diff options
Diffstat (limited to 'freebsd/sys/arm/ti/ti_scm.c')
| -rw-r--r-- | freebsd/sys/arm/ti/ti_scm.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/freebsd/sys/arm/ti/ti_scm.c b/freebsd/sys/arm/ti/ti_scm.c new file mode 100644 index 00000000..2e54262e --- /dev/null +++ b/freebsd/sys/arm/ti/ti_scm.c @@ -0,0 +1,176 @@ +#include <machine/rtems-bsd-kernel-space.h> + +/* + * Copyright (c) 2010 + * Ben Gray <ben.r.gray@gmail.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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Ben Gray. + * 4. The name of the company nor the name of the author may be used to + * endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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. + */ + +/** + * SCM - System Control Module + * + * Hopefully in the end this module will contain a bunch of utility functions + * for configuring and querying the general system control registers, but for + * now it only does pin(pad) multiplexing. + * + * This is different from the GPIO module in that it is used to configure the + * pins between modules not just GPIO input/output. + * + * This file contains the generic top level driver, however it relies on chip + * specific settings and therefore expects an array of ti_scm_padconf structs + * call ti_padconf_devmap to be located somewhere in the kernel. + * + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <rtems/bsd/sys/resource.h> +#include <sys/rman.h> +#include <sys/lock.h> +#include <sys/mutex.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> +#include <dev/fdt/fdt_pinctrl.h> + +#include "ti_scm.h" + +static struct resource_spec ti_scm_res_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */ + { -1, 0 } +}; + +static struct ti_scm_softc *ti_scm_sc; + +#define ti_scm_read_4(sc, reg) \ + bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) +#define ti_scm_write_4(sc, reg, val) \ + bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) + +/* + * Device part of OMAP SCM driver + */ +static int +ti_scm_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "syscon")) + return (ENXIO); + + if (ti_scm_sc) { + return (EEXIST); + } + + device_set_desc(dev, "TI Control Module"); + return (BUS_PROBE_DEFAULT); +} + +/** + * ti_scm_attach - attaches the timer to the simplebus + * @dev: new device + * + * Reserves memory and interrupt resources, stores the softc structure + * globally and registers both the timecount and eventtimer objects. + * + * RETURNS + * Zero on success or ENXIO if an error occuried. + */ +static int +ti_scm_attach(device_t dev) +{ + struct ti_scm_softc *sc = device_get_softc(dev); + + sc->sc_dev = dev; + + if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) { + device_printf(dev, "could not allocate resources\n"); + return (ENXIO); + } + + /* Global timer interface */ + sc->sc_bst = rman_get_bustag(sc->sc_res[0]); + sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]); + + ti_scm_sc = sc; + + /* Attach platform extensions, if any. */ + bus_generic_probe(dev); + + return (bus_generic_attach(dev)); +} + +int +ti_scm_reg_read_4(uint32_t reg, uint32_t *val) +{ + if (!ti_scm_sc) + return (ENXIO); + + *val = ti_scm_read_4(ti_scm_sc, reg); + return (0); +} + +int +ti_scm_reg_write_4(uint32_t reg, uint32_t val) +{ + if (!ti_scm_sc) + return (ENXIO); + + ti_scm_write_4(ti_scm_sc, reg, val); + return (0); +} + + +static device_method_t ti_scm_methods[] = { + DEVMETHOD(device_probe, ti_scm_probe), + DEVMETHOD(device_attach, ti_scm_attach), + + { 0, 0 } +}; + +static driver_t ti_scm_driver = { + "ti_scm", + ti_scm_methods, + sizeof(struct ti_scm_softc), +}; + +static devclass_t ti_scm_devclass; + +EARLY_DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0, + BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); |