__ssp_enable_txwm(9)

💅 NAME 💅

okay so bestie, this page is __ssp_enable_txwm(9) from the Kernel API Manual — and it does exactly what it says on the tin: enable transmit watermark interrupts. no cap, periodt. 💖

✨ SYNOPSIS ✨

void __ssp_enable_txwm (struct sifive_serial_port *ssp );

🎀 ARGUMENTS 🎀

• ssp — pointer to a struct sifive_serial_port. that's it, that's the whole argument. 🫶

🦋 DESCRIPTION 🦋

this one is lowkey iconic: it enables interrupt generation when the transmit FIFO watermark is reached on the SiFive UART referred to by ssp. it's giving “turn on the watermark interrupt” energy, fr fr. ✨

🌈 SEE ALSO 🌈

the whole friend group is here, bestie:

• Kernel file ./drivers/tty/serial/sifive.c
• struct sifive_serial_port(9)
• __ssp_early_writel(9)
• __ssp_early_readl(9)
• __ssp_writel(9)
• __ssp_readl(9)
• sifive_serial_is_txfifo_full(9)
• __ssp_transmit_char(9)
• __ssp_transmit_chars(9)
• __ssp_enable_rxwm(9)
• __ssp_disable_txwm(9)
• __ssp_disable_rxwm(9)
• __ssp_receive_char(9)
• __ssp_receive_chars(9)
• __ssp_update_div(9)
• __ssp_update_baud_rate(9)
• __ssp_set_stop_bits(9)
• __ssp_wait_for_xmitr(9)
• sifive_serial_clk_notifier(9)

cute lil sign-off: source ./drivers/tty/serial, dated October 2026, from the Kernel API Manual — mwah, slay, bye bestie 💋💅