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