Lines Matching refs:ssp
236 static void __ssp_writel(u32 v, u16 offs, struct sifive_serial_port *ssp) in __ssp_writel() argument
238 __ssp_early_writel(v, offs, &ssp->port); in __ssp_writel()
253 static u32 __ssp_readl(struct sifive_serial_port *ssp, u16 offs) in __ssp_readl() argument
255 return __ssp_early_readl(&ssp->port, offs); in __ssp_readl()
269 static int sifive_serial_is_txfifo_full(struct sifive_serial_port *ssp) in sifive_serial_is_txfifo_full() argument
271 return __ssp_readl(ssp, SIFIVE_SERIAL_TXDATA_OFFS) & in sifive_serial_is_txfifo_full()
286 static void __ssp_transmit_char(struct sifive_serial_port *ssp, int ch) in __ssp_transmit_char() argument
288 __ssp_writel(ch, SIFIVE_SERIAL_TXDATA_OFFS, ssp); in __ssp_transmit_char()
300 static void __ssp_transmit_chars(struct sifive_serial_port *ssp) in __ssp_transmit_chars() argument
302 struct circ_buf *xmit = &ssp->port.state->xmit; in __ssp_transmit_chars()
305 if (ssp->port.x_char) { in __ssp_transmit_chars()
306 __ssp_transmit_char(ssp, ssp->port.x_char); in __ssp_transmit_chars()
307 ssp->port.icount.tx++; in __ssp_transmit_chars()
308 ssp->port.x_char = 0; in __ssp_transmit_chars()
311 if (uart_circ_empty(xmit) || uart_tx_stopped(&ssp->port)) { in __ssp_transmit_chars()
312 sifive_serial_stop_tx(&ssp->port); in __ssp_transmit_chars()
317 __ssp_transmit_char(ssp, xmit->buf[xmit->tail]); in __ssp_transmit_chars()
319 ssp->port.icount.tx++; in __ssp_transmit_chars()
325 uart_write_wakeup(&ssp->port); in __ssp_transmit_chars()
328 sifive_serial_stop_tx(&ssp->port); in __ssp_transmit_chars()
338 static void __ssp_enable_txwm(struct sifive_serial_port *ssp) in __ssp_enable_txwm() argument
340 if (ssp->ier & SIFIVE_SERIAL_IE_TXWM_MASK) in __ssp_enable_txwm()
343 ssp->ier |= SIFIVE_SERIAL_IE_TXWM_MASK; in __ssp_enable_txwm()
344 __ssp_writel(ssp->ier, SIFIVE_SERIAL_IE_OFFS, ssp); in __ssp_enable_txwm()
354 static void __ssp_enable_rxwm(struct sifive_serial_port *ssp) in __ssp_enable_rxwm() argument
356 if (ssp->ier & SIFIVE_SERIAL_IE_RXWM_MASK) in __ssp_enable_rxwm()
359 ssp->ier |= SIFIVE_SERIAL_IE_RXWM_MASK; in __ssp_enable_rxwm()
360 __ssp_writel(ssp->ier, SIFIVE_SERIAL_IE_OFFS, ssp); in __ssp_enable_rxwm()
370 static void __ssp_disable_txwm(struct sifive_serial_port *ssp) in __ssp_disable_txwm() argument
372 if (!(ssp->ier & SIFIVE_SERIAL_IE_TXWM_MASK)) in __ssp_disable_txwm()
375 ssp->ier &= ~SIFIVE_SERIAL_IE_TXWM_MASK; in __ssp_disable_txwm()
376 __ssp_writel(ssp->ier, SIFIVE_SERIAL_IE_OFFS, ssp); in __ssp_disable_txwm()
386 static void __ssp_disable_rxwm(struct sifive_serial_port *ssp) in __ssp_disable_rxwm() argument
388 if (!(ssp->ier & SIFIVE_SERIAL_IE_RXWM_MASK)) in __ssp_disable_rxwm()
391 ssp->ier &= ~SIFIVE_SERIAL_IE_RXWM_MASK; in __ssp_disable_rxwm()
392 __ssp_writel(ssp->ier, SIFIVE_SERIAL_IE_OFFS, ssp); in __ssp_disable_rxwm()
407 static char __ssp_receive_char(struct sifive_serial_port *ssp, char *is_empty) in __ssp_receive_char() argument
412 v = __ssp_readl(ssp, SIFIVE_SERIAL_RXDATA_OFFS); in __ssp_receive_char()
435 static void __ssp_receive_chars(struct sifive_serial_port *ssp) in __ssp_receive_chars() argument
442 ch = __ssp_receive_char(ssp, &is_empty); in __ssp_receive_chars()
446 ssp->port.icount.rx++; in __ssp_receive_chars()
447 uart_insert_char(&ssp->port, 0, 0, ch, TTY_NORMAL); in __ssp_receive_chars()
450 spin_unlock(&ssp->port.lock); in __ssp_receive_chars()
451 tty_flip_buffer_push(&ssp->port.state->port); in __ssp_receive_chars()
452 spin_lock(&ssp->port.lock); in __ssp_receive_chars()
463 static void __ssp_update_div(struct sifive_serial_port *ssp) in __ssp_update_div() argument
467 div = DIV_ROUND_UP(ssp->clkin_rate, ssp->baud_rate) - 1; in __ssp_update_div()
469 __ssp_writel(div, SIFIVE_SERIAL_DIV_OFFS, ssp); in __ssp_update_div()
482 static void __ssp_update_baud_rate(struct sifive_serial_port *ssp, in __ssp_update_baud_rate() argument
485 if (ssp->baud_rate == rate) in __ssp_update_baud_rate()
488 ssp->baud_rate = rate; in __ssp_update_baud_rate()
489 __ssp_update_div(ssp); in __ssp_update_baud_rate()
499 static void __ssp_set_stop_bits(struct sifive_serial_port *ssp, char nstop) in __ssp_set_stop_bits() argument
508 v = __ssp_readl(ssp, SIFIVE_SERIAL_TXCTRL_OFFS); in __ssp_set_stop_bits()
511 __ssp_writel(v, SIFIVE_SERIAL_TXCTRL_OFFS, ssp); in __ssp_set_stop_bits()
522 static void __maybe_unused __ssp_wait_for_xmitr(struct sifive_serial_port *ssp) in __ssp_wait_for_xmitr() argument
524 while (sifive_serial_is_txfifo_full(ssp)) in __ssp_wait_for_xmitr()
534 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_stop_tx() local
536 __ssp_disable_txwm(ssp); in sifive_serial_stop_tx()
541 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_stop_rx() local
543 __ssp_disable_rxwm(ssp); in sifive_serial_stop_rx()
548 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_start_tx() local
550 __ssp_enable_txwm(ssp); in sifive_serial_start_tx()
555 struct sifive_serial_port *ssp = dev_id; in sifive_serial_irq() local
558 spin_lock(&ssp->port.lock); in sifive_serial_irq()
560 ip = __ssp_readl(ssp, SIFIVE_SERIAL_IP_OFFS); in sifive_serial_irq()
562 spin_unlock(&ssp->port.lock); in sifive_serial_irq()
567 __ssp_receive_chars(ssp); in sifive_serial_irq()
569 __ssp_transmit_chars(ssp); in sifive_serial_irq()
571 spin_unlock(&ssp->port.lock); in sifive_serial_irq()
598 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_startup() local
600 __ssp_enable_rxwm(ssp); in sifive_serial_startup()
607 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_shutdown() local
609 __ssp_disable_rxwm(ssp); in sifive_serial_shutdown()
610 __ssp_disable_txwm(ssp); in sifive_serial_shutdown()
630 struct sifive_serial_port *ssp = notifier_to_sifive_serial_port(nb); in sifive_serial_clk_notifier() local
639 __ssp_wait_for_xmitr(ssp); in sifive_serial_clk_notifier()
649 udelay(DIV_ROUND_UP(12 * 1000 * 1000, ssp->baud_rate)); in sifive_serial_clk_notifier()
652 if (event == POST_RATE_CHANGE && ssp->clkin_rate != cnd->new_rate) { in sifive_serial_clk_notifier()
653 ssp->clkin_rate = cnd->new_rate; in sifive_serial_clk_notifier()
654 __ssp_update_div(ssp); in sifive_serial_clk_notifier()
664 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_set_termios() local
671 dev_err_once(ssp->port.dev, "only 8-bit words supported\n"); in sifive_serial_set_termios()
676 dev_err_once(ssp->port.dev, "parity checking not supported\n"); in sifive_serial_set_termios()
678 dev_err_once(ssp->port.dev, "BREAK detection not supported\n"); in sifive_serial_set_termios()
683 __ssp_set_stop_bits(ssp, nstop); in sifive_serial_set_termios()
686 rate = uart_get_baud_rate(port, termios, old, 0, ssp->clkin_rate / 16); in sifive_serial_set_termios()
687 __ssp_update_baud_rate(ssp, rate); in sifive_serial_set_termios()
689 spin_lock_irqsave(&ssp->port.lock, flags); in sifive_serial_set_termios()
694 ssp->port.read_status_mask = 0; in sifive_serial_set_termios()
697 v = __ssp_readl(ssp, SIFIVE_SERIAL_RXCTRL_OFFS); in sifive_serial_set_termios()
704 __ssp_writel(v, SIFIVE_SERIAL_RXCTRL_OFFS, ssp); in sifive_serial_set_termios()
706 spin_unlock_irqrestore(&ssp->port.lock, flags); in sifive_serial_set_termios()
720 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_config_port() local
722 ssp->port.type = PORT_SIFIVE_V0; in sifive_serial_config_port()
739 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_poll_get_char() local
742 ch = __ssp_receive_char(ssp, &is_empty); in sifive_serial_poll_get_char()
752 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_poll_put_char() local
754 __ssp_wait_for_xmitr(ssp); in sifive_serial_poll_put_char()
755 __ssp_transmit_char(ssp, c); in sifive_serial_poll_put_char()
810 struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); in sifive_serial_console_putchar() local
812 __ssp_wait_for_xmitr(ssp); in sifive_serial_console_putchar()
813 __ssp_transmit_char(ssp, ch); in sifive_serial_console_putchar()
819 struct sifive_serial_port *ssp = sifive_serial_console_ports[co->index]; in sifive_serial_console_write() local
824 if (!ssp) in sifive_serial_console_write()
828 if (ssp->port.sysrq) in sifive_serial_console_write()
831 locked = spin_trylock(&ssp->port.lock); in sifive_serial_console_write()
833 spin_lock(&ssp->port.lock); in sifive_serial_console_write()
835 ier = __ssp_readl(ssp, SIFIVE_SERIAL_IE_OFFS); in sifive_serial_console_write()
836 __ssp_writel(0, SIFIVE_SERIAL_IE_OFFS, ssp); in sifive_serial_console_write()
838 uart_console_write(&ssp->port, s, count, sifive_serial_console_putchar); in sifive_serial_console_write()
840 __ssp_writel(ier, SIFIVE_SERIAL_IE_OFFS, ssp); in sifive_serial_console_write()
843 spin_unlock(&ssp->port.lock); in sifive_serial_console_write()
849 struct sifive_serial_port *ssp; in sifive_serial_console_setup() local
858 ssp = sifive_serial_console_ports[co->index]; in sifive_serial_console_setup()
859 if (!ssp) in sifive_serial_console_setup()
865 return uart_set_options(&ssp->port, co, baud, parity, bits, flow); in sifive_serial_console_setup()
888 static void __ssp_add_console_port(struct sifive_serial_port *ssp) in __ssp_add_console_port() argument
890 sifive_serial_console_ports[ssp->port.line] = ssp; in __ssp_add_console_port()
893 static void __ssp_remove_console_port(struct sifive_serial_port *ssp) in __ssp_remove_console_port() argument
895 sifive_serial_console_ports[ssp->port.line] = 0; in __ssp_remove_console_port()
904 static void __ssp_add_console_port(struct sifive_serial_port *ssp) in __ssp_add_console_port() argument
906 static void __ssp_remove_console_port(struct sifive_serial_port *ssp) in __ssp_remove_console_port() argument
943 struct sifive_serial_port *ssp; in sifive_serial_probe() local
979 ssp = devm_kzalloc(&pdev->dev, sizeof(*ssp), GFP_KERNEL); in sifive_serial_probe()
980 if (!ssp) in sifive_serial_probe()
983 ssp->port.dev = &pdev->dev; in sifive_serial_probe()
984 ssp->port.type = PORT_SIFIVE_V0; in sifive_serial_probe()
985 ssp->port.iotype = UPIO_MEM; in sifive_serial_probe()
986 ssp->port.irq = irq; in sifive_serial_probe()
987 ssp->port.fifosize = SIFIVE_TX_FIFO_DEPTH; in sifive_serial_probe()
988 ssp->port.ops = &sifive_serial_uops; in sifive_serial_probe()
989 ssp->port.line = id; in sifive_serial_probe()
990 ssp->port.mapbase = mem->start; in sifive_serial_probe()
991 ssp->port.membase = base; in sifive_serial_probe()
992 ssp->dev = &pdev->dev; in sifive_serial_probe()
993 ssp->clk = clk; in sifive_serial_probe()
994 ssp->clk_notifier.notifier_call = sifive_serial_clk_notifier; in sifive_serial_probe()
996 r = clk_notifier_register(ssp->clk, &ssp->clk_notifier); in sifive_serial_probe()
1004 ssp->clkin_rate = clk_get_rate(ssp->clk); in sifive_serial_probe()
1005 ssp->baud_rate = SIFIVE_DEFAULT_BAUD_RATE; in sifive_serial_probe()
1006 ssp->port.uartclk = ssp->clkin_rate; in sifive_serial_probe()
1007 __ssp_update_div(ssp); in sifive_serial_probe()
1009 platform_set_drvdata(pdev, ssp); in sifive_serial_probe()
1014 SIFIVE_SERIAL_TXCTRL_OFFS, ssp); in sifive_serial_probe()
1019 SIFIVE_SERIAL_RXCTRL_OFFS, ssp); in sifive_serial_probe()
1021 r = request_irq(ssp->port.irq, sifive_serial_irq, ssp->port.irqflags, in sifive_serial_probe()
1022 dev_name(&pdev->dev), ssp); in sifive_serial_probe()
1028 __ssp_add_console_port(ssp); in sifive_serial_probe()
1030 r = uart_add_one_port(&sifive_serial_uart_driver, &ssp->port); in sifive_serial_probe()
1039 __ssp_remove_console_port(ssp); in sifive_serial_probe()
1040 free_irq(ssp->port.irq, ssp); in sifive_serial_probe()
1042 clk_notifier_unregister(ssp->clk, &ssp->clk_notifier); in sifive_serial_probe()
1049 struct sifive_serial_port *ssp = platform_get_drvdata(dev); in sifive_serial_remove() local
1051 __ssp_remove_console_port(ssp); in sifive_serial_remove()
1052 uart_remove_one_port(&sifive_serial_uart_driver, &ssp->port); in sifive_serial_remove()
1053 free_irq(ssp->port.irq, ssp); in sifive_serial_remove()
1054 clk_notifier_unregister(ssp->clk, &ssp->clk_notifier); in sifive_serial_remove()