1 /* $NetBSD: genfb_pci.c,v 1.32 2011/03/08 03:22:29 macallan 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 1.32 2011/03/08 03:22:29 macallan 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 /* 135 * if some MD code handed us a framebuffer VA we use that instead of 136 * mapping our own 137 */ 138 if (sc->sc_gen.sc_fbaddr == NULL) { 139 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset, 140 sc->sc_gen.sc_fbsize, 141 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE, 142 &sc->sc_memh) != 0) { 143 aprint_error_dev(self, "unable to map the framebuffer\n"); 144 return; 145 } 146 sc->sc_gen.sc_fbaddr = bus_space_vaddr(sc->sc_memt, sc->sc_memh); 147 } else 148 aprint_debug("%s: recycling existing fb mapping at %lx\n", 149 device_xname(sc->sc_gen.sc_dev), (unsigned long)sc->sc_gen.sc_fbaddr); 150 151 /* mmap()able bus ranges */ 152 idx = 0; 153 bar = PCI_MAPREG_START; 154 while (bar <= PCI_MAPREG_ROM) { 155 156 sc->sc_bars[(bar - PCI_MAPREG_START) >> 2] = rom = 157 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar); 158 159 if ((bar >= PCI_MAPREG_END && bar < PCI_MAPREG_ROM) || 160 pci_mapreg_probe(sc->sc_pc, sc->sc_pcitag, bar, &type) 161 == 0) { 162 /* skip unimplemented and non-BAR registers */ 163 bar += 4; 164 continue; 165 } 166 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM || 167 PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_ROM) { 168 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type, 169 &sc->sc_ranges[idx].offset, 170 &sc->sc_ranges[idx].size, 171 &sc->sc_ranges[idx].flags); 172 idx++; 173 } 174 if ((bar == PCI_MAPREG_ROM) && (rom != 0)) { 175 pci_conf_write(sc->sc_pc, sc->sc_pcitag, bar, rom | 176 PCI_MAPREG_ROM_ENABLE); 177 } 178 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM && 179 PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT) 180 bar += 8; 181 else 182 bar += 4; 183 } 184 185 sc->sc_ranges_used = idx; 186 187 ops.genfb_ioctl = pci_genfb_ioctl; 188 ops.genfb_mmap = pci_genfb_mmap; 189 ops.genfb_borrow = pci_genfb_borrow; 190 191 if (genfb_attach(&sc->sc_gen, &ops) == 0) { 192 193 /* now try to attach a DRM */ 194 config_found_ia(self, "drm", aux, pci_genfb_drm_print); 195 } 196 } 197 198 static int 199 pci_genfb_drm_print(void *aux, const char *pnp) 200 { 201 if (pnp) 202 aprint_normal("drm at %s", pnp); 203 return (UNCONF); 204 } 205 206 207 static int 208 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, 209 struct lwp *l) 210 { 211 struct pci_genfb_softc *sc = v; 212 213 switch (cmd) { 214 case WSDISPLAYIO_GTYPE: 215 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC; 216 return 0; 217 218 /* PCI config read/write passthrough. */ 219 case PCI_IOC_CFGREAD: 220 case PCI_IOC_CFGWRITE: 221 return pci_devioctl(sc->sc_pc, sc->sc_pcitag, 222 cmd, data, flag, l); 223 224 case WSDISPLAYIO_GET_BUSID: 225 return wsdisplayio_busid_pci(sc->sc_gen.sc_dev, sc->sc_pc, 226 sc->sc_pcitag, data); 227 228 case WSDISPLAYIO_SMODE: { 229 int new_mode = *(int*)data, i; 230 if (new_mode == WSDISPLAYIO_MODE_EMUL) { 231 for (i = 0; i < 9; i++) 232 pci_conf_write(sc->sc_pc, 233 sc->sc_pcitag, 234 0x10 + (i << 2), 235 sc->sc_bars[i]); 236 } 237 } 238 return 0; 239 } 240 241 return EPASSTHROUGH; 242 } 243 244 static paddr_t 245 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot) 246 { 247 struct pci_genfb_softc *sc = v; 248 struct range *r; 249 int i; 250 251 if (offset == 0) 252 sc->sc_want_wsfb = 1; 253 254 /* 255 * regular fb mapping at 0 256 * since some Sun firmware likes to put PCI resources low enough 257 * to collide with the wsfb mapping we only allow it after asking 258 * for offset 0 259 */ 260 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset, 261 (uint32_t)sc->sc_gen.sc_fbsize); 262 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) && 263 (sc->sc_want_wsfb == 1)) { 264 265 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 266 offset, prot, 267 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE); 268 } 269 270 /* 271 * restrict all other mappings to processes with superuser privileges 272 * or the kernel itself 273 */ 274 if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER, 275 NULL) != 0) { 276 aprint_normal_dev(sc->sc_gen.sc_dev, "mmap() rejected.\n"); 277 return -1; 278 } 279 280 #ifdef WSFB_FAKE_VGA_FB 281 if ((offset >= 0xa0000) && (offset < 0xbffff)) { 282 283 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 284 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR); 285 } 286 #endif 287 288 /* 289 * XXX this should be generalized, let's just 290 * #define PCI_IOAREA_PADDR 291 * #define PCI_IOAREA_OFFSET 292 * #define PCI_IOAREA_SIZE 293 * somewhere in a MD header and compile this code only if all are 294 * present 295 */ 296 /* 297 * no. 298 * PCI_IOAREA_PADDR would be completely, utterly wrong and completely 299 * useless for the following reasons: 300 * - it's a bus address, not a physical address 301 * - there's no guarantee it's the same for each host bridge 302 * - it's already taken care of by the IO tag 303 * PCI_IOAREA_OFFSET is the same as PCI_MAGIC_IO_RANGE 304 * PCI_IOAREA_SIZE is also useless: 305 * - many cards don't decode more than 16 bit IO anyway 306 * - even machines with more than 64kB IO space try to keep everything 307 * within 64kB for the reason above 308 * - IO ranges tend to be small so in most cases you can't cram enough 309 * cards into a single machine to exhaust 64kB IO space 310 * - machines which need this tend to prefer memory space anyway 311 * - the only use for this right now is to allow the Xserver to map 312 * VGA registers on macppc and a few other powerpc ports, shark uses 313 * a similar mechanism, and what they need is always within 64kB 314 */ 315 #ifdef PCI_MAGIC_IO_RANGE 316 /* allow to map our IO space */ 317 if ((offset >= PCI_MAGIC_IO_RANGE) && 318 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) { 319 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 320 0, prot, BUS_SPACE_MAP_LINEAR); 321 } 322 #endif 323 324 /* allow to mmap() our BARs */ 325 /* maybe the ROM BAR too? */ 326 for (i = 0; i < sc->sc_ranges_used; i++) { 327 328 r = &sc->sc_ranges[i]; 329 if ((offset >= r->offset) && (offset < (r->offset + r->size))) { 330 return bus_space_mmap(sc->sc_memt, offset, 0, prot, 331 r->flags); 332 } 333 } 334 335 return -1; 336 } 337 338 int 339 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp) 340 { 341 struct pci_genfb_softc *sc = opaque; 342 343 if (sc == NULL) 344 return 0; 345 if (!sc->sc_gen.sc_fboffset) 346 return 0; 347 if (sc->sc_gen.sc_fboffset != addr) 348 return 0; 349 *hdlp = sc->sc_memh; 350 return 1; 351 } 352 353 static bool 354 pci_genfb_shutdown(device_t self, int flags) 355 { 356 genfb_enable_polling(self); 357 return true; 358 } 359