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