78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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btcx-risc.c
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bt848/bt878/cx2388x risc code generator.
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(c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/videodev2.h>
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#include <linux/pgtable.h>
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#include <asm/page.h>
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#include "btcx-risc.h"
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static unsigned int btcx_debug;
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module_param(btcx_debug, int, 0644);
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MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");
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#define dprintk(fmt, arg...) do { \
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if (btcx_debug) \
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printk(KERN_DEBUG pr_fmt("%s: " fmt), \
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__func__, ##arg); \
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} while (0)
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/* ---------------------------------------------------------- */
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/* allocate/free risc memory */
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static int memcnt;
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void btcx_riscmem_free(struct pci_dev *pci,
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struct btcx_riscmem *risc)
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{
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if (NULL == risc->cpu)
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return;
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memcnt--;
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dprintk("btcx: riscmem free [%d] dma=%lx\n",
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memcnt, (unsigned long)risc->dma);
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dma_free_coherent(&pci->dev, risc->size, risc->cpu, risc->dma);
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memset(risc,0,sizeof(*risc));
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}
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int btcx_riscmem_alloc(struct pci_dev *pci,
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struct btcx_riscmem *risc,
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unsigned int size)
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{
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__le32 *cpu;
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dma_addr_t dma = 0;
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if (NULL != risc->cpu && risc->size < size)
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btcx_riscmem_free(pci,risc);
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if (NULL == risc->cpu) {
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cpu = dma_alloc_coherent(&pci->dev, size, &dma, GFP_KERNEL);
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if (NULL == cpu)
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return -ENOMEM;
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risc->cpu = cpu;
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risc->dma = dma;
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risc->size = size;
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memcnt++;
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dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
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memcnt, (unsigned long)dma, cpu, size);
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}
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return 0;
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}
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