init(void);
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#endif /* __CLKSOURCE_METAG_GENERIC_H */
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@ -121,7 +121,6 @@ enum cpuhp_state {
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CPUHP_AP_JCORE_TIMER_STARTING,
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CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
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CPUHP_AP_ARM_TWD_STARTING,
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CPUHP_AP_METAG_TIMER_STARTING,
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CPUHP_AP_QCOM_TIMER_STARTING,
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CPUHP_AP_ARMADA_TIMER_STARTING,
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CPUHP_AP_MARCO_TIMER_STARTING,
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