Annotation of sys/arch/alpha/pci/apecs_dma.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: apecs_dma.c,v 1.5 2006/04/04 21:20:40 brad Exp $ */
2: /* $NetBSD: apecs_dma.c,v 1.13 2000/06/29 08:58:45 mrg Exp $ */
3:
4: /*-
5: * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
10: * NASA Ames Research Center.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: /*
42: * XXX - We should define this before including bus.h, but since other stuff
43: * pulls in bus.h we must do this here.
44: */
45: #define _ALPHA_BUS_DMA_PRIVATE
46:
47: #include <sys/param.h>
48: #include <sys/systm.h>
49: #include <sys/kernel.h>
50: #include <sys/device.h>
51: #include <sys/malloc.h>
52:
53: #include <uvm/uvm_extern.h>
54:
55: #include <machine/bus.h>
56:
57: #include <dev/pci/pcireg.h>
58: #include <dev/pci/pcivar.h>
59: #include <alpha/pci/apecsreg.h>
60: #include <alpha/pci/apecsvar.h>
61:
62: bus_dma_tag_t apecs_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
63:
64: int apecs_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
65: bus_size_t, struct proc *, int);
66:
67: int apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
68: struct mbuf *, int);
69:
70: int apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
71: struct uio *, int);
72:
73: int apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
74: bus_dma_segment_t *, int, bus_size_t, int);
75:
76: void apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
77:
78: /*
79: * Direct-mapped window: 1G at 1G
80: */
81: #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024)
82: #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024)
83:
84: /*
85: * SGMAP window: 8M at 8M
86: */
87: #define APECS_SGMAP_MAPPED_BASE (8*1024*1024)
88: #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024)
89:
90: /* APECS has a 256-byte out-bound DMA prefetch threshold. */
91: #define APECS_SGMAP_PFTHRESH 256
92:
93: /*
94: * Macro to flush APECS scatter/gather TLB.
95: */
96: #define APECS_TLB_INVALIDATE() \
97: do { \
98: alpha_mb(); \
99: REGVAL(EPIC_TBIA) = 0; \
100: alpha_mb(); \
101: } while (0)
102:
103: void
104: apecs_dma_init(acp)
105: struct apecs_config *acp;
106: {
107: bus_addr_t tbase;
108: bus_dma_tag_t t;
109:
110: /*
111: * Initialize the DMA tag used for direct-mapped DMA.
112: */
113: t = &acp->ac_dmat_direct;
114: t->_cookie = acp;
115: t->_wbase = APECS_DIRECT_MAPPED_BASE;
116: t->_wsize = APECS_DIRECT_MAPPED_SIZE;
117: t->_next_window = NULL;
118: t->_boundary = 0;
119: t->_sgmap = NULL;
120: t->_get_tag = apecs_dma_get_tag;
121: t->_dmamap_create = _bus_dmamap_create;
122: t->_dmamap_destroy = _bus_dmamap_destroy;
123: t->_dmamap_load = _bus_dmamap_load_direct;
124: t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
125: t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
126: t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
127: t->_dmamap_unload = _bus_dmamap_unload;
128: t->_dmamap_sync = _bus_dmamap_sync;
129:
130: t->_dmamem_alloc = _bus_dmamem_alloc;
131: t->_dmamem_free = _bus_dmamem_free;
132: t->_dmamem_map = _bus_dmamem_map;
133: t->_dmamem_unmap = _bus_dmamem_unmap;
134: t->_dmamem_mmap = _bus_dmamem_mmap;
135:
136: /*
137: * Initialize the DMA tag used for sgmap-mapped DMA.
138: */
139: t = &acp->ac_dmat_sgmap;
140: t->_cookie = acp;
141: t->_wbase = APECS_SGMAP_MAPPED_BASE;
142: t->_wsize = APECS_SGMAP_MAPPED_SIZE;
143: t->_next_window = NULL;
144: t->_boundary = 0;
145: t->_sgmap = &acp->ac_sgmap;
146: t->_pfthresh = APECS_SGMAP_PFTHRESH;
147: t->_get_tag = apecs_dma_get_tag;
148: t->_dmamap_create = alpha_sgmap_dmamap_create;
149: t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
150: t->_dmamap_load = apecs_bus_dmamap_load_sgmap;
151: t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap;
152: t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap;
153: t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap;
154: t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap;
155: t->_dmamap_sync = _bus_dmamap_sync;
156:
157: t->_dmamem_alloc = _bus_dmamem_alloc;
158: t->_dmamem_free = _bus_dmamem_free;
159: t->_dmamem_map = _bus_dmamem_map;
160: t->_dmamem_unmap = _bus_dmamem_unmap;
161: t->_dmamem_mmap = _bus_dmamem_mmap;
162:
163: /*
164: * The firmware has set up window 2 as a 1G direct-mapped DMA
165: * window beginning at 1G. We leave it alone. Disable
166: * window 1.
167: */
168: REGVAL(EPIC_PCI_BASE_1) = 0;
169: alpha_mb();
170:
171: /*
172: * Initialize the SGMAP.
173: */
174: alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap",
175: APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE,
176: sizeof(u_int64_t), NULL, 0);
177:
178: /*
179: * Set up window 1 as an 8MB SGMAP-mapped window
180: * starting at 8MB.
181: */
182: REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE |
183: EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB;
184: alpha_mb();
185:
186: REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M;
187: alpha_mb();
188:
189: tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT;
190: if ((tbase & EPIC_TBASE_T_BASE) != tbase)
191: panic("apecs_dma_init: bad page table address");
192: REGVAL(EPIC_TBASE_1) = tbase;
193: alpha_mb();
194:
195: APECS_TLB_INVALIDATE();
196:
197: /* XXX XXX BEGIN XXX XXX */
198: { /* XXX */
199: extern paddr_t alpha_XXX_dmamap_or; /* XXX */
200: alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */
201: } /* XXX */
202: /* XXX XXX END XXX XXX */
203: }
204:
205: /*
206: * Return the bus dma tag to be used for the specified bus type.
207: * INTERNAL USE ONLY!
208: */
209: bus_dma_tag_t
210: apecs_dma_get_tag(t, bustype)
211: bus_dma_tag_t t;
212: alpha_bus_t bustype;
213: {
214: struct apecs_config *acp = t->_cookie;
215:
216: switch (bustype) {
217: case ALPHA_BUS_PCI:
218: case ALPHA_BUS_EISA:
219: /*
220: * Systems with an APECS can only support 1G
221: * of memory, so we use the direct-mapped window
222: * on busses that have 32-bit DMA.
223: */
224: return (&acp->ac_dmat_direct);
225:
226: case ALPHA_BUS_ISA:
227: /*
228: * ISA doesn't have enough address bits to use
229: * the direct-mapped DMA window, so we must use
230: * SGMAPs.
231: */
232: return (&acp->ac_dmat_sgmap);
233:
234: default:
235: panic("apecs_dma_get_tag: shouldn't be here, really...");
236: }
237: }
238:
239: /*
240: * Load an APECS SGMAP-mapped DMA map with a linear buffer.
241: */
242: int
243: apecs_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags)
244: bus_dma_tag_t t;
245: bus_dmamap_t map;
246: void *buf;
247: bus_size_t buflen;
248: struct proc *p;
249: int flags;
250: {
251: int error;
252:
253: error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
254: t->_sgmap);
255: if (error == 0)
256: APECS_TLB_INVALIDATE();
257:
258: return (error);
259: }
260:
261: /*
262: * Load an APECS SGMAP-mapped DMA map with an mbuf chain.
263: */
264: int
265: apecs_bus_dmamap_load_mbuf_sgmap(t, map, m, flags)
266: bus_dma_tag_t t;
267: bus_dmamap_t map;
268: struct mbuf *m;
269: int flags;
270: {
271: int error;
272:
273: error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
274: if (error == 0)
275: APECS_TLB_INVALIDATE();
276:
277: return (error);
278: }
279:
280: /*
281: * Load an APECS SGMAP-mapped DMA map with a uio.
282: */
283: int
284: apecs_bus_dmamap_load_uio_sgmap(t, map, uio, flags)
285: bus_dma_tag_t t;
286: bus_dmamap_t map;
287: struct uio *uio;
288: int flags;
289: {
290: int error;
291:
292: error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
293: if (error == 0)
294: APECS_TLB_INVALIDATE();
295:
296: return (error);
297: }
298:
299: /*
300: * Load an APECS SGMAP-mapped DMA map with raw memory.
301: */
302: int
303: apecs_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags)
304: bus_dma_tag_t t;
305: bus_dmamap_t map;
306: bus_dma_segment_t *segs;
307: int nsegs;
308: bus_size_t size;
309: int flags;
310: {
311: int error;
312:
313: error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
314: t->_sgmap);
315: if (error == 0)
316: APECS_TLB_INVALIDATE();
317:
318: return (error);
319: }
320:
321: /*
322: * Unload an APECS DMA map.
323: */
324: void
325: apecs_bus_dmamap_unload_sgmap(t, map)
326: bus_dma_tag_t t;
327: bus_dmamap_t map;
328: {
329:
330: /*
331: * Invalidate any SGMAP page table entries used by this
332: * mapping.
333: */
334: pci_sgmap_pte64_unload(t, map, t->_sgmap);
335: APECS_TLB_INVALIDATE();
336:
337: /*
338: * Do the generic bits of the unload.
339: */
340: _bus_dmamap_unload(t, map);
341: }
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