diff options
Diffstat (limited to 'chip/max32660/hwtimer_chip.c')
| -rw-r--r-- | chip/max32660/hwtimer_chip.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/chip/max32660/hwtimer_chip.c b/chip/max32660/hwtimer_chip.c deleted file mode 100644 index 5417e161b2..0000000000 --- a/chip/max32660/hwtimer_chip.c +++ /dev/null @@ -1,230 +0,0 @@ -/* Copyright 2019 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. - */ - -/* MAX32660 HW Timer module for Chrome EC */ - -#include "clock.h" -#include "console.h" -#include "common.h" -#include "hooks.h" -#include "hwtimer.h" -#include "task.h" -#include "timer.h" -#include "registers.h" -#include "tmr_regs.h" -#include "gcr_regs.h" - -/* Define the rollover timer */ -#define TMR_ROLLOVER MXC_TMR0 -#define TMR_ROLLOVER_IRQ EC_TMR0_IRQn - -/* Define the event timer */ -#define TMR_EVENT MXC_TMR1 -#define TMR_EVENT_IRQ EC_TMR1_IRQn - -#define ROLLOVER_EVENT 1 -#define NOT_ROLLOVER_EVENT 0 - -#define TMR_PRESCALER MXC_V_TMR_CN_PRES_DIV8 -#define TMR_DIV (1 << TMR_PRESCALER) - -/* The frequency of timer using the prescaler */ -#define TIMER_FREQ_HZ (PeripheralClock / TMR_DIV) - -/* Console output macros */ -#define CPUTS(outstr) cputs(CC_SYSTEM, outstr) -#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ##args) - -static uint32_t last_deadline; - -/* brief Timer prescaler values */ -enum tmr_pres { - TMR_PRES_1 = MXC_V_TMR_CN_PRES_DIV1, /// Divide input clock by 1 - TMR_PRES_2 = MXC_V_TMR_CN_PRES_DIV2, /// Divide input clock by 2 - TMR_PRES_4 = MXC_V_TMR_CN_PRES_DIV4, /// Divide input clock by 4 - TMR_PRES_8 = MXC_V_TMR_CN_PRES_DIV8, /// Divide input clock by 8 - TMR_PRES_16 = MXC_V_TMR_CN_PRES_DIV16, /// Divide input clock by 16 - TMR_PRES_32 = MXC_V_TMR_CN_PRES_DIV32, /// Divide input clock by 32 - TMR_PRES_64 = MXC_V_TMR_CN_PRES_DIV64, /// Divide input clock by 64 - TMR_PRES_128 = MXC_V_TMR_CN_PRES_DIV128, /// Divide input clock by 128 - TMR_PRES_256 = - (0x20 << MXC_F_TMR_CN_PRES_POS), /// Divide input clock by 256 - TMR_PRES_512 = - (0x21 << MXC_F_TMR_CN_PRES_POS), /// Divide input clock by 512 - TMR_PRES_1024 = - (0x22 << MXC_F_TMR_CN_PRES_POS), /// Divide input clock by 1024 - TMR_PRES_2048 = - (0x23 << MXC_F_TMR_CN_PRES_POS), /// Divide input clock by 2048 - TMR_PRES_4096 = - (0x24 << MXC_F_TMR_CN_PRES_POS), /// Divide input clock by 4096 -}; - -/* Timer modes */ -enum tmr_mode { - TMR_MODE_ONESHOT = MXC_V_TMR_CN_TMODE_ONESHOT, /// Timer Mode ONESHOT - TMR_MODE_CONTINUOUS = - MXC_V_TMR_CN_TMODE_CONTINUOUS, /// Timer Mode CONTINUOUS - TMR_MODE_COUNTER = MXC_V_TMR_CN_TMODE_COUNTER, /// Timer Mode COUNTER - TMR_MODE_PWM = MXC_V_TMR_CN_TMODE_PWM, /// Timer Mode PWM - TMR_MODE_CAPTURE = MXC_V_TMR_CN_TMODE_CAPTURE, /// Timer Mode CAPTURE - TMR_MODE_COMPARE = MXC_V_TMR_CN_TMODE_COMPARE, /// Timer Mode COMPARE - TMR_MODE_GATED = MXC_V_TMR_CN_TMODE_GATED, /// Timer Mode GATED - TMR_MODE_CAPTURE_COMPARE = - MXC_V_TMR_CN_TMODE_CAPTURECOMPARE /// Timer Mode CAPTURECOMPARE -}; - -/* - * Calculate the number of microseconds for a given timer tick - */ -static inline uint32_t ticks_to_usecs(uint32_t ticks) -{ - return (uint64_t)ticks * SECOND / TIMER_FREQ_HZ; -} - -/* - * Calculate the number of timer ticks for a given microsecond value - */ -static inline uint32_t usecs_to_ticks(uint32_t usecs) -{ - return ((uint64_t)(usecs)*TIMER_FREQ_HZ / SECOND); -} - -void __hw_clock_event_set(uint32_t deadline) -{ - uint32_t event_time_us; - uint32_t event_time_ticks; - uint32_t time_now; - - last_deadline = deadline; - time_now = __hw_clock_source_read(); - - /* check if the deadline has rolled over */ - if (deadline < time_now) { - event_time_us = (0xFFFFFFFF - time_now) + deadline; - } else { - /* How long from the current time to the deadline? */ - event_time_us = (deadline - __hw_clock_source_read()); - } - - /* Convert event_time to ticks rounding up */ - event_time_ticks = usecs_to_ticks(event_time_us) + 1; - - /* set the event time into the timer compare */ - TMR_EVENT->cmp = event_time_ticks; - /* zero out the timer */ - TMR_EVENT->cnt = 0; - TMR_EVENT->cn |= MXC_F_TMR_CN_TEN; -} - -uint32_t __hw_clock_event_get(void) -{ - return last_deadline; -} - -void __hw_clock_event_clear(void) -{ - TMR_EVENT->cn &= ~(MXC_F_TMR_CN_TEN); -} - -uint32_t __hw_clock_source_read(void) -{ - uint32_t timer_count_ticks; - - /* Read the timer value and return the results in microseconds */ - timer_count_ticks = TMR_ROLLOVER->cnt; - return ticks_to_usecs(timer_count_ticks); -} - -void __hw_clock_source_set(uint32_t ts) -{ - uint32_t timer_count_ticks; - timer_count_ticks = usecs_to_ticks(ts); - TMR_ROLLOVER->cnt = timer_count_ticks; -} - -/** - * Interrupt handler for Timer - */ -static void __timer_event_isr(void) -{ - /* Clear the event timer */ - TMR_EVENT->intr = MXC_F_TMR_INTR_IRQ_CLR; - /* Process the timer, pass in that this was NOT a rollover event */ - if (TMR_ROLLOVER->intr) { - TMR_ROLLOVER->intr = MXC_F_TMR_INTR_IRQ_CLR; - process_timers(ROLLOVER_EVENT); - } else { - process_timers(NOT_ROLLOVER_EVENT); - } -} -/* - * Declare the EC Timer lower in priority than the I2C interrupt. This - * allows the I2C driver to process time sensitive interrupts. - */ -DECLARE_IRQ(EC_TMR1_IRQn, __timer_event_isr, 2); - -static void init_timer(mxc_tmr_regs_t *timer, enum tmr_pres prescaler, - enum tmr_mode mode, uint32_t count) -{ - /* Disable the Timer */ - timer->cn &= ~(MXC_F_TMR_CN_TEN); - - if (timer == MXC_TMR0) { - /* Enable Timer 0 Clock */ - MXC_GCR->perckcn0 &= ~(MXC_F_GCR_PERCKCN0_T0D); - } else if (timer == MXC_TMR1) { - /* Enable Timer 1 Clock */ - MXC_GCR->perckcn0 &= ~(MXC_F_GCR_PERCKCN0_T1D); - } else if (timer == MXC_TMR2) { - /* Enable Timer 2 Clock */ - MXC_GCR->perckcn0 &= ~(MXC_F_GCR_PERCKCN0_T2D); - } - - /* Disable timer and clear settings */ - timer->cn = 0; - - /* Clear interrupt flag */ - timer->intr = MXC_F_TMR_INTR_IRQ_CLR; - - /* Set the prescaler */ - timer->cn = (prescaler << MXC_F_TMR_CN_PRES_POS); - - /* Configure the timer */ - timer->cn = (timer->cn & ~(MXC_F_TMR_CN_TMODE | MXC_F_TMR_CN_TPOL)) | - ((mode << MXC_F_TMR_CN_TMODE_POS) & MXC_F_TMR_CN_TMODE) | - ((0 << MXC_F_TMR_CN_TPOL_POS) & MXC_F_TMR_CN_TPOL); - - timer->cnt = 0x1; - timer->cmp = count; -} - -int __hw_clock_source_init(uint32_t start_t) -{ - /* Initialize two timers, one for the OS Rollover and one for the OS - * Events */ - init_timer(TMR_ROLLOVER, TMR_PRESCALER, TMR_MODE_CONTINUOUS, - 0xffffffff); - init_timer(TMR_EVENT, TMR_PRESCALER, TMR_MODE_COMPARE, 0x0); - __hw_clock_source_set(start_t); - - /* Enable the timers */ - TMR_ROLLOVER->cn |= MXC_F_TMR_CN_TEN; - TMR_EVENT->cn |= MXC_F_TMR_CN_TEN; - - /* Enable the IRQ */ - task_enable_irq(TMR_EVENT_IRQ); - - /* Return the Event timer IRQ number (NOT the Rollover IRQ) */ - return TMR_EVENT_IRQ; -} - -static int hwtimer_display(int argc, char **argv) -{ - CPRINTS(" TMR_EVENT count 0x%08x", TMR_EVENT->cnt); - CPRINTS(" TMR_ROLLOVER count 0x%08x", TMR_ROLLOVER->cnt); - return EC_SUCCESS; -} -DECLARE_CONSOLE_COMMAND(hwtimer, hwtimer_display, "hwtimer", - "Display hwtimer counts"); |