58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/acpi.h>
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#include <linux/dma-direct.h>
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#include <asm/loongson.h>
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/*
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* We extract 4bit node id (bit 44~47) from Loongson-3's
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* 48bit physical address space and embed it into 40bit.
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*/
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static int node_id_offset;
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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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long nid = (paddr >> 44) & 0xf;
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return ((nid << 44) ^ paddr) | (nid << node_id_offset);
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}
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phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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long nid = (daddr >> node_id_offset) & 0xf;
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return ((nid << node_id_offset) ^ daddr) | (nid << 44);
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}
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void acpi_arch_dma_setup(struct device *dev)
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{
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int ret;
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u64 mask, end = 0;
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const struct bus_dma_region *map = NULL;
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if (node_id_offset == 0) {
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node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF);
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node_id_offset += 36;
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}
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ret = acpi_dma_get_range(dev, &map);
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if (!ret && map) {
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const struct bus_dma_region *r = map;
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for (end = 0; r->size; r++) {
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if (r->dma_start + r->size - 1 > end)
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end = r->dma_start + r->size - 1;
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}
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mask = DMA_BIT_MASK(ilog2(end) + 1);
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dev->bus_dma_limit = end;
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dev->dma_range_map = map;
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dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
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*dev->dma_mask = min(*dev->dma_mask, mask);
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}
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}
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