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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Integrator/AP timer driver
* Copyright (C) 2000-2003 Deep Blue Solutions Ltd
* Copyright (c) 2014, Linaro Limited
*/
#include <linux/clk.h>
#include <linux/clocksource.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/sched_clock.h>
#include "timer-sp.h"
static void __iomem * sched_clk_base;
static u64 notrace integrator_read_sched_clock(void)
{
return -readl(sched_clk_base + TIMER_VALUE);
}
static int __init integrator_clocksource_init(unsigned long inrate,
void __iomem *base)
{
u32 ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
unsigned long rate = inrate;
int ret;
if (rate >= 1500000) {
rate /= 16;
ctrl |= TIMER_CTRL_DIV16;
}
writel(0xffff, base + TIMER_LOAD);
writel(ctrl, base + TIMER_CTRL);
ret = clocksource_mmio_init(base + TIMER_VALUE, "timer2",
rate, 200, 16, clocksource_mmio_readl_down);
if (ret)
return ret;
sched_clk_base = base;
sched_clock_register(integrator_read_sched_clock, 16, rate);
return 0;
}
static unsigned long timer_reload;
static void __iomem * clkevt_base;
/*
* IRQ handler for the timer
*/
static irqreturn_t integrator_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = dev_id;
/* clear the interrupt */
writel(1, clkevt_base + TIMER_INTCLR);
evt->event_handler(evt);
return IRQ_HANDLED;
}
static int clkevt_shutdown(struct clock_event_device *evt)
{
u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;
/* Disable timer */
writel(ctrl, clkevt_base + TIMER_CTRL);
return 0;
}
static int clkevt_set_oneshot(struct clock_event_device *evt)
{
u32 ctrl = readl(clkevt_base + TIMER_CTRL) &
~(TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC);
/* Leave the timer disabled, .set_next_event will enable it */
writel(ctrl, clkevt_base + TIMER_CTRL);
return 0;
}
static int clkevt_set_periodic(struct clock_event_device *evt)
{
u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;
/* Disable timer */
writel(ctrl, clkevt_base + TIMER_CTRL);
/* Enable the timer and start the periodic tick */
writel(timer_reload, clkevt_base + TIMER_LOAD);
ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
writel(ctrl, clkevt_base + TIMER_CTRL);
return 0;
}
static int clkevt_set_next_event(unsigned long next, struct clock_event_device *evt)
{
unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
writel(ctrl & ~TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
writel(next, clkevt_base + TIMER_LOAD);
writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
return 0;
}
static struct clock_event_device integrator_clockevent = {
.name = "timer1",
.features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.set_state_shutdown = clkevt_shutdown,
.set_state_periodic = clkevt_set_periodic,
.set_state_oneshot = clkevt_set_oneshot,
.tick_resume = clkevt_shutdown,
.set_next_event = clkevt_set_next_event,
.rating = 300,
};
static struct irqaction integrator_timer_irq = {
.name = "timer",
.flags = IRQF_TIMER | IRQF_IRQPOLL,
.handler = integrator_timer_interrupt,
.dev_id = &integrator_clockevent,
};
static int integrator_clockevent_init(unsigned long inrate,
void __iomem *base, int irq)
{
unsigned long rate = inrate;
unsigned int ctrl = 0;
int ret;
clkevt_base = base;
/* Calculate and program a divisor */
if (rate > 0x100000 * HZ) {
rate /= 256;
ctrl |= TIMER_CTRL_DIV256;
} else if (rate > 0x10000 * HZ) {
rate /= 16;
ctrl |= TIMER_CTRL_DIV16;
}
timer_reload = rate / HZ;
writel(ctrl, clkevt_base + TIMER_CTRL);
ret = setup_irq(irq, &integrator_timer_irq);
if (ret)
return ret;
clockevents_config_and_register(&integrator_clockevent,
rate,
1,
0xffffU);
return 0;
}
static int __init integrator_ap_timer_init_of(struct device_node *node)
{
const char *path;
void __iomem *base;
int err;
int irq;
struct clk *clk;
unsigned long rate;
struct device_node *alias_node;
base = of_io_request_and_map(node, 0, "integrator-timer");
if (IS_ERR(base))
return PTR_ERR(base);
clk = of_clk_get(node, 0);
if (IS_ERR(clk)) {
pr_err("No clock for %pOFn\n", node);
return PTR_ERR(clk);
}
clk_prepare_enable(clk);
rate = clk_get_rate(clk);
writel(0, base + TIMER_CTRL);
err = of_property_read_string(of_aliases,
"arm,timer-primary", &path);
if (err) {
pr_warn("Failed to read property\n");
return err;
}
alias_node = of_find_node_by_path(path);
/*
* The pointer is used as an identifier not as a pointer, we
* can drop the refcount on the of__node immediately after
* getting it.
*/
of_node_put(alias_node);
if (node == alias_node)
/* The primary timer lacks IRQ, use as clocksource */
return integrator_clocksource_init(rate, base);
err = of_property_read_string(of_aliases,
"arm,timer-secondary", &path);
if (err) {
pr_warn("Failed to read property\n");
return err;
}
alias_node = of_find_node_by_path(path);
of_node_put(alias_node);
if (node == alias_node) {
/* The secondary timer will drive the clock event */
irq = irq_of_parse_and_map(node, 0);
return integrator_clockevent_init(rate, base, irq);
}
pr_info("Timer @%p unused\n", base);
clk_disable_unprepare(clk);
return 0;
}
TIMER_OF_DECLARE(integrator_ap_timer, "arm,integrator-timer",
integrator_ap_timer_init_of);
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