1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 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 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX) 29 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 #include <sys/malloc.h> 41 #include <sys/rman.h> 42 #include <sys/timeet.h> 43 #include <sys/timetc.h> 44 #include <sys/watchdog.h> 45 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/openfirm.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include <machine/bus.h> 52 #include <machine/cpu.h> 53 #include <machine/intr.h> 54 55 #include <arm/freescale/vybrid/vf_common.h> 56 #include <arm/freescale/vybrid/vf_dmamux.h> 57 58 #define DMAMUX_CHCFG(n) (0x1 * n) /* Channels 0-15 Cfg Reg */ 59 #define CHCFG_ENBL (1 << 7) /* Channel Enable */ 60 #define CHCFG_TRIG (1 << 6) /* Channel Trigger Enable */ 61 #define CHCFG_SOURCE_MASK 0x3f /* Channel Source (Slot) */ 62 #define CHCFG_SOURCE_SHIFT 0 63 64 struct dmamux_softc { 65 struct resource *res[4]; 66 bus_space_tag_t bst[4]; 67 bus_space_handle_t bsh[4]; 68 }; 69 70 struct dmamux_softc *dmamux_sc; 71 72 static struct resource_spec dmamux_spec[] = { 73 { SYS_RES_MEMORY, 0, RF_ACTIVE }, /* DMAMUX0 */ 74 { SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DMAMUX1 */ 75 { SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DMAMUX2 */ 76 { SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DMAMUX3 */ 77 { -1, 0 } 78 }; 79 80 static int 81 dmamux_probe(device_t dev) 82 { 83 84 if (!ofw_bus_status_okay(dev)) 85 return (ENXIO); 86 87 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux")) 88 return (ENXIO); 89 90 device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer"); 91 return (BUS_PROBE_DEFAULT); 92 } 93 94 int 95 dmamux_configure(int mux, int source, int channel, int enable) 96 { 97 struct dmamux_softc *sc; 98 int reg; 99 100 sc = dmamux_sc; 101 102 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0); 103 104 reg = 0; 105 if (enable) 106 reg |= (CHCFG_ENBL); 107 108 reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT); 109 reg |= (source << CHCFG_SOURCE_SHIFT); 110 111 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg); 112 113 return (0); 114 } 115 116 static int 117 dmamux_attach(device_t dev) 118 { 119 struct dmamux_softc *sc; 120 int i; 121 122 sc = device_get_softc(dev); 123 124 if (bus_alloc_resources(dev, dmamux_spec, sc->res)) { 125 device_printf(dev, "could not allocate resources\n"); 126 return (ENXIO); 127 } 128 129 /* Memory interface */ 130 for (i = 0; i < 4; i++) { 131 sc->bst[i] = rman_get_bustag(sc->res[i]); 132 sc->bsh[i] = rman_get_bushandle(sc->res[i]); 133 } 134 135 dmamux_sc = sc; 136 137 return (0); 138 } 139 140 static device_method_t dmamux_methods[] = { 141 DEVMETHOD(device_probe, dmamux_probe), 142 DEVMETHOD(device_attach, dmamux_attach), 143 { 0, 0 } 144 }; 145 146 static driver_t dmamux_driver = { 147 "dmamux", 148 dmamux_methods, 149 sizeof(struct dmamux_softc), 150 }; 151 152 static devclass_t dmamux_devclass; 153 154 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0); 155