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 |
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 |
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 |
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 |
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 |
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 |
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 |
355 | pci_genfb_shutdown(device_t self, int flags) |
356 | { |
357 | genfb_enable_polling(self); |
358 | return true; |
359 | } |
360 | |