The branch main has been updated by kevans:
URL:
https://cgit.FreeBSD.org/src/commit/?id=ba2336d3044c681462224c12879ecc8f659be54a
commit ba2336d3044c681462224c12879ecc8f659be54a
Author: Kyle Evans <kev...@freebsd.org>
AuthorDate: 2025-04-02 02:57:16 +0000
Commit: Kyle Evans <kev...@freebsd.org>
CommitDate: 2025-04-02 02:57:17 +0000
arm64: add a driver for the uart found on Apple Silicon machines
This is a revival of the old exynos4210 driver, with some additional
bits to configure the apple "s5l" uart (which is actually slightly
different to operate).
This hasn't been tested on anything that would hit the non-s5l path, so
banish it off to the apple/ domain until someone cares to confirm that
none of the other hardware is broken -- it may be that nobody does, but
the complexity isn't too bad: mostly the driver1 construct added to the
uart_bas that we use to avoid having a whole bunch of shims for uart
driver methods and hardcoded references to the cfg structs.
Reviewed by: andrew
Differential Revision: https://reviews.freebsd.org/D48120
---
sys/arm64/apple/exynos_uart.c | 568 ++++++++++++++++++++++++++++++++++++++++++
sys/arm64/apple/exynos_uart.h | 136 ++++++++++
sys/conf/files.arm64 | 1 +
sys/dev/uart/uart.h | 1 +
4 files changed, 706 insertions(+)
diff --git a/sys/arm64/apple/exynos_uart.c b/sys/arm64/apple/exynos_uart.c
new file mode 100644
index 000000000000..2767c338b918
--- /dev/null
+++ b/sys/arm64/apple/exynos_uart.c
@@ -0,0 +1,568 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2003 Marcel Moolenaar
+ * Copyright (c) 2007-2009 Andrew Turner
+ * Copyright (c) 2013 Ruslan Bukin <b...@bsdpad.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/cons.h>
+#include <sys/rman.h>
+#include <machine/bus.h>
+#include <machine/intr.h>
+
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_cpu.h>
+#include <dev/uart/uart_cpu_fdt.h>
+#include <dev/uart/uart_bus.h>
+
+#include <arm64/apple/exynos_uart.h>
+
+#include "uart_if.h"
+
+struct exynos_uart_cfg;
+
+#define DEF_CLK 100000000
+
+static int sscomspeed(long, long);
+static int exynos4210_uart_param(struct uart_bas *, int, int, int, int);
+
+/*
+ * Low-level UART interface.
+ */
+static int exynos4210_probe(struct uart_bas *bas);
+static void exynos4210_init_common(struct exynos_uart_cfg *cfg,
+ struct uart_bas *bas, int, int, int, int);
+static void exynos4210_init(struct uart_bas *bas, int, int, int, int);
+static void exynos4210_s5l_init(struct uart_bas *bas, int, int, int, int);
+static void exynos4210_term(struct uart_bas *bas);
+static void exynos4210_putc(struct uart_bas *bas, int);
+static int exynos4210_rxready(struct uart_bas *bas);
+static int exynos4210_getc(struct uart_bas *bas, struct mtx *mtx);
+
+extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
+
+static struct uart_ops uart_exynos4210_ops;
+static struct uart_ops uart_s5l_ops;
+static kobj_method_t exynos4210_methods[];
+static kobj_method_t s5l_methods[];
+static struct ofw_compat_data compat_data[];
+
+enum exynos_uart_type {
+ EXUART_4210,
+ EXUART_S5L,
+};
+
+struct exynos_uart_cfg {
+ enum exynos_uart_type cfg_type;
+ uint64_t cfg_uart_full_mask;
+};
+
+struct exynos_uart_class {
+ struct uart_class base;
+ struct exynos_uart_cfg cfg;
+};
+
+static struct exynos_uart_class uart_ex4210_class = {
+ .base = {
+ "exynos4210 class",
+ exynos4210_methods,
+ 1,
+ .uc_ops = &uart_exynos4210_ops,
+ .uc_range = 8,
+ .uc_rclk = 0,
+ .uc_rshift = 0
+ },
+ .cfg = {
+ .cfg_type = EXUART_4210,
+ .cfg_uart_full_mask = UFSTAT_TXFULL,
+ },
+};
+
+
+static struct exynos_uart_class uart_s5l_class = {
+ .base = {
+ "s5l class",
+ s5l_methods,
+ 1,
+ .uc_ops = &uart_s5l_ops,
+ .uc_range = 8,
+ .uc_rclk = 0,
+ .uc_rshift = 0
+ },
+ .cfg = {
+ .cfg_type = EXUART_S5L,
+ .cfg_uart_full_mask = UFSTAT_S5L_TXFULL,
+ },
+};
+
+static int
+sscomspeed(long speed, long frequency)
+{
+ int x;
+
+ if (speed <= 0 || frequency <= 0)
+ return (-1);
+ x = (frequency / 16) / speed;
+ return (x-1);
+}
+
+static int
+exynos4210_uart_param(struct uart_bas *bas, int baudrate, int databits,
+ int stopbits, int parity)
+{
+ int brd, ulcon;
+
+ ulcon = 0;
+
+ switch(databits) {
+ case 5:
+ ulcon |= ULCON_LENGTH_5;
+ break;
+ case 6:
+ ulcon |= ULCON_LENGTH_6;
+ break;
+ case 7:
+ ulcon |= ULCON_LENGTH_7;
+ break;
+ case 8:
+ ulcon |= ULCON_LENGTH_8;
+ break;
+ default:
+ return (EINVAL);
+ }
+
+ switch (parity) {
+ case UART_PARITY_NONE:
+ ulcon |= ULCON_PARITY_NONE;
+ break;
+ case UART_PARITY_ODD:
+ ulcon |= ULCON_PARITY_ODD;
+ break;
+ case UART_PARITY_EVEN:
+ ulcon |= ULCON_PARITY_EVEN;
+ break;
+ case UART_PARITY_MARK:
+ case UART_PARITY_SPACE:
+ default:
+ return (EINVAL);
+ }
+
+ if (stopbits == 2)
+ ulcon |= ULCON_STOP;
+
+ uart_setreg(bas, SSCOM_ULCON, ulcon);
+
+ /* baudrate may be negative, in which case we just leave it alone. */
+ if (baudrate > 0) {
+ brd = sscomspeed(baudrate, bas->rclk);
+ uart_setreg(bas, SSCOM_UBRDIV, brd);
+ }
+
+ return (0);
+}
+
+static struct uart_ops uart_exynos4210_ops = {
+ .probe = exynos4210_probe,
+ .init = exynos4210_init,
+ .term = exynos4210_term,
+ .putc = exynos4210_putc,
+ .rxready = exynos4210_rxready,
+ .getc = exynos4210_getc,
+};
+
+static struct uart_ops uart_s5l_ops = {
+ .probe = exynos4210_probe,
+ .init = exynos4210_s5l_init,
+ .term = exynos4210_term,
+ .putc = exynos4210_putc,
+ .rxready = exynos4210_rxready,
+ .getc = exynos4210_getc,
+};
+
+static int
+exynos4210_probe(struct uart_bas *bas)
+{
+
+ return (0);
+}
+
+static void
+exynos4210_init_common(struct exynos_uart_cfg *cfg, struct uart_bas *bas,
+ int baudrate, int databits, int stopbits, int parity)
+{
+
+ if (bas->rclk == 0)
+ bas->rclk = DEF_CLK;
+
+ KASSERT(bas->rclk != 0, ("exynos4210_init: Invalid rclk"));
+
+ bas->driver1 = cfg;
+
+ /* Clear interrupts */
+ if (cfg->cfg_type == EXUART_S5L) {
+ uart_setreg(bas, SSCOM_UTRSTAT, 0);
+ } else {
+ uart_setreg(bas, SSCOM_UCON, 0);
+ uart_setreg(bas, SSCOM_UFCON,
+ UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 |
+ UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET |
+ UFCON_FIFO_ENABLE);
+ }
+
+ exynos4210_uart_param(bas, baudrate, databits, stopbits, parity);
+
+ /* Enable UART. */
+ if (cfg->cfg_type == EXUART_S5L) {
+ uart_setreg(bas, SSCOM_UCON, uart_getreg(bas, SSCOM_UCON) |
+ UCON_TOINT | UCON_S5L_RXTHRESH | UCON_S5L_RX_TIMEOUT |
+ UCON_S5L_TXTHRESH);
+ } else {
+ uart_setreg(bas, SSCOM_UCON, uart_getreg(bas, SSCOM_UCON) |
+ UCON_TXMODE_INT | UCON_RXMODE_INT | UCON_TOINT);
+ uart_setreg(bas, SSCOM_UMCON, UMCON_RTS);
+ }
+}
+
+static void
+exynos4210_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
+ int parity)
+{
+
+ return (exynos4210_init_common(&uart_ex4210_class.cfg, bas, baudrate,
+ databits, stopbits, parity));
+}
+
+static void
+exynos4210_s5l_init(struct uart_bas *bas, int baudrate, int databits, int
stopbits,
+ int parity)
+{
+
+ return (exynos4210_init_common(&uart_s5l_class.cfg, bas, baudrate,
+ databits, stopbits, parity));
+}
+
+static void
+exynos4210_term(struct uart_bas *bas)
+{
+ /* XXX */
+}
+
+static void
+exynos4210_putc(struct uart_bas *bas, int c)
+{
+ struct exynos_uart_cfg *cfg;
+
+ cfg = bas->driver1;
+
+ while ((bus_space_read_4(bas->bst, bas->bsh, SSCOM_UFSTAT) &
+ cfg->cfg_uart_full_mask) != 0)
+ continue;
+
+ uart_setreg(bas, SSCOM_UTXH, c);
+ uart_barrier(bas);
+}
+
+static int
+exynos4210_rxready_impl(struct uart_bas *bas, bool intr)
+{
+ struct exynos_uart_cfg *cfg;
+ int ufstat, utrstat;
+
+ cfg = bas->driver1;
+ if (!intr || cfg->cfg_type != EXUART_S5L) {
+ utrstat = bus_space_read_4(bas->bst, bas->bsh, SSCOM_UTRSTAT);
+
+ if ((utrstat & UTRSTAT_RXREADY) != 0)
+ return (1);
+ if (cfg->cfg_type != EXUART_S5L)
+ return (0);
+ }
+
+ ufstat = bus_space_read_4(bas->bst, bas->bsh, SSCOM_UFSTAT);
+
+ return ((ufstat & (UFSTAT_RXCOUNT | UFSTAT_RXFULL)) != 0);
+}
+
+static int
+exynos4210_rxready(struct uart_bas *bas)
+{
+
+ return (exynos4210_rxready_impl(bas, false));
+}
+
+static int
+exynos4210_getc(struct uart_bas *bas, struct mtx *mtx)
+{
+
+ while (!exynos4210_rxready(bas)) {
+ continue;
+ }
+
+ return (uart_getreg(bas, SSCOM_URXH));
+}
+
+static int exynos4210_bus_probe(struct uart_softc *sc);
+static int exynos4210_bus_attach(struct uart_softc *sc);
+static int exynos4210_bus_flush(struct uart_softc *, int);
+static int exynos4210_bus_getsig(struct uart_softc *);
+static int exynos4210_bus_ioctl(struct uart_softc *, int, intptr_t);
+static int exynos4210_bus_ipend(struct uart_softc *);
+static int s5l_bus_ipend(struct uart_softc *);
+static int exynos4210_bus_param(struct uart_softc *, int, int, int, int);
+static int exynos4210_bus_receive(struct uart_softc *);
+static int exynos4210_bus_setsig(struct uart_softc *, int);
+static int exynos4210_bus_transmit(struct uart_softc *);
+
+static kobj_method_t exynos4210_methods[] = {
+ KOBJMETHOD(uart_probe, exynos4210_bus_probe),
+ KOBJMETHOD(uart_attach, exynos4210_bus_attach),
+ KOBJMETHOD(uart_flush, exynos4210_bus_flush),
+ KOBJMETHOD(uart_getsig, exynos4210_bus_getsig),
+ KOBJMETHOD(uart_ioctl, exynos4210_bus_ioctl),
+ KOBJMETHOD(uart_ipend, exynos4210_bus_ipend),
+ KOBJMETHOD(uart_param, exynos4210_bus_param),
+ KOBJMETHOD(uart_receive, exynos4210_bus_receive),
+ KOBJMETHOD(uart_setsig, exynos4210_bus_setsig),
+ KOBJMETHOD(uart_transmit, exynos4210_bus_transmit),
+ {0, 0 }
+};
+
+static kobj_method_t s5l_methods[] = {
+ KOBJMETHOD(uart_probe, exynos4210_bus_probe),
+ KOBJMETHOD(uart_attach, exynos4210_bus_attach),
+ KOBJMETHOD(uart_flush, exynos4210_bus_flush),
+ KOBJMETHOD(uart_getsig, exynos4210_bus_getsig),
+ KOBJMETHOD(uart_ioctl, exynos4210_bus_ioctl),
+ KOBJMETHOD(uart_ipend, s5l_bus_ipend),
+ KOBJMETHOD(uart_param, exynos4210_bus_param),
+ KOBJMETHOD(uart_receive, exynos4210_bus_receive),
+ KOBJMETHOD(uart_setsig, exynos4210_bus_setsig),
+ KOBJMETHOD(uart_transmit, exynos4210_bus_transmit),
+ {0, 0 }
+};
+
+int
+exynos4210_bus_probe(struct uart_softc *sc)
+{
+
+ sc->sc_txfifosz = 16;
+ sc->sc_rxfifosz = 16;
+
+ return (0);
+}
+
+static int
+exynos4210_bus_attach(struct uart_softc *sc)
+{
+ struct exynos_uart_class *class;
+ struct exynos_uart_cfg *cfg;
+
+ sc->sc_hwiflow = 0;
+ sc->sc_hwoflow = 0;
+
+ class = (struct exynos_uart_class
*)ofw_bus_search_compatible(sc->sc_dev,
+ compat_data)->ocd_data;
+ MPASS(class != NULL);
+
+ cfg = &class->cfg;
+ MPASS(sc->sc_sysdev == NULL || cfg == sc->sc_sysdev->bas.driver1);
+ sc->sc_bas.driver1 = cfg;
+
+ return (0);
+}
+
+static int
+exynos4210_bus_transmit(struct uart_softc *sc)
+{
+ struct exynos_uart_cfg *cfg;
+ int i;
+ int reg;
+
+ cfg = sc->sc_bas.driver1;
+ uart_lock(sc->sc_hwmtx);
+
+ /* tx fifo has room, fire away. */
+ for (i = 0; i < sc->sc_txdatasz; i++) {
+ uart_setreg(&sc->sc_bas, SSCOM_UTXH, sc->sc_txbuf[i]);
+ uart_barrier(&sc->sc_bas);
+ }
+
+ if (cfg->cfg_type == EXUART_S5L) {
+ sc->sc_txbusy = 1;
+ } else {
+ /* unmask TX interrupt */
+ reg = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh,
+ SSCOM_UINTM);
+ reg &= ~(1 << 2);
+ bus_space_write_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UINTM,
+ reg);
+ }
+
+ uart_unlock(sc->sc_hwmtx);
+
+ return (0);
+}
+
+static int
+exynos4210_bus_setsig(struct uart_softc *sc, int sig)
+{
+
+ return (0);
+}
+
+static int
+exynos4210_bus_receive(struct uart_softc *sc)
+{
+ struct uart_bas *bas;
+
+ bas = &sc->sc_bas;
+ uart_lock(sc->sc_hwmtx);
+
+ while (exynos4210_rxready_impl(bas, true)) {
+ if (uart_rx_full(sc)) {
+ sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
+ break;
+ }
+
+ uart_rx_put(sc, uart_getreg(&sc->sc_bas, SSCOM_URXH));
+ }
+
+ uart_unlock(sc->sc_hwmtx);
+
+ return (0);
+}
+
+static int
+exynos4210_bus_param(struct uart_softc *sc, int baudrate, int databits,
+ int stopbits, int parity)
+{
+ int error;
+
+ if (sc->sc_bas.rclk == 0)
+ sc->sc_bas.rclk = DEF_CLK;
+
+ KASSERT(sc->sc_bas.rclk != 0, ("exynos4210_init: Invalid rclk"));
+
+ uart_lock(sc->sc_hwmtx);
+ error = exynos4210_uart_param(&sc->sc_bas, baudrate, databits, stopbits,
+ parity);
+ uart_unlock(sc->sc_hwmtx);
+
+ return (error);
+}
+
+static int
+s5l_bus_ipend(struct uart_softc *sc)
+{
+ int ipend;
+ uint32_t uerstat, utrstat;
+
+ ipend = 0;
+ uart_lock(sc->sc_hwmtx);
+ utrstat = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh,
+ SSCOM_UTRSTAT);
+
+ if (utrstat & (UTRSTAT_S5L_RXTHRESH | UTRSTAT_S5L_RX_TIMEOUT))
+ ipend |= SER_INT_RXREADY;
+
+ if (utrstat & UTRSTAT_S5L_TXTHRESH)
+ ipend |= SER_INT_TXIDLE;
+
+ uerstat = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh,
+ SSCOM_UERSTAT);
+ if ((uerstat & UERSTAT_BREAK) != 0)
+ ipend |= SER_INT_BREAK;
+
+ bus_space_write_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UTRSTAT,
+ utrstat);
+ uart_unlock(sc->sc_hwmtx);
+
+ return (ipend);
+}
+
+static int
+exynos4210_bus_ipend(struct uart_softc *sc)
+{
+ uint32_t ints;
+ int reg;
+ int ipend;
+
+ uart_lock(sc->sc_hwmtx);
+ ints = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UINTP);
+ bus_space_write_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UINTP, ints);
+
+ ipend = 0;
+ if ((ints & UINTP_TXEMPTY) != 0) {
+ if (sc->sc_txbusy != 0)
+ ipend |= SER_INT_TXIDLE;
+
+ /* mask TX interrupt */
+ reg = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh,
+ SSCOM_UINTM);
+ reg |= UINTM_TXINTR;
+ bus_space_write_4(sc->sc_bas.bst, sc->sc_bas.bsh,
+ SSCOM_UINTM, reg);
+ }
+
+ if ((ints & UINTP_RXREADY) != 0) {
+ ipend |= SER_INT_RXREADY;
+ }
+
+ uart_unlock(sc->sc_hwmtx);
+ return (ipend);
+}
+
+static int
+exynos4210_bus_flush(struct uart_softc *sc, int what)
+{
+
+ return (0);
+}
+
+static int
+exynos4210_bus_getsig(struct uart_softc *sc)
+{
+
+ return (0);
+}
+
+static int
+exynos4210_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
+{
+
+ return (EINVAL);
+}
+
+static struct ofw_compat_data compat_data[] = {
+ {"apple,s5l-uart", (uintptr_t)&uart_s5l_class.base},
+ {"samsung,exynos4210-uart", (uintptr_t)&uart_ex4210_class.base},
+ {NULL, (uintptr_t)NULL},
+};
+UART_FDT_CLASS_AND_DEVICE(compat_data);
diff --git a/sys/arm64/apple/exynos_uart.h b/sys/arm64/apple/exynos_uart.h
new file mode 100644
index 000000000000..6c817252a69a
--- /dev/null
+++ b/sys/arm64/apple/exynos_uart.h
@@ -0,0 +1,136 @@
+/* $NetBSD: s3c2xx0reg.h,v 1.4 2004/02/12 03:47:29 bsh Exp $ */
+
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2002, 2003 Fujitsu Component Limited
+ * Copyright (c) 2002, 2003 Genetec Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of The Fujitsu Component Limited nor the name of
+ * Genetec corporation may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
+ * CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
+ * CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* s3c2410-specific registers */
+#define UMCON_AFC (1 << 4) /* auto flow control */
+#define UMSTAT_DCTS (1 << 2) /* CTS change */
+#define ULCON_IR (1 << 6)
+#define ULCON_PARITY_SHIFT 3
+
+/*
+ * Exynos-specific
+ *
+ * UFSTAT_TXFULL register differs between Exynos and others.
+ * Others have UFSTAT_TXFULL (1 << 9)
+ */
+#define UFSTAT_TXFULL (1 << 24)
+#define UFSTAT_S5L_TXFULL (1 << 9)
+
+#define SSCOM_UINTM 0x038
+#define UINTM_TXINTR (1 << 2)
+#define SSCOM_UINTP 0x030
+#define UINTP_RXREADY (1 << 0)
+#define UINTP_TXEMPTY (1 << 2)
+
+/* common for s3c2800 and s3c24x0 */
+#define SSCOM_ULCON 0x00 /* UART line control */
+#define ULCON_PARITY_NONE (0 << ULCON_PARITY_SHIFT)
+#define ULCON_PARITY_ODD (4 << ULCON_PARITY_SHIFT)
+#define ULCON_PARITY_EVEN (5 << ULCON_PARITY_SHIFT)
+#define ULCON_PARITY_ONE (6 << ULCON_PARITY_SHIFT)
+#define ULCON_PARITY_ZERO (7 << ULCON_PARITY_SHIFT)
+#define ULCON_STOP (1 << 2)
+#define ULCON_LENGTH_5 0
+#define ULCON_LENGTH_6 1
+#define ULCON_LENGTH_7 2
+#define ULCON_LENGTH_8 3
+#define SSCOM_UCON 0x04 /* UART control */
+#define UCON_TXINT_TYPE (1 << 9) /* Tx interrupt.
0=pulse,1=level */
+#define UCON_TXINT_TYPE_LEVEL UCON_TXINT_TYPE
+#define UCON_TXINT_TYPE_PULSE 0
+#define UCON_RXINT_TYPE (1 << 8) /* Rx interrupt */
+#define UCON_RXINT_TYPE_LEVEL UCON_RXINT_TYPE
+#define UCON_RXINT_TYPE_PULSE 0
+#define UCON_TOINT (1 << 7) /* Rx timeout interrupt
*/
+#define UCON_ERRINT (1 << 6) /* receive error
interrupt */
+#define UCON_LOOP (1 << 5) /* loopback */
+#define UCON_SBREAK (1 << 4) /* send break */
+#define UCON_TXMODE_DISABLE (0 << 2)
+#define UCON_TXMODE_INT (1 << 2)
+#define UCON_TXMODE_DMA (2 << 2)
+#define UCON_TXMODE_MASK (3 << 2)
+#define UCON_RXMODE_DISABLE (0 << 0)
+#define UCON_RXMODE_INT (1 << 0)
+#define UCON_RXMODE_DMA (2 << 0)
+#define UCON_RXMODE_MASK (3 << 0)
+#define UCON_S5L_RX_TIMEOUT (0x1 << 9)
+#define UCON_S5L_RXTHRESH (0x1 << 12)
+#define UCON_S5L_TXTHRESH (0x1 << 13)
+#define SSCOM_UFCON 0x08 /* FIFO control */
+#define UFCON_TXTRIGGER_0 (0 << 6)
+#define UFCON_TXTRIGGER_4 (1 << 6)
+#define UFCON_TXTRIGGER_8 (2 << 6)
+#define UFCON_TXTRIGGER_16 (3 << 6)
+#define UFCON_RXTRIGGER_4 (0 << 4)
+#define UFCON_RXTRIGGER_8 (1 << 4)
+#define UFCON_RXTRIGGER_12 (2 << 4)
+#define UFCON_RXTRIGGER_16 (3 << 4)
+#define UFCON_TXFIFO_RESET (1 << 2)
+#define UFCON_RXFIFO_RESET (1 << 1)
+#define UFCON_FIFO_ENABLE (1 << 0)
+#define SSCOM_UMCON 0x0c /* MODEM control */
+#define UMCON_RTS (1 << 0) /* Request to send */
+#define SSCOM_UTRSTAT 0x10 /* Status register */
+#define UTRSTAT_TXSHIFTER_EMPTY ( 1<< 2)
+#define UTRSTAT_TXEMPTY (1 << 1) /* TX fifo or buffer
empty */
+#define UTRSTAT_RXREADY (1 << 0) /* RX fifo or buffer is
not empty */
+#define UTRSTAT_S5L_RXTHRESH (0x1 << 4)
+#define UTRSTAT_S5L_TXTHRESH (0x1 << 5)
+#define UTRSTAT_S5L_RX_TIMEOUT (0x1 << 9)
+#define SSCOM_UERSTAT 0x14 /* Error status
register */
+#define UERSTAT_BREAK (1 << 3) /* Break signal, not
2410 */
+#define UERSTAT_FRAME (1 << 2) /* Frame error */
+#define UERSTAT_PARITY (1 << 1) /* Parity error, not
2410 */
+#define UERSTAT_OVERRUN (1 << 0) /* Overrun */
+#define UERSTAT_ALL_ERRORS \
+ (UERSTAT_OVERRUN|UERSTAT_BREAK|UERSTAT_FRAME|UERSTAT_PARITY)
+#define SSCOM_UFSTAT 0x18 /* Fifo status register
*/
+#define UFSTAT_RXFULL (1 <<8) /* Rx fifo full */
+#define UFSTAT_TXCOUNT_SHIFT 4 /* TX FIFO count */
+#define UFSTAT_TXCOUNT (0x0f << UFSTAT_TXCOUNT_SHIFT)
+#define UFSTAT_RXCOUNT_SHIFT 0 /* RX FIFO count */
+#define UFSTAT_RXCOUNT (0x0f << UFSTAT_RXCOUNT_SHIFT)
+#define SSCOM_UMSTAT 0x1c /* Modem status
register */
+#define UMSTAT_CTS (1 << 0) /* Clear to send */
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+#define SSCOM_UTXH 0x20 /* Transmit data
register */
+#define SSCOM_URXH 0x24 /* Receive data
register */
+#else
+#define SSCOM_UTXH 0x23 /* Transmit data
register */
+#define SSCOM_URXH 0x27 /* Receive data
register */
+#endif
+#define SSCOM_UBRDIV 0x28 /* baud-reate divisor */
+#define SSCOM_SIZE 0x2c
diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
index 480f1ac78905..74387914043e 100644
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -548,6 +548,7 @@ arm/annapurna/alpine/alpine_serdes.c
optional al_serdes fdt \
# Apple
arm64/apple/apple_aic.c optional
soc_apple_t8103 fdt
arm64/apple/apple_wdog.c optional soc_apple_t8103 fdt
+arm64/apple/exynos_uart.c optional soc_apple_t8103 fdt
# Broadcom
arm64/broadcom/brcmmdio/mdio_mux_iproc.c optional soc_brcm_ns2
fdt
diff --git a/sys/dev/uart/uart.h b/sys/dev/uart/uart.h
index 9b80f0148dc2..b9401996e655 100644
--- a/sys/dev/uart/uart.h
+++ b/sys/dev/uart/uart.h
@@ -40,6 +40,7 @@
struct uart_bas {
bus_space_tag_t bst;
bus_space_handle_t bsh;
+ void *driver1;
u_int chan;
u_int rclk;
u_int regshft;
