genfb_pci.c revision 1.33
1 /* $NetBSD: genfb_pci.c,v 1.33 2012/01/30 19:41:19 drochner 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 1.33 2012/01/30 19:41:19 drochner 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 struct genfb_ops ops; 102 pcireg_t rom; 103 int idx, bar, type; 104 105 pci_aprint_devinfo(pa, NULL); 106 107 sc->sc_gen.sc_dev = self; 108 sc->sc_memt = pa->pa_memt; 109 sc->sc_iot = pa->pa_iot; 110 sc->sc_pc = pa->pa_pc; 111 sc->sc_pcitag = pa->pa_tag; 112 sc->sc_want_wsfb = 0; 113 114 genfb_init(&sc->sc_gen); 115 116 /* firmware / MD code responsible for restoring the display */ 117 if (sc->sc_gen.sc_pmfcb == NULL) 118 pmf_device_register1(self, NULL, NULL, 119 pci_genfb_shutdown); 120 else 121 pmf_device_register1(self, 122 sc->sc_gen.sc_pmfcb->gpc_suspend, 123 sc->sc_gen.sc_pmfcb->gpc_resume, 124 pci_genfb_shutdown); 125 126 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) { 127 aprint_debug_dev(self, "not configured by firmware\n"); 128 return; 129 } 130 131 /* 132 * if some MD code handed us a framebuffer VA we use that instead of 133 * mapping our own 134 */ 135 if (sc->sc_gen.sc_fbaddr == NULL) { 136 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset, 137 sc->sc_gen.sc_fbsize, 138 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE, 139 &sc->sc_memh) != 0) { 140 aprint_error_dev(self, "unable to map the framebuffer\n"); 141 return; 142 } 143 sc->sc_gen.sc_fbaddr = bus_space_vaddr(sc->sc_memt, sc->sc_memh); 144 } else 145 aprint_debug("%s: recycling existing fb mapping at %lx\n", 146 device_xname(sc->sc_gen.sc_dev), (unsigned long)sc->sc_gen.sc_fbaddr); 147 148 /* mmap()able bus ranges */ 149 idx = 0; 150 bar = PCI_MAPREG_START; 151 while (bar <= PCI_MAPREG_ROM) { 152 153 sc->sc_bars[(bar - PCI_MAPREG_START) >> 2] = rom = 154 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar); 155 156 if ((bar >= PCI_MAPREG_END && bar < PCI_MAPREG_ROM) || 157 pci_mapreg_probe(sc->sc_pc, sc->sc_pcitag, bar, &type) 158 == 0) { 159 /* skip unimplemented and non-BAR registers */ 160 bar += 4; 161 continue; 162 } 163 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM || 164 PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_ROM) { 165 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type, 166 &sc->sc_ranges[idx].offset, 167 &sc->sc_ranges[idx].size, 168 &sc->sc_ranges[idx].flags); 169 idx++; 170 } 171 if ((bar == PCI_MAPREG_ROM) && (rom != 0)) { 172 pci_conf_write(sc->sc_pc, sc->sc_pcitag, bar, rom | 173 PCI_MAPREG_ROM_ENABLE); 174 } 175 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM && 176 PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT) 177 bar += 8; 178 else 179 bar += 4; 180 } 181 182 sc->sc_ranges_used = idx; 183 184 ops.genfb_ioctl = pci_genfb_ioctl; 185 ops.genfb_mmap = pci_genfb_mmap; 186 ops.genfb_borrow = pci_genfb_borrow; 187 188 if (genfb_attach(&sc->sc_gen, &ops) == 0) { 189 190 /* now try to attach a DRM */ 191 config_found_ia(self, "drm", aux, pci_genfb_drm_print); 192 } 193 } 194 195 static int 196 pci_genfb_drm_print(void *aux, const char *pnp) 197 { 198 if (pnp) 199 aprint_normal("drm at %s", pnp); 200 return (UNCONF); 201 } 202 203 204 static int 205 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, 206 struct lwp *l) 207 { 208 struct pci_genfb_softc *sc = v; 209 210 switch (cmd) { 211 case WSDISPLAYIO_GTYPE: 212 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC; 213 return 0; 214 215 /* PCI config read/write passthrough. */ 216 case PCI_IOC_CFGREAD: 217 case PCI_IOC_CFGWRITE: 218 return pci_devioctl(sc->sc_pc, sc->sc_pcitag, 219 cmd, data, flag, l); 220 221 case WSDISPLAYIO_GET_BUSID: 222 return wsdisplayio_busid_pci(sc->sc_gen.sc_dev, sc->sc_pc, 223 sc->sc_pcitag, data); 224 225 case WSDISPLAYIO_SMODE: { 226 int new_mode = *(int*)data, i; 227 if (new_mode == WSDISPLAYIO_MODE_EMUL) { 228 for (i = 0; i < 9; i++) 229 pci_conf_write(sc->sc_pc, 230 sc->sc_pcitag, 231 0x10 + (i << 2), 232 sc->sc_bars[i]); 233 } 234 } 235 return 0; 236 } 237 238 return EPASSTHROUGH; 239 } 240 241 static paddr_t 242 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot) 243 { 244 struct pci_genfb_softc *sc = v; 245 struct range *r; 246 int i; 247 248 if (offset == 0) 249 sc->sc_want_wsfb = 1; 250 251 /* 252 * regular fb mapping at 0 253 * since some Sun firmware likes to put PCI resources low enough 254 * to collide with the wsfb mapping we only allow it after asking 255 * for offset 0 256 */ 257 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset, 258 (uint32_t)sc->sc_gen.sc_fbsize); 259 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) && 260 (sc->sc_want_wsfb == 1)) { 261 262 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 263 offset, prot, 264 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE); 265 } 266 267 /* 268 * restrict all other mappings to processes with superuser privileges 269 * or the kernel itself 270 */ 271 if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER, 272 NULL) != 0) { 273 aprint_normal_dev(sc->sc_gen.sc_dev, "mmap() rejected.\n"); 274 return -1; 275 } 276 277 #ifdef WSFB_FAKE_VGA_FB 278 if ((offset >= 0xa0000) && (offset < 0xbffff)) { 279 280 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 281 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR); 282 } 283 #endif 284 285 /* 286 * XXX this should be generalized, let's just 287 * #define PCI_IOAREA_PADDR 288 * #define PCI_IOAREA_OFFSET 289 * #define PCI_IOAREA_SIZE 290 * somewhere in a MD header and compile this code only if all are 291 * present 292 */ 293 /* 294 * no. 295 * PCI_IOAREA_PADDR would be completely, utterly wrong and completely 296 * useless for the following reasons: 297 * - it's a bus address, not a physical address 298 * - there's no guarantee it's the same for each host bridge 299 * - it's already taken care of by the IO tag 300 * PCI_IOAREA_OFFSET is the same as PCI_MAGIC_IO_RANGE 301 * PCI_IOAREA_SIZE is also useless: 302 * - many cards don't decode more than 16 bit IO anyway 303 * - even machines with more than 64kB IO space try to keep everything 304 * within 64kB for the reason above 305 * - IO ranges tend to be small so in most cases you can't cram enough 306 * cards into a single machine to exhaust 64kB IO space 307 * - machines which need this tend to prefer memory space anyway 308 * - the only use for this right now is to allow the Xserver to map 309 * VGA registers on macppc and a few other powerpc ports, shark uses 310 * a similar mechanism, and what they need is always within 64kB 311 */ 312 #ifdef PCI_MAGIC_IO_RANGE 313 /* allow to map our IO space */ 314 if ((offset >= PCI_MAGIC_IO_RANGE) && 315 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) { 316 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 317 0, prot, BUS_SPACE_MAP_LINEAR); 318 } 319 #endif 320 321 /* allow to mmap() our BARs */ 322 /* maybe the ROM BAR too? */ 323 for (i = 0; i < sc->sc_ranges_used; i++) { 324 325 r = &sc->sc_ranges[i]; 326 if ((offset >= r->offset) && (offset < (r->offset + r->size))) { 327 return bus_space_mmap(sc->sc_memt, offset, 0, prot, 328 r->flags); 329 } 330 } 331 332 return -1; 333 } 334 335 int 336 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp) 337 { 338 struct pci_genfb_softc *sc = opaque; 339 340 if (sc == NULL) 341 return 0; 342 if (!sc->sc_gen.sc_fboffset) 343 return 0; 344 if (sc->sc_gen.sc_fboffset != addr) 345 return 0; 346 *hdlp = sc->sc_memh; 347 return 1; 348 } 349 350 static bool 351 pci_genfb_shutdown(device_t self, int flags) 352 { 353 genfb_enable_polling(self); 354 return true; 355 } 356
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