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(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, &memsize); 51 if (!memsize) 52 return 0; 53 54 buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL); 55 if (!buf) { 56 pr_warn("%s: unable to allocate memory\n", name); 57 return -ENOMEM; 58 } 59 60 memset(buf, 0, memsize); 61 62 r->flags = IORESOURCE_MEM; 63 r->start = dma_handle; 64 r->end = r->start + memsize - 1; 65 r->name = name; 66 return 0; 67 } 68