STRUCT PL08X_PHY_CHAN(9)

✨ struct pl08x_phy_chan(9) ✨

okay bestie, buckle up 💅 this is a page from the Kernel API Manual and it's literally about a struct that holds the physical channels — like, the actual hardware channels, not the fake virtual ones. main character energy fr fr 🎀

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🌸 NAME 🌸

struct pl08x_phy_chan — the holder for the physical channels 💖

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✨ SYNOPSIS ✨

no cap, here's the whole thing, character for character:

struct pl08x_phy_chan {
    unsigned int id;
    void __iomem *base;
    void __iomem *reg_config;
    void __iomem *reg_control;
    void __iomem *reg_src;
    void __iomem *reg_dst;
    void __iomem *reg_lli;
    void __iomem *reg_busy;
    spinlock_t lock;
    struct pl08x_dma_chan *serving;
    bool locked;
    bool ftdmac020;
    bool pl080s;
 };

like... she's got a LOT going on and honestly? iconic of her 🫶

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💜 Members 💜

okay so let's go through every single one because we are NOT skipping anything, bestie:

• id — the physical index to this channel 🔢 like her little ID card
• base — the memory base address for this physical channel 📍 home address vibes
• reg_config — the configuration address for this physical channel ⚙️
• reg_control — the control address for this physical channel 🎛️
• reg_src — the transfer source address register 📤 where the tea comes from
• reg_dst — the transfer destination address register 📥 where it's going
• reg_lli — the transfer LLI address register 🔗 (LLI my beloved)
• reg_busy — if the variant has a special per-channel busy register, this contains a pointer to it 👀 note the "if" — not every variant has one, so don't assume, bestie
• lock — a lock to use when altering an instance of this struct 🔒 pls respect the lock, she's not decorative
• serving — the virtual channel currently being served by this physical channel 💁‍♀️ she's literally in service
• locked — the channel is unavailable for the system, e.g. dedicated to secure world 🚫 like sorry, she's booked, and also kind of a security thing
• ftdmac020 — the channel is on a FTDMAC020 🧚
• pl080s — the channel is on a PL08s ⭐

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🦋 SEE ALSO 🦋

go read these next, iykyk:

• Kernel file ./drivers/dma/amba-pl08x.c
• struct vendor_data(9)
• struct pl08x_bus_data(9)
• struct pl08x_sg(9)
• struct pl08x_txd(9)
• enum pl08x_dma_chan_state(9)
• struct pl08x_dma_chan(9)
• struct pl08x_driver_data(9)

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aaaand that's the whole thing, no crumbs left 💀💖 this came from ./drivers/dma, dated October 2026, and the page itself is struct pl08x_phy_chan(9) — go off, you now officially understand physical channels better than half the group chat 🌈👑