/* initialize rtc setting of using dcxo clock */
static int rtc_enable_dcxo(void)
{
u16 bbpu, con, osc32con, sec;
rtc_read(RTC_BBPU, &bbpu);
rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD);
rtc_write_trigger();
mdelay(1);
if (!rtc_writeif_unlock()) { /* Unlock for reload */
rtc_info("rtc_writeif_unlock() fail\n");
return 0;
}
rtc_read(RTC_OSC32CON, &osc32con);
osc32con &= ~RTC_EMBCK_SRC_SEL;
osc32con |= RTC_XOSC32_ENB | RTC_REG_XOSC32_ENB;
if (!rtc_xosc_write(osc32con)) {
rtc_info("rtc_xosc_write() fail\n");
return 0;
}
rtc_read(RTC_BBPU, &bbpu);
rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD);
rtc_write_trigger();
rtc_read(RTC_CON, &con);
rtc_read(RTC_OSC32CON, &osc32con);
rtc_read(RTC_AL_SEC, &sec);
rtc_info("con=0x%x, osc32con=0x%x, sec=0x%x\n", con, osc32con, sec);
return 1;
}
void rtc_gpio_disable_32k(rtc_gpio_user_t user)
{
u16 con, pdn1;
unsigned long flags;
if (user < RTC_GPIO_USER_WIFI || user > RTC_GPIO_USER_FM)
return;
spin_lock_irqsave(&rtc_lock, flags);
pdn1 = rtc_read(RTC_PDN1) & ~(1U << user);
rtc_write(RTC_PDN1, pdn1);
rtc_write_trigger();
if (!(pdn1 & RTC_GPIO_USER_MASK)) { /* no users */
if (get_chip_eco_ver() == CHIP_E1) {
/* keep exporting 32K to avoid f32k_ck drift */
} else {
con = rtc_read(RTC_CON) | RTC_CON_F32KOB;
rtc_write(RTC_CON, con);
rtc_write_trigger();
con = rtc_read(RTC_OSC32CON) & ~RTC_OSC32CON_GPIOCKEN;
rtc_xosc_write(con, true);
}
}
spin_unlock_irqrestore(&rtc_lock, flags);
printk(RTC_SAY "RTC_GPIO user %d disables 32k (0x%x)\n", user, pdn1);
}
void rtc_gpio_enable_32k(rtc_gpio_user_t user)
{
u16 con, pdn1;
unsigned long flags;
if (user < RTC_GPIO_USER_WIFI || user > RTC_GPIO_USER_FM)
return;
spin_lock_irqsave(&rtc_lock, flags);
pdn1 = rtc_read(RTC_PDN1);
if (!(pdn1 & RTC_GPIO_USER_MASK)) { /* first user */
con = rtc_read(RTC_OSC32CON) | RTC_OSC32CON_GPIOCKEN;
rtc_xosc_write(con, true);
con = rtc_read(RTC_CON) & ~RTC_CON_F32KOB;
rtc_write(RTC_CON, con);
rtc_write_trigger();
}
pdn1 |= (1U << user);
rtc_write(RTC_PDN1, pdn1);
rtc_write_trigger();
spin_unlock_irqrestore(&rtc_lock, flags);
printk(RTC_SAY "RTC_GPIO user %d enables 32k (0x%x)\n", user, pdn1);
}
void rtc_bbpu_power_down(void)
{
u16 bbpu, con;
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
rtc_writeif_unlock();
/* disable 32K export if there are no RTC_GPIO users */
if (!(rtc_read(RTC_PDN1) & RTC_GPIO_USER_MASK)) {
con = rtc_read(RTC_CON) | RTC_CON_F32KOB;
rtc_write(RTC_CON, con);
rtc_write_trigger();
con = rtc_read(RTC_OSC32CON) & ~RTC_OSC32CON_GPIOCKEN;
rtc_xosc_write(con, false);
}
/* pull PWRBB low */
bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_PWREN;
rtc_write(RTC_BBPU, bbpu);
rtc_write_trigger();
spin_unlock_irqrestore(&rtc_lock, flags);
}