STRUCT DW_EDMA_CHIP(9)

💖 NAME 💖

so like, you're reading struct dw_edma_chip(9) from the Kernel API Manual, and bestie, it's literally the representation of DesignWare eDMA controller hardware ✨ that's the whole vibe

🦋 SYNOPSIS 🦋

struct dw_edma_chip {
    struct device           *dev;
    int nr_irqs;
    const struct dw_edma_plat_ops   *ops;
    u32 flags;
    void __iomem            *reg_base;
    u16 ll_wr_cnt;
    u16 ll_rd_cnt;
    struct dw_edma_region   ll_region_wr[HDMA_MAX_WR_CH];
    struct dw_edma_region   ll_region_rd[HDMA_MAX_RD_CH];
    struct dw_edma_region   dt_region_wr[HDMA_MAX_WR_CH];
    struct dw_edma_region   dt_region_rd[HDMA_MAX_RD_CH];
    int db_irq;
    resource_size_t db_offset;
    enum dw_edma_map_format mf;
    u8 func_no;
    struct dw_edma          *dw;
    bool cfg_non_ll;
};

🎀 Members 🎀

okay so let's go member by member, no skips, we're doing the whole list periodt 💅

• dev — the struct device of the eDMA controller 🫶
• nr_irqs — total number of DMA IRQs, like the whole squad count
• ops — the DMA channel to IRQ number mapping, i.e. who goes with which IRQ
• flags — the dw_edma_chip_flags situation 🌸
• reg_base — DMA register base address, the home address of the registers
• ll_wr_cnt — DMA write link list count ✍️
• ll_rd_cnt — DMA read link list count 📖
• ll_region_wr — DMA descriptor link list memory for the write channel 🧚
• ll_region_rd — DMA descriptor link list memory for the read channel
• dt_region_wr — DMA data memory for the write channel 🌈
• dt_region_rd — DMA data memory for the read channel
• db_irq — Virtual IRQ dedicated to interrupt emulation, she's virtual, she's special ⭐
• db_offset — offset from the DMA register base
• mf — DMA register map format
• func_no — PCI endpoint function number used by DMA TLPs 🔥
• dw — the struct dw_edma that gets filled by dw_edma_probe, the main character fr fr

ngl, you'll also spot cfg_non_ll sitting up there in the struct 🫣 — the Members list above is exactly what the page gives us, so we're not out here making stuff up about it 💀

⭐ SEE ALSO ⭐

• Kernel file ./include/linux/dma/edma.h
• struct dw_edma_plat_ops(9)
• enum dw_edma_chip_flags(9)
• enum dw_edma_ch_irq_mode(9)

go read those next, iykyk 👑

and that's the whole page bestie 💖 this one came from ./include/linux/dma, dated October 2026, and it's the struct dw_edma_chip(9) footer signing off — slay, ate, no cap 🎀✨