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 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/malloc.h> 42 #include <sys/endian.h> 43 #include <sys/rman.h> 44 #include <sys/timeet.h> 45 #include <sys/timetc.h> 46 47 #include <dev/fdt/fdt_common.h> 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 #define READ4(_sc, _reg) \ 57 bus_space_read_4(_sc->bst, _sc->bsh, _reg) 58 #define WRITE4(_sc, _reg, _val) \ 59 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val) 60 61 #define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */ 62 #define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */ 63 #define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */ 64 #define PTCR_TFSEL_M 0xf 65 #define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */ 66 #define PTCR_TCSEL_S 22 /* Transmit Clock Select. */ 67 #define PTCR_TCSEL_M 0xf 68 #define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */ 69 #define PTCR_SYN (1 << 11) 70 #define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */ 71 #define PDCR_RXDSEL_S 13 /* Receive Data Select */ 72 #define PDCR_RXDSEL_M 0x3 73 #define PDCR_RXDSEL_PORT(n) (n - 1) 74 75 struct audmux_softc { 76 struct resource *res[1]; 77 bus_space_tag_t bst; 78 bus_space_handle_t bsh; 79 void *ih; 80 }; 81 82 static struct resource_spec audmux_spec[] = { 83 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 84 { -1, 0 } 85 }; 86 87 static int 88 audmux_probe(device_t dev) 89 { 90 91 if (!ofw_bus_status_okay(dev)) 92 return (ENXIO); 93 94 if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux")) 95 return (ENXIO); 96 97 device_set_desc(dev, "i.MX6 Digital Audio Multiplexer"); 98 return (BUS_PROBE_DEFAULT); 99 } 100 101 static int 102 audmux_configure(struct audmux_softc *sc, 103 int ssi_port, int audmux_port) 104 { 105 uint32_t reg; 106 107 /* Direction: output */ 108 reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN); 109 WRITE4(sc, AUDMUX_PTCR(audmux_port), reg); 110 111 /* Select source */ 112 reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S); 113 WRITE4(sc, AUDMUX_PDCR(audmux_port), reg); 114 115 return (0); 116 } 117 118 static int 119 audmux_attach(device_t dev) 120 { 121 struct audmux_softc *sc; 122 123 sc = device_get_softc(dev); 124 125 if (bus_alloc_resources(dev, audmux_spec, sc->res)) { 126 device_printf(dev, "could not allocate resources\n"); 127 return (ENXIO); 128 } 129 130 /* Memory interface */ 131 sc->bst = rman_get_bustag(sc->res[0]); 132 sc->bsh = rman_get_bushandle(sc->res[0]); 133 134 /* 135 * Direct SSI1 output to AUDMUX5 pins. 136 * TODO: dehardcore this. 137 */ 138 audmux_configure(sc, 1, 5); 139 140 return (0); 141 }; 142 143 static device_method_t audmux_methods[] = { 144 /* Device interface */ 145 DEVMETHOD(device_probe, audmux_probe), 146 DEVMETHOD(device_attach, audmux_attach), 147 { 0, 0 } 148 }; 149 150 static driver_t audmux_driver = { 151 "audmux", 152 audmux_methods, 153 sizeof(struct audmux_softc), 154 }; 155 156 static devclass_t audmux_devclass; 157 158 DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0); 159