The VCLK and VCLK_DIV clocks have supplementary bits. The VCLK gate has a "SOFT RESET" bit to toggle after the whole VCLK sub-tree rate has been set, this is implemented in the gate enable callback.
The VCLK_DIV clocks as enable and reset bits used to disable and reset the divider, associated with CLK_SET_RATE_GATE it ensures the rate is set while the divider is disabled and in reset mode. The VCLK_DIV enable bit isn't implemented as a gate since it's part of the divider logic and vendor does this exact sequence to ensure the divider is correctly set. Signed-off-by: Neil Armstrong <neil.armstr...@linaro.org> --- drivers/clk/meson/Kconfig | 4 ++ drivers/clk/meson/Makefile | 1 + drivers/clk/meson/vclk.c | 141 +++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/meson/vclk.h | 51 ++++++++++++++++ 4 files changed, 197 insertions(+) diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig index 29ffd14d267b..8a9823789fa3 100644 --- a/drivers/clk/meson/Kconfig +++ b/drivers/clk/meson/Kconfig @@ -30,6 +30,10 @@ config COMMON_CLK_MESON_VID_PLL_DIV tristate select COMMON_CLK_MESON_REGMAP +config COMMON_CLK_MESON_VCLK + tristate + select COMMON_CLK_MESON_REGMAP + config COMMON_CLK_MESON_CLKC_UTILS tristate diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index 9ee4b954c896..9ba43fe7a07a 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK_MESON_PLL) += clk-pll.o obj-$(CONFIG_COMMON_CLK_MESON_REGMAP) += clk-regmap.o obj-$(CONFIG_COMMON_CLK_MESON_SCLK_DIV) += sclk-div.o obj-$(CONFIG_COMMON_CLK_MESON_VID_PLL_DIV) += vid-pll-div.o +obj-$(CONFIG_COMMON_CLK_MESON_VCLK) += vclk.o # Amlogic Clock controllers diff --git a/drivers/clk/meson/vclk.c b/drivers/clk/meson/vclk.c new file mode 100644 index 000000000000..3ea813a0a995 --- /dev/null +++ b/drivers/clk/meson/vclk.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2024 Neil Armstrong <neil.armstr...@linaro.org> + */ + +#include <linux/module.h> +#include "vclk.h" + +/* The VCLK gate has a supplementary reset bit to pulse after ungating */ + +static inline struct meson_vclk_gate_data * +clk_get_meson_vclk_gate_data(struct clk_regmap *clk) +{ + return (struct meson_vclk_gate_data *)clk->data; +} + +static int meson_vclk_gate_enable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_gate_data *vclk = clk_get_meson_vclk_gate_data(clk); + + meson_parm_write(clk->map, &vclk->enable, 1); + + /* Do a reset pulse */ + meson_parm_write(clk->map, &vclk->reset, 1); + meson_parm_write(clk->map, &vclk->reset, 0); + + return 0; +} + +static void meson_vclk_gate_disable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_gate_data *vclk = clk_get_meson_vclk_gate_data(clk); + + meson_parm_write(clk->map, &vclk->enable, 0); +} + +static int meson_vclk_gate_is_enabled(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_gate_data *vclk = clk_get_meson_vclk_gate_data(clk); + + return meson_parm_read(clk->map, &vclk->enable); +} + +const struct clk_ops meson_vclk_gate_ops = { + .enable = meson_vclk_gate_enable, + .disable = meson_vclk_gate_disable, + .is_enabled = meson_vclk_gate_is_enabled, +}; +EXPORT_SYMBOL_GPL(meson_vclk_gate_ops); + +/* The VCLK Divider has supplementary reset & enable bits */ + +static inline struct meson_vclk_div_data * +clk_get_meson_vclk_div_data(struct clk_regmap *clk) +{ + return (struct meson_vclk_div_data *)clk->data; +} + +static unsigned long meson_vclk_div_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + + return divider_recalc_rate(hw, prate, meson_parm_read(clk->map, &vclk->div), + vclk->table, vclk->flags, vclk->div.width); +} + +static int meson_vclk_div_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + + return divider_determine_rate(hw, req, vclk->table, vclk->div.width, + vclk->flags); +} + +static int meson_vclk_div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + int ret; + + ret = divider_get_val(rate, parent_rate, vclk->table, vclk->div.width, + vclk->flags); + if (ret < 0) + return ret; + + meson_parm_write(clk->map, &vclk->div, ret); + + return 0; +}; + +static int meson_vclk_div_enable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + + /* Unreset the divider when ungating */ + meson_parm_write(clk->map, &vclk->reset, 0); + meson_parm_write(clk->map, &vclk->enable, 1); + + return 0; +} + +static void meson_vclk_div_disable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + + /* Reset the divider when gating */ + meson_parm_write(clk->map, &vclk->enable, 0); + meson_parm_write(clk->map, &vclk->reset, 1); +} + +static int meson_vclk_div_is_enabled(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_vclk_div_data *vclk = clk_get_meson_vclk_div_data(clk); + + return meson_parm_read(clk->map, &vclk->enable); +} + +const struct clk_ops meson_vclk_div_ops = { + .recalc_rate = meson_vclk_div_recalc_rate, + .determine_rate = meson_vclk_div_determine_rate, + .set_rate = meson_vclk_div_set_rate, + .enable = meson_vclk_div_enable, + .disable = meson_vclk_div_disable, + .is_enabled = meson_vclk_div_is_enabled, +}; +EXPORT_SYMBOL_GPL(meson_vclk_div_ops); + +MODULE_DESCRIPTION("Amlogic vclk clock driver"); +MODULE_AUTHOR("Neil Armstrong <neil.armstr...@linaro.org>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/clk/meson/vclk.h b/drivers/clk/meson/vclk.h new file mode 100644 index 000000000000..20b0b181db09 --- /dev/null +++ b/drivers/clk/meson/vclk.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Neil Armstrong <neil.armstr...@linaro.org> + */ + +#ifndef __VCLK_H +#define __VCLK_H + +#include "clk-regmap.h" +#include "parm.h" + +/** + * struct meson_vclk_gate_data - vclk_gate regmap backed specific data + * + * @enable: vclk enable field + * @reset: vclk reset field + * @flags: hardware-specific flags + * + * Flags: + * Same as clk_gate except CLK_GATE_HIWORD_MASK which is ignored + */ +struct meson_vclk_gate_data { + struct parm enable; + struct parm reset; + u8 flags; +}; + +extern const struct clk_ops meson_vclk_gate_ops; + +/** + * struct meson_vclk_div_data - vclk_div regmap back specific data + * + * @div: divider field + * @enable: vclk divider enable field + * @reset: vclk divider reset field + * @table: array of value/divider pairs, last entry should have div = 0 + * + * Flags: + * Same as clk_divider except CLK_DIVIDER_HIWORD_MASK which is ignored + */ +struct meson_vclk_div_data { + struct parm div; + struct parm enable; + struct parm reset; + const struct clk_div_table *table; + u8 flags; +}; + +extern const struct clk_ops meson_vclk_div_ops; + +#endif /* __VCLK_H */ -- 2.34.1