35 lines
910 B
C
35 lines
910 B
C
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// SPDX-License-Identifier: GPL-2.0
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/etherdevice.h>
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#include <linux/of_address.h>
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#include <asm/prom.h>
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void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window,
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unsigned long *busno, unsigned long *phys,
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unsigned long *size)
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{
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u32 cells;
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const __be32 *prop;
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/* busno is always one cell */
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*busno = of_read_number(dma_window, 1);
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dma_window++;
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prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
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if (!prop)
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prop = of_get_property(dn, "#address-cells", NULL);
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cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn);
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*phys = of_read_number(dma_window, cells);
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dma_window += cells;
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prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
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cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn);
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*size = of_read_number(dma_window, cells);
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}
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