u-boot/arch/arm/cpu/arm926ejs/spear/timer.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

122 lines
2.6 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/spr_gpt.h>
#include <asm/arch/spr_misc.h>
#define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ)
#define READ_TIMER() (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING)
static struct gpt_regs *const gpt_regs_p =
(struct gpt_regs *)CONFIG_SPEAR_TIMERBASE;
static struct misc_regs *const misc_regs_p =
(struct misc_regs *)CONFIG_SPEAR_MISCBASE;
DECLARE_GLOBAL_DATA_PTR;
#define timestamp gd->arch.tbl
#define lastdec gd->arch.lastinc
int timer_init(void)
{
u32 synth;
/* Prescaler setting */
#if defined(CONFIG_SPEAR3XX)
writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg);
synth = MISC_GPT4SYNTH;
#elif defined(CONFIG_SPEAR600)
writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg);
synth = MISC_GPT3SYNTH;
#else
# error Incorrect config. Can only be SPEAR{600|300|310|320}
#endif
writel(readl(&misc_regs_p->periph_clk_cfg) | synth,
&misc_regs_p->periph_clk_cfg);
/* disable timers */
writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control);
/* load value for free running */
writel(GPT_FREE_RUNNING, &gpt_regs_p->compare);
/* auto reload, start timer */
writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control);
/* Reset the timer */
lastdec = READ_TIMER();
timestamp = 0;
return 0;
}
/*
* timer without interrupts
*/
ulong get_timer(ulong base)
{
return (get_timer_masked() / GPT_RESOLUTION) - base;
}
void __udelay(unsigned long usec)
{
ulong tmo;
ulong start = get_timer_masked();
ulong tenudelcnt = CONFIG_SPEAR_HZ_CLOCK / (1000 * 100);
ulong rndoff;
rndoff = (usec % 10) ? 1 : 0;
/* tenudelcnt timer tick gives 10 microsecconds delay */
tmo = ((usec / 10) + rndoff) * tenudelcnt;
while ((ulong) (get_timer_masked() - start) < tmo)
;
}
ulong get_timer_masked(void)
{
ulong now = READ_TIMER();
if (now >= lastdec) {
/* normal mode */
timestamp += now - lastdec;
} else {
/* we have an overflow ... */
timestamp += now + GPT_FREE_RUNNING - lastdec;
}
lastdec = now;
return timestamp;
}
void udelay_masked(unsigned long usec)
{
return udelay(usec);
}
/*
* This function is derived from PowerPC code (read timebase as long long).
* On ARM it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return CONFIG_SPEAR_HZ;
}