__ssp_enable_rxwm(9)

okay bestie, welcome to __ssp_enable_rxwm(9) from the Kernel API Manual — yes, we are deep in SiFive UART receive-watermark interrupt lore, and it is lowkey iconic 🦋✨

🎀 NAME 🎀

• __ssp_enable_rxwm — enable receive watermark interrupts 💖

🌸 SYNOPSIS 🌸

void __ssp_enable_rxwm (struct sifive_serial_port *ssp );

💅 ARGUMENTS 💅

• ssp — pointer to a struct sifive_serial_port, aka the SiFive serial port buddy you're handing over 🫶

✨ DESCRIPTION ✨

okay so here's the tea: this enables interrupt generation when the receive FIFO watermark is reached on the SiFive UART referred to by ssp. That's it, that's the flex — receive FIFO watermark reached, interrupt generation enabled, slay 💅🔥

🔥 SEE ALSO 🔥

like obviously go peek at these too, bestie:

• Kernel file ./drivers/tty/serial/sifive.c — the source file in question, iykyk
• 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_txwm(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)

and that's the whole page, bestie 🫶 source/version ./drivers/tty/serial, dated October 2026 — footer tea delivered, periodt 💋🌈