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 } 78