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aef60d8c4a
The TI uart hardware is ns16550-compatible, except that before it can be used the clocks and power have to be enabled and a non-standard mode control register has to be set to put the device in uart mode (as opposed to irDa or other serial protocols). This adds the extra code in an extension to the standard ns8250 probe routine, and the rest of the driver is just the standard ns8250 code.
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Semihalf under sponsorship from
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* the FreeBSD Foundation.
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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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* 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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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/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <machine/fdt.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_bus.h>
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#include <dev/uart/uart_cpu.h>
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static int uart_fdt_probe(device_t);
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static device_method_t uart_fdt_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_fdt_probe),
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DEVMETHOD(device_attach, uart_bus_attach),
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DEVMETHOD(device_detach, uart_bus_detach),
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{ 0, 0 }
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};
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static driver_t uart_fdt_driver = {
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uart_driver_name,
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uart_fdt_methods,
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sizeof(struct uart_softc),
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};
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static int
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uart_fdt_get_clock(phandle_t node, pcell_t *cell)
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{
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pcell_t clock;
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if ((OF_getprop(node, "clock-frequency", &clock,
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sizeof(clock))) <= 0)
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return (ENXIO);
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if (clock == 0)
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/* Try to retrieve parent 'bus-frequency' */
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/* XXX this should go to simple-bus fixup or so */
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if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
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sizeof(clock))) <= 0)
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clock = 0;
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*cell = fdt32_to_cpu(clock);
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return (0);
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}
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static int
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uart_fdt_get_shift(phandle_t node, pcell_t *cell)
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{
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pcell_t shift;
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if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
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shift = 0;
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*cell = fdt32_to_cpu(shift);
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return (0);
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}
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static int
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uart_fdt_probe(device_t dev)
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{
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struct uart_softc *sc;
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phandle_t node;
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pcell_t clock, shift;
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int err;
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sc = device_get_softc(dev);
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if (ofw_bus_is_compatible(dev, "lpc,uart"))
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sc->sc_class = &uart_lpc_class;
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else if (ofw_bus_is_compatible(dev, "fsl,imx-uart"))
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sc->sc_class = &uart_imx_class;
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else if (ofw_bus_is_compatible(dev, "arm,pl011"))
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sc->sc_class = &uart_pl011_class;
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else if (ofw_bus_is_compatible(dev, "exynos"))
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sc->sc_class = &uart_s3c2410_class;
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else if (ofw_bus_is_compatible(dev, "cadence,uart"))
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sc->sc_class = &uart_cdnc_class;
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else if (ofw_bus_is_compatible(dev, "ti,ns16550"))
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sc->sc_class = &uart_ti8250_class;
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else if (ofw_bus_is_compatible(dev, "ns16550"))
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sc->sc_class = &uart_ns8250_class;
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else
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return (ENXIO);
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node = ofw_bus_get_node(dev);
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if ((err = uart_fdt_get_clock(node, &clock)) != 0)
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return (err);
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uart_fdt_get_shift(node, &shift);
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return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
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}
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DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
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