ipq806x: Add ADM support

These are cherry-picked & backported from LKML:
*https://lkml.org/lkml/2015/3/17/19

They are enabled on both 3.18 and 4.1 kernel. Patches 150 to 154 are
applying changes merged since 3.18; they enable mechanisms used by the
ADM driver.

ADM engine is used by the NAND controller, so it is necessary to
bring-up NAND flash support.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

SVN-Revision: 46567

1 files changed, 70 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-3.18/150-dmaengine-Rework-dma_chan_get.patch b/target/linux/ipq806x/patches-3.18/150-dmaengine-Rework-dma_chan_get.patch
new file mode 100644
index 0000000..880e67c
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/150-dmaengine-Rework-dma_chan_get.patch
@@ -0,0 +1,70 @@
+From d2f4f99db3e9ec8b063cf2e45704e2bb95428317 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime.ripard@free-electrons.com>
+Date: Mon, 17 Nov 2014 14:41:58 +0100
+Subject: [PATCH] dmaengine: Rework dma_chan_get
+
+dma_chan_get uses a rather interesting error handling and code path.
+
+Change it to something more usual in the kernel.
+
+Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
+Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+Signed-off-by: Vinod Koul <vinod.koul@intel.com>
+---
+ drivers/dma/dmaengine.c | 36 +++++++++++++++++++-----------------
+ 1 file changed, 19 insertions(+), 17 deletions(-)
+
+--- a/drivers/dma/dmaengine.c
++++ b/drivers/dma/dmaengine.c
+@@ -222,31 +222,33 @@ static void balance_ref_count(struct dma
+  */
+ static int dma_chan_get(struct dma_chan *chan)
+ {
+-	int err = -ENODEV;
+ 	struct module *owner = dma_chan_to_owner(chan);
++	int ret;
+ 
++	/* The channel is already in use, update client count */
+ 	if (chan->client_count) {
+ 		__module_get(owner);
+-		err = 0;
+-	} else if (try_module_get(owner))
+-		err = 0;
++		goto out;
++	}
+ 
+-	if (err == 0)
+-		chan->client_count++;
++	if (!try_module_get(owner))
++		return -ENODEV;
+ 
+ 	/* allocate upon first client reference */
+-	if (chan->client_count == 1 && err == 0) {
+-		int desc_cnt = chan->device->device_alloc_chan_resources(chan);
+-
+-		if (desc_cnt < 0) {
+-			err = desc_cnt;
+-			chan->client_count = 0;
+-			module_put(owner);
+-		} else if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask))
+-			balance_ref_count(chan);
+-	}
+-
+-	return err;
++	ret = chan->device->device_alloc_chan_resources(chan);
++	if (ret < 0)
++		goto err_out;
++
++	if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask))
++		balance_ref_count(chan);
++
++out:
++	chan->client_count++;
++	return 0;
++
++err_out:
++	module_put(owner);
++	return ret;
+ }
+ 
+ /**