dc0996af4e
UART drivers. - uart_dev_mtk.[ch] are the old-style Mediatek/Ralink-specific UART driver as also found in sys/mips/rt305x/uart_dev_rt305x.c, with minor improvements and FDT attachment enabled for the appropriate SoCs. - uart_dev_mtk_ns8250.c is the new-style ns16550a-compatible UART driver found in newer Mediatek SoCs. It uses the uart_dev_ns8250.c driver indirectly and is basically just a wrapper around it and only overrides its probe method. The reason I am not using the uart_dev_ns8250.c driver directly is because I have some code that does UART clock detection before initializing the UART, so that we don't need to hard-code the UART clock frequency in the dts files for each board. Approved by: adrian (mentor) Sponsored by: Smartcom - Bulgaria AD Differential Revision: https://reviews.freebsd.org/D5840
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_platform.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <mips/mediatek/mtk_soc.h>
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#include <mips/mediatek/mtk_sysctl.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_cpu_fdt.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_dev_ns8250.h>
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#include "uart_if.h"
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/*
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* High-level UART interface.
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*/
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static struct uart_class uart_mtk_ns8250_class;
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static int mtk_ns8250_bus_probe(struct uart_softc *);
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static kobj_method_t mtk_ns8250_methods[] = {
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KOBJMETHOD(uart_probe, mtk_ns8250_bus_probe),
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KOBJMETHOD(uart_attach, ns8250_bus_attach),
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KOBJMETHOD(uart_detach, ns8250_bus_detach),
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KOBJMETHOD(uart_flush, ns8250_bus_flush),
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KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
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KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
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KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
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KOBJMETHOD(uart_param, ns8250_bus_param),
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KOBJMETHOD(uart_receive, ns8250_bus_receive),
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KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
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KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
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KOBJMETHOD_END
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};
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static struct uart_class uart_mtk_ns8250_class = {
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"mtk8250",
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mtk_ns8250_methods,
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sizeof(struct ns8250_softc),
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.uc_ops = &uart_ns8250_ops,
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.uc_range = 1, /* use hinted range */
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.uc_rclk = 0,
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.uc_rshift = 2
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};
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static struct ofw_compat_data compat_data[] = {
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{ "mtk,ns16550a", (uintptr_t)&uart_mtk_ns8250_class },
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{ "ns16550a", (uintptr_t)&uart_mtk_ns8250_class },
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{ NULL, (uintptr_t)NULL },
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};
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UART_FDT_CLASS_AND_DEVICE(compat_data);
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static int
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mtk_ns8250_bus_probe(struct uart_softc *sc)
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{
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int status;
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if (!ofw_bus_status_okay(sc->sc_dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(sc->sc_dev, compat_data)->ocd_data ==
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(uintptr_t)NULL)
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return (ENXIO);
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sc->sc_bas.rclk = mtk_soc_get_uartclk();
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status = ns8250_bus_probe(sc);
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if (status == 0)
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device_set_desc(sc->sc_dev, "MTK UART Controller (ns16550a)");
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return (status);
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}
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