drivers/media/video/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%p len = 0x%x\n",
  77                 buf->cpu, (void *)buf->dma, buf->pci_size);
  78         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%p len = 0x%x\n",
  79                 buf->pt_cpu, (void *)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         tmHWStreamParameters_t *params = &port->hw_streamingparams;
  96         struct saa7164_buffer *buf = 0;
  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 == NULL) {
 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         /* TODO: arg len is being ignored */
 117         buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
 118         buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
 119
 120         /* Allocate contiguous memory */
 121         buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
 122                 &buf->dma);
 123         if (!buf->cpu)
 124                 goto fail1;
 125
 126         buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
 127                 &buf->pt_dma);
 128         if (!buf->pt_cpu)
 129                 goto fail2;
 130
 131         /* init the buffers to a known pattern, easier during debugging */
 132         memset(buf->cpu, 0xff, buf->pci_size);
 133         memset(buf->pt_cpu, 0xff, buf->pt_size);
 134
 135         dprintk(DBGLVL_BUF, "%s()   allocated buffer @ 0x%p\n",
 136                 __func__, buf);
 137         dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08lx len = 0x%x\n",
 138                 buf->cpu, (long)buf->dma, buf->pci_size);
 139         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
 140                 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
 141
 142         /* Format the Page Table Entries to point into the data buffer */
 143         for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
 144
 145                 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
 146
 147         }
 148
 149         goto ret;
 150
 151 fail2:
 152         pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
 153 fail1:
 154         kfree(buf);
 155
 156         buf = 0;
 157 ret:
 158         return buf;
 159 }
 160
 161 int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
 162 {
 163         struct saa7164_dev *dev;
 164
 165         if (!buf || !buf->port)
 166                 return SAA_ERR_BAD_PARAMETER;
 167         dev = buf->port->dev;
 168
 169         dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
 170                 __func__, buf);
 171
 172         if (buf->flags != SAA7164_BUFFER_FREE)
 173                 log_warn(" freeing a non-free buffer\n");
 174
 175         pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
 176         pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
 177
 178         kfree(buf);
 179
 180         return SAA_OK;
 181 }
 182
 183 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
 184 {
 185         struct saa7164_dev *dev = port->dev;
 186
 187         if ((i < 0) || (i >= port->hwcfg.buffercount))
 188                 return -EINVAL;
 189
 190         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 191
 192         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 193
 194         return 0;
 195 }
 196
 197 /* Write a buffer into the hardware */
 198 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
 199 {
 200         struct saa7164_port *port = buf->port;
 201         struct saa7164_dev *dev = port->dev;
 202
 203         if ((i < 0) || (i >= port->hwcfg.buffercount))
 204                 return -EINVAL;
 205
 206         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 207
 208         buf->idx = i; /* Note of which buffer list index position we occupy */
 209         buf->flags = SAA7164_BUFFER_BUSY;
 210         buf->pos = 0;
 211
 212         /* TODO: Review this in light of 32v64 assignments */
 213         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 214         saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
 215         saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
 216
 217         dprintk(DBGLVL_BUF, "   buf[%d] offset 0x%llx (0x%x) "
 218                 "buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
 219                 buf->idx,
 220                 (u64)port->bufoffset + (i * sizeof(u32)),
 221                 saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
 222                 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
 223                 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
 224                 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
 225                 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
 226                 buf->idx);
 227
 228         return 0;
 229 }
 230
 231 int saa7164_buffer_cfg_port(struct saa7164_port *port)
 232 {
 233         tmHWStreamParameters_t *params = &port->hw_streamingparams;
 234         struct saa7164_dev *dev = port->dev;
 235         struct saa7164_buffer *buf;
 236         struct list_head *c, *n;
 237         int i = 0;
 238
 239         dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
 240
 241         saa7164_writel(port->bufcounter, 0);
 242         saa7164_writel(port->pitch, params->pitch);
 243         saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
 244
 245         dprintk(DBGLVL_BUF, " configured:\n");
 246         dprintk(DBGLVL_BUF, "   lmmio       0x%p\n", dev->lmmio);
 247         dprintk(DBGLVL_BUF, "   bufcounter  0x%x = 0x%x\n", port->bufcounter,
 248                 saa7164_readl(port->bufcounter));
 249
 250         dprintk(DBGLVL_BUF, "   pitch       0x%x = %d\n", port->pitch,
 251                 saa7164_readl(port->pitch));
 252
 253         dprintk(DBGLVL_BUF, "   bufsize     0x%x = %d\n", port->bufsize,
 254                 saa7164_readl(port->bufsize));
 255
 256         dprintk(DBGLVL_BUF, "   buffercount = %d\n", port->hwcfg.buffercount);
 257         dprintk(DBGLVL_BUF, "   bufoffset = 0x%x\n", port->bufoffset);
 258         dprintk(DBGLVL_BUF, "   bufptr32h = 0x%x\n", port->bufptr32h);
 259         dprintk(DBGLVL_BUF, "   bufptr32l = 0x%x\n", port->bufptr32l);
 260
 261         /* Poke the buffers and offsets into PCI space */
 262         mutex_lock(&port->dmaqueue_lock);
 263         list_for_each_safe(c, n, &port->dmaqueue.list) {
 264                 buf = list_entry(c, struct saa7164_buffer, list);
 265
 266                 if (buf->flags != SAA7164_BUFFER_FREE)
 267                         BUG();
 268
 269                 /* Place the buffer in the h/w queue */
 270                 saa7164_buffer_activate(buf, i);
 271
 272                 /* Don't exceed the device maximum # bufs */
 273                 if (i++ > port->hwcfg.buffercount)
 274                         BUG();
 275
 276         }
 277         mutex_unlock(&port->dmaqueue_lock);
 278
 279         return 0;
 280 }
 281
 282 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, u32 len)
 283 {
 284         struct saa7164_user_buffer *buf;
 285
 286         buf = kzalloc(sizeof(struct saa7164_user_buffer), GFP_KERNEL);
 287         if (buf == 0)
 288                 return 0;
 289
 290         buf->data = kzalloc(len, GFP_KERNEL);
 291
 292         if (buf->data == 0) {
 293                 kfree(buf);
 294                 return 0;
 295         }
 296
 297         buf->actual_size = len;
 298         buf->pos = 0;
 299
 300         dprintk(DBGLVL_BUF, "%s()   allocated user buffer @ 0x%p\n",
 301                 __func__, buf);
 302
 303         return buf;
 304 }
 305
 306 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
 307 {
 308         if (!buf)
 309                 return;
 310
 311         if (buf->data) {
 312                 kfree(buf->data);
 313                 buf->data = 0;
 314         }
 315
 316         if (buf)
 317                 kfree(buf);
 318 }
 319