runtime: drive SFP TX_DISABLE

Signed-off-by: Egor Savkin <es@m-labs.hk>
This commit is contained in:
Egor Savkin 2023-02-15 14:37:55 +08:00 committed by Sebastien Bourdeauducq
parent 709aa8195b
commit 99ebc2fcdb
2 changed files with 170 additions and 0 deletions

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@ -0,0 +1,149 @@
use crate::i2c;
use log::info;
// Only the bare minimum registers. Bits/IO connections equivalent between IC types.
struct Registers {
// PCA9539 equivalent register names in comments
iodira: u8, // Configuration Port 0
iodirb: u8, // Configuration Port 1
gpioa: u8, // Output Port 0
gpiob: u8, // Output Port 1
}
pub struct IoExpander {
busno: i32,
port: u8,
address: i32,
iodir: [u8; 2],
out_current: [u8; 2],
out_target: [u8; 2],
registers: Registers,
}
impl IoExpander {
pub fn new(index: u8) -> Result<Self, &'static str> {
// Both expanders on SHARED I2C bus
let mut io_expander = match index {
0 => IoExpander {
busno: 0,
port: 11,
address: 0x40,
iodir: [0xff; 2],
out_current: [0; 2],
out_target: [0; 2],
registers: Registers {
iodira: 0x00,
iodirb: 0x01,
gpioa: 0x12,
gpiob: 0x13,
},
},
1 => IoExpander {
busno: 0,
port: 11,
address: 0x42,
iodir: [0xff; 2],
out_current: [0; 2],
out_target: [0; 2],
registers: Registers {
iodira: 0x00,
iodirb: 0x01,
gpioa: 0x12,
gpiob: 0x13,
},
},
_ => return Err("incorrect I/O expander index"),
};
if !io_expander.check_ack()? {
info!(
"MCP23017 io expander {} not found. Checking for PCA9539.",
index
);
io_expander.address += 0xa8; // translate to PCA9539 addresses (see schematic)
io_expander.registers = Registers {
iodira: 0x06,
iodirb: 0x07,
gpioa: 0x02,
gpiob: 0x03,
};
if !io_expander.check_ack()? {
return Err("Neither MCP23017 nor PCA9539 io expander found.");
};
}
Ok(io_expander)
}
fn select(&self) -> Result<(), &'static str> {
let mask: u16 = 1 << self.port;
i2c::switch_select(self.busno, 0x70, mask as u8 as i32);
i2c::switch_select(self.busno, 0x71, (mask >> 8) as u8 as i32);
Ok(())
}
fn write(&self, addr: u8, value: u8) -> Result<(), &'static str> {
i2c::start(self.busno);
i2c::write(self.busno, self.address as i32);
i2c::write(self.busno, addr as i32);
i2c::write(self.busno, value as i32);
i2c::stop(self.busno);
Ok(())
}
fn check_ack(&self) -> Result<bool, &'static str> {
// Check for ack from io expander
self.select()?;
i2c::start(self.busno);
let ack = i2c::write(self.busno, self.address);
i2c::stop(self.busno);
Ok(ack)
}
fn update_iodir(&self) -> Result<(), &'static str> {
self.write(self.registers.iodira, self.iodir[0])?;
self.write(self.registers.iodirb, self.iodir[1])?;
Ok(())
}
pub fn init(&mut self) -> Result<(), &'static str> {
self.select()?;
self.update_iodir()?;
self.out_current[0] = 0x00;
self.write(self.registers.gpioa, 0x00)?;
self.out_current[1] = 0x00;
self.write(self.registers.gpiob, 0x00)?;
Ok(())
}
pub fn set_oe(&mut self, port: u8, outputs: u8) -> Result<(), &'static str> {
self.iodir[port as usize] &= !outputs;
self.update_iodir()?;
Ok(())
}
pub fn set(&mut self, port: u8, bit: u8, high: bool) {
if high {
self.out_target[port as usize] |= 1 << bit;
} else {
self.out_target[port as usize] &= !(1 << bit);
}
}
pub fn service(&mut self) -> Result<(), &'static str> {
if self.out_target != self.out_current {
self.select()?;
if self.out_target[0] != self.out_current[0] {
self.write(self.registers.gpioa, self.out_target[0])?;
self.out_current[0] = self.out_target[0];
}
if self.out_target[1] != self.out_current[1] {
self.write(self.registers.gpiob, self.out_target[1])?;
self.out_current[1] = self.out_target[1];
}
}
Ok(())
}
}

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@ -45,6 +45,8 @@ mod mgmt;
mod analyzer;
mod irq;
mod i2c;
#[cfg(feature = "target_kasli_soc")]
mod io_expander;
static mut SEEN_ASYNC_ERRORS: u8 = 0;
@ -113,6 +115,25 @@ pub fn main_core0() {
i2c::init();
#[cfg(feature = "target_kasli_soc")]
{
let (mut io_expander0, mut io_expander1) = (io_expander::IoExpander::new(0).unwrap(), io_expander::IoExpander::new(1).unwrap());
io_expander0.init().expect("I2C I/O expander #0 initialization failed");
io_expander1.init().expect("I2C I/O expander #1 initialization failed");
// Actively drive TX_DISABLE to false on SFP0..3
io_expander0.set_oe(0, 1 << 1).unwrap();
io_expander0.set_oe(1, 1 << 1).unwrap();
io_expander1.set_oe(0, 1 << 1).unwrap();
io_expander1.set_oe(1, 1 << 1).unwrap();
io_expander0.set(0, 1, false);
io_expander0.set(1, 1, false);
io_expander1.set(0, 1, false);
io_expander1.set(1, 1, false);
io_expander0.service().unwrap();
io_expander1.service().unwrap();
}
let cfg = match Config::new() {
Ok(cfg) => cfg,
Err(err) => {