Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Paul Mundt | 8a7bcf0 | 2007-11-11 17:07:06 +0900 | [diff] [blame] | 2 | * Copyright (C) 2004 - 2007 Paul Mundt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Paul Mundt | 7b41f56 | 2009-04-14 15:22:15 +0900 | [diff] [blame] | 9 | #include <linux/init.h> |
Magnus Damm | 1eca5c9 | 2008-07-16 19:02:54 +0900 | [diff] [blame] | 10 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/dma-mapping.h> |
Paul Mundt | 7b41f56 | 2009-04-14 15:22:15 +0900 | [diff] [blame] | 12 | #include <linux/io.h> |
Magnus Damm | 1eca5c9 | 2008-07-16 19:02:54 +0900 | [diff] [blame] | 13 | |
Magnus Damm | 0c13bf1 | 2008-08-11 15:13:24 +0900 | [diff] [blame] | 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 | |
Magnus Damm | c773d8a | 2008-08-27 18:21:29 +0900 | [diff] [blame] | 20 | static void __init memchunk_cmdline_override(char *name, unsigned long *sizep) |
Magnus Damm | 0c13bf1 | 2008-08-11 15:13:24 +0900 | [diff] [blame] | 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(p, NULL); |
| 30 | pr_info("%s: forcing memory chunk size to 0x%08lx\n", |
| 31 | name, *sizep); |
| 32 | break; |
| 33 | } |
| 34 | } |
| 35 | } |
| 36 | |
Magnus Damm | c773d8a | 2008-08-27 18:21:29 +0900 | [diff] [blame] | 37 | int __init platform_resource_setup_memory(struct platform_device *pdev, |
| 38 | char *name, unsigned long memsize) |
Magnus Damm | 1eca5c9 | 2008-07-16 19:02:54 +0900 | [diff] [blame] | 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_warning("%s: unable to find empty space for resource\n", |
| 47 | name); |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | |
Magnus Damm | 0c13bf1 | 2008-08-11 15:13:24 +0900 | [diff] [blame] | 51 | memchunk_cmdline_override(name, &memsize); |
| 52 | if (!memsize) |
| 53 | return 0; |
| 54 | |
Jacopo Mondi | b9826a4 | 2018-04-18 11:42:35 +0200 | [diff] [blame] | 55 | buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL); |
Magnus Damm | 1eca5c9 | 2008-07-16 19:02:54 +0900 | [diff] [blame] | 56 | if (!buf) { |
| 57 | pr_warning("%s: unable to allocate memory\n", name); |
| 58 | return -ENOMEM; |
| 59 | } |
| 60 | |
| 61 | memset(buf, 0, memsize); |
| 62 | |
| 63 | r->flags = IORESOURCE_MEM; |
| 64 | r->start = dma_handle; |
| 65 | r->end = r->start + memsize - 1; |
| 66 | r->name = name; |
| 67 | return 0; |
| 68 | } |