STRUCT MMP_PDMA_OPS(9)

🌸 struct mmp_pdma_ops(9) 🌸

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct mmp_pdma_ops, and it's basically the ops table for the MMP PDMA controller. it's giving "here's all the function pointers and config bits you need" energy, and honestly? iconic of it. 💅

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💖 NAME 💖

struct mmp_pdma_ops — the Operations for the MMP PDMA controller 🫶

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✨ SYNOPSIS ✨

struct mmp_pdma_ops {
    void (*write_next_addr)(struct mmp_pdma_phy *phy, dma_addr_t addr);
    u64 (*read_src_addr)(struct mmp_pdma_phy *phy);
    u64 (*read_dst_addr)(struct mmp_pdma_phy *phy);
    void (*set_desc_next_addr)(struct mmp_pdma_desc_hw *desc, dma_addr_t
addr);
    void (*set_desc_src_addr)(struct mmp_pdma_desc_hw *desc, dma_addr_t
addr);
    void (*set_desc_dst_addr)(struct mmp_pdma_desc_hw *desc, dma_addr_t
addr);
    u64 (*get_desc_src_addr)(const struct mmp_pdma_desc_hw *desc);
    u64 (*get_desc_dst_addr)(const struct mmp_pdma_desc_hw *desc);
    u32 run_bits;
    u32 dma_width;
    u32 drcmr_ext_base;
 };

like, look at all those function pointers. so organized. we love a struct that knows what it wants 💜

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🎀 Members 🎀

okay so here's the whole cast, member by member, no cap:

• write_next_addr — the function that programs the address of the next descriptor into DDADR/DDADRH 🔥
• read_src_addr — the function that reads the source address from DSADR/DSADRH
• read_dst_addr — the function that reads the destination address from DTADR/DTADRH
• set_desc_next_addr — the function that sets the next descriptor address in the descriptor
• set_desc_src_addr — the function that sets the source address in the descriptor
• set_desc_dst_addr — the function that sets the destination address in the descriptor
• get_desc_src_addr — the function that gets the source address from the descriptor
• get_desc_dst_addr — the function that gets the destination address from the descriptor
• run_bits — the control bits in the DCSR register for channel start/stop 👑
• dma_width — the DMA addressing width in bits (32 or 64). this one determines the DMA mask capability of the controller hardware — important, bestie, don't sleep on it 🌈
• drcmr_ext_base — the base DRCMR address for extended requests 🦋

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💫 Description 💫

so the page groups things into three little vibes:

Hardware Register Operations (read/write hardware registers):

Descriptor Memory Operations (manipulate descriptor structs in memory):

Controller Configuration:

like yes, those are the three lanes this struct runs in. 🧚

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🔍 SEE ALSO 🔍

• Kernel file ./drivers/dma/mmp_pdma.c

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and that's the whole page, bestie, you ate it 💖 if you ever need to find it again it lives in ./drivers/dma, dated October 2026, and honestly the version is right there with it — fr fr, go read the source, it's literally one file down. 🍓