diff options
Diffstat (limited to 'freebsd/sys/arm/ti/am335x/am335x_pwmss.c')
| -rw-r--r-- | freebsd/sys/arm/ti/am335x/am335x_pwmss.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/freebsd/sys/arm/ti/am335x/am335x_pwmss.c b/freebsd/sys/arm/ti/am335x/am335x_pwmss.c new file mode 100644 index 00000000..f9249989 --- /dev/null +++ b/freebsd/sys/arm/ti/am335x/am335x_pwmss.c @@ -0,0 +1,165 @@ +#include <machine/rtems-bsd-kernel-space.h> + +/*- + * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org> + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <rtems/bsd/sys/resource.h> +#include <sys/rman.h> +#include <sys/sysctl.h> + +#include <machine/bus.h> + +#include <dev/fdt/simplebus.h> +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/ti/ti_prcm.h> +#include <arm/ti/ti_hwmods.h> +#include <arm/ti/ti_scm.h> + +#include "am335x_pwm.h" +#include "am335x_scm.h" + +#define PWMSS_IDVER 0x00 +#define PWMSS_SYSCONFIG 0x04 +#define PWMSS_CLKCONFIG 0x08 +#define CLKCONFIG_EPWMCLK_EN (1 << 8) +#define PWMSS_CLKSTATUS 0x0C + +static device_probe_t am335x_pwmss_probe; +static device_attach_t am335x_pwmss_attach; +static device_detach_t am335x_pwmss_detach; + +struct am335x_pwmss_softc { + struct simplebus_softc sc_simplebus; + device_t sc_dev; + clk_ident_t sc_clk; +}; + +static device_method_t am335x_pwmss_methods[] = { + DEVMETHOD(device_probe, am335x_pwmss_probe), + DEVMETHOD(device_attach, am335x_pwmss_attach), + DEVMETHOD(device_detach, am335x_pwmss_detach), + + DEVMETHOD_END +}; + +static int +am335x_pwmss_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss")) + return (ENXIO); + + device_set_desc(dev, "AM335x PWM"); + + return (BUS_PROBE_DEFAULT); +} + +static int +am335x_pwmss_attach(device_t dev) +{ + struct am335x_pwmss_softc *sc; + uint32_t reg, id; + phandle_t node; + + sc = device_get_softc(dev); + sc->sc_dev = dev; + + sc->sc_clk = ti_hwmods_get_clock(dev); + if (sc->sc_clk == INVALID_CLK_IDENT) { + device_printf(dev, "failed to get device id based on ti,hwmods\n"); + return (EINVAL); + } + + ti_prcm_clk_enable(sc->sc_clk); + ti_scm_reg_read_4(SCM_PWMSS_CTRL, ®); + switch (sc->sc_clk) { + case PWMSS0_CLK: + id = 0; + break; + case PWMSS1_CLK: + id = 1; + break; + + case PWMSS2_CLK: + id = 2; + break; + default: + device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk); + return (EINVAL); + } + reg |= (1 << id); + ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg); + + node = ofw_bus_get_node(dev); + + if (node == -1) + return (ENXIO); + + simplebus_init(dev, node); + + /* + * Allow devices to identify. + */ + bus_generic_probe(dev); + + /* + * Now walk the OFW tree and attach top-level devices. + */ + for (node = OF_child(node); node > 0; node = OF_peer(node)) + simplebus_add_device(dev, node, 0, NULL, -1, NULL); + + return (bus_generic_attach(dev)); +} + +static int +am335x_pwmss_detach(device_t dev) +{ + + return (0); +} + +DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods, + sizeof(struct am335x_pwmss_softc), simplebus_driver); +static devclass_t am335x_pwmss_devclass; +DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0); +MODULE_VERSION(am335x_pwmss, 1); |