159 lines
4.9 KiB
C
159 lines
4.9 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 "opt_platform.h"
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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 <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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/*
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* Compatible devices. Keep this sorted in most- to least-specific order first,
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* alphabetical second. That is, "zwie,ns16550" should appear before "ns16550"
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* on the theory that the zwie driver knows how to make better use of the
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* hardware than the generic driver. Likewise with chips within a family, the
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* highest-numbers / most recent models should probably appear earlier.
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*/
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static struct ofw_compat_data compat_data[] = {
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{"arm,pl011", (uintptr_t)&uart_pl011_class},
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{"atmel,at91rm9200-usart",(uintptr_t)&at91_usart_class},
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{"atmel,at91sam9260-usart",(uintptr_t)&at91_usart_class},
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{"cadence,uart", (uintptr_t)&uart_cdnc_class},
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{"exynos", (uintptr_t)&uart_s3c2410_class},
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{"fsl,imx6q-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx53-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx51-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx31-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx27-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx25-uart", (uintptr_t)&uart_imx_class},
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{"fsl,imx21-uart", (uintptr_t)&uart_imx_class},
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{"fsl,mvf600-uart", (uintptr_t)&uart_vybrid_class},
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{"lpc,uart", (uintptr_t)&uart_lpc_class},
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{"ti,ns16550", (uintptr_t)&uart_ti8250_class},
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{"ns16550", (uintptr_t)&uart_ns8250_class},
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{NULL, (uintptr_t)NULL},
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};
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/* Export the compat_data table for use by the uart_cpu_fdt.c probe routine. */
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const struct ofw_compat_data *uart_fdt_compat_data = compat_data;
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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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/*
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* clock-frequency is a FreeBSD-specific hack. Make its presence optional.
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*/
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if ((OF_getprop(node, "clock-frequency", &clock,
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sizeof(clock))) <= 0)
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clock = 0;
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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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const struct ofw_compat_data * cd;
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sc = device_get_softc(dev);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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cd = ofw_bus_search_compatible(dev, compat_data);
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if (cd->ocd_data == (uintptr_t)NULL)
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return (ENXIO);
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sc->sc_class = (struct uart_class *)cd->ocd_data;
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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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