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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
- */
- #include <linux/clk-provider.h>
- #include <linux/io.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);
- }
- 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;
- }
- 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;
- }
- 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);
- }
- 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;
- }
- 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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