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/*-
* 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);
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