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SubjectRe: [PATCH v4 2/9] clk: tegra: Add tegra specific clocks
Hi Prahant,

Some nit-pick/cosmetic comments inlined...

Prashant Gaikwad <pgaikwad@nvidia.com> wrote @ Fri, 11 Jan 2013 08:46:20 +0100:

> Add tegra specific clocks, pll, pll_out, peripheral,
> frac_divider, super.
>
> Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
> ---
> drivers/clk/Makefile | 1 +
> drivers/clk/tegra/Makefile | 8 +
> drivers/clk/tegra/clk-audio-sync.c | 89 +++++
> drivers/clk/tegra/clk-divider.c | 188 ++++++++++
> drivers/clk/tegra/clk-periph-gate.c | 182 ++++++++++
> drivers/clk/tegra/clk-periph.c | 190 ++++++++++
> drivers/clk/tegra/clk-pll-out.c | 124 +++++++
> drivers/clk/tegra/clk-pll.c | 676 +++++++++++++++++++++++++++++++++++
> drivers/clk/tegra/clk-super.c | 154 ++++++++
> drivers/clk/tegra/clk.c | 69 ++++
> drivers/clk/tegra/clk.h | 476 ++++++++++++++++++++++++
> 11 files changed, 2157 insertions(+), 0 deletions(-)
> create mode 100644 drivers/clk/tegra/Makefile
> create mode 100644 drivers/clk/tegra/clk-audio-sync.c
> create mode 100644 drivers/clk/tegra/clk-divider.c
> create mode 100644 drivers/clk/tegra/clk-periph-gate.c
> create mode 100644 drivers/clk/tegra/clk-periph.c
> create mode 100644 drivers/clk/tegra/clk-pll-out.c
> create mode 100644 drivers/clk/tegra/clk-pll.c
> create mode 100644 drivers/clk/tegra/clk-super.c
> create mode 100644 drivers/clk/tegra/clk.c
> create mode 100644 drivers/clk/tegra/clk.h
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index ee90e87..f0b269a 100644
> --- a/drivers/clk/Makefile
> +++ b/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
> diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
> new file mode 100644
> index 0000000..68bd353
> --- /dev/null
> +++ b/drivers/clk/tegra/Makefile
> @@ -0,0 +1,8 @@
> +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
> diff --git a/drivers/clk/tegra/clk-audio-sync.c b/drivers/clk/tegra/clk-audio-sync.c
> new file mode 100644
> index 0000000..bb2fe43
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-audio-sync.c
> @@ -0,0 +1,89 @@
> +/*
> + * 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"
> +
> +#define to_clk_sync_source(_hw) \
> + container_of(_hw, struct tegra_clk_sync_source, hw)
> +
> +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_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(struct tegra_clk_sync_source), 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;
> +
> + sync->hw.init = &init;
> +
> + clk = clk_register(NULL, &sync->hw);

The above usage of "init" from stack may be a bit
unfamilier. I can guess that its content is copied in clk_register()
but it's originally defined in stack. So I just prefer to writing this
as below. It may be somewhat explict that we know init is from stack.

struct clk *tegra_clk_sync_source(const char *name, unsigned long rate,
unsigned long max_rate)
{
struct tegra_clk_sync_source *sync;
struct clk_init_data init = {
.ops = &tegra_clk_sync_source_ops;
.name = name;
.flags = CLK_IS_ROOT;
.parent_names = NULL;
.num_parents = 0;
};
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;
sync->hw.init = &init;

clk = clk_register(NULL, &sync->hw);

Maybe other init as well?

> + if (IS_ERR(clk))
> + kfree(sync);
> +
> + return clk;
> +}
> diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c
> new file mode 100644
> index 0000000..fcd0123
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-divider.c
> @@ -0,0 +1,188 @@
> +/*
> + * 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 to_clk_frac_div(_hw) container_of(_hw, struct tegra_clk_frac_div, hw)
> +
> +#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_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(struct tegra_clk_frac_div), GFP_KERNEL);
divider = kzalloc(sizeof(*divider), GFP_KERNEL);

Maybe other *alloc() as well?

> + 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;
> +
> + divider->hw.init = &init;
> +
> + clk = clk_register(NULL, &divider->hw);
> + if (IS_ERR(clk))
> + kfree(divider);
> +
> + return clk;
> +}
> diff --git a/drivers/clk/tegra/clk-periph-gate.c b/drivers/clk/tegra/clk-periph-gate.c
> new file mode 100644
> index 0000000..5f0919d
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-periph-gate.c
> @@ -0,0 +1,182 @@
> +/*
> + * 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);
> +
> +#define to_clk_periph_gate(_hw) \
> + container_of(_hw, struct tegra_clk_periph_gate, hw)
> +
> +/* 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_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(struct tegra_clk_periph_gate), GFP_KERNEL);

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;
> +
> + gate->hw.init = &init;
> +
> + clk = clk_register(NULL, &gate->hw);
> + if (IS_ERR(clk))
> + kfree(gate);
> +
> + return clk;
> +}
> diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
> new file mode 100644
> index 0000000..ed0ded2
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-periph.c
> @@ -0,0 +1,190 @@
> +/*
> + * 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"
> +
> +#define to_clk_periph(_hw) container_of(_hw, struct tegra_clk_periph, hw)
> +
> +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,
> +};
> +
> +struct clk *tegra_clk_periph(const char *name, const char **parent_names,
> + int num_parents, struct tegra_clk_periph *periph,
> + void __iomem *clk_base, u32 offset)
> +{
> + struct clk *clk;
> + struct clk_init_data init;
> +
> + init.name = name;
> + init.ops = &tegra_clk_periph_ops;
> + init.flags = 0;
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> +
> + periph->hw.init = &init;
> + periph->magic = TEGRA_CLK_PERIPH_MAGIC;
> + periph->mux.reg = clk_base + offset;
> + periph->divider.reg = clk_base + offset;
> + 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 = clk;
> + periph->gate.hw.clk = clk;
> +
> + return clk;
> +}
> +
> +struct clk *tegra_clk_periph_nodiv(const char *name, const char **parent_names,
> + int num_parents, struct tegra_clk_periph *periph,
> + void __iomem *clk_base, u32 offset)
> +{
> + struct clk *clk;
> + struct clk_init_data init;
> +
> + init.name = name;
> + init.ops = &tegra_clk_periph_nodiv_ops;
> + init.flags = CLK_SET_RATE_PARENT;
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> +
> + periph->hw.init = &init;
> + periph->magic = TEGRA_CLK_PERIPH_MAGIC;
> + periph->mux.reg = clk_base + offset;
> + periph->gate.clk_base = clk_base;
> +
> + clk = clk_register(NULL, &periph->hw);
> + if (IS_ERR(clk))
> + return clk;
> +
> + periph->mux.hw.clk = clk;
> + periph->gate.hw.clk = clk;
> +
> + return clk;
> +}
> diff --git a/drivers/clk/tegra/clk-pll-out.c b/drivers/clk/tegra/clk-pll-out.c
> new file mode 100644
> index 0000000..60a117b
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-pll-out.c
> @@ -0,0 +1,124 @@
> +/*
> + * 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 to_clk_pll_out(_hw) container_of(_hw, struct tegra_clk_pll_out, hw)
> +
> +#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_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(struct tegra_clk_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;
> +
> + pll_out->hw.init = &init;
> +
> + clk = clk_register(NULL, &pll_out->hw);
> + if (IS_ERR(clk))
> + kfree(pll_out);
> +
> + return clk;
> +}
> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> new file mode 100644
> index 0000000..f8dc7c0
> --- /dev/null
> +++ b/drivers/clk/tegra/clk-pll.c
> @@ -0,0 +1,676 @@
> +/*
> + * 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 to_clk_pll(_hw) container_of(_hw, struct tegra_clk_pll, hw)
> +
> +#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) {
> + if (pll->lock)
> + spin_unlock_irqrestore(pll->lock, flags);
> +
> + clk_pll_disable(hw);
> + val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
> +
> + if (pll->lock)
> + spin_lock_irqsave(pll->lock, flags);
> + }
> + 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;
> + int 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 = 300;
> + while (!(val & PLLE_MISC_READY)) {
> + val = pll_readl_misc(pll);
> + udelay(300);
> + if (--timeout == 0) {
> + pr_err("%s: timeout waiting for PLLE\n", __func__);
> + return -EBUSY;
> + }
> + }

Can the above be written as below?

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);
}

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