/**
* Preset PWM operation clock.
*
* @param none
* @return none
* @notes changed when initial or HOOK_FREQ_CHANGE command
*/
void pwm_freq_changed(void)
{
uint32_t prescaler_divider = 0;
if (pwm_init_ch == PWM_CH_FAN) {
/*
* Using PWM Frequency and Resolution we calculate
* prescaler for input clock
*/
/* (Benson_TBD_9) pwm_clock/freq/resolution not confirm */
#ifdef CONFIG_PWM_INPUT_LFCLK
prescaler_divider = (uint32_t)(32768 /
pwm_channels[pwm_init_ch].freq);
#else
prescaler_divider = (uint32_t)(clock_get_apb2_freq()
/ pwm_channels[pwm_init_ch].freq);
#endif
} else {
prescaler_divider = (uint32_t)(clock_get_apb2_freq()
/ pwm_channels[pwm_init_ch].freq);
}
/* Set clock prescalre divider to ADC module*/
if (prescaler_divider >= 1)
prescaler_divider = prescaler_divider - 1;
if (prescaler_divider > 0xFFFF)
prescaler_divider = 0xFFFF;
/* Configure computed prescaler and resolution */
NPCX_PRSC(pwm_channels[pwm_init_ch].channel) =
(uint16_t)prescaler_divider;
}
/* Hooks */
static void i2c_freq_changed(void)
{
int freq, i;
for (i = 0; i < i2c_ports_used; i++) {
int bus_freq = i2c_ports[i].kbps;
int ctrl = i2c_port_to_controller(i2c_ports[i].port);
int scl_time;
/* SMB0/1 use core clock & SMB2/3 use apb2 clock */
if (ctrl < 2)
freq = clock_get_freq();
else
freq = clock_get_apb2_freq();
/* use Fast Mode */
SET_BIT(NPCX_SMBCTL3(ctrl) , NPCX_SMBCTL3_400K);
/*
* Set SCLLT/SCLHT:
* tSCLL = 2 * SCLLT7-0 * tCLK
* tSCLH = 2 * SCLHT7-0 * tCLK
* (tSCLL+tSCLH) = 4 * SCLH(L)T * tCLK if tSCLL == tSCLH
* SCLH(L)T = T(SCL)/4/T(CLK) = FREQ(CLK)/4/FREQ(SCL)
*/
scl_time = (freq/1000) / (bus_freq * 4); /* bus_freq is KHz */
/* set SCL High/Low time */
NPCX_SMBSCLLT(ctrl) = scl_time;
NPCX_SMBSCLHT(ctrl) = scl_time;
}
}
static void update_prescaler(void)
{
/*
* prescaler to time tick
* Ttick_unit = (PRE_8+1) * Tapb2_clk
* PRE_8 = (Ttick_unit/Tapb2_clk) -1
*/
NPCX_ITPRE(ITIM32) = (clock_get_apb2_freq() / SECOND) - 1;
/* Set event tick unit = 1/32768 sec */
NPCX_ITPRE(ITIM_EVENT_NO) = 0;
}
/**
* Preset SPI operation clock.
*
* @param none
* @return none
* @notes changed when initial or HOOK_FREQ_CHANGE command
*/
void spi_freq_changed(void)
{
uint8_t prescaler_divider = 0;
/* Set clock prescaler divider to SPI module*/
prescaler_divider = (uint8_t)((uint32_t)clock_get_apb2_freq()
/ 2 / SPI_CLK);
if (prescaler_divider >= 1)
prescaler_divider = prescaler_divider - 1;
if (prescaler_divider > 0x7F)
prescaler_divider = 0x7F;
/* Set core clock division factor in order to obtain the SPI clock */
NPCX_SPI_CTL1 = (NPCX_SPI_CTL1&(~(((1<<7)-1)<<NPCX_SPI_CTL1_SCDV)))
|(prescaler_divider<<NPCX_SPI_CTL1_SCDV);
}
/**
* Set PWM operation clock.
*
* @param ch operation channel
* @param freq desired PWM frequency
* @param res resolution for duty cycle
* @notes changed when initialization
*/
void pwm_set_freq(enum pwm_channel ch, uint32_t freq, uint32_t res)
{
int mdl = pwm_channels[ch].channel;
uint32_t prescaler_divider = 0;
uint32_t clock;
/* Disable PWM for module configuration */
pwm_enable(ch, 0);
/* Get PWM clock frequency */
if (pwm_channels[ch].flags & PWM_CONFIG_DSLEEP_CLK)
clock = INT_32K_CLOCK;
else
clock = clock_get_apb2_freq();
/*
* Using PWM Frequency and Resolution we calculate
* prescaler for input clock
*/
prescaler_divider = ((clock / freq)/res);
/* Set clock prescaler divider to PWM module*/
if (prescaler_divider >= 1)
prescaler_divider = prescaler_divider - 1;
if (prescaler_divider > 0xFFFF)
prescaler_divider = 0xFFFF;
/* Configure computed prescaler and resolution */
NPCX_PRSC(mdl) = (uint16_t)prescaler_divider - 1;
/* Set PWM cycle time */
NPCX_CTR(mdl) = res - 1;
/* Set the duty cycle to 0% since DCR > CTR */
NPCX_DCR(mdl) = res;
}
