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      1 /* $NetBSD: qemufwcfg_fdt.c,v 1.2 2021/01/27 03:10:21 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_fdt.c,v 1.2 2021/01/27 03:10:21 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/fdt/fdtvar.h>
     39 
     40 #include <dev/ic/qemufwcfgvar.h>
     41 
     42 static int	fwcfg_fdt_match(device_t, cfdata_t, void *);
     43 static void	fwcfg_fdt_attach(device_t, device_t, void *);
     44 
     45 CFATTACH_DECL_NEW(qemufwcfg_fdt, sizeof(struct fwcfg_softc),
     46     fwcfg_fdt_match,
     47     fwcfg_fdt_attach,
     48     NULL,
     49     NULL
     50 );
     51 
     52 static const struct device_compatible_entry compat_data[] = {
     53 	{ .compat = "qemu,fw-cfg-mmio" },
     54 	DEVICE_COMPAT_EOL
     55 };
     56 
     57 
     58 static int
     59 fwcfg_fdt_match(device_t parent, cfdata_t match, void *opaque)
     60 {
     61 	struct fdt_attach_args * const faa = opaque;
     62 
     63 	return of_compatible_match(faa->faa_phandle, compat_data);
     64 }
     65 
     66 static void
     67 fwcfg_fdt_attach(device_t parent, device_t self, void *opaque)
     68 {
     69 	struct fwcfg_softc *sc = device_private(self);
     70 	struct fdt_attach_args * const faa = opaque;
     71 	bus_addr_t base;
     72 	bus_size_t size;
     73 
     74 	if (fdtbus_get_reg(faa->faa_phandle, 0, &base, &size) != 0) {
     75 		aprint_error_dev(self, "couldn't get registers\n");
     76 		return;
     77 	}
     78 
     79 	sc->sc_dev = self;
     80 	sc->sc_bst = faa->faa_bst;
     81 
     82 	if (bus_space_map(sc->sc_bst, base, size, 0, &sc->sc_bsh) != 0) {
     83 		aprint_error_dev(self, "couldn't map registers\n");
     84 		return;
     85 	}
     86 
     87 	aprint_naive("\n");
     88 	aprint_normal("\n");
     89 
     90 	fwcfg_attach(sc);
     91 
     92 	pmf_device_register(self, NULL, NULL);
     93 }
     94