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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42334 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 255 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch b/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch
new file mode 100644
index 0000000000..3150a4dfb8
--- /dev/null
+++ b/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch
@@ -0,0 +1,255 @@
+From 5cf343c60d7557aefb468603065cac5062f11b8d Mon Sep 17 00:00:00 2001
+From: Stephen Boyd <sboyd@codeaurora.org>
+Date: Fri, 30 May 2014 16:36:11 -0700
+Subject: [PATCH 172/182] 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
+
+diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
+index 4b029c0..4051528 100644
+--- a/drivers/cpufreq/Kconfig
++++ b/drivers/cpufreq/Kconfig
+@@ -194,6 +194,19 @@ config GENERIC_CPUFREQ_CPU0
+ 
+ 	  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.
++
+ menu "x86 CPU frequency scaling drivers"
+ depends on X86
+ source "drivers/cpufreq/Kconfig.x86"
+diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
+index 7494565..f6f4485 100644
+--- a/drivers/cpufreq/Makefile
++++ b/drivers/cpufreq/Makefile
+@@ -12,6 +12,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)	+= cpufreq_conservative.o
+ obj-$(CONFIG_CPU_FREQ_GOV_COMMON)		+= cpufreq_governor.o
+ 
+ obj-$(CONFIG_GENERIC_CPUFREQ_CPU0)	+= cpufreq-cpu0.o
++obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT)	+= cpufreq-krait.o
+ 
+ ##################################################################################
+ # x86 drivers.
+diff --git a/drivers/cpufreq/cpufreq-krait.c b/drivers/cpufreq/cpufreq-krait.c
+new file mode 100644
+index 0000000..7b38b9c
+--- /dev/null
++++ b/drivers/cpufreq/cpufreq-krait.c
+@@ -0,0 +1,190 @@
++/*
++ * 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/slab.h>
++#include <linux/thermal.h>
++
++static unsigned int transition_latency;
++
++static struct device *cpu_dev;
++static DEFINE_PER_CPU(struct clk *, krait_cpu_clks);
++static struct cpufreq_frequency_table *freq_table;
++static struct thermal_cooling_device *cdev;
++
++static int krait_set_target(struct cpufreq_policy *policy, unsigned int index)
++{
++	unsigned long volt = 0, volt_old = 0;
++	unsigned int old_freq, new_freq;
++	long freq_Hz, freq_exact;
++	int ret;
++	struct clk *cpu_clk;
++
++	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;
++
++	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);
++
++	ret = clk_set_rate(cpu_clk, freq_exact);
++	if (ret)
++		pr_err("failed to set clock rate: %d\n", ret);
++
++	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;
++	int ret;
++	unsigned int cpu;
++	struct device *dev;
++	struct clk *clk;
++
++	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;
++	}
++
++	for_each_possible_cpu(cpu) {
++		dev = get_cpu_device(cpu);
++		if (!dev) {
++			pr_err("failed to get krait device\n");
++			ret = -ENOENT;
++			goto out_put_node;
++		}
++		per_cpu(krait_cpu_clks, cpu) = clk = devm_clk_get(dev, NULL);
++		if (IS_ERR(clk)) {
++			ret = PTR_ERR(clk);
++			goto out_put_node;
++		}
++	}
++
++	ret = of_init_opp_table(cpu_dev);
++	if (ret) {
++		pr_err("failed to init OPP table: %d\n", ret);
++		goto out_put_node;
++	}
++
++	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;
++	}
++
++	if (of_property_read_u32(np, "clock-latency", &transition_latency))
++		transition_latency = CPUFREQ_ETERNAL;
++
++	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:
++	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);
++
++	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");
+-- 
+1.7.10.4
+