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eth: refactor peripheral instance into type parameter, improve clock setup

This commit is contained in:
Astro 2020-07-29 19:45:01 +02:00
parent ad47521e4b
commit de5f605d60
1 changed files with 153 additions and 101 deletions
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254
libboard_zynq/src/eth/mod.rs
View File

@ -1,4 +1,7 @@
use core::ops::{Deref, DerefMut};
use core::{
marker::PhantomData,
ops::{Deref, DerefMut},
};
use log::{error, info, warn};
use libregister::*;
use super::slcr;
@ -42,14 +45,109 @@ impl DerefMut for Buffer {
}
}
pub struct Eth<'r, RX, TX> {
/// Gigabit Ethernet Peripheral
pub trait Gem {
fn setup_clock(tx_clock: u32);
fn regs() -> &'static mut regs::RegisterBlock;
}
/// first Gigabit Ethernet peripheral
pub struct Gem0;
impl Gem for Gem0 {
fn setup_clock(tx_clock: u32) {
let (divisor0, divisor1) = calculate_tx_divisors(tx_clock);
slcr::RegisterBlock::unlocked(|slcr| {
slcr.gem0_clk_ctrl.write(
// 0x0050_0801: 8, 5: 100 Mb/s
// ...: 8, 1: 1000 Mb/s
slcr::GemClkCtrl::zeroed()
.clkact(true)
.srcsel(slcr::PllSource::IoPll)
.divisor(divisor0 as u8)
.divisor1(divisor1 as u8)
);
// Enable gem0 recv clock
slcr.gem0_rclk_ctrl.write(
// 0x0000_0801
slcr::RclkCtrl::zeroed()
.clkact(true)
);
});
}
fn regs() -> &'static mut regs::RegisterBlock {
regs::RegisterBlock::gem0()
}
}
/// second Gigabit Ethernet peripheal
pub struct Gem1;
impl Gem for Gem1 {
fn setup_clock(tx_clock: u32) {
let (divisor0, divisor1) = calculate_tx_divisors(tx_clock);
slcr::RegisterBlock::unlocked(|slcr| {
slcr.gem1_clk_ctrl.write(
slcr::GemClkCtrl::zeroed()
.clkact(true)
.srcsel(slcr::PllSource::IoPll)
.divisor(divisor0 as u8)
.divisor1(divisor1 as u8)
);
// Enable gem1 recv clock
slcr.gem1_rclk_ctrl.write(
// 0x0000_0801
slcr::RclkCtrl::zeroed()
.clkact(true)
);
});
}
fn regs() -> &'static mut regs::RegisterBlock {
regs::RegisterBlock::gem1()
}
}
fn calculate_tx_divisors(tx_clock: u32) -> (u8, u8) {
let io_pll = Clocks::get().io;
let target = (tx_clock - 1 + io_pll) / tx_clock;
let mut best = None;
let mut best_error = 0;
for divisor0 in 1..63 {
for divisor1 in 1..63 {
let current = (divisor0 as u32) * (divisor1 as u32);
let error = if current > target {
current - target
} else {
target - current
};
if best.is_none() || best_error > error {
best = Some((divisor0, divisor1));
best_error = error;
}
}
}
let result = best.unwrap();
info!("Eth TX clock for {}: {} / {} / {} = {}",
tx_clock, io_pll,
result.0, result.1,
io_pll / result.0 as u32 / result.1 as u32
);
result
}
pub struct Eth<GEM: Gem, RX, TX> {
rx: RX,
tx: TX,
inner: EthInner<'r>,
inner: EthInner<GEM>,
phy: Phy,
}
impl<'r> Eth<'r, (), ()> {
impl Eth<Gem0, (), ()> {
pub fn default(macaddr: [u8; 6]) -> Self {
slcr::RegisterBlock::unlocked(|slcr| {
// Manual example: 0x0000_1280
@ -182,22 +280,23 @@ impl<'r> Eth<'r, (), ()> {
}
pub fn gem0(macaddr: [u8; 6]) -> Self {
Self::setup_gem0_clock(TX_1000);
let regs = regs::RegisterBlock::gem0();
Self::from_regs(regs, macaddr)
Self::new(macaddr)
}
}
impl Eth<Gem1, (), ()> {
pub fn gem1(macaddr: [u8; 6]) -> Self {
Self::setup_gem1_clock(TX_1000);
let regs = regs::RegisterBlock::gem1();
Self::from_regs(regs, macaddr)
Self::new(macaddr)
}
}
impl<GEM: Gem> Eth<GEM, (), ()> {
fn new(macaddr: [u8; 6]) -> Self {
GEM::setup_clock(TX_1000);
fn from_regs(regs: &'r mut regs::RegisterBlock, macaddr: [u8; 6]) -> Self {
let mut inner = EthInner {
regs,
gem: PhantomData,
link: None,
};
inner.init();
@ -216,54 +315,8 @@ impl<'r> Eth<'r, (), ()> {
}
}
impl<'r, RX, TX> Eth<'r, RX, TX> {
pub fn setup_gem0_clock(tx_clock: u32) {
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);
slcr::RegisterBlock::unlocked(|slcr| {
slcr.gem0_clk_ctrl.write(
// 0x0050_0801: 8, 5: 100 Mb/s
// ...: 8, 1: 1000 Mb/s
slcr::GemClkCtrl::zeroed()
.clkact(true)
.srcsel(slcr::PllSource::IoPll)
.divisor(d0 as u8)
.divisor1(d1 as u8)
);
// Enable gem0 recv clock
slcr.gem0_rclk_ctrl.write(
// 0x0000_0801
slcr::RclkCtrl::zeroed()
.clkact(true)
);
});
}
pub fn setup_gem1_clock(tx_clock: u32) {
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);
slcr::RegisterBlock::unlocked(|slcr| {
slcr.gem1_clk_ctrl.write(
slcr::GemClkCtrl::zeroed()
.clkact(true)
.srcsel(slcr::PllSource::IoPll)
.divisor(d0 as u8)
.divisor1(d1 as u8)
);
// Enable gem1 recv clock
slcr.gem1_rclk_ctrl.write(
// 0x0000_0801
slcr::RclkCtrl::zeroed()
.clkact(true)
);
});
}
pub fn start_rx(self, rx_size: usize) -> Eth<'r, rx::DescList, TX> {
impl<GEM: Gem, RX, TX> Eth<GEM, RX, TX> {
pub fn start_rx(self, rx_size: usize) -> Eth<GEM, rx::DescList, TX> {
let new_self = Eth {
rx: rx::DescList::new(rx_size),
tx: self.tx,
@ -272,17 +325,17 @@ impl<'r, RX, TX> Eth<'r, RX, TX> {
};
let list_addr = new_self.rx.list_addr();
assert!(list_addr & 0b11 == 0);
new_self.inner.regs.rx_qbar.write(
GEM::regs().rx_qbar.write(
regs::RxQbar::zeroed()
.rx_q_baseaddr(list_addr >> 2)
);
new_self.inner.regs.net_ctrl.modify(|_, w|
GEM::regs().net_ctrl.modify(|_, w|
w.rx_en(true)
);
new_self
}
pub fn start_tx(self, tx_size: usize) -> Eth<'r, RX, tx::DescList> {
pub fn start_tx(self, tx_size: usize) -> Eth<GEM, RX, tx::DescList> {
let new_self = Eth {
rx: self.rx,
tx: tx::DescList::new(tx_size),
@ -291,23 +344,23 @@ impl<'r, RX, TX> Eth<'r, RX, TX> {
};
let list_addr = &new_self.tx.list_addr();
assert!(list_addr & 0b11 == 0);
new_self.inner.regs.tx_qbar.write(
GEM::regs().tx_qbar.write(
regs::TxQbar::zeroed()
.tx_q_baseaddr(list_addr >> 2)
);
new_self.inner.regs.net_ctrl.modify(|_, w|
GEM::regs().net_ctrl.modify(|_, w|
w.tx_en(true)
);
new_self
}
}
impl<'r, TX> Eth<'r, rx::DescList, TX> {
impl<GEM: Gem, TX> Eth<GEM, rx::DescList, TX> {
pub fn recv_next<'s: 'p, 'p>(&'s mut self) -> Result<Option<rx::PktRef<'p>>, rx::Error> {
let status = self.inner.regs.rx_status.read();
let status = GEM::regs().rx_status.read();
if status.hresp_not_ok() {
// Clear
self.inner.regs.rx_status.write(
GEM::regs().rx_status.write(
regs::RxStatus::zeroed()
.hresp_not_ok(true)
);
@ -315,7 +368,7 @@ impl<'r, TX> Eth<'r, rx::DescList, TX> {
}
if status.rx_overrun() {
// Clear
self.inner.regs.rx_status.write(
GEM::regs().rx_status.write(
regs::RxStatus::zeroed()
.rx_overrun(true)
);
@ -323,7 +376,7 @@ impl<'r, TX> Eth<'r, rx::DescList, TX> {
}
if status.buffer_not_avail() {
// Clear
self.inner.regs.rx_status.write(
GEM::regs().rx_status.write(
regs::RxStatus::zeroed()
.buffer_not_avail(true)
);
@ -335,7 +388,7 @@ impl<'r, TX> Eth<'r, rx::DescList, TX> {
match result {
Ok(None) => {
// No packet, clear status bit
self.inner.regs.rx_status.write(
GEM::regs().rx_status.write(
regs::RxStatus::zeroed()
.frame_recd(true)
);
@ -350,13 +403,13 @@ impl<'r, TX> Eth<'r, rx::DescList, TX> {
}
}
impl<'r, RX> Eth<'r, RX, tx::DescList> {
impl<GEM: Gem, RX> Eth<GEM, RX, tx::DescList> {
pub fn send<'s: 'p, 'p>(&'s mut self, length: usize) -> Option<tx::PktRef<'p>> {
self.tx.send(self.inner.regs, length)
self.tx.send(GEM::regs(), length)
}
}
impl<'r, 'a> smoltcp::phy::Device<'a> for &mut Eth<'r, rx::DescList, tx::DescList> {
impl<'a, GEM: Gem> smoltcp::phy::Device<'a> for &mut Eth<GEM, rx::DescList, tx::DescList> {
type RxToken = rx::PktRef<'a>;
type TxToken = tx::Token<'a>;
@ -380,7 +433,7 @@ impl<'r, 'a> smoltcp::phy::Device<'a> for &mut Eth<'r, rx::DescList, tx::DescLis
match self.rx.recv_next() {
Ok(Some(pktref)) => {
let tx_token = tx::Token {
regs: self.inner.regs,
regs: GEM::regs(),
desc_list: &mut self.tx,
};
Some((pktref, tx_token))
@ -398,33 +451,32 @@ impl<'r, 'a> smoltcp::phy::Device<'a> for &mut Eth<'r, rx::DescList, tx::DescLis
fn transmit(&'a mut self) -> Option<Self::TxToken> {
Some(tx::Token {
regs: self.inner.regs,
regs: GEM::regs(),
desc_list: &mut self.tx,
})
}
}
struct EthInner<'r> {
regs: &'r mut regs::RegisterBlock,
struct EthInner<GEM: Gem> {
gem: PhantomData<GEM>,
link: Option<phy::Link>,
}
impl<'r> EthInner<'r> {
impl<GEM: Gem> EthInner<GEM> {
fn init(&mut self) {
// Clear the Network Control register.
self.regs.net_ctrl.write(regs::NetCtrl::zeroed());
self.regs.net_ctrl.write(regs::NetCtrl::zeroed().clear_stat_regs(true));
GEM::regs().net_ctrl.write(regs::NetCtrl::zeroed());
GEM::regs().net_ctrl.write(regs::NetCtrl::zeroed().clear_stat_regs(true));
// Clear the Status registers.
self.regs.rx_status.write(
GEM::regs().rx_status.write(
regs::RxStatus::zeroed()
.buffer_not_avail(true)
.frame_recd(true)
.rx_overrun(true)
.hresp_not_ok(true)
);
self.regs.tx_status.write(
GEM::regs().tx_status.write(
regs::TxStatus::zeroed()
.used_bit_read(true)
.collision(true)
@ -438,7 +490,7 @@ impl<'r> EthInner<'r> {
.hresp_not_ok(true)
);
// Disable all interrupts.
self.regs.intr_dis.write(
GEM::regs().intr_dis.write(
regs::IntrDis::zeroed()
.mgmt_done(true)
.rx_complete(true)
@ -468,10 +520,10 @@ impl<'r> EthInner<'r> {
.tsu_sec_incr(true)
);
// Clear the buffer queues.
self.regs.rx_qbar.write(
GEM::regs().rx_qbar.write(
regs::RxQbar::zeroed()
);
self.regs.tx_qbar.write(
GEM::regs().tx_qbar.write(
regs::TxQbar::zeroed()
);
}
@ -480,7 +532,7 @@ impl<'r> EthInner<'r> {
let clocks = Clocks::get();
let mdc_clk_div = (clocks.cpu_1x() / MAX_MDC) + 1;
self.regs.net_cfg.write(
GEM::regs().net_cfg.write(
regs::NetCfg::zeroed()
.full_duplex(true)
.gige_en(true)
@ -505,17 +557,17 @@ impl<'r> EthInner<'r> {
(u32::from(macaddr[3]) << 16) |
(u32::from(macaddr[4]) << 8) |
u32::from(macaddr[5]);
self.regs.spec_addr1_top.write(
GEM::regs().spec_addr1_top.write(
regs::SpecAddrTop::zeroed()
.addr_msbs(macaddr_msbs)
);
self.regs.spec_addr1_bot.write(
GEM::regs().spec_addr1_bot.write(
regs::SpecAddrBot::zeroed()
.addr_lsbs(macaddr_lsbs)
);
self.regs.dma_cfg.write(
GEM::regs().dma_cfg.write(
regs::DmaCfg::zeroed()
// 1536 bytes
.ahb_mem_rx_buf_size((MTU >> 6) as u8)
@ -531,7 +583,7 @@ impl<'r> EthInner<'r> {
.ahb_fixed_burst_len(0x10)
);
self.regs.net_ctrl.write(
GEM::regs().net_ctrl.write(
regs::NetCtrl::zeroed()
.mgmt_port_en(true)
);
@ -539,7 +591,7 @@ impl<'r> EthInner<'r> {
fn wait_phy_idle(&self) {
while !self.regs.net_status.read().phy_mgmt_idle() {}
while !GEM::regs().net_status.read().phy_mgmt_idle() {}
}
@ -564,10 +616,10 @@ impl<'r> EthInner<'r> {
S100 => TX_100,
S1000 => TX_1000,
};
Eth::<(), ()>::setup_gem0_clock(txclock);
GEM::setup_clock(txclock);
/* .full_duplex(false) doesn't work even if
half duplex has been negotiated. */
self.regs.net_cfg.modify(|_, w| w
GEM::regs().net_cfg.modify(|_, w| w
.full_duplex(true)
.gige_en(link.speed == S1000)
.speed(link.speed != S10)
@ -587,10 +639,10 @@ impl<'r> EthInner<'r> {
}
}
impl<'r> PhyAccess for EthInner<'r> {
impl<GEM: Gem> PhyAccess for EthInner<GEM> {
fn read_phy(&mut self, addr: u8, reg: u8) -> u16 {
self.wait_phy_idle();
self.regs.phy_maint.write(
GEM::regs().phy_maint.write(
regs::PhyMaint::zeroed()
.clause_22(true)
.operation(regs::PhyOperation::Read)
@ -599,12 +651,12 @@ impl<'r> PhyAccess for EthInner<'r> {
.must_10(0b10)
);
self.wait_phy_idle();
self.regs.phy_maint.read().data()
GEM::regs().phy_maint.read().data()
}
fn write_phy(&mut self, addr: u8, reg: u8, data: u16) {
self.wait_phy_idle();
self.regs.phy_maint.write(
GEM::regs().phy_maint.write(
regs::PhyMaint::zeroed()
.clause_22(true)
.operation(regs::PhyOperation::Write)