d5d776c16b
Add a new option, SKYEYE_WORKAROUNDS, which as the name suggests adds workarounds for things skyeye doesn't simulate. Specifically : - Use USART0 instead of DBGU as the console, make it not use DMA, and manually provoke an interrupt when we're done in the transmit function. - Skyeye maintains an internal counter for clock, but apparently there's no way to access it, so hack the timecounter code to return a value which is increased at every clock interrupts. This is gross, but I didn't find a better way to implement timecounters without hacking Skyeye to get the counter value. - Force the write-back of PTEs once we're done writing them, even if they are supposed to be write-through. I don't know why I have to do that.
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*-
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* Copyright (c) 2005 Olivier Houchard. 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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* 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_uart.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/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/pci/pcivar.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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#include <arm/at91/at91rm92reg.h>
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#include "uart_if.h"
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static int usart_at91rm92_probe(device_t dev);
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extern struct uart_class at91_usart_class;
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static device_method_t usart_at91rm92_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, usart_at91rm92_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 usart_at91rm92_driver = {
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uart_driver_name,
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usart_at91rm92_methods,
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sizeof(struct uart_softc),
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};
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extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
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static int
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usart_at91rm92_probe(device_t dev)
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{
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struct uart_softc *sc;
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sc = device_get_softc(dev);
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switch (device_get_unit(dev))
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{
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case 0:
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#ifdef SKYEYE_WORKAROUNDS
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device_set_desc(dev, "USART0");
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#else
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device_set_desc(dev, "DBGU");
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#endif
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/*
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* Setting sc_sysdev makes this device a 'system device' and
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* indirectly makes it the system console.
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*/
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sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
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bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
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break;
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case 1:
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device_set_desc(dev, "USART0");
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break;
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case 2:
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device_set_desc(dev, "USART1");
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break;
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case 3:
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device_set_desc(dev, "USART2");
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break;
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case 4:
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device_set_desc(dev, "USART3");
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break;
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}
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sc->sc_class = &at91_usart_class;
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return (uart_bus_probe(dev, 0, 0, 0, device_get_unit(dev)));
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}
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DRIVER_MODULE(uart, atmelarm, usart_at91rm92_driver, uart_devclass, 0, 0);
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