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.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*-
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* Copyright (c) 2003 Marcel Moolenaar
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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_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/cons.h>
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#include <machine/bus.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 <arm/at91/at91rm92reg.h>
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bus_space_tag_t uart_bus_space_io;
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bus_space_tag_t uart_bus_space_mem;
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extern struct uart_ops at91_usart_ops;
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extern struct bus_space at91_bs_tag;
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int
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uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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{
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return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
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}
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int
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uart_cpu_getdev(int devtype, struct uart_devinfo *di)
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{
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di->ops = at91_usart_ops;
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di->bas.chan = 0;
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di->bas.bst = &at91_bs_tag;
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/*
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* XXX: Not pretty, but will work because we map VA == PA early
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* for the last 1MB of memory.
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*/
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#ifdef SKYEYE_WORKAROUNDS
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di->bas.bsh = AT91RM92_BASE + AT91RM92_USART0_BASE;
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di->baudrate = 38400;
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#else
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di->bas.bsh = AT91RM92_BASE + AT91RM92_SYS_BASE + DBGU;
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di->baudrate = 115200;
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#endif
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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di->databits = 8;
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di->stopbits = 1;
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di->parity = UART_PARITY_NONE;
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uart_bus_space_io = &at91_bs_tag;
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uart_bus_space_mem = NULL;
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/* Check the environment for overrides */
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if (uart_getenv(devtype, di) == 0)
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return (0);
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return (0);
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}
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