drivers/media/pci/saa7164/saa7164-buffer.c

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/slab.h>
  23
  24 #include "saa7164.h"
  25
  26 /* The PCI address space for buffer handling looks like this:
  27  *
  28  * +-u32 wide-------------+
  29  * |                      +
  30  * +-u64 wide------------------------------------+
  31  * +                                             +
  32  * +----------------------+
  33  * | CurrentBufferPtr     + Pointer to current PCI buffer >-+
  34  * +----------------------+                                 |
  35  * | Unused               +                                 |
  36  * +----------------------+                                 |
  37  * | Pitch                + = 188 (bytes)                   |
  38  * +----------------------+                                 |
  39  * | PCI buffer size      + = pitch * number of lines (312) |
  40  * +----------------------+                                 |
  41  * |0| Buf0 Write Offset  +                                 |
  42  * +----------------------+                                 v
  43  * |1| Buf1 Write Offset  +                                 |
  44  * +----------------------+                                 |
  45  * |2| Buf2 Write Offset  +                                 |
  46  * +----------------------+                                 |
  47  * |3| Buf3 Write Offset  +                                 |
  48  * +----------------------+                                 |
  49  * ... More write offsets                                   |
  50  * +---------------------------------------------+          |
  51  * +0| set of ptrs to PCI pagetables             +          |
  52  * +---------------------------------------------+          |
  53  * +1| set of ptrs to PCI pagetables             + <--------+
  54  * +---------------------------------------------+
  55  * +2| set of ptrs to PCI pagetables             +
  56  * +---------------------------------------------+
  57  * +3| set of ptrs to PCI pagetables             + >--+
  58  * +---------------------------------------------+    |
  59  * ... More buffer pointers                           |  +----------------+
  60  *                                                  +->| pt[0] TS data  |
  61  *                                                  |  +----------------+
  62  *                                                  |
  63  *                                                  |  +----------------+
  64  *                                                  +->| pt[1] TS data  |
  65  *                                                  |  +----------------+
  66  *                                                  | etc
  67  */
  68
  69 void saa7164_buffer_display(struct saa7164_buffer *buf)
  70 {
  71         struct saa7164_dev *dev = buf->port->dev;
  72         int i;
  73
  74         dprintk(DBGLVL_BUF, "%s()   buffer @ 0x%p nr=%d\n",
  75                 __func__, buf, buf->idx);
  76         dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08llx len = 0x%x\n",
  77                 buf->cpu, (long long)buf->dma, buf->pci_size);
  78         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
  79                 buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
  80
  81         /* Format the Page Table Entries to point into the data buffer */
  82         for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
  83
  84                 dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
  85                         i, buf->pt_cpu, (u64)*(buf->pt_cpu));
  86
  87         }
  88 }
  89 /* Allocate a new buffer structure and associated PCI space in bytes.
  90  * len must be a multiple of sizeof(u64)
  91  */
  92 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
  93         u32 len)
  94 {
  95         struct tmHWStreamParameters *params = &port->hw_streamingparams;
  96         struct saa7164_buffer *buf = NULL;
  97         struct saa7164_dev *dev = port->dev;
  98         int i;
  99
 100         if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
 101                 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
 102                 goto ret;
 103         }
 104
 105         buf = kzalloc(sizeof(struct saa7164_buffer), GFP_KERNEL);
 106         if (!buf) {
 107                 log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
 108                 goto ret;
 109         }
 110
 111         buf->idx = -1;
 112         buf->port = port;
 113         buf->flags = SAA7164_BUFFER_FREE;
 114         buf->pos = 0;
 115         buf->actual_size = params->pitch * params->numberoflines;
 116         buf->crc = 0;
 117         /* TODO: arg len is being ignored */
 118         buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
 119         buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
 120
 121         /* Allocate contiguous memory */
 122         buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
 123                 &buf->dma);
 124         if (!buf->cpu)
 125                 goto fail1;
 126
 127         buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
 128                 &buf->pt_dma);
 129         if (!buf->pt_cpu)
 130                 goto fail2;
 131
 132         /* init the buffers to a known pattern, easier during debugging */
 133         memset_io(buf->cpu, 0xff, buf->pci_size);
 134         buf->crc = crc32(0, buf->cpu, buf->actual_size);
 135         memset_io(buf->pt_cpu, 0xff, buf->pt_size);
 136
 137         dprintk(DBGLVL_BUF, "%s()   allocated buffer @ 0x%p (%d pageptrs)\n",
 138                 __func__, buf, params->numpagetables);
 139         dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08lx len = 0x%x\n",
 140                 buf->cpu, (long)buf->dma, buf->pci_size);
 141         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
 142                 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
 143
 144         /* Format the Page Table Entries to point into the data buffer */
 145         for (i = 0 ; i < params->numpagetables; i++) {
 146
 147                 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
 148                 dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
 149                         i, buf->pt_cpu, (u64)*(buf->pt_cpu));
 150
 151         }
 152
 153         goto ret;
 154
 155 fail2:
 156         pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
 157 fail1:
 158         kfree(buf);
 159
 160         buf = NULL;
 161 ret:
 162         return buf;
 163 }
 164
 165 int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
 166 {
 167         struct saa7164_dev *dev;
 168
 169         if (!buf || !buf->port)
 170                 return SAA_ERR_BAD_PARAMETER;
 171         dev = buf->port->dev;
 172
 173         dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
 174                 __func__, buf);
 175
 176         if (buf->flags != SAA7164_BUFFER_FREE)
 177                 log_warn(" freeing a non-free buffer\n");
 178
 179         pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
 180         pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
 181
 182         kfree(buf);
 183
 184         return SAA_OK;
 185 }
 186
 187 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
 188 {
 189         struct saa7164_dev *dev = port->dev;
 190
 191         if ((i < 0) || (i >= port->hwcfg.buffercount))
 192                 return -EINVAL;
 193
 194         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 195
 196         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 197
 198         return 0;
 199 }
 200
 201 /* Write a buffer into the hardware */
 202 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
 203 {
 204         struct saa7164_port *port = buf->port;
 205         struct saa7164_dev *dev = port->dev;
 206
 207         if ((i < 0) || (i >= port->hwcfg.buffercount))
 208                 return -EINVAL;
 209
 210         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 211
 212         buf->idx = i; /* Note of which buffer list index position we occupy */
 213         buf->flags = SAA7164_BUFFER_BUSY;
 214         buf->pos = 0;
 215
 216         /* TODO: Review this in light of 32v64 assignments */
 217         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 218         saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
 219         saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
 220
 221         dprintk(DBGLVL_BUF, "   buf[%d] offset 0x%llx (0x%x) "
 222                 "buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
 223                 buf->idx,
 224                 (u64)port->bufoffset + (i * sizeof(u32)),
 225                 saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
 226                 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
 227                 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
 228                 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
 229                 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
 230                 buf->idx);
 231
 232         return 0;
 233 }
 234
 235 int saa7164_buffer_cfg_port(struct saa7164_port *port)
 236 {
 237         struct tmHWStreamParameters *params = &port->hw_streamingparams;
 238         struct saa7164_dev *dev = port->dev;
 239         struct saa7164_buffer *buf;
 240         struct list_head *c, *n;
 241         int i = 0;
 242
 243         dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
 244
 245         saa7164_writel(port->bufcounter, 0);
 246         saa7164_writel(port->pitch, params->pitch);
 247         saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
 248
 249         dprintk(DBGLVL_BUF, " configured:\n");
 250         dprintk(DBGLVL_BUF, "   lmmio       0x%p\n", dev->lmmio);
 251         dprintk(DBGLVL_BUF, "   bufcounter  0x%x = 0x%x\n", port->bufcounter,
 252                 saa7164_readl(port->bufcounter));
 253
 254         dprintk(DBGLVL_BUF, "   pitch       0x%x = %d\n", port->pitch,
 255                 saa7164_readl(port->pitch));
 256
 257         dprintk(DBGLVL_BUF, "   bufsize     0x%x = %d\n", port->bufsize,
 258                 saa7164_readl(port->bufsize));
 259
 260         dprintk(DBGLVL_BUF, "   buffercount = %d\n", port->hwcfg.buffercount);
 261         dprintk(DBGLVL_BUF, "   bufoffset = 0x%x\n", port->bufoffset);
 262         dprintk(DBGLVL_BUF, "   bufptr32h = 0x%x\n", port->bufptr32h);
 263         dprintk(DBGLVL_BUF, "   bufptr32l = 0x%x\n", port->bufptr32l);
 264
 265         /* Poke the buffers and offsets into PCI space */
 266         mutex_lock(&port->dmaqueue_lock);
 267         list_for_each_safe(c, n, &port->dmaqueue.list) {
 268                 buf = list_entry(c, struct saa7164_buffer, list);
 269
 270                 if (buf->flags != SAA7164_BUFFER_FREE)
 271                         BUG();
 272
 273                 /* Place the buffer in the h/w queue */
 274                 saa7164_buffer_activate(buf, i);
 275
 276                 /* Don't exceed the device maximum # bufs */
 277                 if (i++ > port->hwcfg.buffercount)
 278                         BUG();
 279
 280         }
 281         mutex_unlock(&port->dmaqueue_lock);
 282
 283         return 0;
 284 }
 285
 286 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
 287         u32 len)
 288 {
 289         struct saa7164_user_buffer *buf;
 290
 291         buf = kzalloc(sizeof(struct saa7164_user_buffer), GFP_KERNEL);
 292         if (!buf)
 293                 return NULL;
 294
 295         buf->data = kzalloc(len, GFP_KERNEL);
 296
 297         if (!buf->data) {
 298                 kfree(buf);
 299                 return NULL;
 300         }
 301
 302         buf->actual_size = len;
 303         buf->pos = 0;
 304         buf->crc = 0;
 305
 306         dprintk(DBGLVL_BUF, "%s()   allocated user buffer @ 0x%p\n",
 307                 __func__, buf);
 308
 309         return buf;
 310 }
 311
 312 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
 313 {
 314         if (!buf)
 315                 return;
 316
 317         kfree(buf->data);
 318         buf->data = NULL;
 319
 320         kfree(buf);
 321 }
 322