2202d81b09
Function dma_alloc_coherent use in buf already zeroes out memory, so memset is not needed. Signed-off-by: Chen Zhou <chenzhou10@huawei.com> Signed-off-by: Rich Felker <dalias@libc.org>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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* Copyright (C) 2004 - 2007 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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static int __init memchunk_setup(char *str)
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{
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return 1; /* accept anything that begins with "memchunk." */
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}
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__setup("memchunk.", memchunk_setup);
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static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
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{
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char *p = boot_command_line;
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int k = strlen(name);
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while ((p = strstr(p, "memchunk."))) {
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p += 9; /* strlen("memchunk.") */
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if (!strncmp(name, p, k) && p[k] == '=') {
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p += k + 1;
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*sizep = memparse(p, NULL);
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pr_info("%s: forcing memory chunk size to 0x%08lx\n",
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name, *sizep);
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break;
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}
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}
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}
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int __init platform_resource_setup_memory(struct platform_device *pdev,
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char *name, unsigned long memsize)
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{
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struct resource *r;
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dma_addr_t dma_handle;
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void *buf;
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r = pdev->resource + pdev->num_resources - 1;
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if (r->flags) {
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pr_warn("%s: unable to find empty space for resource\n", name);
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return -EINVAL;
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}
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memchunk_cmdline_override(name, &memsize);
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if (!memsize)
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return 0;
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buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL);
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if (!buf) {
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pr_warn("%s: unable to allocate memory\n", name);
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return -ENOMEM;
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}
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r->flags = IORESOURCE_MEM;
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r->start = dma_handle;
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r->end = r->start + memsize - 1;
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r->name = name;
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return 0;
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}
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