libcortex_a9: implement pl310 l2cache

This commit is contained in:
Astro 2020-06-20 02:24:46 +02:00
parent b33ccf83ba
commit 875bc74df9
9 changed files with 295 additions and 5 deletions

1
Cargo.lock generated
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@ -79,6 +79,7 @@ version = "0.0.0"
dependencies = [
"bit_field 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
"libregister 0.0.0",
"volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]

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@ -21,3 +21,29 @@ pub mod time;
pub mod timer;
pub mod sdio;
pub mod logger;
pub use libcortex_a9::pl310::L2Cache;
pub fn l2cache() -> L2Cache {
const PL310_BASEADDR: usize = 0xF8F02000;
L2Cache::new(PL310_BASEADDR)
}
pub fn setup_l2cache() {
slcr::RegisterBlock::unlocked(|slcr| {
assert_eq!(&slcr.unnamed1 as *const _ as u32, 0xF8000A1C);
unsafe { slcr.unnamed1.write(0x020202); }
});
let mut l2 = l2cache();
// TODO: set prefetch
// Configure ZYNQ-specific latency
l2.set_tag_ram_latencies(1, 1, 1);
l2.set_data_ram_latencies(1, 2, 1);
l2.disable_interrupts();
l2.reset_interrupts();
l2.invalidate_all();
l2.enable();
}

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@ -229,15 +229,18 @@ pub struct RegisterBlock {
pub lvl_shftr_en: LvlShftr,
reserved18: [u32; 3],
pub ocm_cfg: RW<u32>,
reserved19: [u32; 123],
reserved19: [u32; 66],
/// barely documented unnamed register to prepare L2 cache setup
pub unnamed1: RW<u32>,
reserved120: [u32; 56],
pub gpiob_ctrl: GpiobCtrl,
pub gpiob_cfg_cmos18: RW<u32>,
pub gpiob_cfg_cmos25: RW<u32>,
pub gpiob_cfg_cmos33: RW<u32>,
reserved20: [u32; 1],
reserved21: [u32; 1],
pub gpiob_cfg_hstl: RW<u32>,
pub gpiob_drvr_bias_ctrl: RW<u32>,
reserved21: [u32; 9],
reserved22: [u32; 9],
pub ddriob_addr0: DdriobConfig,
pub ddriob_addr1: DdriobConfig,
pub ddriob_data0: DdriobConfig,

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@ -11,4 +11,5 @@ default = ["target_zc706"]
[dependencies]
bit_field = "0.10"
volatile-register = "0.2"
libregister = { path = "../libregister" }

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@ -161,7 +161,7 @@ pub unsafe fn dcimvac(addr: usize) {
llvm_asm!("mcr p15, 0, $0, c7, c6, 1" :: "r" (addr) :: "volatile");
}
/// Data cache clean and invalidate for an object.
/// Data cache invalidate for an object.
pub unsafe fn dci<T>(object: &mut T) {
let first_addr = object as *const _ as usize;
let beyond_addr = (object as *const _ as usize) + core::mem::size_of_val(object);

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@ -12,5 +12,6 @@ pub mod mutex;
pub mod sync_channel;
mod uncached;
pub use uncached::UncachedSlice;
pub mod pl310;
global_asm!(include_str!("exceptions.s"));

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@ -0,0 +1,166 @@
//! L2 cache controller
use libregister::RegisterW;
use crate::asm::*;
mod regs;
const CACHE_LINE: usize = 0x20;
const CACHE_LINE_MASK: usize = CACHE_LINE - 1;
#[inline]
fn cache_line_addrs(first_addr: usize, beyond_addr: usize) -> impl Iterator<Item = usize> {
let first_addr = first_addr & !CACHE_LINE_MASK;
let beyond_addr = (beyond_addr | CACHE_LINE_MASK) + 1;
(first_addr..beyond_addr).step_by(CACHE_LINE)
}
fn object_cache_line_addrs<T>(object: &T) -> impl Iterator<Item = usize> {
let first_addr = object as *const _ as usize;
let beyond_addr = (object as *const _ as usize) + core::mem::size_of_val(object);
cache_line_addrs(first_addr, beyond_addr)
}
fn slice_cache_line_addrs<T>(slice: &[T]) -> impl Iterator<Item = usize> {
let first_addr = &slice[0] as *const _ as usize;
let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize) +
core::mem::size_of_val(&slice[slice.len() - 1]);
cache_line_addrs(first_addr, beyond_addr)
}
pub struct L2Cache {
pub regs: &'static mut regs::RegisterBlock,
}
impl L2Cache {
pub fn new(register_baseaddr: usize) -> Self {
let regs = unsafe {
regs::RegisterBlock::new_at(register_baseaddr)
};
L2Cache { regs }
}
pub fn set_tag_ram_latencies(&mut self, setup_lat: u8, rd_access_lat: u8, wr_access_lat: u8) {
self.regs.tag_ram_control.write(
regs::RamControl::zeroed()
.setup_lat(setup_lat)
.rd_access_lat(rd_access_lat)
.wr_access_lat(wr_access_lat)
);
}
pub fn set_data_ram_latencies(&mut self, setup_lat: u8, rd_access_lat: u8, wr_access_lat: u8) {
self.regs.data_ram_control.write(
regs::RamControl::zeroed()
.setup_lat(setup_lat)
.rd_access_lat(rd_access_lat)
.wr_access_lat(wr_access_lat)
);
}
pub fn disable_interrupts(&mut self) {
self.regs.int_mask.write(
regs::Interrupts::zeroed()
.ecntr(true)
.parrt(true)
.parrd(true)
.errwt(true)
.errwd(true)
.errrt(true)
.errrd(true)
.slverr(true)
.decerr(true)
);
}
pub fn reset_interrupts(&mut self) {
self.regs.int_clear.write(
regs::Interrupts::zeroed()
.ecntr(true)
.parrt(true)
.parrd(true)
.errwt(true)
.errwd(true)
.errrt(true)
.errrd(true)
.slverr(true)
.decerr(true)
);
}
pub fn invalidate_all(&mut self) {
unsafe { self.regs.inv_way.write(0xFFFF); }
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
pub fn enable(&mut self) {
dmb();
self.regs.control.write(
regs::Control::zeroed()
.l2_enable(true)
);
dsb();
}
pub fn clean_invalidate<T>(&mut self, obj: &T) {
dmb();
for addr in object_cache_line_addrs(obj) {
unsafe {
self.regs.clean_inv_pa.write(addr as u32);
}
}
dsb();
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
pub fn clean_invalidate_slice<T>(&mut self, slice: &[T]) {
dmb();
for addr in slice_cache_line_addrs(slice) {
unsafe {
self.regs.clean_inv_pa.write(addr as u32);
}
}
dsb();
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
pub fn clean_slice<T>(&mut self, slice: &[T]) {
dmb();
for addr in slice_cache_line_addrs(slice) {
unsafe {
self.regs.clean_pa.write(addr as u32);
}
}
dsb();
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
pub fn invalidate<T>(&mut self, obj: &mut T) {
dmb();
for addr in object_cache_line_addrs(obj) {
unsafe {
self.regs.inv_pa.write(addr as u32);
}
}
dsb();
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
pub fn invalidate_slice<T>(&mut self, slice: &mut [T]) {
dmb();
for addr in slice_cache_line_addrs(slice) {
unsafe {
self.regs.inv_pa.write(addr as u32);
}
}
dsb();
unsafe { self.regs.cache_sync.write(1); }
while self.regs.cache_sync.read() != 0 {}
}
}

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@ -0,0 +1,93 @@
use volatile_register::{RO, WO, RW};
use libregister::{register, register_bit, register_bits, RegisterW};
#[repr(C)]
pub struct RegisterBlock {
pub cache_id: RW<u32>,
pub cache_type: RW<u32>,
pub _unused1: [RO<u32>; 62],
pub control: Control,
pub aux_control: RW<u32>,
pub tag_ram_control: RamControl,
pub data_ram_control: RamControl,
pub _unused2: [RO<u32>; 60],
pub ev_counter_ctrl: RW<u32>,
pub ev_counter1_cfg: RW<u32>,
pub ev_counter2_cfg: RW<u32>,
pub ev_counter1: RW<u32>,
pub ev_counter2: RW<u32>,
pub int_mask: Interrupts,
pub int_mask_status: Interrupts,
pub int_raw_status: Interrupts,
pub int_clear: Interrupts,
pub _unused3: [RO<u32>; 323],
pub cache_sync: RW<u32>,
pub _unused4: [RO<u32>; 15],
pub inv_pa: RW<u32>,
pub _unused5: [RO<u32>; 2],
pub inv_way: RW<u32>,
pub _unused6: [RO<u32>; 12],
pub clean_pa: RW<u32>,
pub _unused7: [RO<u32>; 1],
pub clean_index: RW<u32>,
pub clean_way: RW<u32>,
pub _unused8: [RO<u32>; 12],
pub clean_inv_pa: RW<u32>,
pub _unused9: [RO<u32>; 1],
pub clean_inv_index: RW<u32>,
pub clean_inv_way: RW<u32>,
pub _unused10: [RO<u32>; 64],
pub d_lockdown0: RW<u32>,
pub i_lockdown0: RW<u32>,
pub d_lockdown1: RW<u32>,
pub i_lockdown1: RW<u32>,
pub d_lockdown2: RW<u32>,
pub i_lockdown2: RW<u32>,
pub d_lockdown3: RW<u32>,
pub i_lockdown3: RW<u32>,
pub d_lockdown4: RW<u32>,
pub i_lockdown4: RW<u32>,
pub d_lockdown5: RW<u32>,
pub i_lockdown5: RW<u32>,
pub d_lockdown6: RW<u32>,
pub i_lockdown6: RW<u32>,
pub d_lockdown7: RW<u32>,
pub i_lockdown7: RW<u32>,
pub _unused11: [RO<u32>; 4],
pub lock_line_en: RW<u32>,
pub unlock_way: RW<u32>,
pub _unused12: [RO<u32>; 170],
pub addr_filtering_start: RW<u32>,
pub addr_filtering_end: RW<u32>,
pub _unused13: [RO<u32>; 206],
pub debug_ctrl: RW<u32>,
pub _unused14: [RO<u32>; 7],
pub prefetch_ctrl: RW<u32>,
pub _unused15: [RO<u32>; 7],
pub power_ctrl: RW<u32>,
}
impl RegisterBlock {
pub unsafe fn new_at(baseaddr: usize) -> &'static mut Self {
&mut *(baseaddr as *mut _)
}
}
register!(control, Control, RW, u32);
register_bit!(control, l2_enable, 0);
register!(ram_control, RamControl, RW, u32);
register_bits!(ram_control, setup_lat, u8, 0, 2);
register_bits!(ram_control, rd_access_lat, u8, 4, 6);
register_bits!(ram_control, wr_access_lat, u8, 8, 10);
register!(interrupts, Interrupts, RW, u32);
register_bit!(interrupts, ecntr, 0);
register_bit!(interrupts, parrt, 1);
register_bit!(interrupts, parrd, 2);
register_bit!(interrupts, errwt, 3);
register_bit!(interrupts, errwd, 4);
register_bit!(interrupts, errrt, 5);
register_bit!(interrupts, errrd, 6);
register_bit!(interrupts, slverr, 7);
register_bit!(interrupts, decerr, 8);

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@ -138,7 +138,6 @@ pub struct ACTLR;
wrap_reg!(actlr);
def_reg_r!(ACTLR, actlr::Read, "mrc p15, 0, $0, c1, c0, 1");
def_reg_w!(ACTLR, actlr::Write, "mcr p15, 0, $0, c1, c0, 1");
// SMP bit
register_bit!(actlr, parity_on, 9);
register_bit!(actlr, alloc_one_way, 8);
register_bit!(actlr, excl, 7);