1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX) 31 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/bus.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/malloc.h> 43 #include <sys/rman.h> 44 #include <sys/timeet.h> 45 #include <sys/timetc.h> 46 #include <sys/watchdog.h> 47 48 #include <dev/ofw/openfirm.h> 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 52 #include <machine/bus.h> 53 #include <machine/cpu.h> 54 #include <machine/intr.h> 55 56 #include <arm/freescale/vybrid/vf_common.h> 57 #include <arm/freescale/vybrid/vf_dmamux.h> 58 59 #define DMAMUX_CHCFG(n) (0x1 * n) /* Channels 0-15 Cfg Reg */ 60 #define CHCFG_ENBL (1 << 7) /* Channel Enable */ 61 #define CHCFG_TRIG (1 << 6) /* Channel Trigger Enable */ 62 #define CHCFG_SOURCE_MASK 0x3f /* Channel Source (Slot) */ 63 #define CHCFG_SOURCE_SHIFT 0 64 65 struct dmamux_softc { 66 struct resource *res[4]; 67 bus_space_tag_t bst[4]; 68 bus_space_handle_t bsh[4]; 69 }; 70 71 struct dmamux_softc *dmamux_sc; 72 73 static struct resource_spec dmamux_spec[] = { 74 { SYS_RES_MEMORY, 0, RF_ACTIVE }, /* DMAMUX0 */ 75 { SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DMAMUX1 */ 76 { SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DMAMUX2 */ 77 { SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DMAMUX3 */ 78 { -1, 0 } 79 }; 80 81 static int 82 dmamux_probe(device_t dev) 83 { 84 85 if (!ofw_bus_status_okay(dev)) 86 return (ENXIO); 87 88 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux")) 89 return (ENXIO); 90 91 device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer"); 92 return (BUS_PROBE_DEFAULT); 93 } 94 95 int 96 dmamux_configure(int mux, int source, int channel, int enable) 97 { 98 struct dmamux_softc *sc; 99 int reg; 100 101 sc = dmamux_sc; 102 103 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0); 104 105 reg = 0; 106 if (enable) 107 reg |= (CHCFG_ENBL); 108 109 reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT); 110 reg |= (source << CHCFG_SOURCE_SHIFT); 111 112 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg); 113 114 return (0); 115 } 116 117 static int 118 dmamux_attach(device_t dev) 119 { 120 struct dmamux_softc *sc; 121 int i; 122 123 sc = device_get_softc(dev); 124 125 if (bus_alloc_resources(dev, dmamux_spec, sc->res)) { 126 device_printf(dev, "could not allocate resources\n"); 127 return (ENXIO); 128 } 129 130 /* Memory interface */ 131 for (i = 0; i < 4; i++) { 132 sc->bst[i] = rman_get_bustag(sc->res[i]); 133 sc->bsh[i] = rman_get_bushandle(sc->res[i]); 134 } 135 136 dmamux_sc = sc; 137 138 return (0); 139 } 140 141 static device_method_t dmamux_methods[] = { 142 DEVMETHOD(device_probe, dmamux_probe), 143 DEVMETHOD(device_attach, dmamux_attach), 144 { 0, 0 } 145 }; 146 147 static driver_t dmamux_driver = { 148 "dmamux", 149 dmamux_methods, 150 sizeof(struct dmamux_softc), 151 }; 152 153 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, 0, 0); 154