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112 lines
3.4 KiB
112 lines
3.4 KiB
10 years ago
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From 1bd4d8a6de5cda605e8b99fbf081be2ea2959380 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Fri, 16 Jan 2015 17:11:29 +0100
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Subject: ARM: mvebu: use arm_coherent_dma_ops and re-enable hardware I/O
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coherency
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Now that we have enabled automatic I/O synchronization barriers, we no
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longer need any explicit barriers. We can therefore simplify
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arch/arm/mach-mvebu/coherency.c by using the existing
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arm_coherent_dma_ops instead of our custom mvebu_hwcc_dma_ops, and
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re-enable hardware I/O coherency support.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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[Andrew Lunn <andrew@lunn.ch>: Remove forgotten comment]
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Signed-off-by: Andrew Lunn <andrew@lunn.ch>
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--- a/arch/arm/mach-mvebu/coherency.c
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+++ b/arch/arm/mach-mvebu/coherency.c
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@@ -33,6 +33,7 @@
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#include <asm/smp_plat.h>
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#include <asm/cacheflush.h>
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#include <asm/mach/map.h>
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+#include <asm/dma-mapping.h>
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#include "armada-370-xp.h"
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#include "coherency.h"
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#include "mvebu-soc-id.h"
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@@ -223,59 +224,6 @@ static void __init armada_375_coherency_
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coherency_wa_enabled = true;
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}
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-static inline void mvebu_hwcc_sync_io_barrier(void)
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-{
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- if (coherency_wa_enabled) {
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- mvebu_hwcc_armada375_sync_io_barrier_wa();
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- return;
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- }
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-
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- writel(0x1, coherency_cpu_base + IO_SYNC_BARRIER_CTL_OFFSET);
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- while (readl(coherency_cpu_base + IO_SYNC_BARRIER_CTL_OFFSET) & 0x1);
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-}
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-
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-static dma_addr_t mvebu_hwcc_dma_map_page(struct device *dev, struct page *page,
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- unsigned long offset, size_t size,
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- enum dma_data_direction dir,
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- struct dma_attrs *attrs)
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-{
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- if (dir != DMA_TO_DEVICE)
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- mvebu_hwcc_sync_io_barrier();
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- return pfn_to_dma(dev, page_to_pfn(page)) + offset;
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-}
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-
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-
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-static void mvebu_hwcc_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
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- size_t size, enum dma_data_direction dir,
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- struct dma_attrs *attrs)
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-{
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- if (dir != DMA_TO_DEVICE)
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- mvebu_hwcc_sync_io_barrier();
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-}
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-
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-static void mvebu_hwcc_dma_sync(struct device *dev, dma_addr_t dma_handle,
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- size_t size, enum dma_data_direction dir)
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-{
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- if (dir != DMA_TO_DEVICE)
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- mvebu_hwcc_sync_io_barrier();
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-}
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-
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-static struct dma_map_ops mvebu_hwcc_dma_ops = {
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- .alloc = arm_dma_alloc,
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- .free = arm_dma_free,
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- .mmap = arm_dma_mmap,
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- .map_page = mvebu_hwcc_dma_map_page,
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- .unmap_page = mvebu_hwcc_dma_unmap_page,
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- .get_sgtable = arm_dma_get_sgtable,
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- .map_sg = arm_dma_map_sg,
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- .unmap_sg = arm_dma_unmap_sg,
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- .sync_single_for_cpu = mvebu_hwcc_dma_sync,
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- .sync_single_for_device = mvebu_hwcc_dma_sync,
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- .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
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- .sync_sg_for_device = arm_dma_sync_sg_for_device,
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- .set_dma_mask = arm_dma_set_mask,
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-};
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-
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static int mvebu_hwcc_notifier(struct notifier_block *nb,
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unsigned long event, void *__dev)
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{
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@@ -283,7 +231,7 @@ static int mvebu_hwcc_notifier(struct no
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if (event != BUS_NOTIFY_ADD_DEVICE)
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return NOTIFY_DONE;
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- set_dma_ops(dev, &mvebu_hwcc_dma_ops);
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+ set_dma_ops(dev, &arm_coherent_dma_ops);
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return NOTIFY_OK;
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}
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@@ -405,14 +353,9 @@ static int coherency_type(void)
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return type;
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}
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-/*
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- * As a precaution, we currently completely disable hardware I/O
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- * coherency, until enough testing is done with automatic I/O
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- * synchronization barriers to validate that it is a proper solution.
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- */
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int coherency_available(void)
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{
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- return false;
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+ return coherency_type() != COHERENCY_FABRIC_TYPE_NONE;
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}
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int __init coherency_init(void)
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