2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2000 Doug Rabson
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
39 #include <sys/mutex.h>
42 #include <dev/agp/agppriv.h>
43 #include <dev/agp/agpreg.h>
44 #include <dev/pci/pcivar.h>
45 #include <dev/pci/pcireg.h>
48 #include <vm/vm_extern.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_object.h>
52 #include <machine/bus.h>
53 #include <machine/resource.h>
56 MALLOC_DECLARE(M_AGP);
58 #define READ2(off) bus_space_read_2(sc->bst, sc->bsh, off)
59 #define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off)
60 #define WRITE2(off,v) bus_space_write_2(sc->bst, sc->bsh, off, v)
61 #define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v)
65 u_int32_t *ag_virtual; /* virtual address of gatt */
66 vm_offset_t ag_physical;
67 u_int32_t *ag_vdir; /* virtual address of page dir */
68 vm_offset_t ag_pdir; /* physical address of page dir */
71 struct agp_amd_softc {
73 struct resource *regs; /* memory mapped control registers */
74 bus_space_tag_t bst; /* bus_space tag */
75 bus_space_handle_t bsh; /* bus_space handle */
76 u_int32_t initial_aperture; /* aperture size at startup */
77 struct agp_amd_gatt *gatt;
80 static struct agp_amd_gatt *
81 agp_amd_alloc_gatt(device_t dev)
83 u_int32_t apsize = AGP_GET_APERTURE(dev);
84 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
85 struct agp_amd_gatt *gatt;
86 int i, npages, pdir_offset;
90 "allocating GATT for aperture of size %dM\n",
91 apsize / (1024*1024));
93 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
98 * The AMD751 uses a page directory to map a non-contiguous
99 * gatt so we don't need to use kmem_alloc_contig.
100 * Allocate individual GATT pages and map them into the page
103 gatt->ag_entries = entries;
104 gatt->ag_virtual = (void *)kmem_alloc_attr(entries * sizeof(u_int32_t),
105 M_NOWAIT | M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
106 if (!gatt->ag_virtual) {
108 device_printf(dev, "allocation failed\n");
114 * Allocate the page directory.
116 gatt->ag_vdir = (void *)kmem_alloc_attr(AGP_PAGE_SIZE, M_NOWAIT |
117 M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
118 if (!gatt->ag_vdir) {
121 "failed to allocate page directory\n");
122 kmem_free((vm_offset_t)gatt->ag_virtual, entries *
128 gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
130 device_printf(dev, "gatt -> ag_pdir %#lx\n",
131 (u_long)gatt->ag_pdir);
133 * Allocate the gatt pages
135 gatt->ag_entries = entries;
137 device_printf(dev, "allocating GATT for %d AGP page entries\n",
140 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
143 * Map the pages of the GATT into the page directory.
145 * The GATT page addresses are mapped into the directory offset by
146 * an amount dependent on the base address of the aperture. This
147 * is and offset into the page directory, not an offset added to
148 * the addresses of the gatt pages.
151 pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
153 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
156 for (i = 0; i < npages; i++) {
160 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
162 gatt->ag_vdir[i + pdir_offset] = pa | 1;
169 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
171 kmem_free((vm_offset_t)gatt->ag_vdir, AGP_PAGE_SIZE);
172 kmem_free((vm_offset_t)gatt->ag_virtual, gatt->ag_entries *
178 agp_amd_match(device_t dev)
180 if (pci_get_class(dev) != PCIC_BRIDGE
181 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
184 if (agp_find_caps(dev) == 0)
187 switch (pci_get_devid(dev)) {
189 return ("AMD 751 host to AGP bridge");
191 return ("AMD 761 host to AGP bridge");
193 return ("AMD 762 host to AGP bridge");
200 agp_amd_probe(device_t dev)
204 if (resource_disabled("agp", device_get_unit(dev)))
206 desc = agp_amd_match(dev);
208 device_set_desc(dev, desc);
209 return BUS_PROBE_DEFAULT;
216 agp_amd_attach(device_t dev)
218 struct agp_amd_softc *sc = device_get_softc(dev);
219 struct agp_amd_gatt *gatt;
222 error = agp_generic_attach(dev);
226 rid = AGP_AMD751_REGISTERS;
227 sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
230 agp_generic_detach(dev);
234 sc->bst = rman_get_bustag(sc->regs);
235 sc->bsh = rman_get_bushandle(sc->regs);
237 sc->initial_aperture = AGP_GET_APERTURE(dev);
240 gatt = agp_amd_alloc_gatt(dev);
245 * Probably contigmalloc failure. Try reducing the
246 * aperture so that the gatt size reduces.
248 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
253 /* Install the gatt. */
254 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_pdir);
256 /* Enable synchronisation between host and agp. */
257 pci_write_config(dev,
259 AGP_AMD751_MODECTRL_SYNEN, 1);
261 /* Set indexing mode for two-level and enable page dir cache */
262 pci_write_config(dev,
263 AGP_AMD751_MODECTRL2,
264 AGP_AMD751_MODECTRL2_GPDCE, 1);
266 /* Enable the TLB and flush */
267 WRITE2(AGP_AMD751_STATUS,
268 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
275 agp_amd_detach(device_t dev)
277 struct agp_amd_softc *sc = device_get_softc(dev);
281 /* Disable the TLB.. */
282 WRITE2(AGP_AMD751_STATUS,
283 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
285 /* Disable host-agp sync */
286 pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
288 /* Clear the GATT base */
289 WRITE4(AGP_AMD751_ATTBASE, 0);
291 /* Put the aperture back the way it started. */
292 AGP_SET_APERTURE(dev, sc->initial_aperture);
294 agp_amd_free_gatt(sc->gatt);
297 bus_release_resource(dev, SYS_RES_MEMORY,
298 AGP_AMD751_REGISTERS, sc->regs);
304 agp_amd_get_aperture(device_t dev)
309 * The aperture size is equal to 32M<<vas.
311 vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
312 return (32*1024*1024) << vas;
316 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
321 * Check for a power of two and make sure its within the
322 * programmable range.
324 if (aperture & (aperture - 1)
325 || aperture < 32*1024*1024
326 || aperture > 2U*1024*1024*1024)
329 vas = ffs(aperture / 32*1024*1024) - 1;
332 * While the size register is bits 1-3 of APCTRL, bit 0 must be
333 * set for the size value to be 'valid'
335 pci_write_config(dev, AGP_AMD751_APCTRL,
336 (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
337 | ((vas << 1) | 1))), 1);
343 agp_amd_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
345 struct agp_amd_softc *sc = device_get_softc(dev);
347 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
350 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
355 agp_amd_unbind_page(device_t dev, vm_offset_t offset)
357 struct agp_amd_softc *sc = device_get_softc(dev);
359 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
362 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
367 agp_amd_flush_tlb(device_t dev)
369 struct agp_amd_softc *sc = device_get_softc(dev);
371 /* Set the cache invalidate bit and wait for the chipset to clear */
372 WRITE4(AGP_AMD751_TLBCTRL, 1);
375 } while (READ4(AGP_AMD751_TLBCTRL));
378 static device_method_t agp_amd_methods[] = {
379 /* Device interface */
380 DEVMETHOD(device_probe, agp_amd_probe),
381 DEVMETHOD(device_attach, agp_amd_attach),
382 DEVMETHOD(device_detach, agp_amd_detach),
383 DEVMETHOD(device_shutdown, bus_generic_shutdown),
384 DEVMETHOD(device_suspend, bus_generic_suspend),
385 DEVMETHOD(device_resume, bus_generic_resume),
388 DEVMETHOD(agp_get_aperture, agp_amd_get_aperture),
389 DEVMETHOD(agp_set_aperture, agp_amd_set_aperture),
390 DEVMETHOD(agp_bind_page, agp_amd_bind_page),
391 DEVMETHOD(agp_unbind_page, agp_amd_unbind_page),
392 DEVMETHOD(agp_flush_tlb, agp_amd_flush_tlb),
393 DEVMETHOD(agp_enable, agp_generic_enable),
394 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
395 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
396 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
397 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
401 static driver_t agp_amd_driver = {
404 sizeof(struct agp_amd_softc),
407 static devclass_t agp_devclass;
409 DRIVER_MODULE(agp_amd, hostb, agp_amd_driver, agp_devclass, 0, 0);
410 MODULE_DEPEND(agp_amd, agp, 1, 1, 1);
411 MODULE_DEPEND(agp_amd, pci, 1, 1, 1);