1 /* $NetBSD: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1997, 1998 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 of the Numerical Aerospace Simulation Facility,
9 * 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: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej Exp $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/device.h>
41 #include <sys/kmem.h>
42
43 #define _ALPHA_BUS_DMA_PRIVATE
44 #include <sys/bus.h>
45
46 #include <dev/pci/pcireg.h>
47 #include <dev/pci/pcivar.h>
48 #include <alpha/tlsb/tlsbreg.h>
49 #include <alpha/tlsb/kftxxvar.h>
50 #include <alpha/tlsb/kftxxreg.h>
51 #include <alpha/pci/dwlpxreg.h>
52 #include <alpha/pci/dwlpxvar.h>
53
54 static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
55
56 static int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
57 bus_size_t, struct proc *, int);
58
59 static int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
60 struct mbuf *, int);
61
62 static int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
63 struct uio *, int);
64
65 static int dwlpx_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
66 bus_dma_segment_t *, int, bus_size_t, int);
67
68 static void dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
69
70 /*
71 * Direct-mapped window: 2G at 2G
72 */
73 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL)
74 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL)
75
76 /*
77 * SGMAP window A: 256M or 1G at 1G
78 */
79 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024)
80 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE)
81
82 /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */
83 #define DWLPx_SG_MAPPED_PFTHRESH 256
84
85 /*
86 * Set this to always use SGMAPs.
87 */
88 #ifdef DWLPX_ALWAYS_USE_SGMAP
89 int dwlpx_always_use_sgmap = 1;
90 #else
91 int dwlpx_always_use_sgmap = 0;
92 #endif
93
94 void
dwlpx_dma_init(struct dwlpx_config * ccp)95 dwlpx_dma_init(struct dwlpx_config *ccp)
96 {
97 char *exname;
98 bus_dma_tag_t t;
99 uint32_t *page_table;
100 int i, lim, wmask;
101
102 /*
103 * Determine size of Window C based on the amount of SGMAP
104 * page table SRAM available.
105 */
106 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) {
107 lim = 128 * 1024;
108 wmask = PCIA_WMASK_1G;
109 } else {
110 lim = 32 * 1024;
111 wmask = PCIA_WMASK_256M;
112 }
113
114 /*
115 * Initialize the DMA tag used for direct-mapped DMA. Chain
116 * this window to the SGMAP window, because we might have
117 * a lot of memory in the machine.
118 */
119 t = &ccp->cc_dmat_direct;
120 t->_cookie = ccp;
121 t->_wbase = DWLPx_DIRECT_MAPPED_BASE;
122 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE;
123 t->_next_window = &ccp->cc_dmat_sgmap;
124 t->_boundary = 0;
125 t->_sgmap = NULL;
126 t->_get_tag = dwlpx_dma_get_tag;
127 t->_dmamap_create = _bus_dmamap_create;
128 t->_dmamap_destroy = _bus_dmamap_destroy;
129 t->_dmamap_load = _bus_dmamap_load_direct;
130 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
131 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
132 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
133 t->_dmamap_unload = _bus_dmamap_unload;
134 t->_dmamap_sync = _bus_dmamap_sync;
135
136 t->_dmamem_alloc = _bus_dmamem_alloc;
137 t->_dmamem_free = _bus_dmamem_free;
138 t->_dmamem_map = _bus_dmamem_map;
139 t->_dmamem_unmap = _bus_dmamem_unmap;
140 t->_dmamem_mmap = _bus_dmamem_mmap;
141
142 /*
143 * Initialize the DMA tag used for sgmap-mapped DMA.
144 */
145 t = &ccp->cc_dmat_sgmap;
146 t->_cookie = ccp;
147 t->_wbase = DWLPx_SG_MAPPED_BASE;
148 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim);
149 t->_next_window = NULL;
150 t->_boundary = 0;
151 t->_sgmap = &ccp->cc_sgmap;
152 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH;
153 t->_get_tag = dwlpx_dma_get_tag;
154 t->_dmamap_create = alpha_sgmap_dmamap_create;
155 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
156 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap;
157 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap;
158 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap;
159 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap;
160 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap;
161 t->_dmamap_sync = _bus_dmamap_sync;
162
163 t->_dmamem_alloc = _bus_dmamem_alloc;
164 t->_dmamem_free = _bus_dmamem_free;
165 t->_dmamem_map = _bus_dmamem_map;
166 t->_dmamem_unmap = _bus_dmamem_unmap;
167 t->_dmamem_mmap = _bus_dmamem_mmap;
168
169 /*
170 * A few notes about SGMAP-mapped DMA on the DWLPx:
171 *
172 * The DWLPx has PCIA-resident SRAM that is used for
173 * the SGMAP page table; there is no TLB. The DWLPA
174 * has room for 32K entries, yielding a total of 256M
175 * of sgva space. The DWLPB has 32K entries or 128K
176 * entries, depending on TBIT, yielding either 256M or
177 * 1G of sgva space.
178 *
179 * This sgva space must be shared across all windows
180 * that wish to use SGMAP-mapped DMA; make sure to
181 * adjust the "sgvabase" argument to alpha_sgmap_init()
182 * accordingly if you create more than one SGMAP-mapped
183 * window. Note that sgvabase != window base. The former
184 * is used to compute indexes into the page table only.
185 *
186 * In the current implementation the first window is a
187 * 2G window direct-mapped mapped at 2G and the second
188 * window is disabled and the third window is a 256M
189 * or 1GB scatter/gather map at 1GB.
190 *
191 * We just punt on trying to support ISA DMA. If you want
192 * try that on a TurboLaser, well, you just lose.
193 */
194
195 /*
196 * Initialize the page table.
197 */
198 page_table =
199 (uint32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase);
200 for (i = 0; i < lim; i++)
201 page_table[i * SGMAP_PTE_SPACING] = 0;
202 alpha_mb();
203
204 /*
205 * Initialize the SGMAP for window C:
206 *
207 * Size: 256M or 1GB
208 * Window base: 1GB
209 * SGVA base: 0
210 */
211 exname = kmem_asprintf("%s_sgmap_a",
212 device_xname(ccp->cc_sc->dwlpx_dev));
213 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE,
214 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(uint32_t),
215 (void *)page_table, 0);
216
217 /*
218 * Set up DMA windows for this DWLPx.
219 *
220 * Do this even for all HPCs- even for the nonexistent
221 * one on hose zero of a KFTIA.
222 */
223 for (i = 0; i < NHPC; i++) {
224 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G;
225 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0;
226 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) =
227 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN;
228
229 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0;
230 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0;
231 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0;
232
233 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask;
234 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0;
235 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) =
236 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN;
237 alpha_mb();
238 }
239 }
240
241 /*
242 * Return the bus dma tag to be used for the specified bus type.
243 * INTERNAL USE ONLY!
244 */
245 static bus_dma_tag_t
dwlpx_dma_get_tag(bus_dma_tag_t t,alpha_bus_t bustype)246 dwlpx_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
247 {
248 struct dwlpx_config *ccp = t->_cookie;
249
250 switch (bustype) {
251 case ALPHA_BUS_PCI:
252 case ALPHA_BUS_EISA:
253 if (dwlpx_always_use_sgmap) {
254 /*
255 * Always use SGMAPs (for testing purposes?)
256 */
257 return (&ccp->cc_dmat_sgmap);
258 }
259 /*
260 * Give these busses the direct-mapped window; if the
261 * address crosses the threshold, it will fall back
262 * onto the SGMAP window.
263 */
264 return (&ccp->cc_dmat_direct);
265
266 case ALPHA_BUS_ISA:
267 /*
268 * Don't even bother; it's not easy, given how the
269 * page table is arranged, and it's not really worth
270 * the trouble.
271 */
272 panic("dwlpx_dma_get_tag: ISA DMA? Forget it...");
273 /* NOTREACHED */
274
275 default:
276 panic("dwlpx_dma_get_tag: shouldn't be here, really...");
277 }
278 }
279
280 /*
281 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer.
282 */
283 static int
dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t,bus_dmamap_t map,void * buf,bus_size_t buflen,struct proc * p,int flags)284 dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
285 {
286
287 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags,
288 t->_sgmap));
289 }
290
291 /*
292 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain.
293 */
294 static int
dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t,bus_dmamap_t map,struct mbuf * m,int flags)295 dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
296 {
297
298 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap));
299 }
300
301 /*
302 * Load a DWLPx SGMAP-mapped DMA map with a uio.
303 */
304 static int
dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t,bus_dmamap_t map,struct uio * uio,int flags)305 dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
306 {
307
308 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap));
309 }
310
311 /*
312 * Load a DWLPx SGMAP-mapped DMA map with raw memory.
313 */
314 static int
dwlpx_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)315 dwlpx_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)
316 {
317
318 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags,
319 t->_sgmap));
320 }
321
322 /*
323 * Unload a DWLPx DMA map.
324 */
325 static void
dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t,bus_dmamap_t map)326 dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
327 {
328
329 /*
330 * Invalidate any SGMAP page table entries used by this
331 * mapping.
332 */
333 pci_sgmap_pte32_unload(t, map, t->_sgmap);
334
335 /*
336 * Do the generic bits of the unload.
337 */
338 _bus_dmamap_unload_common(t, map);
339 }
340