add35ed5b8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
156 lines
4.8 KiB
C
156 lines
4.8 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 "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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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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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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