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