Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 898 insertions, 0 deletions

diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c
new file mode 100644
index 000000000..f0eba72aa
--- /dev/null
+++ b/arch/sparc/kernel/time_64.c
@@ -0,0 +1,898 @@
+// SPDX-License-Identifier: GPL-2.0
+/* time.c: UltraSparc timer and TOD clock support.
+ *
+ * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1998 Eddie C. Dost   (ecd@skynet.be)
+ *
+ * Based largely on code which is:
+ *
+ * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
+ */
+
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/mc146818rtc.h>
+#include <linux/delay.h>
+#include <linux/profile.h>
+#include <linux/bcd.h>
+#include <linux/jiffies.h>
+#include <linux/cpufreq.h>
+#include <linux/percpu.h>
+#include <linux/rtc/m48t59.h>
+#include <linux/kernel_stat.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/platform_device.h>
+#include <linux/ftrace.h>
+
+#include <asm/oplib.h>
+#include <asm/timer.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/starfire.h>
+#include <asm/smp.h>
+#include <asm/sections.h>
+#include <asm/cpudata.h>
+#include <linux/uaccess.h>
+#include <asm/irq_regs.h>
+#include <asm/cacheflush.h>
+
+#include "entry.h"
+#include "kernel.h"
+
+DEFINE_SPINLOCK(rtc_lock);
+
+unsigned int __read_mostly vdso_fix_stick;
+
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
+{
+	unsigned long pc = instruction_pointer(regs);
+
+	if (in_lock_functions(pc))
+		return regs->u_regs[UREG_RETPC];
+	return pc;
+}
+EXPORT_SYMBOL(profile_pc);
+#endif
+
+static void tick_disable_protection(void)
+{
+	/* Set things up so user can access tick register for profiling
+	 * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
+	 * read back of %tick after writing it.
+	 */
+	__asm__ __volatile__(
+	"	ba,pt	%%xcc, 1f\n"
+	"	 nop\n"
+	"	.align	64\n"
+	"1:	rd	%%tick, %%g2\n"
+	"	add	%%g2, 6, %%g2\n"
+	"	andn	%%g2, %0, %%g2\n"
+	"	wrpr	%%g2, 0, %%tick\n"
+	"	rdpr	%%tick, %%g0"
+	: /* no outputs */
+	: "r" (TICK_PRIV_BIT)
+	: "g2");
+}
+
+static void tick_disable_irq(void)
+{
+	__asm__ __volatile__(
+	"	ba,pt	%%xcc, 1f\n"
+	"	 nop\n"
+	"	.align	64\n"
+	"1:	wr	%0, 0x0, %%tick_cmpr\n"
+	"	rd	%%tick_cmpr, %%g0"
+	: /* no outputs */
+	: "r" (TICKCMP_IRQ_BIT));
+}
+
+static void tick_init_tick(void)
+{
+	tick_disable_protection();
+	tick_disable_irq();
+}
+
+static unsigned long long tick_get_tick(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%tick, %0\n\t"
+			     "mov	%0, %0"
+			     : "=r" (ret));
+
+	return ret & ~TICK_PRIV_BIT;
+}
+
+static int tick_add_compare(unsigned long adj)
+{
+	unsigned long orig_tick, new_tick, new_compare;
+
+	__asm__ __volatile__("rd	%%tick, %0"
+			     : "=r" (orig_tick));
+
+	orig_tick &= ~TICKCMP_IRQ_BIT;
+
+	/* Workaround for Spitfire Errata (#54 I think??), I discovered
+	 * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
+	 * number 103640.
+	 *
+	 * On Blackbird writes to %tick_cmpr can fail, the
+	 * workaround seems to be to execute the wr instruction
+	 * at the start of an I-cache line, and perform a dummy
+	 * read back from %tick_cmpr right after writing to it. -DaveM
+	 */
+	__asm__ __volatile__("ba,pt	%%xcc, 1f\n\t"
+			     " add	%1, %2, %0\n\t"
+			     ".align	64\n"
+			     "1:\n\t"
+			     "wr	%0, 0, %%tick_cmpr\n\t"
+			     "rd	%%tick_cmpr, %%g0\n\t"
+			     : "=r" (new_compare)
+			     : "r" (orig_tick), "r" (adj));
+
+	__asm__ __volatile__("rd	%%tick, %0"
+			     : "=r" (new_tick));
+	new_tick &= ~TICKCMP_IRQ_BIT;
+
+	return ((long)(new_tick - (orig_tick+adj))) > 0L;
+}
+
+static unsigned long tick_add_tick(unsigned long adj)
+{
+	unsigned long new_tick;
+
+	/* Also need to handle Blackbird bug here too. */
+	__asm__ __volatile__("rd	%%tick, %0\n\t"
+			     "add	%0, %1, %0\n\t"
+			     "wrpr	%0, 0, %%tick\n\t"
+			     : "=&r" (new_tick)
+			     : "r" (adj));
+
+	return new_tick;
+}
+
+/* Searches for cpu clock frequency with given cpuid in OpenBoot tree */
+static unsigned long cpuid_to_freq(phandle node, int cpuid)
+{
+	bool is_cpu_node = false;
+	unsigned long freq = 0;
+	char type[128];
+
+	if (!node)
+		return freq;
+
+	if (prom_getproperty(node, "device_type", type, sizeof(type)) != -1)
+		is_cpu_node = (strcmp(type, "cpu") == 0);
+
+	/* try upa-portid then cpuid to get cpuid, see prom_64.c */
+	if (is_cpu_node && (prom_getint(node, "upa-portid") == cpuid ||
+			    prom_getint(node, "cpuid") == cpuid))
+		freq = prom_getintdefault(node, "clock-frequency", 0);
+	if (!freq)
+		freq = cpuid_to_freq(prom_getchild(node), cpuid);
+	if (!freq)
+		freq = cpuid_to_freq(prom_getsibling(node), cpuid);
+
+	return freq;
+}
+
+static unsigned long tick_get_frequency(void)
+{
+	return cpuid_to_freq(prom_root_node, hard_smp_processor_id());
+}
+
+static struct sparc64_tick_ops tick_operations __cacheline_aligned = {
+	.name		=	"tick",
+	.init_tick	=	tick_init_tick,
+	.disable_irq	=	tick_disable_irq,
+	.get_tick	=	tick_get_tick,
+	.add_tick	=	tick_add_tick,
+	.add_compare	=	tick_add_compare,
+	.get_frequency	=	tick_get_frequency,
+	.softint_mask	=	1UL << 0,
+};
+
+struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
+EXPORT_SYMBOL(tick_ops);
+
+static void stick_disable_irq(void)
+{
+	__asm__ __volatile__(
+	"wr	%0, 0x0, %%asr25"
+	: /* no outputs */
+	: "r" (TICKCMP_IRQ_BIT));
+}
+
+static void stick_init_tick(void)
+{
+	/* Writes to the %tick and %stick register are not
+	 * allowed on sun4v.  The Hypervisor controls that
+	 * bit, per-strand.
+	 */
+	if (tlb_type != hypervisor) {
+		tick_disable_protection();
+		tick_disable_irq();
+
+		/* Let the user get at STICK too. */
+		__asm__ __volatile__(
+		"	rd	%%asr24, %%g2\n"
+		"	andn	%%g2, %0, %%g2\n"
+		"	wr	%%g2, 0, %%asr24"
+		: /* no outputs */
+		: "r" (TICK_PRIV_BIT)
+		: "g1", "g2");
+	}
+
+	stick_disable_irq();
+}
+
+static unsigned long long stick_get_tick(void)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("rd	%%asr24, %0"
+			     : "=r" (ret));
+
+	return ret & ~TICK_PRIV_BIT;
+}
+
+static unsigned long stick_add_tick(unsigned long adj)
+{
+	unsigned long new_tick;
+
+	__asm__ __volatile__("rd	%%asr24, %0\n\t"
+			     "add	%0, %1, %0\n\t"
+			     "wr	%0, 0, %%asr24\n\t"
+			     : "=&r" (new_tick)
+			     : "r" (adj));
+
+	return new_tick;
+}
+
+static int stick_add_compare(unsigned long adj)
+{
+	unsigned long orig_tick, new_tick;
+
+	__asm__ __volatile__("rd	%%asr24, %0"
+			     : "=r" (orig_tick));
+	orig_tick &= ~TICKCMP_IRQ_BIT;
+
+	__asm__ __volatile__("wr	%0, 0, %%asr25"
+			     : /* no outputs */
+			     : "r" (orig_tick + adj));
+
+	__asm__ __volatile__("rd	%%asr24, %0"
+			     : "=r" (new_tick));
+	new_tick &= ~TICKCMP_IRQ_BIT;
+
+	return ((long)(new_tick - (orig_tick+adj))) > 0L;
+}
+
+static unsigned long stick_get_frequency(void)
+{
+	return prom_getintdefault(prom_root_node, "stick-frequency", 0);
+}
+
+static struct sparc64_tick_ops stick_operations __read_mostly = {
+	.name		=	"stick",
+	.init_tick	=	stick_init_tick,
+	.disable_irq	=	stick_disable_irq,
+	.get_tick	=	stick_get_tick,
+	.add_tick	=	stick_add_tick,
+	.add_compare	=	stick_add_compare,
+	.get_frequency	=	stick_get_frequency,
+	.softint_mask	=	1UL << 16,
+};
+
+/* On Hummingbird the STICK/STICK_CMPR register is implemented
+ * in I/O space.  There are two 64-bit registers each, the
+ * first holds the low 32-bits of the value and the second holds
+ * the high 32-bits.
+ *
+ * Since STICK is constantly updating, we have to access it carefully.
+ *
+ * The sequence we use to read is:
+ * 1) read high
+ * 2) read low
+ * 3) read high again, if it rolled re-read both low and high again.
+ *
+ * Writing STICK safely is also tricky:
+ * 1) write low to zero
+ * 2) write high
+ * 3) write low
+ */
+static unsigned long __hbird_read_stick(void)
+{
+	unsigned long ret, tmp1, tmp2, tmp3;
+	unsigned long addr = HBIRD_STICK_ADDR+8;
+
+	__asm__ __volatile__("ldxa	[%1] %5, %2\n"
+			     "1:\n\t"
+			     "sub	%1, 0x8, %1\n\t"
+			     "ldxa	[%1] %5, %3\n\t"
+			     "add	%1, 0x8, %1\n\t"
+			     "ldxa	[%1] %5, %4\n\t"
+			     "cmp	%4, %2\n\t"
+			     "bne,a,pn	%%xcc, 1b\n\t"
+			     " mov	%4, %2\n\t"
+			     "sllx	%4, 32, %4\n\t"
+			     "or	%3, %4, %0\n\t"
+			     : "=&r" (ret), "=&r" (addr),
+			       "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
+			     : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
+
+	return ret;
+}
+
+static void __hbird_write_stick(unsigned long val)
+{
+	unsigned long low = (val & 0xffffffffUL);
+	unsigned long high = (val >> 32UL);
+	unsigned long addr = HBIRD_STICK_ADDR;
+
+	__asm__ __volatile__("stxa	%%g0, [%0] %4\n\t"
+			     "add	%0, 0x8, %0\n\t"
+			     "stxa	%3, [%0] %4\n\t"
+			     "sub	%0, 0x8, %0\n\t"
+			     "stxa	%2, [%0] %4"
+			     : "=&r" (addr)
+			     : "0" (addr), "r" (low), "r" (high),
+			       "i" (ASI_PHYS_BYPASS_EC_E));
+}
+
+static void __hbird_write_compare(unsigned long val)
+{
+	unsigned long low = (val & 0xffffffffUL);
+	unsigned long high = (val >> 32UL);
+	unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
+
+	__asm__ __volatile__("stxa	%3, [%0] %4\n\t"
+			     "sub	%0, 0x8, %0\n\t"
+			     "stxa	%2, [%0] %4"
+			     : "=&r" (addr)
+			     : "0" (addr), "r" (low), "r" (high),
+			       "i" (ASI_PHYS_BYPASS_EC_E));
+}
+
+static void hbtick_disable_irq(void)
+{
+	__hbird_write_compare(TICKCMP_IRQ_BIT);
+}
+
+static void hbtick_init_tick(void)
+{
+	tick_disable_protection();
+
+	/* XXX This seems to be necessary to 'jumpstart' Hummingbird
+	 * XXX into actually sending STICK interrupts.  I think because
+	 * XXX of how we store %tick_cmpr in head.S this somehow resets the
+	 * XXX {TICK + STICK} interrupt mux.  -DaveM
+	 */
+	__hbird_write_stick(__hbird_read_stick());
+
+	hbtick_disable_irq();
+}
+
+static unsigned long long hbtick_get_tick(void)
+{
+	return __hbird_read_stick() & ~TICK_PRIV_BIT;
+}
+
+static unsigned long hbtick_add_tick(unsigned long adj)
+{
+	unsigned long val;
+
+	val = __hbird_read_stick() + adj;
+	__hbird_write_stick(val);
+
+	return val;
+}
+
+static int hbtick_add_compare(unsigned long adj)
+{
+	unsigned long val = __hbird_read_stick();
+	unsigned long val2;
+
+	val &= ~TICKCMP_IRQ_BIT;
+	val += adj;
+	__hbird_write_compare(val);
+
+	val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
+
+	return ((long)(val2 - val)) > 0L;
+}
+
+static unsigned long hbtick_get_frequency(void)
+{
+	return prom_getintdefault(prom_root_node, "stick-frequency", 0);
+}
+
+static struct sparc64_tick_ops hbtick_operations __read_mostly = {
+	.name		=	"hbtick",
+	.init_tick	=	hbtick_init_tick,
+	.disable_irq	=	hbtick_disable_irq,
+	.get_tick	=	hbtick_get_tick,
+	.add_tick	=	hbtick_add_tick,
+	.add_compare	=	hbtick_add_compare,
+	.get_frequency	=	hbtick_get_frequency,
+	.softint_mask	=	1UL << 0,
+};
+
+unsigned long cmos_regs;
+EXPORT_SYMBOL(cmos_regs);
+
+static struct resource rtc_cmos_resource;
+
+static struct platform_device rtc_cmos_device = {
+	.name		= "rtc_cmos",
+	.id		= -1,
+	.resource	= &rtc_cmos_resource,
+	.num_resources	= 1,
+};
+
+static int rtc_probe(struct platform_device *op)
+{
+	struct resource *r;
+
+	printk(KERN_INFO "%s: RTC regs at 0x%llx\n",
+	       op->dev.of_node->full_name, op->resource[0].start);
+
+	/* The CMOS RTC driver only accepts IORESOURCE_IO, so cons
+	 * up a fake resource so that the probe works for all cases.
+	 * When the RTC is behind an ISA bus it will have IORESOURCE_IO
+	 * already, whereas when it's behind EBUS is will be IORESOURCE_MEM.
+	 */
+
+	r = &rtc_cmos_resource;
+	r->flags = IORESOURCE_IO;
+	r->name = op->resource[0].name;
+	r->start = op->resource[0].start;
+	r->end = op->resource[0].end;
+
+	cmos_regs = op->resource[0].start;
+	return platform_device_register(&rtc_cmos_device);
+}
+
+static const struct of_device_id rtc_match[] = {
+	{
+		.name = "rtc",
+		.compatible = "m5819",
+	},
+	{
+		.name = "rtc",
+		.compatible = "isa-m5819p",
+	},
+	{
+		.name = "rtc",
+		.compatible = "isa-m5823p",
+	},
+	{
+		.name = "rtc",
+		.compatible = "ds1287",
+	},
+	{},
+};
+
+static struct platform_driver rtc_driver = {
+	.probe		= rtc_probe,
+	.driver = {
+		.name = "rtc",
+		.of_match_table = rtc_match,
+	},
+};
+
+static struct platform_device rtc_bq4802_device = {
+	.name		= "rtc-bq4802",
+	.id		= -1,
+	.num_resources	= 1,
+};
+
+static int bq4802_probe(struct platform_device *op)
+{
+
+	printk(KERN_INFO "%s: BQ4802 regs at 0x%llx\n",
+	       op->dev.of_node->full_name, op->resource[0].start);
+
+	rtc_bq4802_device.resource = &op->resource[0];
+	return platform_device_register(&rtc_bq4802_device);
+}
+
+static const struct of_device_id bq4802_match[] = {
+	{
+		.name = "rtc",
+		.compatible = "bq4802",
+	},
+	{},
+};
+
+static struct platform_driver bq4802_driver = {
+	.probe		= bq4802_probe,
+	.driver = {
+		.name = "bq4802",
+		.of_match_table = bq4802_match,
+	},
+};
+
+static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	void __iomem *regs = (void __iomem *) pdev->resource[0].start;
+
+	return readb(regs + ofs);
+}
+
+static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	void __iomem *regs = (void __iomem *) pdev->resource[0].start;
+
+	writeb(val, regs + ofs);
+}
+
+static struct m48t59_plat_data m48t59_data = {
+	.read_byte	= mostek_read_byte,
+	.write_byte	= mostek_write_byte,
+};
+
+static struct platform_device m48t59_rtc = {
+	.name		= "rtc-m48t59",
+	.id		= 0,
+	.num_resources	= 1,
+	.dev	= {
+		.platform_data = &m48t59_data,
+	},
+};
+
+static int mostek_probe(struct platform_device *op)
+{
+	struct device_node *dp = op->dev.of_node;
+
+	/* On an Enterprise system there can be multiple mostek clocks.
+	 * We should only match the one that is on the central FHC bus.
+	 */
+	if (!strcmp(dp->parent->name, "fhc") &&
+	    strcmp(dp->parent->parent->name, "central") != 0)
+		return -ENODEV;
+
+	printk(KERN_INFO "%s: Mostek regs at 0x%llx\n",
+	       dp->full_name, op->resource[0].start);
+
+	m48t59_rtc.resource = &op->resource[0];
+	return platform_device_register(&m48t59_rtc);
+}
+
+static const struct of_device_id mostek_match[] = {
+	{
+		.name = "eeprom",
+	},
+	{},
+};
+
+static struct platform_driver mostek_driver = {
+	.probe		= mostek_probe,
+	.driver = {
+		.name = "mostek",
+		.of_match_table = mostek_match,
+	},
+};
+
+static struct platform_device rtc_sun4v_device = {
+	.name		= "rtc-sun4v",
+	.id		= -1,
+};
+
+static struct platform_device rtc_starfire_device = {
+	.name		= "rtc-starfire",
+	.id		= -1,
+};
+
+static int __init clock_init(void)
+{
+	if (this_is_starfire)
+		return platform_device_register(&rtc_starfire_device);
+
+	if (tlb_type == hypervisor)
+		return platform_device_register(&rtc_sun4v_device);
+
+	(void) platform_driver_register(&rtc_driver);
+	(void) platform_driver_register(&mostek_driver);
+	(void) platform_driver_register(&bq4802_driver);
+
+	return 0;
+}
+
+/* Must be after subsys_initcall() so that busses are probed.  Must
+ * be before device_initcall() because things like the RTC driver
+ * need to see the clock registers.
+ */
+fs_initcall(clock_init);
+
+/* Return true if this is Hummingbird, aka Ultra-IIe */
+static bool is_hummingbird(void)
+{
+	unsigned long ver, manuf, impl;
+
+	__asm__ __volatile__ ("rdpr %%ver, %0"
+			      : "=&r" (ver));
+	manuf = ((ver >> 48) & 0xffff);
+	impl = ((ver >> 32) & 0xffff);
+
+	return (manuf == 0x17 && impl == 0x13);
+}
+
+struct freq_table {
+	unsigned long clock_tick_ref;
+	unsigned int ref_freq;
+};
+static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
+
+unsigned long sparc64_get_clock_tick(unsigned int cpu)
+{
+	struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
+
+	if (ft->clock_tick_ref)
+		return ft->clock_tick_ref;
+	return cpu_data(cpu).clock_tick;
+}
+EXPORT_SYMBOL(sparc64_get_clock_tick);
+
+#ifdef CONFIG_CPU_FREQ
+
+static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+				    void *data)
+{
+	struct cpufreq_freqs *freq = data;
+	unsigned int cpu = freq->cpu;
+	struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
+
+	if (!ft->ref_freq) {
+		ft->ref_freq = freq->old;
+		ft->clock_tick_ref = cpu_data(cpu).clock_tick;
+	}
+	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
+	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) {
+		cpu_data(cpu).clock_tick =
+			cpufreq_scale(ft->clock_tick_ref,
+				      ft->ref_freq,
+				      freq->new);
+	}
+
+	return 0;
+}
+
+static struct notifier_block sparc64_cpufreq_notifier_block = {
+	.notifier_call	= sparc64_cpufreq_notifier
+};
+
+static int __init register_sparc64_cpufreq_notifier(void)
+{
+
+	cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
+				  CPUFREQ_TRANSITION_NOTIFIER);
+	return 0;
+}
+
+core_initcall(register_sparc64_cpufreq_notifier);
+
+#endif /* CONFIG_CPU_FREQ */
+
+static int sparc64_next_event(unsigned long delta,
+			      struct clock_event_device *evt)
+{
+	return tick_operations.add_compare(delta) ? -ETIME : 0;
+}
+
+static int sparc64_timer_shutdown(struct clock_event_device *evt)
+{
+	tick_operations.disable_irq();
+	return 0;
+}
+
+static struct clock_event_device sparc64_clockevent = {
+	.features		= CLOCK_EVT_FEAT_ONESHOT,
+	.set_state_shutdown	= sparc64_timer_shutdown,
+	.set_next_event		= sparc64_next_event,
+	.rating			= 100,
+	.shift			= 30,
+	.irq			= -1,
+};
+static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
+
+void __irq_entry timer_interrupt(int irq, struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+	unsigned long tick_mask = tick_operations.softint_mask;
+	int cpu = smp_processor_id();
+	struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
+
+	clear_softint(tick_mask);
+
+	irq_enter();
+
+	local_cpu_data().irq0_irqs++;
+	kstat_incr_irq_this_cpu(0);
+
+	if (unlikely(!evt->event_handler)) {
+		printk(KERN_WARNING
+		       "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
+	} else
+		evt->event_handler(evt);
+
+	irq_exit();
+
+	set_irq_regs(old_regs);
+}
+
+void setup_sparc64_timer(void)
+{
+	struct clock_event_device *sevt;
+	unsigned long pstate;
+
+	/* Guarantee that the following sequences execute
+	 * uninterrupted.
+	 */
+	__asm__ __volatile__("rdpr	%%pstate, %0\n\t"
+			     "wrpr	%0, %1, %%pstate"
+			     : "=r" (pstate)
+			     : "i" (PSTATE_IE));
+
+	tick_operations.init_tick();
+
+	/* Restore PSTATE_IE. */
+	__asm__ __volatile__("wrpr	%0, 0x0, %%pstate"
+			     : /* no outputs */
+			     : "r" (pstate));
+
+	sevt = this_cpu_ptr(&sparc64_events);
+
+	memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
+	sevt->cpumask = cpumask_of(smp_processor_id());
+
+	clockevents_register_device(sevt);
+}
+
+#define SPARC64_NSEC_PER_CYC_SHIFT	10UL
+
+static struct clocksource clocksource_tick = {
+	.rating		= 100,
+	.mask		= CLOCKSOURCE_MASK(64),
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static unsigned long tb_ticks_per_usec __read_mostly;
+
+void __delay(unsigned long loops)
+{
+	unsigned long bclock = get_tick();
+
+	while ((get_tick() - bclock) < loops)
+		;
+}
+EXPORT_SYMBOL(__delay);
+
+void udelay(unsigned long usecs)
+{
+	__delay(tb_ticks_per_usec * usecs);
+}
+EXPORT_SYMBOL(udelay);
+
+static u64 clocksource_tick_read(struct clocksource *cs)
+{
+	return get_tick();
+}
+
+static void __init get_tick_patch(void)
+{
+	unsigned int *addr, *instr, i;
+	struct get_tick_patch *p;
+
+	if (tlb_type == spitfire && is_hummingbird())
+		return;
+
+	for (p = &__get_tick_patch; p < &__get_tick_patch_end; p++) {
+		instr = (tlb_type == spitfire) ? p->tick : p->stick;
+		addr = (unsigned int *)(unsigned long)p->addr;
+		for (i = 0; i < GET_TICK_NINSTR; i++) {
+			addr[i] = instr[i];
+			/* ensure that address is modified before flush */
+			wmb();
+			flushi(&addr[i]);
+		}
+	}
+}
+
+static void __init init_tick_ops(struct sparc64_tick_ops *ops)
+{
+	unsigned long freq, quotient, tick;
+
+	freq = ops->get_frequency();
+	quotient = clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT);
+	tick = ops->get_tick();
+
+	ops->offset = (tick * quotient) >> SPARC64_NSEC_PER_CYC_SHIFT;
+	ops->ticks_per_nsec_quotient = quotient;
+	ops->frequency = freq;
+	tick_operations = *ops;
+	get_tick_patch();
+}
+
+void __init time_init_early(void)
+{
+	if (tlb_type == spitfire) {
+		if (is_hummingbird()) {
+			init_tick_ops(&hbtick_operations);
+			clocksource_tick.archdata.vclock_mode = VCLOCK_NONE;
+		} else {
+			init_tick_ops(&tick_operations);
+			clocksource_tick.archdata.vclock_mode = VCLOCK_TICK;
+			vdso_fix_stick = 1;
+		}
+	} else {
+		init_tick_ops(&stick_operations);
+		clocksource_tick.archdata.vclock_mode = VCLOCK_STICK;
+	}
+}
+
+void __init time_init(void)
+{
+	unsigned long freq;
+
+	freq = tick_operations.frequency;
+	tb_ticks_per_usec = freq / USEC_PER_SEC;
+
+	clocksource_tick.name = tick_operations.name;
+	clocksource_tick.read = clocksource_tick_read;
+
+	clocksource_register_hz(&clocksource_tick, freq);
+	printk("clocksource: mult[%x] shift[%d]\n",
+	       clocksource_tick.mult, clocksource_tick.shift);
+
+	sparc64_clockevent.name = tick_operations.name;
+	clockevents_calc_mult_shift(&sparc64_clockevent, freq, 4);
+
+	sparc64_clockevent.max_delta_ns =
+		clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
+	sparc64_clockevent.max_delta_ticks = 0x7fffffffffffffffUL;
+	sparc64_clockevent.min_delta_ns =
+		clockevent_delta2ns(0xF, &sparc64_clockevent);
+	sparc64_clockevent.min_delta_ticks = 0xF;
+
+	printk("clockevent: mult[%x] shift[%d]\n",
+	       sparc64_clockevent.mult, sparc64_clockevent.shift);
+
+	setup_sparc64_timer();
+}
+
+unsigned long long sched_clock(void)
+{
+	unsigned long quotient = tick_operations.ticks_per_nsec_quotient;
+	unsigned long offset = tick_operations.offset;
+
+	/* Use barrier so the compiler emits the loads first and overlaps load
+	 * latency with reading tick, because reading %tick/%stick is a
+	 * post-sync instruction that will flush and restart subsequent
+	 * instructions after it commits.
+	 */
+	barrier();
+
+	return ((get_tick() * quotient) >> SPARC64_NSEC_PER_CYC_SHIFT) - offset;
+}
+
+int read_current_timer(unsigned long *timer_val)
+{
+	*timer_val = get_tick();
+	return 0;
+}