hpt3x3_set_dmamode(9)

💅 hpt3x3_set_dmamode — DMA timing setup

okay so bestie, this is hpt3x3_set_dmamode(9) from the Kernel API Manual, section 9, and it's literally the little function that gets your HPT3x3 channel ready for the fast stuff. let's go 💖

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✨ SYNOPSIS ✨

void hpt3x3_set_dmamode (struct ata_port *ap , struct ata_device *adev
);

that's it. two args, no return value (it's void, she doesn't give anything back, she just does 💅).

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🫶 ARGUMENTS 🫶

• ap — the ATA interface. like, the port itself, the whole vibe of the channel 🌸
• adev — the device being configured. the one actually getting its timing set up, main character energy 👑

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🎀 DESCRIPTION 🎀

so what does she actually do? she sets up the channel for MWDMA or UDMA modes. no cap.

and it's much the same as with PIO — you load the mode number in, and then you set the MWDMA or UDMA flag. same little ritual, different mode 🕯️✨

here are the registers you gotta know about, and yes you need both of these memorized bestie:

• 0x44 — bit 0-2 master mode, 3-5 slave mode, etc
• 0x48 — bit 4/0 DMA/UDMA, bit 5/1 for slave etc

🚨 bit math is serious business here — 0x44 is holding the mode bits for master and slave, and 0x48 is where the DMA/UDMA flag lives. read the bit positions carefully, don't just vibe your way through it fr fr 😭

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🦋 SEE ALSO 🦋

the kernel file for this one lives at ./drivers/ata/pata_hpt3x3.c, and honestly the whole friend group is worth a read:

• hpt3x3_set_piomode(9)
• hpt3x3_freeze(9)
• hpt3x3_bmdma_setup(9)
• hpt3x3_atapi_dma(9)
• hpt3x3_init_chipset(9)
• hpt3x3_init_one(9)

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okay that's the whole page, go forth and configure your DMA modes responsibly 🧚💜 this has been the hpt3x3_set_dmamode(9) entry, coming to you from ./drivers/ata, dated October 2026, part of the Kernel API Manual — slay, bye 🎀🔥