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 | |