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      1 /* $NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018, 2023 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/intr.h>
     36 #include <sys/systm.h>
     37 #include <sys/mutex.h>
     38 #include <sys/wdog.h>
     39 
     40 #include <dev/sysmon/sysmonvar.h>
     41 #include <dev/ic/dwc_wdt_var.h>
     42 
     43 #include <dev/fdt/fdtvar.h>
     44 
     45 static const struct device_compatible_entry compat_data[] = {
     46 	{ .compat = "snps,dw-wdt" },
     47 	DEVICE_COMPAT_EOL
     48 };
     49 
     50 static int
     51 dwcwdt_fdt_match(device_t parent, cfdata_t cf, void *aux)
     52 {
     53 	struct fdt_attach_args * const faa = aux;
     54 
     55 	return of_compatible_match(faa->faa_phandle, compat_data);
     56 }
     57 
     58 static void
     59 dwcwdt_fdt_attach(device_t parent, device_t self, void *aux)
     60 {
     61 	struct dwcwdt_softc * const sc = device_private(self);
     62 	struct fdt_attach_args * const faa = aux;
     63 	const int phandle = faa->faa_phandle;
     64 	struct fdtbus_reset *rst;
     65 	struct clk *clk;
     66 	bus_addr_t addr;
     67 	bus_size_t size;
     68 
     69 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     70 		aprint_error(": couldn't get registers\n");
     71 		return;
     72 	}
     73 
     74 	clk = fdtbus_clock_get_index(phandle, 0);
     75 	if (clk == NULL || clk_enable(clk) != 0) {
     76 		aprint_error(": couldn't enable clock\n");
     77 		return;
     78 	}
     79 	rst = fdtbus_reset_get_index(phandle, 0);
     80 	if (rst && fdtbus_reset_assert(rst) != 0) {
     81 		aprint_error(": couldn't assert reset\n");
     82 		return;
     83 	}
     84 	if (rst && fdtbus_reset_deassert(rst) != 0) {
     85 		aprint_error(": couldn't de-assert reset\n");
     86 		return;
     87 	}
     88 
     89 	sc->sc_dev = self;
     90 	sc->sc_bst = faa->faa_bst;
     91 	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
     92 		aprint_error(": couldn't map registers\n");
     93 		return;
     94 	}
     95 	sc->sc_clkrate = clk_get_rate(clk);
     96 
     97 	aprint_naive("\n");
     98 	aprint_normal(": DesignWare Watchdog Timer\n");
     99 
    100 	dwcwdt_init(sc);
    101 }
    102 
    103 CFATTACH_DECL_NEW(dwcwdt_fdt, sizeof(struct dwcwdt_softc),
    104 	dwcwdt_fdt_match, dwcwdt_fdt_attach, NULL, NULL);
    105