From 4bc936f071341840900f1445dcd19cba18747189 Mon Sep 17 00:00:00 2001 From: Egor Savkin Date: Wed, 15 Feb 2023 14:37:55 +0800 Subject: [PATCH] Copy io expander from kasli Signed-off-by: Egor Savkin --- src/runtime/src/io_expander.rs | 165 +++++++++++++++++++++++++++++++++ src/runtime/src/main.rs | 1 + 2 files changed, 166 insertions(+) create mode 100644 src/runtime/src/io_expander.rs diff --git a/src/runtime/src/io_expander.rs b/src/runtime/src/io_expander.rs new file mode 100644 index 00000000..eecb0fa9 --- /dev/null +++ b/src/runtime/src/io_expander.rs @@ -0,0 +1,165 @@ +use crate::pl::csr; +use crate::i2c; + +// 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: u8, + port: u8, + address: u8, + virtual_led_mapping: &'static [(u8, u8, u8)], + iodir: [u8; 2], + out_current: [u8; 2], + out_target: [u8; 2], + registers: Registers, +} + +impl IoExpander { + #[cfg(all(soc_platform = "kasli", hw_rev = "v2.0"))] + pub fn new(index: u8) -> Result { + const VIRTUAL_LED_MAPPING0: [(u8, u8, u8); 2] = [(0, 0, 6), (1, 1, 6)]; + const VIRTUAL_LED_MAPPING1: [(u8, u8, u8); 2] = [(2, 0, 6), (3, 1, 6)]; + + // Both expanders on SHARED I2C bus + let mut io_expander = match index { + 0 => IoExpander { + busno: 0, + port: 11, + address: 0x40, + virtual_led_mapping: &VIRTUAL_LED_MAPPING0, + 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, + virtual_led_mapping: &VIRTUAL_LED_MAPPING1, + 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()? { + #[cfg(feature = "log")] + log::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) + } + + #[cfg(soc_platform = "kasli")] + fn select(&self) -> Result<(), &'static str> { + let mask: u16 = 1 << self.port; + i2c::switch_select(self.busno, 0x70, mask as u8)?; + i2c::switch_select(self.busno, 0x71, (mask >> 8) as u8)?; + Ok(()) + } + + fn write(&self, addr: u8, value: u8) -> Result<(), &'static str> { + i2c::start(self.busno)?; + i2c::write(self.busno, self.address)?; + i2c::write(self.busno, addr)?; + i2c::write(self.busno, value)?; + i2c::stop(self.busno)?; + Ok(()) + } + + fn check_ack(&self) -> Result { + // 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()?; + + for (_led, port, bit) in self.virtual_led_mapping.iter() { + self.iodir[*port as usize] &= !(1 << *bit); + } + 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> { + for (led, port, bit) in self.virtual_led_mapping.iter() { + let level = unsafe { (csr::virtual_leds::status_read() >> led) & 1 }; + self.set(*port, *bit, level != 0); + } + + 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(()) + } +} diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs index 9b707da5..fce660e1 100644 --- a/src/runtime/src/main.rs +++ b/src/runtime/src/main.rs @@ -46,6 +46,7 @@ mod mgmt; mod analyzer; mod irq; mod i2c; +mod io_expander; static mut SEEN_ASYNC_ERRORS: u8 = 0;