diff options
Diffstat (limited to 'sys/mips/mediatek/mtk_reset.c')
-rw-r--r-- | sys/mips/mediatek/mtk_reset.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/sys/mips/mediatek/mtk_reset.c b/sys/mips/mediatek/mtk_reset.c new file mode 100644 index 0000000..31d56e4 --- /dev/null +++ b/sys/mips/mediatek/mtk_reset.c @@ -0,0 +1,139 @@ +/*- + * Copyright (c) 2016 Stanislav Galabov + * 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, + * without modification, immediately at the beginning of the file. + * 2. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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/kernel.h> +#include <sys/bus.h> +#include <sys/module.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 <mips/mediatek/fdt_reset.h> +#include <mips/mediatek/mtk_sysctl.h> + +#include "fdt_reset_if.h" + +static const struct ofw_compat_data compat_data[] = { + { "ralink,rt2880-reset", 1 }, + + /* Sentinel */ + { NULL, 0 } +}; + +static int +mtk_reset_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) + return (ENXIO); + + device_set_desc(dev, "MTK Reset Controller"); + + return (0); +} + +static int +mtk_reset_attach(device_t dev) +{ + + if (device_get_unit(dev) != 0) { + device_printf(dev, "Only one reset control allowed\n"); + return (ENXIO); + } + + fdt_reset_register_provider(dev); + + return (0); +} + +#define RESET_ASSERT 1 +#define RESET_DEASSERT 0 + +static int +mtk_reset_set(device_t dev, int index, int value) +{ + uint32_t mask; + + /* index 0 is SoC reset, indices 1 - 31 are valid peripheral resets */ + if (index < 1 || index > 31) + return (EINVAL); + + mask = (1u << index); + + if (value == RESET_ASSERT) + mtk_sysctl_clr_set(SYSCTL_RSTCTRL, 0, mask); + else + mtk_sysctl_clr_set(SYSCTL_RSTCTRL, mask, 0); + + return (0); +} + +static int +mtk_reset_assert(device_t dev, int index) +{ + + return mtk_reset_set(dev, index, RESET_ASSERT); +} + +static int +mtk_reset_deassert(device_t dev, int index) +{ + + return mtk_reset_set(dev, index, RESET_DEASSERT); +} + +static device_method_t mtk_reset_methods[] = { + DEVMETHOD(device_probe, mtk_reset_probe), + DEVMETHOD(device_attach, mtk_reset_attach), + + /* fdt_reset interface */ + DEVMETHOD(fdt_reset_assert, mtk_reset_assert), + DEVMETHOD(fdt_reset_deassert, mtk_reset_deassert), + + DEVMETHOD_END +}; + +static driver_t mtk_reset_driver = { + "rstctrl", + mtk_reset_methods, + 0, +}; +static devclass_t mtk_reset_devclass; + +EARLY_DRIVER_MODULE(mtk_reset, simplebus, mtk_reset_driver, mtk_reset_devclass, + 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_EARLY); + +MODULE_DEPEND(mtk_reset, mtk_sysctl, 1, 1, 1); |