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zynq-rs
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zynq::ddr: fix clock setup

This commit is contained in:
Astro 2019-10-28 00:43:09 +01:00
parent f199ac68b4
commit fc39885d3b
2 changed files with 10 additions and 18 deletions
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10
src/main.rs
View File

@ -87,16 +87,6 @@ const HWADDR: [u8; 6] = [0, 0x23, 0xde, 0xea, 0xbe, 0xef];
fn main() {
println!("Main.");
zynq::clocks::CpuClocks::enable_ddr(1_066_666_666);
let pll_status = zynq::slcr::RegisterBlock::new().pll_status.read();
println!("PLLs: {}", pll_status);
let clocks = zynq::clocks::CpuClocks::get();
println!("Clocks: {:?}", clocks);
println!("CPU speeds: {}/{}/{}/{} MHz",
clocks.cpu_6x4x() / 1_000_000,
clocks.cpu_3x2x() / 1_000_000,
clocks.cpu_2x() / 1_000_000,
clocks.cpu_1x() / 1_000_000);
let mut ddr = zynq::ddr::DdrRam::new();
println!("DDR: {:?}", ddr.status());
ddr.memtest();

18
src/zynq/ddr/mod.rs
View File

@ -10,8 +10,8 @@ mod regs;
const DDR_FREQ: u32 = 666_666_666;
#[cfg(feature = "target_cora_z7_10")]
/// Micron MT41K256M16HA-125: 800 MHz DDR3L
const DDR_FREQ: u32 = 800_000_000;
/// Micron MT41K256M16HA-125: 800 MHz DDR3L, max supported 533 MHz
const DDR_FREQ: u32 = 533_333_333;
/// MT41K256M16HA-125
const DCI_FREQ: u32 = 10_000_000;
@ -22,8 +22,7 @@ pub struct DdrRam {
impl DdrRam {
pub fn new() -> Self {
let clocks = CpuClocks::get();
Self::clock_setup(&clocks);
let clocks = Self::clock_setup();
Self::calibrate_iob_impedance(&clocks);
Self::configure_iob();
@ -35,8 +34,10 @@ impl DdrRam {
/// Zynq-7000 AP SoC Technical Reference Manual:
/// 10.6.1 DDR Clock Initialization
fn clock_setup(clocks: &CpuClocks) {
CpuClocks::enable_ddr(1_066_666_666);
fn clock_setup() -> CpuClocks {
let clocks = CpuClocks::get();
CpuClocks::enable_ddr(clocks.cpu);
let clocks = CpuClocks::get();
let ddr3x_clk_divisor = ((clocks.ddr - 1) / DDR_FREQ + 1).min(255) as u8;
let ddr2x_clk_divisor = 3 * ddr3x_clk_divisor / 2;
@ -50,6 +51,7 @@ impl DdrRam {
.ddr_3xclk_divisor(ddr3x_clk_divisor)
);
});
clocks
}
/// Zynq-7000 AP SoC Technical Reference Manual:
@ -57,7 +59,7 @@ impl DdrRam {
fn calibrate_iob_impedance(clocks: &CpuClocks) {
let divisor0 = (clocks.ddr / DCI_FREQ)
.max(1).min(63) as u8;
let divisor1 = (clocks.ddr / DCI_FREQ / u32::from(divisor0))
let divisor1 = 1 + (clocks.ddr / DCI_FREQ / u32::from(divisor0))
.max(1).min(63) as u8;
slcr::RegisterBlock::unlocked(|slcr| {
@ -76,7 +78,7 @@ impl DdrRam {
slcr.ddriob_dci_ctrl.modify(|_, w|
w.reset(true)
);
// Step 3.b. for DDR3
// Step 3.b. for DDR3/DDR3L
slcr.ddriob_dci_ctrl.modify(|_, w|
w.nref_opt1(0)
.nref_opt2(0)