uart_bus_ixp425.c revision 164426
1/*- 2 * Copyright (c) 2006 Kevin Lo. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25#include <sys/cdefs.h> 26__FBSDID("$FreeBSD: head/sys/arm/xscale/ixp425/uart_bus_ixp425.c 164426 2006-11-19 23:55:23Z sam $"); 27 28#include <sys/param.h> 29#include <sys/systm.h> 30#include <sys/bus.h> 31#include <sys/conf.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <machine/bus.h> 35#include <sys/rman.h> 36#include <machine/resource.h> 37 38#include <dev/pci/pcivar.h> 39#include <dev/ic/ns16550.h> 40 41#include <dev/uart/uart.h> 42#include <dev/uart/uart_bus.h> 43#include <dev/uart/uart_cpu.h> 44 45#include <arm/xscale/ixp425/ixp425reg.h> 46#include <arm/xscale/ixp425/ixp425var.h> 47 48#include "uart_if.h" 49 50static int uart_ixp425_probe(device_t dev); 51 52static device_method_t uart_ixp425_methods[] = { 53 /* Device interface */ 54 DEVMETHOD(device_probe, uart_ixp425_probe), 55 DEVMETHOD(device_attach, uart_bus_attach), 56 DEVMETHOD(device_detach, uart_bus_detach), 57 { 0, 0 } 58}; 59 60static driver_t uart_ixp425_driver = { 61 uart_driver_name, 62 uart_ixp425_methods, 63 sizeof(struct uart_softc), 64}; 65 66extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; 67static int 68uart_ixp425_probe(device_t dev) 69{ 70 struct uart_softc *sc; 71 72 sc = device_get_softc(dev); 73 sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs); 74 sc->sc_class = &uart_ns8250_class; 75 bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas)); 76 /* 77 * XXX set UART Unit Enable (0x40) AND 78 * receiver timeout int enable (0x10). 79 * The first turns on the UART. The second is necessary to get 80 * interrupts when the FIFO has data but is not full. Note that 81 * uart_ns8250 carefully avoids touching these bits so we can 82 * just set them here and proceed. But this is fragile... 83 */ 84 bus_space_write_4(&ixp425_a4x_bs_tag, 85 device_get_unit(dev) == 0 ? IXP425_UART0_VBASE : IXP425_UART1_VBASE, 86 IXP425_UART_IER, IXP425_UART_IER_UUE | IXP425_UART_IER_RTOIE); 87 return(uart_bus_probe(dev, 0, IXP425_UART_FREQ, 0, 0)); 88} 89 90 91DRIVER_MODULE(uart, ixp, uart_ixp425_driver, uart_devclass, 0, 0); 92