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/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Clocks, PLL and power settings */
#include "clock.h"
#include "common.h"
#include "registers.h"
#include "task.h"
#include "util.h"
void clock_init(void)
{
/* Set VREQ to HW mode */
SCP_CPU_VREQ = CPU_VREQ_HW_MODE;
SCP_SECURE_CTRL &= ~ENABLE_SPM_MASK_VREQ;
/* Set DDREN auto mode */
SCP_SYS_CTRL |= AUTO_DDREN;
/* Initialize 26MHz system clock counter reset value to 1. */
SCP_CLK_SYS_VAL =
(SCP_CLK_SYS_VAL & ~CLK_SYS_VAL_MASK) | CLK_SYS_VAL(1);
/* Initialize high frequency ULPOSC counter reset value to 1. */
SCP_CLK_HIGH_VAL =
(SCP_CLK_HIGH_VAL & ~CLK_HIGH_VAL_MASK) | CLK_HIGH_VAL(1);
/* Initialize sleep mode control VREQ counter. */
SCP_CLK_SLEEP_CTRL =
(SCP_CLK_SLEEP_CTRL & ~VREQ_COUNTER_MASK) | VREQ_COUNTER_VAL(1);
/* Set normal wake clock */
SCP_WAKE_CKSW &= ~WAKE_CKSW_SEL_NORMAL_MASK;
/* Enable fast wakeup support */
SCP_CLK_SLEEP = 0;
SCP_CLK_ON_CTRL = (SCP_CLK_ON_CTRL & ~HIGH_FINAL_VAL_MASK) |
HIGH_FINAL_VAL_DEFAULT;
SCP_FAST_WAKE_CNT_END =
(SCP_FAST_WAKE_CNT_END & ~FAST_WAKE_CNT_END_MASK) |
FAST_WAKE_CNT_END_DEFAULT;
/* Set slow wake clock */
SCP_WAKE_CKSW = (SCP_WAKE_CKSW & ~WAKE_CKSW_SEL_SLOW_MASK) |
WAKE_CKSW_SEL_SLOW_DEFAULT;
/* Select CLK_HIGH as wakeup clock */
SCP_CLK_SLOW_SEL = (SCP_CLK_SLOW_SEL &
~(CKSW_SEL_SLOW_MASK | CKSW_SEL_SLOW_DIV_MASK)) |
CKSW_SEL_SLOW_ULPOSC2_CLK;
/*
* Set legacy wakeup
* - disable SPM sleep control
* - disable SCP sleep mode
*/
SCP_CLK_SLEEP_CTRL &= ~(EN_SLEEP_CTRL | SPM_SLEEP_MODE);
task_enable_irq(SCP_IRQ_CLOCK);
task_enable_irq(SCP_IRQ_CLOCK2);
}
void clock_control_irq(void)
{
/* Read ack CLK_IRQ */
(SCP_CLK_IRQ_ACK);
task_clear_pending_irq(SCP_IRQ_CLOCK);
}
DECLARE_IRQ(SCP_IRQ_CLOCK, clock_control_irq, 3);
void clock_fast_wakeup_irq(void)
{
/* Ack fast wakeup */
SCP_SLEEP_IRQ2 = 1;
task_clear_pending_irq(SCP_IRQ_CLOCK2);
}
DECLARE_IRQ(SCP_IRQ_CLOCK2, clock_fast_wakeup_irq, 3);
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