strat9_bus_drivers/
omap_ocp2scp.rs

1use crate::{BusChild, BusDriver, BusError, PowerState, mmio::MmioRegion};
2use alloc::{string::String, vec::Vec};
3
4const OCP2SCP_TIMING: usize = 0x18;
5const SYNC2_MASK: u32 = 0xF;
6const SYNC2_SAFE_VALUE: u32 = 0x6;
7
8const COMPATIBLE: &[&str] = &["ti,omap-ocp2scp", "ti,am437x-ocp2scp"];
9
10pub struct OmapOcp2Scp {
11    regs: MmioRegion,
12    power_state: PowerState,
13    is_am437x: bool,
14    children: Vec<BusChild>,
15}
16
17impl OmapOcp2Scp {
18    /// Creates a new instance.
19    pub fn new() -> Self {
20        Self {
21            regs: MmioRegion::new(),
22            power_state: PowerState::Off,
23            is_am437x: false,
24            children: Vec::new(),
25        }
26    }
27
28    /// Sets am437x.
29    pub fn set_am437x(&mut self, am437x: bool) {
30        self.is_am437x = am437x;
31    }
32
33    /// Performs the add child operation.
34    pub fn add_child(&mut self, child: BusChild) {
35        self.children.push(child);
36    }
37
38    /// Performs the configure timing operation.
39    fn configure_timing(&self) {
40        if self.is_am437x || !self.regs.is_valid() {
41            return;
42        }
43        let mut reg = self.regs.read32(OCP2SCP_TIMING);
44        reg &= !SYNC2_MASK;
45        reg |= SYNC2_SAFE_VALUE;
46        self.regs.write32(OCP2SCP_TIMING, reg);
47    }
48}
49
50impl BusDriver for OmapOcp2Scp {
51    /// Performs the name operation.
52    fn name(&self) -> &str {
53        "omap-ocp2scp"
54    }
55
56    /// Performs the compatible operation.
57    fn compatible(&self) -> &[&str] {
58        COMPATIBLE
59    }
60
61    /// Performs the init operation.
62    fn init(&mut self, base: usize) -> Result<(), BusError> {
63        self.regs.init(base, 0x20);
64        self.configure_timing();
65        self.power_state = PowerState::On;
66        Ok(())
67    }
68
69    /// Performs the shutdown operation.
70    fn shutdown(&mut self) -> Result<(), BusError> {
71        self.power_state = PowerState::Off;
72        Ok(())
73    }
74
75    /// Reads reg.
76    fn read_reg(&self, offset: usize) -> Result<u32, BusError> {
77        if !self.regs.is_valid() {
78            return Err(BusError::InitFailed);
79        }
80        Ok(self.regs.read32(offset))
81    }
82
83    /// Writes reg.
84    fn write_reg(&mut self, offset: usize, value: u32) -> Result<(), BusError> {
85        if !self.regs.is_valid() {
86            return Err(BusError::InitFailed);
87        }
88        self.regs.write32(offset, value);
89        Ok(())
90    }
91
92    /// Performs the children operation.
93    fn children(&self) -> Vec<BusChild> {
94        self.children.clone()
95    }
96}
strat9_bus_drivers/omap_ocp2scp.rs

strat9_bus_drivers/
omap_ocp2scp.rs
