fbd68c4b4c
compilation of kernels without ns8250 support but using the uart framework. These kernels will be for machines where size matters more, so including code that can never be executed is undesriable...
103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/*-
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* Copyright (c) 2003, 2004 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 <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 <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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bus_space_tag_t uart_bus_space_io = I386_BUS_SPACE_IO;
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bus_space_tag_t uart_bus_space_mem = I386_BUS_SPACE_MEM;
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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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unsigned int i, ivar;
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/* Check the environment. */
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di->ops = uart_ns8250_ops;
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if (uart_getenv(devtype, di) == 0)
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return (0);
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/*
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* Scan the hints. We only try units 0 to 3 (inclusive). This
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* covers the ISA legacy where 4 UARTs had their resources
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* predefined.
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*/
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for (i = 0; i < 4; i++) {
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if (resource_int_value("uart", i, "flags", &ivar))
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continue;
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if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
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continue;
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if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
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continue;
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/*
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* We have a possible device. Make sure it's enabled and
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* that we have an I/O port.
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*/
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if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
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ivar != 0)
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continue;
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if (resource_int_value("uart", i, "port", &ivar) != 0 ||
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ivar == 0)
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continue;
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/*
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* Got it. Fill in the instance and return it. We only have
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* ns8250 and successors on i386.
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*/
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di->ops = uart_ns8250_ops;
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di->bas.chan = 0;
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di->bas.bst = uart_bus_space_io;
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if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0)
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continue;
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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if (resource_int_value("uart", i, "baud", &ivar) != 0)
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ivar = 0;
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di->baudrate = ivar;
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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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return (0);
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}
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return (ENXIO);
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}
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