Annotation of sys/arch/alpha/pci/lca_dma.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: lca_dma.c,v 1.7 2006/04/04 21:20:40 brad Exp $ */
2: /* $NetBSD: lca_dma.c,v 1.13 2000/06/29 08:58:47 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/lcareg.h>
60: #include <alpha/pci/lcavar.h>
61:
62: bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
63:
64: int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
65: bus_size_t, struct proc *, int);
66:
67: int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
68: struct mbuf *, int);
69:
70: int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
71: struct uio *, int);
72:
73: int lca_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 lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
77:
78: /*
79: * Direct-mapped window: 1G at 1G
80: */
81: #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024)
82: #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024)
83:
84: /*
85: * SGMAP window: 8M at 8M
86: */
87: #define LCA_SGMAP_MAPPED_BASE (8*1024*1024)
88: #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024)
89:
90: /*
91: * The LCA doesn't have a DMA prefetch threshold. However, it is known
92: * to lose if we don't allocate a spill page. So initialize it to 256.
93: */
94: #define LCA_SGMAP_PFTHRESH 256
95:
96: /*
97: * Macro to flush LCA scatter/gather TLB.
98: */
99: #define LCA_TLB_INVALIDATE() \
100: do { \
101: alpha_mb(); \
102: REGVAL64(LCA_IOC_TBIA) = 0; \
103: alpha_mb(); \
104: } while (0)
105:
106: void
107: lca_dma_init(lcp)
108: struct lca_config *lcp;
109: {
110: bus_dma_tag_t t;
111:
112: /*
113: * Initialize the DMA tag used for direct-mapped DMA.
114: */
115: t = &lcp->lc_dmat_direct;
116: t->_cookie = lcp;
117: t->_wbase = LCA_DIRECT_MAPPED_BASE;
118: t->_wsize = LCA_DIRECT_MAPPED_SIZE;
119: t->_next_window = NULL;
120: t->_boundary = 0;
121: t->_sgmap = NULL;
122: t->_get_tag = lca_dma_get_tag;
123: t->_dmamap_create = _bus_dmamap_create;
124: t->_dmamap_destroy = _bus_dmamap_destroy;
125: t->_dmamap_load = _bus_dmamap_load_direct;
126: t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
127: t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
128: t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
129: t->_dmamap_unload = _bus_dmamap_unload;
130: t->_dmamap_sync = _bus_dmamap_sync;
131:
132: t->_dmamem_alloc = _bus_dmamem_alloc;
133: t->_dmamem_free = _bus_dmamem_free;
134: t->_dmamem_map = _bus_dmamem_map;
135: t->_dmamem_unmap = _bus_dmamem_unmap;
136: t->_dmamem_mmap = _bus_dmamem_mmap;
137:
138: /*
139: * Initialize the DMA tag used for sgmap-mapped DMA.
140: */
141: t = &lcp->lc_dmat_sgmap;
142: t->_cookie = lcp;
143: t->_wbase = LCA_SGMAP_MAPPED_BASE;
144: t->_wsize = LCA_SGMAP_MAPPED_SIZE;
145: t->_next_window = NULL;
146: t->_boundary = 0;
147: t->_sgmap = &lcp->lc_sgmap;
148: t->_pfthresh = LCA_SGMAP_PFTHRESH;
149: t->_get_tag = lca_dma_get_tag;
150: t->_dmamap_create = alpha_sgmap_dmamap_create;
151:
152: t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
153: t->_dmamap_load = lca_bus_dmamap_load_sgmap;
154: t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap;
155: t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap;
156: t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap;
157: t->_dmamap_unload = lca_bus_dmamap_unload_sgmap;
158: t->_dmamap_sync = _bus_dmamap_sync;
159:
160: t->_dmamem_alloc = _bus_dmamem_alloc;
161: t->_dmamem_free = _bus_dmamem_free;
162: t->_dmamem_map = _bus_dmamem_map;
163: t->_dmamem_unmap = _bus_dmamem_unmap;
164: t->_dmamem_mmap = _bus_dmamem_mmap;
165:
166: /*
167: * The firmware has set up window 1 as a 1G direct-mapped DMA
168: * window beginning at 1G. We leave it alone. Disable
169: * window 0.
170: */
171: REGVAL64(LCA_IOC_W_BASE0) = 0;
172: alpha_mb();
173:
174: /*
175: * Initialize the SGMAP.
176: */
177: alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap",
178: LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE,
179: sizeof(u_int64_t), NULL, 0);
180:
181: /*
182: * Set up window 0 as an 8MB SGMAP-mapped window
183: * starting at 8MB.
184: */
185: REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE |
186: IOC_W_BASE_SG | IOC_W_BASE_WEN;
187: alpha_mb();
188:
189: REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M;
190: alpha_mb();
191:
192: if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) !=
193: lcp->lc_sgmap.aps_ptpa)
194: panic("lca_dma_init: bad page table address");
195: REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa;
196: alpha_mb();
197:
198: /* Enable the scatter/gather TLB. */
199: REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN;
200: alpha_mb();
201:
202: LCA_TLB_INVALIDATE();
203:
204: /* XXX XXX BEGIN XXX XXX */
205: { /* XXX */
206: extern paddr_t alpha_XXX_dmamap_or; /* XXX */
207: alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */
208: } /* XXX */
209: /* XXX XXX END XXX XXX */
210: }
211:
212: /*
213: * Return the bus dma tag to be used for the specified bus type.
214: * INTERNAL USE ONLY!
215: */
216: bus_dma_tag_t
217: lca_dma_get_tag(t, bustype)
218: bus_dma_tag_t t;
219: alpha_bus_t bustype;
220: {
221: struct lca_config *lcp = t->_cookie;
222:
223: switch (bustype) {
224: case ALPHA_BUS_PCI:
225: case ALPHA_BUS_EISA:
226: /*
227: * Systems with an LCA can only support 1G
228: * of memory, so we use the direct-mapped window
229: * on busses that have 32-bit DMA.
230: */
231: return (&lcp->lc_dmat_direct);
232:
233: case ALPHA_BUS_ISA:
234: /*
235: * ISA doesn't have enough address bits to use
236: * the direct-mapped DMA window, so we must use
237: * SGMAPs.
238: */
239: return (&lcp->lc_dmat_sgmap);
240:
241: default:
242: panic("lca_dma_get_tag: shouldn't be here, really...");
243: }
244: }
245:
246: /*
247: * Load an LCA SGMAP-mapped DMA map with a linear buffer.
248: */
249: int
250: lca_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags)
251: bus_dma_tag_t t;
252: bus_dmamap_t map;
253: void *buf;
254: bus_size_t buflen;
255: struct proc *p;
256: int flags;
257: {
258: int error;
259:
260: error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
261: t->_sgmap);
262: if (error == 0)
263: LCA_TLB_INVALIDATE();
264:
265: return (error);
266: }
267:
268: /*
269: * Load an LCA SGMAP-mapped DMA map with an mbuf chain.
270: */
271: int
272: lca_bus_dmamap_load_mbuf_sgmap(t, map, m, flags)
273: bus_dma_tag_t t;
274: bus_dmamap_t map;
275: struct mbuf *m;
276: int flags;
277: {
278: int error;
279:
280: error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
281: if (error == 0)
282: LCA_TLB_INVALIDATE();
283:
284: return (error);
285: }
286:
287: /*
288: * Load an LCA SGMAP-mapped DMA map with a uio.
289: */
290: int
291: lca_bus_dmamap_load_uio_sgmap(t, map, uio, flags)
292: bus_dma_tag_t t;
293: bus_dmamap_t map;
294: struct uio *uio;
295: int flags;
296: {
297: int error;
298:
299: error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
300: if (error == 0)
301: LCA_TLB_INVALIDATE();
302:
303: return (error);
304: }
305:
306: /*
307: * Load an LCA SGMAP-mapped DMA map with raw memory.
308: */
309: int
310: lca_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags)
311: bus_dma_tag_t t;
312: bus_dmamap_t map;
313: bus_dma_segment_t *segs;
314: int nsegs;
315: bus_size_t size;
316: int flags;
317: {
318: int error;
319:
320: error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
321: t->_sgmap);
322: if (error == 0)
323: LCA_TLB_INVALIDATE();
324:
325: return (error);
326: }
327:
328: /*
329: * Unload an LCA DMA map.
330: */
331: void
332: lca_bus_dmamap_unload_sgmap(t, map)
333: bus_dma_tag_t t;
334: bus_dmamap_t map;
335: {
336:
337: /*
338: * Invalidate any SGMAP page table entries used by this
339: * mapping.
340: */
341: pci_sgmap_pte64_unload(t, map, t->_sgmap);
342: LCA_TLB_INVALIDATE();
343:
344: /*
345: * Do the generic bits of the unload.
346: */
347: _bus_dmamap_unload(t, map);
348: }
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