1 | /* |
2 | * Copyright (C) 2004 - 2007 Paul Mundt |
3 | * |
4 | * This file is subject to the terms and conditions of the GNU General Public |
5 | * License. See the file "COPYING" in the main directory of this archive |
6 | * for more details. |
7 | */ |
8 | #include <linux/mm.h> |
9 | #include <linux/init.h> |
10 | #include <linux/platform_device.h> |
11 | #include <linux/dma-mapping.h> |
12 | #include <linux/io.h> |
13 | |
14 | static int __init memchunk_setup(char *str) |
15 | { |
16 | return 1; /* accept anything that begins with "memchunk." */ |
17 | } |
18 | __setup("memchunk." , memchunk_setup); |
19 | |
20 | static void __init memchunk_cmdline_override(char *name, unsigned long *sizep) |
21 | { |
22 | char *p = boot_command_line; |
23 | int k = strlen(name); |
24 | |
25 | while ((p = strstr(p, "memchunk." ))) { |
26 | p += 9; /* strlen("memchunk.") */ |
27 | if (!strncmp(name, p, k) && p[k] == '=') { |
28 | p += k + 1; |
29 | *sizep = memparse(ptr: p, NULL); |
30 | pr_info("%s: forcing memory chunk size to 0x%08lx\n" , |
31 | name, *sizep); |
32 | break; |
33 | } |
34 | } |
35 | } |
36 | |
37 | int __init platform_resource_setup_memory(struct platform_device *pdev, |
38 | char *name, unsigned long memsize) |
39 | { |
40 | struct resource *r; |
41 | dma_addr_t dma_handle; |
42 | void *buf; |
43 | |
44 | r = pdev->resource + pdev->num_resources - 1; |
45 | if (r->flags) { |
46 | pr_warn("%s: unable to find empty space for resource\n" , name); |
47 | return -EINVAL; |
48 | } |
49 | |
50 | memchunk_cmdline_override(name, sizep: &memsize); |
51 | if (!memsize) |
52 | return 0; |
53 | |
54 | buf = dma_alloc_coherent(dev: &pdev->dev, size: memsize, dma_handle: &dma_handle, GFP_KERNEL); |
55 | if (!buf) { |
56 | pr_warn("%s: unable to allocate memory\n" , name); |
57 | return -ENOMEM; |
58 | } |
59 | |
60 | r->flags = IORESOURCE_MEM; |
61 | r->start = dma_handle; |
62 | r->end = r->start + memsize - 1; |
63 | r->name = name; |
64 | return 0; |
65 | } |
66 | |