1/*- 2 * Copyright (c) 2006 Benno Rice. 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: stable/11/sys/arm/xscale/pxa/uart_bus_pxa.c 340145 2018-11-04 23:28:56Z mmacy $"); 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 40#include <dev/uart/uart.h> 41#include <dev/uart/uart_bus.h> 42#include <dev/uart/uart_cpu.h> 43 44#include <dev/ic/ns16550.h> 45 46#include <arm/xscale/pxa/pxavar.h> 47#include <arm/xscale/pxa/pxareg.h> 48 49#include "uart_if.h" 50 51#define PXA_UART_UUE 0x40 /* UART Unit Enable */ 52 53static int uart_pxa_probe(device_t dev); 54 55static device_method_t uart_pxa_methods[] = { 56 /* Device interface */ 57 DEVMETHOD(device_probe, uart_pxa_probe), 58 DEVMETHOD(device_attach, uart_bus_attach), 59 DEVMETHOD(device_detach, uart_bus_detach), 60 { 0, 0 } 61}; 62 63static driver_t uart_pxa_driver = { 64 uart_driver_name, 65 uart_pxa_methods, 66 sizeof(struct uart_softc), 67}; 68 69static int 70uart_pxa_probe(device_t dev) 71{ 72 bus_space_handle_t base; 73 struct uart_softc *sc; 74 75 base = (bus_space_handle_t)pxa_get_base(dev); 76#ifdef QEMU_WORKAROUNDS 77 /* 78 * QEMU really exposes only the first uart unless 79 * you specify several of them in the configuration. 80 * Otherwise all the rest of UARTs stay unconnected, 81 * which causes problems in the ns16550 attach routine. 82 * Unfortunately, even if you provide qemu with 4 uarts 83 * on the command line, it has a bug where it segfaults 84 * trying to enable bluetooth on the HWUART. So we just 85 * allow the FFUART to be attached. 86 * Also, don't check the UUE (UART Unit Enable) bit, as 87 * the gumstix bootloader doesn't set it. 88 */ 89 if (base != PXA2X0_FFUART_BASE) 90 return (ENXIO); 91#else 92 /* Check to see if the enable bit's on. */ 93 if ((bus_space_read_4(obio_tag, base, 94 (REG_IER << 2)) & PXA_UART_UUE) == 0) 95 return (ENXIO); 96#endif 97 sc = device_get_softc(dev); 98 sc->sc_class = &uart_ns8250_class; 99 100 return(uart_bus_probe(dev, 2, 0, PXA2X0_COM_FREQ, 0, 0, 0)); 101} 102 103DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0); 104