1 /* $NetBSD: genfb_pci.c,v 1.38 2016/07/07 06:55:41 msaitoh Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Michael Lorenz
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: genfb_pci.c,v 1.38 2016/07/07 06:55:41 msaitoh Exp $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/device.h>
36 #include <sys/proc.h>
37 #include <sys/mutex.h>
38 #include <sys/ioctl.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/kauth.h>
42
43 #include <dev/pci/pcidevs.h>
44 #include <dev/pci/pcireg.h>
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pciio.h>
47
48 #include <dev/wsfb/genfbvar.h>
49 #include <dev/pci/wsdisplay_pci.h>
50
51 #include <dev/pci/genfb_pcivar.h>
52
53 #include "opt_wsfb.h"
54 #include "opt_genfb.h"
55
56 #ifdef GENFB_PCI_DEBUG
57 # define DPRINTF printf
58 #else
59 # define DPRINTF while (0) printf
60 #endif
61
62 static int pci_genfb_match(device_t, cfdata_t, void *);
63 static void pci_genfb_attach(device_t, device_t, void *);
64 static int pci_genfb_ioctl(void *, void *, u_long, void *, int,
65 struct lwp *);
66 static paddr_t pci_genfb_mmap(void *, void *, off_t, int);
67 static int pci_genfb_borrow(void *, bus_addr_t, bus_space_handle_t *);
68 static int pci_genfb_drm_print(void *, const char *);
69 static bool pci_genfb_shutdown(device_t, int);
70
71 CFATTACH_DECL_NEW(genfb_pci, sizeof(struct pci_genfb_softc),
72 pci_genfb_match, pci_genfb_attach, NULL, NULL);
73
74 static int
pci_genfb_match(device_t parent,cfdata_t match,void * aux)75 pci_genfb_match(device_t parent, cfdata_t match, void *aux)
76 {
77 struct pci_attach_args *pa = aux;
78 int matchlvl = 1;
79
80 if (!genfb_is_enabled())
81 return 0; /* explicitly disabled by MD code */
82
83 if (genfb_is_console())
84 matchlvl = 5; /* beat VGA */
85
86 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_APPLE &&
87 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_APPLE_CONTROL)
88 return matchlvl;
89
90 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY)
91 return matchlvl;
92
93 return 0;
94 }
95
96 static void
pci_genfb_attach(device_t parent,device_t self,void * aux)97 pci_genfb_attach(device_t parent, device_t self, void *aux)
98 {
99 struct pci_genfb_softc *sc = device_private(self);
100 struct pci_attach_args *pa = aux;
101 static const struct genfb_ops zero_ops;
102 struct genfb_ops ops = zero_ops;
103 pcireg_t rom;
104 int idx, bar, type;
105
106 pci_aprint_devinfo(pa, NULL);
107
108 sc->sc_gen.sc_dev = self;
109 sc->sc_memt = pa->pa_memt;
110 sc->sc_iot = pa->pa_iot;
111 sc->sc_pc = pa->pa_pc;
112 sc->sc_pcitag = pa->pa_tag;
113 sc->sc_want_wsfb = 0;
114
115 genfb_init(&sc->sc_gen);
116
117 /* firmware / MD code responsible for restoring the display */
118 if (sc->sc_gen.sc_pmfcb == NULL)
119 pmf_device_register1(self, NULL, NULL,
120 pci_genfb_shutdown);
121 else
122 pmf_device_register1(self,
123 sc->sc_gen.sc_pmfcb->gpc_suspend,
124 sc->sc_gen.sc_pmfcb->gpc_resume,
125 pci_genfb_shutdown);
126
127 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) {
128 aprint_debug_dev(self, "not configured by firmware\n");
129 return;
130 }
131
132 /*
133 * if some MD code handed us a framebuffer VA we use that instead of
134 * mapping our own
135 */
136 if (sc->sc_gen.sc_fbaddr == NULL) {
137 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset,
138 sc->sc_gen.sc_fbsize,
139 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE,
140 &sc->sc_memh) != 0) {
141 aprint_error_dev(self,
142 "unable to map the framebuffer\n");
143 return;
144 }
145 sc->sc_gen.sc_fbaddr = bus_space_vaddr(sc->sc_memt,
146 sc->sc_memh);
147 } else
148 aprint_debug("%s: recycling existing fb mapping at %lx\n",
149 device_xname(sc->sc_gen.sc_dev),
150 (unsigned long)sc->sc_gen.sc_fbaddr);
151
152 /* mmap()able bus ranges */
153 idx = 0;
154 bar = PCI_MAPREG_START;
155 while (bar <= PCI_MAPREG_ROM) {
156
157 sc->sc_bars[(bar - PCI_MAPREG_START) >> 2] = rom =
158 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar);
159
160 if ((bar >= PCI_MAPREG_END && bar < PCI_MAPREG_ROM) ||
161 pci_mapreg_probe(sc->sc_pc, sc->sc_pcitag, bar, &type)
162 == 0) {
163 /* skip unimplemented and non-BAR registers */
164 bar += 4;
165 continue;
166 }
167 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM ||
168 PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_ROM) {
169 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type,
170 &sc->sc_ranges[idx].offset,
171 &sc->sc_ranges[idx].size,
172 &sc->sc_ranges[idx].flags);
173 idx++;
174 }
175 if ((bar == PCI_MAPREG_ROM) && (rom != 0)) {
176 pci_conf_write(sc->sc_pc, sc->sc_pcitag, bar, rom |
177 PCI_MAPREG_ROM_ENABLE);
178 }
179 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM &&
180 PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT)
181 bar += 8;
182 else
183 bar += 4;
184 }
185
186 sc->sc_ranges_used = idx;
187
188 ops.genfb_ioctl = pci_genfb_ioctl;
189 ops.genfb_mmap = pci_genfb_mmap;
190 ops.genfb_borrow = pci_genfb_borrow;
191
192 if (genfb_attach(&sc->sc_gen, &ops) == 0) {
193
194 /* now try to attach a DRM */
195 config_found_ia(self, "drm", aux, pci_genfb_drm_print);
196 }
197 }
198
199 static int
pci_genfb_drm_print(void * aux,const char * pnp)200 pci_genfb_drm_print(void *aux, const char *pnp)
201 {
202 if (pnp)
203 aprint_normal("drm at %s", pnp);
204 return (UNCONF);
205 }
206
207
208 static int
pci_genfb_ioctl(void * v,void * vs,u_long cmd,void * data,int flag,struct lwp * l)209 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
210 struct lwp *l)
211 {
212 struct pci_genfb_softc *sc = v;
213
214 switch (cmd) {
215 case WSDISPLAYIO_GTYPE:
216 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC;
217 return 0;
218
219 /* PCI config read/write passthrough. */
220 case PCI_IOC_CFGREAD:
221 case PCI_IOC_CFGWRITE:
222 return pci_devioctl(sc->sc_pc, sc->sc_pcitag,
223 cmd, data, flag, l);
224
225 case WSDISPLAYIO_GET_BUSID:
226 return wsdisplayio_busid_pci(sc->sc_gen.sc_dev, sc->sc_pc,
227 sc->sc_pcitag, data);
228
229 case WSDISPLAYIO_SMODE: {
230 int new_mode = *(int*)data, i;
231 if (new_mode == WSDISPLAYIO_MODE_EMUL) {
232 for (i = 0; i < 9; i++)
233 pci_conf_write(sc->sc_pc,
234 sc->sc_pcitag,
235 0x10 + (i << 2),
236 sc->sc_bars[i]);
237 }
238 }
239 return 0;
240 }
241
242 return EPASSTHROUGH;
243 }
244
245 static paddr_t
pci_genfb_mmap(void * v,void * vs,off_t offset,int prot)246 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot)
247 {
248 struct pci_genfb_softc *sc = v;
249 struct range *r;
250 int i;
251
252 if (offset == 0)
253 sc->sc_want_wsfb = 1;
254
255 /*
256 * regular fb mapping at 0
257 * since some Sun firmware likes to put PCI resources low enough
258 * to collide with the wsfb mapping we only allow it after asking
259 * for offset 0
260 */
261 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset,
262 (uint32_t)sc->sc_gen.sc_fbsize);
263 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) &&
264 (sc->sc_want_wsfb == 1)) {
265
266 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset,
267 offset, prot,
268 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
269 }
270
271 /*
272 * restrict all other mappings to processes with superuser privileges
273 * or the kernel itself
274 */
275 if (kauth_authorize_machdep(kauth_cred_get(), KAUTH_MACHDEP_UNMANAGEDMEM,
276 NULL, NULL, NULL, NULL) != 0) {
277 aprint_normal_dev(sc->sc_gen.sc_dev, "mmap() rejected.\n");
278 return -1;
279 }
280
281 #ifdef WSFB_FAKE_VGA_FB
282 if ((offset >= 0xa0000) && (offset < 0xbffff)) {
283
284 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset,
285 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR);
286 }
287 #endif
288
289 /*
290 * XXX this should be generalized, let's just
291 * #define PCI_IOAREA_PADDR
292 * #define PCI_IOAREA_OFFSET
293 * #define PCI_IOAREA_SIZE
294 * somewhere in a MD header and compile this code only if all are
295 * present
296 */
297 /*
298 * no.
299 * PCI_IOAREA_PADDR would be completely, utterly wrong and completely
300 * useless for the following reasons:
301 * - it's a bus address, not a physical address
302 * - there's no guarantee it's the same for each host bridge
303 * - it's already taken care of by the IO tag
304 * PCI_IOAREA_OFFSET is the same as PCI_MAGIC_IO_RANGE
305 * PCI_IOAREA_SIZE is also useless:
306 * - many cards don't decode more than 16 bit IO anyway
307 * - even machines with more than 64kB IO space try to keep everything
308 * within 64kB for the reason above
309 * - IO ranges tend to be small so in most cases you can't cram enough
310 * cards into a single machine to exhaust 64kB IO space
311 * - machines which need this tend to prefer memory space anyway
312 * - the only use for this right now is to allow the Xserver to map
313 * VGA registers on macppc and a few other powerpc ports, shark uses
314 * a similar mechanism, and what they need is always within 64kB
315 */
316 #ifdef PCI_MAGIC_IO_RANGE
317 /* allow to map our IO space */
318 if ((offset >= PCI_MAGIC_IO_RANGE) &&
319 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) {
320 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE,
321 0, prot, BUS_SPACE_MAP_LINEAR);
322 }
323 #endif
324
325 /* allow to mmap() our BARs */
326 /* maybe the ROM BAR too? */
327 for (i = 0; i < sc->sc_ranges_used; i++) {
328
329 r = &sc->sc_ranges[i];
330 if ((offset >= r->offset) && (offset < (r->offset + r->size))) {
331 return bus_space_mmap(sc->sc_memt, offset, 0, prot,
332 r->flags);
333 }
334 }
335
336 return -1;
337 }
338
339 int
pci_genfb_borrow(void * opaque,bus_addr_t addr,bus_space_handle_t * hdlp)340 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp)
341 {
342 struct pci_genfb_softc *sc = opaque;
343
344 if (sc == NULL)
345 return 0;
346 if (!sc->sc_gen.sc_fboffset)
347 return 0;
348 if (sc->sc_gen.sc_fboffset != addr)
349 return 0;
350 *hdlp = sc->sc_memh;
351 return 1;
352 }
353
354 static bool
pci_genfb_shutdown(device_t self,int flags)355 pci_genfb_shutdown(device_t self, int flags)
356 {
357 genfb_enable_polling(self);
358 return true;
359 }
360