From: Dan Williams [EMAIL PROTECTED]
This is a driver for the iop DMA/AAU/ADMA units which are capable of pq_xor,
pq_update, pq_zero_sum, xor, dual_xor, xor_zero_sum, fill, copy+crc, and copy
operations.
Changelog:
* fixed a slot allocation bug in do_iop13xx_adma_xor that caused too few
slots to be requested eventually leading to data corruption
* enabled the slot allocation routine to attempt to free slots before
returning -ENOMEM
* switched the cleanup routine to solely use the software chain and the
status register to determine if a descriptor is complete. This is
necessary to support other IOP engines that do not have status writeback
capability
* make the driver iop generic
* modified the allocation routines to understand allocating a group of
slots for a single operation
* added a null xor initialization operation for the xor only channel on
iop3xx
* add software emulation of zero sum on iop32x
* support xor operations on buffers larger than the hardware maximum
* add architecture specific raid5-dma support functions
Signed-off-by: Dan Williams [EMAIL PROTECTED]
---
drivers/dma/Kconfig | 27 +
drivers/dma/Makefile|1
drivers/dma/iop-adma.c | 1501 +++
include/asm-arm/hardware/iop_adma.h | 98 ++
4 files changed, 1624 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index fced8c3..3556143 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -7,8 +7,8 @@ menu DMA Engine support
config DMA_ENGINE
bool Support for DMA engines
---help---
- DMA engines offload copy operations from the CPU to dedicated
- hardware, allowing the copies to happen asynchronously.
+ DMA engines offload block memory operations from the CPU to dedicated
+ hardware, allowing the operations to happen asynchronously.
comment DMA Clients
@@ -28,9 +28,19 @@ config RAID5_DMA
default y
---help---
This enables the use of DMA engines in the MD-RAID5 driver to
- offload stripe cache operations, freeing CPU cycles.
+ offload stripe cache operations (i.e. xor, memcpy), freeing CPU
cycles.
say Y here
+config RAID5_DMA_WAIT_VIA_REQUEUE
+ bool raid5-dma: Non-blocking channel switching
+ depends on RAID5_DMA_ARCH_NEEDS_CHAN_SWITCH RAID5_DMA BROKEN
+ default n
+ ---help---
+ This enables the raid5-dma driver to continue to operate on incoming
+ stripes when it determines that the current stripe must wait for a
+ a hardware channel to finish operations. This code is a work in
+ progress, only say Y to debug the implementation, otherwise say N.
+
comment DMA Devices
config INTEL_IOATDMA
@@ -40,4 +50,15 @@ config INTEL_IOATDMA
---help---
Enable support for the Intel(R) I/OAT DMA engine.
+config INTEL_IOP_ADMA
+tristate Intel IOP ADMA support
+depends on DMA_ENGINE (ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX)
+ select RAID5_DMA_ARCH_NEEDS_CHAN_SWITCH if (ARCH_IOP32X || ARCH_IOP33X)
+default m
+---help---
+ Enable support for the Intel(R) IOP Series RAID engines.
+
+config RAID5_DMA_ARCH_NEEDS_CHAN_SWITCH
+ bool
+
endmenu
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 4e36d6e..233eae7 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_DMA_ENGINE) += dmaengine.o
obj-$(CONFIG_NET_DMA) += iovlock.o
obj-$(CONFIG_RAID5_DMA) += raid5-dma.o
obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o
+obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
new file mode 100644
index 000..51f1c54
--- /dev/null
+++ b/drivers/dma/iop-adma.c
@@ -0,0 +1,1501 @@
+/*
+ * Copyright(c) 2006 Intel Corporation. All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+
+/*
+ * This driver supports the asynchrounous DMA copy and RAID engines available
+ * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
+ */
+
+#include linux/init.h
+#include linux/module.h
+#include linux/dmaengine.h
