lpc_pwr.c revision 256281
1/*- 2 * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: stable/10/sys/arm/lpc/lpc_pwr.c 239278 2012-08-15 05:37:10Z gonzo $"); 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/bus.h> 34#include <sys/kernel.h> 35#include <sys/module.h> 36#include <sys/malloc.h> 37#include <sys/rman.h> 38#include <machine/bus.h> 39#include <machine/intr.h> 40 41#include <dev/ofw/ofw_bus.h> 42#include <dev/ofw/ofw_bus_subr.h> 43 44#include <arm/lpc/lpcreg.h> 45#include <arm/lpc/lpcvar.h> 46 47struct lpc_pwr_softc { 48 device_t dp_dev; 49 struct resource * dp_mem_res; 50 bus_space_tag_t dp_bst; 51 bus_space_handle_t dp_bsh; 52}; 53 54static struct lpc_pwr_softc *lpc_pwr_sc = NULL; 55 56static int lpc_pwr_probe(device_t); 57static int lpc_pwr_attach(device_t); 58 59#define lpc_pwr_read_4(_sc, _reg) \ 60 bus_space_read_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg) 61#define lpc_pwr_write_4(_sc, _reg, _val) \ 62 bus_space_write_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg, _val) 63 64static int 65lpc_pwr_probe(device_t dev) 66{ 67 68 if (!ofw_bus_is_compatible(dev, "lpc,pwr")) 69 return (ENXIO); 70 71 device_set_desc(dev, "LPC32x0 Power Controller"); 72 return (BUS_PROBE_DEFAULT); 73} 74 75static int 76lpc_pwr_attach(device_t dev) 77{ 78 struct lpc_pwr_softc *sc = device_get_softc(dev); 79 int rid; 80 81 sc->dp_dev = dev; 82 83 rid = 0; 84 sc->dp_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 85 RF_ACTIVE); 86 if (!sc->dp_mem_res) { 87 device_printf(dev, "cannot allocate memory window\n"); 88 return (ENXIO); 89 } 90 91 sc->dp_bst = rman_get_bustag(sc->dp_mem_res); 92 sc->dp_bsh = rman_get_bushandle(sc->dp_mem_res); 93 94 lpc_pwr_sc = sc; 95 96 return (0); 97} 98 99uint32_t 100lpc_pwr_read(device_t dev, int reg) 101{ 102 return (lpc_pwr_read_4(lpc_pwr_sc, reg)); 103} 104 105void 106lpc_pwr_write(device_t dev, int reg, uint32_t value) 107{ 108 lpc_pwr_write_4(lpc_pwr_sc, reg, value); 109} 110 111static device_method_t lpc_pwr_methods[] = { 112 /* Device interface */ 113 DEVMETHOD(device_probe, lpc_pwr_probe), 114 DEVMETHOD(device_attach, lpc_pwr_attach), 115 { 0, 0 } 116}; 117 118static devclass_t lpc_pwr_devclass; 119 120static driver_t lpc_pwr_driver = { 121 "pwr", 122 lpc_pwr_methods, 123 sizeof(struct lpc_pwr_softc), 124}; 125 126DRIVER_MODULE(pwr, simplebus, lpc_pwr_driver, lpc_pwr_devclass, 0, 0); 127