diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.18/025-ARM-mvebu-Use-arm_coherent_dma_ops.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.18/025-ARM-mvebu-Use-arm_coherent_dma_ops.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.18/025-ARM-mvebu-Use-arm_coherent_dma_ops.patch b/target/linux/mvebu/patches-3.18/025-ARM-mvebu-Use-arm_coherent_dma_ops.patch new file mode 100644 index 0000000..e3d1415 --- /dev/null +++ b/target/linux/mvebu/patches-3.18/025-ARM-mvebu-Use-arm_coherent_dma_ops.patch @@ -0,0 +1,111 @@ +From 1bd4d8a6de5cda605e8b99fbf081be2ea2959380 Mon Sep 17 00:00:00 2001 +From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Date: Fri, 16 Jan 2015 17:11:29 +0100 +Subject: ARM: mvebu: use arm_coherent_dma_ops and re-enable hardware I/O + coherency + +Now that we have enabled automatic I/O synchronization barriers, we no +longer need any explicit barriers. We can therefore simplify +arch/arm/mach-mvebu/coherency.c by using the existing +arm_coherent_dma_ops instead of our custom mvebu_hwcc_dma_ops, and +re-enable hardware I/O coherency support. + +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +[Andrew Lunn <andrew@lunn.ch>: Remove forgotten comment] +Signed-off-by: Andrew Lunn <andrew@lunn.ch> + +--- a/arch/arm/mach-mvebu/coherency.c ++++ b/arch/arm/mach-mvebu/coherency.c +@@ -33,6 +33,7 @@ + #include <asm/smp_plat.h> + #include <asm/cacheflush.h> + #include <asm/mach/map.h> ++#include <asm/dma-mapping.h> + #include "armada-370-xp.h" + #include "coherency.h" + #include "mvebu-soc-id.h" +@@ -223,59 +224,6 @@ static void __init armada_375_coherency_ + coherency_wa_enabled = true; + } + +-static inline void mvebu_hwcc_sync_io_barrier(void) +-{ +- if (coherency_wa_enabled) { +- mvebu_hwcc_armada375_sync_io_barrier_wa(); +- return; +- } +- +- writel(0x1, coherency_cpu_base + IO_SYNC_BARRIER_CTL_OFFSET); +- while (readl(coherency_cpu_base + IO_SYNC_BARRIER_CTL_OFFSET) & 0x1); +-} +- +-static dma_addr_t mvebu_hwcc_dma_map_page(struct device *dev, struct page *page, +- unsigned long offset, size_t size, +- enum dma_data_direction dir, +- struct dma_attrs *attrs) +-{ +- if (dir != DMA_TO_DEVICE) +- mvebu_hwcc_sync_io_barrier(); +- return pfn_to_dma(dev, page_to_pfn(page)) + offset; +-} +- +- +-static void mvebu_hwcc_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, +- size_t size, enum dma_data_direction dir, +- struct dma_attrs *attrs) +-{ +- if (dir != DMA_TO_DEVICE) +- mvebu_hwcc_sync_io_barrier(); +-} +- +-static void mvebu_hwcc_dma_sync(struct device *dev, dma_addr_t dma_handle, +- size_t size, enum dma_data_direction dir) +-{ +- if (dir != DMA_TO_DEVICE) +- mvebu_hwcc_sync_io_barrier(); +-} +- +-static struct dma_map_ops mvebu_hwcc_dma_ops = { +- .alloc = arm_dma_alloc, +- .free = arm_dma_free, +- .mmap = arm_dma_mmap, +- .map_page = mvebu_hwcc_dma_map_page, +- .unmap_page = mvebu_hwcc_dma_unmap_page, +- .get_sgtable = arm_dma_get_sgtable, +- .map_sg = arm_dma_map_sg, +- .unmap_sg = arm_dma_unmap_sg, +- .sync_single_for_cpu = mvebu_hwcc_dma_sync, +- .sync_single_for_device = mvebu_hwcc_dma_sync, +- .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu, +- .sync_sg_for_device = arm_dma_sync_sg_for_device, +- .set_dma_mask = arm_dma_set_mask, +-}; +- + static int mvebu_hwcc_notifier(struct notifier_block *nb, + unsigned long event, void *__dev) + { +@@ -283,7 +231,7 @@ static int mvebu_hwcc_notifier(struct no + + if (event != BUS_NOTIFY_ADD_DEVICE) + return NOTIFY_DONE; +- set_dma_ops(dev, &mvebu_hwcc_dma_ops); ++ set_dma_ops(dev, &arm_coherent_dma_ops); + + return NOTIFY_OK; + } +@@ -405,14 +353,9 @@ static int coherency_type(void) + return type; + } + +-/* +- * As a precaution, we currently completely disable hardware I/O +- * coherency, until enough testing is done with automatic I/O +- * synchronization barriers to validate that it is a proper solution. +- */ + int coherency_available(void) + { +- return false; ++ return coherency_type() != COHERENCY_FABRIC_TYPE_NONE; + } + + int __init coherency_init(void) |