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dc8797e39f
All of our MMC clocks are of the MP clock type. A few MMC clocks on some SoCs, such as MMC2 on the A83T, support new/old timing mode switching. >From a clock rate point of view, when the new timing mode is active. the output clock rate is halved. This patch adds a special wrapper class of clocks, MP_MMC, around the generic MP type clocks. The rate related callbacks in ccu_mp_mmc_ops for this class look at the timing mode bit and apply the /2 post-divider when needed, before passing it through to the generic class ops, ccu_mp_ops. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
108 lines
3.0 KiB
C
108 lines
3.0 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 _CCU_MP_H_
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#define _CCU_MP_H_
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#include <linux/bitops.h>
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#include <linux/clk-provider.h>
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#include "ccu_common.h"
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#include "ccu_div.h"
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#include "ccu_mult.h"
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#include "ccu_mux.h"
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/*
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* struct ccu_mp - Definition of an M-P clock
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*
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* Clocks based on the formula parent >> P / M
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*/
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struct ccu_mp {
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u32 enable;
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struct ccu_div_internal m;
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struct ccu_div_internal p;
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struct ccu_mux_internal mux;
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struct ccu_common common;
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};
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#define SUNXI_CCU_MP_WITH_MUX_GATE(_struct, _name, _parents, _reg, \
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_mshift, _mwidth, \
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_pshift, _pwidth, \
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_muxshift, _muxwidth, \
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_gate, _flags) \
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struct ccu_mp _struct = { \
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.enable = _gate, \
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.m = _SUNXI_CCU_DIV(_mshift, _mwidth), \
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.p = _SUNXI_CCU_DIV(_pshift, _pwidth), \
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.mux = _SUNXI_CCU_MUX(_muxshift, _muxwidth), \
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.common = { \
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.reg = _reg, \
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.hw.init = CLK_HW_INIT_PARENTS(_name, \
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_parents, \
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&ccu_mp_ops, \
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_flags), \
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} \
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}
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#define SUNXI_CCU_MP_WITH_MUX(_struct, _name, _parents, _reg, \
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_mshift, _mwidth, \
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_pshift, _pwidth, \
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_muxshift, _muxwidth, \
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_flags) \
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SUNXI_CCU_MP_WITH_MUX_GATE(_struct, _name, _parents, _reg, \
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_mshift, _mwidth, \
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_pshift, _pwidth, \
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_muxshift, _muxwidth, \
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0, _flags)
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static inline struct ccu_mp *hw_to_ccu_mp(struct clk_hw *hw)
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{
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struct ccu_common *common = hw_to_ccu_common(hw);
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return container_of(common, struct ccu_mp, common);
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}
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extern const struct clk_ops ccu_mp_ops;
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/*
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* Special class of M-P clock that supports MMC timing modes
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*
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* Since the MMC clock registers all follow the same layout, we can
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* simplify the macro for this particular case. In addition, as
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* switching modes also affects the output clock rate, we need to
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* have CLK_GET_RATE_NOCACHE for all these types of clocks.
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*/
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#define SUNXI_CCU_MP_MMC_WITH_MUX_GATE(_struct, _name, _parents, _reg, \
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_flags) \
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struct ccu_mp _struct = { \
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.enable = BIT(31), \
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.m = _SUNXI_CCU_DIV(0, 4), \
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.p = _SUNXI_CCU_DIV(16, 2), \
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.mux = _SUNXI_CCU_MUX(24, 2), \
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.common = { \
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.reg = _reg, \
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.features = CCU_FEATURE_MMC_TIMING_SWITCH, \
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.hw.init = CLK_HW_INIT_PARENTS(_name, \
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_parents, \
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&ccu_mp_mmc_ops, \
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CLK_GET_RATE_NOCACHE | \
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_flags), \
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} \
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}
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extern const struct clk_ops ccu_mp_mmc_ops;
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#endif /* _CCU_MP_H_ */
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