STRUCT SH_DMAE_PDATA(9)

✨ struct sh_dmae_pdata(9) ✨

okay bestie, welcome to the Kernel API Manual entry for struct sh_dmae_pdata — literally the DMAC platform data struct and she is carrying a lot of fields 💅

🌸 NAME 🌸

struct sh_dmae_pdata — DMAC platform data 🎀

🦋 SYNOPSIS 🦋

struct sh_dmae_pdata {
    const struct sh_dmae_slave_config *slave;
    int slave_num;
    const struct sh_dmae_channel *channel;
    int channel_num;
    unsigned int ts_low_shift;
    unsigned int ts_low_mask;
    unsigned int ts_high_shift;
    unsigned int ts_high_mask;
    const unsigned int *ts_shift;
    int ts_shift_num;
    u16 dmaor_init;
    unsigned int chcr_offset;
    u32 chcr_ie_bit;
    unsigned int dmaor_is_32bit:1;
    unsigned int needs_tend_set:1;
    unsigned int no_dmars:1;
    unsigned int chclr_present:1;
    unsigned int chclr_bitwise:1;
    unsigned int slave_only:1;
};

look at her. all those bitfields at the bottom? that's main character energy fr fr 👑

💖 Members 💖

time for the vibe check on every single one of these, no skipping, we're doing the whole roster 🫶

• slave — array of slaves ✨
• slave_num — how many slaves are in that array up there (slave), that's the count 💫
• channel — array of DMA channels 🌈
• channel_num — the number of channels chillin' in the channel array ⭐
• ts_low_shift — the shift of the low part of the TS field 🎀
• ts_low_mask — low TS field mask 🌸
• ts_high_shift — an additional shift of the high part of the TS field (yes, "additional", it said what it said) 💅
• ts_high_mask — high TS field mask 🦋
• ts_shift — array of Transfer Size shifts, indexed by TS value 📚
• ts_shift_num — the number of shifts in the ts_shift array above 👆
• dmaor_init — DMAOR initialisation value 🔥
• chcr_offset — CHCR address offset 🎯
• chcr_ie_bit — CHCR Interrupt Enable bit ⚡
• dmaor_is_32bit — tells you DMAOR is a 32-bit register 🧮
• needs_tend_set — the TEND register has to be set, like it's mandatory, no cap 😤
• no_dmars — DMAC has no DMARS registers 🚫
• chclr_present — DMAC has one or several CHCLR registers 👀
• chclr_bitwise — the channel CHCLR registers are bitwise 🔢
• slave_only — DMAC cannot be used for MEMCPY, that's the rule bestie 💀

👑 SEE ALSO 👑

• Kernel file ./include/linux/sh_dma.h
• struct sh_dmae_channel(9)

and that's the whole page! shipped straight outta ./include/linux, dated October 2026, from your girl the Kernel API Manual — slay, go read sh_dma.h next, ily 🫶💜🧚