Release 4.7 drivers/clk/tegra/clk-periph-fixed.c
/*
* Copyright (c) 2015, 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 "clk.h"
static inline struct tegra_clk_periph_fixed *
to_tegra_clk_periph_fixed(struct clk_hw *hw)
{
return container_of(hw, struct tegra_clk_periph_fixed, hw);
}
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static int tegra_clk_periph_fixed_is_enabled(struct clk_hw *hw)
{
struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
u32 mask = 1 << (fixed->num % 32), value;
value = readl(fixed->base + fixed->regs->enb_reg);
if (value & mask) {
value = readl(fixed->base + fixed->regs->rst_reg);
if ((value & mask) == 0)
return 1;
}
return 0;
}
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static int tegra_clk_periph_fixed_enable(struct clk_hw *hw)
{
struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
u32 mask = 1 << (fixed->num % 32);
writel(mask, fixed->base + fixed->regs->enb_set_reg);
return 0;
}
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static void tegra_clk_periph_fixed_disable(struct clk_hw *hw)
{
struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
u32 mask = 1 << (fixed->num % 32);
writel(mask, fixed->base + fixed->regs->enb_clr_reg);
}
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static unsigned long
tegra_clk_periph_fixed_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
unsigned long long rate;
rate = (unsigned long long)parent_rate * fixed->mul;
do_div(rate, fixed->div);
return (unsigned long)rate;
}
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static const struct clk_ops tegra_clk_periph_fixed_ops = {
.is_enabled = tegra_clk_periph_fixed_is_enabled,
.enable = tegra_clk_periph_fixed_enable,
.disable = tegra_clk_periph_fixed_disable,
.recalc_rate = tegra_clk_periph_fixed_recalc_rate,
};
struct clk *tegra_clk_register_periph_fixed(const char *name,
const char *parent,
unsigned long flags,
void __iomem *base,
unsigned int mul,
unsigned int div,
unsigned int num)
{
const struct tegra_clk_periph_regs *regs;
struct tegra_clk_periph_fixed *fixed;
struct clk_init_data init;
struct clk *clk;
regs = get_reg_bank(num);
if (!regs)
return ERR_PTR(-EINVAL);
fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
if (!fixed)
return ERR_PTR(-ENOMEM);
init.name = name;
init.flags = flags;
init.parent_names = parent ? &parent : NULL;
init.num_parents = parent ? 1 : 0;
init.ops = &tegra_clk_periph_fixed_ops;
fixed->base = base;
fixed->regs = regs;
fixed->mul = mul;
fixed->div = div;
fixed->num = num;
fixed->hw.init = &init;
clk = clk_register(NULL, &fixed->hw);
if (IS_ERR(clk))
kfree(fixed);
return clk;
}
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