ipq806x: Add support for IPQ806x chip family

Patches are generated using the "format-patch" command from the
following location:
*https://www.codeaurora.org/cgit/quic/kernel/galak-msm/log/?h=apq_ipq_base
*rev=0771849495b4128cac2faf7d49c85c729fc48b20
Patches numbered 76/77/102/103 have already been integrated in 3.14.12,
so they're not in this list.

All these patches are either integrated are pending integration into
kernel.org, therefore these patches should go away once the kernel
gets upgraded to 3.16.

Support is currently limited to AP148 board but can be extended to other
platforms in the future.

These changes do not cover ethernet connectivity.

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

SVN-Revision: 42334

1 files changed, 155 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches/0126-clk-Add-safe-switch-hook.patch b/target/linux/ipq806x/patches/0126-clk-Add-safe-switch-hook.patch
new file mode 100644
index 0000000000..bda409363e
--- /dev/null
+++ b/target/linux/ipq806x/patches/0126-clk-Add-safe-switch-hook.patch
@@ -0,0 +1,155 @@
+From b7b3ceec506179d59e46e3a8ea8b370872cc7fcb Mon Sep 17 00:00:00 2001
+From: Stephen Boyd <sboyd@codeaurora.org>
+Date: Mon, 31 Mar 2014 16:52:29 -0700
+Subject: [PATCH 126/182] clk: Add safe switch hook
+
+Sometimes clocks can't accept their parent source turning off
+while the source is reprogrammed to a different rate. Most
+notably CPU clocks require a way to switch away from the current
+PLL they're running on, reprogram that PLL to a new rate, and
+then switch back to the PLL with the new rate once they're done.
+Add a hook that drivers can implement allowing them to return a
+'safe parent' that they can switch their parent to while the
+upstream source is reprogrammed to support this.
+
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+---
+ drivers/clk/clk.c            |   53 ++++++++++++++++++++++++++++++++++++------
+ include/linux/clk-private.h  |    2 ++
+ include/linux/clk-provider.h |    1 +
+ 3 files changed, 49 insertions(+), 7 deletions(-)
+
+diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
+index b94a311..0582068 100644
+--- a/drivers/clk/clk.c
++++ b/drivers/clk/clk.c
+@@ -1356,6 +1356,7 @@ static void clk_calc_subtree(struct clk *clk, unsigned long new_rate,
+ 			     struct clk *new_parent, u8 p_index)
+ {
+ 	struct clk *child;
++	struct clk *parent;
+ 
+ 	clk->new_rate = new_rate;
+ 	clk->new_parent = new_parent;
+@@ -1365,6 +1366,17 @@ static void clk_calc_subtree(struct clk *clk, unsigned long new_rate,
+ 	if (new_parent && new_parent != clk->parent)
+ 		new_parent->new_child = clk;
+ 
++	if (clk->ops->get_safe_parent) {
++		parent = clk->ops->get_safe_parent(clk->hw);
++		if (parent) {
++			p_index = clk_fetch_parent_index(clk, parent);
++			clk->safe_parent_index = p_index;
++			clk->safe_parent = parent;
++		}
++	} else {
++		clk->safe_parent = NULL;
++	}
++
+ 	hlist_for_each_entry(child, &clk->children, child_node) {
+ 		if (child->ops->recalc_rate)
+ 			child->new_rate = child->ops->recalc_rate(child->hw, new_rate);
+@@ -1450,14 +1462,42 @@ out:
+ static struct clk *clk_propagate_rate_change(struct clk *clk, unsigned long event)
+ {
+ 	struct clk *child, *tmp_clk, *fail_clk = NULL;
++	struct clk *old_parent;
+ 	int ret = NOTIFY_DONE;
+ 
+-	if (clk->rate == clk->new_rate)
++	if (clk->rate == clk->new_rate && event != POST_RATE_CHANGE)
+ 		return NULL;
+ 
++	switch (event) {
++	case PRE_RATE_CHANGE:
++		if (clk->safe_parent)
++			clk->ops->set_parent(clk->hw, clk->safe_parent_index);
++		break;
++	case POST_RATE_CHANGE:
++		if (clk->safe_parent) {
++			old_parent = __clk_set_parent_before(clk,
++							     clk->new_parent);
++			if (clk->ops->set_rate_and_parent) {
++				clk->ops->set_rate_and_parent(clk->hw,
++						clk->new_rate,
++						clk->new_parent ?
++						clk->new_parent->rate : 0,
++						clk->new_parent_index);
++			} else if (clk->ops->set_parent) {
++				clk->ops->set_parent(clk->hw,
++						clk->new_parent_index);
++			}
++			__clk_set_parent_after(clk, clk->new_parent,
++					       old_parent);
++		}
++		break;
++	}
++
+ 	if (clk->notifier_count) {
+-		ret = __clk_notify(clk, event, clk->rate, clk->new_rate);
+-		if (ret & NOTIFY_STOP_MASK)
++		if (event != POST_RATE_CHANGE)
++			ret = __clk_notify(clk, event, clk->rate,
++					   clk->new_rate);
++		if (ret & NOTIFY_STOP_MASK && event != POST_RATE_CHANGE)
+ 			fail_clk = clk;
+ 	}
+ 
+@@ -1499,7 +1539,8 @@ static void clk_change_rate(struct clk *clk)
+ 	else if (clk->parent)
+ 		best_parent_rate = clk->parent->rate;
+ 
+-	if (clk->new_parent && clk->new_parent != clk->parent) {
++	if (clk->new_parent && clk->new_parent != clk->parent &&
++			!clk->safe_parent) {
+ 		old_parent = __clk_set_parent_before(clk, clk->new_parent);
+ 
+ 		if (clk->ops->set_rate_and_parent) {
+@@ -1522,9 +1563,6 @@ static void clk_change_rate(struct clk *clk)
+ 	else
+ 		clk->rate = best_parent_rate;
+ 
+-	if (clk->notifier_count && old_rate != clk->rate)
+-		__clk_notify(clk, POST_RATE_CHANGE, old_rate, clk->rate);
+-
+ 	hlist_for_each_entry(child, &clk->children, child_node) {
+ 		/* Skip children who will be reparented to another clock */
+ 		if (child->new_parent && child->new_parent != clk)
+@@ -1598,6 +1636,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
+ 	/* change the rates */
+ 	clk_change_rate(top);
+ 
++	clk_propagate_rate_change(top, POST_RATE_CHANGE);
+ out:
+ 	clk_prepare_unlock();
+ 
+diff --git a/include/linux/clk-private.h b/include/linux/clk-private.h
+index efbf70b..f48684a 100644
+--- a/include/linux/clk-private.h
++++ b/include/linux/clk-private.h
+@@ -38,8 +38,10 @@ struct clk {
+ 	struct clk		**parents;
+ 	u8			num_parents;
+ 	u8			new_parent_index;
++	u8			safe_parent_index;
+ 	unsigned long		rate;
+ 	unsigned long		new_rate;
++	struct clk		*safe_parent;
+ 	struct clk		*new_parent;
+ 	struct clk		*new_child;
+ 	unsigned long		flags;
+diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
+index 939533d..300fcb8 100644
+--- a/include/linux/clk-provider.h
++++ b/include/linux/clk-provider.h
+@@ -157,6 +157,7 @@ struct clk_ops {
+ 					struct clk **best_parent_clk);
+ 	int		(*set_parent)(struct clk_hw *hw, u8 index);
+ 	u8		(*get_parent)(struct clk_hw *hw);
++	struct clk	*(*get_safe_parent)(struct clk_hw *hw);
+ 	int		(*set_rate)(struct clk_hw *hw, unsigned long,
+ 				    unsigned long);
+ 	int		(*set_rate_and_parent)(struct clk_hw *hw,
+-- 
+1.7.10.4
+