05d2eaac96
Sigma-delta modulation is supported for some PLLs. This allows fractional-N multipliers to be used. In reality we don't know how to configure the individual settings for it. However we can copy existing settings from the vendor kernel to support clock rates that cannot be generated from integer factors, but are really desired. The vendor kernel only uses this for the audio PLL clock, and only on the latest chips. This patch adds a new class of clocks, along with helper functions. It is intended to be merged into N-M-factor style clocks as a feature, much like fractional clocks. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
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* Copyright (c) 2016 Maxime Ripard. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _COMMON_H_
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#define _COMMON_H_
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#include <linux/compiler.h>
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#include <linux/clk-provider.h>
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#define CCU_FEATURE_FRACTIONAL BIT(0)
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#define CCU_FEATURE_VARIABLE_PREDIV BIT(1)
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#define CCU_FEATURE_FIXED_PREDIV BIT(2)
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#define CCU_FEATURE_FIXED_POSTDIV BIT(3)
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#define CCU_FEATURE_ALL_PREDIV BIT(4)
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#define CCU_FEATURE_LOCK_REG BIT(5)
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#define CCU_FEATURE_MMC_TIMING_SWITCH BIT(6)
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#define CCU_FEATURE_SIGMA_DELTA_MOD BIT(7)
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/* MMC timing mode switch bit */
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#define CCU_MMC_NEW_TIMING_MODE BIT(30)
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struct device_node;
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#define CLK_HW_INIT(_name, _parent, _ops, _flags) \
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&(struct clk_init_data) { \
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.flags = _flags, \
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.name = _name, \
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.parent_names = (const char *[]) { _parent }, \
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.num_parents = 1, \
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.ops = _ops, \
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}
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#define CLK_HW_INIT_PARENTS(_name, _parents, _ops, _flags) \
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&(struct clk_init_data) { \
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.flags = _flags, \
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.name = _name, \
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.parent_names = _parents, \
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.num_parents = ARRAY_SIZE(_parents), \
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.ops = _ops, \
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}
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#define CLK_FIXED_FACTOR(_struct, _name, _parent, \
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_div, _mult, _flags) \
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struct clk_fixed_factor _struct = { \
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.div = _div, \
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.mult = _mult, \
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.hw.init = CLK_HW_INIT(_name, \
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_parent, \
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&clk_fixed_factor_ops, \
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_flags), \
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}
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struct ccu_common {
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void __iomem *base;
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u16 reg;
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u16 lock_reg;
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u32 prediv;
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unsigned long features;
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spinlock_t *lock;
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struct clk_hw hw;
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};
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static inline struct ccu_common *hw_to_ccu_common(struct clk_hw *hw)
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{
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return container_of(hw, struct ccu_common, hw);
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}
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struct sunxi_ccu_desc {
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struct ccu_common **ccu_clks;
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unsigned long num_ccu_clks;
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struct clk_hw_onecell_data *hw_clks;
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struct ccu_reset_map *resets;
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unsigned long num_resets;
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};
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void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock);
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struct ccu_pll_nb {
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struct notifier_block clk_nb;
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struct ccu_common *common;
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u32 enable;
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u32 lock;
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};
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#define to_ccu_pll_nb(_nb) container_of(_nb, struct ccu_pll_nb, clk_nb)
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int ccu_pll_notifier_register(struct ccu_pll_nb *pll_nb);
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int sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
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const struct sunxi_ccu_desc *desc);
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#endif /* _COMMON_H_ */
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