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      1 /* $NetBSD: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 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: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/device.h>
     34 #include <sys/systm.h>
     35 #include <sys/mutex.h>
     36 #include <sys/bus.h>
     37 
     38 #include <dev/acpi/acpireg.h>
     39 #include <dev/acpi/acpivar.h>
     40 
     41 #include <dev/ic/qemufwcfgvar.h>
     42 
     43 #define _COMPONENT	ACPI_RESOURCE_COMPONENT
     44 ACPI_MODULE_NAME	("qemufwcfg_acpi")
     45 
     46 static int	fwcfg_acpi_match(device_t, cfdata_t, void *);
     47 static void	fwcfg_acpi_attach(device_t, device_t, void *);
     48 
     49 CFATTACH_DECL_NEW(qemufwcfg_acpi, sizeof(struct fwcfg_softc),
     50     fwcfg_acpi_match,
     51     fwcfg_acpi_attach,
     52     NULL,
     53     NULL
     54 );
     55 
     56 static const struct device_compatible_entry compat_data[] = {
     57 	{ .compat = "QEMU0002" },
     58 	DEVICE_COMPAT_EOL
     59 };
     60 
     61 static int
     62 fwcfg_acpi_match(device_t parent, cfdata_t match, void *opaque)
     63 {
     64 	struct acpi_attach_args *aa = opaque;
     65 
     66 	return acpi_compatible_match(aa, compat_data);
     67 }
     68 
     69 static void
     70 fwcfg_acpi_attach(device_t parent, device_t self, void *opaque)
     71 {
     72 	struct fwcfg_softc *sc = device_private(self);
     73 	struct acpi_attach_args *aa = opaque;
     74 	struct acpi_resources res;
     75 	struct acpi_mem *mem;
     76 	struct acpi_io *io;
     77 	bus_addr_t base;
     78 	bus_size_t size;
     79 	ACPI_STATUS rv;
     80 
     81 	rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
     82 	    &res, &acpi_resource_parse_ops_default);
     83 	if (ACPI_FAILURE(rv))
     84 		return;
     85 
     86 	sc->sc_dev = self;
     87 
     88 	if ((io = acpi_res_io(&res, 0)) != NULL) {
     89 		sc->sc_bst = aa->aa_iot;
     90 		base = io->ar_base;
     91 		size = io->ar_length;
     92 	} else if ((mem = acpi_res_mem(&res, 0)) != NULL) {
     93 		sc->sc_bst = aa->aa_memt;
     94 		base = mem->ar_base;
     95 		size = mem->ar_length;
     96 	} else {
     97 		aprint_error_dev(self, "couldn't acquire resources\n");
     98 		return;
     99 	}
    100 	acpi_resource_cleanup(&res);
    101 
    102 	if (bus_space_map(sc->sc_bst, base, size, 0, &sc->sc_bsh) != 0) {
    103 		aprint_error_dev(self, "couldn't map registers\n");
    104 		return;
    105 	}
    106 
    107 	fwcfg_attach(sc);
    108 
    109 	pmf_device_register(self, NULL, NULL);
    110 }
    111