genfb_pci.c revision 1.13
1 /* $NetBSD: genfb_pci.c,v 1.13 2009/02/15 18:41:49 jmcneill 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 1.13 2009/02/15 18:41:49 jmcneill 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 50 #include "opt_wsfb.h" 51 #include "opt_genfb.h" 52 53 #ifdef GENFB_PCI_DEBUG 54 # define DPRINTF printf 55 #else 56 # define DPRINTF while (0) printf 57 #endif 58 59 struct range { 60 bus_addr_t offset; 61 bus_size_t size; 62 int flags; 63 }; 64 65 struct pci_genfb_softc { 66 struct genfb_softc sc_gen; 67 68 pci_chipset_tag_t sc_pc; 69 pcitag_t sc_pcitag; 70 bus_space_tag_t sc_memt; 71 bus_space_tag_t sc_iot; 72 bus_space_handle_t sc_memh; 73 pcireg_t sc_bars[9]; 74 struct range sc_ranges[8]; 75 int sc_ranges_used; 76 int sc_want_wsfb; 77 }; 78 79 static int pci_genfb_match(struct device *, struct cfdata *, void *); 80 static void pci_genfb_attach(struct device *, struct device *, void *); 81 static int pci_genfb_ioctl(void *, void *, u_long, void *, int, 82 struct lwp *); 83 static paddr_t pci_genfb_mmap(void *, void *, off_t, int); 84 static int pci_genfb_borrow(void *, bus_addr_t, bus_space_handle_t *); 85 static int pci_genfb_drm_print(void *, const char *); 86 87 CFATTACH_DECL(genfb_pci, sizeof(struct pci_genfb_softc), 88 pci_genfb_match, pci_genfb_attach, NULL, NULL); 89 90 static int 91 pci_genfb_match(struct device *parent, struct cfdata *match, void *aux) 92 { 93 struct pci_attach_args *pa = aux; 94 int matchlvl = 1; 95 96 if (genfb_is_console()) 97 matchlvl = 5; /* beat VGA */ 98 99 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_APPLE && 100 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_APPLE_CONTROL) 101 return matchlvl; 102 103 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY) 104 return matchlvl; 105 106 return 0; 107 } 108 109 static void 110 pci_genfb_attach(struct device *parent, struct device *self, void *aux) 111 { 112 struct pci_genfb_softc *sc = (struct pci_genfb_softc *)self; 113 struct pci_attach_args *pa = aux; 114 struct genfb_ops ops; 115 int idx, bar, type; 116 char devinfo[256]; 117 118 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 119 printf(": %s\n", devinfo); 120 121 sc->sc_memt = pa->pa_memt; 122 sc->sc_iot = pa->pa_iot; 123 sc->sc_pc = pa->pa_pc; 124 sc->sc_pcitag = pa->pa_tag; 125 sc->sc_want_wsfb = 0; 126 127 genfb_init(&sc->sc_gen); 128 129 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) { 130 aprint_error("%s: bogus parameters, unable to continue\n", 131 device_xname(self)); 132 return; 133 } 134 135 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset, 136 sc->sc_gen.sc_fbsize, BUS_SPACE_MAP_LINEAR, &sc->sc_memh) != 0) { 137 138 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 = 0x10; 146 while (bar < 0x30) { 147 148 type = pci_mapreg_type(sc->sc_pc, sc->sc_pcitag, bar); 149 if ((type == PCI_MAPREG_TYPE_MEM) || 150 (type == PCI_MAPREG_TYPE_ROM)) { 151 152 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type, 153 &sc->sc_ranges[idx].offset, 154 &sc->sc_ranges[idx].size, 155 &sc->sc_ranges[idx].flags); 156 idx++; 157 } 158 sc->sc_bars[(bar - 0x10) >> 2] = 159 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar); 160 bar += 4; 161 } 162 sc->sc_ranges_used = idx; 163 164 ops.genfb_ioctl = pci_genfb_ioctl; 165 ops.genfb_mmap = pci_genfb_mmap; 166 ops.genfb_borrow = pci_genfb_borrow; 167 168 if (genfb_attach(&sc->sc_gen, &ops) == 0) { 169 170 /* now try to attach a DRM */ 171 config_found_ia(self, "drm", aux, pci_genfb_drm_print); 172 } 173 } 174 175 static int 176 pci_genfb_drm_print(void *aux, const char *pnp) 177 { 178 if (pnp) 179 aprint_normal("drm at %s", pnp); 180 return (UNCONF); 181 } 182 183 184 static int 185 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, 186 struct lwp *l) 187 { 188 struct pci_genfb_softc *sc = v; 189 190 switch (cmd) { 191 case WSDISPLAYIO_GTYPE: 192 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC; 193 return 0; 194 195 /* PCI config read/write passthrough. */ 196 case PCI_IOC_CFGREAD: 197 case PCI_IOC_CFGWRITE: 198 return (pci_devioctl(sc->sc_pc, sc->sc_pcitag, 199 cmd, data, flag, l)); 200 case WSDISPLAYIO_SMODE: 201 { 202 int new_mode = *(int*)data, i; 203 if (new_mode == WSDISPLAYIO_MODE_EMUL) { 204 for (i = 0; i < 9; i++) 205 pci_conf_write(sc->sc_pc, 206 sc->sc_pcitag, 207 0x10 + (i << 2), 208 sc->sc_bars[i]); 209 } 210 } 211 return 0; 212 } 213 214 return EPASSTHROUGH; 215 } 216 217 static paddr_t 218 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot) 219 { 220 struct pci_genfb_softc *sc = v; 221 struct range *r; 222 struct lwp *me; 223 int i; 224 225 if (offset == 0) 226 sc->sc_want_wsfb = 1; 227 228 /* 229 * regular fb mapping at 0 230 * since some Sun firmware likes to put PCI resources low enough 231 * to collide with the wsfb mapping we only allow it after asking 232 * for offset 0 233 */ 234 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset, 235 (uint32_t)sc->sc_gen.sc_fbsize); 236 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) && 237 (sc->sc_want_wsfb == 1)) { 238 239 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 240 offset, prot, BUS_SPACE_MAP_LINEAR); 241 } 242 243 /* 244 * restrict all other mappings to processes with superuser privileges 245 * or the kernel itself 246 */ 247 me = curlwp; 248 if (me != NULL) { 249 if (kauth_authorize_generic(me->l_cred, KAUTH_GENERIC_ISSUSER, 250 NULL) != 0) { 251 aprint_normal_dev(&sc->sc_gen.sc_dev, "mmap() rejected.\n"); 252 return -1; 253 } 254 } 255 256 #ifdef WSFB_FAKE_VGA_FB 257 if ((offset >= 0xa0000) && (offset < 0xbffff)) { 258 259 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 260 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR); 261 } 262 #endif 263 264 /* 265 * XXX this should be generalized, let's just 266 * #define PCI_IOAREA_PADDR 267 * #define PCI_IOAREA_OFFSET 268 * #define PCI_IOAREA_SIZE 269 * somewhere in a MD header and compile this code only if all are 270 * present 271 */ 272 #ifdef PCI_MAGIC_IO_RANGE 273 /* allow to map our IO space */ 274 if ((offset >= PCI_MAGIC_IO_RANGE) && 275 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) { 276 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 277 0, prot, BUS_SPACE_MAP_LINEAR); 278 } 279 #endif 280 281 /* allow to mmap() our BARs */ 282 /* maybe the ROM BAR too? */ 283 for (i = 0; i < sc->sc_ranges_used; i++) { 284 285 r = &sc->sc_ranges[i]; 286 if ((offset >= r->offset) && (offset < (r->offset + r->size))) { 287 return bus_space_mmap(sc->sc_memt, offset, 0, prot, 288 r->flags); 289 } 290 } 291 292 return -1; 293 } 294 295 int 296 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp) 297 { 298 struct pci_genfb_softc *sc = opaque; 299 300 if (sc == NULL) 301 return 0; 302 if (!sc->sc_gen.sc_fboffset) 303 return 0; 304 if (sc->sc_gen.sc_fboffset != addr) 305 return 0; 306 *hdlp = sc->sc_memh; 307 return 1; 308 } 309
Indexes created Fri Sep 26 08:10:20 GMT 2025