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zynq-rs
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zynq::flash: fix + refactor

This commit is contained in:
Astro 2019-12-04 23:56:38 +01:00
parent cfaa1213e2
commit 45cc271735
2 changed files with 207 additions and 41 deletions
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37
src/zynq/flash/instr.rs Normal file
View File

@ -0,0 +1,37 @@
use super::Transfer;
pub trait Instruction {
type Args: Iterator<Item = u32>;
type Result: for<'r, 't> From<&'t mut Transfer<'r, Self::Args>>;
fn inst_code() -> u8;
fn args(&self) -> Self::Args;
}
pub struct ReadId;
impl Instruction for ReadId {
type Result = u32; // TODO: u8;
type Args = core::iter::Empty<u32>;
fn inst_code() -> u8 {
0x9f
}
fn args(&self) -> Self::Args {
core::iter::empty()
}
}
/// Read configuration register
pub struct RdCr;
impl Instruction for RdCr {
type Result = u8;
type Args = core::iter::Empty<u32>;
fn inst_code() -> u8 {
0x35
}
fn args(&self) -> Self::Args {
core::iter::empty()
}
}

211
src/zynq/flash/mod.rs
View File

@ -5,7 +5,8 @@ use crate::regs::{RegisterR, RegisterW, RegisterRW};
use super::slcr;
use super::clocks::CpuClocks;
pub mod regs;
mod regs;
mod instr;
const FLASH_BAUD_RATE: u32 = 50_000_000;
const SINGLE_CAPACITY: u32 = 16 * 1024 * 1024;
@ -28,6 +29,44 @@ impl<MODE> Flash<MODE> {
_mode: PhantomData,
}
}
fn disable_interrupts(&mut self) {
self.regs.intr_dis.write(
regs::IntrDis::zeroed()
.rx_overflow(true)
.tx_fifo_not_full(true)
.tx_fifo_full(true)
.rx_fifo_not_empty(true)
.rx_fifo_full(true)
.tx_fifo_underflow(true)
);
}
fn enable_interrupts(&mut self) {
self.regs.intr_en.write(
regs::IntrEn::zeroed()
.rx_overflow(true)
.tx_fifo_not_full(true)
.tx_fifo_full(true)
.rx_fifo_not_empty(true)
.rx_fifo_full(true)
.tx_fifo_underflow(true)
);
}
fn clear_rx_fifo(&self) {
while self.regs.intr_status.read().rx_fifo_not_empty() {
let _ = self.regs.rx_data.read();
}
}
fn clear_interrupt_status(&mut self) {
self.regs.intr_status.write(
regs::IntrStatus::zeroed()
.rx_overflow(true)
.tx_fifo_underflow(true)
);
}
}
impl Flash<()> {
@ -160,8 +199,16 @@ impl Flash<()> {
}
fn configure(&mut self, divider: u32) {
// Disable
self.regs.enable.write(
regs::Enable::zeroed()
);
self.disable_interrupts();
self.regs.lqspi_cfg.write(
regs::LqspiCfg::zeroed()
);
self.clear_rx_fifo();
self.clear_interrupt_status();
// for a baud_rate_div=1 LPBK_DLY_ADJ would be required
let mut baud_rate_div = 2u32;
@ -173,6 +220,7 @@ impl Flash<()> {
.baud_rate_div(baud_rate_div as u8)
.mode_sel(true)
.leg_flsh(true)
.holdb_dr(true)
// 32 bits TX FIFO width
.fifo_width(0b11)
);
@ -184,30 +232,13 @@ impl Flash<()> {
}
}
fn disable_interrupts(&mut self) {
self.regs.intr_dis.write(
regs::IntrDis::zeroed()
.rx_overflow(true)
.tx_fifo_not_full(true)
.tx_fifo_full(true)
.rx_fifo_not_empty(true)
.rx_fifo_full(true)
.tx_fifo_underflow(true)
);
}
fn clear_rx_fifo(&self) {
while self.regs.intr_status.read().rx_fifo_not_empty() {
let _ = self.regs.rx_data.read();
}
}
pub fn linear_addressing_mode(self) -> Flash<LinearAddressing> {
// Set manual start enable to auto mode.
// Assert the chip select.
self.regs.config.modify(|_, w| w
.man_start_en(false)
.pcs(false)
.manual_cs(false)
);
self.regs.lqspi_cfg.write(regs::LqspiCfg::zeroed()
@ -218,11 +249,15 @@ impl Flash<()> {
.mode_en(true)
// 2 devices
.two_mem(true)
.u_page(false)
// Linear Addressing Mode
.lq_mode(true)
);
self.regs.enable.modify(|_, w| w.spi_en(true));
self.regs.enable.write(
regs::Enable::zeroed()
.spi_en(true)
);
self.transition()
}
@ -240,13 +275,14 @@ impl Flash<()> {
// 2 devices
.two_mem(true)
.u_page(chip_index != 0)
// Manual I/O mode
.lq_mode(false)
);
self.regs.config.modify(|_, w| w
.pcs(false)
self.regs.enable.write(
regs::Enable::zeroed()
.spi_en(true)
);
self.regs.enable.modify(|_, w| w.spi_en(true));
self.transition()
}
}
@ -272,17 +308,21 @@ impl Flash<LinearAddressing> {
impl Flash<Manual> {
pub fn stop(self) -> Flash<()> {
self.regs.enable.modify(|_, w| w.spi_en(false));
// De-assert chip select.
self.regs.config.modify(|_, w| w.pcs(true));
self.transition()
}
pub fn rdcr(&mut self) -> u8 {
self.transfer(instr::RdCr)
}
pub fn transfer<I: instr::Instruction>(&mut self, input: I) -> I::Result {
let mut t = Transfer::new(&mut self.regs, I::inst_code(), input.args());
(&mut t).into()
}
pub fn read(&mut self, offset: u32, dest: &mut [u8]) {
self.regs.config.modify(|_, w| w.man_start_com(true));
// Quad I/O Read
// Quad Read
let instr = 0xEB;
unsafe {
self.regs.txd0.write(
@ -290,29 +330,118 @@ impl Flash<Manual> {
(offset << 8)
);
}
while self.regs.intr_status.read().tx_fifo_not_full() {
let mut n = 0;
while !self.regs.intr_status.read().tx_fifo_full() {
unsafe {
self.regs.txd0.write(0);
}
let rx = self.regs.rx_data.read();
n += 1;
}
for d in dest {
self.regs.config.modify(|_, w| w
.pcs(false)
.man_start_com(true)
);
let mut offset = 0;
while offset < dest.len() {
while !self.regs.intr_status.read().rx_fifo_not_empty() {}
// TODO: drops data?
let rx = self.regs.rx_data.read();
*d = rx as u8;
if offset < dest.len() {
dest[offset] = rx as u8;
}
offset += 1;
if offset < dest.len() {
dest[offset] = (rx >> 8) as u8;
}
offset += 1;
if offset < dest.len() {
dest[offset] = (rx >> 16) as u8;
}
offset += 1;
if offset < dest.len() {
dest[offset] = (rx << 24) as u8;
}
offset += 1;
// Output dummy byte to generate clock for further RX
unsafe {
self.regs.txd1.write(0);
self.regs.txd0.write(0);
}
}
}
fn wait_tx_not_full(&self) {
while self.regs.intr_status.read().tx_fifo_full() {}
self.regs.config.modify(|_, w| w
.pcs(true)
.man_start_com(false)
);
}
}
pub struct Transfer<'r, Args: Iterator<Item = u32>> {
regs: &'r mut regs::RegisterBlock,
args: Args,
}
impl<'r, Args: Iterator<Item = u32>> Transfer<'r, Args> {
pub fn new(regs: &'r mut regs::RegisterBlock, inst_code: u8, mut args: Args) -> Self
where
Args: Iterator<Item = u32>,
{
unsafe {
regs.txd1.write(inst_code.into());
}
while !regs.intr_status.read().tx_fifo_full() {
let arg = args.next().unwrap_or(0);
unsafe {
regs.txd0.write(arg);
}
}
regs.config.modify(|_, w| w
.pcs(false)
.man_start_com(true)
);
Transfer { regs, args }
}
pub fn recv(&mut self) -> u32 {
while !self.regs.intr_status.read().rx_fifo_not_empty() {}
let rx = self.regs.rx_data.read();
let arg = self.args.next().unwrap_or(0);
unsafe {
self.regs.txd0.write(arg);
}
rx
}
}
impl<'r, Args: Iterator<Item = u32>> Drop for Transfer<'r, Args> {
fn drop(&mut self) {
self.regs.config.modify(|_, w| w
.pcs(true)
.man_start_com(false)
);
}
}
impl<'t, Args: Iterator<Item = u32>> From<&'t mut Transfer<'_, Args>> for u32 {
fn from(t: &mut Transfer<'_, Args>) -> u32 {
t.recv()
}
}
impl<Args: Iterator<Item = u32>> From<&mut Transfer<'_, Args>> for u8 {
fn from(t: &mut Transfer<'_, Args>) -> u8 {
u32::from(t) as u8
}
}
impl<Args: Iterator<Item = u32>> From<&mut Transfer<'_, Args>> for u16 {
fn from(t: &mut Transfer<'_, Args>) -> u16 {
u32::from(t) as u16
}
}