1 files changed, 8 insertions, 105 deletions

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index bd1a2aba599f..ba256c37bcc0 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -1,127 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Contains routines needed to support swiotlb for ppc.
  *
  * Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
  * Author: Becky Bruce
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- *
  */
-
-#include <linux/dma-mapping.h>
 #include <linux/memblock.h>
-#include <linux/pfn.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/pci.h>
-
 #include <asm/machdep.h>
 #include <asm/swiotlb.h>
-#include <asm/dma.h>
 
 unsigned int ppc_swiotlb_enable;
+unsigned int ppc_swiotlb_flags;
 
-static u64 swiotlb_powerpc_get_required(struct device *dev)
-{
-	u64 end, mask, max_direct_dma_addr = dev->archdata.max_direct_dma_addr;
-
-	end = memblock_end_of_DRAM();
-	if (max_direct_dma_addr && end > max_direct_dma_addr)
-		end = max_direct_dma_addr;
-	end += get_dma_offset(dev);
-
-	mask = 1ULL << (fls64(end) - 1);
-	mask += mask - 1;
-
-	return mask;
-}
-
-/*
- * At the moment, all platforms that use this code only require
- * swiotlb to be used if we're operating on HIGHMEM.  Since
- * we don't ever call anything other than map_sg, unmap_sg,
- * map_page, and unmap_page on highmem, use normal dma_ops
- * for everything else.
- */
-struct dma_map_ops swiotlb_dma_ops = {
-	.alloc = dma_direct_alloc_coherent,
-	.free = dma_direct_free_coherent,
-	.mmap = dma_direct_mmap_coherent,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.dma_supported = swiotlb_dma_supported,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.mapping_error = swiotlb_dma_mapping_error,
-	.get_required_mask = swiotlb_powerpc_get_required,
-};
-
-void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
-{
-	struct pci_controller *hose;
-	struct dev_archdata *sd;
-
-	hose = pci_bus_to_host(pdev->bus);
-	sd = &pdev->dev.archdata;
-	sd->max_direct_dma_addr =
-		hose->dma_window_base_cur + hose->dma_window_size;
-}
-
-static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
-				  unsigned long action, void *data)
-{
-	struct device *dev = data;
-	struct dev_archdata *sd;
-
-	/* We are only intereted in device addition */
-	if (action != BUS_NOTIFY_ADD_DEVICE)
-		return 0;
-
-	sd = &dev->archdata;
-	sd->max_direct_dma_addr = 0;
-
-	/* May need to bounce if the device can't address all of DRAM */
-	if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
-		set_dma_ops(dev, &swiotlb_dma_ops);
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
-	.notifier_call = ppc_swiotlb_bus_notify,
-	.priority = 0,
-};
-
-int __init swiotlb_setup_bus_notifier(void)
-{
-	bus_register_notifier(&platform_bus_type,
-			      &ppc_swiotlb_plat_bus_notifier);
-	return 0;
-}
-
-void swiotlb_detect_4g(void)
+void __init swiotlb_detect_4g(void)
 {
 	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
 		ppc_swiotlb_enable = 1;
 }
 
-static int __init swiotlb_late_init(void)
+static int __init check_swiotlb_enabled(void)
 {
-	if (ppc_swiotlb_enable) {
+	if (ppc_swiotlb_enable)
 		swiotlb_print_info();
-		set_pci_dma_ops(&swiotlb_dma_ops);
-		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
-	} else {
-		swiotlb_free();
-	}
+	else
+		swiotlb_exit();
 
 	return 0;
 }
-subsys_initcall(swiotlb_late_init);
+subsys_initcall(check_swiotlb_enabled);