ipq806x: Add support for linux-4.4

1)Changes

- Rebased the patches for linux-4.4.7
- Added patch to fix spi nor fifo and dma support
- Added patch to configure watchdog barktime

2)Testing

Tested on IPQ AP148 Board:
 a. NOR boot and NAND boot
 b. ethernet network and ath10k wifi
 c. ubi sysupgrade

UnTested
 dwc3 usb has not been validated on IPQ board(AP148)

3)Known Issues:
 Once we flash ubi image on AP148, and if we reset the board, uboot on
 first boot creates PEB and LEB for dynamic sized partitions, which is incorrect
 and not what linux expects which causes errors when trying to mount rootfs.
 In order to test this, we can use the below steps:
  a. Flash the ubi image on board and don't reset the board
  b. load the kernel fit image in RAM and boot from there.

Signed-off-by: Ram Chandra Jangir <rjangi@codeaurora.org>

1 files changed, 272 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-4.4/140-clk-qcom-Add-support-for-Krait-clocks.patch b/target/linux/ipq806x/patches-4.4/140-clk-qcom-Add-support-for-Krait-clocks.patch
new file mode 100644
index 0000000000..522482d841
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/140-clk-qcom-Add-support-for-Krait-clocks.patch
@@ -0,0 +1,272 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v3,09/13] clk: qcom: Add support for Krait clocks
+From: Stephen Boyd <sboyd@codeaurora.org>
+X-Patchwork-Id: 6063251
+Message-Id: <1426920332-9340-10-git-send-email-sboyd@codeaurora.org>
+To: Mike Turquette <mturquette@linaro.org>, Stephen Boyd <sboyd@codeaurora.org>
+Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
+	linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
+	Viresh Kumar <viresh.kumar@linaro.org>
+Date: Fri, 20 Mar 2015 23:45:28 -0700
+
+The Krait clocks are made up of a series of muxes and a divider
+that choose between a fixed rate clock and dedicated HFPLLs for
+each CPU. Instead of using mmio accesses to remux parents, the
+Krait implementation exposes the remux control via cp15
+registers. Support these clocks.
+
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+
+---
+drivers/clk/qcom/Kconfig     |   4 ++
+ drivers/clk/qcom/Makefile    |   1 +
+ drivers/clk/qcom/clk-krait.c | 166 +++++++++++++++++++++++++++++++++++++++++++
+ drivers/clk/qcom/clk-krait.h |  49 +++++++++++++
+ 4 files changed, 220 insertions(+)
+ create mode 100644 drivers/clk/qcom/clk-krait.c
+ create mode 100644 drivers/clk/qcom/clk-krait.h
+
+--- a/drivers/clk/qcom/Kconfig
++++ b/drivers/clk/qcom/Kconfig
+@@ -114,3 +114,7 @@
+ 	  Support for the high-frequency PLLs present on Qualcomm devices.
+ 	  Say Y if you want to support CPU frequency scaling on devices
+ 	  such as MSM8974, APQ8084, etc.
++
++config KRAIT_CLOCKS
++	bool
++	select KRAIT_L2_ACCESSORS
+--- a/drivers/clk/qcom/Makefile
++++ b/drivers/clk/qcom/Makefile
+@@ -8,6 +8,7 @@
+ clk-qcom-y += clk-branch.o
+ clk-qcom-y += clk-regmap-divider.o
+ clk-qcom-y += clk-regmap-mux.o
++clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-krait.o
+ clk-qcom-y += clk-hfpll.o
+ clk-qcom-y += reset.o
+ clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
+ 
+--- /dev/null
++++ b/drivers/clk/qcom/clk-krait.c
+@@ -0,0 +1,166 @@
++/*
++ * Copyright (c) 2013-2014, The Linux Foundation. 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 version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * 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.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/delay.h>
++#include <linux/err.h>
++#include <linux/clk-provider.h>
++#include <linux/spinlock.h>
++
++#include <asm/krait-l2-accessors.h>
++
++#include "clk-krait.h"
++
++/* Secondary and primary muxes share the same cp15 register */
++static DEFINE_SPINLOCK(krait_clock_reg_lock);
++
++#define LPL_SHIFT	8
++static void __krait_mux_set_sel(struct krait_mux_clk *mux, int sel)
++{
++	unsigned long flags;
++	u32 regval;
++
++	spin_lock_irqsave(&krait_clock_reg_lock, flags);
++	regval = krait_get_l2_indirect_reg(mux->offset);
++	regval &= ~(mux->mask << mux->shift);
++	regval |= (sel & mux->mask) << mux->shift;
++	if (mux->lpl) {
++		regval &= ~(mux->mask << (mux->shift + LPL_SHIFT));
++		regval |= (sel & mux->mask) << (mux->shift + LPL_SHIFT);
++	}
++	krait_set_l2_indirect_reg(mux->offset, regval);
++	spin_unlock_irqrestore(&krait_clock_reg_lock, flags);
++
++	/* Wait for switch to complete. */
++	mb();
++	udelay(1);
++}
++
++static int krait_mux_set_parent(struct clk_hw *hw, u8 index)
++{
++	struct krait_mux_clk *mux = to_krait_mux_clk(hw);
++	u32 sel;
++
++	sel = clk_mux_reindex(index, mux->parent_map, 0);
++	mux->en_mask = sel;
++	/* Don't touch mux if CPU is off as it won't work */
++	if (__clk_is_enabled(hw->clk))
++		__krait_mux_set_sel(mux, sel);
++	return 0;
++}
++
++static u8 krait_mux_get_parent(struct clk_hw *hw)
++{
++	struct krait_mux_clk *mux = to_krait_mux_clk(hw);
++	u32 sel;
++
++	sel = krait_get_l2_indirect_reg(mux->offset);
++	sel >>= mux->shift;
++	sel &= mux->mask;
++	mux->en_mask = sel;
++
++	return clk_mux_get_parent(hw, sel, mux->parent_map, 0);
++}
++
++static struct clk_hw *krait_mux_get_safe_parent(struct clk_hw *hw)
++{
++	int i;
++	struct krait_mux_clk *mux = to_krait_mux_clk(hw);
++	int num_parents = clk_hw_get_num_parents(hw->clk);
++
++	i = mux->safe_sel;
++	for (i = 0; i < num_parents; i++)
++		if (mux->safe_sel == mux->parent_map[i])
++			break;
++
++	return __clk_get_hw(clk_hw_get_parent_by_index(hw->clk, i));
++}
++
++static int krait_mux_enable(struct clk_hw *hw)
++{
++	struct krait_mux_clk *mux = to_krait_mux_clk(hw);
++
++	__krait_mux_set_sel(mux, mux->en_mask);
++
++	return 0;
++}
++
++static void krait_mux_disable(struct clk_hw *hw)
++{
++	struct krait_mux_clk *mux = to_krait_mux_clk(hw);
++
++	__krait_mux_set_sel(mux, mux->safe_sel);
++}
++
++const struct clk_ops krait_mux_clk_ops = {
++	.enable = krait_mux_enable,
++	.disable = krait_mux_disable,
++	.set_parent = krait_mux_set_parent,
++	.get_parent = krait_mux_get_parent,
++	.determine_rate = __clk_mux_determine_rate_closest,
++	.get_safe_parent = krait_mux_get_safe_parent,
++};
++EXPORT_SYMBOL_GPL(krait_mux_clk_ops);
++
++/* The divider can divide by 2, 4, 6 and 8. But we only really need div-2. */
++static long krait_div2_round_rate(struct clk_hw *hw, unsigned long rate,
++				  unsigned long *parent_rate)
++{
++	*parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw->clk), rate * 2);
++	return DIV_ROUND_UP(*parent_rate, 2);
++}
++
++static int krait_div2_set_rate(struct clk_hw *hw, unsigned long rate,
++			unsigned long parent_rate)
++{
++	struct krait_div2_clk *d = to_krait_div2_clk(hw);
++	unsigned long flags;
++	u32 val;
++	u32 mask = BIT(d->width) - 1;
++
++	if (d->lpl)
++		mask = mask << (d->shift + LPL_SHIFT) | mask << d->shift;
++
++	spin_lock_irqsave(&krait_clock_reg_lock, flags);
++	val = krait_get_l2_indirect_reg(d->offset);
++	val &= ~mask;
++	krait_set_l2_indirect_reg(d->offset, val);
++	spin_unlock_irqrestore(&krait_clock_reg_lock, flags);
++
++	return 0;
++}
++
++static unsigned long
++krait_div2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
++{
++	struct krait_div2_clk *d = to_krait_div2_clk(hw);
++	u32 mask = BIT(d->width) - 1;
++	u32 div;
++
++	div = krait_get_l2_indirect_reg(d->offset);
++	div >>= d->shift;
++	div &= mask;
++	div = (div + 1) * 2;
++
++	return DIV_ROUND_UP(parent_rate, div);
++}
++
++const struct clk_ops krait_div2_clk_ops = {
++	.round_rate = krait_div2_round_rate,
++	.set_rate = krait_div2_set_rate,
++	.recalc_rate = krait_div2_recalc_rate,
++};
++EXPORT_SYMBOL_GPL(krait_div2_clk_ops);
+--- /dev/null
++++ b/drivers/clk/qcom/clk-krait.h
+@@ -0,0 +1,49 @@
++/*
++ * Copyright (c) 2013, The Linux Foundation. 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 version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * 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.
++ */
++
++#ifndef __QCOM_CLK_KRAIT_H
++#define __QCOM_CLK_KRAIT_H
++
++#include <linux/clk-provider.h>
++
++struct krait_mux_clk {
++	unsigned int	*parent_map;
++	bool		has_safe_parent;
++	u8		safe_sel;
++	u32		offset;
++	u32		mask;
++	u32		shift;
++	u32		en_mask;
++	bool		lpl;
++
++	struct clk_hw	hw;
++};
++
++#define to_krait_mux_clk(_hw) container_of(_hw, struct krait_mux_clk, hw)
++
++extern const struct clk_ops krait_mux_clk_ops;
++
++struct krait_div2_clk {
++	u32		offset;
++	u8		width;
++	u32		shift;
++	bool		lpl;
++
++	struct clk_hw	hw;
++};
++
++#define to_krait_div2_clk(_hw) container_of(_hw, struct krait_div2_clk, hw)
++
++extern const struct clk_ops krait_div2_clk_ops;
++
++#endif