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Fri, 1 Feb 2019 16:22:08 +0800 Message-ID: <1549009328.22634.1.camel@mtksdaap41> Subject: Re: [PATCH v3 02/12] clk: mediatek: add new clkmux register API From: Weiyi Lu To: Nicolas Boichat Date: Fri, 1 Feb 2019 16:22:08 +0800 In-Reply-To: References: <20181210073240.32278-1-weiyi.lu@mediatek.com> <20181210073240.32278-4-weiyi.lu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: EB3C8BBCE186FCC59C3C76758C13B0AC344A8F16D6A0678DF507DD19BBD2E1A52000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190201_002702_352608_752D2726 X-CRM114-Status: GOOD ( 24.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , srv_heupstream@mediatek.com, jamesjj.liao@mediatek.com, sboyd@codeaurora.org, lkml , stable@vger.kernel.org, Fan Chen , linux-mediatek@lists.infradead.org, Matthias Brugger , owen.chen@mediatek.com, linux-clk@vger.kernel.org, linux-arm Mailing List Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2018-12-10 at 20:30 +0800, Nicolas Boichat wrote: > On Mon, Dec 10, 2018 at 3:33 PM Weiyi Lu wrote: > > > > From: Owen Chen > > > > On both MT8183 & MT6765, there add "set/clr" register for > > each clkmux setting, and one update register to trigger value change. > > It is designed to prevent read-modify-write racing issue. > > The sw design need to add a new API to handle this hw change with > > a new mtk_clk_mux/mtk_mux struct in new file "clk-mux.c", "clk-mux.h". > > > > Signed-off-by: Owen Chen > > Signed-off-by: Weiyi Lu > > --- > > drivers/clk/mediatek/Makefile | 3 +- > > drivers/clk/mediatek/clk-mux.c | 229 +++++++++++++++++++++++++++++++++ > > drivers/clk/mediatek/clk-mux.h | 101 +++++++++++++++ > > 3 files changed, 332 insertions(+), 1 deletion(-) > > create mode 100644 drivers/clk/mediatek/clk-mux.c > > create mode 100644 drivers/clk/mediatek/clk-mux.h > > > > diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile > > index 844b55d2770d..00e4d405231e 100644 > > --- a/drivers/clk/mediatek/Makefile > > +++ b/drivers/clk/mediatek/Makefile > > @@ -1,5 +1,6 @@ > > # SPDX-License-Identifier: GPL-2.0 > > -obj-$(CONFIG_COMMON_CLK_MEDIATEK) += clk-mtk.o clk-pll.o clk-gate.o clk-apmixed.o clk-cpumux.o reset.o > > +obj-$(CONFIG_COMMON_CLK_MEDIATEK) += clk-mtk.o clk-pll.o clk-gate.o clk-apmixed.o clk-cpumux.o reset.o clk-mux.o > > + > > obj-$(CONFIG_COMMON_CLK_MT6797) += clk-mt6797.o > > obj-$(CONFIG_COMMON_CLK_MT6797_IMGSYS) += clk-mt6797-img.o > > obj-$(CONFIG_COMMON_CLK_MT6797_MMSYS) += clk-mt6797-mm.o > > diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c > > new file mode 100644 > > index 000000000000..efbbb35eb185 > > --- /dev/null > > +++ b/drivers/clk/mediatek/clk-mux.c > > @@ -0,0 +1,229 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Copyright (c) 2018 MediaTek Inc. > > + * Author: Owen Chen > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > + > > +#include "clk-mtk.h" > > +#include "clk-mux.h" > > + > > +static inline struct mtk_clk_mux *to_mtk_clk_mux(struct clk_hw *hw) > > +{ > > + return container_of(hw, struct mtk_clk_mux, hw); > > +} > > + > > +static int mtk_clk_mux_enable(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 mask = BIT(mux->gate_shift); > > + > > + return regmap_update_bits(mux->regmap, mux->mux_ofs, mask, ~mask); > > +} > > + > > +static void mtk_clk_mux_disable(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 mask = BIT(mux->gate_shift); > > + > > + regmap_update_bits(mux->regmap, mux->mux_ofs, mask, mask); > > +} > > + > > +static int mtk_clk_mux_enable_setclr(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + > > + return regmap_write(mux->regmap, mux->mux_clr_ofs, > > + BIT(mux->gate_shift)); > > +} > > + > > +static void mtk_clk_mux_disable_setclr(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + > > + regmap_write(mux->regmap, mux->mux_set_ofs, BIT(mux->gate_shift)); > > +} > > + > > +static int mtk_clk_mux_is_enabled(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 val; > > + > > + regmap_read(mux->regmap, mux->mux_ofs, &val); > > + > > + return (val & BIT(mux->gate_shift)) == 0; > > +} > > + > > +static u8 mtk_clk_mux_get_parent(struct clk_hw *hw) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 mask = GENMASK(mux->mux_width - 1, 0); > > + u32 val; > > + > > + regmap_read(mux->regmap, mux->mux_ofs, &val); > > + val = (val >> mux->mux_shift) & mask; > > + > > + return val; > > +} > > + > > +static int mtk_clk_mux_set_parent_lock(struct clk_hw *hw, u8 index) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 mask = GENMASK(mux->mux_width - 1, 0); > > + unsigned long flags; > > + > > + if (mux->lock) > > + spin_lock_irqsave(mux->lock, flags); > > + else > > + __acquire(mux->lock); > > + > > + regmap_update_bits(mux->regmap, mux->mux_ofs, mask, > > + index << mux->mux_shift); > > + > > + if (mux->lock) > > + spin_unlock_irqrestore(mux->lock, flags); > > + else > > + __release(mux->lock); > > + > > + return 0; > > +} > > + > > +static int mtk_clk_mux_set_parent_setclr_lock(struct clk_hw *hw, u8 index) > > +{ > > + struct mtk_clk_mux *mux = to_mtk_clk_mux(hw); > > + u32 mask = GENMASK(mux->mux_width - 1, 0); > > + u32 val, orig; > > + unsigned long flags; > > + > > + if (mux->lock) > > + spin_lock_irqsave(mux->lock, flags); > > + else > > + __acquire(mux->lock); > > + > > + regmap_read(mux->regmap, mux->mux_ofs, &orig); > > + val = (orig & ~(mask << mux->mux_shift)) | (index << mux->mux_shift); > > + > > + if (val != orig) { > > + regmap_write(mux->regmap, mux->mux_clr_ofs, > > + mask << mux->mux_shift); > > + regmap_write(mux->regmap, mux->mux_set_ofs, > > + index << mux->mux_shift); > > + > > + if (mux->upd_shift >= 0) > > + regmap_write(mux->regmap, mux->upd_ofs, > > + BIT(mux->upd_shift)); > > + } > > + > > + if (mux->lock) > > + spin_unlock_irqrestore(mux->lock, flags); > > + else > > + __release(mux->lock); > > + > > + return 0; > > +} > > + > > +const struct clk_ops mtk_mux_ops = { > > + .get_parent = mtk_clk_mux_get_parent, > > + .set_parent = mtk_clk_mux_set_parent_lock, > > +}; > > + > > +const struct clk_ops mtk_mux_clr_set_upd_ops = { > > + .get_parent = mtk_clk_mux_get_parent, > > + .set_parent = mtk_clk_mux_set_parent_setclr_lock, > > +}; > > + > > +const struct clk_ops mtk_mux_gate_ops = { > > + .enable = mtk_clk_mux_enable, > > + .disable = mtk_clk_mux_disable, > > + .is_enabled = mtk_clk_mux_is_enabled, > > + .get_parent = mtk_clk_mux_get_parent, > > + .set_parent = mtk_clk_mux_set_parent_lock, > > +}; > > + > > +const struct clk_ops mtk_mux_gate_clr_set_upd_ops = { > > + .enable = mtk_clk_mux_enable_setclr, > > + .disable = mtk_clk_mux_disable_setclr, > > + .is_enabled = mtk_clk_mux_is_enabled, > > + .get_parent = mtk_clk_mux_get_parent, > > + .set_parent = mtk_clk_mux_set_parent_setclr_lock, > > +}; > > + > > +struct clk *mtk_clk_register_mux(const struct mtk_mux *mux, > > + struct regmap *regmap, > > + spinlock_t *lock) > > +{ > > + struct mtk_clk_mux *mtk_mux; > > I'd call this variable clk_mux. > OK, I'll fix in next version. > > + struct clk_init_data init; > > + struct clk *clk; > > + > > + mtk_mux = kzalloc(sizeof(*mtk_mux), GFP_KERNEL); > > + if (!mtk_mux) > > + return ERR_PTR(-ENOMEM); > > + > > + init.name = mux->name; > > + init.flags = mux->flags | CLK_SET_RATE_PARENT; > > + init.parent_names = mux->parent_names; > > + init.num_parents = mux->num_parents; > > + init.ops = mux->ops; > > + > > + mtk_mux->regmap = regmap; > > + mtk_mux->name = mux->name; > > + mtk_mux->mux_ofs = mux->mux_ofs; > > + mtk_mux->mux_set_ofs = mux->set_ofs; > > + mtk_mux->mux_clr_ofs = mux->clr_ofs; > > + mtk_mux->upd_ofs = mux->upd_ofs; > > + mtk_mux->mux_shift = mux->mux_shift; > > + mtk_mux->mux_width = mux->mux_width; > > + mtk_mux->gate_shift = mux->gate_shift; > > + mtk_mux->upd_shift = mux->upd_shift; > > These copies seem a bit wasteful. If the lifetime of the objects are > the same, can you just keep a pointer to struct mtk_mux in struct > mtk_clk_mux? > > If not, maybe move all the settings to a "params" structure or > something like that, so we can do a simpler memcpy? > I'll make a change like below. struct mtk_clk_mux { struct clk_hw hw; struct regmap *regmap; const struct mtk_mux *data; spinlock_t *lock; }; and do mtk_mux->data = mux; directly. > > + > > + mtk_mux->lock = lock; > > + mtk_mux->hw.init = &init; > > + > > + clk = clk_register(NULL, &mtk_mux->hw); > > + if (IS_ERR(clk)) { > > + kfree(mtk_mux); > > + return clk; > > + } > > + > > + return clk; > > +} > > + > > +int mtk_clk_register_muxes(const struct mtk_mux *muxes, > > + int num, struct device_node *node, > > + spinlock_t *lock, > > + struct clk_onecell_data *clk_data) > > +{ > > + struct regmap *regmap; > > + struct clk *clk; > > + int i; > > + > > + regmap = syscon_node_to_regmap(node); > > + if (IS_ERR(regmap)) { > > + pr_err("Cannot find regmap for %pOF: %ld\n", node, > > + PTR_ERR(regmap)); > > + return PTR_ERR(regmap); > > + } > > + > > + for (i = 0; i < num; i++) { > > + const struct mtk_mux *mux = &muxes[i]; > > + > > + if (IS_ERR_OR_NULL(clk_data->clks[mux->id])) { > > + clk = mtk_clk_register_mux(mux, regmap, lock); > > + > > + if (IS_ERR(clk)) { > > + pr_err("Failed to register clk %s: %ld\n", > > + mux->name, PTR_ERR(clk)); > > + continue; > > + } > > + > > + clk_data->clks[mux->id] = clk; > > + } > > + } > > + > > + return 0; > > +} > > diff --git a/drivers/clk/mediatek/clk-mux.h b/drivers/clk/mediatek/clk-mux.h > > new file mode 100644 > > index 000000000000..830a6117e670 > > --- /dev/null > > +++ b/drivers/clk/mediatek/clk-mux.h > > @@ -0,0 +1,101 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (c) 2018 MediaTek Inc. > > + * Author: Owen Chen > > + */ > > + > > +#ifndef __DRV_CLK_MTK_MUX_H > > +#define __DRV_CLK_MTK_MUX_H > > + > > +#include > > + > > +struct mtk_clk_mux { > > + struct clk_hw hw; > > + struct regmap *regmap; > > + > > + const char *name; > > + > > + u32 mux_set_ofs; > > + u32 mux_clr_ofs; > > + u32 mux_ofs; > > + u32 upd_ofs; > > + > > + u8 mux_shift; > > + u8 mux_width; > > + u8 gate_shift; > > + s8 upd_shift; > > + > > + spinlock_t *lock; > > +}; > > + > > +struct mtk_mux { > > + int id; > > + const char *name; > > + const char * const *parent_names; > > + unsigned int flags; > > + > > + u32 mux_ofs; > > + u32 set_ofs; > > + u32 clr_ofs; > > + u32 upd_ofs; > > + > > + u8 mux_shift; > > + u8 mux_width; > > + u8 gate_shift; > > + s8 upd_shift; > > + > > + const struct clk_ops *ops; > > + > > + signed char num_parents; > > +}; > > + > > +extern const struct clk_ops mtk_mux_ops; > > +extern const struct clk_ops mtk_mux_clr_set_upd_ops; > > +extern const struct clk_ops mtk_mux_gate_ops; > > +extern const struct clk_ops mtk_mux_gate_clr_set_upd_ops; > > + > > +#define GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ > > + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ > > + _gate, _upd_ofs, _upd, _flags, _ops) { \ > > + .id = _id, \ > > + .name = _name, \ > > + .mux_ofs = _mux_ofs, \ > > + .set_ofs = _mux_set_ofs, \ > > + .clr_ofs = _mux_clr_ofs, \ > > + .upd_ofs = _upd_ofs, \ > > + .mux_shift = _shift, \ > > + .mux_width = _width, \ > > + .gate_shift = _gate, \ > > + .upd_shift = _upd, \ > > + .parent_names = _parents, \ > > + .num_parents = ARRAY_SIZE(_parents), \ > > + .flags = _flags, \ > > + .ops = &_ops, \ > > + } > > + > > +#define MUX_GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ > > + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ > > + _gate, _upd_ofs, _upd, _flags) \ > > + GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ > > + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ > > + _gate, _upd_ofs, _upd, _flags, \ > > + mtk_mux_gate_clr_set_upd_ops) > > + > > +#define MUX_GATE_CLR_SET_UPD(_id, _name, _parents, _mux_ofs, \ > > + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ > > + _gate, _upd_ofs, _upd) \ > > + MUX_GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, \ > > + _mux_ofs, _mux_set_ofs, _mux_clr_ofs, _shift, \ > > + _width, _gate, _upd_ofs, _upd, \ > > + CLK_SET_RATE_PARENT) > > + > > +struct clk *mtk_clk_register_mux(const struct mtk_mux *mux, > > + struct regmap *regmap, > > + spinlock_t *lock); > > + > > +int mtk_clk_register_muxes(const struct mtk_mux *muxes, > > + int num, struct device_node *node, > > + spinlock_t *lock, > > + struct clk_onecell_data *clk_data); > > + > > +#endif /* __DRV_CLK_MTK_MUX_H */ > > -- > > 2.18.0 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel