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, 294 insertions, 0 deletions

diff --git a/kernel/drivers/clk/qcom/clk-pll.c b/kernel/drivers/clk/qcom/clk-pll.c
new file mode 100644
index 000000000..245d5063a
--- /dev/null
+++ b/kernel/drivers/clk/qcom/clk-pll.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/bitops.h>
+#include <linux/err.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include <asm/div64.h>
+
+#include "clk-pll.h"
+
+#define PLL_OUTCTRL		BIT(0)
+#define PLL_BYPASSNL		BIT(1)
+#define PLL_RESET_N		BIT(2)
+#define PLL_LOCK_COUNT_SHIFT	8
+#define PLL_LOCK_COUNT_MASK	0x3f
+#define PLL_BIAS_COUNT_SHIFT	14
+#define PLL_BIAS_COUNT_MASK	0x3f
+#define PLL_VOTE_FSM_ENA	BIT(20)
+#define PLL_VOTE_FSM_RESET	BIT(21)
+
+static int clk_pll_enable(struct clk_hw *hw)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	int ret;
+	u32 mask, val;
+
+	mask = PLL_OUTCTRL | PLL_RESET_N | PLL_BYPASSNL;
+	ret = regmap_read(pll->clkr.regmap, pll->mode_reg, &val);
+	if (ret)
+		return ret;
+
+	/* Skip if already enabled or in FSM mode */
+	if ((val & mask) == mask || val & PLL_VOTE_FSM_ENA)
+		return 0;
+
+	/* Disable PLL bypass mode. */
+	ret = regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_BYPASSNL,
+				 PLL_BYPASSNL);
+	if (ret)
+		return ret;
+
+	/*
+	 * H/W requires a 5us delay between disabling the bypass and
+	 * de-asserting the reset. Delay 10us just to be safe.
+	 */
+	udelay(10);
+
+	/* De-assert active-low PLL reset. */
+	ret = regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_RESET_N,
+				 PLL_RESET_N);
+	if (ret)
+		return ret;
+
+	/* Wait until PLL is locked. */
+	udelay(50);
+
+	/* Enable PLL output. */
+	return regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_OUTCTRL,
+				 PLL_OUTCTRL);
+}
+
+static void clk_pll_disable(struct clk_hw *hw)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	u32 mask;
+	u32 val;
+
+	regmap_read(pll->clkr.regmap, pll->mode_reg, &val);
+	/* Skip if in FSM mode */
+	if (val & PLL_VOTE_FSM_ENA)
+		return;
+	mask = PLL_OUTCTRL | PLL_RESET_N | PLL_BYPASSNL;
+	regmap_update_bits(pll->clkr.regmap, pll->mode_reg, mask, 0);
+}
+
+static unsigned long
+clk_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	u32 l, m, n, config;
+	unsigned long rate;
+	u64 tmp;
+
+	regmap_read(pll->clkr.regmap, pll->l_reg, &l);
+	regmap_read(pll->clkr.regmap, pll->m_reg, &m);
+	regmap_read(pll->clkr.regmap, pll->n_reg, &n);
+
+	l &= 0x3ff;
+	m &= 0x7ffff;
+	n &= 0x7ffff;
+
+	rate = parent_rate * l;
+	if (n) {
+		tmp = parent_rate;
+		tmp *= m;
+		do_div(tmp, n);
+		rate += tmp;
+	}
+	if (pll->post_div_width) {
+		regmap_read(pll->clkr.regmap, pll->config_reg, &config);
+		config >>= pll->post_div_shift;
+		config &= BIT(pll->post_div_width) - 1;
+		rate /= config + 1;
+	}
+
+	return rate;
+}
+
+static const
+struct pll_freq_tbl *find_freq(const struct pll_freq_tbl *f, unsigned long rate)
+{
+	if (!f)
+		return NULL;
+
+	for (; f->freq; f++)
+		if (rate <= f->freq)
+			return f;
+
+	return NULL;
+}
+
+static long
+clk_pll_determine_rate(struct clk_hw *hw, unsigned long rate,
+		       unsigned long min_rate, unsigned long max_rate,
+		       unsigned long *p_rate, struct clk_hw **p)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	const struct pll_freq_tbl *f;
+
+	f = find_freq(pll->freq_tbl, rate);
+	if (!f)
+		return clk_pll_recalc_rate(hw, *p_rate);
+
+	return f->freq;
+}
+
+static int
+clk_pll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long p_rate)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	const struct pll_freq_tbl *f;
+	bool enabled;
+	u32 mode;
+	u32 enable_mask = PLL_OUTCTRL | PLL_BYPASSNL | PLL_RESET_N;
+
+	f = find_freq(pll->freq_tbl, rate);
+	if (!f)
+		return -EINVAL;
+
+	regmap_read(pll->clkr.regmap, pll->mode_reg, &mode);
+	enabled = (mode & enable_mask) == enable_mask;
+
+	if (enabled)
+		clk_pll_disable(hw);
+
+	regmap_update_bits(pll->clkr.regmap, pll->l_reg, 0x3ff, f->l);
+	regmap_update_bits(pll->clkr.regmap, pll->m_reg, 0x7ffff, f->m);
+	regmap_update_bits(pll->clkr.regmap, pll->n_reg, 0x7ffff, f->n);
+	regmap_write(pll->clkr.regmap, pll->config_reg, f->ibits);
+
+	if (enabled)
+		clk_pll_enable(hw);
+
+	return 0;
+}
+
+const struct clk_ops clk_pll_ops = {
+	.enable = clk_pll_enable,
+	.disable = clk_pll_disable,
+	.recalc_rate = clk_pll_recalc_rate,
+	.determine_rate = clk_pll_determine_rate,
+	.set_rate = clk_pll_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_pll_ops);
+
+static int wait_for_pll(struct clk_pll *pll)
+{
+	u32 val;
+	int count;
+	int ret;
+	const char *name = __clk_get_name(pll->clkr.hw.clk);
+
+	/* Wait for pll to enable. */
+	for (count = 200; count > 0; count--) {
+		ret = regmap_read(pll->clkr.regmap, pll->status_reg, &val);
+		if (ret)
+			return ret;
+		if (val & BIT(pll->status_bit))
+			return 0;
+		udelay(1);
+	}
+
+	WARN(1, "%s didn't enable after voting for it!\n", name);
+	return -ETIMEDOUT;
+}
+
+static int clk_pll_vote_enable(struct clk_hw *hw)
+{
+	int ret;
+	struct clk_pll *p = to_clk_pll(__clk_get_hw(__clk_get_parent(hw->clk)));
+
+	ret = clk_enable_regmap(hw);
+	if (ret)
+		return ret;
+
+	return wait_for_pll(p);
+}
+
+const struct clk_ops clk_pll_vote_ops = {
+	.enable = clk_pll_vote_enable,
+	.disable = clk_disable_regmap,
+};
+EXPORT_SYMBOL_GPL(clk_pll_vote_ops);
+
+static void
+clk_pll_set_fsm_mode(struct clk_pll *pll, struct regmap *regmap, u8 lock_count)
+{
+	u32 val;
+	u32 mask;
+
+	/* De-assert reset to FSM */
+	regmap_update_bits(regmap, pll->mode_reg, PLL_VOTE_FSM_RESET, 0);
+
+	/* Program bias count and lock count */
+	val = 1 << PLL_BIAS_COUNT_SHIFT | lock_count << PLL_LOCK_COUNT_SHIFT;
+	mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
+	mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
+	regmap_update_bits(regmap, pll->mode_reg, mask, val);
+
+	/* Enable PLL FSM voting */
+	regmap_update_bits(regmap, pll->mode_reg, PLL_VOTE_FSM_ENA,
+		PLL_VOTE_FSM_ENA);
+}
+
+static void clk_pll_configure(struct clk_pll *pll, struct regmap *regmap,
+	const struct pll_config *config)
+{
+	u32 val;
+	u32 mask;
+
+	regmap_write(regmap, pll->l_reg, config->l);
+	regmap_write(regmap, pll->m_reg, config->m);
+	regmap_write(regmap, pll->n_reg, config->n);
+
+	val = config->vco_val;
+	val |= config->pre_div_val;
+	val |= config->post_div_val;
+	val |= config->mn_ena_mask;
+	val |= config->main_output_mask;
+	val |= config->aux_output_mask;
+
+	mask = config->vco_mask;
+	mask |= config->pre_div_mask;
+	mask |= config->post_div_mask;
+	mask |= config->mn_ena_mask;
+	mask |= config->main_output_mask;
+	mask |= config->aux_output_mask;
+
+	regmap_update_bits(regmap, pll->config_reg, mask, val);
+}
+
+void clk_pll_configure_sr(struct clk_pll *pll, struct regmap *regmap,
+		const struct pll_config *config, bool fsm_mode)
+{
+	clk_pll_configure(pll, regmap, config);
+	if (fsm_mode)
+		clk_pll_set_fsm_mode(pll, regmap, 8);
+}
+EXPORT_SYMBOL_GPL(clk_pll_configure_sr);
+
+void clk_pll_configure_sr_hpm_lp(struct clk_pll *pll, struct regmap *regmap,
+		const struct pll_config *config, bool fsm_mode)
+{
+	clk_pll_configure(pll, regmap, config);
+	if (fsm_mode)
+		clk_pll_set_fsm_mode(pll, regmap, 0);
+}
+EXPORT_SYMBOL_GPL(clk_pll_configure_sr_hpm_lp);