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(dev: &pci->dev, size: risc->size, cpu_addr: risc->cpu, dma_handle: 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(dev: &pci->dev, size, dma_handle: &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 | |