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, 435 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-4.4/142-clk-qcom-Add-Krait-clock-controller-driver.patch b/target/linux/ipq806x/patches-4.4/142-clk-qcom-Add-Krait-clock-controller-driver.patch
new file mode 100644
index 0000000000..f0e946781b
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/142-clk-qcom-Add-Krait-clock-controller-driver.patch
@@ -0,0 +1,435 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v3,11/13] clk: qcom: Add Krait clock controller driver
+From: Stephen Boyd <sboyd@codeaurora.org>
+X-Patchwork-Id: 6063121
+Message-Id: <1426920332-9340-12-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>, <devicetree@vger.kernel.org>
+Date: Fri, 20 Mar 2015 23:45:30 -0700
+
+The Krait CPU clocks are made up of a primary mux and secondary
+mux for each CPU and the L2, controlled via cp15 accessors. For
+Kraits within KPSSv1 each secondary mux accepts a different aux
+source, but on KPSSv2 each secondary mux accepts the same aux
+source.
+
+Cc: <devicetree@vger.kernel.org>
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+
+---
+.../devicetree/bindings/clock/qcom,krait-cc.txt    |  22 ++
+ drivers/clk/qcom/Kconfig                           |   8 +
+ drivers/clk/qcom/Makefile                          |   1 +
+ drivers/clk/qcom/krait-cc.c                        | 352 +++++++++++++++++++++
+ 4 files changed, 383 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/clock/qcom,krait-cc.txt
+ create mode 100644 drivers/clk/qcom/krait-cc.c
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/clock/qcom,krait-cc.txt
+@@ -0,0 +1,22 @@
++Krait Clock Controller
++
++PROPERTIES
++
++- compatible:
++	Usage: required
++	Value type: <string>
++	Definition: must be one of:
++			"qcom,krait-cc-v1"
++			"qcom,krait-cc-v2"
++
++- #clock-cells:
++	Usage: required
++	Value type: <u32>
++	Definition: must be 1
++
++Example:
++
++	kraitcc: clock-controller {
++		compatible = "qcom,krait-cc-v1";
++		#clock-cells = <1>;
++	};
+--- a/drivers/clk/qcom/Kconfig
++++ b/drivers/clk/qcom/Kconfig
+@@ -123,6 +123,14 @@
+ 	  if you want to support CPU frequency scaling on devices such
+ 	  as MSM8960, APQ8064, etc.
+ 
++config KRAITCC
++	tristate "Krait Clock Controller"
++	depends on COMMON_CLK_QCOM && ARM
++	select KRAIT_CLOCKS
++	help
++	  Support for the Krait CPU clocks on Qualcomm devices.
++	  Say Y if you want to support CPU frequency scaling.
++
+ config KRAIT_CLOCKS
+ 	bool
+ 	select KRAIT_L2_ACCESSORS
+--- a/drivers/clk/qcom/Makefile
++++ b/drivers/clk/qcom/Makefile
+@@ -26,3 +26,4 @@
+ obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
+ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
+ obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
++obj-$(CONFIG_KRAITCC) += krait-cc.o
+--- /dev/null
++++ b/drivers/clk/qcom/krait-cc.c
+@@ -0,0 +1,352 @@
++/* Copyright (c) 2013-2015, 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/init.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/err.h>
++#include <linux/io.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/clk.h>
++#include <linux/clk-provider.h>
++#include <linux/slab.h>
++
++#include "clk-krait.h"
++
++static unsigned int sec_mux_map[] = {
++	2,
++	0,
++};
++
++static unsigned int pri_mux_map[] = {
++	1,
++	2,
++	0,
++};
++
++static int
++krait_add_div(struct device *dev, int id, const char *s, unsigned offset)
++{
++	struct krait_div2_clk *div;
++	struct clk_init_data init = {
++		.num_parents = 1,
++		.ops = &krait_div2_clk_ops,
++		.flags = CLK_SET_RATE_PARENT,
++	};
++	const char *p_names[1];
++	struct clk *clk;
++
++	div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
++	if (!div)
++		return -ENOMEM;
++
++	div->width = 2;
++	div->shift = 6;
++	div->lpl = id >= 0;
++	div->offset = offset;
++	div->hw.init = &init;
++
++	init.name = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
++	if (!init.name)
++		return -ENOMEM;
++
++	init.parent_names = p_names;
++	p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
++	if (!p_names[0]) {
++		kfree(init.name);
++		return -ENOMEM;
++	}
++
++	clk = devm_clk_register(dev, &div->hw);
++	kfree(p_names[0]);
++	kfree(init.name);
++
++	return PTR_ERR_OR_ZERO(clk);
++}
++
++static int
++krait_add_sec_mux(struct device *dev, int id, const char *s, unsigned offset,
++		  bool unique_aux)
++{
++	struct krait_mux_clk *mux;
++	static const char *sec_mux_list[] = {
++		"acpu_aux",
++		"qsb",
++	};
++	struct clk_init_data init = {
++		.parent_names = sec_mux_list,
++		.num_parents = ARRAY_SIZE(sec_mux_list),
++		.ops = &krait_mux_clk_ops,
++		.flags = CLK_SET_RATE_PARENT,
++	};
++	struct clk *clk;
++
++	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
++	if (!mux)
++		return -ENOMEM;
++
++	mux->offset = offset;
++	mux->lpl = id >= 0;
++	mux->has_safe_parent = true;
++	mux->safe_sel = 2;
++	mux->mask = 0x3;
++	mux->shift = 2;
++	mux->parent_map = sec_mux_map;
++	mux->hw.init = &init;
++
++	init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
++	if (!init.name)
++		return -ENOMEM;
++
++	if (unique_aux) {
++		sec_mux_list[0] = kasprintf(GFP_KERNEL, "acpu%s_aux", s);
++		if (!sec_mux_list[0]) {
++			clk = ERR_PTR(-ENOMEM);
++			goto err_aux;
++		}
++	}
++
++	clk = devm_clk_register(dev, &mux->hw);
++
++	if (unique_aux)
++		kfree(sec_mux_list[0]);
++err_aux:
++	kfree(init.name);
++	return PTR_ERR_OR_ZERO(clk);
++}
++
++static struct clk *
++krait_add_pri_mux(struct device *dev, int id, const char *s, unsigned offset)
++{
++	struct krait_mux_clk *mux;
++	const char *p_names[3];
++	struct clk_init_data init = {
++		.parent_names = p_names,
++		.num_parents = ARRAY_SIZE(p_names),
++		.ops = &krait_mux_clk_ops,
++		.flags = CLK_SET_RATE_PARENT,
++	};
++	struct clk *clk;
++
++	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
++	if (!mux)
++		return ERR_PTR(-ENOMEM);
++
++	mux->has_safe_parent = true;
++	mux->safe_sel = 0;
++	mux->mask = 0x3;
++	mux->shift = 0;
++	mux->offset = offset;
++	mux->lpl = id >= 0;
++	mux->parent_map = pri_mux_map;
++	mux->hw.init = &init;
++
++	init.name = kasprintf(GFP_KERNEL, "krait%s_pri_mux", s);
++	if (!init.name)
++		return ERR_PTR(-ENOMEM);
++
++	p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
++	if (!p_names[0]) {
++		clk = ERR_PTR(-ENOMEM);
++		goto err_p0;
++	}
++
++	p_names[1] = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
++	if (!p_names[1]) {
++		clk = ERR_PTR(-ENOMEM);
++		goto err_p1;
++	}
++
++	p_names[2] = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
++	if (!p_names[2]) {
++		clk = ERR_PTR(-ENOMEM);
++		goto err_p2;
++	}
++
++	clk = devm_clk_register(dev, &mux->hw);
++
++	kfree(p_names[2]);
++err_p2:
++	kfree(p_names[1]);
++err_p1:
++	kfree(p_names[0]);
++err_p0:
++	kfree(init.name);
++	return clk;
++}
++
++/* id < 0 for L2, otherwise id == physical CPU number */
++static struct clk *krait_add_clks(struct device *dev, int id, bool unique_aux)
++{
++	int ret;
++	unsigned offset;
++	void *p = NULL;
++	const char *s;
++	struct clk *clk;
++
++	if (id >= 0) {
++		offset = 0x4501 + (0x1000 * id);
++		s = p = kasprintf(GFP_KERNEL, "%d", id);
++		if (!s)
++			return ERR_PTR(-ENOMEM);
++	} else {
++		offset = 0x500;
++		s = "_l2";
++	}
++
++	ret = krait_add_div(dev, id, s, offset);
++	if (ret) {
++		clk = ERR_PTR(ret);
++		goto err;
++	}
++
++	ret = krait_add_sec_mux(dev, id, s, offset, unique_aux);
++	if (ret) {
++		clk = ERR_PTR(ret);
++		goto err;
++	}
++
++	clk = krait_add_pri_mux(dev, id, s, offset);
++err:
++	kfree(p);
++	return clk;
++}
++
++static struct clk *krait_of_get(struct of_phandle_args *clkspec, void *data)
++{
++	unsigned int idx = clkspec->args[0];
++	struct clk **clks = data;
++
++	if (idx >= 5) {
++		pr_err("%s: invalid clock index %d\n", __func__, idx);
++		return ERR_PTR(-EINVAL);
++	}
++
++	return clks[idx] ? : ERR_PTR(-ENODEV);
++}
++
++static const struct of_device_id krait_cc_match_table[] = {
++	{ .compatible = "qcom,krait-cc-v1", (void *)1UL },
++	{ .compatible = "qcom,krait-cc-v2" },
++	{}
++};
++MODULE_DEVICE_TABLE(of, krait_cc_match_table);
++
++static int krait_cc_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	const struct of_device_id *id;
++	unsigned long cur_rate, aux_rate;
++	int cpu;
++	struct clk *clk;
++	struct clk **clks;
++	struct clk *l2_pri_mux_clk;
++
++	id = of_match_device(krait_cc_match_table, dev);
++	if (!id)
++		return -ENODEV;
++
++	/* Rate is 1 because 0 causes problems for __clk_mux_determine_rate */
++	clk = clk_register_fixed_rate(dev, "qsb", NULL, CLK_IS_ROOT, 1);
++	if (IS_ERR(clk))
++		return PTR_ERR(clk);
++
++	if (!id->data) {
++		clk = clk_register_fixed_factor(dev, "acpu_aux",
++						"gpll0_vote", 0, 1, 2);
++		if (IS_ERR(clk))
++			return PTR_ERR(clk);
++	}
++
++	/* Krait configurations have at most 4 CPUs and one L2 */
++	clks = devm_kcalloc(dev, 5, sizeof(*clks), GFP_KERNEL);
++	if (!clks)
++		return -ENOMEM;
++
++	for_each_possible_cpu(cpu) {
++		clk = krait_add_clks(dev, cpu, id->data);
++		if (IS_ERR(clk))
++			return PTR_ERR(clk);
++		clks[cpu] = clk;
++	}
++
++	l2_pri_mux_clk = krait_add_clks(dev, -1, id->data);
++	if (IS_ERR(l2_pri_mux_clk))
++		return PTR_ERR(l2_pri_mux_clk);
++	clks[4] = l2_pri_mux_clk;
++
++	/*
++	 * We don't want the CPU or L2 clocks to be turned off at late init
++	 * if CPUFREQ or HOTPLUG configs are disabled. So, bump up the
++	 * refcount of these clocks. Any cpufreq/hotplug manager can assume
++	 * that the clocks have already been prepared and enabled by the time
++	 * they take over.
++	 */
++	for_each_online_cpu(cpu) {
++		clk_prepare_enable(l2_pri_mux_clk);
++		WARN(clk_prepare_enable(clks[cpu]),
++			"Unable to turn on CPU%d clock", cpu);
++	}
++
++	/*
++	 * Force reinit of HFPLLs and muxes to overwrite any potential
++	 * incorrect configuration of HFPLLs and muxes by the bootloader.
++	 * While at it, also make sure the cores are running at known rates
++	 * and print the current rate.
++	 *
++	 * The clocks are set to aux clock rate first to make sure the
++	 * secondary mux is not sourcing off of QSB. The rate is then set to
++	 * two different rates to force a HFPLL reinit under all
++	 * circumstances.
++	 */
++	cur_rate = clk_get_rate(l2_pri_mux_clk);
++	aux_rate = 384000000;
++	if (cur_rate == 1) {
++		pr_info("L2 @ QSB rate. Forcing new rate.\n");
++		cur_rate = aux_rate;
++	}
++	clk_set_rate(l2_pri_mux_clk, aux_rate);
++	clk_set_rate(l2_pri_mux_clk, 2);
++	clk_set_rate(l2_pri_mux_clk, cur_rate);
++	pr_info("L2 @ %lu KHz\n", clk_get_rate(l2_pri_mux_clk) / 1000);
++	for_each_possible_cpu(cpu) {
++		clk = clks[cpu];
++		cur_rate = clk_get_rate(clk);
++		if (cur_rate == 1) {
++			pr_info("CPU%d @ QSB rate. Forcing new rate.\n", cpu);
++			cur_rate = aux_rate;
++		}
++		clk_set_rate(clk, aux_rate);
++		clk_set_rate(clk, 2);
++		clk_set_rate(clk, cur_rate);
++		pr_info("CPU%d @ %lu KHz\n", cpu, clk_get_rate(clk) / 1000);
++	}
++
++	of_clk_add_provider(dev->of_node, krait_of_get, clks);
++
++	return 0;
++}
++
++static struct platform_driver krait_cc_driver = {
++	.probe = krait_cc_probe,
++	.driver = {
++		.name = "krait-cc",
++		.of_match_table = krait_cc_match_table,
++	},
++};
++module_platform_driver(krait_cc_driver);
++
++MODULE_DESCRIPTION("Krait CPU Clock Driver");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:krait-cc");