1 /* $NetBSD: mcpcia_dma.c,v 1.26 2021/07/04 22:42:36 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe and Matthew Jacob of the Numerical Aerospace Simulation
9 * Facility, NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
34
35 __KERNEL_RCSID(0, "$NetBSD: mcpcia_dma.c,v 1.26 2021/07/04 22:42:36 thorpej Exp $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/device.h>
41
42 #define _ALPHA_BUS_DMA_PRIVATE
43 #include <sys/bus.h>
44
45 #include <dev/pci/pcireg.h>
46 #include <dev/pci/pcivar.h>
47 #include <alpha/pci/mcpciareg.h>
48 #include <alpha/pci/mcpciavar.h>
49
50 static bus_dma_tag_t mcpcia_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
51
52 static int mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t,
53 void *, bus_size_t, struct proc *, int);
54
55 static int mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
56 struct mbuf *, int);
57
58 static int mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
59 struct uio *, int);
60
61 static int mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
62 bus_dma_segment_t *, int, bus_size_t, int);
63
64 static void mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
65
66 /*
67 * Direct-mapped window: 2G at 2G
68 */
69 #define MCPCIA_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL)
70 #define MCPCIA_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL)
71
72 /*
73 * SGMAP window for PCI: 1G at 1G
74 */
75 #define MCPCIA_PCI_SG_MAPPED_BASE (1UL*1024UL*1024UL*1024UL)
76 #define MCPCIA_PCI_SG_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL)
77
78 /*
79 * SGMAP window for ISA: 8M at 8M
80 */
81 #define MCPCIA_ISA_SG_MAPPED_BASE (8*1024*1024)
82 #define MCPCIA_ISA_SG_MAPPED_SIZE (8*1024*1024)
83
84 /* MCPCIA has a 256-byte out-bound DMA prefetch threshold. */
85 #define MCPCIA_SG_MAPPED_PFTHRESH 256
86
87 #define MCPCIA_SGTLB_INVALIDATE(ccp) \
88 do { \
89 alpha_mb(); \
90 REGVAL(MCPCIA_SG_TBIA(ccp)) = 0xdeadbeef; \
91 alpha_mb(); \
92 } while (0)
93
94 void
mcpcia_dma_init(struct mcpcia_config * ccp)95 mcpcia_dma_init(struct mcpcia_config *ccp)
96 {
97 bus_dma_tag_t t;
98
99 /*
100 * Initialize the DMA tag used for direct-mapped DMA.
101 */
102 t = &ccp->cc_dmat_direct;
103 t->_cookie = ccp;
104 t->_wbase = MCPCIA_DIRECT_MAPPED_BASE;
105 t->_wsize = MCPCIA_DIRECT_MAPPED_SIZE;
106 t->_next_window = &ccp->cc_dmat_pci_sgmap;
107 t->_boundary = 0;
108 t->_sgmap = NULL;
109 t->_get_tag = mcpcia_dma_get_tag;
110 t->_dmamap_create = _bus_dmamap_create;
111 t->_dmamap_destroy = _bus_dmamap_destroy;
112 t->_dmamap_load = _bus_dmamap_load_direct;
113 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
114 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
115 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
116 t->_dmamap_unload = _bus_dmamap_unload;
117 t->_dmamap_sync = _bus_dmamap_sync;
118
119 t->_dmamem_alloc = _bus_dmamem_alloc;
120 t->_dmamem_free = _bus_dmamem_free;
121 t->_dmamem_map = _bus_dmamem_map;
122 t->_dmamem_unmap = _bus_dmamem_unmap;
123 t->_dmamem_mmap = _bus_dmamem_mmap;
124
125 /*
126 * Initialize the DMA tag used for sgmap-mapped PCI DMA.
127 */
128 t = &ccp->cc_dmat_pci_sgmap;
129 t->_cookie = ccp;
130 t->_wbase = MCPCIA_PCI_SG_MAPPED_BASE;
131 t->_wsize = MCPCIA_PCI_SG_MAPPED_SIZE;
132 t->_next_window = NULL;
133 t->_boundary = 0;
134 t->_sgmap = &ccp->cc_pci_sgmap;
135 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH;
136 t->_get_tag = mcpcia_dma_get_tag;
137 t->_dmamap_create = alpha_sgmap_dmamap_create;
138 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
139 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap;
140 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap;
141 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap;
142 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap;
143 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap;
144 t->_dmamap_sync = _bus_dmamap_sync;
145
146 t->_dmamem_alloc = _bus_dmamem_alloc;
147 t->_dmamem_free = _bus_dmamem_free;
148 t->_dmamem_map = _bus_dmamem_map;
149 t->_dmamem_unmap = _bus_dmamem_unmap;
150 t->_dmamem_mmap = _bus_dmamem_mmap;
151
152 /*
153 * Initialize the DMA tag used for sgmap-mapped ISA DMA.
154 */
155 t = &ccp->cc_dmat_isa_sgmap;
156 t->_cookie = ccp;
157 t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE;
158 t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE;
159 t->_next_window = NULL;
160 t->_boundary = 0;
161 t->_sgmap = &ccp->cc_isa_sgmap;
162 t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH;
163 t->_get_tag = mcpcia_dma_get_tag;
164 t->_dmamap_create = alpha_sgmap_dmamap_create;
165 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
166 t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap;
167 t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap;
168 t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap;
169 t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap;
170 t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap;
171 t->_dmamap_sync = _bus_dmamap_sync;
172
173 t->_dmamem_alloc = _bus_dmamem_alloc;
174 t->_dmamem_free = _bus_dmamem_free;
175 t->_dmamem_map = _bus_dmamem_map;
176 t->_dmamem_unmap = _bus_dmamem_unmap;
177 t->_dmamem_mmap = _bus_dmamem_mmap;
178
179 /*
180 * Initialize the SGMAPs.
181 */
182 alpha_sgmap_init(&ccp->cc_dmat_pci_sgmap, &ccp->cc_pci_sgmap,
183 "mcpcia pci sgmap",
184 MCPCIA_PCI_SG_MAPPED_BASE, 0, MCPCIA_PCI_SG_MAPPED_SIZE,
185 sizeof(uint64_t), NULL, 0);
186
187 alpha_sgmap_init(&ccp->cc_dmat_isa_sgmap, &ccp->cc_isa_sgmap,
188 "mcpcia isa sgmap",
189 MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE,
190 sizeof(uint64_t), NULL, 0);
191
192 /*
193 * Disable windows first.
194 */
195
196 REGVAL(MCPCIA_W0_BASE(ccp)) = 0;
197 REGVAL(MCPCIA_W1_BASE(ccp)) = 0;
198 REGVAL(MCPCIA_W2_BASE(ccp)) = 0;
199 REGVAL(MCPCIA_W3_BASE(ccp)) = 0;
200 REGVAL(MCPCIA_T0_BASE(ccp)) = 0;
201 REGVAL(MCPCIA_T1_BASE(ccp)) = 0;
202 REGVAL(MCPCIA_T2_BASE(ccp)) = 0;
203 REGVAL(MCPCIA_T3_BASE(ccp)) = 0;
204 alpha_mb();
205
206 /*
207 * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB.
208 */
209 REGVAL(MCPCIA_W0_MASK(ccp)) = MCPCIA_WMASK_8M;
210 REGVAL(MCPCIA_T0_BASE(ccp)) =
211 ccp->cc_isa_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT;
212 alpha_mb();
213 REGVAL(MCPCIA_W0_BASE(ccp)) =
214 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE;
215 alpha_mb();
216
217 MCPCIA_SGTLB_INVALIDATE(ccp);
218
219 /*
220 * Set up window 1 as a 2 GB Direct-mapped window starting at 2GB.
221 */
222
223 REGVAL(MCPCIA_W1_MASK(ccp)) = MCPCIA_WMASK_2G;
224 REGVAL(MCPCIA_T1_BASE(ccp)) = 0;
225 alpha_mb();
226 REGVAL(MCPCIA_W1_BASE(ccp)) =
227 MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN;
228 alpha_mb();
229
230 /*
231 * Set up window 2 as a 1G SGMAP-mapped window starting at 1G.
232 */
233
234 REGVAL(MCPCIA_W2_MASK(ccp)) = MCPCIA_WMASK_1G;
235 REGVAL(MCPCIA_T2_BASE(ccp)) =
236 ccp->cc_pci_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT;
237 alpha_mb();
238 REGVAL(MCPCIA_W2_BASE(ccp)) =
239 MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_PCI_SG_MAPPED_BASE;
240 alpha_mb();
241 }
242
243 /*
244 * Return the bus dma tag to be used for the specified bus type.
245 * INTERNAL USE ONLY!
246 */
247 static bus_dma_tag_t
mcpcia_dma_get_tag(bus_dma_tag_t t,alpha_bus_t bustype)248 mcpcia_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
249 {
250 struct mcpcia_config *ccp = t->_cookie;
251
252 switch (bustype) {
253 case ALPHA_BUS_PCI:
254 case ALPHA_BUS_EISA:
255 /*
256 * Start off using the direct-mapped window. We will
257 * automatically fall backed onto the chained PCI SGMAP
258 * window if necessary.
259 */
260 return (&ccp->cc_dmat_direct);
261
262 case ALPHA_BUS_ISA:
263 /*
264 * ISA doesn't have enough address bits to use
265 * the direct-mapped DMA window, so we must use
266 * SGMAPs.
267 */
268 return (&ccp->cc_dmat_isa_sgmap);
269
270 default:
271 panic("mcpcia_dma_get_tag: shouldn't be here, really...");
272 }
273 }
274
275 /*
276 * Load a MCPCIA SGMAP-mapped DMA map with a linear buffer.
277 */
278 static int
mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t t,bus_dmamap_t map,void * buf,bus_size_t buflen,struct proc * p,int flags)279 mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
280 {
281 int error;
282 struct mcpcia_config *ccp = t->_cookie;
283
284 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
285 t->_sgmap);
286 if (error == 0)
287 MCPCIA_SGTLB_INVALIDATE(ccp);
288 return (error);
289 }
290
291 /*
292 * Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain.
293 */
294 static int
mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t,bus_dmamap_t map,struct mbuf * m,int flags)295 mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
296 {
297 int error;
298 struct mcpcia_config *ccp = t->_cookie;
299
300 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
301 if (error == 0)
302 MCPCIA_SGTLB_INVALIDATE(ccp);
303 return (error);
304 }
305
306 /*
307 * Load a MCPCIA SGMAP-mapped DMA map with a uio.
308 */
309 static int
mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t,bus_dmamap_t map,struct uio * uio,int flags)310 mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
311 {
312 int error;
313 struct mcpcia_config *ccp = t->_cookie;
314
315 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
316 if (error == 0)
317 MCPCIA_SGTLB_INVALIDATE(ccp);
318 return (error);
319 }
320
321 /*
322 * Load a MCPCIA SGMAP-mapped DMA map with raw memory.
323 */
324 static int
mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t,bus_dmamap_t map,bus_dma_segment_t * segs,int nsegs,bus_size_t size,int flags)325 mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
326 {
327 int error;
328 struct mcpcia_config *ccp = t->_cookie;
329
330 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
331 t->_sgmap);
332 if (error == 0)
333 MCPCIA_SGTLB_INVALIDATE(ccp);
334 return (error);
335 }
336
337 /*
338 * Unload a MCPCIA DMA map.
339 */
340 static void
mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t t,bus_dmamap_t map)341 mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
342 {
343 struct mcpcia_config *ccp = t->_cookie;
344
345 /*
346 * Invalidate any SGMAP page table entries used by this mapping.
347 */
348 pci_sgmap_pte64_unload(t, map, t->_sgmap);
349 MCPCIA_SGTLB_INVALIDATE(ccp);
350
351 /*
352 * Do the generic bits of the unload.
353 */
354 _bus_dmamap_unload_common(t, map);
355 }
356