1 /*- 2 * Copyright (c) 2015 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 * i.MX6 Digital Audio Multiplexer (AUDMUX) 29 * Chapter 16, i.MX 6Dual/6Quad Applications Processor Reference Manual, 30 * Rev. 1, 04/2013 31 */ 32 33 #include <sys/cdefs.h> 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/malloc.h> 40 #include <sys/endian.h> 41 #include <sys/rman.h> 42 #include <sys/timeet.h> 43 #include <sys/timetc.h> 44 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 #include <machine/intr.h> 52 53 #define READ4(_sc, _reg) \ 54 bus_space_read_4(_sc->bst, _sc->bsh, _reg) 55 #define WRITE4(_sc, _reg, _val) \ 56 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val) 57 58 #define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */ 59 #define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */ 60 #define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */ 61 #define PTCR_TFSEL_M 0xf 62 #define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */ 63 #define PTCR_TCSEL_S 22 /* Transmit Clock Select. */ 64 #define PTCR_TCSEL_M 0xf 65 #define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */ 66 #define PTCR_SYN (1 << 11) 67 #define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */ 68 #define PDCR_RXDSEL_S 13 /* Receive Data Select */ 69 #define PDCR_RXDSEL_M 0x3 70 #define PDCR_RXDSEL_PORT(n) (n - 1) 71 72 struct audmux_softc { 73 struct resource *res[1]; 74 bus_space_tag_t bst; 75 bus_space_handle_t bsh; 76 void *ih; 77 }; 78 79 static struct resource_spec audmux_spec[] = { 80 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 81 { -1, 0 } 82 }; 83 84 static int 85 audmux_probe(device_t dev) 86 { 87 88 if (!ofw_bus_status_okay(dev)) 89 return (ENXIO); 90 91 if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux")) 92 return (ENXIO); 93 94 device_set_desc(dev, "i.MX6 Digital Audio Multiplexer"); 95 return (BUS_PROBE_DEFAULT); 96 } 97 98 static int 99 audmux_configure(struct audmux_softc *sc, 100 int ssi_port, int audmux_port) 101 { 102 uint32_t reg; 103 104 /* Direction: output */ 105 reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN); 106 WRITE4(sc, AUDMUX_PTCR(audmux_port), reg); 107 108 /* Select source */ 109 reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S); 110 WRITE4(sc, AUDMUX_PDCR(audmux_port), reg); 111 112 return (0); 113 } 114 115 static int 116 audmux_attach(device_t dev) 117 { 118 struct audmux_softc *sc; 119 120 sc = device_get_softc(dev); 121 122 if (bus_alloc_resources(dev, audmux_spec, sc->res)) { 123 device_printf(dev, "could not allocate resources\n"); 124 return (ENXIO); 125 } 126 127 /* Memory interface */ 128 sc->bst = rman_get_bustag(sc->res[0]); 129 sc->bsh = rman_get_bushandle(sc->res[0]); 130 131 /* 132 * Direct SSI1 output to AUDMUX5 pins. 133 * TODO: dehardcore this. 134 */ 135 audmux_configure(sc, 1, 5); 136 137 return (0); 138 }; 139 140 static device_method_t audmux_methods[] = { 141 /* Device interface */ 142 DEVMETHOD(device_probe, audmux_probe), 143 DEVMETHOD(device_attach, audmux_attach), 144 { 0, 0 } 145 }; 146 147 static driver_t audmux_driver = { 148 "audmux", 149 audmux_methods, 150 sizeof(struct audmux_softc), 151 }; 152 153 DRIVER_MODULE(audmux, simplebus, audmux_driver, 0, 0); 154