mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 03:14:42 +07:00
6bb27d7349
Now that the only field in struct sys_timer is .init, delete the struct, and replace the machine descriptor .timer field with the initialization function itself. This will enable moving timer drivers into drivers/clocksource without having to place a public prototype of each struct sys_timer object into include/linux; the intent is to create a single of_clocksource_init() function that determines which timer driver to initialize by scanning the device dtree, much like the proposed irqchip_init() at: http://www.spinics.net/lists/arm-kernel/msg203686.html Includes mach-omap2 fixes from Igor Grinberg. Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Stephen Warren <swarren@nvidia.com>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2012 Altera Corporation
|
|
* Copyright (c) 2011 Picochip Ltd., Jamie Iles
|
|
*
|
|
* Modified from mach-picoxcell/time.c
|
|
*
|
|
* 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/>.
|
|
*/
|
|
#include <linux/dw_apb_timer.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
|
|
#include <asm/mach/time.h>
|
|
#include <asm/sched_clock.h>
|
|
|
|
static void timer_get_base_and_rate(struct device_node *np,
|
|
void __iomem **base, u32 *rate)
|
|
{
|
|
*base = of_iomap(np, 0);
|
|
|
|
if (!*base)
|
|
panic("Unable to map regs for %s", np->name);
|
|
|
|
if (of_property_read_u32(np, "clock-freq", rate) &&
|
|
of_property_read_u32(np, "clock-frequency", rate))
|
|
panic("No clock-frequency property for %s", np->name);
|
|
}
|
|
|
|
static void add_clockevent(struct device_node *event_timer)
|
|
{
|
|
void __iomem *iobase;
|
|
struct dw_apb_clock_event_device *ced;
|
|
u32 irq, rate;
|
|
|
|
irq = irq_of_parse_and_map(event_timer, 0);
|
|
if (irq == NO_IRQ)
|
|
panic("No IRQ for clock event timer");
|
|
|
|
timer_get_base_and_rate(event_timer, &iobase, &rate);
|
|
|
|
ced = dw_apb_clockevent_init(0, event_timer->name, 300, iobase, irq,
|
|
rate);
|
|
if (!ced)
|
|
panic("Unable to initialise clockevent device");
|
|
|
|
dw_apb_clockevent_register(ced);
|
|
}
|
|
|
|
static void add_clocksource(struct device_node *source_timer)
|
|
{
|
|
void __iomem *iobase;
|
|
struct dw_apb_clocksource *cs;
|
|
u32 rate;
|
|
|
|
timer_get_base_and_rate(source_timer, &iobase, &rate);
|
|
|
|
cs = dw_apb_clocksource_init(300, source_timer->name, iobase, rate);
|
|
if (!cs)
|
|
panic("Unable to initialise clocksource device");
|
|
|
|
dw_apb_clocksource_start(cs);
|
|
dw_apb_clocksource_register(cs);
|
|
}
|
|
|
|
static void __iomem *sched_io_base;
|
|
|
|
static u32 read_sched_clock(void)
|
|
{
|
|
return __raw_readl(sched_io_base);
|
|
}
|
|
|
|
static const struct of_device_id sptimer_ids[] __initconst = {
|
|
{ .compatible = "picochip,pc3x2-rtc" },
|
|
{ .compatible = "snps,dw-apb-timer-sp" },
|
|
{ /* Sentinel */ },
|
|
};
|
|
|
|
static void init_sched_clock(void)
|
|
{
|
|
struct device_node *sched_timer;
|
|
u32 rate;
|
|
|
|
sched_timer = of_find_matching_node(NULL, sptimer_ids);
|
|
if (!sched_timer)
|
|
panic("No RTC for sched clock to use");
|
|
|
|
timer_get_base_and_rate(sched_timer, &sched_io_base, &rate);
|
|
of_node_put(sched_timer);
|
|
|
|
setup_sched_clock(read_sched_clock, 32, rate);
|
|
}
|
|
|
|
static const struct of_device_id osctimer_ids[] __initconst = {
|
|
{ .compatible = "picochip,pc3x2-timer" },
|
|
{ .compatible = "snps,dw-apb-timer-osc" },
|
|
{},
|
|
};
|
|
|
|
void __init dw_apb_timer_init(void)
|
|
{
|
|
struct device_node *event_timer, *source_timer;
|
|
|
|
event_timer = of_find_matching_node(NULL, osctimer_ids);
|
|
if (!event_timer)
|
|
panic("No timer for clockevent");
|
|
add_clockevent(event_timer);
|
|
|
|
source_timer = of_find_matching_node(event_timer, osctimer_ids);
|
|
if (!source_timer)
|
|
panic("No timer for clocksource");
|
|
add_clocksource(source_timer);
|
|
|
|
of_node_put(source_timer);
|
|
|
|
init_sched_clock();
|
|
}
|