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37 lines
949 B
37 lines
949 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2006 Ralf Baechle <[email protected]> |
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*/ |
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#include <linux/dma-direct.h> |
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#include <asm/ip32/crime.h> |
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/* |
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* Few notes. |
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* 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M |
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* 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for |
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* native-endian) |
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* 3. All other devices see memory as one big chunk at 0x40000000 |
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* 4. Non-PCI devices will pass NULL as struct device* |
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* |
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* Thus we translate differently, depending on device. |
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*/ |
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#define RAM_OFFSET_MASK 0x3fffffffUL |
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dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
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{ |
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dma_addr_t dma_addr = paddr & RAM_OFFSET_MASK; |
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if (!dev) |
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dma_addr += CRIME_HI_MEM_BASE; |
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return dma_addr; |
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} |
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phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr) |
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{ |
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phys_addr_t paddr = dma_addr & RAM_OFFSET_MASK; |
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if (dma_addr >= 256*1024*1024) |
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paddr += CRIME_HI_MEM_BASE; |
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return paddr; |
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}
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