mirror of https://github.com/m-labs/artiq
122 lines
3.0 KiB
Rust
122 lines
3.0 KiB
Rust
use core::cmp;
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use csr;
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pub const SECTOR_SIZE: usize = csr::CONFIG_SPIFLASH_SECTOR_SIZE as usize;
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pub const PAGE_SIZE: usize = csr::CONFIG_SPIFLASH_PAGE_SIZE as usize;
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const PAGE_MASK: usize = PAGE_SIZE - 1;
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const CMD_PP: u8 = 0x02;
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// const CMD_WRDI: u8 = 0x04;
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const CMD_RDSR: u8 = 0x05;
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const CMD_WREN: u8 = 0x06;
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const CMD_SE: u8 = 0xd8;
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const PIN_CLK: u8 = 1 << 1;
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const PIN_CS_N: u8 = 1 << 2;
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const PIN_DQ_I: u8 = 1 << 3;
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const SR_WIP: u8 = 1;
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unsafe fn write_byte(mut byte: u8) {
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csr::spiflash::bitbang_write(0);
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for _ in 0..8 {
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csr::spiflash::bitbang_write((byte & 0x80) >> 7);
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csr::spiflash::bitbang_write((byte & 0x80) >> 7 | PIN_CLK);
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byte <<= 1;
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}
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csr::spiflash::bitbang_write(0);
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}
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unsafe fn write_addr(mut addr: usize) {
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csr::spiflash::bitbang_write(0);
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for _ in 0..24 {
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csr::spiflash::bitbang_write(((addr & 0x800000) >> 23) as u8);
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csr::spiflash::bitbang_write(((addr & 0x800000) >> 23) as u8 | PIN_CLK);
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addr <<= 1;
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}
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csr::spiflash::bitbang_write(0);
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}
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fn wait_until_ready() {
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unsafe {
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loop {
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let mut sr = 0;
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write_byte(CMD_RDSR);
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for _ in 0..8 {
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sr <<= 1;
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csr::spiflash::bitbang_write(PIN_DQ_I | PIN_CLK);
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sr |= csr::spiflash::miso_read();
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csr::spiflash::bitbang_write(PIN_DQ_I);
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}
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csr::spiflash::bitbang_write(0);
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csr::spiflash::bitbang_write(PIN_CS_N);
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if sr & SR_WIP == 0 {
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return
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}
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}
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}
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}
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pub unsafe fn erase_sector(addr: usize) {
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let sector_addr = addr & !(csr::CONFIG_SPIFLASH_SECTOR_SIZE as usize - 1);
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csr::spiflash::bitbang_en_write(1);
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wait_until_ready();
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write_byte(CMD_WREN);
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csr::spiflash::bitbang_write(PIN_CS_N);
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write_byte(CMD_SE);
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write_addr(sector_addr);
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csr::spiflash::bitbang_write(PIN_CS_N);
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wait_until_ready();
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csr::spiflash::bitbang_en_write(0);
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}
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unsafe fn write_page(addr: usize, data: &[u8]) {
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csr::spiflash::bitbang_en_write(1);
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wait_until_ready();
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write_byte(CMD_WREN);
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csr::spiflash::bitbang_write(PIN_CS_N);
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write_byte(CMD_PP);
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write_addr(addr);
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for &byte in data {
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write_byte(byte)
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}
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csr::spiflash::bitbang_write(PIN_CS_N);
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csr::spiflash::bitbang_write(0);
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wait_until_ready();
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csr::spiflash::bitbang_en_write(0);
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}
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pub unsafe fn write(mut addr: usize, mut data: &[u8]) {
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if addr & PAGE_MASK != 0 {
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let size = cmp::min((PAGE_SIZE - (addr & PAGE_MASK)) as usize, data.len());
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write_page(addr, &data[..size]);
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addr += size;
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data = &data[size..];
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}
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while data.len() > 0 {
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let size = cmp::min(PAGE_SIZE as usize, data.len());
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write_page(addr, &data[..size]);
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addr += size;
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data = &data[size..];
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}
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}
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#[cfg(any(soc_platform = "kasli", soc_platform = "kc705"))]
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pub unsafe fn reload () -> ! {
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csr::icap::iprog_write(1);
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loop {}
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}
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