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ARM: mmp/mmp2: dt: enable the clock 

The device-tree booted MMP2 needs to enable the timer clock, otherwise
it would stop ticking when the boot finishes.

It can also use the clock rate from the clk, the non-DT boards need to
keep using the hardcoded rates.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Lubomir Rintel 2018-11-28 18:53:20 +01:00 committed by Olof Johansson
parent e78ebdcb6e
commit f36797ee43
4 changed files with 23 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mach-mmp/common.h
View File

@ -2,7 +2,7 @@
#include <linux/reboot.h>
#define ARRAY_AND_SIZE(x) (x), ARRAY_SIZE(x)
extern void timer_init(int irq);
extern void timer_init(int irq, unsigned long rate);
extern void __init mmp_map_io(void);
extern void mmp_restart(enum reboot_mode, const char *);

2
arch/arm/mach-mmp/mmp2.c
View File

@ -134,7 +134,7 @@ void __init mmp2_timer_init(void)
clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(1);
__raw_writel(clk_rst, APBC_TIMERS);
timer_init(IRQ_MMP2_TIMER1);
timer_init(IRQ_MMP2_TIMER1, 6500000);
}
/* on-chip devices */

2
arch/arm/mach-mmp/pxa168.c
View File

@ -79,7 +79,7 @@ void __init pxa168_timer_init(void)
/* 3.25MHz, bus/functional clock enabled, release reset */
__raw_writel(TIMER_CLK_RST, APBC_TIMERS);
timer_init(IRQ_PXA168_TIMER1);
timer_init(IRQ_PXA168_TIMER1, 6500000);
}
void pxa168_clear_keypad_wakeup(void)

32
arch/arm/mach-mmp/time.c
View File

@ -22,6 +22,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/clockchips.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/irq.h>
@ -38,12 +39,6 @@
#include "cputype.h"
#include "clock.h"
#ifdef CONFIG_CPU_MMP2
#define MMP_CLOCK_FREQ 6500000
#else
#define MMP_CLOCK_FREQ 3250000
#endif
#define TIMERS_VIRT_BASE TIMERS1_VIRT_BASE
#define MAX_DELTA (0xfffffffe)
@ -189,19 +184,18 @@ static struct irqaction timer_irq = {
.dev_id = &ckevt,
};
void __init timer_init(int irq)
void __init timer_init(int irq, unsigned long rate)
{
timer_config();
sched_clock_register(mmp_read_sched_clock, 32, MMP_CLOCK_FREQ);
sched_clock_register(mmp_read_sched_clock, 32, rate);
ckevt.cpumask = cpumask_of(0);
setup_irq(irq, &timer_irq);
clocksource_register_hz(&cksrc, MMP_CLOCK_FREQ);
clockevents_config_and_register(&ckevt, MMP_CLOCK_FREQ,
MIN_DELTA, MAX_DELTA);
clocksource_register_hz(&cksrc, rate);
clockevents_config_and_register(&ckevt, rate, MIN_DELTA, MAX_DELTA);
}
#ifdef CONFIG_OF
@ -213,7 +207,9 @@ static const struct of_device_id mmp_timer_dt_ids[] = {
void __init mmp_dt_init_timer(void)
{
struct device_node *np;
struct clk *clk;
int irq, ret;
unsigned long rate;
np = of_find_matching_node(NULL, mmp_timer_dt_ids);
if (!np) {
@ -221,6 +217,18 @@ void __init mmp_dt_init_timer(void)
goto out;
}
clk = of_clk_get(np, 0);
if (!IS_ERR(clk)) {
ret = clk_prepare_enable(clk);
if (ret)
goto out;
rate = clk_get_rate(clk) / 2;
} else if (cpu_is_pj4()) {
rate = 6500000;
} else {
rate = 3250000;
}
irq = irq_of_parse_and_map(np, 0);
if (!irq) {
ret = -EINVAL;
@ -231,7 +239,7 @@ void __init mmp_dt_init_timer(void)
ret = -ENOMEM;
goto out;
}
timer_init(irq);
timer_init(irq, rate);
return;
out:
pr_err("Failed to get timer from device tree with error:%d\n", ret);