via_pci.c revision 1.3 
1/*	$NetBSD: via_pci.c,v 1.3 2018/08/27 14:12:44 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2015 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: via_pci.c,v 1.3 2018/08/27 14:12:44 riastradh Exp $");
34
35#include <sys/types.h>
36#include <sys/device.h>
37#include <sys/pmf.h>
38#include <sys/systm.h>
39
40#include <linux/pci.h>
41
42#include <drm/drmP.h>
43#include <drm/drm_pciids.h>
44#include <drm/via_drm.h>
45
46#include "via_drv.h"
47
48struct viadrm_softc {
49	device_t		sc_dev;
50	struct pci_dev		sc_pci_dev;
51	struct drm_device	*sc_drm_dev;
52};
53
54static int	viadrm_match(device_t, cfdata_t, void *);
55static void	viadrm_attach(device_t, device_t, void *);
56static int	viadrm_detach(device_t, int);
57
58extern struct drm_driver *const via_drm_driver; /* XXX */
59
60CFATTACH_DECL_NEW(viadrmums, sizeof(struct viadrm_softc),
61    viadrm_match, viadrm_attach, viadrm_detach, NULL);
62
63static const struct pci_device_id viadrm_pci_ids[] = {
64	viadrv_PCI_IDS
65};
66
67static const unsigned long *
68viadrm_lookup(const struct pci_attach_args *pa)
69{
70	unsigned i;
71
72	for (i = 0; i < __arraycount(viadrm_pci_ids); i++) {
73		KASSERT(viadrm_pci_ids[i].subvendor == PCI_ANY_ID);
74		KASSERT(viadrm_pci_ids[i].subdevice == PCI_ANY_ID);
75		KASSERT(viadrm_pci_ids[i].class == 0);
76		KASSERT(viadrm_pci_ids[i].class_mask == 0);
77		if (PCI_VENDOR(pa->pa_id) != viadrm_pci_ids[i].vendor)
78			continue;
79		if (PCI_PRODUCT(pa->pa_id) != viadrm_pci_ids[i].device)
80			continue;
81		return &viadrm_pci_ids[i].driver_data;
82	}
83
84	return NULL;
85}
86
87static int
88viadrm_match(device_t parent, cfdata_t match, void *aux)
89{
90	extern int viadrm_guarantee_initialized(void);
91	const struct pci_attach_args *const pa = aux;
92	int error;
93
94	error = viadrm_guarantee_initialized();
95	if (error) {
96		aprint_error("viadrm: failed to initialize: %d\n", error);
97		return 0;
98	}
99
100	if (viadrm_lookup(pa) == NULL)
101		return 0;
102
103	return 1;
104}
105
106static void
107viadrm_attach(device_t parent, device_t self, void *aux)
108{
109	struct viadrm_softc *const sc = device_private(self);
110	const struct pci_attach_args *const pa = aux;
111	const unsigned long *const cookiep = viadrm_lookup(pa);
112	int error;
113
114	KASSERT(cookiep != NULL);
115
116	if (!pmf_device_register(self, NULL, NULL))
117		aprint_error_dev(self, "couldn't establish power handler\n");
118
119	/* Initialize the Linux PCI device descriptor.  */
120	linux_pci_dev_init(&sc->sc_pci_dev, self, device_parent(self), pa, 0);
121
122	/* XXX errno Linux->NetBSD */
123	error = -drm_pci_attach(self, pa, &sc->sc_pci_dev, via_drm_driver,
124	    *cookiep, &sc->sc_drm_dev);
125	if (error) {
126		aprint_error_dev(self, "unable to attach drm: %d\n", error);
127		return;
128	}
129}
130
131static int
132viadrm_detach(device_t self, int flags)
133{
134	struct viadrm_softc *const sc = device_private(self);
135	int error;
136
137	error = config_detach_children(self, flags);
138	if (error)
139		return error;
140	if (sc->sc_drm_dev == NULL)
141		goto out;
142	/* XXX errno Linux->NetBSD */
143	error = -drm_pci_detach(sc->sc_drm_dev, flags);
144	if (error)
145		return error;
146	sc->sc_drm_dev = NULL;
147
148out:	linux_pci_dev_destroy(&sc->sc_pci_dev);
149	pmf_device_deregister(self);
150	return 0;
151}
152