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rp2040: move in_ram helper outside of Flash's impl

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Allow it to be called from other modules.
This commit is contained in:
Scott Mansell 2023-09-23 17:34:08 +12:00 committed by Dario Nieuwenhuis
parent f30fc949ff
commit c6d53e7bce
1 changed files with 39 additions and 39 deletions
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78
embassy-rp/src/flash.rs
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@ -131,7 +131,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
let len = to - from; let len = to - from;
unsafe { self.in_ram(|| ram_helpers::flash_range_erase(from, len))? }; unsafe { in_ram(|| ram_helpers::flash_range_erase(from, len))? };
Ok(()) Ok(())
} }
@ -156,7 +156,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
let unaligned_offset = offset as usize - start; let unaligned_offset = offset as usize - start;
unsafe { self.in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? } unsafe { in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
} }
let remaining_len = bytes.len() - start_padding; let remaining_len = bytes.len() - start_padding;
@ -174,12 +174,12 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
if bytes.as_ptr() as usize >= 0x2000_0000 { if bytes.as_ptr() as usize >= 0x2000_0000 {
let aligned_data = &bytes[start_padding..end_padding]; let aligned_data = &bytes[start_padding..end_padding];
unsafe { self.in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, aligned_data))? } unsafe { in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, aligned_data))? }
} else { } else {
for chunk in bytes[start_padding..end_padding].chunks_exact(PAGE_SIZE) { for chunk in bytes[start_padding..end_padding].chunks_exact(PAGE_SIZE) {
let mut ram_buf = [0xFF_u8; PAGE_SIZE]; let mut ram_buf = [0xFF_u8; PAGE_SIZE];
ram_buf.copy_from_slice(chunk); ram_buf.copy_from_slice(chunk);
unsafe { self.in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, &ram_buf))? } unsafe { in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, &ram_buf))? }
aligned_offset += PAGE_SIZE; aligned_offset += PAGE_SIZE;
} }
} }
@ -194,47 +194,15 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
let unaligned_offset = end_offset - (PAGE_SIZE - rem_offset); let unaligned_offset = end_offset - (PAGE_SIZE - rem_offset);
unsafe { self.in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? } unsafe { in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
} }
Ok(()) Ok(())
} }
/// Make sure to uphold the contract points with rp2040-flash.
/// - interrupts must be disabled
/// - DMA must not access flash memory
unsafe fn in_ram(&mut self, operation: impl FnOnce()) -> Result<(), Error> {
// Make sure we're running on CORE0
let core_id: u32 = pac::SIO.cpuid().read();
if core_id != 0 {
return Err(Error::InvalidCore);
}
// Make sure CORE1 is paused during the entire duration of the RAM function
crate::multicore::pause_core1();
critical_section::with(|_| {
// Wait for all DMA channels in flash to finish before ram operation
const SRAM_LOWER: u32 = 0x2000_0000;
for n in 0..crate::dma::CHANNEL_COUNT {
let ch = crate::pac::DMA.ch(n);
while ch.read_addr().read() < SRAM_LOWER && ch.ctrl_trig().read().busy() {}
}
// Wait for completion of any background reads
while pac::XIP_CTRL.stream_ctr().read().0 > 0 {}
// Run our flash operation in RAM
operation();
});
// Resume CORE1 execution
crate::multicore::resume_core1();
Ok(())
}
/// Read SPI flash unique ID /// Read SPI flash unique ID
pub fn blocking_unique_id(&mut self, uid: &mut [u8]) -> Result<(), Error> { pub fn blocking_unique_id(&mut self, uid: &mut [u8]) -> Result<(), Error> {
unsafe { self.in_ram(|| ram_helpers::flash_unique_id(uid))? }; unsafe { in_ram(|| ram_helpers::flash_unique_id(uid))? };
Ok(()) Ok(())
} }
@ -242,7 +210,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
pub fn blocking_jedec_id(&mut self) -> Result<u32, Error> { pub fn blocking_jedec_id(&mut self) -> Result<u32, Error> {
let mut jedec = None; let mut jedec = None;
unsafe { unsafe {
self.in_ram(|| { in_ram(|| {
jedec.replace(ram_helpers::flash_jedec_id()); jedec.replace(ram_helpers::flash_jedec_id());
})?; })?;
}; };
@ -871,6 +839,38 @@ mod ram_helpers {
} }
} }
/// Make sure to uphold the contract points with rp2040-flash.
/// - interrupts must be disabled
/// - DMA must not access flash memory
pub(crate) unsafe fn in_ram(operation: impl FnOnce()) -> Result<(), Error> {
// Make sure we're running on CORE0
let core_id: u32 = pac::SIO.cpuid().read();
if core_id != 0 {
return Err(Error::InvalidCore);
}
// Make sure CORE1 is paused during the entire duration of the RAM function
crate::multicore::pause_core1();
critical_section::with(|_| {
// Wait for all DMA channels in flash to finish before ram operation
const SRAM_LOWER: u32 = 0x2000_0000;
for n in 0..crate::dma::CHANNEL_COUNT {
let ch = crate::pac::DMA.ch(n);
while ch.read_addr().read() < SRAM_LOWER && ch.ctrl_trig().read().busy() {}
}
// Wait for completion of any background reads
while pac::XIP_CTRL.stream_ctr().read().0 > 0 {}
// Run our flash operation in RAM
operation();
});
// Resume CORE1 execution
crate::multicore::resume_core1();
Ok(())
}
mod sealed { mod sealed {
pub trait Instance {} pub trait Instance {}
pub trait Mode {} pub trait Mode {}