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authorJames Hogan <jhogan@kernel.org>2018-02-21 15:42:32 +0000
committerJames Hogan <jhogan@kernel.org>2018-02-23 14:30:20 +0000
commitb79a732504ad2d6552458eaf72b4ed807da88340 (patch)
tree67134ae6f26f5c52a8e156eb7f0fe3eb62dd06c1
parentdf46bb1909d92eedccd4216c88e43f75cb0b2901 (diff)
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
-rw-r--r--drivers/clocksource/Kconfig5
-rw-r--r--drivers/clocksource/Makefile1
-rw-r--r--drivers/clocksource/metag_generic.c161
-rw-r--r--include/clocksource/metag_generic.h21
-rw-r--r--include/linux/cpuhotplug.h1
5 files changed, 0 insertions, 189 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index b3b4ed9b6874..f99dbc2f7ee4 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -391,11 +391,6 @@ config ATMEL_ST
help
Support for the Atmel ST timer.
-config CLKSRC_METAG_GENERIC
- def_bool y if METAG
- help
- This option enables support for the Meta per-thread timers.
-
config CLKSRC_EXYNOS_MCT
bool "Exynos multi core timer driver" if COMPILE_TEST
depends on ARM || ARM64
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index d6dec4489d66..a2d47e9ecf91 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -61,7 +61,6 @@ obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o
obj-$(CONFIG_ARMV7M_SYSTICK) += armv7m_systick.o
obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp804.o
-obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
obj-$(CONFIG_ARCH_HAS_TICK_BROADCAST) += dummy_timer.o
obj-$(CONFIG_KEYSTONE_TIMER) += timer-keystone.o
obj-$(CONFIG_INTEGRATOR_AP_TIMER) += timer-integrator-ap.o
diff --git a/drivers/clocksource/metag_generic.c b/drivers/clocksource/metag_generic.c
deleted file mode 100644
index 3e5fa2f62d5f..000000000000
--- a/drivers/clocksource/metag_generic.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/*
- * Copyright (C) 2005-2013 Imagination Technologies Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- *
- * Support for Meta per-thread timers.
- *
- * Meta hardware threads have 2 timers. The background timer (TXTIMER) is used
- * as a free-running time base (hz clocksource), and the interrupt timer
- * (TXTIMERI) is used for the timer interrupt (clock event). Both counters
- * traditionally count at approximately 1MHz.
- */
-
-#include <clocksource/metag_generic.h>
-#include <linux/cpu.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/time.h>
-#include <linux/init.h>
-#include <linux/proc_fs.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/interrupt.h>
-
-#include <asm/clock.h>
-#include <asm/hwthread.h>
-#include <asm/core_reg.h>
-#include <asm/metag_mem.h>
-#include <asm/tbx.h>
-
-#define HARDWARE_FREQ 1000000 /* 1MHz */
-#define HARDWARE_DIV 1 /* divide by 1 = 1MHz clock */
-#define HARDWARE_TO_NS_SHIFT 10 /* convert ticks to ns */
-
-static unsigned int hwtimer_freq = HARDWARE_FREQ;
-static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
-static DEFINE_PER_CPU(char [11], local_clockevent_name);
-
-static int metag_timer_set_next_event(unsigned long delta,
- struct clock_event_device *dev)
-{
- __core_reg_set(TXTIMERI, -delta);
- return 0;
-}
-
-static u64 metag_clocksource_read(struct clocksource *cs)
-{
- return __core_reg_get(TXTIMER);
-}
-
-static struct clocksource clocksource_metag = {
- .name = "META",
- .rating = 200,
- .mask = CLOCKSOURCE_MASK(32),
- .read = metag_clocksource_read,
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static irqreturn_t metag_timer_interrupt(int irq, void *dummy)
-{
- struct clock_event_device *evt = this_cpu_ptr(&local_clockevent);
-
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction metag_timer_irq = {
- .name = "META core timer",
- .handler = metag_timer_interrupt,
- .flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_PERCPU,
-};
-
-unsigned long long sched_clock(void)
-{
- unsigned long long ticks = __core_reg_get(TXTIMER);
- return ticks << HARDWARE_TO_NS_SHIFT;
-}
-
-static int arch_timer_starting_cpu(unsigned int cpu)
-{
- unsigned int txdivtime;
- struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
- char *name = per_cpu(local_clockevent_name, cpu);
-
- txdivtime = __core_reg_get(TXDIVTIME);
-
- txdivtime &= ~TXDIVTIME_DIV_BITS;
- txdivtime |= (HARDWARE_DIV & TXDIVTIME_DIV_BITS);
-
- __core_reg_set(TXDIVTIME, txdivtime);
-
- sprintf(name, "META %d", cpu);
- clk->name = name;
- clk->features = CLOCK_EVT_FEAT_ONESHOT,
-
- clk->rating = 200,
- clk->shift = 12,
- clk->irq = tbisig_map(TBID_SIGNUM_TRT),
- clk->set_next_event = metag_timer_set_next_event,
-
- clk->mult = div_sc(hwtimer_freq, NSEC_PER_SEC, clk->shift);
- clk->max_delta_ns = clockevent_delta2ns(0x7fffffff, clk);
- clk->max_delta_ticks = 0x7fffffff;
- clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
- clk->min_delta_ticks = 0xf;
- clk->cpumask = cpumask_of(cpu);
-
- clockevents_register_device(clk);
-
- /*
- * For all non-boot CPUs we need to synchronize our free
- * running clock (TXTIMER) with the boot CPU's clock.
- *
- * While this won't be accurate, it should be close enough.
- */
- if (cpu) {
- unsigned int thread0 = cpu_2_hwthread_id[0];
- unsigned long val;
-
- val = core_reg_read(TXUCT_ID, TXTIMER_REGNUM, thread0);
- __core_reg_set(TXTIMER, val);
- }
- return 0;
-}
-
-int __init metag_generic_timer_init(void)
-{
- /*
- * On Meta 2 SoCs, the actual frequency of the timer is based on the
- * Meta core clock speed divided by an integer, so it is only
- * approximately 1MHz. Calculating the real frequency here drastically
- * reduces clock skew on these SoCs.
- */
-#ifdef CONFIG_METAG_META21
- hwtimer_freq = get_coreclock() / (metag_in32(EXPAND_TIMER_DIV) + 1);
-#endif
- pr_info("Timer frequency: %u Hz\n", hwtimer_freq);
-
- clocksource_register_hz(&clocksource_metag, hwtimer_freq);
-
- setup_irq(tbisig_map(TBID_SIGNUM_TRT), &metag_timer_irq);
-
- /* Hook cpu boot to configure the CPU's timers */
- return cpuhp_setup_state(CPUHP_AP_METAG_TIMER_STARTING,
- "clockevents/metag:starting",
- arch_timer_starting_cpu, NULL);
-}
diff --git a/include/clocksource/metag_generic.h b/include/clocksource/metag_generic.h
deleted file mode 100644
index ac17e7d06cfb..000000000000
--- a/include/clocksource/metag_generic.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * Copyright (C) 2013 Imaginaton Technologies Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef __CLKSOURCE_METAG_GENERIC_H
-#define __CLKSOURCE_METAG_GENERIC_H
-
-extern int metag_generic_timer_init(void);
-
-#endif /* __CLKSOURCE_METAG_GENERIC_H */
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index c7a950681f3a..5b211fe295f0 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -121,7 +121,6 @@ enum cpuhp_state {
CPUHP_AP_JCORE_TIMER_STARTING,
CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
CPUHP_AP_ARM_TWD_STARTING,
- CPUHP_AP_METAG_TIMER_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,
CPUHP_AP_ARMADA_TIMER_STARTING,
CPUHP_AP_MARCO_TIMER_STARTING,