STRUCT AT_DMA(9)

🦋 struct at_dma 🦋

okay bestie, this is the struct at_dma(9) page from the Kernel API Manual, and it's literally about the internal representation of an Atmel HDMA Controller. no cap, this is the kernel-internal struct vibe. 💅

✨ NAME ✨

struct at_dma — internal representation of an Atmel HDMA Controller. periodt, that's the whole name-and-purpose combo. 💖

🌸 SYNOPSIS 🌸

here's the exact shape, character for character:

struct at_dma {
    struct dma_device       dma_device;
    void __iomem            *regs;
    struct clk              *clk;
    u32 save_imr;
    u8 all_chan_mask;
    struct dma_pool         *lli_pool;
    struct dma_pool         *memset_pool;
    struct at_dma_chan      chan[];
};

🫶 Members 🫶

• dma_device — the dmaengine dma_device object members. 💖
• regs — memory mapped register base. 📍
• clk — dma controller clock. ⏰
• save_imr — interrupt mask register that is saved on suspend/resume cycle. 😴
• all_chan_mask — all channels available in a mask. 🎭
• lli_pool — hw lli table. 🧾
• memset_pool — hw memset pool. 🫧
• chan — channels table to store at_dma_chan structures. 🗂️

🌈 SEE ALSO 🌈

the kernel file is ./drivers/dma/at_hdmac.c, and the related reference squad is:

• struct atdma_sg(9)
• struct at_desc(9)
• enum atc_status(9)
• struct at_dma_chan(9)
• atc_chan_is_enabled(9)
• atc_chan_is_paused(9)
• atc_chan_is_cyclic(9)
• set_lli_eol(9)
• struct at_dma_platform_data(9)
• struct at_dma_slave(9)
• atc_dostart(9)
• atc_calc_bytes_left(9)
• atc_get_llis_residue(9)
• atc_get_residue(9)
• atc_handle_error(9)
• atc_prep_dma_interleaved(9)
• atc_prep_dma_memcpy(9)
• atc_prep_dma_memset(9)
• atc_prep_slave_sg(9)
• atc_prep_dma_cyclic(9)
• atc_tx_status(9)
• atc_alloc_chan_resources(9)
• atc_free_chan_resources(9)
• at_dma_off(9)

kisses bestie, this page came from source ./drivers/dma, version struct at_dma(9), dated October 2026. byeee 🎀💜