clk: tegra: add Tegra specific clocks

Add Tegra specific clocks, pll, pll_out, peripheral, frac_divider, super.
Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
[swarren: alloc sizeof(*foo) not sizeof(struct foo), add comments re:
storing pointers to stack variables, make a timeout loop more idiomatic,
use _clk_pll_disable() not clk_disable_pll() from _program_pll() to
avoid redundant lock operations, unified tegra_clk_periph() and
tegra_clk_periph_nodiv(), unified tegra_clk_pll{,e}, rename all clock
registration functions so they don't have the same name as the clock
structs, return -EINVAL from clk_plle_enable when matching table rate
not found, pass ops to _tegra_clk_register_pll rather than a bool.]
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

drivers/clk/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_ARCH_U8500)	+= ux500/
 obj-$(CONFIG_ARCH_VT8500)	+= clk-vt8500.o
 obj-$(CONFIG_ARCH_SUNXI)	+= clk-sunxi.o
 obj-$(CONFIG_ARCH_ZYNQ)		+= clk-zynq.o
+obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 
 # Chip specific
 obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o

drivers/clk/tegra/Makefile

+obj-y					+= clk.o
+obj-y					+= clk-audio-sync.o
+obj-y					+= clk-divider.o
+obj-y					+= clk-periph.o
+obj-y					+= clk-periph-gate.o
+obj-y					+= clk-pll.o
+obj-y					+= clk-pll-out.o
+obj-y					+= clk-super.o

drivers/clk/tegra/clk-audio-sync.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+	return sync->rate;
+}
+
+static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long *prate)
+{
+	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+	if (rate > sync->max_rate)
+		return -EINVAL;
+	else
+		return rate;
+}
+
+static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+	sync->rate = rate;
+	return 0;
+}
+
+const struct clk_ops tegra_clk_sync_source_ops = {
+	.round_rate = clk_sync_source_round_rate,
+	.set_rate = clk_sync_source_set_rate,
+	.recalc_rate = clk_sync_source_recalc_rate,
+};
+
+struct clk *tegra_clk_register_sync_source(const char *name,
+		unsigned long rate, unsigned long max_rate)
+{
+	struct tegra_clk_sync_source *sync;
+	struct clk_init_data init;
+	struct clk *clk;
+
+	sync = kzalloc(sizeof(*sync), GFP_KERNEL);
+	if (!sync) {
+		pr_err("%s: could not allocate sync source clk\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	sync->rate = rate;
+	sync->max_rate = max_rate;
+
+	init.ops = &tegra_clk_sync_source_ops;
+	init.name = name;
+	init.flags = CLK_IS_ROOT;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	sync->hw.init = &init;
+
+	clk = clk_register(NULL, &sync->hw);
+	if (IS_ERR(clk))
+		kfree(sync);
+
+	return clk;
+}

drivers/clk/tegra/clk-divider.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+
+#include "clk.h"
+
+#define pll_out_override(p) (BIT((p->shift - 6)))
+#define div_mask(d) ((1 << (d->width)) - 1)
+#define get_mul(d) (1 << d->frac_width)
+#define get_max_div(d) div_mask(d)
+
+#define PERIPH_CLK_UART_DIV_ENB BIT(24)
+
+static int get_div(struct tegra_clk_frac_div *divider, unsigned long rate,
+		   unsigned long parent_rate)
+{
+	s64 divider_ux1 = parent_rate;
+	u8 flags = divider->flags;
+	int mul;
+
+	if (!rate)
+		return 0;
+
+	mul = get_mul(divider);
+
+	if (!(flags & TEGRA_DIVIDER_INT))
+		divider_ux1 *= mul;
+
+	if (flags & TEGRA_DIVIDER_ROUND_UP)
+		divider_ux1 += rate - 1;
+
+	do_div(divider_ux1, rate);
+
+	if (flags & TEGRA_DIVIDER_INT)
+		divider_ux1 *= mul;
+
+	divider_ux1 -= mul;
+
+	if (divider_ux1 < 0)
+		return 0;
+
+	if (divider_ux1 > get_max_div(divider))
+		return -EINVAL;
+
+	return divider_ux1;
+}
+
+static unsigned long clk_frac_div_recalc_rate(struct clk_hw *hw,
+					     unsigned long parent_rate)
+{
+	struct tegra_clk_frac_div *divider = to_clk_frac_div(hw);
+	u32 reg;
+	int div, mul;
+	u64 rate = parent_rate;
+
+	reg = readl_relaxed(divider->reg) >> divider->shift;
+	div = reg & div_mask(divider);
+
+	mul = get_mul(divider);
+	div += mul;
+
+	rate *= mul;
+	rate += div - 1;
+	do_div(rate, div);
+
+	return rate;
+}
+
+static long clk_frac_div_round_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long *prate)
+{
+	struct tegra_clk_frac_div *divider = to_clk_frac_div(hw);
+	int div, mul;
+	unsigned long output_rate = *prate;
+
+	if (!rate)
+		return output_rate;
+
+	div = get_div(divider, rate, output_rate);
+	if (div < 0)
+		return *prate;
+
+	mul = get_mul(divider);
+
+	return DIV_ROUND_UP(output_rate * mul, div + mul);
+}
+
+static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct tegra_clk_frac_div *divider = to_clk_frac_div(hw);
+	int div;
+	unsigned long flags = 0;
+	u32 val;
+
+	div = get_div(divider, rate, parent_rate);
+	if (div < 0)
+		return div;
+
+	if (divider->lock)
+		spin_lock_irqsave(divider->lock, flags);
+
+	val = readl_relaxed(divider->reg);
+	val &= ~(div_mask(divider) << divider->shift);
+	val |= div << divider->shift;
+
+	if (divider->flags & TEGRA_DIVIDER_UART) {
+		if (div)
+			val |= PERIPH_CLK_UART_DIV_ENB;
+		else
+			val &= ~PERIPH_CLK_UART_DIV_ENB;
+	}
+
+	if (divider->flags & TEGRA_DIVIDER_FIXED)
+		val |= pll_out_override(divider);
+
+	writel_relaxed(val, divider->reg);
+
+	if (divider->lock)
+		spin_unlock_irqrestore(divider->lock, flags);
+
+	return 0;
+}
+
+const struct clk_ops tegra_clk_frac_div_ops = {
+	.recalc_rate = clk_frac_div_recalc_rate,
+	.set_rate = clk_frac_div_set_rate,
+	.round_rate = clk_frac_div_round_rate,
+};
+
+struct clk *tegra_clk_register_divider(const char *name,
+		const char *parent_name, void __iomem *reg,
+		unsigned long flags, u8 clk_divider_flags, u8 shift, u8 width,
+		u8 frac_width, spinlock_t *lock)
+{
+	struct tegra_clk_frac_div *divider;
+	struct clk *clk;
+	struct clk_init_data init;
+
+	divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+	if (!divider) {
+		pr_err("%s: could not allocate fractional divider clk\n",
+		       __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	init.name = name;
+	init.ops = &tegra_clk_frac_div_ops;
+	init.flags = flags;
+	init.parent_names = parent_name ? &parent_name : NULL;
+	init.num_parents = parent_name ? 1 : 0;
+
+	divider->reg = reg;
+	divider->shift = shift;
+	divider->width = width;
+	divider->frac_width = frac_width;
+	divider->lock = lock;
+	divider->flags = clk_divider_flags;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	divider->hw.init = &init;
+
+	clk = clk_register(NULL, &divider->hw);
+	if (IS_ERR(clk))
+		kfree(divider);
+
+	return clk;
+}

drivers/clk/tegra/clk-periph-gate.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/tegra-soc.h>
+
+#include "clk.h"
+
+static DEFINE_SPINLOCK(periph_ref_lock);
+
+/* Macros to assist peripheral gate clock */
+#define read_enb(gate) \
+	readl_relaxed(gate->clk_base + (gate->regs->enb_reg))
+#define write_enb_set(val, gate) \
+	writel_relaxed(val, gate->clk_base + (gate->regs->enb_set_reg))
+#define write_enb_clr(val, gate) \
+	writel_relaxed(val, gate->clk_base + (gate->regs->enb_clr_reg))
+
+#define read_rst(gate) \
+	readl_relaxed(gate->clk_base + (gate->regs->rst_reg))
+#define write_rst_set(val, gate) \
+	writel_relaxed(val, gate->clk_base + (gate->regs->rst_set_reg))
+#define write_rst_clr(val, gate) \
+	writel_relaxed(val, gate->clk_base + (gate->regs->rst_clr_reg))
+
+#define periph_clk_to_bit(periph) (1 << (gate->clk_num % 32))
+
+/* Peripheral gate clock ops */
+static int clk_periph_is_enabled(struct clk_hw *hw)
+{
+	struct tegra_clk_periph_gate *gate = to_clk_periph_gate(hw);
+	int state = 1;
+
+	if (!(read_enb(gate) & periph_clk_to_bit(gate)))
+		state = 0;
+
+	if (!(gate->flags & TEGRA_PERIPH_NO_RESET))
+		if (read_rst(gate) & periph_clk_to_bit(gate))
+			state = 0;
+
+	return state;
+}
+
+static int clk_periph_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph_gate *gate = to_clk_periph_gate(hw);
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&periph_ref_lock, flags);
+
+	gate->enable_refcnt[gate->clk_num]++;
+	if (gate->enable_refcnt[gate->clk_num] > 1) {
+		spin_unlock_irqrestore(&periph_ref_lock, flags);
+		return 0;
+	}
+
+	write_enb_set(periph_clk_to_bit(gate), gate);
+	udelay(2);
+
+	if (!(gate->flags & TEGRA_PERIPH_NO_RESET) &&
+	    !(gate->flags & TEGRA_PERIPH_MANUAL_RESET)) {
+		if (read_rst(gate) & periph_clk_to_bit(gate)) {
+			udelay(5); /* reset propogation delay */
+			write_rst_clr(periph_clk_to_bit(gate), gate);
+		}
+	}
+
+	spin_unlock_irqrestore(&periph_ref_lock, flags);
+
+	return 0;
+}
+
+static void clk_periph_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph_gate *gate = to_clk_periph_gate(hw);
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&periph_ref_lock, flags);
+
+	gate->enable_refcnt[gate->clk_num]--;
+	if (gate->enable_refcnt[gate->clk_num] > 0) {
+		spin_unlock_irqrestore(&periph_ref_lock, flags);
+		return;
+	}
+
+	/*
+	 * If peripheral is in the APB bus then read the APB bus to
+	 * flush the write operation in apb bus. This will avoid the
+	 * peripheral access after disabling clock
+	 */
+	if (gate->flags & TEGRA_PERIPH_ON_APB)
+		tegra_read_chipid();
+
+	write_enb_clr(periph_clk_to_bit(gate), gate);
+
+	spin_unlock_irqrestore(&periph_ref_lock, flags);
+}
+
+void tegra_periph_reset(struct tegra_clk_periph_gate *gate, bool assert)
+{
+	if (gate->flags & TEGRA_PERIPH_NO_RESET)
+		return;
+
+	if (assert) {
+		/*
+		 * If peripheral is in the APB bus then read the APB bus to
+		 * flush the write operation in apb bus. This will avoid the
+		 * peripheral access after disabling clock
+		 */
+		if (gate->flags & TEGRA_PERIPH_ON_APB)
+			tegra_read_chipid();
+
+		write_rst_set(periph_clk_to_bit(gate), gate);
+	} else {
+		write_rst_clr(periph_clk_to_bit(gate), gate);
+	}
+}
+
+const struct clk_ops tegra_clk_periph_gate_ops = {
+	.is_enabled = clk_periph_is_enabled,
+	.enable = clk_periph_enable,
+	.disable = clk_periph_disable,
+};
+
+struct clk *tegra_clk_register_periph_gate(const char *name,
+		const char *parent_name, u8 gate_flags, void __iomem *clk_base,
+		unsigned long flags, int clk_num,
+		struct tegra_clk_periph_regs *pregs, int *enable_refcnt)
+{
+	struct tegra_clk_periph_gate *gate;
+	struct clk *clk;
+	struct clk_init_data init;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate) {
+		pr_err("%s: could not allocate periph gate clk\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	init.name = name;
+	init.flags = flags;
+	init.parent_names = parent_name ? &parent_name : NULL;
+	init.num_parents = parent_name ? 1 : 0;
+	init.ops = &tegra_clk_periph_gate_ops;
+
+	gate->magic = TEGRA_CLK_PERIPH_GATE_MAGIC;
+	gate->clk_base = clk_base;
+	gate->clk_num = clk_num;
+	gate->flags = gate_flags;
+	gate->enable_refcnt = enable_refcnt;
+	gate->regs = pregs;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	gate->hw.init = &init;
+
+	clk = clk_register(NULL, &gate->hw);
+	if (IS_ERR(clk))
+		kfree(gate);
+
+	return clk;
+}

drivers/clk/tegra/clk-periph.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+static u8 clk_periph_get_parent(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *mux_ops = periph->mux_ops;
+	struct clk_hw *mux_hw = &periph->mux.hw;
+
+	mux_hw->clk = hw->clk;
+
+	return mux_ops->get_parent(mux_hw);
+}
+
+static int clk_periph_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *mux_ops = periph->mux_ops;
+	struct clk_hw *mux_hw = &periph->mux.hw;
+
+	mux_hw->clk = hw->clk;
+
+	return mux_ops->set_parent(mux_hw, index);
+}
+
+static unsigned long clk_periph_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+
+	div_hw->clk = hw->clk;
+
+	return div_ops->recalc_rate(div_hw, parent_rate);
+}
+
+static long clk_periph_round_rate(struct clk_hw *hw, unsigned long rate,
+				  unsigned long *prate)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+
+	div_hw->clk = hw->clk;
+
+	return div_ops->round_rate(div_hw, rate, prate);
+}
+
+static int clk_periph_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *div_ops = periph->div_ops;
+	struct clk_hw *div_hw = &periph->divider.hw;
+
+	div_hw->clk = hw->clk;
+
+	return div_ops->set_rate(div_hw, rate, parent_rate);
+}
+
+static int clk_periph_is_enabled(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	gate_hw->clk = hw->clk;
+
+	return gate_ops->is_enabled(gate_hw);
+}
+
+static int clk_periph_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	gate_hw->clk = hw->clk;
+
+	return gate_ops->enable(gate_hw);
+}
+
+static void clk_periph_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_periph *periph = to_clk_periph(hw);
+	const struct clk_ops *gate_ops = periph->gate_ops;
+	struct clk_hw *gate_hw = &periph->gate.hw;
+
+	gate_ops->disable(gate_hw);
+}
+
+const struct clk_ops tegra_clk_periph_ops = {
+	.get_parent = clk_periph_get_parent,
+	.set_parent = clk_periph_set_parent,
+	.recalc_rate = clk_periph_recalc_rate,
+	.round_rate = clk_periph_round_rate,
+	.set_rate = clk_periph_set_rate,
+	.is_enabled = clk_periph_is_enabled,
+	.enable = clk_periph_enable,
+	.disable = clk_periph_disable,
+};
+
+const struct clk_ops tegra_clk_periph_nodiv_ops = {
+	.get_parent = clk_periph_get_parent,
+	.set_parent = clk_periph_set_parent,
+	.is_enabled = clk_periph_is_enabled,
+	.enable = clk_periph_enable,
+	.disable = clk_periph_disable,
+};
+
+static struct clk *_tegra_clk_register_periph(const char *name,
+			const char **parent_names, int num_parents,
+			struct tegra_clk_periph *periph,
+			void __iomem *clk_base, u32 offset, bool div)
+{
+	struct clk *clk;
+	struct clk_init_data init;
+
+	init.name = name;
+	init.ops = div ? &tegra_clk_periph_ops : &tegra_clk_periph_nodiv_ops;
+	init.flags = div ? 0 : CLK_SET_RATE_PARENT;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	periph->hw.init = &init;
+	periph->magic = TEGRA_CLK_PERIPH_MAGIC;
+	periph->mux.reg = clk_base + offset;
+	periph->divider.reg = div ? (clk_base + offset) : NULL;
+	periph->gate.clk_base = clk_base;
+
+	clk = clk_register(NULL, &periph->hw);
+	if (IS_ERR(clk))
+		return clk;
+
+	periph->mux.hw.clk = clk;
+	periph->divider.hw.clk = div ? clk : NULL;
+	periph->gate.hw.clk = clk;
+
+	return clk;
+}
+
+struct clk *tegra_clk_register_periph(const char *name,
+		const char **parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset)
+{
+	return _tegra_clk_register_periph(name, parent_names, num_parents,
+			periph, clk_base, offset, true);
+}
+
+struct clk *tegra_clk_register_periph_nodiv(const char *name,
+		const char **parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset)
+{
+	return _tegra_clk_register_periph(name, parent_names, num_parents,
+			periph, clk_base, offset, false);
+}

drivers/clk/tegra/clk-pll-out.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+
+#include "clk.h"
+
+#define pll_out_enb(p) (BIT(p->enb_bit_idx))
+#define pll_out_rst(p) (BIT(p->rst_bit_idx))
+
+static int clk_pll_out_is_enabled(struct clk_hw *hw)
+{
+	struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
+	u32 val = readl_relaxed(pll_out->reg);
+	int state;
+
+	state = (val & pll_out_enb(pll_out)) ? 1 : 0;
+	if (!(val & (pll_out_rst(pll_out))))
+		state = 0;
+	return state;
+}
+
+static int clk_pll_out_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
+	unsigned long flags = 0;
+	u32 val;
+
+	if (pll_out->lock)
+		spin_lock_irqsave(pll_out->lock, flags);
+
+	val = readl_relaxed(pll_out->reg);
+
+	val |= (pll_out_enb(pll_out) | pll_out_rst(pll_out));
+
+	writel_relaxed(val, pll_out->reg);
+	udelay(2);
+
+	if (pll_out->lock)
+		spin_unlock_irqrestore(pll_out->lock, flags);
+
+	return 0;
+}
+
+static void clk_pll_out_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
+	unsigned long flags = 0;
+	u32 val;
+
+	if (pll_out->lock)
+		spin_lock_irqsave(pll_out->lock, flags);
+
+	val = readl_relaxed(pll_out->reg);
+
+	val &= ~(pll_out_enb(pll_out) | pll_out_rst(pll_out));
+
+	writel_relaxed(val, pll_out->reg);
+	udelay(2);
+
+	if (pll_out->lock)
+		spin_unlock_irqrestore(pll_out->lock, flags);
+}
+
+const struct clk_ops tegra_clk_pll_out_ops = {
+	.is_enabled = clk_pll_out_is_enabled,
+	.enable = clk_pll_out_enable,
+	.disable = clk_pll_out_disable,
+};
+
+struct clk *tegra_clk_register_pll_out(const char *name,
+		const char *parent_name, void __iomem *reg, u8 enb_bit_idx,
+		u8 rst_bit_idx, unsigned long flags, u8 pll_out_flags,
+		spinlock_t *lock)
+{
+	struct tegra_clk_pll_out *pll_out;
+	struct clk *clk;
+	struct clk_init_data init;
+
+	pll_out = kzalloc(sizeof(*pll_out), GFP_KERNEL);
+	if (!pll_out)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &tegra_clk_pll_out_ops;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	init.flags = flags;
+
+	pll_out->reg = reg;
+	pll_out->enb_bit_idx = enb_bit_idx;
+	pll_out->rst_bit_idx = rst_bit_idx;
+	pll_out->flags = pll_out_flags;
+	pll_out->lock = lock;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	pll_out->hw.init = &init;
+
+	clk = clk_register(NULL, &pll_out->hw);
+	if (IS_ERR(clk))
+		kfree(pll_out);
+
+	return clk;
+}

drivers/clk/tegra/clk-pll.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+
+#include "clk.h"
+
+#define PLL_BASE_BYPASS BIT(31)
+#define PLL_BASE_ENABLE BIT(30)
+#define PLL_BASE_REF_ENABLE BIT(29)
+#define PLL_BASE_OVERRIDE BIT(28)
+
+#define PLL_BASE_DIVP_SHIFT 20
+#define PLL_BASE_DIVP_WIDTH 3
+#define PLL_BASE_DIVN_SHIFT 8
+#define PLL_BASE_DIVN_WIDTH 10
+#define PLL_BASE_DIVM_SHIFT 0
+#define PLL_BASE_DIVM_WIDTH 5
+#define PLLU_POST_DIVP_MASK 0x1
+
+#define PLL_MISC_DCCON_SHIFT 20
+#define PLL_MISC_CPCON_SHIFT 8
+#define PLL_MISC_CPCON_WIDTH 4
+#define PLL_MISC_CPCON_MASK ((1 << PLL_MISC_CPCON_WIDTH) - 1)
+#define PLL_MISC_LFCON_SHIFT 4
+#define PLL_MISC_LFCON_WIDTH 4
+#define PLL_MISC_LFCON_MASK ((1 << PLL_MISC_LFCON_WIDTH) - 1)
+#define PLL_MISC_VCOCON_SHIFT 0
+#define PLL_MISC_VCOCON_WIDTH 4
+#define PLL_MISC_VCOCON_MASK ((1 << PLL_MISC_VCOCON_WIDTH) - 1)
+
+#define OUT_OF_TABLE_CPCON 8
+
+#define PMC_PLLP_WB0_OVERRIDE 0xf8
+#define PMC_PLLP_WB0_OVERRIDE_PLLM_ENABLE BIT(12)
+#define PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE BIT(11)
+
+#define PLL_POST_LOCK_DELAY 50
+
+#define PLLDU_LFCON_SET_DIVN 600
+
+#define PLLE_BASE_DIVCML_SHIFT 24
+#define PLLE_BASE_DIVCML_WIDTH 4
+#define PLLE_BASE_DIVP_SHIFT 16
+#define PLLE_BASE_DIVP_WIDTH 7
+#define PLLE_BASE_DIVN_SHIFT 8
+#define PLLE_BASE_DIVN_WIDTH 8
+#define PLLE_BASE_DIVM_SHIFT 0
+#define PLLE_BASE_DIVM_WIDTH 8
+
+#define PLLE_MISC_SETUP_BASE_SHIFT 16
+#define PLLE_MISC_SETUP_BASE_MASK (0xffff << PLLE_MISC_SETUP_BASE_SHIFT)
+#define PLLE_MISC_LOCK_ENABLE BIT(9)
+#define PLLE_MISC_READY BIT(15)
+#define PLLE_MISC_SETUP_EX_SHIFT 2
+#define PLLE_MISC_SETUP_EX_MASK (3 << PLLE_MISC_SETUP_EX_SHIFT)
+#define PLLE_MISC_SETUP_MASK (PLLE_MISC_SETUP_BASE_MASK |	\
+			      PLLE_MISC_SETUP_EX_MASK)
+#define PLLE_MISC_SETUP_VALUE (7 << PLLE_MISC_SETUP_BASE_SHIFT)
+
+#define PLLE_SS_CTRL 0x68
+#define PLLE_SS_DISABLE (7 << 10)
+
+#define PMC_SATA_PWRGT 0x1ac
+#define PMC_SATA_PWRGT_PLLE_IDDQ_VALUE BIT(5)
+#define PMC_SATA_PWRGT_PLLE_IDDQ_SWCTL BIT(4)
+
+#define pll_readl(offset, p) readl_relaxed(p->clk_base + offset)
+#define pll_readl_base(p) pll_readl(p->params->base_reg, p)
+#define pll_readl_misc(p) pll_readl(p->params->misc_reg, p)
+
+#define pll_writel(val, offset, p) writel_relaxed(val, p->clk_base + offset)
+#define pll_writel_base(val, p) pll_writel(val, p->params->base_reg, p)
+#define pll_writel_misc(val, p) pll_writel(val, p->params->misc_reg, p)
+
+#define mask(w) ((1 << (w)) - 1)
+#define divm_mask(p) mask(p->divm_width)
+#define divn_mask(p) mask(p->divn_width)
+#define divp_mask(p) (p->flags & TEGRA_PLLU ? PLLU_POST_DIVP_MASK :	\
+		      mask(p->divp_width))
+
+#define divm_max(p) (divm_mask(p))
+#define divn_max(p) (divn_mask(p))
+#define divp_max(p) (1 << (divp_mask(p)))
+
+static void clk_pll_enable_lock(struct tegra_clk_pll *pll)
+{
+	u32 val;
+
+	if (!(pll->flags & TEGRA_PLL_USE_LOCK))
+		return;
+
+	val = pll_readl_misc(pll);
+	val |= BIT(pll->params->lock_enable_bit_idx);
+	pll_writel_misc(val, pll);
+}
+
+static int clk_pll_wait_for_lock(struct tegra_clk_pll *pll,
+				 void __iomem *lock_addr, u32 lock_bit_idx)
+{
+	int i;
+	u32 val;
+
+	if (!(pll->flags & TEGRA_PLL_USE_LOCK)) {
+		udelay(pll->params->lock_delay);
+		return 0;
+	}
+
+	for (i = 0; i < pll->params->lock_delay; i++) {
+		val = readl_relaxed(lock_addr);
+		if (val & BIT(lock_bit_idx)) {
+			udelay(PLL_POST_LOCK_DELAY);
+			return 0;
+		}
+		udelay(2); /* timeout = 2 * lock time */
+	}
+
+	pr_err("%s: Timed out waiting for pll %s lock\n", __func__,
+	       __clk_get_name(pll->hw.clk));
+
+	return -1;
+}
+
+static int clk_pll_is_enabled(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	u32 val;
+
+	if (pll->flags & TEGRA_PLLM) {
+		val = readl_relaxed(pll->pmc + PMC_PLLP_WB0_OVERRIDE);
+		if (val & PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE)
+			return val & PMC_PLLP_WB0_OVERRIDE_PLLM_ENABLE ? 1 : 0;
+	}
+
+	val = pll_readl_base(pll);
+
+	return val & PLL_BASE_ENABLE ? 1 : 0;
+}
+
+static int _clk_pll_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	u32 val;
+
+	clk_pll_enable_lock(pll);
+
+	val = pll_readl_base(pll);
+	val &= ~PLL_BASE_BYPASS;
+	val |= PLL_BASE_ENABLE;
+	pll_writel_base(val, pll);
+
+	if (pll->flags & TEGRA_PLLM) {
+		val = readl_relaxed(pll->pmc + PMC_PLLP_WB0_OVERRIDE);
+		val |= PMC_PLLP_WB0_OVERRIDE_PLLM_ENABLE;
+		writel_relaxed(val, pll->pmc + PMC_PLLP_WB0_OVERRIDE);
+	}
+
+	clk_pll_wait_for_lock(pll, pll->clk_base + pll->params->base_reg,
+			      pll->params->lock_bit_idx);
+
+	return 0;
+}
+
+static void _clk_pll_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	u32 val;
+
+	val = pll_readl_base(pll);
+	val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
+	pll_writel_base(val, pll);
+
+	if (pll->flags & TEGRA_PLLM) {
+		val = readl_relaxed(pll->pmc + PMC_PLLP_WB0_OVERRIDE);
+		val &= ~PMC_PLLP_WB0_OVERRIDE_PLLM_ENABLE;
+		writel_relaxed(val, pll->pmc + PMC_PLLP_WB0_OVERRIDE);
+	}
+}
+
+static int clk_pll_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	unsigned long flags = 0;
+	int ret;
+
+	if (pll->lock)
+		spin_lock_irqsave(pll->lock, flags);
+
+	ret = _clk_pll_enable(hw);
+
+	if (pll->lock)
+		spin_unlock_irqrestore(pll->lock, flags);
+
+	return ret;
+}
+
+static void clk_pll_disable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	unsigned long flags = 0;
+
+	if (pll->lock)
+		spin_lock_irqsave(pll->lock, flags);
+
+	_clk_pll_disable(hw);
+
+	if (pll->lock)
+		spin_unlock_irqrestore(pll->lock, flags);
+}
+
+static int _get_table_rate(struct clk_hw *hw,
+			   struct tegra_clk_pll_freq_table *cfg,
+			   unsigned long rate, unsigned long parent_rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	struct tegra_clk_pll_freq_table *sel;
+
+	for (sel = pll->freq_table; sel->input_rate != 0; sel++)
+		if (sel->input_rate == parent_rate &&
+		    sel->output_rate == rate)
+			break;
+
+	if (sel->input_rate == 0)
+		return -EINVAL;
+
+	BUG_ON(sel->p < 1);
+
+	cfg->input_rate = sel->input_rate;
+	cfg->output_rate = sel->output_rate;
+	cfg->m = sel->m;
+	cfg->n = sel->n;
+	cfg->p = sel->p;
+	cfg->cpcon = sel->cpcon;
+
+	return 0;
+}
+
+static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
+		      unsigned long rate, unsigned long parent_rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	unsigned long cfreq;
+	u32 p_div = 0;
+
+	switch (parent_rate) {
+	case 12000000:
+	case 26000000:
+		cfreq = (rate <= 1000000 * 1000) ? 1000000 : 2000000;
+		break;
+	case 13000000:
+		cfreq = (rate <= 1000000 * 1000) ? 1000000 : 2600000;
+		break;
+	case 16800000:
+	case 19200000:
+		cfreq = (rate <= 1200000 * 1000) ? 1200000 : 2400000;
+		break;
+	case 9600000:
+	case 28800000:
+		/*
+		 * PLL_P_OUT1 rate is not listed in PLLA table
+		 */
+		cfreq = parent_rate/(parent_rate/1000000);
+		break;
+	default:
+		pr_err("%s Unexpected reference rate %lu\n",
+		       __func__, parent_rate);
+		BUG();
+	}
+
+	/* Raise VCO to guarantee 0.5% accuracy */
+	for (cfg->output_rate = rate; cfg->output_rate < 200 * cfreq;
+	     cfg->output_rate <<= 1)
+		p_div++;
+
+	cfg->p = 1 << p_div;
+	cfg->m = parent_rate / cfreq;
+	cfg->n = cfg->output_rate / cfreq;
+	cfg->cpcon = OUT_OF_TABLE_CPCON;
+
+	if (cfg->m > divm_max(pll) || cfg->n > divn_max(pll) ||
+	    cfg->p > divp_max(pll) || cfg->output_rate > pll->params->vco_max) {
+		pr_err("%s: Failed to set %s rate %lu\n",
+		       __func__, __clk_get_name(hw->clk), rate);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int _program_pll(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
+			unsigned long rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	unsigned long flags = 0;
+	u32 divp, val, old_base;
+	int state;
+
+	divp = __ffs(cfg->p);
+
+	if (pll->flags & TEGRA_PLLU)
+		divp ^= 1;
+
+	if (pll->lock)
+		spin_lock_irqsave(pll->lock, flags);
+
+	old_base = val = pll_readl_base(pll);
+	val &= ~((divm_mask(pll) << pll->divm_shift) |
+		 (divn_mask(pll) << pll->divn_shift) |
+		 (divp_mask(pll) << pll->divp_shift));
+	val |= ((cfg->m << pll->divm_shift) |
+		(cfg->n << pll->divn_shift) |
+		(divp << pll->divp_shift));
+	if (val == old_base) {
+		if (pll->lock)
+			spin_unlock_irqrestore(pll->lock, flags);
+		return 0;
+	}
+
+	state = clk_pll_is_enabled(hw);
+
+	if (state) {
+		_clk_pll_disable(hw);
+		val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
+	}
+	pll_writel_base(val, pll);
+
+	if (pll->flags & TEGRA_PLL_HAS_CPCON) {
+		val = pll_readl_misc(pll);
+		val &= ~(PLL_MISC_CPCON_MASK << PLL_MISC_CPCON_SHIFT);
+		val |= cfg->cpcon << PLL_MISC_CPCON_SHIFT;
+		if (pll->flags & TEGRA_PLL_SET_LFCON) {
+			val &= ~(PLL_MISC_LFCON_MASK << PLL_MISC_LFCON_SHIFT);
+			if (cfg->n >= PLLDU_LFCON_SET_DIVN)
+				val |= 0x1 << PLL_MISC_LFCON_SHIFT;
+		} else if (pll->flags & TEGRA_PLL_SET_DCCON) {
+			val &= ~(0x1 << PLL_MISC_DCCON_SHIFT);
+			if (rate >= (pll->params->vco_max >> 1))
+				val |= 0x1 << PLL_MISC_DCCON_SHIFT;
+		}
+		pll_writel_misc(val, pll);
+	}
+
+	if (pll->lock)
+		spin_unlock_irqrestore(pll->lock, flags);
+
+	if (state)
+		clk_pll_enable(hw);
+
+	return 0;
+}
+
+static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+			unsigned long parent_rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	struct tegra_clk_pll_freq_table cfg;
+
+	if (pll->flags & TEGRA_PLL_FIXED) {
+		if (rate != pll->fixed_rate) {
+			pr_err("%s: Can not change %s fixed rate %lu to %lu\n",
+				__func__, __clk_get_name(hw->clk),
+				pll->fixed_rate, rate);
+			return -EINVAL;
+		}
+		return 0;
+	}
+
+	if (_get_table_rate(hw, &cfg, rate, parent_rate) &&
+	    _calc_rate(hw, &cfg, rate, parent_rate))
+		return -EINVAL;
+
+	return _program_pll(hw, &cfg, rate);
+}
+
+static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+			unsigned long *prate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	struct tegra_clk_pll_freq_table cfg;
+	u64 output_rate = *prate;
+
+	if (pll->flags & TEGRA_PLL_FIXED)
+		return pll->fixed_rate;
+
+	/* PLLM is used for memory; we do not change rate */
+	if (pll->flags & TEGRA_PLLM)
+		return __clk_get_rate(hw->clk);
+
+	if (_get_table_rate(hw, &cfg, rate, *prate) &&
+	    _calc_rate(hw, &cfg, rate, *prate))
+		return -EINVAL;
+
+	output_rate *= cfg.n;
+	do_div(output_rate, cfg.m * cfg.p);
+
+	return output_rate;
+}
+
+static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
+					 unsigned long parent_rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	u32 val = pll_readl_base(pll);
+	u32 divn = 0, divm = 0, divp = 0;
+	u64 rate = parent_rate;
+
+	if (val & PLL_BASE_BYPASS)
+		return parent_rate;
+
+	if ((pll->flags & TEGRA_PLL_FIXED) && !(val & PLL_BASE_OVERRIDE)) {
+		struct tegra_clk_pll_freq_table sel;
+		if (_get_table_rate(hw, &sel, pll->fixed_rate, parent_rate)) {
+			pr_err("Clock %s has unknown fixed frequency\n",
+			       __clk_get_name(hw->clk));
+			BUG();
+		}
+		return pll->fixed_rate;
+	}
+
+	divp = (val >> pll->divp_shift) & (divp_mask(pll));
+	if (pll->flags & TEGRA_PLLU)
+		divp ^= 1;
+
+	divn = (val >> pll->divn_shift) & (divn_mask(pll));
+	divm = (val >> pll->divm_shift) & (divm_mask(pll));
+	divm *= (1 << divp);
+
+	rate *= divn;
+	do_div(rate, divm);
+	return rate;
+}
+
+static int clk_plle_training(struct tegra_clk_pll *pll)
+{
+	u32 val;
+	unsigned long timeout;
+
+	if (!pll->pmc)
+		return -ENOSYS;
+
+	/*
+	 * PLLE is already disabled, and setup cleared;
+	 * create falling edge on PLLE IDDQ input.
+	 */
+	val = readl(pll->pmc + PMC_SATA_PWRGT);
+	val |= PMC_SATA_PWRGT_PLLE_IDDQ_VALUE;
+	writel(val, pll->pmc + PMC_SATA_PWRGT);
+
+	val = readl(pll->pmc + PMC_SATA_PWRGT);
+	val |= PMC_SATA_PWRGT_PLLE_IDDQ_SWCTL;
+	writel(val, pll->pmc + PMC_SATA_PWRGT);
+
+	val = readl(pll->pmc + PMC_SATA_PWRGT);
+	val &= ~PMC_SATA_PWRGT_PLLE_IDDQ_VALUE;
+	writel(val, pll->pmc + PMC_SATA_PWRGT);
+
+	val = pll_readl_misc(pll);
+
+	timeout = jiffies + msecs_to_jiffies(100);
+	while (1) {
+		val = pll_readl_misc(pll);
+		if (val & PLLE_MISC_READY)
+			break;
+		if (time_after(jiffies, timeout)) {
+			pr_err("%s: timeout waiting for PLLE\n", __func__);
+			return -EBUSY;
+		}
+		udelay(300);
+	}
+
+	return 0;
+}
+
+static int clk_plle_enable(struct clk_hw *hw)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	unsigned long input_rate = clk_get_rate(clk_get_parent(hw->clk));
+	struct tegra_clk_pll_freq_table sel;
+	u32 val;
+	int err;
+
+	if (_get_table_rate(hw, &sel, pll->fixed_rate, input_rate))
+		return -EINVAL;
+
+	clk_pll_disable(hw);
+
+	val = pll_readl_misc(pll);
+	val &= ~(PLLE_MISC_LOCK_ENABLE | PLLE_MISC_SETUP_MASK);
+	pll_writel_misc(val, pll);
+
+	val = pll_readl_misc(pll);
+	if (!(val & PLLE_MISC_READY)) {
+		err = clk_plle_training(pll);
+		if (err)
+			return err;
+	}
+
+	if (pll->flags & TEGRA_PLLE_CONFIGURE) {
+		/* configure dividers */
+		val = pll_readl_base(pll);
+		val &= ~(divm_mask(pll) | divn_mask(pll) | divp_mask(pll));
+		val &= ~(PLLE_BASE_DIVCML_WIDTH << PLLE_BASE_DIVCML_SHIFT);
+		val |= sel.m << pll->divm_shift;
+		val |= sel.n << pll->divn_shift;
+		val |= sel.p << pll->divp_shift;
+		val |= sel.cpcon << PLLE_BASE_DIVCML_SHIFT;
+		pll_writel_base(val, pll);
+	}
+
+	val = pll_readl_misc(pll);
+	val |= PLLE_MISC_SETUP_VALUE;
+	val |= PLLE_MISC_LOCK_ENABLE;
+	pll_writel_misc(val, pll);
+
+	val = readl(pll->clk_base + PLLE_SS_CTRL);
+	val |= PLLE_SS_DISABLE;
+	writel(val, pll->clk_base + PLLE_SS_CTRL);
+
+	val |= pll_readl_base(pll);
+	val |= (PLL_BASE_BYPASS | PLL_BASE_ENABLE);
+	pll_writel_base(val, pll);
+
+	clk_pll_wait_for_lock(pll, pll->clk_base + pll->params->misc_reg,
+			      pll->params->lock_bit_idx);
+	return 0;
+}
+
+static unsigned long clk_plle_recalc_rate(struct clk_hw *hw,
+					 unsigned long parent_rate)
+{
+	struct tegra_clk_pll *pll = to_clk_pll(hw);
+	u32 val = pll_readl_base(pll);
+	u32 divn = 0, divm = 0, divp = 0;
+	u64 rate = parent_rate;
+
+	divp = (val >> pll->divp_shift) & (divp_mask(pll));
+	divn = (val >> pll->divn_shift) & (divn_mask(pll));
+	divm = (val >> pll->divm_shift) & (divm_mask(pll));
+	divm *= divp;
+
+	rate *= divn;
+	do_div(rate, divm);
+	return rate;
+}
+
+const struct clk_ops tegra_clk_pll_ops = {
+	.is_enabled = clk_pll_is_enabled,
+	.enable = clk_pll_enable,
+	.disable = clk_pll_disable,
+	.recalc_rate = clk_pll_recalc_rate,
+	.round_rate = clk_pll_round_rate,
+	.set_rate = clk_pll_set_rate,
+};
+
+const struct clk_ops tegra_clk_plle_ops = {
+	.recalc_rate = clk_plle_recalc_rate,
+	.is_enabled = clk_pll_is_enabled,
+	.disable = clk_pll_disable,
+	.enable = clk_plle_enable,
+};
+
+static struct clk *_tegra_clk_register_pll(const char *name,
+		const char *parent_name, void __iomem *clk_base,
+		void __iomem *pmc, unsigned long flags,
+		unsigned long fixed_rate,
+		struct tegra_clk_pll_params *pll_params, u8 pll_flags,
+		struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock,
+		const struct clk_ops *ops)
+{
+	struct tegra_clk_pll *pll;
+	struct clk *clk;
+	struct clk_init_data init;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = ops;
+	init.flags = flags;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+
+	pll->clk_base = clk_base;
+	pll->pmc = pmc;
+
+	pll->freq_table = freq_table;
+	pll->params = pll_params;
+	pll->fixed_rate = fixed_rate;
+	pll->flags = pll_flags;
+	pll->lock = lock;
+
+	pll->divp_shift = PLL_BASE_DIVP_SHIFT;
+	pll->divp_width = PLL_BASE_DIVP_WIDTH;
+	pll->divn_shift = PLL_BASE_DIVN_SHIFT;
+	pll->divn_width = PLL_BASE_DIVN_WIDTH;
+	pll->divm_shift = PLL_BASE_DIVM_SHIFT;
+	pll->divm_width = PLL_BASE_DIVM_WIDTH;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (IS_ERR(clk))
+		kfree(pll);
+
+	return clk;
+}
+
+struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
+		void __iomem *clk_base, void __iomem *pmc,
+		unsigned long flags, unsigned long fixed_rate,
+		struct tegra_clk_pll_params *pll_params, u8 pll_flags,
+		struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock)
+{
+	return _tegra_clk_register_pll(name, parent_name, clk_base, pmc,
+			flags, fixed_rate, pll_params, pll_flags, freq_table,
+			lock, &tegra_clk_pll_ops);
+}
+
+struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
+		void __iomem *clk_base, void __iomem *pmc,
+		unsigned long flags, unsigned long fixed_rate,
+		struct tegra_clk_pll_params *pll_params, u8 pll_flags,
+		struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock)
+{
+	return _tegra_clk_register_pll(name, parent_name, clk_base, pmc,
+			flags, fixed_rate, pll_params, pll_flags, freq_table,
+			lock, &tegra_clk_plle_ops);
+}

drivers/clk/tegra/clk-super.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+
+#include "clk.h"
+
+#define SUPER_STATE_IDLE 0
+#define SUPER_STATE_RUN 1
+#define SUPER_STATE_IRQ 2
+#define SUPER_STATE_FIQ 3
+
+#define SUPER_STATE_SHIFT 28
+#define SUPER_STATE_MASK ((BIT(SUPER_STATE_IDLE) | BIT(SUPER_STATE_RUN) | \
+			   BIT(SUPER_STATE_IRQ) | BIT(SUPER_STATE_FIQ))	\
+			  << SUPER_STATE_SHIFT)
+
+#define SUPER_LP_DIV2_BYPASS (1 << 16)
+
+#define super_state(s) (BIT(s) << SUPER_STATE_SHIFT)
+#define super_state_to_src_shift(m, s) ((m->width * s))
+#define super_state_to_src_mask(m) (((1 << m->width) - 1))
+
+static u8 clk_super_get_parent(struct clk_hw *hw)
+{
+	struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
+	u32 val, state;
+	u8 source, shift;
+
+	val = readl_relaxed(mux->reg);
+
+	state = val & SUPER_STATE_MASK;
+
+	BUG_ON((state != super_state(SUPER_STATE_RUN)) &&
+	       (state != super_state(SUPER_STATE_IDLE)));
+	shift = (state == super_state(SUPER_STATE_IDLE)) ?
+		super_state_to_src_shift(mux, SUPER_STATE_IDLE) :
+		super_state_to_src_shift(mux, SUPER_STATE_RUN);
+
+	source = (val >> shift) & super_state_to_src_mask(mux);
+
+	/*
+	 * If LP_DIV2_BYPASS is not set and PLLX is current parent then
+	 * PLLX/2 is the input source to CCLKLP.
+	 */
+	if ((mux->flags & TEGRA_DIVIDER_2) && !(val & SUPER_LP_DIV2_BYPASS) &&
+	    (source == mux->pllx_index))
+		source = mux->div2_index;
+
+	return source;
+}
+
+static int clk_super_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
+	u32 val, state;
+	u8 parent_index, shift;
+
+	val = readl_relaxed(mux->reg);
+	state = val & SUPER_STATE_MASK;
+	BUG_ON((state != super_state(SUPER_STATE_RUN)) &&
+	       (state != super_state(SUPER_STATE_IDLE)));
+	shift = (state == super_state(SUPER_STATE_IDLE)) ?
+		super_state_to_src_shift(mux, SUPER_STATE_IDLE) :
+		super_state_to_src_shift(mux, SUPER_STATE_RUN);
+
+	/*
+	 * For LP mode super-clock switch between PLLX direct
+	 * and divided-by-2 outputs is allowed only when other
+	 * than PLLX clock source is current parent.
+	 */
+	if ((mux->flags & TEGRA_DIVIDER_2) && ((index == mux->div2_index) ||
+					       (index == mux->pllx_index))) {
+		parent_index = clk_super_get_parent(hw);
+		if ((parent_index == mux->div2_index) ||
+		    (parent_index == mux->pllx_index))
+			return -EINVAL;
+
+		val ^= SUPER_LP_DIV2_BYPASS;
+		writel_relaxed(val, mux->reg);
+		udelay(2);
+
+		if (index == mux->div2_index)
+			index = mux->pllx_index;
+	}
+	val &= ~((super_state_to_src_mask(mux)) << shift);
+	val |= (index & (super_state_to_src_mask(mux))) << shift;
+
+	writel_relaxed(val, mux->reg);
+	udelay(2);
+	return 0;
+}
+
+const struct clk_ops tegra_clk_super_ops = {
+	.get_parent = clk_super_get_parent,
+	.set_parent = clk_super_set_parent,
+};
+
+struct clk *tegra_clk_register_super_mux(const char *name,
+		const char **parent_names, u8 num_parents,
+		unsigned long flags, void __iomem *reg, u8 clk_super_flags,
+		u8 width, u8 pllx_index, u8 div2_index, spinlock_t *lock)
+{
+	struct tegra_clk_super_mux *super;
+	struct clk *clk;
+	struct clk_init_data init;
+
+	super = kzalloc(sizeof(*super), GFP_KERNEL);
+	if (!super) {
+		pr_err("%s: could not allocate super clk\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	init.name = name;
+	init.ops = &tegra_clk_super_ops;
+	init.flags = flags;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+
+	super->reg = reg;
+	super->pllx_index = pllx_index;
+	super->div2_index = div2_index;
+	super->lock = lock;
+	super->width = width;
+	super->flags = clk_super_flags;
+
+	/* Data in .init is copied by clk_register(), so stack variable OK */
+	super->hw.init = &init;
+
+	clk = clk_register(NULL, &super->hw);
+	if (IS_ERR(clk))
+		kfree(super);
+
+	return clk;
+}

drivers/clk/tegra/clk.c

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#include "clk.h"
+
+void __init tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
+				struct clk *clks[], int clk_max)
+{
+	struct clk *clk;
+
+	for (; dup_list->clk_id < clk_max; dup_list++) {
+		clk = clks[dup_list->clk_id];
+		dup_list->lookup.clk = clk;
+		clkdev_add(&dup_list->lookup);
+	}
+}
+
+void __init tegra_init_from_table(struct tegra_clk_init_table *tbl,
+				  struct clk *clks[], int clk_max)
+{
+	struct clk *clk;
+
+	for (; tbl->clk_id < clk_max; tbl++) {
+		clk = clks[tbl->clk_id];
+		if (IS_ERR_OR_NULL(clk))
+			return;
+
+		if (tbl->parent_id < clk_max) {
+			struct clk *parent = clks[tbl->parent_id];
+			if (clk_set_parent(clk, parent)) {
+				pr_err("%s: Failed to set parent %s of %s\n",
+				       __func__, __clk_get_name(parent),
+				       __clk_get_name(clk));
+				WARN_ON(1);
+			}
+		}
+
+		if (tbl->rate)
+			if (clk_set_rate(clk, tbl->rate)) {
+				pr_err("%s: Failed to set rate %lu of %s\n",
+				       __func__, tbl->rate,
+				       __clk_get_name(clk));
+				WARN_ON(1);
+			}
+
+		if (tbl->state)
+			if (clk_prepare_enable(clk)) {
+				pr_err("%s: Failed to enable %s\n", __func__,
+				       __clk_get_name(clk));
+				WARN_ON(1);
+			}
+	}
+}

drivers/clk/tegra/clk.h

+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TEGRA_CLK_H
+#define __TEGRA_CLK_H
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+
+/**
+ * struct tegra_clk_sync_source - external clock source from codec
+ *
+ * @hw: handle between common and hardware-specific interfaces
+ * @rate: input frequency from source
+ * @max_rate: max rate allowed
+ */
+struct tegra_clk_sync_source {
+	struct		clk_hw hw;
+	unsigned long	rate;
+	unsigned long	max_rate;
+};
+
+#define to_clk_sync_source(_hw)					\
+	container_of(_hw, struct tegra_clk_sync_source, hw)
+
+extern const struct clk_ops tegra_clk_sync_source_ops;
+struct clk *tegra_clk_register_sync_source(const char *name,
+		unsigned long fixed_rate, unsigned long max_rate);
+
+/**
+ * struct tegra_clk_frac_div - fractional divider clock
+ *
+ * @hw:		handle between common and hardware-specific interfaces
+ * @reg:	register containing divider
+ * @flags:	hardware-specific flags
+ * @shift:	shift to the divider bit field
+ * @width:	width of the divider bit field
+ * @frac_width:	width of the fractional bit field
+ * @lock:	register lock
+ *
+ * Flags:
+ * TEGRA_DIVIDER_ROUND_UP - This flags indicates to round up the divider value.
+ * TEGRA_DIVIDER_FIXED - Fixed rate PLL dividers has addition override bit, this
+ *      flag indicates that this divider is for fixed rate PLL.
+ * TEGRA_DIVIDER_INT - Some modules can not cope with the duty cycle when
+ *      fraction bit is set. This flags indicates to calculate divider for which
+ *      fracton bit will be zero.
+ * TEGRA_DIVIDER_UART - UART module divider has additional enable bit which is
+ *      set when divider value is not 0. This flags indicates that the divider
+ *      is for UART module.
+ */
+struct tegra_clk_frac_div {
+	struct clk_hw	hw;
+	void __iomem	*reg;
+	u8		flags;
+	u8		shift;
+	u8		width;
+	u8		frac_width;
+	spinlock_t	*lock;
+};
+
+#define to_clk_frac_div(_hw) container_of(_hw, struct tegra_clk_frac_div, hw)
+
+#define TEGRA_DIVIDER_ROUND_UP BIT(0)
+#define TEGRA_DIVIDER_FIXED BIT(1)
+#define TEGRA_DIVIDER_INT BIT(2)
+#define TEGRA_DIVIDER_UART BIT(3)
+
+extern const struct clk_ops tegra_clk_frac_div_ops;
+struct clk *tegra_clk_register_divider(const char *name,
+		const char *parent_name, void __iomem *reg,
+		unsigned long flags, u8 clk_divider_flags, u8 shift, u8 width,
+		u8 frac_width, spinlock_t *lock);
+
+/*
+ * Tegra PLL:
+ *
+ * In general, there are 3 requirements for each PLL
+ * that SW needs to be comply with.
+ * (1) Input frequency range (REF).
+ * (2) Comparison frequency range (CF). CF = REF/DIVM.
+ * (3) VCO frequency range (VCO).  VCO = CF * DIVN.
+ *
+ * The final PLL output frequency (FO) = VCO >> DIVP.
+ */
+
+/**
+ * struct tegra_clk_pll_freq_table - PLL frequecy table
+ *
+ * @input_rate:		input rate from source
+ * @output_rate:	output rate from PLL for the input rate
+ * @n:			feedback divider
+ * @m:			input divider
+ * @p:			post divider
+ * @cpcon:		charge pump current
+ */
+struct tegra_clk_pll_freq_table {
+	unsigned long	input_rate;
+	unsigned long	output_rate;
+	u16		n;
+	u16		m;
+	u8		p;
+	u8		cpcon;
+};
+
+/**
+ * struct clk_pll_params - PLL parameters
+ *
+ * @input_min:			Minimum input frequency
+ * @input_max:			Maximum input frequency
+ * @cf_min:			Minimum comparison frequency
+ * @cf_max:			Maximum comparison frequency
+ * @vco_min:			Minimum VCO frequency
+ * @vco_max:			Maximum VCO frequency
+ * @base_reg:			PLL base reg offset
+ * @misc_reg:			PLL misc reg offset
+ * @lock_reg:			PLL lock reg offset
+ * @lock_bit_idx:		Bit index for PLL lock status
+ * @lock_enable_bit_idx:	Bit index to enable PLL lock
+ * @lock_delay:			Delay in us if PLL lock is not used
+ */
+struct tegra_clk_pll_params {
+	unsigned long	input_min;
+	unsigned long	input_max;
+	unsigned long	cf_min;
+	unsigned long	cf_max;
+	unsigned long	vco_min;
+	unsigned long	vco_max;
+
+	u32		base_reg;
+	u32		misc_reg;
+	u32		lock_reg;
+	u32		lock_bit_idx;
+	u32		lock_enable_bit_idx;
+	int		lock_delay;
+};
+
+/**
+ * struct tegra_clk_pll - Tegra PLL clock
+ *
+ * @hw:		handle between common and hardware-specifix interfaces
+ * @clk_base:	address of CAR controller
+ * @pmc:	address of PMC, required to read override bits
+ * @freq_table:	array of frequencies supported by PLL
+ * @params:	PLL parameters
+ * @flags:	PLL flags
+ * @fixed_rate:	PLL rate if it is fixed
+ * @lock:	register lock
+ * @divn_shift:	shift to the feedback divider bit field
+ * @divn_width:	width of the feedback divider bit field
+ * @divm_shift:	shift to the input divider bit field
+ * @divm_width:	width of the input divider bit field
+ * @divp_shift:	shift to the post divider bit field
+ * @divp_width:	width of the post divider bit field
+ *
+ * Flags:
+ * TEGRA_PLL_USE_LOCK - This flag indicated to use lock bits for
+ *     PLL locking. If not set it will use lock_delay value to wait.
+ * TEGRA_PLL_HAS_CPCON - This flag indicates that CPCON value needs
+ *     to be programmed to change output frequency of the PLL.
+ * TEGRA_PLL_SET_LFCON - This flag indicates that LFCON value needs
+ *     to be programmed to change output frequency of the PLL.
+ * TEGRA_PLL_SET_DCCON - This flag indicates that DCCON value needs
+ *     to be programmed to change output frequency of the PLL.
+ * TEGRA_PLLU - PLLU has inverted post divider. This flags indicated
+ *     that it is PLLU and invert post divider value.
+ * TEGRA_PLLM - PLLM has additional override settings in PMC. This
+ *     flag indicates that it is PLLM and use override settings.
+ * TEGRA_PLL_FIXED - We are not supposed to change output frequency
+ *     of some plls.
+ * TEGRA_PLLE_CONFIGURE - Configure PLLE when enabling.
+ */
+struct tegra_clk_pll {
+	struct clk_hw	hw;
+	void __iomem	*clk_base;
+	void __iomem	*pmc;
+	u8		flags;
+	unsigned long	fixed_rate;
+	spinlock_t	*lock;
+	u8		divn_shift;
+	u8		divn_width;
+	u8		divm_shift;
+	u8		divm_width;
+	u8		divp_shift;
+	u8		divp_width;
+	struct tegra_clk_pll_freq_table	*freq_table;
+	struct tegra_clk_pll_params	*params;
+};
+
+#define to_clk_pll(_hw) container_of(_hw, struct tegra_clk_pll, hw)
+
+#define TEGRA_PLL_USE_LOCK BIT(0)
+#define TEGRA_PLL_HAS_CPCON BIT(1)
+#define TEGRA_PLL_SET_LFCON BIT(2)
+#define TEGRA_PLL_SET_DCCON BIT(3)
+#define TEGRA_PLLU BIT(4)
+#define TEGRA_PLLM BIT(5)
+#define TEGRA_PLL_FIXED BIT(6)
+#define TEGRA_PLLE_CONFIGURE BIT(7)
+
+extern const struct clk_ops tegra_clk_pll_ops;
+extern const struct clk_ops tegra_clk_plle_ops;
+struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
+		void __iomem *clk_base, void __iomem *pmc,
+		unsigned long flags, unsigned long fixed_rate,
+		struct tegra_clk_pll_params *pll_params, u8 pll_flags,
+		struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock);
+struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
+		void __iomem *clk_base, void __iomem *pmc,
+		unsigned long flags, unsigned long fixed_rate,
+		struct tegra_clk_pll_params *pll_params, u8 pll_flags,
+		struct tegra_clk_pll_freq_table *freq_table, spinlock_t *lock);
+
+/**
+ * struct tegra_clk_pll_out - PLL divider down clock
+ *
+ * @hw:			handle between common and hardware-specific interfaces
+ * @reg:		register containing the PLL divider
+ * @enb_bit_idx:	bit to enable/disable PLL divider
+ * @rst_bit_idx:	bit to reset PLL divider
+ * @lock:		register lock
+ * @flags:		hardware-specific flags
+ */
+struct tegra_clk_pll_out {
+	struct clk_hw	hw;
+	void __iomem	*reg;
+	u8		enb_bit_idx;
+	u8		rst_bit_idx;
+	spinlock_t	*lock;
+	u8		flags;
+};
+
+#define to_clk_pll_out(_hw) container_of(_hw, struct tegra_clk_pll_out, hw)
+
+extern const struct clk_ops tegra_clk_pll_out_ops;
+struct clk *tegra_clk_register_pll_out(const char *name,
+		const char *parent_name, void __iomem *reg, u8 enb_bit_idx,
+		u8 rst_bit_idx, unsigned long flags, u8 pll_div_flags,
+		spinlock_t *lock);
+
+/**
+ * struct tegra_clk_periph_regs -  Registers controlling peripheral clock
+ *
+ * @enb_reg:		read the enable status
+ * @enb_set_reg:	write 1 to enable clock
+ * @enb_clr_reg:	write 1 to disable clock
+ * @rst_reg:		read the reset status
+ * @rst_set_reg:	write 1 to assert the reset of peripheral
+ * @rst_clr_reg:	write 1 to deassert the reset of peripheral
+ */
+struct tegra_clk_periph_regs {
+	u32 enb_reg;
+	u32 enb_set_reg;
+	u32 enb_clr_reg;
+	u32 rst_reg;
+	u32 rst_set_reg;
+	u32 rst_clr_reg;
+};
+
+/**
+ * struct tegra_clk_periph_gate - peripheral gate clock
+ *
+ * @magic:		magic number to validate type
+ * @hw:			handle between common and hardware-specific interfaces
+ * @clk_base:		address of CAR controller
+ * @regs:		Registers to control the peripheral
+ * @flags:		hardware-specific flags
+ * @clk_num:		Clock number
+ * @enable_refcnt:	array to maintain reference count of the clock
+ *
+ * Flags:
+ * TEGRA_PERIPH_NO_RESET - This flag indicates that reset is not allowed
+ *     for this module.
+ * TEGRA_PERIPH_MANUAL_RESET - This flag indicates not to reset module
+ *     after clock enable and driver for the module is responsible for
+ *     doing reset.
+ * TEGRA_PERIPH_ON_APB - If peripheral is in the APB bus then read the
+ *     bus to flush the write operation in apb bus. This flag indicates
+ *     that this peripheral is in apb bus.
+ */
+struct tegra_clk_periph_gate {
+	u32			magic;
+	struct clk_hw		hw;
+	void __iomem		*clk_base;
+	u8			flags;
+	int			clk_num;
+	int			*enable_refcnt;
+	struct tegra_clk_periph_regs	*regs;
+};
+
+#define to_clk_periph_gate(_hw)					\
+	container_of(_hw, struct tegra_clk_periph_gate, hw)
+
+#define TEGRA_CLK_PERIPH_GATE_MAGIC 0x17760309
+
+#define TEGRA_PERIPH_NO_RESET BIT(0)
+#define TEGRA_PERIPH_MANUAL_RESET BIT(1)
+#define TEGRA_PERIPH_ON_APB BIT(2)
+
+void tegra_periph_reset(struct tegra_clk_periph_gate *gate, bool assert);
+extern const struct clk_ops tegra_clk_periph_gate_ops;
+struct clk *tegra_clk_register_periph_gate(const char *name,
+		const char *parent_name, u8 gate_flags, void __iomem *clk_base,
+		unsigned long flags, int clk_num,
+		struct tegra_clk_periph_regs *pregs, int *enable_refcnt);
+
+/**
+ * struct clk-periph - peripheral clock
+ *
+ * @magic:	magic number to validate type
+ * @hw:		handle between common and hardware-specific interfaces
+ * @mux:	mux clock
+ * @divider:	divider clock
+ * @gate:	gate clock
+ * @mux_ops:	mux clock ops
+ * @div_ops:	divider clock ops
+ * @gate_ops:	gate clock ops
+ */
+struct tegra_clk_periph {
+	u32			magic;
+	struct clk_hw		hw;
+	struct clk_mux		mux;
+	struct tegra_clk_frac_div	divider;
+	struct tegra_clk_periph_gate	gate;
+
+	const struct clk_ops	*mux_ops;
+	const struct clk_ops	*div_ops;
+	const struct clk_ops	*gate_ops;
+};
+
+#define to_clk_periph(_hw) container_of(_hw, struct tegra_clk_periph, hw)
+
+#define TEGRA_CLK_PERIPH_MAGIC 0x18221223
+
+extern const struct clk_ops tegra_clk_periph_ops;
+struct clk *tegra_clk_register_periph(const char *name,
+		const char **parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset);
+struct clk *tegra_clk_register_periph_nodiv(const char *name,
+		const char **parent_names, int num_parents,
+		struct tegra_clk_periph *periph, void __iomem *clk_base,
+		u32 offset);
+
+#define TEGRA_CLK_PERIPH(_mux_shift, _mux_width, _mux_flags,		\
+			 _div_shift, _div_width, _div_frac_width,	\
+			 _div_flags, _clk_num, _enb_refcnt, _regs,	\
+			 _gate_flags)					\
+	{								\
+		.mux = {						\
+			.flags = _mux_flags,				\
+			.shift = _mux_shift,				\
+			.width = _mux_width,				\
+		},							\
+		.divider = {						\
+			.flags = _div_flags,				\
+			.shift = _div_shift,				\
+			.width = _div_width,				\
+			.frac_width = _div_frac_width,			\
+		},							\
+		.gate = {						\
+			.flags = _gate_flags,				\
+			.clk_num = _clk_num,				\
+			.enable_refcnt = _enb_refcnt,			\
+			.regs = _regs,					\
+		},							\
+		.mux_ops = &clk_mux_ops,				\
+		.div_ops = &tegra_clk_frac_div_ops,			\
+		.gate_ops = &tegra_clk_periph_gate_ops,			\
+	}
+
+struct tegra_periph_init_data {
+	const char *name;
+	int clk_id;
+	const char **parent_names;
+	int num_parents;
+	struct tegra_clk_periph periph;
+	u32 offset;
+	const char *con_id;
+	const char *dev_id;
+};
+
+#define TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parent_names, _offset, \
+			_mux_shift, _mux_width, _mux_flags, _div_shift,	\
+			_div_width, _div_frac_width, _div_flags, _regs,	\
+			_clk_num, _enb_refcnt, _gate_flags, _clk_id)	\
+	{								\
+		.name = _name,						\
+		.clk_id = _clk_id,					\
+		.parent_names = _parent_names,				\
+		.num_parents = ARRAY_SIZE(_parent_names),		\
+		.periph = TEGRA_CLK_PERIPH(_mux_shift, _mux_width,	\
+					   _mux_flags, _div_shift,	\
+					   _div_width, _div_frac_width,	\
+					   _div_flags, _clk_num,	\
+					   _enb_refcnt, _regs,		\
+					   _gate_flags),		\
+		.offset = _offset,					\
+		.con_id = _con_id,					\
+		.dev_id = _dev_id,					\
+	}
+
+/**
+ * struct clk_super_mux - super clock
+ *
+ * @hw:		handle between common and hardware-specific interfaces
+ * @reg:	register controlling multiplexer
+ * @width:	width of the multiplexer bit field
+ * @flags:	hardware-specific flags
+ * @div2_index:	bit controlling divide-by-2
+ * @pllx_index:	PLLX index in the parent list
+ * @lock:	register lock
+ *
+ * Flags:
+ * TEGRA_DIVIDER_2 - LP cluster has additional divider. This flag indicates
+ *     that this is LP cluster clock.
+ */
+struct tegra_clk_super_mux {
+	struct clk_hw	hw;
+	void __iomem	*reg;
+	u8		width;
+	u8		flags;
+	u8		div2_index;
+	u8		pllx_index;
+	spinlock_t	*lock;
+};
+
+#define to_clk_super_mux(_hw) container_of(_hw, struct tegra_clk_super_mux, hw)
+
+#define TEGRA_DIVIDER_2 BIT(0)
+
+extern const struct clk_ops tegra_clk_super_ops;
+struct clk *tegra_clk_register_super_mux(const char *name,
+		const char **parent_names, u8 num_parents,
+		unsigned long flags, void __iomem *reg, u8 clk_super_flags,
+		u8 width, u8 pllx_index, u8 div2_index, spinlock_t *lock);
+
+/**
+ * struct clk_init_tabel - clock initialization table
+ * @clk_id:	clock id as mentioned in device tree bindings
+ * @parent_id:	parent clock id as mentioned in device tree bindings
+ * @rate:	rate to set
+ * @state:	enable/disable
+ */
+struct tegra_clk_init_table {
+	unsigned int	clk_id;
+	unsigned int	parent_id;
+	unsigned long	rate;
+	int		state;
+};
+
+/**
+ * struct clk_duplicate - duplicate clocks
+ * @clk_id:	clock id as mentioned in device tree bindings
+ * @lookup:	duplicate lookup entry for the clock
+ */
+struct tegra_clk_duplicate {
+	int			clk_id;
+	struct clk_lookup	lookup;
+};
+
+#define TEGRA_CLK_DUPLICATE(_clk_id, _dev, _con) \
+	{					\
+		.clk_id = _clk_id,		\
+		.lookup = {			\
+			.dev_id = _dev,		\
+			.con_id = _con,		\
+		},				\
+	}
+
+void tegra_init_from_table(struct tegra_clk_init_table *tbl,
+		struct clk *clks[], int clk_max);
+
+void tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
+		struct clk *clks[], int clk_max);
+
+#endif /* TEGRA_CLK_H */