uart_bus_chipc.c revision 299994
1/*- 2 * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com> 3 * 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/sys/mips/broadcom/uart_bus_chipc.c 299994 2016-05-17 00:00:01Z adrian $"); 30 31#include "opt_uart.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37#include <sys/kernel.h> 38#include <sys/module.h> 39#include <sys/rman.h> 40 41#include <machine/bus.h> 42#include <machine/resource.h> 43 44#include <dev/uart/uart.h> 45#include <dev/uart/uart_bus.h> 46#include <dev/uart/uart_cpu.h> 47 48#include "uart_if.h" 49#include "bhnd_chipc_if.h" 50 51static int uart_chipc_probe(device_t dev); 52 53extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; 54 55static void 56uart_chipc_identify(driver_t *driver, device_t parent) 57{ 58 struct chipc_capabilities *caps; 59 60 caps = BHND_CHIPC_GET_CAPABILITIES(parent); 61 62 if (caps->num_uarts == 0) 63 return; 64 65 /* 66 * TODO: add more than one UART 67 */ 68 BUS_ADD_CHILD(parent, 0, "uart", -1); 69} 70 71static int 72uart_chipc_probe(device_t dev) 73{ 74 struct uart_softc *sc; 75 struct resource *res; 76 int rid; 77 78 rid = 0; 79 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 80 if (res == NULL) { 81 device_printf(dev, "can't allocate main resource\n"); 82 return (ENXIO); 83 } 84 85 sc = device_get_softc(dev); 86 sc->sc_class = &uart_ns8250_class; 87 sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs); 88 if (sc->sc_sysdev == NULL) { 89 device_printf(dev, "missing sysdev\n"); 90 return (EINVAL); 91 } 92 93 bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas)); 94 95 sc->sc_sysdev->bas.bst = rman_get_bustag(res); 96 sc->sc_sysdev->bas.bsh = rman_get_bushandle(res); 97 sc->sc_bas.bst = sc->sc_sysdev->bas.bst; 98 sc->sc_bas.bsh = sc->sc_sysdev->bas.bsh; 99 100 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 101 102 /* We use internal SoC clock generator with non-standart freq MHz */ 103 return (uart_bus_probe(dev, 0, sc->sc_sysdev->bas.rclk, 0, 0)); 104} 105 106static device_method_t uart_chipc_methods[] = { 107 /* Device interface */ 108 DEVMETHOD(device_identify, uart_chipc_identify), 109 DEVMETHOD(device_probe, uart_chipc_probe), 110 DEVMETHOD(device_attach, uart_bus_attach), 111 DEVMETHOD(device_detach, uart_bus_detach), 112 { 0, 0 } 113}; 114 115static driver_t uart_chipc_driver = { 116 uart_driver_name, 117 uart_chipc_methods, 118 sizeof(struct uart_softc), 119}; 120 121DRIVER_MODULE(uart, bhnd_chipc, uart_chipc_driver, uart_devclass, 0, 0); 122