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libboard_zynq::clocks: setup clock sources and cpu clock

This commit is contained in:
Astro 2020-01-23 22:44:10 +01:00
parent 77f440db33
commit aae85981e2
8 changed files with 296 additions and 195 deletions
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16
experiments/src/main.rs
View File

@ -3,7 +3,7 @@
use core::mem::transmute;
use libcortex_a9::mutex::Mutex;
use libboard_zynq::{print, println, self as zynq};
use libboard_zynq::{print, println, self as zynq, clocks::Clocks, clocks::source::{ClockSource, ArmPll, IoPll}};
use libboard_zc706::{
ram, alloc::{vec, vec::Vec},
boot,
@ -27,6 +27,20 @@ pub fn main_core0() {
println!("Boot mode: {:?}", zynq::slcr::RegisterBlock::new().boot_mode.read().boot_mode_pins());
}
#[cfg(feature = "target_zc706")]
const CPU_FREQ: u32 = 800_000_000;
#[cfg(feature = "target_cora_z7_10")]
const CPU_FREQ: u32 = 650_000_000;
println!("Setup clock sources...");
ArmPll::setup(2 * CPU_FREQ);
Clocks::set_cpu_freq(CPU_FREQ);
IoPll::setup(700_000_000);
libboard_zynq::stdio::drop_uart();
println!("PLLs set up");
let clocks = zynq::clocks::Clocks::get();
println!("CPU Clocks: {}/{}/{}/{}", clocks.cpu_6x4x(), clocks.cpu_3x2x(), clocks.cpu_2x(), clocks.cpu_1x());
let mut flash = zynq::flash::Flash::new(200_000_000).linear_addressing_mode();
let flash_ram: &[u8] = unsafe { core::slice::from_raw_parts(flash.ptr(), flash.size()) };
for i in 0..=1 {

175
libboard_zynq/src/clocks.rs
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@ -1,175 +0,0 @@
use libregister::{RegisterR, RegisterW, RegisterRW};
use super::slcr;
#[cfg(feature = "target_zc706")]
const PS_CLK: u32 = 33_333_333;
#[cfg(feature = "target_cora_z7_10")]
const PS_CLK: u32 = 50_000_000;
enum CpuClockMode {
/// Clocks run in 4:2:2:1 mode
C421,
/// Clocks run in 6:3:2:1 mode
C621,
}
impl CpuClockMode {
pub fn get() -> Self {
let regs = slcr::RegisterBlock::new();
if regs.clk_621_true.read().clk_621_true() {
CpuClockMode::C621
} else {
CpuClockMode::C421
}
}
}
#[derive(Debug, Clone)]
pub struct CpuClocks {
/// ARM PLL: Recommended clock source for the CPUs and the interconnect
pub arm: u32,
/// DDR PLL: Recommended clock for the DDR DRAM controller and AXI_HP interfaces
pub ddr: u32,
/// I/O PLL: Recommended clock for I/O peripherals
pub io: u32,
}
impl CpuClocks {
pub fn get() -> Self {
let regs = slcr::RegisterBlock::new();
let arm = u32::from(regs.arm_pll_ctrl.read().pll_fdiv()) * PS_CLK;
let ddr = u32::from(regs.ddr_pll_ctrl.read().pll_fdiv()) * PS_CLK;
let io = u32::from(regs.io_pll_ctrl.read().pll_fdiv()) * PS_CLK;
CpuClocks { arm, ddr, io }
}
pub fn cpu_6x4x(&self) -> u32 {
let regs = slcr::RegisterBlock::new();
let arm_clk_ctrl = regs.arm_clk_ctrl.read();
let pll = match arm_clk_ctrl.srcsel() {
slcr::ArmPllSource::ArmPll => self.arm,
slcr::ArmPllSource::DdrPll => self.ddr,
slcr::ArmPllSource::IoPll => self.io,
};
pll / u32::from(arm_clk_ctrl.divisor())
}
pub fn cpu_3x2x(&self) -> u32 {
self.cpu_6x4x() / 2
}
pub fn cpu_2x(&self) -> u32 {
match CpuClockMode::get() {
CpuClockMode::C421 =>
self.cpu_6x4x() / 2,
CpuClockMode::C621 =>
self.cpu_6x4x() / 3,
}
}
pub fn cpu_1x(&self) -> u32 {
match CpuClockMode::get() {
CpuClockMode::C421 =>
self.cpu_6x4x() / 4,
CpuClockMode::C621 =>
self.cpu_6x4x() / 6,
}
}
pub fn uart_ref_clk(&self) -> u32 {
let regs = slcr::RegisterBlock::new();
let uart_clk_ctrl = regs.uart_clk_ctrl.read();
let pll = match uart_clk_ctrl.srcsel() {
slcr::PllSource::ArmPll =>
self.arm,
slcr::PllSource::DdrPll =>
self.ddr,
slcr::PllSource::IoPll =>
self.io,
};
pll / u32::from(uart_clk_ctrl.divisor())
}
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 25.10.4 PLLs
pub fn enable_io(target_clock: u32) {
let fdiv = (target_clock / PS_CLK).min(66) as u16;
slcr::RegisterBlock::unlocked(|slcr| {
slcr.io_pll_ctrl.modify(|_, w| w
.pll_pwrdwn(false)
.pll_bypass_force(true)
.pll_fdiv(fdiv)
);
slcr.io_pll_ctrl.modify(|_, w| w
.pll_reset(true)
);
slcr.io_pll_ctrl.modify(|_, w| w
.pll_reset(false)
);
while ! slcr.pll_status.read().io_pll_lock() {}
slcr.io_pll_ctrl.modify(|_, w| w
.pll_bypass_force(false)
.pll_bypass_qual(false)
);
});
}
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 25.10.4 PLLs
pub fn enable_ddr(target_clock: u32) {
let fdiv = (target_clock / PS_CLK).min(66) as u16;
let (pll_res, pll_cp, lock_cnt) = PLL_FDIV_LOCK_PARAM.iter()
.filter(|(fdiv_max, _)| fdiv <= *fdiv_max)
.nth(0)
.expect("PLL_FDIV_LOCK_PARAM")
.1.clone();
slcr::RegisterBlock::unlocked(|regs| {
regs.ddr_pll_ctrl.modify(|_, w| w
.pll_pwrdwn(false)
.pll_bypass_force(true)
.pll_fdiv(fdiv)
);
regs.ddr_pll_cfg.write(
slcr::PllCfg::zeroed()
.pll_res(pll_res)
.pll_cp(pll_cp)
.lock_cnt(lock_cnt)
);
regs.ddr_pll_ctrl.modify(|_, w| w
.pll_reset(true)
);
regs.ddr_pll_ctrl.modify(|_, w| w
.pll_reset(false)
);
while ! regs.pll_status.read().ddr_pll_lock() {}
regs.ddr_pll_ctrl.modify(|_, w| w
.pll_bypass_force(false)
.pll_bypass_qual(false)
);
});
}
}
/// (pll_fdiv_max, (pll_cp, pll_res, lock_cnt))
const PLL_FDIV_LOCK_PARAM: &[(u16, (u8, u8, u16))] = &[
(13, (2, 6, 750)),
(14, (2, 6, 700)),
(15, (2, 6, 650)),
(16, (2, 10, 625)),
(17, (2, 10, 575)),
(18, (2, 10, 550)),
(19, (2, 10, 525)),
(20, (2, 12, 500)),
(21, (2, 12, 475)),
(22, (2, 12, 450)),
(23, (2, 12, 425)),
(25, (2, 12, 400)),
(26, (2, 12, 375)),
(28, (2, 12, 350)),
(30, (2, 12, 325)),
(33, (2, 2, 300)),
(36, (2, 2, 275)),
(40, (2, 2, 250)),
(47, (3, 12, 250)),
(66, (2, 4, 250)),
];

107
libboard_zynq/src/clocks/mod.rs Normal file
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@ -0,0 +1,107 @@
use libregister::{RegisterR, RegisterW, RegisterRW};
use super::slcr;
pub use slcr::ArmPllSource;
pub mod source;
use source::*;
enum CpuClockMode {
/// Clocks run in 4:2:2:1 mode
C421,
/// Clocks run in 6:3:2:1 mode
C621,
}
impl CpuClockMode {
pub fn get() -> Self {
let regs = slcr::RegisterBlock::new();
if regs.clk_621_true.read().clk_621_true() {
CpuClockMode::C621
} else {
CpuClockMode::C421
}
}
}
#[derive(Debug, Clone)]
pub struct Clocks {
/// ARM PLL: Recommended clock source for the CPUs and the interconnect
pub arm: u32,
/// DDR PLL: Recommended clock for the DDR DRAM controller and AXI_HP interfaces
pub ddr: u32,
/// I/O PLL: Recommended clock for I/O peripherals
pub io: u32,
}
impl Clocks {
pub fn get() -> Self {
Clocks {
arm: ArmPll::freq(),
ddr: DdrPll::freq(),
io: IoPll::freq(),
}
}
pub fn set_cpu_freq(target_freq: u32) {
let arm_pll = ArmPll::freq();
// 1 and 3 cannot be used
let mut div = 2u8;
while div == 3 || (div < 63 && arm_pll / u32::from(div) > target_freq) {
div += 1;
}
slcr::RegisterBlock::unlocked(|slcr| {
slcr.arm_clk_ctrl.modify(|_, w| w
.srcsel(ArmPllSource::ArmPll)
.divisor(div)
);
})
}
pub fn cpu_6x4x(&self) -> u32 {
let slcr = slcr::RegisterBlock::new();
let arm_clk_ctrl = slcr.arm_clk_ctrl.read();
let pll = match arm_clk_ctrl.srcsel() {
ArmPllSource::ArmPll => self.arm,
ArmPllSource::DdrPll => self.ddr,
ArmPllSource::IoPll => self.io,
};
pll / u32::from(arm_clk_ctrl.divisor())
}
pub fn cpu_3x2x(&self) -> u32 {
self.cpu_6x4x() / 2
}
pub fn cpu_2x(&self) -> u32 {
match CpuClockMode::get() {
CpuClockMode::C421 =>
self.cpu_6x4x() / 2,
CpuClockMode::C621 =>
self.cpu_6x4x() / 3,
}
}
pub fn cpu_1x(&self) -> u32 {
match CpuClockMode::get() {
CpuClockMode::C421 =>
self.cpu_6x4x() / 4,
CpuClockMode::C621 =>
self.cpu_6x4x() / 6,
}
}
pub fn uart_ref_clk(&self) -> u32 {
let regs = slcr::RegisterBlock::new();
let uart_clk_ctrl = regs.uart_clk_ctrl.read();
let pll = match uart_clk_ctrl.srcsel() {
slcr::PllSource::ArmPll =>
self.arm,
slcr::PllSource::DdrPll =>
self.ddr,
slcr::PllSource::IoPll =>
self.io,
};
pll / u32::from(uart_clk_ctrl.divisor())
}
}

156
libboard_zynq/src/clocks/source.rs Normal file
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@ -0,0 +1,156 @@
use libregister::{RegisterR, RegisterW, RegisterRW};
use super::slcr;
#[cfg(feature = "target_zc706")]
pub const PS_CLK: u32 = 33_333_333;
#[cfg(feature = "target_cora_z7_10")]
pub const PS_CLK: u32 = 50_000_000;
/// (pll_fdiv_max, (pll_cp, pll_res, lock_cnt))
const PLL_FDIV_LOCK_PARAM: &[(u16, (u8, u8, u16))] = &[
(13, (2, 6, 750)),
(14, (2, 6, 700)),
(15, (2, 6, 650)),
(16, (2, 10, 625)),
(17, (2, 10, 575)),
(18, (2, 10, 550)),
(19, (2, 10, 525)),
(20, (2, 12, 500)),
(21, (2, 12, 475)),
(22, (2, 12, 450)),
(23, (2, 12, 425)),
(25, (2, 12, 400)),
(26, (2, 12, 375)),
(28, (2, 12, 350)),
(30, (2, 12, 325)),
(33, (2, 2, 300)),
(36, (2, 2, 275)),
(40, (2, 2, 250)),
(47, (3, 12, 250)),
(66, (2, 4, 250)),
];
pub trait ClockSource {
/// picks this ClockSource's registers from the SLCR block
fn pll_regs(slcr: &mut crate::slcr::RegisterBlock)
-> (&mut crate::slcr::PllCtrl,
&mut crate::slcr::PllCfg,
&mut crate::slcr::PllStatus
);
/// query PLL lock status
fn pll_locked(pll_status: &mut crate::slcr::PllStatus) -> bool;
/// get configured frequency
fn freq() -> u32 {
let mut slcr = slcr::RegisterBlock::new();
let (pll_ctrl, _, _) = Self::pll_regs(&mut slcr);
u32::from(pll_ctrl.read().pll_fdiv()) * PS_CLK
}
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 25.10.4 PLLs
fn setup(target_freq: u32) {
let fdiv = (target_freq / PS_CLK).min(66) as u16;
let (pll_res, pll_cp, lock_cnt) = PLL_FDIV_LOCK_PARAM.iter()
.filter(|(fdiv_max, _)| fdiv <= *fdiv_max)
.nth(0)
.expect("PLL_FDIV_LOCK_PARAM")
.1.clone();
slcr::RegisterBlock::unlocked(|slcr| {
let (pll_ctrl, pll_cfg, pll_status) = Self::pll_regs(slcr);
// Bypass
pll_ctrl.modify(|_, w| w
.pll_pwrdwn(false)
.pll_bypass_force(true)
.pll_fdiv(fdiv)
);
// Configure
pll_cfg.write(
slcr::PllCfg::zeroed()
.pll_res(pll_res)
.pll_cp(pll_cp)
.lock_cnt(lock_cnt)
);
// Reset
pll_ctrl.modify(|_, w| w.pll_reset(true));
pll_ctrl.modify(|_, w| w.pll_reset(false));
// Wait for PLL lock
while ! Self::pll_locked(pll_status) {}
// Remove bypass
pll_ctrl.modify(|_, w| w
.pll_bypass_force(false)
.pll_bypass_qual(false)
);
});
}
}
/// ARM PLL: Recommended clock source for the CPUs and the interconnect
pub struct ArmPll;
impl ClockSource for ArmPll {
#[inline]
fn pll_regs(slcr: &mut crate::slcr::RegisterBlock)
-> (&mut crate::slcr::PllCtrl,
&mut crate::slcr::PllCfg,
&mut crate::slcr::PllStatus
) {
(&mut slcr.arm_pll_ctrl,
&mut slcr.arm_pll_cfg,
&mut slcr.pll_status
)
}
#[inline]
fn pll_locked(pll_status: &mut crate::slcr::PllStatus) -> bool {
pll_status.read().arm_pll_lock()
}
}
/// DDR PLL: Recommended clock for the DDR DRAM controller and AXI_HP interfaces
pub struct DdrPll;
impl ClockSource for DdrPll {
#[inline]
fn pll_regs(slcr: &mut crate::slcr::RegisterBlock)
-> (&mut crate::slcr::PllCtrl,
&mut crate::slcr::PllCfg,
&mut crate::slcr::PllStatus
) {
(&mut slcr.ddr_pll_ctrl,
&mut slcr.ddr_pll_cfg,
&mut slcr.pll_status
)
}
#[inline]
fn pll_locked(pll_status: &mut crate::slcr::PllStatus) -> bool {
pll_status.read().ddr_pll_lock()
}
}
/// I/O PLL: Recommended clock for I/O peripherals
pub struct IoPll;
impl ClockSource for IoPll {
#[inline]
fn pll_regs(slcr: &mut crate::slcr::RegisterBlock)
-> (&mut crate::slcr::PllCtrl,
&mut crate::slcr::PllCfg,
&mut crate::slcr::PllStatus
) {
(&mut slcr.io_pll_ctrl,
&mut slcr.io_pll_cfg,
&mut slcr.pll_status
)
}
#[inline]
fn pll_locked(pll_status: &mut crate::slcr::PllStatus) -> bool {
pll_status.read().io_pll_lock()
}
}

20
libboard_zynq/src/ddr/mod.rs
View File

@ -1,7 +1,7 @@
use libregister::{RegisterR, RegisterW, RegisterRW};
use crate::{print, println};
use super::slcr;
use super::clocks::CpuClocks;
use super::clocks::{Clocks, source::{DdrPll, ClockSource}};
mod regs;
@ -11,7 +11,7 @@ const DDR_FREQ: u32 = 666_666_666;
#[cfg(feature = "target_cora_z7_10")]
/// Micron MT41K256M16HA-125: 800 MHz DDR3L, max supported 533 MHz
const DDR_FREQ: u32 = 533_333_333;
const DDR_FREQ: u32 = 525_000_000;
/// MT41K256M16HA-125
const DCI_FREQ: u32 = 10_000_000;
@ -34,16 +34,14 @@ impl DdrRam {
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 10.6.1 DDR Clock Initialization
fn clock_setup() -> CpuClocks {
let clocks = CpuClocks::get();
if clocks.ddr == 0 {
CpuClocks::enable_ddr(clocks.arm);
}
let clocks = CpuClocks::get();
fn clock_setup() -> Clocks {
DdrPll::setup(2 * DDR_FREQ);
let clocks = Clocks::get();
println!("Clocks: {:?}", clocks);
let ddr3x_clk_divisor = ((DDR_FREQ - 1 + clocks.ddr) / DDR_FREQ).min(255) as u8;
let ddr2x_clk_divisor = 3 * ddr3x_clk_divisor / 2;
let ddr3x_clk_divisor = 2;
let ddr2x_clk_divisor = 3;
println!("DDR 3x/2x clocks: {}/{}", clocks.ddr / u32::from(ddr3x_clk_divisor), clocks.ddr / u32::from(ddr2x_clk_divisor));
slcr::RegisterBlock::unlocked(|slcr| {
@ -60,7 +58,7 @@ impl DdrRam {
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 10.6.2 DDR IOB Impedance Calibration
fn calibrate_iob_impedance(clocks: &CpuClocks) {
fn calibrate_iob_impedance(clocks: &Clocks) {
let divisor0 = ((DCI_FREQ - 1 + clocks.ddr) / DCI_FREQ)
.max(1).min(63) as u8;
let divisor1 = (clocks.ddr / DCI_FREQ / u32::from(divisor0))

8
libboard_zynq/src/eth/mod.rs
View File

@ -1,7 +1,7 @@
use libregister::*;
use crate::println;
use super::slcr;
use super::clocks::CpuClocks;
use super::clocks::Clocks;
pub mod phy;
use phy::{Phy, PhyAccess};
@ -194,7 +194,7 @@ impl<'r> Eth<'r, (), ()> {
impl<'r, RX, TX> Eth<'r, RX, TX> {
pub fn setup_gem0_clock(tx_clock: u32) {
let io_pll = CpuClocks::get().io;
let io_pll = Clocks::get().io;
let d0 = ((tx_clock - 1 + io_pll) / tx_clock).max(1).min(63);
let d1 = (io_pll / tx_clock / d0).max(1).min(63);
@ -218,7 +218,7 @@ impl<'r, RX, TX> Eth<'r, RX, TX> {
}
pub fn setup_gem1_clock(tx_clock: u32) {
let io_pll = CpuClocks::get().io;
let io_pll = Clocks::get().io;
let d0 = ((tx_clock - 1 + io_pll) / tx_clock).max(1).min(63);
let d1 = (io_pll / tx_clock / d0).max(1).min(63);
@ -452,7 +452,7 @@ impl<'r> EthInner<'r> {
}
fn configure(&mut self, macaddr: [u8; 6]) {
let clocks = CpuClocks::get();
let clocks = Clocks::get();
let mdc_clk_div = (clocks.cpu_1x() / MAX_MDC) + 1;
self.regs.net_cfg.write(

5
libboard_zynq/src/flash/mod.rs
View File

@ -4,7 +4,7 @@ use crate::{print, println};
use core::marker::PhantomData;
use libregister::{RegisterR, RegisterW, RegisterRW};
use super::slcr;
use super::clocks::CpuClocks;
use super::clocks::source::{IoPll, ClockSource};
mod regs;
mod bytes;
@ -137,8 +137,9 @@ impl Flash<()> {
flash
}
/// typical: `200_000_000` Hz
fn enable_clocks(clock: u32) {
let io_pll = CpuClocks::get().io;
let io_pll = IoPll::freq();
let divisor = ((clock - 1 + io_pll) / clock)
.max(1).min(63) as u8;

4
libboard_zynq/src/uart/mod.rs
View File

@ -2,7 +2,7 @@ use core::fmt;
use libregister::*;
use super::slcr;
use super::clocks::CpuClocks;
use super::clocks::Clocks;
mod regs;
mod baud_rate_gen;
@ -110,7 +110,7 @@ impl Uart {
self.disable_rx();
self.disable_tx();
let clocks = CpuClocks::get();
let clocks = Clocks::get();
baud_rate_gen::configure(self.regs, clocks.uart_ref_clk(), baudrate);
// Enable controller