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, 490 insertions, 0 deletions

diff --git a/kernel/arch/mips/ath79/clock.c b/kernel/arch/mips/ath79/clock.c
new file mode 100644
index 000000000..26479f437
--- /dev/null
+++ b/kernel/arch/mips/ath79/clock.c
@@ -0,0 +1,490 @@
+/*
+ *  Atheros AR71XX/AR724X/AR913X common routines
+ *
+ *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
+ *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
+ *
+ *  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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+
+#include <asm/div64.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include "common.h"
+
+#define AR71XX_BASE_FREQ	40000000
+#define AR724X_BASE_FREQ	5000000
+#define AR913X_BASE_FREQ	5000000
+
+struct clk {
+	unsigned long rate;
+};
+
+static void __init ath79_add_sys_clkdev(const char *id, unsigned long rate)
+{
+	struct clk *clk;
+	int err;
+
+	clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+	if (!clk)
+		panic("failed to allocate %s clock structure", id);
+
+	clk->rate = rate;
+
+	err = clk_register_clkdev(clk, id, NULL);
+	if (err)
+		panic("unable to register %s clock device", id);
+}
+
+static void __init ar71xx_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 pll;
+	u32 freq;
+	u32 div;
+
+	ref_rate = AR71XX_BASE_FREQ;
+
+	pll = ath79_pll_rr(AR71XX_PLL_REG_CPU_CONFIG);
+
+	div = ((pll >> AR71XX_PLL_DIV_SHIFT) & AR71XX_PLL_DIV_MASK) + 1;
+	freq = div * ref_rate;
+
+	div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
+	cpu_rate = freq / div;
+
+	div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1;
+	ddr_rate = freq / div;
+
+	div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
+	ahb_rate = cpu_rate / div;
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ahb", NULL);
+	clk_add_alias("uart", NULL, "ahb", NULL);
+}
+
+static void __init ar724x_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 pll;
+	u32 freq;
+	u32 div;
+
+	ref_rate = AR724X_BASE_FREQ;
+	pll = ath79_pll_rr(AR724X_PLL_REG_CPU_CONFIG);
+
+	div = ((pll >> AR724X_PLL_DIV_SHIFT) & AR724X_PLL_DIV_MASK);
+	freq = div * ref_rate;
+
+	div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK);
+	freq *= div;
+
+	cpu_rate = freq;
+
+	div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
+	ddr_rate = freq / div;
+
+	div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
+	ahb_rate = cpu_rate / div;
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ahb", NULL);
+	clk_add_alias("uart", NULL, "ahb", NULL);
+}
+
+static void __init ar913x_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 pll;
+	u32 freq;
+	u32 div;
+
+	ref_rate = AR913X_BASE_FREQ;
+	pll = ath79_pll_rr(AR913X_PLL_REG_CPU_CONFIG);
+
+	div = ((pll >> AR913X_PLL_DIV_SHIFT) & AR913X_PLL_DIV_MASK);
+	freq = div * ref_rate;
+
+	cpu_rate = freq;
+
+	div = ((pll >> AR913X_DDR_DIV_SHIFT) & AR913X_DDR_DIV_MASK) + 1;
+	ddr_rate = freq / div;
+
+	div = (((pll >> AR913X_AHB_DIV_SHIFT) & AR913X_AHB_DIV_MASK) + 1) * 2;
+	ahb_rate = cpu_rate / div;
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ahb", NULL);
+	clk_add_alias("uart", NULL, "ahb", NULL);
+}
+
+static void __init ar933x_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 clock_ctrl;
+	u32 cpu_config;
+	u32 freq;
+	u32 t;
+
+	t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
+	if (t & AR933X_BOOTSTRAP_REF_CLK_40)
+		ref_rate = (40 * 1000 * 1000);
+	else
+		ref_rate = (25 * 1000 * 1000);
+
+	clock_ctrl = ath79_pll_rr(AR933X_PLL_CLOCK_CTRL_REG);
+	if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) {
+		cpu_rate = ref_rate;
+		ahb_rate = ref_rate;
+		ddr_rate = ref_rate;
+	} else {
+		cpu_config = ath79_pll_rr(AR933X_PLL_CPU_CONFIG_REG);
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
+		freq = ref_rate / t;
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_NINT_MASK;
+		freq *= t;
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
+		if (t == 0)
+			t = 1;
+
+		freq >>= t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT) &
+		     AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK) + 1;
+		cpu_rate = freq / t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) &
+		      AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1;
+		ddr_rate = freq / t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) &
+		     AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1;
+		ahb_rate = freq / t;
+	}
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ahb", NULL);
+	clk_add_alias("uart", NULL, "ref", NULL);
+}
+
+static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac,
+				      u32 frac, u32 out_div)
+{
+	u64 t;
+	u32 ret;
+
+	t = ref;
+	t *= nint;
+	do_div(t, ref_div);
+	ret = t;
+
+	t = ref;
+	t *= nfrac;
+	do_div(t, ref_div * frac);
+	ret += t;
+
+	ret /= (1 << out_div);
+	return ret;
+}
+
+static void __init ar934x_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv;
+	u32 cpu_pll, ddr_pll;
+	u32 bootstrap;
+	void __iomem *dpll_base;
+
+	dpll_base = ioremap(AR934X_SRIF_BASE, AR934X_SRIF_SIZE);
+
+	bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
+	if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
+		ref_rate = 40 * 1000 * 1000;
+	else
+		ref_rate = 25 * 1000 * 1000;
+
+	pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG);
+	if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
+		out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
+			  AR934X_SRIF_DPLL2_OUTDIV_MASK;
+		pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL1_REG);
+		nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
+		       AR934X_SRIF_DPLL1_NINT_MASK;
+		nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
+		ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
+			  AR934X_SRIF_DPLL1_REFDIV_MASK;
+		frac = 1 << 18;
+	} else {
+		pll = ath79_pll_rr(AR934X_PLL_CPU_CONFIG_REG);
+		out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+			AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
+		ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+			  AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
+		nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
+		       AR934X_PLL_CPU_CONFIG_NINT_MASK;
+		nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
+			AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
+		frac = 1 << 6;
+	}
+
+	cpu_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
+				      nfrac, frac, out_div);
+
+	pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL2_REG);
+	if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
+		out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
+			  AR934X_SRIF_DPLL2_OUTDIV_MASK;
+		pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL1_REG);
+		nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
+		       AR934X_SRIF_DPLL1_NINT_MASK;
+		nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
+		ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
+			  AR934X_SRIF_DPLL1_REFDIV_MASK;
+		frac = 1 << 18;
+	} else {
+		pll = ath79_pll_rr(AR934X_PLL_DDR_CONFIG_REG);
+		out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
+			  AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
+		ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
+			   AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
+		nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
+		       AR934X_PLL_DDR_CONFIG_NINT_MASK;
+		nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
+			AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
+		frac = 1 << 10;
+	}
+
+	ddr_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
+				      nfrac, frac, out_div);
+
+	clk_ctrl = ath79_pll_rr(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
+
+	postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) &
+		  AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK;
+
+	if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS)
+		cpu_rate = ref_rate;
+	else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
+		cpu_rate = cpu_pll / (postdiv + 1);
+	else
+		cpu_rate = ddr_pll / (postdiv + 1);
+
+	postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) &
+		  AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK;
+
+	if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS)
+		ddr_rate = ref_rate;
+	else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
+		ddr_rate = ddr_pll / (postdiv + 1);
+	else
+		ddr_rate = cpu_pll / (postdiv + 1);
+
+	postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) &
+		  AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK;
+
+	if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS)
+		ahb_rate = ref_rate;
+	else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
+		ahb_rate = ddr_pll / (postdiv + 1);
+	else
+		ahb_rate = cpu_pll / (postdiv + 1);
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ref", NULL);
+	clk_add_alias("uart", NULL, "ref", NULL);
+
+	iounmap(dpll_base);
+}
+
+static void __init qca955x_clocks_init(void)
+{
+	unsigned long ref_rate;
+	unsigned long cpu_rate;
+	unsigned long ddr_rate;
+	unsigned long ahb_rate;
+	u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
+	u32 cpu_pll, ddr_pll;
+	u32 bootstrap;
+
+	bootstrap = ath79_reset_rr(QCA955X_RESET_REG_BOOTSTRAP);
+	if (bootstrap &	QCA955X_BOOTSTRAP_REF_CLK_40)
+		ref_rate = 40 * 1000 * 1000;
+	else
+		ref_rate = 25 * 1000 * 1000;
+
+	pll = ath79_pll_rr(QCA955X_PLL_CPU_CONFIG_REG);
+	out_div = (pll >> QCA955X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+		  QCA955X_PLL_CPU_CONFIG_OUTDIV_MASK;
+	ref_div = (pll >> QCA955X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+		  QCA955X_PLL_CPU_CONFIG_REFDIV_MASK;
+	nint = (pll >> QCA955X_PLL_CPU_CONFIG_NINT_SHIFT) &
+	       QCA955X_PLL_CPU_CONFIG_NINT_MASK;
+	frac = (pll >> QCA955X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
+	       QCA955X_PLL_CPU_CONFIG_NFRAC_MASK;
+
+	cpu_pll = nint * ref_rate / ref_div;
+	cpu_pll += frac * ref_rate / (ref_div * (1 << 6));
+	cpu_pll /= (1 << out_div);
+
+	pll = ath79_pll_rr(QCA955X_PLL_DDR_CONFIG_REG);
+	out_div = (pll >> QCA955X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
+		  QCA955X_PLL_DDR_CONFIG_OUTDIV_MASK;
+	ref_div = (pll >> QCA955X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
+		  QCA955X_PLL_DDR_CONFIG_REFDIV_MASK;
+	nint = (pll >> QCA955X_PLL_DDR_CONFIG_NINT_SHIFT) &
+	       QCA955X_PLL_DDR_CONFIG_NINT_MASK;
+	frac = (pll >> QCA955X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
+	       QCA955X_PLL_DDR_CONFIG_NFRAC_MASK;
+
+	ddr_pll = nint * ref_rate / ref_div;
+	ddr_pll += frac * ref_rate / (ref_div * (1 << 10));
+	ddr_pll /= (1 << out_div);
+
+	clk_ctrl = ath79_pll_rr(QCA955X_PLL_CLK_CTRL_REG);
+
+	postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
+		  QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
+
+	if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
+		cpu_rate = ref_rate;
+	else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
+		cpu_rate = ddr_pll / (postdiv + 1);
+	else
+		cpu_rate = cpu_pll / (postdiv + 1);
+
+	postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
+		  QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
+
+	if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
+		ddr_rate = ref_rate;
+	else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
+		ddr_rate = cpu_pll / (postdiv + 1);
+	else
+		ddr_rate = ddr_pll / (postdiv + 1);
+
+	postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
+		  QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
+
+	if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
+		ahb_rate = ref_rate;
+	else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
+		ahb_rate = ddr_pll / (postdiv + 1);
+	else
+		ahb_rate = cpu_pll / (postdiv + 1);
+
+	ath79_add_sys_clkdev("ref", ref_rate);
+	ath79_add_sys_clkdev("cpu", cpu_rate);
+	ath79_add_sys_clkdev("ddr", ddr_rate);
+	ath79_add_sys_clkdev("ahb", ahb_rate);
+
+	clk_add_alias("wdt", NULL, "ref", NULL);
+	clk_add_alias("uart", NULL, "ref", NULL);
+}
+
+void __init ath79_clocks_init(void)
+{
+	if (soc_is_ar71xx())
+		ar71xx_clocks_init();
+	else if (soc_is_ar724x())
+		ar724x_clocks_init();
+	else if (soc_is_ar913x())
+		ar913x_clocks_init();
+	else if (soc_is_ar933x())
+		ar933x_clocks_init();
+	else if (soc_is_ar934x())
+		ar934x_clocks_init();
+	else if (soc_is_qca955x())
+		qca955x_clocks_init();
+	else
+		BUG();
+}
+
+unsigned long __init
+ath79_get_sys_clk_rate(const char *id)
+{
+	struct clk *clk;
+	unsigned long rate;
+
+	clk = clk_get(NULL, id);
+	if (IS_ERR(clk))
+		panic("unable to get %s clock, err=%d", id, (int) PTR_ERR(clk));
+
+	rate = clk_get_rate(clk);
+	clk_put(clk);
+
+	return rate;
+}
+
+/*
+ * Linux clock API
+ */
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);