freebsd-dev/sys/mips/mediatek/mtk_reset.c
Stanislav Galabov b74b6b0a82 Initial import of Ralink/Mediatek MIPS SoC support #2
This revision adds the following to the Mediatek/Ralink support:

- initial support for "clocks" FDT property, currently based on fdt_clock
- initial support for "resets" FDT property, currently based on the
  fdt_reset interface from D5826
- initial support for "pinctrl,bits" functionality via FDT. May be extended
  in the future to cover a better and fuller pinctrl implementation

Approved by:	adrian (mentor)
Sponsored by:	Smartcom - Bulgaria AD
Differential Revision:	https://reviews.freebsd.org/D5827
2016-04-07 11:08:50 +00:00

140 lines
3.4 KiB
C

/*-
* 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);