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      1 /* $NetBSD: dwcwdt_acpi.c,v 1.1 2023/04/16 16:55:01 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 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_acpi.c,v 1.1 2023/04/16 16:55:01 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/acpi/acpireg.h>
     44 #include <dev/acpi/acpivar.h>
     45 
     46 static const struct device_compatible_entry compat_data[] = {
     47 	{ .compat = "snps,dw-wdt" },
     48 	DEVICE_COMPAT_EOL
     49 };
     50 
     51 static int
     52 dwcwdt_acpi_match(device_t parent, cfdata_t cf, void *aux)
     53 {
     54 	struct acpi_attach_args *aa = aux;
     55 
     56 	return acpi_compatible_match(aa, compat_data);
     57 }
     58 
     59 static void
     60 dwcwdt_acpi_attach(device_t parent, device_t self, void *aux)
     61 {
     62 	struct dwcwdt_softc * const sc = device_private(self);
     63 	struct acpi_attach_args *aa = aux;
     64 	ACPI_HANDLE handle = aa->aa_node->ad_handle;
     65 	struct acpi_resources res;
     66 	struct acpi_mem *mem;
     67 	ACPI_INTEGER ival;
     68 	ACPI_STATUS rv;
     69 
     70 	rv = acpi_resource_parse(sc->sc_dev, handle, "_CRS",
     71 	    &res, &acpi_resource_parse_ops_default);
     72 	if (ACPI_FAILURE(rv)) {
     73 		return;
     74 	}
     75 
     76 	mem = acpi_res_mem(&res, 0);
     77 	if (mem == NULL) {
     78 		aprint_error_dev(self, "couldn't find mem resource\n");
     79 		goto done;
     80 	}
     81 
     82 	sc->sc_dev = self;
     83 	sc->sc_bst = aa->aa_memt;
     84 	if (bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length,
     85 	    0, &sc->sc_bsh) != 0) {
     86 		aprint_error_dev(self, "couldn't map registers\n");
     87 		goto done;
     88 	}
     89 	if (ACPI_SUCCESS(acpi_dsd_integer(handle, "clock-frequency", &ival))) {
     90 		sc->sc_clkrate = ival;
     91 	}
     92 
     93 	dwcwdt_init(sc);
     94 
     95 done:
     96 	acpi_resource_cleanup(&res);
     97 }
     98 
     99 CFATTACH_DECL_NEW(dwcwdt_acpi, sizeof(struct dwcwdt_softc),
    100     dwcwdt_acpi_match, dwcwdt_acpi_attach, NULL, NULL);
    101