xref: /src/sys/dev/fdt/dwcwdt_fdt.c

/* $NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $ */

/*-
 * Copyright (c) 2018, 2023 Jared McNeill <jmcneill@invisible.ca>
 * 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 ``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 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>
__KERNEL_RCSID(0, "$NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/wdog.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/ic/dwc_wdt_var.h>

#include <dev/fdt/fdtvar.h>

static const struct device_compatible_entry compat_data[] = {
	{ .compat = "snps,dw-wdt" },
	DEVICE_COMPAT_EOL
};

static int
dwcwdt_fdt_match(device_t parent, cfdata_t cf, void *aux)
{
	struct fdt_attach_args * const faa = aux;

	return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
dwcwdt_fdt_attach(device_t parent, device_t self, void *aux)
{
	struct dwcwdt_softc * const sc = device_private(self);
	struct fdt_attach_args * const faa = aux;
	const int phandle = faa->faa_phandle;
	struct fdtbus_reset *rst;
	struct clk *clk;
	bus_addr_t addr;
	bus_size_t size;

	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
		aprint_error(": couldn't get registers\n");
		return;
	}

	clk = fdtbus_clock_get_index(phandle, 0);
	if (clk == NULL || clk_enable(clk) != 0) {
		aprint_error(": couldn't enable clock\n");
		return;
	}
	rst = fdtbus_reset_get_index(phandle, 0);
	if (rst && fdtbus_reset_assert(rst) != 0) {
		aprint_error(": couldn't assert reset\n");
		return;
	}
	if (rst && fdtbus_reset_deassert(rst) != 0) {
		aprint_error(": couldn't de-assert reset\n");
		return;
	}

	sc->sc_dev = self;
	sc->sc_bst = faa->faa_bst;
	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
		aprint_error(": couldn't map registers\n");
		return;
	}
	sc->sc_clkrate = clk_get_rate(clk);

	aprint_naive("\n");
	aprint_normal(": DesignWare Watchdog Timer\n");

	dwcwdt_init(sc);
}

CFATTACH_DECL_NEW(dwcwdt_fdt, sizeof(struct dwcwdt_softc),
	dwcwdt_fdt_match, dwcwdt_fdt_attach, NULL, NULL);