Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 362 insertions, 0 deletions

diff --git a/kernel/drivers/clk/clk-qoriq.c b/kernel/drivers/clk/clk-qoriq.c
new file mode 100644
index 000000000..cda90a971
--- /dev/null
+++ b/kernel/drivers/clk/clk-qoriq.c
@@ -0,0 +1,362 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ *
+ * clock driver for Freescale QorIQ SoCs.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+struct cmux_clk {
+	struct clk_hw hw;
+	void __iomem *reg;
+	unsigned int clk_per_pll;
+	u32 flags;
+};
+
+#define PLL_KILL			BIT(31)
+#define	CLKSEL_SHIFT		27
+#define CLKSEL_ADJUST		BIT(0)
+#define to_cmux_clk(p)		container_of(p, struct cmux_clk, hw)
+
+static int cmux_set_parent(struct clk_hw *hw, u8 idx)
+{
+	struct cmux_clk *clk = to_cmux_clk(hw);
+	u32 clksel;
+
+	clksel = ((idx / clk->clk_per_pll) << 2) + idx % clk->clk_per_pll;
+	if (clk->flags & CLKSEL_ADJUST)
+		clksel += 8;
+	clksel = (clksel & 0xf) << CLKSEL_SHIFT;
+	iowrite32be(clksel, clk->reg);
+
+	return 0;
+}
+
+static u8 cmux_get_parent(struct clk_hw *hw)
+{
+	struct cmux_clk *clk = to_cmux_clk(hw);
+	u32 clksel;
+
+	clksel = ioread32be(clk->reg);
+	clksel = (clksel >> CLKSEL_SHIFT) & 0xf;
+	if (clk->flags & CLKSEL_ADJUST)
+		clksel -= 8;
+	clksel = (clksel >> 2) * clk->clk_per_pll + clksel % 4;
+
+	return clksel;
+}
+
+static const struct clk_ops cmux_ops = {
+	.get_parent = cmux_get_parent,
+	.set_parent = cmux_set_parent,
+};
+
+static void __init core_mux_init(struct device_node *np)
+{
+	struct clk *clk;
+	struct clk_init_data init;
+	struct cmux_clk *cmux_clk;
+	struct device_node *node;
+	int rc, count, i;
+	u32	offset;
+	const char *clk_name;
+	const char **parent_names;
+	struct of_phandle_args clkspec;
+
+	rc = of_property_read_u32(np, "reg", &offset);
+	if (rc) {
+		pr_err("%s: could not get reg property\n", np->name);
+		return;
+	}
+
+	/* get the input clock source count */
+	count = of_property_count_strings(np, "clock-names");
+	if (count < 0) {
+		pr_err("%s: get clock count error\n", np->name);
+		return;
+	}
+	parent_names = kcalloc(count, sizeof(char *), GFP_KERNEL);
+	if (!parent_names)
+		return;
+
+	for (i = 0; i < count; i++)
+		parent_names[i] = of_clk_get_parent_name(np, i);
+
+	cmux_clk = kzalloc(sizeof(*cmux_clk), GFP_KERNEL);
+	if (!cmux_clk)
+		goto err_name;
+
+	cmux_clk->reg = of_iomap(np, 0);
+	if (!cmux_clk->reg) {
+		pr_err("%s: could not map register\n", __func__);
+		goto err_clk;
+	}
+
+	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", 0,
+					&clkspec);
+	if (rc) {
+		pr_err("%s: parse clock node error\n", __func__);
+		goto err_clk;
+	}
+
+	cmux_clk->clk_per_pll = of_property_count_strings(clkspec.np,
+			"clock-output-names");
+	of_node_put(clkspec.np);
+
+	node = of_find_compatible_node(NULL, NULL, "fsl,p4080-clockgen");
+	if (node && (offset >= 0x80))
+		cmux_clk->flags = CLKSEL_ADJUST;
+
+	rc = of_property_read_string_index(np, "clock-output-names",
+					   0, &clk_name);
+	if (rc) {
+		pr_err("%s: read clock names error\n", np->name);
+		goto err_clk;
+	}
+
+	init.name = clk_name;
+	init.ops = &cmux_ops;
+	init.parent_names = parent_names;
+	init.num_parents = count;
+	init.flags = 0;
+	cmux_clk->hw.init = &init;
+
+	clk = clk_register(NULL, &cmux_clk->hw);
+	if (IS_ERR(clk)) {
+		pr_err("%s: could not register clock\n", clk_name);
+		goto err_clk;
+	}
+
+	rc = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+	if (rc) {
+		pr_err("Could not register clock provider for node:%s\n",
+		       np->name);
+		goto err_clk;
+	}
+	goto err_name;
+
+err_clk:
+	kfree(cmux_clk);
+err_name:
+	/* free *_names because they are reallocated when registered */
+	kfree(parent_names);
+}
+
+static void __init core_pll_init(struct device_node *np)
+{
+	u32 mult;
+	int i, rc, count;
+	const char *clk_name, *parent_name;
+	struct clk_onecell_data *onecell_data;
+	struct clk      **subclks;
+	void __iomem *base;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_err("iomap error\n");
+		return;
+	}
+
+	/* get the multiple of PLL */
+	mult = ioread32be(base);
+
+	/* check if this PLL is disabled */
+	if (mult & PLL_KILL) {
+		pr_debug("PLL:%s is disabled\n", np->name);
+		goto err_map;
+	}
+	mult = (mult >> 1) & 0x3f;
+
+	parent_name = of_clk_get_parent_name(np, 0);
+	if (!parent_name) {
+		pr_err("PLL: %s must have a parent\n", np->name);
+		goto err_map;
+	}
+
+	count = of_property_count_strings(np, "clock-output-names");
+	if (count < 0 || count > 4) {
+		pr_err("%s: clock is not supported\n", np->name);
+		goto err_map;
+	}
+
+	subclks = kcalloc(count, sizeof(struct clk *), GFP_KERNEL);
+	if (!subclks)
+		goto err_map;
+
+	onecell_data = kmalloc(sizeof(*onecell_data), GFP_KERNEL);
+	if (!onecell_data)
+		goto err_clks;
+
+	for (i = 0; i < count; i++) {
+		rc = of_property_read_string_index(np, "clock-output-names",
+						   i, &clk_name);
+		if (rc) {
+			pr_err("%s: could not get clock names\n", np->name);
+			goto err_cell;
+		}
+
+		/*
+		 * when count == 4, there are 4 output clocks:
+		 * /1, /2, /3, /4 respectively
+		 * when count < 4, there are at least 2 output clocks:
+		 * /1, /2, (/4, if count == 3) respectively.
+		 */
+		if (count == 4)
+			subclks[i] = clk_register_fixed_factor(NULL, clk_name,
+					parent_name, 0, mult, 1 + i);
+		else
+
+			subclks[i] = clk_register_fixed_factor(NULL, clk_name,
+					parent_name, 0, mult, 1 << i);
+
+		if (IS_ERR(subclks[i])) {
+			pr_err("%s: could not register clock\n", clk_name);
+			goto err_cell;
+		}
+	}
+
+	onecell_data->clks = subclks;
+	onecell_data->clk_num = count;
+
+	rc = of_clk_add_provider(np, of_clk_src_onecell_get, onecell_data);
+	if (rc) {
+		pr_err("Could not register clk provider for node:%s\n",
+		       np->name);
+		goto err_cell;
+	}
+
+	iounmap(base);
+	return;
+err_cell:
+	kfree(onecell_data);
+err_clks:
+	kfree(subclks);
+err_map:
+	iounmap(base);
+}
+
+static void __init sysclk_init(struct device_node *node)
+{
+	struct clk *clk;
+	const char *clk_name = node->name;
+	struct device_node *np = of_get_parent(node);
+	u32 rate;
+
+	if (!np) {
+		pr_err("could not get parent node\n");
+		return;
+	}
+
+	if (of_property_read_u32(np, "clock-frequency", &rate)) {
+		of_node_put(node);
+		return;
+	}
+
+	of_property_read_string(np, "clock-output-names", &clk_name);
+
+	clk = clk_register_fixed_rate(NULL, clk_name, NULL, CLK_IS_ROOT, rate);
+	if (!IS_ERR(clk))
+		of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static void __init pltfrm_pll_init(struct device_node *np)
+{
+	void __iomem *base;
+	uint32_t mult;
+	const char *parent_name, *clk_name;
+	int i, _errno;
+	struct clk_onecell_data *cod;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_err("%s(): %s: of_iomap() failed\n", __func__, np->name);
+		return;
+	}
+
+	/* Get the multiple of PLL */
+	mult = ioread32be(base);
+
+	iounmap(base);
+
+	/* Check if this PLL is disabled */
+	if (mult & PLL_KILL) {
+		pr_debug("%s(): %s: Disabled\n", __func__, np->name);
+		return;
+	}
+	mult = (mult & GENMASK(6, 1)) >> 1;
+
+	parent_name = of_clk_get_parent_name(np, 0);
+	if (!parent_name) {
+		pr_err("%s(): %s: of_clk_get_parent_name() failed\n",
+		       __func__, np->name);
+		return;
+	}
+
+	i = of_property_count_strings(np, "clock-output-names");
+	if (i < 0) {
+		pr_err("%s(): %s: of_property_count_strings(clock-output-names) = %d\n",
+		       __func__, np->name, i);
+		return;
+	}
+
+	cod = kmalloc(sizeof(*cod) + i * sizeof(struct clk *), GFP_KERNEL);
+	if (!cod)
+		return;
+	cod->clks = (struct clk **)(cod + 1);
+	cod->clk_num = i;
+
+	for (i = 0; i < cod->clk_num; i++) {
+		_errno = of_property_read_string_index(np, "clock-output-names",
+						       i, &clk_name);
+		if (_errno < 0) {
+			pr_err("%s(): %s: of_property_read_string_index(clock-output-names) = %d\n",
+			       __func__, np->name, _errno);
+			goto return_clk_unregister;
+		}
+
+		cod->clks[i] = clk_register_fixed_factor(NULL, clk_name,
+					       parent_name, 0, mult, 1 + i);
+		if (IS_ERR(cod->clks[i])) {
+			pr_err("%s(): %s: clk_register_fixed_factor(%s) = %ld\n",
+			       __func__, np->name,
+			       clk_name, PTR_ERR(cod->clks[i]));
+			goto return_clk_unregister;
+		}
+	}
+
+	_errno = of_clk_add_provider(np, of_clk_src_onecell_get, cod);
+	if (_errno < 0) {
+		pr_err("%s(): %s: of_clk_add_provider() = %d\n",
+		       __func__, np->name, _errno);
+		goto return_clk_unregister;
+	}
+
+	return;
+
+return_clk_unregister:
+	while (--i >= 0)
+		clk_unregister(cod->clks[i]);
+	kfree(cod);
+}
+
+CLK_OF_DECLARE(qoriq_sysclk_1, "fsl,qoriq-sysclk-1.0", sysclk_init);
+CLK_OF_DECLARE(qoriq_sysclk_2, "fsl,qoriq-sysclk-2.0", sysclk_init);
+CLK_OF_DECLARE(qoriq_core_pll_1, "fsl,qoriq-core-pll-1.0", core_pll_init);
+CLK_OF_DECLARE(qoriq_core_pll_2, "fsl,qoriq-core-pll-2.0", core_pll_init);
+CLK_OF_DECLARE(qoriq_core_mux_1, "fsl,qoriq-core-mux-1.0", core_mux_init);
+CLK_OF_DECLARE(qoriq_core_mux_2, "fsl,qoriq-core-mux-2.0", core_mux_init);
+CLK_OF_DECLARE(qoriq_pltfrm_pll_1, "fsl,qoriq-platform-pll-1.0", pltfrm_pll_init);
+CLK_OF_DECLARE(qoriq_pltfrm_pll_2, "fsl,qoriq-platform-pll-2.0", pltfrm_pll_init);