[PATCH 2/6] clk: mediatek: Add initial common clock support for Mediatek SoCs.
Matthias Brugger
matthias.bgg at gmail.com
Thu Apr 9 10:03:57 PDT 2015
2015-03-31 20:16 GMT+02:00 Sascha Hauer <s.hauer at pengutronix.de>:
> From: James Liao <jamesjj.liao at mediatek.com>
>
> This patch adds common clock support for Mediatek SoCs, including plls,
> muxes and clock gates.
>
> Signed-off-by: James Liao <jamesjj.liao at mediatek.com>
> Signed-off-by: Henry Chen <henryc.chen at mediatek.com>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
> drivers/clk/Makefile | 1 +
> drivers/clk/mediatek/Makefile | 1 +
> drivers/clk/mediatek/clk-gate.c | 137 ++++++++++++++++
> drivers/clk/mediatek/clk-gate.h | 49 ++++++
> drivers/clk/mediatek/clk-mtk.c | 197 +++++++++++++++++++++++
> drivers/clk/mediatek/clk-mtk.h | 155 +++++++++++++++++++
> drivers/clk/mediatek/clk-pll.c | 335 ++++++++++++++++++++++++++++++++++++++++
> 7 files changed, 875 insertions(+)
> create mode 100644 drivers/clk/mediatek/Makefile
> create mode 100644 drivers/clk/mediatek/clk-gate.c
> create mode 100644 drivers/clk/mediatek/clk-gate.h
> create mode 100644 drivers/clk/mediatek/clk-mtk.c
> create mode 100644 drivers/clk/mediatek/clk-mtk.h
> create mode 100644 drivers/clk/mediatek/clk-pll.c
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index d478ceb..6d97203 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -49,6 +49,7 @@ obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/
> obj-$(CONFIG_ARCH_HIP04) += hisilicon/
> obj-$(CONFIG_ARCH_HIX5HD2) += hisilicon/
> obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/
> +obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
> ifeq ($(CONFIG_COMMON_CLK), y)
> obj-$(CONFIG_ARCH_MMP) += mmp/
> endif
> diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> new file mode 100644
> index 0000000..c384e97
> --- /dev/null
> +++ b/drivers/clk/mediatek/Makefile
> @@ -0,0 +1 @@
> +obj-y += clk-mtk.o clk-pll.o clk-gate.o
> diff --git a/drivers/clk/mediatek/clk-gate.c b/drivers/clk/mediatek/clk-gate.c
> new file mode 100644
> index 0000000..9d77ee3
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-gate.c
> @@ -0,0 +1,137 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: James Liao <jamesjj.liao at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/clkdev.h>
> +
> +#include "clk-mtk.h"
> +#include "clk-gate.h"
> +
> +static int mtk_cg_bit_is_cleared(struct clk_hw *hw)
> +{
> + struct mtk_clk_gate *cg = to_clk_gate(hw);
> + u32 val;
> +
> + regmap_read(cg->regmap, cg->sta_ofs, &val);
> +
> + val &= BIT(cg->bit);
> +
> + return val == 0;
> +}
> +
> +static int mtk_cg_bit_is_set(struct clk_hw *hw)
> +{
> + struct mtk_clk_gate *cg = to_clk_gate(hw);
> + u32 val;
> +
> + regmap_read(cg->regmap, cg->sta_ofs, &val);
> +
> + val &= BIT(cg->bit);
> +
> + return val != 0;
> +}
> +
> +static void mtk_cg_set_bit(struct clk_hw *hw)
> +{
> + struct mtk_clk_gate *cg = to_clk_gate(hw);
> +
> + regmap_write(cg->regmap, cg->set_ofs, BIT(cg->bit));
> +}
> +
> +static void mtk_cg_clr_bit(struct clk_hw *hw)
> +{
> + struct mtk_clk_gate *cg = to_clk_gate(hw);
> +
> + regmap_write(cg->regmap, cg->clr_ofs, BIT(cg->bit));
> +}
> +
> +static int mtk_cg_enable(struct clk_hw *hw)
> +{
> + mtk_cg_clr_bit(hw);
> +
> + return 0;
> +}
> +
> +static void mtk_cg_disable(struct clk_hw *hw)
> +{
> + mtk_cg_set_bit(hw);
> +}
> +
> +static int mtk_cg_enable_inv(struct clk_hw *hw)
> +{
> + mtk_cg_set_bit(hw);
> +
> + return 0;
> +}
> +
> +static void mtk_cg_disable_inv(struct clk_hw *hw)
> +{
> + mtk_cg_clr_bit(hw);
> +}
> +
> +const struct clk_ops mtk_clk_gate_ops_setclr = {
> + .is_enabled = mtk_cg_bit_is_cleared,
> + .enable = mtk_cg_enable,
> + .disable = mtk_cg_disable,
> +};
> +
> +const struct clk_ops mtk_clk_gate_ops_setclr_inv = {
> + .is_enabled = mtk_cg_bit_is_set,
> + .enable = mtk_cg_enable_inv,
> + .disable = mtk_cg_disable_inv,
> +};
> +
> +struct clk *mtk_clk_register_gate(
> + const char *name,
> + const char *parent_name,
> + struct regmap *regmap,
> + int set_ofs,
> + int clr_ofs,
> + int sta_ofs,
> + u8 bit,
> + const struct clk_ops *ops)
> +{
> + struct mtk_clk_gate *cg;
> + struct clk *clk;
> + struct clk_init_data init;
> +
> + cg = kzalloc(sizeof(*cg), GFP_KERNEL);
> + if (!cg)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.flags = CLK_SET_RATE_PARENT;
> + init.parent_names = parent_name ? &parent_name : NULL;
> + init.num_parents = parent_name ? 1 : 0;
> + init.ops = ops;
> +
> + cg->regmap = regmap;
> + cg->set_ofs = set_ofs;
> + cg->clr_ofs = clr_ofs;
> + cg->sta_ofs = sta_ofs;
> + cg->bit = bit;
> +
> + cg->hw.init = &init;
> +
> + clk = clk_register(NULL, &cg->hw);
> + if (IS_ERR(clk))
> + kfree(cg);
> +
> + return clk;
> +}
> diff --git a/drivers/clk/mediatek/clk-gate.h b/drivers/clk/mediatek/clk-gate.h
> new file mode 100644
> index 0000000..6b6780b
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-gate.h
> @@ -0,0 +1,49 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: James Liao <jamesjj.liao at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#ifndef __DRV_CLK_GATE_H
> +#define __DRV_CLK_GATE_H
> +
> +#include <linux/regmap.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +
> +struct mtk_clk_gate {
> + struct clk_hw hw;
> + struct regmap *regmap;
> + int set_ofs;
> + int clr_ofs;
> + int sta_ofs;
> + u8 bit;
> +};
> +
> +static inline struct mtk_clk_gate *to_clk_gate(struct clk_hw *hw)
> +{
> + return container_of(hw, struct mtk_clk_gate, hw);
> +}
> +
> +extern const struct clk_ops mtk_clk_gate_ops_setclr;
> +extern const struct clk_ops mtk_clk_gate_ops_setclr_inv;
> +
> +struct clk *mtk_clk_register_gate(
> + const char *name,
> + const char *parent_name,
> + struct regmap *regmap,
> + int set_ofs,
> + int clr_ofs,
> + int sta_ofs,
> + u8 bit,
> + const struct clk_ops *ops);
> +
> +#endif /* __DRV_CLK_GATE_H */
> diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
> new file mode 100644
> index 0000000..746bb34
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -0,0 +1,197 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: James Liao <jamesjj.liao at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/clkdev.h>
> +#include <linux/mfd/syscon.h>
> +
> +#include "clk-mtk.h"
> +#include "clk-gate.h"
> +
> +struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num)
> +{
> + int i;
> + struct clk_onecell_data *clk_data;
> +
> + clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
> + if (!clk_data)
> + return NULL;
> +
> + clk_data->clks = kcalloc(clk_num, sizeof(*clk_data->clks), GFP_KERNEL);
> + if (!clk_data->clks)
> + goto err_out;
> +
> + clk_data->clk_num = clk_num;
> +
> + for (i = 0; i < clk_num; i++)
> + clk_data->clks[i] = ERR_PTR(-ENOENT);
> +
> + return clk_data;
> +err_out:
> + kfree(clk_data);
> +
> + return NULL;
> +}
> +
> +void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num,
> + struct clk_onecell_data *clk_data)
> +{
> + int i;
> + struct clk *clk;
> +
> + for (i = 0; i < num; i++) {
> + const struct mtk_fixed_factor *ff = &clks[i];
> +
> + clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name,
> + CLK_SET_RATE_PARENT, ff->mult, ff->div);
> +
> + if (IS_ERR(clk)) {
> + pr_err("Failed to register clk %s: %ld\n",
> + ff->name, PTR_ERR(clk));
> + continue;
> + }
> +
> + if (clk_data)
> + clk_data->clks[ff->id] = clk;
> + }
> +}
> +
> +int mtk_clk_register_gates(struct device_node *node, const struct mtk_gate *clks,
> + int num, struct clk_onecell_data *clk_data)
> +{
> + int i;
> + struct clk *clk;
> + struct regmap *regmap;
> +
> + if (!clk_data)
> + return -ENOMEM;
> +
> + regmap = syscon_node_to_regmap(node);
> + if (IS_ERR(regmap)) {
> + pr_err("Cannot find regmap for %s: %ld\n", node->full_name,
> + PTR_ERR(regmap));
> + return PTR_ERR(regmap);
> + }
> +
> + for (i = 0; i < num; i++) {
> + const struct mtk_gate *gate = &clks[i];
> +
> + clk = mtk_clk_register_gate(gate->name, gate->parent_name,
> + regmap,
> + gate->regs->set_ofs,
> + gate->regs->clr_ofs,
> + gate->regs->sta_ofs,
> + gate->shift, gate->ops);
> +
> + if (IS_ERR(clk)) {
> + pr_err("Failed to register clk %s: %ld\n",
> + gate->name, PTR_ERR(clk));
> + continue;
> + }
> +
> + clk_data->clks[gate->id] = clk;
> + }
> +
> + return 0;
> +}
> +
> +struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
> + void __iomem *base, spinlock_t *lock)
> +{
> + struct clk *clk;
> + struct clk_mux *mux = NULL;
> + struct clk_gate *gate = NULL;
> + struct clk_divider *div = NULL;
> + struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *div_hw = NULL;
> + const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, *div_ops = NULL;
> + const char * const *parent_names;
> + const char *parent;
> + int num_parents;
> + int ret;
> +
> + if (mc->mux_shift >= 0) {
> + mux = kzalloc(sizeof(*mux), GFP_KERNEL);
> + if (!mux)
> + return ERR_PTR(-ENOMEM);
> +
> + mux->reg = base + mc->mux_reg;
> + mux->mask = BIT(mc->mux_width) - 1;
> + mux->shift = mc->mux_shift;
> + mux->lock = lock;
> +
> + mux_hw = &mux->hw;
> + mux_ops = &clk_mux_ops;
> +
> + parent_names = mc->parent_names;
> + num_parents = mc->num_parents;
> + } else {
> + parent = mc->parent;
> + parent_names = &parent;
> + num_parents = 1;
> + }
> +
> + if (mc->gate_shift >= 0) {
> + gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> + if (!gate) {
> + ret = -ENOMEM;
> + goto err_out;
> + }
> +
> + gate->reg = base + mc->gate_reg;
> + gate->bit_idx = mc->gate_shift;
> + gate->flags = CLK_GATE_SET_TO_DISABLE;
> + gate->lock = lock;
> +
> + gate_hw = &gate->hw;
> + gate_ops = &clk_gate_ops;
> + }
> +
> + if (mc->divider_shift >= 0) {
> + div = kzalloc(sizeof(*div), GFP_KERNEL);
> + if (!div) {
> + ret = -ENOMEM;
> + goto err_out;
> + }
> +
> + div->reg = base + mc->divider_reg;
> + div->shift = mc->divider_shift;
> + div->width = mc->divider_width;
> + div->lock = lock;
> +
> + div_hw = &div->hw;
> + div_ops = &clk_divider_ops;
> + }
> +
> + clk = clk_register_composite(NULL, mc->name, parent_names, num_parents,
> + mux_hw, mux_ops,
> + div_hw, div_ops,
> + gate_hw, gate_ops,
> + mc->flags);
> +
> + if (IS_ERR(clk)) {
> + kfree(gate);
> + kfree(mux);
> + }
> +
> + return clk;
> +err_out:
> + kfree(mux);
> +
> + return ERR_PTR(ret);
> +}
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> new file mode 100644
> index 0000000..5aaba81
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: James Liao <jamesjj.liao at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#ifndef __DRV_CLK_MTK_H
> +#define __DRV_CLK_MTK_H
> +
> +#include <linux/regmap.h>
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +
> +#define MAX_MUX_GATE_BIT 31
> +#define INVALID_MUX_GATE_BIT (MAX_MUX_GATE_BIT + 1)
> +
> +#define MHZ (1000 * 1000)
> +
> +struct mtk_fixed_factor {
> + int id;
> + const char *name;
> + const char *parent_name;
> + int mult;
> + int div;
> +};
> +
> +#define FACTOR(_id, _name, _parent, _mult, _div) { \
> + .id = _id, \
> + .name = _name, \
> + .parent_name = _parent, \
> + .mult = _mult, \
> + .div = _div, \
> + }
> +
> +extern void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
> + int num, struct clk_onecell_data *clk_data);
> +
> +struct mtk_composite {
> + int id;
> + const char *name;
> + const char * const * parent_names;
> + const char *parent;
> + unsigned flags;
> +
> + uint32_t mux_reg;
> + uint32_t divider_reg;
> + uint32_t gate_reg;
> +
> + signed char mux_shift;
> + signed char mux_width;
> + signed char gate_shift;
> +
> + signed char divider_shift;
> + signed char divider_width;
> +
> + signed char num_parents;
> +};
> +
> +#define MUX_GATE(_id, _name, _parents, _reg, _shift, _width, _gate) { \
> + .id = _id, \
> + .name = _name, \
> + .mux_reg = _reg, \
> + .mux_shift = _shift, \
> + .mux_width = _width, \
> + .gate_reg = _reg, \
> + .gate_shift = _gate, \
> + .divider_shift = -1, \
> + .parent_names = _parents, \
> + .num_parents = ARRAY_SIZE(_parents), \
> + .flags = CLK_SET_RATE_PARENT, \
> + }
> +
> +#define MUX(_id, _name, _parents, _reg, _shift, _width) { \
> + .id = _id, \
> + .name = _name, \
> + .mux_reg = _reg, \
> + .mux_shift = _shift, \
> + .mux_width = _width, \
> + .gate_shift = -1, \
> + .divider_shift = -1, \
> + .parent_names = _parents, \
> + .num_parents = ARRAY_SIZE(_parents), \
> + .flags = CLK_SET_RATE_PARENT, \
> + }
> +
> +#define DIV_GATE(_id, _name, _parent, _gate_reg, _gate_shift, _div_reg, _div_width, _div_shift) { \
> + .id = _id, \
> + .parent = _parent, \
> + .name = _name, \
> + .divider_reg = _div_reg, \
> + .divider_shift = _div_shift, \
> + .divider_width = _div_width, \
> + .gate_reg = _gate_reg, \
> + .gate_shift = _gate_shift, \
> + .mux_shift = -1, \
> + .flags = 0, \
> + }
> +
> +struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
> + void __iomem *base, spinlock_t *lock);
> +
> +struct mtk_gate_regs {
> + u32 sta_ofs;
> + u32 clr_ofs;
> + u32 set_ofs;
> +};
> +
> +struct mtk_gate {
> + int id;
> + const char *name;
> + const char *parent_name;
> + const struct mtk_gate_regs *regs;
> + int shift;
> + const struct clk_ops *ops;
> +};
> +
> +int mtk_clk_register_gates(struct device_node *node, const struct mtk_gate *clks,
> + int num, struct clk_onecell_data *clk_data);
> +
> +struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num);
> +
> +#define HAVE_RST_BAR BIT(0)
> +
> +struct mtk_pll_data {
> + int id;
> + const char *name;
> + uint32_t reg;
> + uint32_t pwr_reg;
> + uint32_t en_mask;
> + uint32_t pd_reg;
> + uint32_t tuner_reg;
> + int pd_shift;
> + unsigned int flags;
> + const struct clk_ops *ops;
> + u32 rst_bar_mask;
> + unsigned long fmax;
> + int pcwbits;
> + uint32_t pcw_reg;
> + int pcw_shift;
> +};
> +
> +void __init mtk_clk_register_plls(struct device_node *node,
> + const struct mtk_pll_data *plls, int num_plls,
> + struct clk_onecell_data *clk_data);
> +
> +#endif /* __DRV_CLK_MTK_H */
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> new file mode 100644
> index 0000000..3ef6b21
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -0,0 +1,335 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: James Liao <jamesjj.liao at mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/clkdev.h>
> +#include <linux/delay.h>
> +
> +#include "clk-mtk.h"
> +
> +#define REG_CON0 0
> +#define REG_CON1 4
> +
> +#define CON0_BASE_EN BIT(0)
> +#define CON0_PWR_ON BIT(0)
> +#define CON0_ISO_EN BIT(1)
> +#define CON0_PCW_CHG BIT(31)
> +
> +#define AUDPLL_TUNER_EN BIT(31)
> +
> +#define POSTDIV_MASK 0x7
> +#define INTEGER_BITS 7
> +
> +/*
> + * MediaTek PLLs are configured through their pcw value. The pcw value describes
> + * a divider in the PLL feedback loop which consists of 7 bits for the integer
> + * part and the remaining bits (if present) for the fractional part. Also they
> + * have a 3 bit power-of-two post divider.
> + */
> +
> +struct mtk_clk_pll {
> + struct clk_hw hw;
> + void __iomem *base_addr;
> + void __iomem *pd_addr;
> + void __iomem *pwr_addr;
> + void __iomem *tuner_addr;
> + void __iomem *pcw_addr;
> + const struct mtk_pll_data *data;
> +};
> +
> +static inline struct mtk_clk_pll *to_mtk_clk_pll(struct clk_hw *hw)
> +{
> + return container_of(hw, struct mtk_clk_pll, hw);
> +}
> +
> +static int mtk_pll_is_prepared(struct clk_hw *hw)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> +
> + return (readl(pll->base_addr + REG_CON0) & CON0_BASE_EN) != 0;
> +}
> +
> +static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
> + u32 pcw, int postdiv)
> +{
> + int pcwbits = pll->data->pcwbits;
> + int pcwfbits;
> + u64 vco;
> + u8 c = 0;
> +
> + /* The fractional part of the PLL divider. */
> + pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
> +
> + vco = (u64)fin * pcw;
> +
> + if (pcwfbits && (vco & GENMASK(pcwfbits - 1, 0)))
> + c = 1;
> +
> + vco >>= pcwfbits;
> +
> + if (c)
> + vco++;
> +
> + return ((unsigned long)vco + postdiv - 1) / postdiv;
> +}
> +
> +static void mtk_pll_set_rate_regs(struct clk_hw *hw, u32 pcw,
> + int postdiv)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
>From mtk_pll_set_rate we can pass a pointer to mtk_clk_pll instead of clk_hw.
> + u32 con1, pd, val;
> + int pll_en;
> +
> + /* set postdiv */
> + pd = readl(pll->pd_addr);
> + pd &= ~(POSTDIV_MASK << pll->data->pd_shift);
> + pd |= (ffs(postdiv) - 1) << pll->data->pd_shift;
> + writel(pd, pll->pd_addr);
> +
> + pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
> +
> + /* set pcw */
> + val = readl(pll->pcw_addr);
> +
> + val &= ~GENMASK(pll->data->pcw_shift + pll->data->pcwbits - 1,
> + pll->data->pcw_shift);
> + val |= pcw << pll->data->pcw_shift;
> + writel(val, pll->pcw_addr);
> +
> + con1 = readl(pll->base_addr + REG_CON1);
> +
> + if (pll_en)
> + con1 |= CON0_PCW_CHG;
> +
> + writel(con1, pll->base_addr + REG_CON1);
> + if (pll->tuner_addr)
> + writel(con1 + 1, pll->tuner_addr);
> +
> + if (pll_en)
> + usleep_range(20, 1000);
> +}
> +
> +/*
> + * mtk_pll_calc_values - calculate good values for a given input frequency.
> + * @pll: The pll
> + * @pcw: The pcw value (output)
> + * @postdiv: The post divider (output)
> + * @freq: The desired target frequency
> + * @fin: The input frequency
> + *
> + */
> +static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
> + u32 freq, u32 fin)
> +{
> + unsigned long fmin = 1000 * MHZ;
> + u64 _pcw;
> + u32 val;
> +
> + if (freq > pll->data->fmax)
> + freq = pll->data->fmax;
> +
> + for (val = 0; val < 4; val++) {
> + *postdiv = 1 << val;
> + if (freq * *postdiv >= fmin)
> + break;
> + }
> +
> + /* _pcw = freq * postdiv / fin * 2^pcwfbits */
> + _pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
> + do_div(_pcw, fin);
> +
> + *pcw = (u32)_pcw;
> +}
> +
> +static int mtk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> + u32 pcw = 0;
> + u32 postdiv;
> +
> + mtk_pll_calc_values(pll, &pcw, &postdiv, rate, parent_rate);
> + mtk_pll_set_rate_regs(hw, pcw, postdiv);
> +
> + return 0;
> +}
> +
> +static unsigned long mtk_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> + u32 postdiv;
> + u32 pcw;
> +
> + postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
> + postdiv = 1 << postdiv;
> +
> + pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
> + pcw &= GENMASK(pll->data->pcwbits - 1, 0);
> +
> + return __mtk_pll_recalc_rate(pll, parent_rate, pcw, postdiv);
> +}
> +
> +static long mtk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *prate)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> + u32 pcw = 0;
> + int postdiv;
> +
> + mtk_pll_calc_values(pll, &pcw, &postdiv, rate, *prate);
> +
> + return __mtk_pll_recalc_rate(pll, *prate, pcw, postdiv);
> +}
> +
> +static int mtk_pll_prepare(struct clk_hw *hw)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> + u32 r;
> +
> + r = readl(pll->pwr_addr) | CON0_PWR_ON;
> + writel(r, pll->pwr_addr);
> + usleep_range(1, 100);
> +
> + r = readl(pll->pwr_addr) & ~CON0_ISO_EN;
> + writel(r, pll->pwr_addr);
> + usleep_range(1, 100);
> +
> + r = readl(pll->base_addr + REG_CON0);
> + r |= pll->data->en_mask;
> + writel(r, pll->base_addr + REG_CON0);
> +
> + if (pll->tuner_addr) {
> + r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
> + writel(r, pll->tuner_addr);
> + }
> +
> + usleep_range(20, 1000);
> +
> + if (pll->data->flags & HAVE_RST_BAR) {
> + r = readl(pll->base_addr + REG_CON0);
> + r |= pll->data->rst_bar_mask;
> + writel(r, pll->base_addr + REG_CON0);
> + }
> +
> + return 0;
> +}
> +
> +static void mtk_pll_unprepare(struct clk_hw *hw)
> +{
> + struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
> + u32 r;
> +
> + if (pll->data->flags & HAVE_RST_BAR) {
> + r = readl(pll->base_addr + REG_CON0);
> + r &= ~pll->data->rst_bar_mask;
> + writel(r, pll->base_addr + REG_CON0);
> + }
> +
> + if (pll->tuner_addr) {
> + r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
> + writel(r, pll->tuner_addr);
> + }
> +
> + r = readl(pll->base_addr + REG_CON0);
> + r &= ~CON0_BASE_EN;
> + writel(r, pll->base_addr + REG_CON0);
> +
> + r = readl(pll->pwr_addr) | CON0_ISO_EN;
> + writel(r, pll->pwr_addr);
> +
> + r = readl(pll->pwr_addr) & ~CON0_PWR_ON;
> + writel(r, pll->pwr_addr);
> +}
> +
> +static const struct clk_ops mtk_pll_ops = {
> + .is_prepared = mtk_pll_is_prepared,
> + .prepare = mtk_pll_prepare,
> + .unprepare = mtk_pll_unprepare,
> + .recalc_rate = mtk_pll_recalc_rate,
> + .round_rate = mtk_pll_round_rate,
> + .set_rate = mtk_pll_set_rate,
> +};
> +
> +static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
> + void __iomem *base)
> +{
> + struct mtk_clk_pll *pll;
> + struct clk_init_data init;
> + struct clk *clk;
> + const char *parent_name = "clk26m";
> +
> + pr_debug("%s(): name: %s\n", __func__, data->name);
Please please make this more descriptive or delete the debug message.
> +
> + pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> + if (!pll)
> + return ERR_PTR(-ENOMEM);
> +
> + pll->base_addr = base + data->reg;
> + pll->pwr_addr = base + data->pwr_reg;
> + pll->pd_addr = base + data->pd_reg;
> + pll->pcw_addr = base + data->pcw_reg;
> + if (data->tuner_reg)
> + pll->tuner_addr = base + data->tuner_reg;
> + pll->hw.init = &init;
> + pll->data = data;
> +
> + init.name = data->name;
> + init.ops = &mtk_pll_ops;
> + init.parent_names = &parent_name;
> + init.num_parents = 1;
> +
> + clk = clk_register(NULL, &pll->hw);
> +
> + if (IS_ERR(clk))
> + kfree(pll);
> +
> + return clk;
> +}
> +
> +void __init mtk_clk_register_plls(struct device_node *node,
> + const struct mtk_pll_data *plls, int num_plls, struct clk_onecell_data *clk_data)
> +{
> + void __iomem *base;
> + int r, i;
> + struct clk *clk;
> +
> + base = of_iomap(node, 0);
> + if (!base) {
> + pr_err("%s(): ioremap failed\n", __func__);
> + return;
> + }
> +
> + for (i = 0; i < num_plls; i++) {
> + const struct mtk_pll_data *pll = &plls[i];
> +
> + clk = mtk_clk_register_pll(pll, base);
> +
> + if (IS_ERR(clk)) {
> + pr_err("Failed to register clk %s: %ld\n",
> + pll->name, PTR_ERR(clk));
> + continue;
> + }
> +
> + clk_data->clks[pll->id] = clk;
> + }
> +
> + r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
> + if (r)
> + pr_err("%s(): could not register clock provider: %d\n",
> + __func__, r);
> +}
> --
> 2.1.4
>
--
motzblog.wordpress.com
More information about the linux-arm-kernel
mailing list