__ssp_receive_chars(9)

💖 __ssp_receive_chars(9) 💖

okay so this is a page from the Kernel API Manual bestie, and it's literally all about snatching bytes off the UART. let's get into it 🫶

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✨ NAME ✨

__ssp_receive_chars — receive multiple bytes from the UART. yes, plural, she's not doing one-at-a-time energy 💅

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🌸 SYNOPSIS 🌸

void __ssp_receive_chars (struct sifive_serial_port *ssp );

that's it. that's the whole vibe. void return, one arg, no notes 💜

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🎀 ARGUMENTS 🎀

• ssp — pointer to a struct sifive_serial_port. like, that's the whole thing. she just wants her struct, okay? 🦋

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⭐ DESCRIPTION ⭐

so here's the tea fr fr: this function receives up to an RX FIFO's worth of bytes from the SiFive UART that ssp is referring to, and then passes them up to the Linux serial layer. 🧚

"up to an RX FIFO's worth" is the key phrase — not more, not less, just what the FIFO's giving. she's doing exactly as much work as the hardware allows and then handing it off. iconic behavior honestly 👑

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🔥 CONTEXT 🔥

expects ssp->port.lock to be held by the caller. like, you hold the lock, bestie, not her. she is NOT acquiring it for you. if you forgot, that's a you problem 😭

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🌈 SEE ALSO 🌈

okay this list is LONG and honestly kind of a squad 💀 let's go:

• kernel file ./drivers/tty/serial/sifive.c and 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_enable_rxwm(9)
• __ssp_disable_txwm(9)
• __ssp_disable_rxwm(9)
• __ssp_receive_char(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)

like, go read those too, they're all part of the same little friend group 🤝

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and that's the whole page!! this lil icon comes from ./drivers/tty/serial, dated October 2026, and the manual name is __ssp_receive_chars(9) — so if you ever need to remember where you read this, it's right there in the corner bestie 🎀✨💖