genfb_pci.c revision 1.31
1 /* $NetBSD: genfb_pci.c,v 1.31 2011/02/13 11:00:58 phx 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 1.31 2011/02/13 11:00:58 phx 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 char devinfo[256]; 105 106 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 107 aprint_naive("\n"); 108 aprint_normal(": %s\n", devinfo); 109 110 sc->sc_gen.sc_dev = self; 111 sc->sc_memt = pa->pa_memt; 112 sc->sc_iot = pa->pa_iot; 113 sc->sc_pc = pa->pa_pc; 114 sc->sc_pcitag = pa->pa_tag; 115 sc->sc_want_wsfb = 0; 116 117 genfb_init(&sc->sc_gen); 118 119 /* firmware / MD code responsible for restoring the display */ 120 if (sc->sc_gen.sc_pmfcb == NULL) 121 pmf_device_register1(self, NULL, NULL, 122 pci_genfb_shutdown); 123 else 124 pmf_device_register1(self, 125 sc->sc_gen.sc_pmfcb->gpc_suspend, 126 sc->sc_gen.sc_pmfcb->gpc_resume, 127 pci_genfb_shutdown); 128 129 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) { 130 aprint_debug_dev(self, "not configured by firmware\n"); 131 return; 132 } 133 134 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset, 135 sc->sc_gen.sc_fbsize, 136 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE, 137 &sc->sc_memh) != 0) { 138 aprint_error_dev(self, "unable to map the framebuffer\n"); 139 return; 140 } 141 sc->sc_gen.sc_fbaddr = bus_space_vaddr(sc->sc_memt, sc->sc_memh); 142 143 /* mmap()able bus ranges */ 144 idx = 0; 145 bar = PCI_MAPREG_START; 146 while (bar <= PCI_MAPREG_ROM) { 147 148 sc->sc_bars[(bar - PCI_MAPREG_START) >> 2] = rom = 149 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar); 150 151 if ((bar >= PCI_MAPREG_END && bar < PCI_MAPREG_ROM) || 152 pci_mapreg_probe(sc->sc_pc, sc->sc_pcitag, bar, &type) 153 == 0) { 154 /* skip unimplemented and non-BAR registers */ 155 bar += 4; 156 continue; 157 } 158 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM || 159 PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_ROM) { 160 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type, 161 &sc->sc_ranges[idx].offset, 162 &sc->sc_ranges[idx].size, 163 &sc->sc_ranges[idx].flags); 164 idx++; 165 } 166 if ((bar == PCI_MAPREG_ROM) && (rom != 0)) { 167 pci_conf_write(sc->sc_pc, sc->sc_pcitag, bar, rom | 168 PCI_MAPREG_ROM_ENABLE); 169 } 170 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM && 171 PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT) 172 bar += 8; 173 else 174 bar += 4; 175 } 176 177 sc->sc_ranges_used = idx; 178 179 ops.genfb_ioctl = pci_genfb_ioctl; 180 ops.genfb_mmap = pci_genfb_mmap; 181 ops.genfb_borrow = pci_genfb_borrow; 182 183 if (genfb_attach(&sc->sc_gen, &ops) == 0) { 184 185 /* now try to attach a DRM */ 186 config_found_ia(self, "drm", aux, pci_genfb_drm_print); 187 } 188 } 189 190 static int 191 pci_genfb_drm_print(void *aux, const char *pnp) 192 { 193 if (pnp) 194 aprint_normal("drm at %s", pnp); 195 return (UNCONF); 196 } 197 198 199 static int 200 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, 201 struct lwp *l) 202 { 203 struct pci_genfb_softc *sc = v; 204 205 switch (cmd) { 206 case WSDISPLAYIO_GTYPE: 207 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC; 208 return 0; 209 210 /* PCI config read/write passthrough. */ 211 case PCI_IOC_CFGREAD: 212 case PCI_IOC_CFGWRITE: 213 return pci_devioctl(sc->sc_pc, sc->sc_pcitag, 214 cmd, data, flag, l); 215 216 case WSDISPLAYIO_GET_BUSID: 217 return wsdisplayio_busid_pci(sc->sc_gen.sc_dev, sc->sc_pc, 218 sc->sc_pcitag, data); 219 220 case WSDISPLAYIO_SMODE: { 221 int new_mode = *(int*)data, i; 222 if (new_mode == WSDISPLAYIO_MODE_EMUL) { 223 for (i = 0; i < 9; i++) 224 pci_conf_write(sc->sc_pc, 225 sc->sc_pcitag, 226 0x10 + (i << 2), 227 sc->sc_bars[i]); 228 } 229 } 230 return 0; 231 } 232 233 return EPASSTHROUGH; 234 } 235 236 static paddr_t 237 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot) 238 { 239 struct pci_genfb_softc *sc = v; 240 struct range *r; 241 int i; 242 243 if (offset == 0) 244 sc->sc_want_wsfb = 1; 245 246 /* 247 * regular fb mapping at 0 248 * since some Sun firmware likes to put PCI resources low enough 249 * to collide with the wsfb mapping we only allow it after asking 250 * for offset 0 251 */ 252 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset, 253 (uint32_t)sc->sc_gen.sc_fbsize); 254 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) && 255 (sc->sc_want_wsfb == 1)) { 256 257 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 258 offset, prot, 259 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE); 260 } 261 262 /* 263 * restrict all other mappings to processes with superuser privileges 264 * or the kernel itself 265 */ 266 if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER, 267 NULL) != 0) { 268 aprint_normal_dev(sc->sc_gen.sc_dev, "mmap() rejected.\n"); 269 return -1; 270 } 271 272 #ifdef WSFB_FAKE_VGA_FB 273 if ((offset >= 0xa0000) && (offset < 0xbffff)) { 274 275 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 276 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR); 277 } 278 #endif 279 280 /* 281 * XXX this should be generalized, let's just 282 * #define PCI_IOAREA_PADDR 283 * #define PCI_IOAREA_OFFSET 284 * #define PCI_IOAREA_SIZE 285 * somewhere in a MD header and compile this code only if all are 286 * present 287 */ 288 /* 289 * no. 290 * PCI_IOAREA_PADDR would be completely, utterly wrong and completely 291 * useless for the following reasons: 292 * - it's a bus address, not a physical address 293 * - there's no guarantee it's the same for each host bridge 294 * - it's already taken care of by the IO tag 295 * PCI_IOAREA_OFFSET is the same as PCI_MAGIC_IO_RANGE 296 * PCI_IOAREA_SIZE is also useless: 297 * - many cards don't decode more than 16 bit IO anyway 298 * - even machines with more than 64kB IO space try to keep everything 299 * within 64kB for the reason above 300 * - IO ranges tend to be small so in most cases you can't cram enough 301 * cards into a single machine to exhaust 64kB IO space 302 * - machines which need this tend to prefer memory space anyway 303 * - the only use for this right now is to allow the Xserver to map 304 * VGA registers on macppc and a few other powerpc ports, shark uses 305 * a similar mechanism, and what they need is always within 64kB 306 */ 307 #ifdef PCI_MAGIC_IO_RANGE 308 /* allow to map our IO space */ 309 if ((offset >= PCI_MAGIC_IO_RANGE) && 310 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) { 311 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 312 0, prot, BUS_SPACE_MAP_LINEAR); 313 } 314 #endif 315 316 /* allow to mmap() our BARs */ 317 /* maybe the ROM BAR too? */ 318 for (i = 0; i < sc->sc_ranges_used; i++) { 319 320 r = &sc->sc_ranges[i]; 321 if ((offset >= r->offset) && (offset < (r->offset + r->size))) { 322 return bus_space_mmap(sc->sc_memt, offset, 0, prot, 323 r->flags); 324 } 325 } 326 327 return -1; 328 } 329 330 int 331 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp) 332 { 333 struct pci_genfb_softc *sc = opaque; 334 335 if (sc == NULL) 336 return 0; 337 if (!sc->sc_gen.sc_fboffset) 338 return 0; 339 if (sc->sc_gen.sc_fboffset != addr) 340 return 0; 341 *hdlp = sc->sc_memh; 342 return 1; 343 } 344 345 static bool 346 pci_genfb_shutdown(device_t self, int flags) 347 { 348 genfb_enable_polling(self); 349 return true; 350 } 351
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