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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 4 btcx-risc.c5 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 ": " fmt14 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 25static unsigned int btcx_debug;26module_param(btcx_debug, int, 0644);27MODULE_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 39static int memcnt;40 41void 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 55int 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}78