drivers/media/pci/bt8xx/btcx-risc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3
   4     btcx-risc.c
   5
   6     bt848/bt878/cx2388x risc code generator.
   7
   8     (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   9
  10
  11 */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/pci.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/pgtable.h>
  21 #include <asm/page.h>
  22
  23 #include "btcx-risc.h"
  24
  25 static unsigned int btcx_debug;
  26 module_param(btcx_debug, int, 0644);
  27 MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");
  28
  29 #define dprintk(fmt, arg...) do {                               \
  30         if (btcx_debug)                                         \
  31                 printk(KERN_DEBUG pr_fmt("%s: " fmt),           \
  32                        __func__, ##arg);                        \
  33 } while (0)
  34
  35
  36 /* ---------------------------------------------------------- */
  37 /* allocate/free risc memory                                  */
  38
  39 static int memcnt;
  40
  41 void btcx_riscmem_free(struct pci_dev *pci,
  42                        struct btcx_riscmem *risc)
  43 {
  44         if (NULL == risc->cpu)
  45                 return;
  46
  47         memcnt--;
  48         dprintk("btcx: riscmem free [%d] dma=%lx\n",
  49                 memcnt, (unsigned long)risc->dma);
  50
  51         dma_free_coherent(&pci->dev, risc->size, risc->cpu, risc->dma);
  52         memset(risc,0,sizeof(*risc));
  53 }
  54
  55 int btcx_riscmem_alloc(struct pci_dev *pci,
  56                        struct btcx_riscmem *risc,
  57                        unsigned int size)
  58 {
  59         __le32 *cpu;
  60         dma_addr_t dma = 0;
  61
  62         if (NULL != risc->cpu && risc->size < size)
  63                 btcx_riscmem_free(pci,risc);
  64         if (NULL == risc->cpu) {
  65                 cpu = dma_alloc_coherent(&pci->dev, size, &dma, GFP_KERNEL);
  66                 if (NULL == cpu)
  67                         return -ENOMEM;
  68                 risc->cpu  = cpu;
  69                 risc->dma  = dma;
  70                 risc->size = size;
  71
  72                 memcnt++;
  73                 dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
  74                         memcnt, (unsigned long)dma, cpu, size);
  75         }
  76         return 0;
  77 }