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

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2010-2015 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
  18 #include <linux/slab.h>
  19
  20 #include "saa7164.h"
  21
  22 /* The PCI address space for buffer handling looks like this:
  23  *
  24  * +-u32 wide-------------+
  25  * |                      +
  26  * +-u64 wide------------------------------------+
  27  * +                                             +
  28  * +----------------------+
  29  * | CurrentBufferPtr     + Pointer to current PCI buffer >-+
  30  * +----------------------+                                 |
  31  * | Unused               +                                 |
  32  * +----------------------+                                 |
  33  * | Pitch                + = 188 (bytes)                   |
  34  * +----------------------+                                 |
  35  * | PCI buffer size      + = pitch * number of lines (312) |
  36  * +----------------------+                                 |
  37  * |0| Buf0 Write Offset  +                                 |
  38  * +----------------------+                                 v
  39  * |1| Buf1 Write Offset  +                                 |
  40  * +----------------------+                                 |
  41  * |2| Buf2 Write Offset  +                                 |
  42  * +----------------------+                                 |
  43  * |3| Buf3 Write Offset  +                                 |
  44  * +----------------------+                                 |
  45  * ... More write offsets                                   |
  46  * +---------------------------------------------+          |
  47  * +0| set of ptrs to PCI pagetables             +          |
  48  * +---------------------------------------------+          |
  49  * +1| set of ptrs to PCI pagetables             + <--------+
  50  * +---------------------------------------------+
  51  * +2| set of ptrs to PCI pagetables             +
  52  * +---------------------------------------------+
  53  * +3| set of ptrs to PCI pagetables             + >--+
  54  * +---------------------------------------------+    |
  55  * ... More buffer pointers                           |  +----------------+
  56  *                                                  +->| pt[0] TS data  |
  57  *                                                  |  +----------------+
  58  *                                                  |
  59  *                                                  |  +----------------+
  60  *                                                  +->| pt[1] TS data  |
  61  *                                                  |  +----------------+
  62  *                                                  | etc
  63  */
  64
  65 void saa7164_buffer_display(struct saa7164_buffer *buf)
  66 {
  67         struct saa7164_dev *dev = buf->port->dev;
  68         int i;
  69
  70         dprintk(DBGLVL_BUF, "%s()   buffer @ 0x%p nr=%d\n",
  71                 __func__, buf, buf->idx);
  72         dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08llx len = 0x%x\n",
  73                 buf->cpu, (long long)buf->dma, buf->pci_size);
  74         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
  75                 buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
  76
  77         /* Format the Page Table Entries to point into the data buffer */
  78         for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
  79
  80                 dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
  81                         i, buf->pt_cpu, (u64)*(buf->pt_cpu));
  82
  83         }
  84 }
  85 /* Allocate a new buffer structure and associated PCI space in bytes.
  86  * len must be a multiple of sizeof(u64)
  87  */
  88 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
  89         u32 len)
  90 {
  91         struct tmHWStreamParameters *params = &port->hw_streamingparams;
  92         struct saa7164_buffer *buf = NULL;
  93         struct saa7164_dev *dev = port->dev;
  94         int i;
  95
  96         if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
  97                 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
  98                 goto ret;
  99         }
 100
 101         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 102         if (!buf)
 103                 goto ret;
 104
 105         buf->idx = -1;
 106         buf->port = port;
 107         buf->flags = SAA7164_BUFFER_FREE;
 108         buf->pos = 0;
 109         buf->actual_size = params->pitch * params->numberoflines;
 110         buf->crc = 0;
 111         /* TODO: arg len is being ignored */
 112         buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
 113         buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
 114
 115         /* Allocate contiguous memory */
 116         buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
 117                 &buf->dma);
 118         if (!buf->cpu)
 119                 goto fail1;
 120
 121         buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
 122                 &buf->pt_dma);
 123         if (!buf->pt_cpu)
 124                 goto fail2;
 125
 126         /* init the buffers to a known pattern, easier during debugging */
 127         memset(buf->cpu, 0xff, buf->pci_size);
 128         buf->crc = crc32(0, buf->cpu, buf->actual_size);
 129         memset(buf->pt_cpu, 0xff, buf->pt_size);
 130
 131         dprintk(DBGLVL_BUF, "%s()   allocated buffer @ 0x%p (%d pageptrs)\n",
 132                 __func__, buf, params->numpagetables);
 133         dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08lx len = 0x%x\n",
 134                 buf->cpu, (long)buf->dma, buf->pci_size);
 135         dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
 136                 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
 137
 138         /* Format the Page Table Entries to point into the data buffer */
 139         for (i = 0 ; i < params->numpagetables; i++) {
 140
 141                 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
 142                 dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
 143                         i, buf->pt_cpu, (u64)*(buf->pt_cpu));
 144
 145         }
 146
 147         goto ret;
 148
 149 fail2:
 150         pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
 151 fail1:
 152         kfree(buf);
 153
 154         buf = NULL;
 155 ret:
 156         return buf;
 157 }
 158
 159 int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
 160 {
 161         struct saa7164_dev *dev;
 162
 163         if (!buf || !buf->port)
 164                 return SAA_ERR_BAD_PARAMETER;
 165         dev = buf->port->dev;
 166
 167         dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
 168                 __func__, buf);
 169
 170         if (buf->flags != SAA7164_BUFFER_FREE)
 171                 log_warn(" freeing a non-free buffer\n");
 172
 173         pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
 174         pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
 175
 176         kfree(buf);
 177
 178         return SAA_OK;
 179 }
 180
 181 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
 182 {
 183         struct saa7164_dev *dev = port->dev;
 184
 185         if ((i < 0) || (i >= port->hwcfg.buffercount))
 186                 return -EINVAL;
 187
 188         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 189
 190         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 191
 192         return 0;
 193 }
 194
 195 /* Write a buffer into the hardware */
 196 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
 197 {
 198         struct saa7164_port *port = buf->port;
 199         struct saa7164_dev *dev = port->dev;
 200
 201         if ((i < 0) || (i >= port->hwcfg.buffercount))
 202                 return -EINVAL;
 203
 204         dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
 205
 206         buf->idx = i; /* Note of which buffer list index position we occupy */
 207         buf->flags = SAA7164_BUFFER_BUSY;
 208         buf->pos = 0;
 209
 210         /* TODO: Review this in light of 32v64 assignments */
 211         saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
 212         saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
 213         saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
 214
 215         dprintk(DBGLVL_BUF, "   buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
 216                 buf->idx,
 217                 (u64)port->bufoffset + (i * sizeof(u32)),
 218                 saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
 219                 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
 220                 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
 221                 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
 222                 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
 223                 buf->idx);
 224
 225         return 0;
 226 }
 227
 228 int saa7164_buffer_cfg_port(struct saa7164_port *port)
 229 {
 230         struct tmHWStreamParameters *params = &port->hw_streamingparams;
 231         struct saa7164_dev *dev = port->dev;
 232         struct saa7164_buffer *buf;
 233         struct list_head *c, *n;
 234         int i = 0;
 235
 236         dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
 237
 238         saa7164_writel(port->bufcounter, 0);
 239         saa7164_writel(port->pitch, params->pitch);
 240         saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
 241
 242         dprintk(DBGLVL_BUF, " configured:\n");
 243         dprintk(DBGLVL_BUF, "   lmmio       0x%p\n", dev->lmmio);
 244         dprintk(DBGLVL_BUF, "   bufcounter  0x%x = 0x%x\n", port->bufcounter,
 245                 saa7164_readl(port->bufcounter));
 246
 247         dprintk(DBGLVL_BUF, "   pitch       0x%x = %d\n", port->pitch,
 248                 saa7164_readl(port->pitch));
 249
 250         dprintk(DBGLVL_BUF, "   bufsize     0x%x = %d\n", port->bufsize,
 251                 saa7164_readl(port->bufsize));
 252
 253         dprintk(DBGLVL_BUF, "   buffercount = %d\n", port->hwcfg.buffercount);
 254         dprintk(DBGLVL_BUF, "   bufoffset = 0x%x\n", port->bufoffset);
 255         dprintk(DBGLVL_BUF, "   bufptr32h = 0x%x\n", port->bufptr32h);
 256         dprintk(DBGLVL_BUF, "   bufptr32l = 0x%x\n", port->bufptr32l);
 257
 258         /* Poke the buffers and offsets into PCI space */
 259         mutex_lock(&port->dmaqueue_lock);
 260         list_for_each_safe(c, n, &port->dmaqueue.list) {
 261                 buf = list_entry(c, struct saa7164_buffer, list);
 262
 263                 if (buf->flags != SAA7164_BUFFER_FREE)
 264                         BUG();
 265
 266                 /* Place the buffer in the h/w queue */
 267                 saa7164_buffer_activate(buf, i);
 268
 269                 /* Don't exceed the device maximum # bufs */
 270                 if (i++ > port->hwcfg.buffercount)
 271                         BUG();
 272
 273         }
 274         mutex_unlock(&port->dmaqueue_lock);
 275
 276         return 0;
 277 }
 278
 279 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
 280         u32 len)
 281 {
 282         struct saa7164_user_buffer *buf;
 283
 284         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 285         if (!buf)
 286                 return NULL;
 287
 288         buf->data = kzalloc(len, GFP_KERNEL);
 289
 290         if (!buf->data) {
 291                 kfree(buf);
 292                 return NULL;
 293         }
 294
 295         buf->actual_size = len;
 296         buf->pos = 0;
 297         buf->crc = 0;
 298
 299         dprintk(DBGLVL_BUF, "%s()   allocated user buffer @ 0x%p\n",
 300                 __func__, buf);
 301
 302         return buf;
 303 }
 304
 305 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
 306 {
 307         if (!buf)
 308                 return;
 309
 310         kfree(buf->data);
 311         buf->data = NULL;
 312
 313         kfree(buf);
 314 }
 315