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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/kernel/dma-swiotlb.c
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@@ -1,119 +1,20 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Contains routines needed to support swiotlb for ppc.
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  *
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  * Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
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  * Author: Becky Bruce
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- *
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- * This program is free software; you can redistribute  it and/or modify it
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- * under  the terms of  the GNU General  Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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- *
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  */
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-
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-#include <linux/dma-mapping.h>
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 #include <linux/memblock.h>
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-#include <linux/pfn.h>
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-#include <linux/of_platform.h>
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-#include <linux/platform_device.h>
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-#include <linux/pci.h>
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-
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 #include <asm/machdep.h>
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 #include <asm/swiotlb.h>
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-#include <asm/dma.h>
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 unsigned int ppc_swiotlb_enable;
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-static u64 swiotlb_powerpc_get_required(struct device *dev)
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-{
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-	u64 end, mask, max_direct_dma_addr = dev->archdata.max_direct_dma_addr;
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-
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-	end = memblock_end_of_DRAM();
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-	if (max_direct_dma_addr && end > max_direct_dma_addr)
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-		end = max_direct_dma_addr;
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-	end += get_dma_offset(dev);
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-
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-	mask = 1ULL << (fls64(end) - 1);
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-	mask += mask - 1;
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-
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-	return mask;
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-}
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-
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-/*
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- * At the moment, all platforms that use this code only require
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- * swiotlb to be used if we're operating on HIGHMEM.  Since
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- * we don't ever call anything other than map_sg, unmap_sg,
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- * map_page, and unmap_page on highmem, use normal dma_ops
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- * for everything else.
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- */
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-const struct dma_map_ops powerpc_swiotlb_dma_ops = {
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-	.alloc = __dma_nommu_alloc_coherent,
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-	.free = __dma_nommu_free_coherent,
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-	.mmap = dma_nommu_mmap_coherent,
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-	.map_sg = swiotlb_map_sg_attrs,
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-	.unmap_sg = swiotlb_unmap_sg_attrs,
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-	.dma_supported = swiotlb_dma_supported,
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-	.map_page = swiotlb_map_page,
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-	.unmap_page = swiotlb_unmap_page,
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-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
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-	.sync_single_for_device = swiotlb_sync_single_for_device,
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-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
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-	.mapping_error = swiotlb_dma_mapping_error,
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-	.get_required_mask = swiotlb_powerpc_get_required,
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-};
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-
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-void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
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-{
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-	struct pci_controller *hose;
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-	struct dev_archdata *sd;
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-
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-	hose = pci_bus_to_host(pdev->bus);
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-	sd = &pdev->dev.archdata;
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-	sd->max_direct_dma_addr =
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-		hose->dma_window_base_cur + hose->dma_window_size;
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-}
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-
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-static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
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-				  unsigned long action, void *data)
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-{
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-	struct device *dev = data;
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-	struct dev_archdata *sd;
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-
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-	/* We are only intereted in device addition */
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-	if (action != BUS_NOTIFY_ADD_DEVICE)
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-		return 0;
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-
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-	sd = &dev->archdata;
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-	sd->max_direct_dma_addr = 0;
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-
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-	/* May need to bounce if the device can't address all of DRAM */
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-	if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
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-		set_dma_ops(dev, &powerpc_swiotlb_dma_ops);
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-
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-	return NOTIFY_DONE;
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-}
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-
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-static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
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-	.notifier_call = ppc_swiotlb_bus_notify,
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-	.priority = 0,
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-};
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-
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-int __init swiotlb_setup_bus_notifier(void)
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-{
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-	bus_register_notifier(&platform_bus_type,
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-			      &ppc_swiotlb_plat_bus_notifier);
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-	return 0;
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-}
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-
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 void __init swiotlb_detect_4g(void)
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 {
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-	if ((memblock_end_of_DRAM() - 1) > 0xffffffff) {
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+	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
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 		ppc_swiotlb_enable = 1;
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-#ifdef CONFIG_ZONE_DMA32
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-		limit_zone_pfn(ZONE_DMA32, (1ULL << 32) >> PAGE_SHIFT);
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-#endif
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-	}
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 }
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 static int __init check_swiotlb_enabled(void)