174ba9207SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
290ca8befSHans Verkuil /*
390ca8befSHans Verkuil
490ca8befSHans Verkuil btcx-risc.c
590ca8befSHans Verkuil
690ca8befSHans Verkuil bt848/bt878/cx2388x risc code generator.
790ca8befSHans Verkuil
890ca8befSHans Verkuil (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
990ca8befSHans Verkuil
1090ca8befSHans Verkuil
1190ca8befSHans Verkuil */
1290ca8befSHans Verkuil
13fa132a64SMauro Carvalho Chehab #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14fa132a64SMauro Carvalho Chehab
1590ca8befSHans Verkuil #include <linux/module.h>
1690ca8befSHans Verkuil #include <linux/init.h>
1790ca8befSHans Verkuil #include <linux/pci.h>
1890ca8befSHans Verkuil #include <linux/interrupt.h>
1990ca8befSHans Verkuil #include <linux/videodev2.h>
20ca5999fdSMike Rapoport #include <linux/pgtable.h>
2165fddcfcSMike Rapoport #include <asm/page.h>
2290ca8befSHans Verkuil
2390ca8befSHans Verkuil #include "btcx-risc.h"
2490ca8befSHans Verkuil
2590ca8befSHans Verkuil static unsigned int btcx_debug;
2690ca8befSHans Verkuil module_param(btcx_debug, int, 0644);
2790ca8befSHans Verkuil MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");
2890ca8befSHans Verkuil
29fa132a64SMauro Carvalho Chehab #define dprintk(fmt, arg...) do { \
30fa132a64SMauro Carvalho Chehab if (btcx_debug) \
31fa132a64SMauro Carvalho Chehab printk(KERN_DEBUG pr_fmt("%s: " fmt), \
32fa132a64SMauro Carvalho Chehab __func__, ##arg); \
33fa132a64SMauro Carvalho Chehab } while (0)
34fa132a64SMauro Carvalho Chehab
35fa132a64SMauro Carvalho Chehab
3690ca8befSHans Verkuil /* ---------------------------------------------------------- */
3790ca8befSHans Verkuil /* allocate/free risc memory */
3890ca8befSHans Verkuil
3990ca8befSHans Verkuil static int memcnt;
4090ca8befSHans Verkuil
btcx_riscmem_free(struct pci_dev * pci,struct btcx_riscmem * risc)4190ca8befSHans Verkuil void btcx_riscmem_free(struct pci_dev *pci,
4290ca8befSHans Verkuil struct btcx_riscmem *risc)
4390ca8befSHans Verkuil {
4490ca8befSHans Verkuil if (NULL == risc->cpu)
4590ca8befSHans Verkuil return;
46fa132a64SMauro Carvalho Chehab
4790ca8befSHans Verkuil memcnt--;
48fa132a64SMauro Carvalho Chehab dprintk("btcx: riscmem free [%d] dma=%lx\n",
4990ca8befSHans Verkuil memcnt, (unsigned long)risc->dma);
50fa132a64SMauro Carvalho Chehab
51*b2a004d3SChristophe JAILLET dma_free_coherent(&pci->dev, risc->size, risc->cpu, risc->dma);
5290ca8befSHans Verkuil memset(risc,0,sizeof(*risc));
5390ca8befSHans Verkuil }
5490ca8befSHans Verkuil
btcx_riscmem_alloc(struct pci_dev * pci,struct btcx_riscmem * risc,unsigned int size)5590ca8befSHans Verkuil int btcx_riscmem_alloc(struct pci_dev *pci,
5690ca8befSHans Verkuil struct btcx_riscmem *risc,
5790ca8befSHans Verkuil unsigned int size)
5890ca8befSHans Verkuil {
5990ca8befSHans Verkuil __le32 *cpu;
6090ca8befSHans Verkuil dma_addr_t dma = 0;
6190ca8befSHans Verkuil
6290ca8befSHans Verkuil if (NULL != risc->cpu && risc->size < size)
6390ca8befSHans Verkuil btcx_riscmem_free(pci,risc);
6490ca8befSHans Verkuil if (NULL == risc->cpu) {
65*b2a004d3SChristophe JAILLET cpu = dma_alloc_coherent(&pci->dev, size, &dma, GFP_KERNEL);
6690ca8befSHans Verkuil if (NULL == cpu)
6790ca8befSHans Verkuil return -ENOMEM;
6890ca8befSHans Verkuil risc->cpu = cpu;
6990ca8befSHans Verkuil risc->dma = dma;
7090ca8befSHans Verkuil risc->size = size;
71fa132a64SMauro Carvalho Chehab
7290ca8befSHans Verkuil memcnt++;
73fa132a64SMauro Carvalho Chehab dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
7490ca8befSHans Verkuil memcnt, (unsigned long)dma, cpu, size);
7590ca8befSHans Verkuil }
7690ca8befSHans Verkuil return 0;
7790ca8befSHans Verkuil }
78