1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
5  *  Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
6  *
7  *  Trident 4DWave-NX memory page allocation (TLB area)
8  *  Trident chip can handle only 16MByte of the memory at the same time.
9  */
10 
11 #include <linux/io.h>
12 #include <linux/pci.h>
13 #include <linux/time.h>
14 #include <linux/mutex.h>
15 
16 #include <sound/core.h>
17 #include "trident.h"
18 
19 /* page arguments of these two macros are Trident page (4096 bytes), not like
20  * aligned pages in others
21  */
22 #define __set_tlb_bus(trident,page,addr) \
23 	(trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1))
24 #define __tlb_to_addr(trident,page) \
25 	(dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
26 
27 #if PAGE_SIZE == 4096
28 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
29 #define ALIGN_PAGE_SIZE		PAGE_SIZE	/* minimum page size for allocation */
30 #define MAX_ALIGN_PAGES		SNDRV_TRIDENT_MAX_PAGES	/* maxmium aligned pages */
31 /* fill TLB entrie(s) corresponding to page with ptr */
32 #define set_tlb_bus(trident,page,addr) __set_tlb_bus(trident,page,addr)
33 /* fill TLB entrie(s) corresponding to page with silence pointer */
34 #define set_silent_tlb(trident,page)	__set_tlb_bus(trident, page, trident->tlb.silent_page.addr)
35 /* get aligned page from offset address */
36 #define get_aligned_page(offset)	((offset) >> 12)
37 /* get offset address from aligned page */
38 #define aligned_page_offset(page)	((page) << 12)
39 /* get PCI physical address from aligned page */
40 #define page_to_addr(trident,page)	__tlb_to_addr(trident, page)
41 
42 #elif PAGE_SIZE == 8192
43 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
44 #define ALIGN_PAGE_SIZE		PAGE_SIZE
45 #define MAX_ALIGN_PAGES		(SNDRV_TRIDENT_MAX_PAGES / 2)
46 #define get_aligned_page(offset)	((offset) >> 13)
47 #define aligned_page_offset(page)	((page) << 13)
48 #define page_to_addr(trident,page)	__tlb_to_addr(trident, (page) << 1)
49 
50 /* fill TLB entries -- we need to fill two entries */
51 static inline void set_tlb_bus(struct snd_trident *trident, int page,
52 			       dma_addr_t addr)
53 {
54 	page <<= 1;
55 	__set_tlb_bus(trident, page, addr);
56 	__set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE);
57 }
58 static inline void set_silent_tlb(struct snd_trident *trident, int page)
59 {
60 	page <<= 1;
61 	__set_tlb_bus(trident, page, trident->tlb.silent_page.addr);
62 	__set_tlb_bus(trident, page+1, trident->tlb.silent_page.addr);
63 }
64 
65 #else
66 /* arbitrary size */
67 #define UNIT_PAGES		(PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
68 #define ALIGN_PAGE_SIZE		(SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
69 #define MAX_ALIGN_PAGES		(SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
70 /* Note: if alignment doesn't match to the maximum size, the last few blocks
71  * become unusable.  To use such blocks, you'll need to check the validity
72  * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
73  * should also check it, too.
74  */
75 #define get_aligned_page(offset)	((offset) / ALIGN_PAGE_SIZE)
76 #define aligned_page_offset(page)	((page) * ALIGN_PAGE_SIZE)
77 #define page_to_addr(trident,page)	__tlb_to_addr(trident, (page) * UNIT_PAGES)
78 
79 /* fill TLB entries -- UNIT_PAGES entries must be filled */
80 static inline void set_tlb_bus(struct snd_trident *trident, int page,
81 			       dma_addr_t addr)
82 {
83 	int i;
84 	page *= UNIT_PAGES;
85 	for (i = 0; i < UNIT_PAGES; i++, page++) {
86 		__set_tlb_bus(trident, page, addr);
87 		addr += SNDRV_TRIDENT_PAGE_SIZE;
88 	}
89 }
90 static inline void set_silent_tlb(struct snd_trident *trident, int page)
91 {
92 	int i;
93 	page *= UNIT_PAGES;
94 	for (i = 0; i < UNIT_PAGES; i++, page++)
95 		__set_tlb_bus(trident, page, trident->tlb.silent_page.addr);
96 }
97 
98 #endif /* PAGE_SIZE */
99 
100 /* first and last (aligned) pages of memory block */
101 #define firstpg(blk)	(((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
102 #define lastpg(blk)	(((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
103 
104 /*
105  * search empty pages which may contain given size
106  */
107 static struct snd_util_memblk *
108 search_empty(struct snd_util_memhdr *hdr, int size)
109 {
110 	struct snd_util_memblk *blk;
111 	int page, psize;
112 	struct list_head *p;
113 
114 	psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
115 	page = 0;
116 	list_for_each(p, &hdr->block) {
117 		blk = list_entry(p, struct snd_util_memblk, list);
118 		if (page + psize <= firstpg(blk))
119 			goto __found_pages;
120 		page = lastpg(blk) + 1;
121 	}
122 	if (page + psize > MAX_ALIGN_PAGES)
123 		return NULL;
124 
125 __found_pages:
126 	/* create a new memory block */
127 	blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
128 	if (blk == NULL)
129 		return NULL;
130 	blk->offset = aligned_page_offset(page); /* set aligned offset */
131 	firstpg(blk) = page;
132 	lastpg(blk) = page + psize - 1;
133 	return blk;
134 }
135 
136 
137 /*
138  * check if the given pointer is valid for pages
139  */
140 static int is_valid_page(unsigned long ptr)
141 {
142 	if (ptr & ~0x3fffffffUL) {
143 		snd_printk(KERN_ERR "max memory size is 1GB!!\n");
144 		return 0;
145 	}
146 	if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
147 		snd_printk(KERN_ERR "page is not aligned\n");
148 		return 0;
149 	}
150 	return 1;
151 }
152 
153 /*
154  * page allocation for DMA (Scatter-Gather version)
155  */
156 static struct snd_util_memblk *
157 snd_trident_alloc_sg_pages(struct snd_trident *trident,
158 			   struct snd_pcm_substream *substream)
159 {
160 	struct snd_util_memhdr *hdr;
161 	struct snd_util_memblk *blk;
162 	struct snd_pcm_runtime *runtime = substream->runtime;
163 	int idx, page;
164 
165 	if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
166 		       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
167 					SNDRV_TRIDENT_PAGE_SIZE))
168 		return NULL;
169 	hdr = trident->tlb.memhdr;
170 	if (snd_BUG_ON(!hdr))
171 		return NULL;
172 
173 
174 
175 	mutex_lock(&hdr->block_mutex);
176 	blk = search_empty(hdr, runtime->dma_bytes);
177 	if (blk == NULL) {
178 		mutex_unlock(&hdr->block_mutex);
179 		return NULL;
180 	}
181 
182 	/* set TLB entries */
183 	idx = 0;
184 	for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
185 		unsigned long ofs = idx << PAGE_SHIFT;
186 		dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
187 		if (! is_valid_page(addr)) {
188 			__snd_util_mem_free(hdr, blk);
189 			mutex_unlock(&hdr->block_mutex);
190 			return NULL;
191 		}
192 		set_tlb_bus(trident, page, addr);
193 	}
194 	mutex_unlock(&hdr->block_mutex);
195 	return blk;
196 }
197 
198 /*
199  * page allocation for DMA (contiguous version)
200  */
201 static struct snd_util_memblk *
202 snd_trident_alloc_cont_pages(struct snd_trident *trident,
203 			     struct snd_pcm_substream *substream)
204 {
205 	struct snd_util_memhdr *hdr;
206 	struct snd_util_memblk *blk;
207 	int page;
208 	struct snd_pcm_runtime *runtime = substream->runtime;
209 	dma_addr_t addr;
210 
211 	if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
212 		       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
213 					SNDRV_TRIDENT_PAGE_SIZE))
214 		return NULL;
215 	hdr = trident->tlb.memhdr;
216 	if (snd_BUG_ON(!hdr))
217 		return NULL;
218 
219 	mutex_lock(&hdr->block_mutex);
220 	blk = search_empty(hdr, runtime->dma_bytes);
221 	if (blk == NULL) {
222 		mutex_unlock(&hdr->block_mutex);
223 		return NULL;
224 	}
225 
226 	/* set TLB entries */
227 	addr = runtime->dma_addr;
228 	for (page = firstpg(blk); page <= lastpg(blk); page++,
229 	     addr += SNDRV_TRIDENT_PAGE_SIZE) {
230 		if (! is_valid_page(addr)) {
231 			__snd_util_mem_free(hdr, blk);
232 			mutex_unlock(&hdr->block_mutex);
233 			return NULL;
234 		}
235 		set_tlb_bus(trident, page, addr);
236 	}
237 	mutex_unlock(&hdr->block_mutex);
238 	return blk;
239 }
240 
241 /*
242  * page allocation for DMA
243  */
244 struct snd_util_memblk *
245 snd_trident_alloc_pages(struct snd_trident *trident,
246 			struct snd_pcm_substream *substream)
247 {
248 	if (snd_BUG_ON(!trident || !substream))
249 		return NULL;
250 	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
251 		return snd_trident_alloc_sg_pages(trident, substream);
252 	else
253 		return snd_trident_alloc_cont_pages(trident, substream);
254 }
255 
256 
257 /*
258  * release DMA buffer from page table
259  */
260 int snd_trident_free_pages(struct snd_trident *trident,
261 			   struct snd_util_memblk *blk)
262 {
263 	struct snd_util_memhdr *hdr;
264 	int page;
265 
266 	if (snd_BUG_ON(!trident || !blk))
267 		return -EINVAL;
268 
269 	hdr = trident->tlb.memhdr;
270 	mutex_lock(&hdr->block_mutex);
271 	/* reset TLB entries */
272 	for (page = firstpg(blk); page <= lastpg(blk); page++)
273 		set_silent_tlb(trident, page);
274 	/* free memory block */
275 	__snd_util_mem_free(hdr, blk);
276 	mutex_unlock(&hdr->block_mutex);
277 	return 0;
278 }
279