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use core::ptr::write_volatile;
use core::sync::atomic::{Ordering, fence};
use super::{FlashBank, FlashSector, WRITE_SIZE};
use crate::flash::Error;
use crate::pac;
pub(crate) unsafe fn lock() {
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().modify(|w| w.set_lock(true));
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().modify(|w| w.set_lock(true));
}
pub(crate) unsafe fn unlock() {
#[cfg(feature = "trustzone-secure")]
if pac::FLASH.seccr().read().lock() {
pac::FLASH.seckeyr().write_value(0x4567_0123);
pac::FLASH.seckeyr().write_value(0xCDEF_89AB);
}
#[cfg(not(feature = "trustzone-secure"))]
if pac::FLASH.nscr().read().lock() {
pac::FLASH.nskeyr().write_value(0x4567_0123);
pac::FLASH.nskeyr().write_value(0xCDEF_89AB);
}
}
pub(crate) unsafe fn enable_blocking_write() {
assert_eq!(0, WRITE_SIZE % 4);
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().write(|w| {
w.set_pg(true);
});
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().write(|w| {
w.set_pg(true);
});
}
pub(crate) unsafe fn disable_blocking_write() {
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().write(|w| w.set_pg(false));
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().write(|w| w.set_pg(false));
}
pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE]) -> Result<(), Error> {
let mut address = start_address;
for val in buf.chunks(4) {
write_volatile(address as *mut u32, u32::from_le_bytes(unwrap!(val.try_into())));
address += val.len() as u32;
// prevents parallelism errors
fence(Ordering::SeqCst);
}
blocking_wait_ready()
}
pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().modify(|w| {
w.set_per(pac::flash::vals::SeccrPer::B_0X1);
w.set_pnb(sector.index_in_bank);
// TODO: add check for bank swap
w.set_bker(match sector.bank {
FlashBank::Bank1 => false,
FlashBank::Bank2 => true,
_ => unreachable!(),
});
});
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().modify(|w| {
w.set_per(true);
w.set_pnb(sector.index_in_bank);
// TODO: add check for bank swap
w.set_bker(match sector.bank {
FlashBank::Bank1 => false,
FlashBank::Bank2 => true,
_ => unreachable!(),
});
});
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().modify(|w| {
w.set_strt(true);
});
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().modify(|w| {
w.set_strt(true);
});
let ret: Result<(), Error> = blocking_wait_ready();
#[cfg(feature = "trustzone-secure")]
pac::FLASH.seccr().modify(|w| w.set_per(false));
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nscr().modify(|w| w.set_per(false));
clear_all_err();
ret
}
pub(crate) unsafe fn clear_all_err() {
// read and write back the same value.
// This clears all "write 1 to clear" bits.
#[cfg(feature = "trustzone-secure")]
pac::FLASH.secsr().modify(|_| {});
#[cfg(not(feature = "trustzone-secure"))]
pac::FLASH.nssr().modify(|_| {});
}
unsafe fn blocking_wait_ready() -> Result<(), Error> {
loop {
#[cfg(feature = "trustzone-secure")]
let sr = pac::FLASH.secsr().read();
#[cfg(not(feature = "trustzone-secure"))]
let sr = pac::FLASH.nssr().read();
if !sr.bsy() {
if sr.pgserr() {
return Err(Error::Seq);
}
if sr.sizerr() {
return Err(Error::Size);
}
if sr.pgaerr() {
return Err(Error::Unaligned);
}
if sr.wrperr() {
return Err(Error::Protected);
}
if sr.progerr() {
return Err(Error::Prog);
}
return Ok(());
}
}
}
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