1/*	$NetBSD: drmfb_pci.c,v 1.5 2021/12/19 10:37:32 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2014 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/*
33 * drmfb_pci: drmfb hooks for PCI devices.
34 */
35
36#include <sys/cdefs.h>
37__KERNEL_RCSID(0, "$NetBSD: drmfb_pci.c,v 1.5 2021/12/19 10:37:32 riastradh Exp $");
38
39#ifdef _KERNEL_OPT
40#include "vga.h"
41#endif
42
43#include <sys/types.h>
44#include <sys/device.h>
45#include <sys/errno.h>
46#include <sys/systm.h>
47
48#include <dev/pci/pciio.h>
49#include <dev/pci/pcireg.h>
50#include <dev/pci/pcivar.h>
51#include <dev/pci/wsdisplay_pci.h>
52
53#if NVGA > 0
54/*
55 * XXX All we really need is vga_is_console from vgavar.h, but the
56 * header files are missing their own dependencies, so we need to
57 * explicitly drag in the other crap.
58 */
59#include <dev/ic/mc6845reg.h>
60#include <dev/ic/pcdisplayvar.h>
61#include <dev/ic/vgareg.h>
62#include <dev/ic/vgavar.h>
63#endif
64
65#include <linux/pci.h>
66
67#include <drm/drm_device.h>
68#include <drm/drm_fb_helper.h>
69
70#include <drm/drmfb.h>
71#include <drm/drmfb_pci.h>
72
73/*
74 * drmfb_pci_mmap: Implementation of drmfb_params::dp_mmap.  Don't use
75 * this for dp_mmapfb -- how to get at the framebuffer is device-
76 * specific.
77 */
78paddr_t
79drmfb_pci_mmap(struct drmfb_softc *sc, off_t offset, int prot)
80{
81	struct drm_device *const dev = sc->sc_da.da_fb_helper->dev;
82	const struct pci_attach_args *const pa = &dev->pdev->pd_pa;
83	unsigned i;
84
85	for (i = 0; PCI_BAR(i) <= PCI_MAPREG_ROM; i++) {
86		pcireg_t type;
87		bus_addr_t addr;
88		bus_size_t size;
89		int flags;
90
91		/* Interrogate the BAR.  */
92		if (!pci_mapreg_probe(pa->pa_pc, pa->pa_tag, PCI_BAR(i),
93			&type))
94			continue;
95		if (PCI_MAPREG_TYPE(type) != PCI_MAPREG_TYPE_MEM)
96			continue;
97		if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, PCI_BAR(i), type,
98			&addr, &size, &flags))
99			continue;
100
101		/* Try to map it if it's in range.  */
102		if ((addr <= offset) && (offset < (addr + size)))
103			return bus_space_mmap(pa->pa_memt, addr,
104			    (offset - addr), prot, flags);
105
106		/* Skip a slot if this was a 64-bit BAR.  */
107		if ((PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM) &&
108		    (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT))
109			i += 1;
110	}
111
112	/* Failure!  */
113	return -1;
114}
115
116/*
117 * drmfb_pci_ioctl: Implementation of drmfb_params::dp_ioctl.  Provides:
118 *
119 * - WSDISPLAY_GET_BUSID
120 * - WSDISPLAY_GTYPE
121 *
122 * Additionally allows access to PCI registers.
123 *
124 * XXX Do we need to provide access to PCI registers?  I can't find
125 * anything that uses this functionality, and as is it is very
126 * dangerous.
127 */
128int
129drmfb_pci_ioctl(struct drmfb_softc *sc, unsigned long cmd, void *data,
130    int flag, struct lwp *l)
131{
132	struct drm_device *const dev = sc->sc_da.da_fb_helper->dev;
133	struct pci_attach_args *const pa = &dev->pdev->pd_pa;
134
135	switch (cmd) {
136	/* PCI config read/write passthrough.  */
137	case PCI_IOC_CFGREAD:
138	case PCI_IOC_CFGWRITE:
139		return pci_devioctl(pa->pa_pc, pa->pa_tag, cmd, data, flag, l);
140
141	/* PCI-specific wsdisplay ioctls.  */
142	case WSDISPLAYIO_GET_BUSID:
143		return wsdisplayio_busid_pci(dev->dev, pa->pa_pc, pa->pa_tag,
144		    data);
145	case WSDISPLAYIO_GTYPE:
146		*(unsigned int *)data = WSDISPLAY_TYPE_PCIVGA;
147		return 0;
148
149	default:
150		return EPASSTHROUGH;
151	}
152}
153
154bool
155drmfb_pci_is_vga_console(struct drm_device *dev)
156{
157
158#if NVGA > 0
159	return vga_is_console(dev->pdev->pd_pa.pa_iot, -1);
160#else
161	return false;
162#endif
163}
164