blob: 7e503adacea0b152e3149b7bd83ff9d498303af6 [file] [log] [blame]
Hans Verkuil1a0adaf2007-04-27 12:31:25 -03001/*
2 User DMA
3
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include "ivtv-driver.h"
24#include "ivtv-streams.h"
25#include "ivtv-udma.h"
26
27void ivtv_udma_get_page_info(struct ivtv_dma_page_info *dma_page, unsigned long first, unsigned long size)
28{
29 dma_page->uaddr = first & PAGE_MASK;
30 dma_page->offset = first & ~PAGE_MASK;
31 dma_page->tail = 1 + ((first+size-1) & ~PAGE_MASK);
32 dma_page->first = (first & PAGE_MASK) >> PAGE_SHIFT;
33 dma_page->last = ((first+size-1) & PAGE_MASK) >> PAGE_SHIFT;
34 dma_page->page_count = dma_page->last - dma_page->first + 1;
35 if (dma_page->page_count == 1) dma_page->tail -= dma_page->offset;
36}
37
38int ivtv_udma_fill_sg_list (struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map_offset)
39{
40 int i, offset;
Hans Verkuil0989fd2c2007-08-19 12:25:39 -030041 unsigned long flags;
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030042
Hans Verkuil8beb0582007-08-19 17:56:41 -030043 if (map_offset < 0)
44 return map_offset;
45
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030046 offset = dma_page->offset;
47
48 /* Fill SG Array with new values */
49 for (i = 0; i < dma_page->page_count; i++) {
Hans Verkuil0989fd2c2007-08-19 12:25:39 -030050 unsigned int len = (i == dma_page->page_count - 1) ?
51 dma_page->tail : PAGE_SIZE - offset;
52
53 dma->SGlist[map_offset].length = len;
54 dma->SGlist[map_offset].offset = offset;
55 if (PageHighMem(dma->map[map_offset])) {
56 void *src;
57
58 if (dma->bouncemap[map_offset] == NULL)
59 dma->bouncemap[map_offset] = alloc_page(GFP_KERNEL);
60 if (dma->bouncemap[map_offset] == NULL)
Hans Verkuil8beb0582007-08-19 17:56:41 -030061 return -1;
Hans Verkuil0989fd2c2007-08-19 12:25:39 -030062 local_irq_save(flags);
63 src = kmap_atomic(dma->map[map_offset], KM_BOUNCE_READ) + offset;
64 memcpy(page_address(dma->bouncemap[map_offset]) + offset, src, len);
65 kunmap_atomic(src, KM_BOUNCE_READ);
66 local_irq_restore(flags);
67 dma->SGlist[map_offset].page = dma->bouncemap[map_offset];
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030068 }
69 else {
Hans Verkuil0989fd2c2007-08-19 12:25:39 -030070 dma->SGlist[map_offset].page = dma->map[map_offset];
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030071 }
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030072 offset = 0;
73 map_offset++;
74 }
Hans Verkuil8beb0582007-08-19 17:56:41 -030075 return map_offset;
Hans Verkuil1a0adaf2007-04-27 12:31:25 -030076}
77
78void ivtv_udma_fill_sg_array (struct ivtv_user_dma *dma, u32 buffer_offset, u32 buffer_offset_2, u32 split) {
79 int i;
80 struct scatterlist *sg;
81
82 for (i = 0, sg = dma->SGlist; i < dma->SG_length; i++, sg++) {
83 dma->SGarray[i].size = cpu_to_le32(sg_dma_len(sg));
84 dma->SGarray[i].src = cpu_to_le32(sg_dma_address(sg));
85 dma->SGarray[i].dst = cpu_to_le32(buffer_offset);
86 buffer_offset += sg_dma_len(sg);
87
88 split -= sg_dma_len(sg);
89 if (split == 0)
90 buffer_offset = buffer_offset_2;
91 }
92}
93
94/* User DMA Buffers */
95void ivtv_udma_alloc(struct ivtv *itv)
96{
97 if (itv->udma.SG_handle == 0) {
98 /* Map DMA Page Array Buffer */
99 itv->udma.SG_handle = pci_map_single(itv->dev, itv->udma.SGarray,
100 sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
101 ivtv_udma_sync_for_cpu(itv);
102 }
103}
104
105int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
106 void __user *userbuf, int size_in_bytes)
107{
108 struct ivtv_dma_page_info user_dma;
109 struct ivtv_user_dma *dma = &itv->udma;
Hans Verkuil0989fd2c2007-08-19 12:25:39 -0300110 int i, err;
Hans Verkuil1a0adaf2007-04-27 12:31:25 -0300111
112 IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr);
113
114 /* Still in USE */
115 if (dma->SG_length || dma->page_count) {
116 IVTV_DEBUG_WARN("ivtv_udma_setup: SG_length %d page_count %d still full?\n",
117 dma->SG_length, dma->page_count);
118 return -EBUSY;
119 }
120
121 ivtv_udma_get_page_info(&user_dma, (unsigned long)userbuf, size_in_bytes);
122
123 if (user_dma.page_count <= 0) {
124 IVTV_DEBUG_WARN("ivtv_udma_setup: Error %d page_count from %d bytes %d offset\n",
125 user_dma.page_count, size_in_bytes, user_dma.offset);
126 return -EINVAL;
127 }
128
129 /* Get user pages for DMA Xfer */
130 down_read(&current->mm->mmap_sem);
131 err = get_user_pages(current, current->mm,
132 user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
133 up_read(&current->mm->mmap_sem);
134
135 if (user_dma.page_count != err) {
136 IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
137 err, user_dma.page_count);
138 return -EINVAL;
139 }
140
141 dma->page_count = user_dma.page_count;
142
143 /* Fill SG List with new values */
Hans Verkuil8beb0582007-08-19 17:56:41 -0300144 if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {
Hans Verkuil0989fd2c2007-08-19 12:25:39 -0300145 for (i = 0; i < dma->page_count; i++) {
146 put_page(dma->map[i]);
147 }
148 dma->page_count = 0;
Hans Verkuil8beb0582007-08-19 17:56:41 -0300149 return -ENOMEM;
Hans Verkuil0989fd2c2007-08-19 12:25:39 -0300150 }
Hans Verkuil1a0adaf2007-04-27 12:31:25 -0300151
152 /* Map SG List */
153 dma->SG_length = pci_map_sg(itv->dev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
154
155 /* Fill SG Array with new values */
156 ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1);
157
158 /* Tag SG Array with Interrupt Bit */
159 dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
160
161 ivtv_udma_sync_for_device(itv);
162 return dma->page_count;
163}
164
165void ivtv_udma_unmap(struct ivtv *itv)
166{
167 struct ivtv_user_dma *dma = &itv->udma;
168 int i;
169
170 IVTV_DEBUG_INFO("ivtv_unmap_user_dma\n");
171
172 /* Nothing to free */
173 if (dma->page_count == 0)
174 return;
175
176 /* Unmap Scatterlist */
177 if (dma->SG_length) {
178 pci_unmap_sg(itv->dev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
179 dma->SG_length = 0;
180 }
181 /* sync DMA */
182 ivtv_udma_sync_for_cpu(itv);
183
184 /* Release User Pages */
185 for (i = 0; i < dma->page_count; i++) {
186 put_page(dma->map[i]);
187 }
188 dma->page_count = 0;
189}
190
191void ivtv_udma_free(struct ivtv *itv)
192{
Hans Verkuil0989fd2c2007-08-19 12:25:39 -0300193 int i;
194
Hans Verkuil1a0adaf2007-04-27 12:31:25 -0300195 /* Unmap SG Array */
196 if (itv->udma.SG_handle) {
197 pci_unmap_single(itv->dev, itv->udma.SG_handle,
198 sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
199 }
200
201 /* Unmap Scatterlist */
202 if (itv->udma.SG_length) {
203 pci_unmap_sg(itv->dev, itv->udma.SGlist, itv->udma.page_count, PCI_DMA_TODEVICE);
204 }
Hans Verkuil0989fd2c2007-08-19 12:25:39 -0300205
206 for (i = 0; i < IVTV_DMA_SG_OSD_ENT; i++) {
207 if (itv->udma.bouncemap[i])
208 __free_page(itv->udma.bouncemap[i]);
209 }
Hans Verkuil1a0adaf2007-04-27 12:31:25 -0300210}
211
212void ivtv_udma_start(struct ivtv *itv)
213{
214 IVTV_DEBUG_DMA("start UDMA\n");
215 write_reg(itv->udma.SG_handle, IVTV_REG_DECDMAADDR);
216 write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x01, IVTV_REG_DMAXFER);
217 set_bit(IVTV_F_I_DMA, &itv->i_flags);
218 set_bit(IVTV_F_I_UDMA, &itv->i_flags);
219}
220
221void ivtv_udma_prepare(struct ivtv *itv)
222{
223 unsigned long flags;
224
225 spin_lock_irqsave(&itv->dma_reg_lock, flags);
226 if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
227 ivtv_udma_start(itv);
228 else
229 set_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags);
230 spin_unlock_irqrestore(&itv->dma_reg_lock, flags);
231}