WRPLL firmware
satman main & si549: add WRPLL select_recovered_clock satman main & si549: add helper si549 setup si549: add tag collector to process gtx & main tags si549: add frequency counter to set BASE_ADPLL si549: add set_adpll for main & helper PLL si549: add main & helper PLL FIQ & si549: add handler for gtx & main tags FIQ
This commit is contained in:
parent
f1a4a2f97f
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@ -268,3 +268,282 @@ pub fn main_setup(timer: &mut GlobalTimer, settings: FrequencySetting) -> Result
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info!("Main Si549 started");
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Ok(())
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}
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#[cfg(has_wrpll)]
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pub mod wrpll {
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use libcortex_a9::mutex::Mutex;
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use super::*;
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const TIMER_WIDTH: u32 = 24;
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const COUNTER_DIV: u32 = 2;
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const ADPLL_MAX: i32 = (950.0 / 0.0001164) as i32;
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const KP: i32 = 6;
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const KI: i32 = 2;
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static BASE_ADPLL: Mutex<i32> = Mutex::new(0);
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static H_INTEGRATOR: Mutex<i32> = Mutex::new(0);
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static M_INTEGRATOR: Mutex<i32> = Mutex::new(0);
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#[derive(Clone, Copy)]
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pub enum FIQ {
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RefTag,
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MainTag,
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}
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mod tag_collector {
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use super::*;
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const BEATING_PERIOD: i32 = 0x8000;
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const BEATING_HALFPERIOD: i32 = 0x4000;
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static REF_TAG: Mutex<u32> = Mutex::new(0);
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static REF_TAG_READY: Mutex<bool> = Mutex::new(false);
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static MAIN_TAG: Mutex<u32> = Mutex::new(0);
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static MAIN_TAG_READY: Mutex<bool> = Mutex::new(false);
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pub fn reset() {
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clear_phase_diff_ready();
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*REF_TAG.lock() = 0;
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*MAIN_TAG.lock() = 0;
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}
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pub fn clear_phase_diff_ready() {
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*REF_TAG_READY.lock() = false;
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*MAIN_TAG_READY.lock() = false;
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}
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pub fn collect_tags(interrupt: FIQ) {
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match interrupt {
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FIQ::RefTag => {
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*REF_TAG.lock() = unsafe { csr::wrpll::ref_tag_read() };
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*REF_TAG_READY.lock() = true;
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}
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FIQ::MainTag => {
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*MAIN_TAG.lock() = unsafe { csr::wrpll::main_tag_read() };
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*MAIN_TAG_READY.lock() = true;
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}
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}
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}
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pub fn phase_diff_ready() -> bool {
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*REF_TAG_READY.lock() && *MAIN_TAG_READY.lock()
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}
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pub fn get_period_error() -> i32 {
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// n * BEATING_PERIOD - REF_TAG(n) mod BEATING_PERIOD
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let mut period_error = (*REF_TAG.lock()).overflowing_neg().0.rem_euclid(BEATING_PERIOD as u32) as i32;
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// mapping tags from [0, 2π] -> [-π, π]
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if period_error > BEATING_HALFPERIOD {
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period_error -= BEATING_PERIOD
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}
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period_error
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}
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pub fn get_phase_error() -> i32 {
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// MAIN_TAG(n) - REF_TAG(n) mod BEATING_PERIOD
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let mut phase_error = (*MAIN_TAG.lock())
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.overflowing_sub(*REF_TAG.lock())
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.0
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.rem_euclid(BEATING_PERIOD as u32) as i32;
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// mapping tags from [0, 2π] -> [-π, π]
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if phase_error > BEATING_HALFPERIOD {
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phase_error -= BEATING_PERIOD
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}
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phase_error
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}
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}
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pub fn helper_setup(timer: &mut GlobalTimer, settings: FrequencySetting) -> Result<(), &'static str> {
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unsafe {
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csr::wrpll::helper_reset_write(1);
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csr::helper_dcxo::bitbang_enable_write(1);
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csr::helper_dcxo::i2c_address_write(ADDRESS);
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}
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setup(i2c::DCXO::Helper, settings.helper, timer)?;
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// Si549 maximum settling time for large frequency change.
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timer.delay_us(40_000);
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unsafe {
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csr::wrpll::helper_reset_write(0);
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csr::helper_dcxo::bitbang_enable_write(0);
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}
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info!("Helper Si549 started");
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Ok(())
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}
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fn set_fiq(en: bool) {
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let val = if en { 1 } else { 0 };
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unsafe {
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csr::wrpll::ref_tag_ev_enable_write(val);
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csr::wrpll::main_tag_ev_enable_write(val);
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}
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}
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/// set adpll using gateware i2c
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/// Note: disable main/helper i2c bitbang before using this function
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fn set_adpll(dcxo: i2c::DCXO, adpll: i32) -> Result<(), &'static str> {
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if adpll.abs() > ADPLL_MAX {
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return Err("adpll is too large");
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}
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match dcxo {
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i2c::DCXO::Main => unsafe {
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if csr::main_dcxo::bitbang_enable_read() == 1 {
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return Err("Main si549 bitbang mode is active when using gateware i2c");
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}
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while csr::main_dcxo::adpll_busy_read() == 1 {}
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csr::main_dcxo::i2c_address_write(ADDRESS);
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csr::main_dcxo::adpll_write(adpll as u32);
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csr::main_dcxo::adpll_stb_write(1);
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csr::main_dcxo::adpll_stb_write(0);
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if csr::main_dcxo::nack_read() == 1 {
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return Err("Main si549 failed to ack adpll write");
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}
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},
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i2c::DCXO::Helper => unsafe {
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if csr::helper_dcxo::bitbang_enable_read() == 1 {
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return Err("Helper si549 bitbang mode is active when using gateware i2c");
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}
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while csr::helper_dcxo::adpll_busy_read() == 1 {}
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csr::helper_dcxo::i2c_address_write(ADDRESS);
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csr::helper_dcxo::adpll_write(adpll as u32);
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csr::helper_dcxo::adpll_stb_write(1);
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csr::helper_dcxo::adpll_stb_write(0);
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if csr::helper_dcxo::nack_read() == 1 {
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return Err("Helper si549 failed to ack adpll write");
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}
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},
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};
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Ok(())
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}
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/// To get within capture range
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fn set_base_adpll(timer: &mut GlobalTimer) -> Result<(), &'static str> {
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let count2adpll =
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|error: i32| (((error) as f64 * 1e6) / (0.0001164 * (1 << (TIMER_WIDTH - COUNTER_DIV)) as f64)) as i32;
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let (ref_count, main_count) = get_freq_counts(timer);
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let mut base_adpll_lock = BASE_ADPLL.lock();
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*base_adpll_lock = count2adpll(ref_count as i32 - main_count as i32);
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set_adpll(i2c::DCXO::Main, *base_adpll_lock)?;
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set_adpll(i2c::DCXO::Helper, *base_adpll_lock)?;
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Ok(())
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}
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fn get_freq_counts(timer: &mut GlobalTimer) -> (u32, u32) {
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unsafe {
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csr::wrpll::frequency_counter_update_en_write(1);
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timer.delay_us(150_000); // 8ns << TIMER_WIDTH
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csr::wrpll::frequency_counter_update_en_write(0);
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let ref_count = csr::wrpll::frequency_counter_counter_gtx0_rtio_rx_read();
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let main_count = csr::wrpll::frequency_counter_counter_sys_read();
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(ref_count, main_count)
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}
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}
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fn reset_plls() -> Result<(), &'static str> {
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*H_INTEGRATOR.lock() = 0;
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*M_INTEGRATOR.lock() = 0;
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set_adpll(i2c::DCXO::Main, 0)?;
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set_adpll(i2c::DCXO::Helper, 0)?;
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Ok(())
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}
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fn clear_pending(interrupt: FIQ) {
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match interrupt {
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FIQ::RefTag => unsafe { csr::wrpll::ref_tag_ev_pending_write(1) },
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FIQ::MainTag => unsafe { csr::wrpll::main_tag_ev_pending_write(1) },
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};
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}
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fn is_pending(interrupt: FIQ) -> bool {
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match interrupt {
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FIQ::RefTag => unsafe { csr::wrpll::ref_tag_ev_pending_read() == 1 },
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FIQ::MainTag => unsafe { csr::wrpll::main_tag_ev_pending_read() == 1 },
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}
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}
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pub fn interrupt_handler() {
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if is_pending(FIQ::RefTag) {
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tag_collector::collect_tags(FIQ::RefTag);
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clear_pending(FIQ::RefTag);
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helper_pll().expect("failed to run helper DCXO PLL");
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}
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if is_pending(FIQ::MainTag) {
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tag_collector::collect_tags(FIQ::MainTag);
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clear_pending(FIQ::MainTag);
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}
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if tag_collector::phase_diff_ready() {
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main_pll().expect("failed to run main DCXO PLL");
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tag_collector::clear_phase_diff_ready();
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}
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}
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fn helper_pll() -> Result<(), &'static str> {
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let period_err = tag_collector::get_period_error();
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let mut integrator_lock = H_INTEGRATOR.lock();
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*integrator_lock += period_err * KI;
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let mut h_adpll = *BASE_ADPLL.lock() + period_err * KP + *integrator_lock;
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h_adpll = h_adpll.clamp(-ADPLL_MAX, ADPLL_MAX);
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set_adpll(i2c::DCXO::Helper, h_adpll)?;
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Ok(())
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}
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fn main_pll() -> Result<(), &'static str> {
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let phase_err = tag_collector::get_phase_error();
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let mut integrator_lock = M_INTEGRATOR.lock();
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*integrator_lock += phase_err * KI;
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let mut m_adpll = *BASE_ADPLL.lock() + phase_err * KP + *integrator_lock;
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m_adpll = m_adpll.clamp(-ADPLL_MAX, ADPLL_MAX);
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set_adpll(i2c::DCXO::Main, m_adpll)?;
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Ok(())
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}
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pub fn select_recovered_clock(rc: bool, timer: &mut GlobalTimer) {
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set_fiq(false);
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if rc {
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tag_collector::reset();
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reset_plls().expect("failed to reset main and helper PLL");
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info!("warming up GTX CDR...");
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// gtx need a couple seconds for freq counter to read it properly
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timer.delay_us(20_000_000);
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set_base_adpll(timer).expect("failed to set base adpll");
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// clear gateware pending flag
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clear_pending(FIQ::RefTag);
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clear_pending(FIQ::MainTag);
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// use nFIQ to avoid IRQ being disabled by mutex lock and mess up PLL
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set_fiq(true);
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info!("WRPLL interrupt enabled");
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}
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}
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}
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@ -0,0 +1,21 @@
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#[cfg(has_wrpll)]
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use libboard_artiq::si549;
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use libboard_zynq::{println, stdio};
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use libcortex_a9::{interrupt_handler, regs::MPIDR};
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use libregister::RegisterR;
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interrupt_handler!(FIQ, fiq, __irq_stack0_start, __irq_stack1_start, {
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match MPIDR.read().cpu_id() {
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0 => {
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// nFIQ is driven directly and bypass GIC
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#[cfg(has_wrpll)]
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si549::wrpll::interrupt_handler();
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return;
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}
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_ => {}
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};
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stdio::drop_uart();
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println!("FIQ");
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loop {}
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});
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@ -21,6 +21,7 @@ pub use pl::csr::rtio_core;
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use void::Void;
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pub mod eh_artiq;
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pub mod fiq;
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pub mod i2c;
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pub mod irq;
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pub mod kernel;
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@ -825,6 +825,38 @@ const SI5324_SETTINGS: si5324::FrequencySettings = si5324::FrequencySettings {
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crystal_as_ckin2: true,
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};
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#[cfg(all(has_si549, rtio_frequency = "125.0"))]
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const SI549_SETTINGS: si549::FrequencySetting = si549::FrequencySetting {
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main: si549::DividerConfig {
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hsdiv: 0x058,
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lsdiv: 0,
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fbdiv: 0x04815791F25,
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},
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#[cfg(has_wrpll)]
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helper: si549::DividerConfig {
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// 125Mhz*32767/32768
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hsdiv: 0x058,
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lsdiv: 0,
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fbdiv: 0x04814E8F442,
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},
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};
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#[cfg(all(has_si549, rtio_frequency = "100.0"))]
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pub const SI549_SETTINGS: si549::FrequencySetting = si549::FrequencySetting {
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main: si549::DividerConfig {
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hsdiv: 0x06C,
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lsdiv: 0,
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fbdiv: 0x046C5F49797,
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},
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#[cfg(has_wrpll)]
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helper: si549::DividerConfig {
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// 100Mhz*32767/32768
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hsdiv: 0x06C,
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lsdiv: 0,
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fbdiv: 0x046C5670BBD,
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},
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};
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static mut LOG_BUFFER: [u8; 1 << 17] = [0; 1 << 17];
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#[no_mangle]
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@ -875,7 +907,7 @@ pub extern "C" fn main_core0() -> i32 {
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#[cfg(has_si5324)]
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si5324::setup(&mut i2c, &SI5324_SETTINGS, si5324::Input::Ckin1, &mut timer).expect("cannot initialize Si5324");
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#[cfg(has_si549)]
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si549::main_setup(&mut timer).expect("cannot initialize main Si549");
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si549::main_setup(&mut timer, SI549_SETTINGS).expect("cannot initialize main Si549");
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timer.delay_us(100_000);
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info!("Switching SYS clocks...");
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@ -893,6 +925,8 @@ pub extern "C" fn main_core0() -> i32 {
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unsafe {
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csr::gt_drtio::txenable_write(0xffffffffu32 as _);
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}
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#[cfg(has_wrpll)]
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si549::wrpll::helper_setup(&mut timer, SI549_SETTINGS).expect("cannot initialize helper Si549");
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#[cfg(has_drtio_routing)]
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let mut repeaters = [repeater::Repeater::default(); csr::DRTIOREP.len()];
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@ -938,6 +972,9 @@ pub extern "C" fn main_core0() -> i32 {
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si5324::siphaser::calibrate_skew(&mut timer).expect("failed to calibrate skew");
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}
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#[cfg(has_wrpll)]
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si549::wrpll::select_recovered_clock(true, &mut timer);
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// Various managers created here, so when link is dropped, all DMA traces
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// are cleared out for a clean slate on subsequent connections,
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// without a manual intervention.
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@ -1035,6 +1072,8 @@ pub extern "C" fn main_core0() -> i32 {
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info!("uplink is down, switching to local oscillator clock");
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#[cfg(has_siphaser)]
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si5324::siphaser::select_recovered_clock(&mut i2c, false, &mut timer).expect("failed to switch clocks");
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#[cfg(has_wrpll)]
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si549::wrpll::select_recovered_clock(false, &mut timer);
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}
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}
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