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, 461 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch b/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch
new file mode 100644
index 0000000000..f33c9e0d8c
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch
@@ -0,0 +1,461 @@
+From dd77db4143290689d3a5e1ec61627233d0711b66 Mon Sep 17 00:00:00 2001
+From: Stephen Boyd <sboyd@codeaurora.org>
+Date: Fri, 30 May 2014 16:36:11 -0700
+Subject: [PATCH] FROMLIST: cpufreq: Add a cpufreq-krait based on cpufreq-cpu0
+
+Krait processors have individual clocks for each CPU that can
+scale independently from one another. cpufreq-cpu0 is fairly
+close to this, but assumes that there is only one clock for all
+CPUs. Add a driver to support the Krait configuration.
+
+TODO: Merge into cpufreq-cpu0? Or make generic?
+
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+
+---
+ drivers/cpufreq/Kconfig         |  13 +++
+ drivers/cpufreq/Makefile        |   1 +
+ drivers/cpufreq/cpufreq-krait.c | 190 ++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 204 insertions(+)
+ create mode 100644 drivers/cpufreq/cpufreq-krait.c
+
+--- a/drivers/cpufreq/Kconfig
++++ b/drivers/cpufreq/Kconfig
+@@ -198,6 +198,19 @@
+ 
+ 	  If in doubt, say N.
+ 
++config GENERIC_CPUFREQ_KRAIT
++	tristate "Krait cpufreq driver"
++	depends on HAVE_CLK && OF
++	# if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
++	depends on !CPU_THERMAL || THERMAL
++	select PM_OPP
++	help
++	  This adds a generic cpufreq driver for CPU0 frequency management.
++	  It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
++	  systems which share clock and voltage across all CPUs.
++
++	  If in doubt, say N.
++
+ if X86
+ source "drivers/cpufreq/Kconfig.x86"
+ endif
+--- a/drivers/cpufreq/Makefile
++++ b/drivers/cpufreq/Makefile
+@@ -13,6 +13,7 @@
+ obj-$(CONFIG_CPU_FREQ_GOV_COMMON)		+= cpufreq_governor.o
+ 
+ obj-$(CONFIG_CPUFREQ_DT)		+= cpufreq-dt.o
++obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT)    += cpufreq-krait.o
+ 
+ ##################################################################################
+ # x86 drivers.
+--- /dev/null
++++ b/drivers/cpufreq/cpufreq-krait.c
+@@ -0,0 +1,390 @@
++/*
++ * Copyright (C) 2012 Freescale Semiconductor, Inc.
++ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
++ *
++ * The OPP code in function krait_set_target() is reused from
++ * drivers/cpufreq/omap-cpufreq.c
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/clk.h>
++#include <linux/cpu.h>
++#include <linux/cpu_cooling.h>
++#include <linux/cpufreq.h>
++#include <linux/cpumask.h>
++#include <linux/err.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/pm_opp.h>
++#include <linux/platform_device.h>
++#include <linux/regulator/consumer.h>
++#include <linux/slab.h>
++#include <linux/thermal.h>
++
++static unsigned int transition_latency;
++static unsigned int voltage_tolerance; /* in percentage */
++
++static struct device *cpu_dev;
++static DEFINE_PER_CPU(struct clk *, krait_cpu_clks);
++static DEFINE_PER_CPU(struct regulator *, krait_supply_core);
++static struct cpufreq_frequency_table *freq_table;
++static struct thermal_cooling_device *cdev;
++
++struct cache_points {
++	unsigned long cache_freq;
++	unsigned int cache_volt;
++	unsigned long cpu_freq;
++};
++
++static struct regulator *krait_l2_reg;
++static struct clk *krait_l2_clk;
++static struct cache_points *krait_l2_points;
++static int nr_krait_l2_points;
++
++static int krait_parse_cache_points(struct device *dev,
++		struct device_node *of_node)
++{
++	const struct property *prop;
++	const __be32 *val;
++	int nr, i;
++
++	prop = of_find_property(of_node, "cache-points-kHz", NULL);
++	if (!prop)
++		return -ENODEV;
++	if (!prop->value)
++		return -ENODATA;
++
++	/*
++	 * Each OPP is a set of tuples consisting of frequency and
++	 * cpu-frequency like <freq-kHz volt-uV freq-kHz>.
++	 */
++	nr = prop->length / sizeof(u32);
++	if (nr % 3) {
++		dev_err(dev, "%s: Invalid cache points\n", __func__);
++		return -EINVAL;
++	}
++	nr /= 3;
++
++	krait_l2_points = devm_kcalloc(dev, nr, sizeof(*krait_l2_points),
++				       GFP_KERNEL);
++	if (!krait_l2_points)
++		return -ENOMEM;
++	nr_krait_l2_points = nr;
++
++	for (i = 0, val = prop->value; i < nr; i++) {
++		unsigned long cache_freq = be32_to_cpup(val++) * 1000;
++		unsigned int cache_volt = be32_to_cpup(val++);
++		unsigned long cpu_freq = be32_to_cpup(val++) * 1000;
++
++		krait_l2_points[i].cache_freq = cache_freq;
++		krait_l2_points[i].cache_volt = cache_volt;
++		krait_l2_points[i].cpu_freq = cpu_freq;
++	}
++
++	return 0;
++}
++
++static int krait_set_target(struct cpufreq_policy *policy, unsigned int index)
++{
++	struct dev_pm_opp *opp;
++	unsigned long volt = 0, volt_old = 0, tol = 0;
++	unsigned long freq, max_cpu_freq = 0;
++	unsigned int old_freq, new_freq;
++	long freq_Hz, freq_exact;
++	int ret, i;
++	struct clk *cpu_clk;
++	struct regulator *core;
++	unsigned int cpu;
++
++	cpu_clk = per_cpu(krait_cpu_clks, policy->cpu);
++
++	freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
++	if (freq_Hz <= 0)
++		freq_Hz = freq_table[index].frequency * 1000;
++
++	freq_exact = freq_Hz;
++	new_freq = freq_Hz / 1000;
++	old_freq = clk_get_rate(cpu_clk) / 1000;
++
++	core = per_cpu(krait_supply_core, policy->cpu);
++
++	rcu_read_lock();
++	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
++	if (IS_ERR(opp)) {
++		rcu_read_unlock();
++		pr_err("failed to find OPP for %ld\n", freq_Hz);
++		return PTR_ERR(opp);
++	}
++	volt = dev_pm_opp_get_voltage(opp);
++	rcu_read_unlock();
++	tol = volt * voltage_tolerance / 100;
++	volt_old = regulator_get_voltage(core);
++
++	pr_debug("%u MHz, %ld mV --> %u MHz, %ld mV\n",
++		 old_freq / 1000, volt_old ? volt_old / 1000 : -1,
++		 new_freq / 1000, volt ? volt / 1000 : -1);
++
++	/* scaling up?  scale voltage before frequency */
++	if (new_freq > old_freq) {
++		ret = regulator_set_voltage_tol(core, volt, tol);
++		if (ret) {
++			pr_err("failed to scale voltage up: %d\n", ret);
++			return ret;
++		}
++	}
++
++	ret = clk_set_rate(cpu_clk, freq_exact);
++	if (ret) {
++		pr_err("failed to set clock rate: %d\n", ret);
++		return ret;
++	}
++
++	/* scaling down?  scale voltage after frequency */
++	if (new_freq < old_freq) {
++		ret = regulator_set_voltage_tol(core, volt, tol);
++		if (ret) {
++			pr_err("failed to scale voltage down: %d\n", ret);
++			clk_set_rate(cpu_clk, old_freq * 1000);
++		}
++	}
++
++	for_each_possible_cpu(cpu) {
++		freq = clk_get_rate(per_cpu(krait_cpu_clks, cpu));
++		max_cpu_freq = max(max_cpu_freq, freq);
++	}
++
++	for (i = 0; i < nr_krait_l2_points; i++) {
++		if (max_cpu_freq >= krait_l2_points[i].cpu_freq) {
++			if (krait_l2_reg) {
++				ret = regulator_set_voltage_tol(krait_l2_reg,
++						krait_l2_points[i].cache_volt,
++						tol);
++				if (ret) {
++					pr_err("failed to scale l2 voltage: %d\n",
++						ret);
++				}
++			}
++			ret = clk_set_rate(krait_l2_clk,
++					krait_l2_points[i].cache_freq);
++			if (ret)
++				pr_err("failed to scale l2 clk: %d\n", ret);
++			break;
++		}
++
++	}
++
++	return ret;
++}
++
++static int krait_cpufreq_init(struct cpufreq_policy *policy)
++{
++	int ret;
++
++	policy->clk = per_cpu(krait_cpu_clks, policy->cpu);
++
++	ret = cpufreq_table_validate_and_show(policy, freq_table);
++	if (ret) {
++		pr_err("%s: invalid frequency table: %d\n", __func__, ret);
++		return ret;
++	}
++
++	policy->cpuinfo.transition_latency = transition_latency;
++
++	return 0;
++}
++
++static struct cpufreq_driver krait_cpufreq_driver = {
++	.flags = CPUFREQ_STICKY,
++	.verify = cpufreq_generic_frequency_table_verify,
++	.target_index = krait_set_target,
++	.get = cpufreq_generic_get,
++	.init = krait_cpufreq_init,
++	.name = "generic_krait",
++	.attr = cpufreq_generic_attr,
++};
++
++static int krait_cpufreq_probe(struct platform_device *pdev)
++{
++	struct device_node *np, *cache;
++	int ret, i;
++	unsigned int cpu;
++	struct device *dev;
++	struct clk *clk;
++	struct regulator *core;
++	unsigned long freq_Hz, freq, max_cpu_freq = 0;
++	struct dev_pm_opp *opp;
++	unsigned long volt, tol;
++
++	cpu_dev = get_cpu_device(0);
++	if (!cpu_dev) {
++		pr_err("failed to get krait device\n");
++		return -ENODEV;
++	}
++
++	np = of_node_get(cpu_dev->of_node);
++	if (!np) {
++		pr_err("failed to find krait node\n");
++		return -ENOENT;
++	}
++
++	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
++	if (ret) {
++		pr_err("failed to init cpufreq table: %d\n", ret);
++		goto out_put_node;
++	}
++
++	of_property_read_u32(np, "voltage-tolerance", &voltage_tolerance);
++
++	if (of_property_read_u32(np, "clock-latency", &transition_latency))
++		transition_latency = CPUFREQ_ETERNAL;
++
++	cache = of_find_next_cache_node(np);
++	if (cache) {
++		struct device_node *vdd;
++
++		vdd = of_parse_phandle(cache, "vdd_dig-supply", 0);
++		if (vdd) {
++			krait_l2_reg = regulator_get(NULL, vdd->name);
++			if (IS_ERR(krait_l2_reg)) {
++				pr_warn("failed to get l2 vdd_dig supply\n");
++				krait_l2_reg = NULL;
++			}
++			of_node_put(vdd);
++		}
++
++		krait_l2_clk = of_clk_get(cache, 0);
++		if (!IS_ERR(krait_l2_clk)) {
++			ret = krait_parse_cache_points(&pdev->dev, cache);
++			if (ret)
++				clk_put(krait_l2_clk);
++		}
++		if (IS_ERR(krait_l2_clk) || ret)
++			krait_l2_clk = NULL;
++	}
++
++	for_each_possible_cpu(cpu) {
++		dev = get_cpu_device(cpu);
++		if (!dev) {
++			pr_err("failed to get krait device\n");
++			ret = -ENOENT;
++			goto out_free_table;
++		}
++		per_cpu(krait_cpu_clks, cpu) = clk = devm_clk_get(dev, NULL);
++		if (IS_ERR(clk)) {
++			ret = PTR_ERR(clk);
++			goto out_free_table;
++		}
++		core = devm_regulator_get(dev, "core");
++		if (IS_ERR(core)) {
++			pr_debug("failed to get core regulator\n");
++			ret = PTR_ERR(core);
++			goto out_free_table;
++		}
++		per_cpu(krait_supply_core, cpu) = core;
++
++		freq = freq_Hz = clk_get_rate(clk);
++
++		rcu_read_lock();
++		opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
++		if (IS_ERR(opp)) {
++			rcu_read_unlock();
++			pr_err("failed to find OPP for %ld\n", freq_Hz);
++			ret = PTR_ERR(opp);
++			goto out_free_table;
++		}
++		volt = dev_pm_opp_get_voltage(opp);
++		rcu_read_unlock();
++
++		tol = volt * voltage_tolerance / 100;
++		ret = regulator_set_voltage_tol(core, volt, tol);
++		if (ret) {
++			pr_err("failed to scale voltage up: %d\n", ret);
++			goto out_free_table;
++		}
++		ret = regulator_enable(core);
++		if (ret) {
++			pr_err("failed to enable regulator: %d\n", ret);
++			goto out_free_table;
++		}
++		max_cpu_freq = max(max_cpu_freq, freq);
++	}
++
++	for (i = 0; i < nr_krait_l2_points; i++) {
++		if (max_cpu_freq >= krait_l2_points[i].cpu_freq) {
++			if (krait_l2_reg) {
++				ret = regulator_set_voltage_tol(krait_l2_reg,
++						krait_l2_points[i].cache_volt,
++						tol);
++				if (ret)
++					pr_err("failed to scale l2 voltage: %d\n",
++							ret);
++				ret = regulator_enable(krait_l2_reg);
++				if (ret)
++					pr_err("failed to enable l2 voltage: %d\n",
++							ret);
++			}
++			break;
++		}
++
++	}
++
++	ret = cpufreq_register_driver(&krait_cpufreq_driver);
++	if (ret) {
++		pr_err("failed register driver: %d\n", ret);
++		goto out_free_table;
++	}
++	of_node_put(np);
++
++	/*
++	 * For now, just loading the cooling device;
++	 * thermal DT code takes care of matching them.
++	 */
++	for_each_possible_cpu(cpu) {
++		dev = get_cpu_device(cpu);
++		np = of_node_get(dev->of_node);
++		if (of_find_property(np, "#cooling-cells", NULL)) {
++			cdev = of_cpufreq_cooling_register(np, cpumask_of(cpu));
++			if (IS_ERR(cdev))
++				pr_err("running cpufreq without cooling device: %ld\n",
++				       PTR_ERR(cdev));
++		}
++		of_node_put(np);
++	}
++
++	return 0;
++
++out_free_table:
++	regulator_put(krait_l2_reg);
++	clk_put(krait_l2_clk);
++	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
++out_put_node:
++	of_node_put(np);
++	return ret;
++}
++
++static int krait_cpufreq_remove(struct platform_device *pdev)
++{
++	cpufreq_cooling_unregister(cdev);
++	cpufreq_unregister_driver(&krait_cpufreq_driver);
++	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
++	clk_put(krait_l2_clk);
++	regulator_put(krait_l2_reg);
++
++	return 0;
++}
++
++static struct platform_driver krait_cpufreq_platdrv = {
++	.driver = {
++		.name	= "cpufreq-krait",
++		.owner	= THIS_MODULE,
++	},
++	.probe		= krait_cpufreq_probe,
++	.remove		= krait_cpufreq_remove,
++};
++module_platform_driver(krait_cpufreq_platdrv);
++
++MODULE_DESCRIPTION("Krait CPUfreq driver");
++MODULE_LICENSE("GPL v2");
+--- a/drivers/cpufreq/qcom-cpufreq.c
++++ b/drivers/cpufreq/qcom-cpufreq.c
+@@ -168,11 +168,8 @@
+ 
+ static int __init qcom_cpufreq_driver_init(void)
+ {
+-	struct cpufreq_dt_platform_data pdata = { .independent_clocks = true };
+ 	struct platform_device_info devinfo = {
+-		.name = "cpufreq-dt",
+-		.data = &pdata,
+-		.size_data = sizeof(pdata),
++		.name = "cpufreq-krait",
+ 	};
+ 	struct device *cpu_dev;
+ 	struct device_node *np;