static ssize_t
kona_timer_module_cfg(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
char name[255];
unsigned int rate;
if (sscanf(buf, "%s %d", name, &rate) == 2) {
pr_info("timer name:%s rate %d\n", name, rate);
/*
* Assuming that kona_timer_modules_init has happend already
* This is safe because this function is called during
* system timer init itself
*/
if (kona_timer_module_set_rate(name, rate) < 0) {
pr_err("kona_timer_module_cfg: Unable to set rate\n");
return n;
}
pr_info("kona_timer_module_cfg: Configured the module with "
"rate %d\n", rate);
return n;
}
pr_info("\nusage: echo [timer_name(aon-timer/slave-timer)]"
"[rate 32000 (32KHz), 1000000 (1MHz), 19500000 (19.5MHz)] > /sys/bcm/timer_module_cfg\n");
return -EINVAL;
}
static void __init timers_init(struct gp_timer_setup *gpt_setup)
{
struct timer_ch_cfg evt_tm_cfg;
if (kona_timer_modules_init() < 0) {
pr_err
("timers_init: Unable to initialize kona timer modules \r\n");
return;
}
if (kona_timer_module_set_rate(gpt_setup->name, gpt_setup->rate) < 0) {
pr_err("timers_init: Unable to set the clock rate to %d \r\n",
gpt_setup->rate);
return;
}
/* Initialize Event timer */
gpt_evt = kona_timer_request(gpt_setup->name, gpt_setup->ch_num);
if (gpt_evt == NULL) {
pr_err("timers_init: Unable to get GPT timer for event\r\n");
return;
}
pr_info("timers_init: === SYSTEM TIMER NAME: %s CHANNEL NUMBER %d \
RATE %d \r\n", gpt_setup->name, gpt_setup->ch_num, gpt_setup->rate);
evt_tm_cfg.mode = MODE_ONESHOT;
evt_tm_cfg.arg = &clockevent_gptimer;
evt_tm_cfg.cb = gptimer_interrupt_cb;
kona_timer_config(gpt_evt, &evt_tm_cfg);
gptimer_set_next_event((CLOCK_TICK_RATE / HZ), NULL);
/*
* IMPORTANT
* Note that we don't want to waste a channel for clock source. In Kona
*timer module by default there is a counter that keeps counting
*irrespective of the channels. So instead of implementing a periodic
*timer using a channel (which in the HW is not peridoic) we can
*simply read the counters of the timer that is used for event and
*send it for source. The only catch is that this timer should not be
*stopped by PM or any other sub-systems.
*/
gpt_src = gpt_evt;
return;
}
