bcm2835_mbox_subr.c revision 1.3.2.2
1 1.3.2.2 yamt /* $NetBSD: bcm2835_mbox_subr.c,v 1.3.2.2 2012/10/30 17:18:59 yamt Exp $ */ 2 1.3.2.2 yamt 3 1.3.2.2 yamt /*- 4 1.3.2.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.3.2.2 yamt * All rights reserved. 6 1.3.2.2 yamt * 7 1.3.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 yamt * by Nick Hudson 9 1.3.2.2 yamt * 10 1.3.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 yamt * modification, are permitted provided that the following conditions 12 1.3.2.2 yamt * are met: 13 1.3.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.3.2.2 yamt * 19 1.3.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 yamt */ 31 1.3.2.2 yamt 32 1.3.2.2 yamt #include <sys/cdefs.h> 33 1.3.2.2 yamt __KERNEL_RCSID(0, "$NetBSD: bcm2835_mbox_subr.c,v 1.3.2.2 2012/10/30 17:18:59 yamt Exp $"); 34 1.3.2.2 yamt 35 1.3.2.2 yamt #include <sys/param.h> 36 1.3.2.2 yamt #include <sys/systm.h> 37 1.3.2.2 yamt #include <sys/device.h> 38 1.3.2.2 yamt #include <sys/kernel.h> 39 1.3.2.2 yamt #include <sys/timetc.h> 40 1.3.2.2 yamt #include <sys/bus.h> 41 1.3.2.2 yamt 42 1.3.2.2 yamt #include <arm/broadcom/bcm_amba.h> 43 1.3.2.2 yamt #include <arm/broadcom/bcm2835_mbox.h> 44 1.3.2.2 yamt #include <arm/broadcom/bcm2835_mboxreg.h> 45 1.3.2.2 yamt #include <arm/broadcom/bcm2835reg.h> 46 1.3.2.2 yamt 47 1.3.2.2 yamt 48 1.3.2.2 yamt #define BCM2835_MBOX_CHAN(chan) ((chan) & 0xf) 49 1.3.2.2 yamt #define BCM2835_MBOX_DATA(data) ((data) & ~0xf) 50 1.3.2.2 yamt 51 1.3.2.2 yamt #define BCM2835_MBOX_MSG(chan, data) (((chan) & 0xf) | ((data) & ~0xf)) 52 1.3.2.2 yamt 53 1.3.2.2 yamt void 54 1.3.2.2 yamt bcm2835_mbox_read(bus_space_tag_t iot, bus_space_handle_t ioh, uint8_t chan, 55 1.3.2.2 yamt uint32_t *data) 56 1.3.2.2 yamt { 57 1.3.2.2 yamt uint32_t mbox; 58 1.3.2.2 yamt 59 1.3.2.2 yamt KASSERT((chan & 0xf) == chan); 60 1.3.2.2 yamt 61 1.3.2.2 yamt for (;;) { 62 1.3.2.2 yamt uint8_t rchan; 63 1.3.2.2 yamt uint32_t rdata; 64 1.3.2.2 yamt 65 1.3.2.2 yamt bus_space_barrier(iot, ioh, 0, BCM2835_MBOX_SIZE, 66 1.3.2.2 yamt BUS_SPACE_BARRIER_READ); 67 1.3.2.2 yamt 68 1.3.2.2 yamt if ((bus_space_read_4(iot, ioh, 69 1.3.2.2 yamt BCM2835_MBOX0_STATUS) & BCM2835_MBOX_STATUS_EMPTY) != 0) 70 1.3.2.2 yamt continue; 71 1.3.2.2 yamt 72 1.3.2.2 yamt mbox = bus_space_read_4(iot, ioh, BCM2835_MBOX0_READ); 73 1.3.2.2 yamt 74 1.3.2.2 yamt rchan = BCM2835_MBOX_CHAN(mbox); 75 1.3.2.2 yamt rdata = BCM2835_MBOX_DATA(mbox); 76 1.3.2.2 yamt 77 1.3.2.2 yamt if (rchan == chan) { 78 1.3.2.2 yamt *data = rdata; 79 1.3.2.2 yamt return; 80 1.3.2.2 yamt } 81 1.3.2.2 yamt } 82 1.3.2.2 yamt } 83 1.3.2.2 yamt 84 1.3.2.2 yamt void 85 1.3.2.2 yamt bcm2835_mbox_write(bus_space_tag_t iot, bus_space_handle_t ioh, uint8_t chan, 86 1.3.2.2 yamt uint32_t data) 87 1.3.2.2 yamt { 88 1.3.2.2 yamt uint32_t rdata; 89 1.3.2.2 yamt 90 1.3.2.2 yamt KASSERT((chan & 0xf) == chan); 91 1.3.2.2 yamt KASSERT((data & 0xf) == 0); 92 1.3.2.2 yamt for (;;) { 93 1.3.2.2 yamt 94 1.3.2.2 yamt bus_space_barrier(iot, ioh, 0, BCM2835_MBOX_SIZE, 95 1.3.2.2 yamt BUS_SPACE_BARRIER_READ); 96 1.3.2.2 yamt 97 1.3.2.2 yamt if ((rdata = bus_space_read_4(iot, ioh, 98 1.3.2.2 yamt BCM2835_MBOX0_STATUS) & BCM2835_MBOX_STATUS_FULL) == 0) 99 1.3.2.2 yamt break; 100 1.3.2.2 yamt } 101 1.3.2.2 yamt 102 1.3.2.2 yamt bus_space_write_4(iot, ioh, BCM2835_MBOX1_WRITE, 103 1.3.2.2 yamt BCM2835_MBOX_MSG(chan, data)); 104 1.3.2.2 yamt 105 1.3.2.2 yamt bus_space_barrier(iot, ioh, 0, BCM2835_MBOX_SIZE, 106 1.3.2.2 yamt BUS_SPACE_BARRIER_WRITE); 107 1.3.2.2 yamt } 108
Indexes created Sun Oct 12 09:09:55 GMT 2025