LXR linux/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
  69void 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 */
  92struct 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
 155fail2:
 156        pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
 157fail1:
 158        kfree(buf);
 159
 160        buf = NULL;
 161ret:
 162        return buf;
 163}
 164
 165int 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
 187int 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 */
 202int 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
 235int 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
 286struct 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
 312void 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
 323