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[src/trunk]: src/sys/dev/fdt Add glue for 8250 compatible UARTs.
details: https://anonhg.NetBSD.org/src/rev/bbd0b88f3e5b
branches: trunk
changeset: 936027:bbd0b88f3e5b
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Thu Jul 16 11:42:53 2020 +0000
description:
Add glue for 8250 compatible UARTs.
diffstat:
sys/dev/fdt/files.fdt | 6 +-
sys/dev/fdt/ns8250_uart.c | 213 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 218 insertions(+), 1 deletions(-)
diffs (237 lines):
diff -r 93b99e6b4664 -r bbd0b88f3e5b sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Thu Jul 16 11:42:17 2020 +0000
+++ b/sys/dev/fdt/files.fdt Thu Jul 16 11:42:53 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.52 2020/03/24 22:09:50 tnn Exp $
+# $NetBSD: files.fdt,v 1.53 2020/07/16 11:42:53 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -112,6 +112,10 @@
attach genfb at fdt with simplefb
file dev/fdt/simplefb.c simplefb
+# NS 8250 compatible UART
+attach com at fdt with ns8250_uart
+file dev/fdt/ns8250_uart.c ns8250_uart
+
# Designware APB UART
attach com at fdt with dw_apb_uart
file dev/fdt/dw_apb_uart.c dw_apb_uart
diff -r 93b99e6b4664 -r bbd0b88f3e5b sys/dev/fdt/ns8250_uart.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/ns8250_uart.c Thu Jul 16 11:42:53 2020 +0000
@@ -0,0 +1,213 @@
+/* $NetBSD: ns8250_uart.c,v 1.1 2020/07/16 11:42:53 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017-2020 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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/cdefs.h>
+
+__KERNEL_RCSID(1, "$NetBSD: ns8250_uart.c,v 1.1 2020/07/16 11:42:53 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/termios.h>
+
+#include <dev/ic/comvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+static int ns8250_uart_match(device_t, cfdata_t, void *);
+static void ns8250_uart_attach(device_t, device_t, void *);
+
+struct ns8250_config {
+ int type;
+ int (*enable)(struct com_softc *);
+ void (*disable)(struct com_softc *);
+};
+
+static const struct ns8250_config ns8250_config = {
+ .type = COM_TYPE_NORMAL,
+};
+
+static const struct ns8250_config ns16750_config = {
+ .type = COM_TYPE_16750,
+};
+
+#define NS8250_OCTEON_USR_REG 0x0138
+
+static int
+ns8250_octeon_enable(struct com_softc *sc)
+{
+ struct com_regs *regsp = &sc->sc_regs;
+
+ /* XXX Clear old busy detect interrupts */
+ bus_space_read_1(regsp->cr_iot, regsp->cr_ioh, NS8250_OCTEON_USR_REG);
+
+ return 0;
+}
+
+static const struct ns8250_config octeon_config = {
+ .type = COM_TYPE_16550_NOERS,
+ .enable = ns8250_octeon_enable,
+};
+
+static const struct of_compat_data compat_data[] = {
+ { "cavium,octeon-3860-uart", (uintptr_t)&octeon_config },
+ { "ns8250", (uintptr_t)&ns8250_config },
+ { "ns16450", (uintptr_t)&ns8250_config },
+ { "ns16550a", (uintptr_t)&ns8250_config },
+ { "ns16550", (uintptr_t)&ns8250_config },
+ { "ns16750", (uintptr_t)&ns16750_config },
+ { NULL }
+};
+
+CFATTACH_DECL_NEW(ns8250_uart, sizeof(struct com_softc),
+ ns8250_uart_match, ns8250_uart_attach, NULL, NULL);
+
+static int
+ns8250_uart_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compat_data(faa->faa_phandle, compat_data);
+}
+
+static void
+ns8250_uart_attach(device_t parent, device_t self, void *aux)
+{
+ struct com_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ bus_space_tag_t bst = faa->faa_bst;
+ bus_space_handle_t bsh;
+ char intrstr[128];
+ struct clk *clk;
+ bus_addr_t addr;
+ bus_size_t size;
+ u_int reg_shift;
+ int error;
+ void *ih;
+
+ const struct ns8250_config *config =
+ (void *)of_search_compatible(phandle, compat_data)->data;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ if (of_getprop_uint32(phandle, "reg-shift", ®_shift)) {
+ /* missing or bad reg-shift property, assume 0 */
+ reg_shift = 0;
+ }
+
+ sc->sc_dev = self;
+ if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency)) {
+ clk = fdtbus_clock_get_index(phandle, 0);
+ if (clk != NULL)
+ sc->sc_frequency = clk_get_rate(clk);
+ }
+ if (sc->sc_frequency == 0) {
+ aprint_error(": couldn't get frequency\n");
+ return;
+ }
+
+ sc->sc_type = config->type;
+ sc->enable = config->enable;
+ sc->disable = config->disable;
+
+ error = bus_space_map(bst, addr, size, 0, &bsh);
+ if (error) {
+ aprint_error(": couldn't map %#" PRIx64 ": %d",
+ (uint64_t)addr, error);
+ return;
+ }
+
+ com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, reg_shift);
+
+ if (config->enable != NULL) {
+ sc->enable(sc);
+ sc->enabled = 1;
+ }
+
+ com_attach_subr(sc);
+
+ if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
+ aprint_error_dev(self, "failed to decode interrupt\n");
+ return;
+ }
+
+ ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL,
+ FDT_INTR_MPSAFE, comintr, sc);
+ if (ih == NULL) {
+ aprint_error_dev(self, "failed to establish interrupt on %s\n",
+ intrstr);
+ return;
+ }
+ aprint_normal_dev(self, "interrupting on %s\n", intrstr);
+}
+
+/*
+ * Console support
+ */
+
+static int
+ns8250_uart_console_match(int phandle)
+{
+ return of_match_compat_data(phandle, compat_data);
+}
+
+static void
+ns8250_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
+{
+ const int phandle = faa->faa_phandle;
+ bus_space_tag_t bst = faa->faa_a4x_bst;
+ bus_addr_t addr;
+ tcflag_t flags;
+ int speed;
+
+ const struct ns8250_config *config =
+ (void *)of_search_compatible(phandle, compat_data)->data;
+
+ fdtbus_get_reg(phandle, 0, &addr, NULL);
+ speed = fdtbus_get_stdout_speed();
+ if (speed < 0)
+ speed = 115200; /* default */
+ flags = fdtbus_get_stdout_flags();
+
+ if (comcnattach(bst, addr, speed, uart_freq, config->type, flags))
+ panic("Cannot initialize ns8250 console");
+}
+
+static const struct fdt_console ns8250_uart_console = {
+ .match = ns8250_uart_console_match,
+ .consinit = ns8250_uart_console_consinit,
+};
+
+FDT_CONSOLE(ns8250_uart, &ns8250_uart_console);
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