2d026a316a
DMA and CPU address view is different, we need to convert them:
+--------+ +--------+ +---------+ +--------+
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| CPUs | | DEV0 | | IOMMU <----+ | DEV1 |
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+----+---+ +----+---+ +----+----+ | +----+---+
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0x200000 | 0x1000 | 0x1000 | | 0x8000 |
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+-------------+-----------+ +----------+
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+--------v----------------------------------------------------+
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| Address BUS |
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+-------------------------------------------------------------+
Signed-off-by: GuEe-GUI <2991707448@qq.com>
55 lines
1.8 KiB
C
Executable File
55 lines
1.8 KiB
C
Executable File
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-08-25 GuEe-GUI first version
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*/
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#ifndef __OFW_IO_H__
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#define __OFW_IO_H__
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#include <ioremap.h>
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#include <drivers/ofw.h>
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int rt_ofw_bus_addr_cells(struct rt_ofw_node *np);
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int rt_ofw_bus_size_cells(struct rt_ofw_node *np);
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int rt_ofw_io_addr_cells(struct rt_ofw_node *np);
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int rt_ofw_io_size_cells(struct rt_ofw_node *np);
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int rt_ofw_get_address_count(struct rt_ofw_node *np);
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rt_err_t rt_ofw_get_address(struct rt_ofw_node *np, int index, rt_uint64_t *out_address, rt_uint64_t *out_size);
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rt_err_t rt_ofw_get_address_by_name(struct rt_ofw_node *np, const char *name,
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rt_uint64_t *out_address, rt_uint64_t *out_size);
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int rt_ofw_get_address_array(struct rt_ofw_node *np, int nr, rt_uint64_t *out_regs);
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rt_uint64_t rt_ofw_translate_address(struct rt_ofw_node *np, const char *range_type, rt_uint64_t address);
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rt_uint64_t rt_ofw_reverse_address(struct rt_ofw_node *np, const char *range_type, rt_uint64_t address);
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rt_inline rt_uint64_t rt_ofw_translate_dma2cpu(struct rt_ofw_node *np, rt_uint64_t address)
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{
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rt_uint64_t bus_addr, cpu_addr;
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bus_addr = rt_ofw_reverse_address(np, "dma-ranges", address);
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cpu_addr = rt_ofw_translate_address(np, "ranges", bus_addr);
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return cpu_addr != ~0ULL ? cpu_addr : address;
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}
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rt_inline rt_uint64_t rt_ofw_translate_cpu2dma(struct rt_ofw_node *np, rt_uint64_t address)
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{
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rt_uint64_t bus_addr, dma_addr;
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bus_addr = rt_ofw_reverse_address(np, "ranges", address);
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dma_addr = rt_ofw_translate_address(np, "dma-ranges", bus_addr);
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return dma_addr != ~0ULL ? dma_addr : address;
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}
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void *rt_ofw_iomap(struct rt_ofw_node *np, int index);
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void *rt_ofw_iomap_by_name(struct rt_ofw_node *np, const char *name);
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#endif /* __OFW_IO_H__ */
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