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Diffstat (limited to 'sys/arm/freescale/vybrid/vf_iomuxc.c')
| -rw-r--r-- | sys/arm/freescale/vybrid/vf_iomuxc.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/sys/arm/freescale/vybrid/vf_iomuxc.c b/sys/arm/freescale/vybrid/vf_iomuxc.c new file mode 100644 index 000000000000..e46dd31c2efb --- /dev/null +++ b/sys/arm/freescale/vybrid/vf_iomuxc.c @@ -0,0 +1,212 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2013-2014 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. + */ + +/* + * Vybrid Family Input/Output Multiplexer Controller (IOMUXC) + * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013 + */ + +#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/rman.h> +#include <sys/timeet.h> +#include <sys/timetc.h> +#include <sys/watchdog.h> + +#include <dev/fdt/fdt_common.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> + +#include <arm/freescale/vybrid/vf_iomuxc.h> +#include <arm/freescale/vybrid/vf_common.h> + +#define MUX_MODE_MASK 7 +#define MUX_MODE_SHIFT 20 +#define MUX_MODE_GPIO 0 +#define MUX_MODE_VBUS_EN_OTG 2 + +#define IBE (1 << 0) /* Input Buffer Enable Field */ +#define OBE (1 << 1) /* Output Buffer Enable Field. */ +#define PUE (1 << 2) /* Pull / Keep Select Field. */ +#define PKE (1 << 3) /* Pull / Keep Enable Field. */ +#define HYS (1 << 9) /* Hysteresis Enable Field */ +#define ODE (1 << 10) /* Open Drain Enable Field. */ +#define SRE (1 << 11) /* Slew Rate Field. */ + +#define SPEED_SHIFT 12 +#define SPEED_MASK 0x3 +#define SPEED_LOW 0 /* 50 MHz */ +#define SPEED_MEDIUM 0x1 /* 100 MHz */ +#define SPEED_HIGH 0x3 /* 200 MHz */ + +#define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */ +#define PUS_MASK 0x3 +#define PUS_100_KOHM_PULL_DOWN 0 +#define PUS_47_KOHM_PULL_UP 0x1 +#define PUS_100_KOHM_PULL_UP 0x2 +#define PUS_22_KOHM_PULL_UP 0x3 + +#define DSE_SHIFT 6 /* Drive Strength Field Shift */ +#define DSE_MASK 0x7 +#define DSE_DISABLED 0 /* Output driver disabled */ +#define DSE_150_OHM 0x1 +#define DSE_75_OHM 0x2 +#define DSE_50_OHM 0x3 +#define DSE_37_OHM 0x4 +#define DSE_30_OHM 0x5 +#define DSE_25_OHM 0x6 +#define DSE_20_OHM 0x7 + +#define MAX_MUX_LEN 1024 + +struct iomuxc_softc { + struct resource *tmr_res[1]; + bus_space_tag_t bst; + bus_space_handle_t bsh; + device_t dev; +}; + +static struct resource_spec iomuxc_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { -1, 0 } +}; + +static int +iomuxc_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) + return (ENXIO); + + device_set_desc(dev, "Vybrid Family IOMUXC Unit"); + return (BUS_PROBE_DEFAULT); +} + +static int +pinmux_set(struct iomuxc_softc *sc) +{ + phandle_t child, parent, root; + pcell_t iomux_config[MAX_MUX_LEN]; + int len; + int values; + int pin; + int pin_cfg; + int i; + + root = OF_finddevice("/"); + len = 0; + parent = root; + + /* Find 'iomux_config' prop in the nodes */ + for (child = OF_child(parent); child != 0; child = OF_peer(child)) { + /* Find a 'leaf'. Start the search from this node. */ + while (OF_child(child)) { + parent = child; + child = OF_child(child); + } + + if (!ofw_bus_node_status_okay(child)) + continue; + + if ((len = OF_getproplen(child, "iomux_config")) > 0) { + OF_getencprop(child, "iomux_config", iomux_config, len); + + values = len / (sizeof(uint32_t)); + for (i = 0; i < values; i += 2) { + pin = iomux_config[i]; + pin_cfg = iomux_config[i+1]; +#if 0 + device_printf(sc->dev, "Set pin %d to 0x%08x\n", + pin, pin_cfg); +#endif + WRITE4(sc, IOMUXC(pin), pin_cfg); + } + } + + if (OF_peer(child) == 0) { + /* No more siblings. */ + child = parent; + parent = OF_parent(child); + } + } + + return (0); +} + +static int +iomuxc_attach(device_t dev) +{ + struct iomuxc_softc *sc; + + sc = device_get_softc(dev); + sc->dev = dev; + + if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { + device_printf(dev, "could not allocate resources\n"); + return (ENXIO); + } + + /* Memory interface */ + sc->bst = rman_get_bustag(sc->tmr_res[0]); + sc->bsh = rman_get_bushandle(sc->tmr_res[0]); + + pinmux_set(sc); + + return (0); +} + +static device_method_t iomuxc_methods[] = { + DEVMETHOD(device_probe, iomuxc_probe), + DEVMETHOD(device_attach, iomuxc_attach), + { 0, 0 } +}; + +static driver_t iomuxc_driver = { + "iomuxc", + iomuxc_methods, + sizeof(struct iomuxc_softc), +}; + +static devclass_t iomuxc_devclass; + +DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0); |