diff options
Diffstat (limited to 'sys/arm/freescale/imx/imx6_audmux.c')
| -rw-r--r-- | sys/arm/freescale/imx/imx6_audmux.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_audmux.c b/sys/arm/freescale/imx/imx6_audmux.c new file mode 100644 index 000000000000..61ec0b6da510 --- /dev/null +++ b/sys/arm/freescale/imx/imx6_audmux.c @@ -0,0 +1,157 @@ +/*- + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * i.MX6 Digital Audio Multiplexer (AUDMUX) + * Chapter 16, i.MX 6Dual/6Quad Applications Processor Reference Manual, + * Rev. 1, 04/2013 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/malloc.h> +#include <sys/endian.h> +#include <sys/rman.h> +#include <sys/timeet.h> +#include <sys/timetc.h> + +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <machine/bus.h> +#include <machine/cpu.h> +#include <machine/intr.h> + +#define READ4(_sc, _reg) \ + bus_space_read_4(_sc->bst, _sc->bsh, _reg) +#define WRITE4(_sc, _reg, _val) \ + bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val) + +#define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */ +#define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */ +#define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */ +#define PTCR_TFSEL_M 0xf +#define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */ +#define PTCR_TCSEL_S 22 /* Transmit Clock Select. */ +#define PTCR_TCSEL_M 0xf +#define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */ +#define PTCR_SYN (1 << 11) +#define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */ +#define PDCR_RXDSEL_S 13 /* Receive Data Select */ +#define PDCR_RXDSEL_M 0x3 +#define PDCR_RXDSEL_PORT(n) (n - 1) + +struct audmux_softc { + struct resource *res[1]; + bus_space_tag_t bst; + bus_space_handle_t bsh; + void *ih; +}; + +static struct resource_spec audmux_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { -1, 0 } +}; + +static int +audmux_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux")) + return (ENXIO); + + device_set_desc(dev, "i.MX6 Digital Audio Multiplexer"); + return (BUS_PROBE_DEFAULT); +} + +static int +audmux_configure(struct audmux_softc *sc, + int ssi_port, int audmux_port) +{ + uint32_t reg; + + /* Direction: output */ + reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN); + WRITE4(sc, AUDMUX_PTCR(audmux_port), reg); + + /* Select source */ + reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S); + WRITE4(sc, AUDMUX_PDCR(audmux_port), reg); + + return (0); +} + +static int +audmux_attach(device_t dev) +{ + struct audmux_softc *sc; + + sc = device_get_softc(dev); + + if (bus_alloc_resources(dev, audmux_spec, sc->res)) { + device_printf(dev, "could not allocate resources\n"); + return (ENXIO); + } + + /* Memory interface */ + sc->bst = rman_get_bustag(sc->res[0]); + sc->bsh = rman_get_bushandle(sc->res[0]); + + /* + * Direct SSI1 output to AUDMUX5 pins. + * TODO: dehardcore this. + */ + audmux_configure(sc, 1, 5); + + return (0); +}; + +static device_method_t audmux_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, audmux_probe), + DEVMETHOD(device_attach, audmux_attach), + { 0, 0 } +}; + +static driver_t audmux_driver = { + "audmux", + audmux_methods, + sizeof(struct audmux_softc), +}; + +static devclass_t audmux_devclass; + +DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0); |