mtk-lk/platform/mt6768/timer.c

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#include <sys/types.h>
#include <debug.h>
#include <err.h>
#include <reg.h>
#include <platform/timer.h>

#include <platform/mt_typedefs.h>
#include <platform/mt_reg_base.h>
#include <platform/mt_gpt.h>
#include <platform/mt_irq.h>

#include <kernel/thread.h>
#include <mt_gic.h>                 // for mt_irq_ack(), mt_irq_set_sens(), mt_irq_set_polarity()


static volatile time_t ticks = 0;
static time_t tick_interval;

static platform_timer_callback time_callback;
static void *callback_arg;

#define AP_PERI_GLOBALCON_PDN0 (PERICFG_BASE+0x10)

#ifdef MACH_FPGA
#define TIMER_TICK_RATE 6000000
#else
#define TIMER_TICK_RATE 32768
#endif

static enum handler_return timer_irq(void *arg)
{
	ticks += tick_interval;
	return time_callback(callback_arg, ticks);
}

void lk_scheduler(void)
{
	//static enum handler_return ret;

	/* ack GPT5 irq */
	/* configure gpt5 to use 13MHZ clock during irq ack.
        * Reason: In 32K domain, the de-assert signal to GIC might delay several clocks. So
        *         there must have delay between ack GTP5 irq and ack GIC irq. Ohterwise the
        *         irq will come twice at one tick point.
        *         Switching to 13M, ack gpt5 irq flow speeds up to avoid problem.
        */
	DRV_WriteReg32(GPT5_CLK_REG , 0x00);
	DRV_WriteReg32(GPT_IRQACK_REG, 0x10);
	DRV_WriteReg32(GPT5_CON_REG, GPT_CLEAR);
	DRV_WriteReg32(GPT5_CON_REG, GPT_DISABLE);
	DRV_WriteReg32(GPT5_CLK_REG , 0x10);

	timer_irq(0);

	/*
	 * CAUTION! The de-assert signal to GIC might delay serveral clocks.
	 * Here must have enough delay to make sure the GPT signal had arrived GIC.
	 */
	/* ack GIC irq */
	mt_irq_ack(MT_GPT_IRQ_ID);

	/* enable GPT5 */
	DRV_WriteReg32(GPT5_CON_REG, GPT_ENABLE|GPT_MODE4_ONE_SHOT);

}

status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, time_t interval)
{
	time_callback = callback;
	tick_interval = interval;
	callback_arg  = arg;

	DRV_WriteReg32(GPT_IRQEN_REG, 0);
	DRV_WriteReg32(GPT_IRQACK_REG, 0x3f);

	mt_irq_set_sens(MT_GPT_IRQ_ID, MT65xx_LEVEL_SENSITIVE);
	mt_irq_set_polarity(MT_GPT_IRQ_ID, MT65xx_POLARITY_LOW);

	DRV_WriteReg32(GPT5_CON_REG, 0x02);
	DRV_WriteReg32(GPT_IRQACK_REG, 0x10);
	DRV_WriteReg32(GPT5_CLK_REG , 0x10);

	DRV_WriteReg32(GPT5_COMPARE_REG, TIMER_TICK_RATE*interval/1000);
	DRV_WriteReg32(GPT_IRQEN_REG, 0x10);

	mt_irq_unmask(MT_GPT_IRQ_ID);

	DRV_WriteReg32(GPT5_CON_REG, GPT_ENABLE|GPT_MODE4_ONE_SHOT);

	return NO_ERROR;
}

time_t current_time(void)
{
	return ticks;
}

static void gpt_power_on (bool bPowerOn)
{
	if (!bPowerOn) {
		DRV_SetReg32(AP_PERI_GLOBALCON_PDN0, 1<<13);
	} else {
		DRV_ClrReg32(AP_PERI_GLOBALCON_PDN0, 1<<13);
	}
}

void platform_early_init_timer(void)
{
	//dprintf(SPEW, "platform_early_init_timer\n");

	gpt_power_on(1);
}