drm_pci.c revision 1.4
1 /* $NetBSD: drm_pci.c,v 1.4 2014/07/16 20:56:25 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: drm_pci.c,v 1.4 2014/07/16 20:56:25 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/errno.h> 37 #include <sys/systm.h> 38 39 #include <dev/pci/pcivar.h> 40 41 #include <drm/drmP.h> 42 43 static int drm_pci_get_irq(struct drm_device *); 44 static int drm_pci_irq_install(struct drm_device *, 45 irqreturn_t (*)(void *), int, const char *, void *, 46 struct drm_bus_irq_cookie **); 47 static void drm_pci_irq_uninstall(struct drm_device *, 48 struct drm_bus_irq_cookie *); 49 static const char * 50 drm_pci_get_name(struct drm_device *); 51 static int drm_pci_set_busid(struct drm_device *, struct drm_master *); 52 static int drm_pci_set_unique(struct drm_device *, struct drm_master *, 53 struct drm_unique *); 54 static int drm_pci_irq_by_busid(struct drm_device *, 55 struct drm_irq_busid *); 56 57 const struct drm_bus drm_pci_bus = { 58 .bus_type = DRIVER_BUS_PCI, 59 .get_irq = drm_pci_get_irq, 60 .irq_install = drm_pci_irq_install, 61 .irq_uninstall = drm_pci_irq_uninstall, 62 .get_name = drm_pci_get_name, 63 .set_busid = drm_pci_set_busid, 64 .set_unique = drm_pci_set_unique, 65 .irq_by_busid = drm_pci_irq_by_busid, 66 }; 67 68 static const struct pci_attach_args * 69 drm_pci_attach_args(struct drm_device *dev) 70 { 71 return &dev->pdev->pd_pa; 72 } 73 74 int 75 drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver __unused) 76 { 77 78 driver->bus = &drm_pci_bus; 79 return 0; 80 } 81 82 void 83 drm_pci_exit(struct drm_driver *driver __unused, 84 struct pci_driver *pdriver __unused) 85 { 86 } 87 88 int 89 drm_pci_attach(device_t self, const struct pci_attach_args *pa, 90 struct pci_dev *pdev, struct drm_driver *driver, unsigned long cookie, 91 struct drm_device **devp) 92 { 93 struct drm_device *dev; 94 unsigned int unit; 95 int ret; 96 97 /* Initialize the Linux PCI device descriptor. */ 98 linux_pci_dev_init(pdev, self, pa, 0); 99 100 /* Create a DRM device. */ 101 dev = drm_dev_alloc(driver, self); 102 if (dev == NULL) { 103 ret = -ENOMEM; 104 goto fail0; 105 } 106 107 dev->pdev = pdev; 108 109 /* XXX Set the power state to D0? */ 110 111 /* Set up the bus space and bus DMA tags. */ 112 dev->bst = pa->pa_memt; 113 /* XXX Let the driver say something about 32-bit vs 64-bit DMA? */ 114 dev->bus_dmat = (pci_dma64_available(pa)? pa->pa_dmat64 : pa->pa_dmat); 115 dev->dmat = dev->bus_dmat; 116 dev->dmat_subregion_p = false; 117 118 /* Find all the memory maps. */ 119 CTASSERT(PCI_NUM_RESOURCES < (SIZE_MAX / sizeof(dev->bus_maps[0]))); 120 dev->bus_maps = kmem_zalloc(PCI_NUM_RESOURCES * 121 sizeof(dev->bus_maps[0]), KM_SLEEP); 122 dev->bus_nmaps = PCI_NUM_RESOURCES; 123 for (unit = 0; unit < PCI_NUM_RESOURCES; unit++) { 124 struct drm_bus_map *const bm = &dev->bus_maps[unit]; 125 const int reg = PCI_BAR(unit); 126 const pcireg_t type = 127 pci_mapreg_type(pa->pa_pc, pa->pa_tag, reg); 128 129 /* Reject non-memory mappings. */ 130 if ((type & PCI_MAPREG_TYPE_MEM) != PCI_MAPREG_TYPE_MEM) { 131 aprint_debug_dev(self, "map %u has non-memory type:" 132 " 0x%"PRIxMAX"\n", unit, (uintmax_t)type); 133 continue; 134 } 135 136 /* Inquire about it. We'll map it in drm_ioremap. */ 137 if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, type, 138 &bm->bm_base, &bm->bm_size, &bm->bm_flags) != 0) { 139 aprint_debug_dev(self, "map %u failed\n", unit); 140 continue; 141 } 142 143 /* Assume since it is a memory mapping it can be linear. */ 144 bm->bm_flags |= BUS_SPACE_MAP_LINEAR; 145 } 146 147 /* Set up AGP stuff if requested. */ 148 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 149 if (drm_pci_device_is_agp(dev)) 150 dev->agp = drm_agp_init(dev); 151 if (dev->agp) 152 dev->agp->agp_mtrr = arch_phys_wc_add(dev->agp->base, 153 dev->agp->agp_info.aki_info.ai_aperture_size); 154 } 155 156 /* Register the DRM device and do driver-specific initialization. */ 157 ret = drm_dev_register(dev, cookie); 158 if (ret) 159 goto fail1; 160 161 /* Success! */ 162 *devp = dev; 163 return 0; 164 165 fail2: __unused 166 drm_dev_unregister(dev); 167 fail1: drm_pci_agp_destroy(dev); 168 dev->bus_nmaps = 0; 169 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 170 KASSERT(!dev->dmat_subregion_p); 171 drm_dev_unref(dev); 172 fail0: return ret; 173 } 174 175 int 176 drm_pci_detach(struct drm_device *dev, int flags __unused) 177 { 178 179 /* Do driver-specific detachment and unregister the device. */ 180 drm_dev_unregister(dev); 181 182 /* Tear down AGP stuff if necessary. */ 183 if (dev->agp) { 184 arch_phys_wc_del(dev->agp->agp_mtrr); 185 drm_agp_clear(dev); 186 kfree(dev->agp); /* XXX Should go in drm_agp_clear... */ 187 dev->agp = NULL; 188 } 189 190 /* Free the record of available bus space mappings. */ 191 dev->bus_nmaps = 0; 192 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 193 194 /* Tear down bus space and bus DMA tags. */ 195 if (dev->dmat_subregion_p) 196 bus_dmatag_destroy(dev->dmat); 197 198 drm_dev_unref(dev); 199 200 return 0; 201 } 202 203 void 204 drm_pci_agp_destroy(struct drm_device *dev) 205 { 206 207 if (dev->agp) { 208 arch_phys_wc_del(dev->agp->agp_mtrr); 209 drm_agp_clear(dev); 210 kfree(dev->agp); /* XXX Should go in drm_agp_clear... */ 211 dev->agp = NULL; 212 } 213 } 214 215 static int 216 drm_pci_get_irq(struct drm_device *dev) 217 { 218 pci_intr_handle_t ih_pih; 219 int ih_int; 220 221 /* 222 * This is a compile-time assertion that the types match. If 223 * this fails, we have to change a bunch of drm code that uses 224 * int for intr handles. 225 */ 226 KASSERT(&ih_pih != &ih_int); 227 228 if (pci_intr_map(drm_pci_attach_args(dev), &ih_pih)) 229 return -1; /* XXX Hope -1 is an invalid intr handle. */ 230 231 ih_int = ih_pih; 232 return ih_int; 233 } 234 235 static int 236 drm_pci_irq_install(struct drm_device *dev, irqreturn_t (*handler)(void *), 237 int flags, const char *name, void *arg, 238 struct drm_bus_irq_cookie **cookiep) 239 { 240 const struct pci_attach_args *const pa = drm_pci_attach_args(dev); 241 pci_intr_handle_t ih; 242 const char *intrstr; 243 void *ih_cookie; 244 char intrbuf[PCI_INTRSTR_LEN]; 245 246 if (pci_intr_map(pa, &ih)) 247 return -ENOENT; 248 249 intrstr = pci_intr_string(pa->pa_pc, ih, intrbuf, sizeof(intrbuf)); 250 ih_cookie = pci_intr_establish(pa->pa_pc, ih, IPL_DRM, handler, arg); 251 if (ih_cookie == NULL) { 252 aprint_error_dev(dev->dev, 253 "couldn't establish interrupt at %s (%s)\n", 254 intrstr, name); 255 return -ENOENT; 256 } 257 258 aprint_normal_dev(dev->dev, "interrupting at %s (%s)\n", 259 intrstr, name); 260 *cookiep = (struct drm_bus_irq_cookie *)ih_cookie; 261 return 0; 262 } 263 264 static void 265 drm_pci_irq_uninstall(struct drm_device *dev, 266 struct drm_bus_irq_cookie *cookie) 267 { 268 const struct pci_attach_args *pa = drm_pci_attach_args(dev); 269 270 pci_intr_disestablish(pa->pa_pc, (void *)cookie); 271 } 272 273 static const char * 274 drm_pci_get_name(struct drm_device *dev) 275 { 276 return "pci"; /* XXX PCI bus names? */ 277 } 278 279 static int 280 drm_pci_format_unique(struct drm_device *dev, char *buf, size_t size) 281 { 282 const unsigned int domain = 0; /* XXX PCI domains? */ 283 const unsigned int bus = dev->pdev->pd_pa.pa_bus; 284 const unsigned int device = dev->pdev->pd_pa.pa_device; 285 const unsigned int function = dev->pdev->pd_pa.pa_function; 286 287 return snprintf(buf, size, "pci:%04x:%02x:%02x.%d", 288 domain, bus, device, function); 289 } 290 291 static int 292 drm_pci_format_devname(struct drm_device *dev, const char *unique, 293 char *buf, size_t size) 294 { 295 296 return snprintf(buf, size, "%s@%s", 297 device_xname(device_parent(dev->dev)), 298 unique); 299 } 300 301 static int 302 drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 303 { 304 int n; 305 char *buf; 306 307 n = drm_pci_format_unique(dev, NULL, 0); 308 if (n < 0) 309 return -ENOSPC; /* XXX */ 310 if (0xff < n) 311 n = 0xff; 312 313 buf = kzalloc(n + 1, GFP_KERNEL); 314 (void)drm_pci_format_unique(dev, buf, n + 1); 315 316 if (master->unique) 317 kfree(master->unique); 318 master->unique = buf; 319 master->unique_len = n; 320 master->unique_size = n + 1; 321 322 n = drm_pci_format_devname(dev, master->unique, NULL, 0); 323 if (n < 0) 324 return -ENOSPC; /* XXX back out? */ 325 if (0xff < n) 326 n = 0xff; 327 328 buf = kzalloc(n + 1, GFP_KERNEL); 329 (void)drm_pci_format_devname(dev, master->unique, buf, n + 1); 330 331 if (dev->devname) 332 kfree(dev->devname); 333 dev->devname = buf; 334 335 return 0; 336 } 337 338 static int 339 drm_pci_set_unique(struct drm_device *dev, struct drm_master *master, 340 struct drm_unique *unique __unused) 341 { 342 343 /* 344 * XXX This is silly. We're supposed to reject unique names 345 * that don't match the ones we would generate anyway. For 346 * expedience, we'll just generate the one we would and ignore 347 * whatever userland threw at us... 348 */ 349 return drm_pci_set_busid(dev, master); 350 } 351 352 static int 353 drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *busid) 354 { 355 return -ENOSYS; /* XXX */ 356 } 357
Indexes created Wed Sep 24 14:09:57 GMT 2025