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
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