it821x_program(9)

🌸 NAME — it821x_program(9) 🌸

Okay so bestie, this is the manual page for it821x_program(9) from the Kernel API Manual. It’s giving “program the PIO/MWDMA registers” — that’s the whole name, no cap. 💅

✨ SYNOPSIS ✨

The signature, exactly as it appears, because we do not mess with code:

void it821x_program (struct ata_port *ap , struct ata_device *adev , u16
       timing );

🎀 ARGUMENTS 🎀

• ap — ATA port. That’s it, that’s the whole vibe.
• adev — Device to program. The one getting the timing glow-up.
• timing — Timing value (66Mhz in top 8bits, 50 in the low 8). Yes, that’s the literal breakdown — top bits, low bits, iconic. 🫶

💖 DESCRIPTION 💖

So what’s the tea? it821x_program programs the PIO/MWDMA timing for this channel according to the current clock. These share the same register, so they’re managed by the DMA start/stop sequence as with the old driver. That’s it — no extra lore, just timing business. ✨

🌈 SEE ALSO 🌈

Kernel file: ./drivers/ata/pata_it821x.c. The whole squad, in order:

• it821x_program_udma(9)
• it821x_clock_strategy(9)
• it821x_passthru_set_piomode(9)
• it821x_passthru_set_dmamode(9)
• it821x_passthru_bmdma_start(9)
• it821x_passthru_bmdma_stop(9)
• it821x_passthru_dev_select(9)
• it821x_smart_qc_issue(9)
• it821x_passthru_qc_issue(9)
• it821x_smart_set_mode(9)
• it821x_dev_config(9)
• it821x_read_id(9)
• it821x_check_atapi_dma(9)
• it821x_display_disk(9)
• it821x_firmware_command(9)
• it821x_probe_firmware(9)
• it821x_port_start(9)
• it821x_rdc_cable(9)

xoxo, your kernel bestie 💅 — source/version: ./drivers/ata, date: October 2026. it821x_program(9) out. 🫶