1 /* $NetBSD: genfb_pci.c,v 1.23 2009/08/24 11:32:49 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 1.23 2009/08/24 11:32:49 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 <dev/pci/genfb_pcivar.h> 51 52 #include "opt_wsfb.h" 53 #include "opt_genfb.h" 54 55 #ifdef GENFB_PCI_DEBUG 56 # define DPRINTF printf 57 #else 58 # define DPRINTF while (0) printf 59 #endif 60 61 static int pci_genfb_match(device_t, cfdata_t, void *); 62 static void pci_genfb_attach(device_t, device_t, void *); 63 static int pci_genfb_ioctl(void *, void *, u_long, void *, int, 64 struct lwp *); 65 static paddr_t pci_genfb_mmap(void *, void *, off_t, int); 66 static int pci_genfb_borrow(void *, bus_addr_t, bus_space_handle_t *); 67 static int pci_genfb_drm_print(void *, const char *); 68 69 CFATTACH_DECL(genfb_pci, sizeof(struct pci_genfb_softc), 70 pci_genfb_match, pci_genfb_attach, NULL, NULL); 71 72 static int 73 pci_genfb_match(device_t parent, cfdata_t match, void *aux) 74 { 75 struct pci_attach_args *pa = aux; 76 int matchlvl = 1; 77 78 if (!genfb_is_enabled()) 79 return 0; /* explicitly disabled by MD code */ 80 81 if (genfb_is_console()) 82 matchlvl = 5; /* beat VGA */ 83 84 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_APPLE && 85 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_APPLE_CONTROL) 86 return matchlvl; 87 88 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY) 89 return matchlvl; 90 91 return 0; 92 } 93 94 static void 95 pci_genfb_attach(device_t parent, device_t self, void *aux) 96 { 97 struct pci_genfb_softc *sc = device_private(self); 98 struct pci_attach_args *pa = aux; 99 struct genfb_ops ops; 100 int idx, bar, type; 101 char devinfo[256]; 102 103 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 104 aprint_naive("\n"); 105 aprint_normal(": %s\n", devinfo); 106 107 sc->sc_memt = pa->pa_memt; 108 sc->sc_iot = pa->pa_iot; 109 sc->sc_pc = pa->pa_pc; 110 sc->sc_pcitag = pa->pa_tag; 111 sc->sc_want_wsfb = 0; 112 113 genfb_init(&sc->sc_gen); 114 115 /* firmware / MD code responsible for restoring the display */ 116 if (sc->sc_gen.sc_pmfcb == NULL) 117 pmf_device_register(self, NULL, NULL); 118 else 119 pmf_device_register(self, 120 sc->sc_gen.sc_pmfcb->gpc_suspend, 121 sc->sc_gen.sc_pmfcb->gpc_resume); 122 123 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) { 124 aprint_debug_dev(self, "not configured by firmware\n"); 125 return; 126 } 127 128 if (bus_space_map(sc->sc_memt, sc->sc_gen.sc_fboffset, 129 sc->sc_gen.sc_fbsize, BUS_SPACE_MAP_LINEAR, &sc->sc_memh) != 0) { 130 131 aprint_error_dev(self, "unable to map the framebuffer\n"); 132 return; 133 } 134 sc->sc_gen.sc_fbaddr = bus_space_vaddr(sc->sc_memt, sc->sc_memh); 135 136 /* mmap()able bus ranges */ 137 idx = 0; 138 bar = 0x10; 139 while (bar < 0x30) { 140 141 type = pci_mapreg_type(sc->sc_pc, sc->sc_pcitag, bar); 142 if ((type == PCI_MAPREG_TYPE_MEM) || 143 (type == PCI_MAPREG_TYPE_ROM)) { 144 145 pci_mapreg_info(sc->sc_pc, sc->sc_pcitag, bar, type, 146 &sc->sc_ranges[idx].offset, 147 &sc->sc_ranges[idx].size, 148 &sc->sc_ranges[idx].flags); 149 idx++; 150 } 151 sc->sc_bars[(bar - 0x10) >> 2] = 152 pci_conf_read(sc->sc_pc, sc->sc_pcitag, bar); 153 bar += 4; 154 } 155 sc->sc_ranges_used = idx; 156 157 ops.genfb_ioctl = pci_genfb_ioctl; 158 ops.genfb_mmap = pci_genfb_mmap; 159 ops.genfb_borrow = pci_genfb_borrow; 160 161 if (genfb_attach(&sc->sc_gen, &ops) == 0) { 162 163 /* now try to attach a DRM */ 164 config_found_ia(self, "drm", aux, pci_genfb_drm_print); 165 } 166 } 167 168 static int 169 pci_genfb_drm_print(void *aux, const char *pnp) 170 { 171 if (pnp) 172 aprint_normal("drm at %s", pnp); 173 return (UNCONF); 174 } 175 176 177 static int 178 pci_genfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, 179 struct lwp *l) 180 { 181 struct pci_genfb_softc *sc = v; 182 183 switch (cmd) { 184 case WSDISPLAYIO_GTYPE: 185 *(u_int *)data = WSDISPLAY_TYPE_PCIMISC; 186 return 0; 187 188 /* PCI config read/write passthrough. */ 189 case PCI_IOC_CFGREAD: 190 case PCI_IOC_CFGWRITE: 191 return (pci_devioctl(sc->sc_pc, sc->sc_pcitag, 192 cmd, data, flag, l)); 193 case WSDISPLAYIO_SMODE: 194 { 195 int new_mode = *(int*)data, i; 196 if (new_mode == WSDISPLAYIO_MODE_EMUL) { 197 for (i = 0; i < 9; i++) 198 pci_conf_write(sc->sc_pc, 199 sc->sc_pcitag, 200 0x10 + (i << 2), 201 sc->sc_bars[i]); 202 } 203 } 204 return 0; 205 } 206 207 return EPASSTHROUGH; 208 } 209 210 static paddr_t 211 pci_genfb_mmap(void *v, void *vs, off_t offset, int prot) 212 { 213 struct pci_genfb_softc *sc = v; 214 struct range *r; 215 int i; 216 217 if (offset == 0) 218 sc->sc_want_wsfb = 1; 219 220 /* 221 * regular fb mapping at 0 222 * since some Sun firmware likes to put PCI resources low enough 223 * to collide with the wsfb mapping we only allow it after asking 224 * for offset 0 225 */ 226 DPRINTF("%s: %08x limit %08x\n", __func__, (uint32_t)offset, 227 (uint32_t)sc->sc_gen.sc_fbsize); 228 if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize) && 229 (sc->sc_want_wsfb == 1)) { 230 231 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 232 offset, prot, BUS_SPACE_MAP_LINEAR); 233 } 234 235 /* 236 * restrict all other mappings to processes with superuser privileges 237 * or the kernel itself 238 */ 239 if (kauth_authorize_generic(kauth_cred_get(), KAUTH_GENERIC_ISSUSER, 240 NULL) != 0) { 241 aprint_normal_dev(&sc->sc_gen.sc_dev, "mmap() rejected.\n"); 242 return -1; 243 } 244 245 #ifdef WSFB_FAKE_VGA_FB 246 if ((offset >= 0xa0000) && (offset < 0xbffff)) { 247 248 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, 249 offset - 0xa0000, prot, BUS_SPACE_MAP_LINEAR); 250 } 251 #endif 252 253 /* 254 * XXX this should be generalized, let's just 255 * #define PCI_IOAREA_PADDR 256 * #define PCI_IOAREA_OFFSET 257 * #define PCI_IOAREA_SIZE 258 * somewhere in a MD header and compile this code only if all are 259 * present 260 */ 261 #ifdef PCI_MAGIC_IO_RANGE 262 /* allow to map our IO space */ 263 if ((offset >= PCI_MAGIC_IO_RANGE) && 264 (offset < PCI_MAGIC_IO_RANGE + 0x10000)) { 265 return bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE, 266 0, prot, BUS_SPACE_MAP_LINEAR); 267 } 268 #endif 269 270 /* allow to mmap() our BARs */ 271 /* maybe the ROM BAR too? */ 272 for (i = 0; i < sc->sc_ranges_used; i++) { 273 274 r = &sc->sc_ranges[i]; 275 if ((offset >= r->offset) && (offset < (r->offset + r->size))) { 276 return bus_space_mmap(sc->sc_memt, offset, 0, prot, 277 r->flags); 278 } 279 } 280 281 return -1; 282 } 283 284 int 285 pci_genfb_borrow(void *opaque, bus_addr_t addr, bus_space_handle_t *hdlp) 286 { 287 struct pci_genfb_softc *sc = opaque; 288 289 if (sc == NULL) 290 return 0; 291 if (!sc->sc_gen.sc_fboffset) 292 return 0; 293 if (sc->sc_gen.sc_fboffset != addr) 294 return 0; 295 *hdlp = sc->sc_memh; 296 return 1; 297 } 298