| 1 | /* $NetBSD: drm_pci.c,v 1.13 2015/04/29 04:38:55 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 1.13 2015/04/29 04:38:55 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 | /* Ensure the drm agp hooks are installed. */ |
| 98 | /* XXX errno NetBSD->Linux */ |
| 99 | ret = -drmkms_pci_agp_guarantee_initialized(); |
| 100 | if (ret) |
| 101 | goto fail0; |
| 102 | |
| 103 | /* Initialize the Linux PCI device descriptor. */ |
| 104 | linux_pci_dev_init(pdev, self, pa, 0); |
| 105 | |
| 106 | /* Create a DRM device. */ |
| 107 | dev = drm_dev_alloc(driver, self); |
| 108 | if (dev == NULL) { |
| 109 | ret = -ENOMEM; |
| 110 | goto fail0; |
| 111 | } |
| 112 | |
| 113 | dev->pdev = pdev; |
| 114 | pdev->pd_drm_dev = dev; /* XXX Nouveau kludge. */ |
| 115 | |
| 116 | /* XXX Set the power state to D0? */ |
| 117 | |
| 118 | /* Set up the bus space and bus DMA tags. */ |
| 119 | dev->bst = pa->pa_memt; |
| 120 | /* XXX Let the driver say something about 32-bit vs 64-bit DMA? */ |
| 121 | dev->bus_dmat = (pci_dma64_available(pa)? pa->pa_dmat64 : pa->pa_dmat); |
| 122 | dev->dmat = dev->bus_dmat; |
| 123 | dev->dmat_subregion_p = false; |
| 124 | |
| 125 | /* Find all the memory maps. */ |
| 126 | CTASSERT(PCI_NUM_RESOURCES < (SIZE_MAX / sizeof(dev->bus_maps[0]))); |
| 127 | dev->bus_maps = kmem_zalloc(PCI_NUM_RESOURCES * |
| 128 | sizeof(dev->bus_maps[0]), KM_SLEEP); |
| 129 | dev->bus_nmaps = PCI_NUM_RESOURCES; |
| 130 | for (unit = 0; unit < PCI_NUM_RESOURCES; unit++) { |
| 131 | struct drm_bus_map *const bm = &dev->bus_maps[unit]; |
| 132 | const int reg = PCI_BAR(unit); |
| 133 | const pcireg_t type = |
| 134 | pci_mapreg_type(pa->pa_pc, pa->pa_tag, reg); |
| 135 | |
| 136 | /* Reject non-memory mappings. */ |
| 137 | if ((type & PCI_MAPREG_TYPE_MEM) != PCI_MAPREG_TYPE_MEM) { |
| 138 | aprint_debug_dev(self, "map %u has non-memory type:" |
| 139 | " 0x%" PRIxMAX"\n" , unit, (uintmax_t)type); |
| 140 | continue; |
| 141 | } |
| 142 | |
| 143 | /* Inquire about it. We'll map it in drm_core_ioremap. */ |
| 144 | if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, type, |
| 145 | &bm->bm_base, &bm->bm_size, &bm->bm_flags) != 0) { |
| 146 | aprint_debug_dev(self, "map %u failed\n" , unit); |
| 147 | continue; |
| 148 | } |
| 149 | |
| 150 | /* Assume since it is a memory mapping it can be linear. */ |
| 151 | bm->bm_flags |= BUS_SPACE_MAP_LINEAR; |
| 152 | } |
| 153 | |
| 154 | /* Set up AGP stuff if requested. */ |
| 155 | if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { |
| 156 | if (drm_pci_device_is_agp(dev)) |
| 157 | dev->agp = drm_agp_init(dev); |
| 158 | if (dev->agp) |
| 159 | dev->agp->agp_mtrr = arch_phys_wc_add(dev->agp->base, |
| 160 | dev->agp->agp_info.aki_info.ai_aperture_size); |
| 161 | } |
| 162 | |
| 163 | /* Register the DRM device and do driver-specific initialization. */ |
| 164 | ret = drm_dev_register(dev, cookie); |
| 165 | if (ret) |
| 166 | goto fail1; |
| 167 | |
| 168 | /* Success! */ |
| 169 | *devp = dev; |
| 170 | return 0; |
| 171 | |
| 172 | fail2: __unused |
| 173 | drm_dev_unregister(dev); |
| 174 | fail1: drm_pci_agp_destroy(dev); |
| 175 | dev->bus_nmaps = 0; |
| 176 | kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); |
| 177 | if (dev->dmat_subregion_p) |
| 178 | bus_dmatag_destroy(dev->dmat); |
| 179 | drm_dev_unref(dev); |
| 180 | fail0: return ret; |
| 181 | } |
| 182 | |
| 183 | int |
| 184 | drm_pci_detach(struct drm_device *dev, int flags __unused) |
| 185 | { |
| 186 | |
| 187 | /* Do driver-specific detachment and unregister the device. */ |
| 188 | drm_dev_unregister(dev); |
| 189 | |
| 190 | /* Tear down AGP stuff if necessary. */ |
| 191 | drm_pci_agp_destroy(dev); |
| 192 | |
| 193 | /* Free the record of available bus space mappings. */ |
| 194 | dev->bus_nmaps = 0; |
| 195 | kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); |
| 196 | |
| 197 | /* Tear down bus space and bus DMA tags. */ |
| 198 | if (dev->dmat_subregion_p) |
| 199 | bus_dmatag_destroy(dev->dmat); |
| 200 | |
| 201 | drm_dev_unref(dev); |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | void |
| 207 | drm_pci_agp_destroy(struct drm_device *dev) |
| 208 | { |
| 209 | |
| 210 | if (dev->agp) { |
| 211 | arch_phys_wc_del(dev->agp->agp_mtrr); |
| 212 | drm_agp_clear(dev); |
| 213 | kfree(dev->agp); /* XXX Should go in drm_agp_clear... */ |
| 214 | dev->agp = NULL; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | static int |
| 219 | drm_pci_get_irq(struct drm_device *dev) |
| 220 | { |
| 221 | |
| 222 | /* |
| 223 | * Caller expects a nonzero int, and doesn't really use it for |
| 224 | * anything, so no need to pci_intr_map here. |
| 225 | */ |
| 226 | return dev->pdev->pd_pa.pa_intrpin; |
| 227 | } |
| 228 | |
| 229 | static int |
| 230 | drm_pci_irq_install(struct drm_device *dev, irqreturn_t (*handler)(void *), |
| 231 | int flags, const char *name, void *arg, |
| 232 | struct drm_bus_irq_cookie **cookiep) |
| 233 | { |
| 234 | const struct pci_attach_args *const pa = drm_pci_attach_args(dev); |
| 235 | pci_intr_handle_t ih; |
| 236 | const char *intrstr; |
| 237 | void *ih_cookie; |
| 238 | char intrbuf[PCI_INTRSTR_LEN]; |
| 239 | |
| 240 | if (pci_intr_map(pa, &ih)) |
| 241 | return -ENOENT; |
| 242 | |
| 243 | intrstr = pci_intr_string(pa->pa_pc, ih, intrbuf, sizeof(intrbuf)); |
| 244 | ih_cookie = pci_intr_establish(pa->pa_pc, ih, IPL_DRM, handler, arg); |
| 245 | if (ih_cookie == NULL) { |
| 246 | aprint_error_dev(dev->dev, |
| 247 | "couldn't establish interrupt at %s (%s)\n" , |
| 248 | intrstr, name); |
| 249 | return -ENOENT; |
| 250 | } |
| 251 | |
| 252 | aprint_normal_dev(dev->dev, "interrupting at %s (%s)\n" , |
| 253 | intrstr, name); |
| 254 | *cookiep = (struct drm_bus_irq_cookie *)ih_cookie; |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | static void |
| 259 | drm_pci_irq_uninstall(struct drm_device *dev, |
| 260 | struct drm_bus_irq_cookie *cookie) |
| 261 | { |
| 262 | const struct pci_attach_args *pa = drm_pci_attach_args(dev); |
| 263 | |
| 264 | pci_intr_disestablish(pa->pa_pc, (void *)cookie); |
| 265 | } |
| 266 | |
| 267 | static const char * |
| 268 | drm_pci_get_name(struct drm_device *dev) |
| 269 | { |
| 270 | return "pci" ; /* XXX PCI bus names? */ |
| 271 | } |
| 272 | |
| 273 | static int |
| 274 | drm_pci_format_unique(struct drm_device *dev, char *buf, size_t size) |
| 275 | { |
| 276 | const unsigned int domain = device_unit(device_parent(dev->dev)); |
| 277 | const unsigned int bus = dev->pdev->pd_pa.pa_bus; |
| 278 | const unsigned int device = dev->pdev->pd_pa.pa_device; |
| 279 | const unsigned int function = dev->pdev->pd_pa.pa_function; |
| 280 | |
| 281 | return snprintf(buf, size, "pci:%04x:%02x:%02x.%d" , |
| 282 | domain, bus, device, function); |
| 283 | } |
| 284 | |
| 285 | static int |
| 286 | drm_pci_format_devname(struct drm_device *dev, const char *unique, |
| 287 | char *buf, size_t size) |
| 288 | { |
| 289 | |
| 290 | return snprintf(buf, size, "%s@%s" , |
| 291 | device_xname(device_parent(dev->dev)), |
| 292 | unique); |
| 293 | } |
| 294 | |
| 295 | static int |
| 296 | drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) |
| 297 | { |
| 298 | int n; |
| 299 | char *buf; |
| 300 | |
| 301 | n = drm_pci_format_unique(dev, NULL, 0); |
| 302 | if (n < 0) |
| 303 | return -ENOSPC; /* XXX */ |
| 304 | if (0xff < n) |
| 305 | n = 0xff; |
| 306 | |
| 307 | buf = kzalloc(n + 1, GFP_KERNEL); |
| 308 | (void)drm_pci_format_unique(dev, buf, n + 1); |
| 309 | |
| 310 | if (master->unique) |
| 311 | kfree(master->unique); |
| 312 | master->unique = buf; |
| 313 | master->unique_len = n; |
| 314 | master->unique_size = n + 1; |
| 315 | |
| 316 | n = drm_pci_format_devname(dev, master->unique, NULL, 0); |
| 317 | if (n < 0) |
| 318 | return -ENOSPC; /* XXX back out? */ |
| 319 | if (0xff < n) |
| 320 | n = 0xff; |
| 321 | |
| 322 | buf = kzalloc(n + 1, GFP_KERNEL); |
| 323 | (void)drm_pci_format_devname(dev, master->unique, buf, n + 1); |
| 324 | |
| 325 | if (dev->devname) |
| 326 | kfree(dev->devname); |
| 327 | dev->devname = buf; |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | drm_pci_set_unique(struct drm_device *dev, struct drm_master *master, |
| 334 | struct drm_unique *unique __unused) |
| 335 | { |
| 336 | |
| 337 | /* |
| 338 | * XXX This is silly. We're supposed to reject unique names |
| 339 | * that don't match the ones we would generate anyway. For |
| 340 | * expedience, we'll just generate the one we would and ignore |
| 341 | * whatever userland threw at us... |
| 342 | */ |
| 343 | return drm_pci_set_busid(dev, master); |
| 344 | } |
| 345 | |
| 346 | static int |
| 347 | drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *busid) |
| 348 | { |
| 349 | return -ENOSYS; /* XXX */ |
| 350 | } |
| 351 | |