diff options
author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2016-08-30 08:38:07 (GMT) |
---|---|---|
committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2016-09-10 09:41:19 (GMT) |
commit | aa152335174825fa4b4cd9af0564774b61857898 (patch) | |
tree | 6028c35619adbea51dd7fcec826228687d2bf006 /drivers/clk | |
parent | 13e91e4583973dff44c5cedc83b318f6518a58f0 (diff) | |
download | linux-aa152335174825fa4b4cd9af0564774b61857898.tar.xz |
clk: sunxi-ng: Add N-class clocks support
Add support for the class with a single factor, N, being a multiplier.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/sunxi-ng/Kconfig | 4 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_mult.c | 133 | ||||
-rw-r--r-- | drivers/clk/sunxi-ng/ccu_mult.h | 35 |
4 files changed, 173 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig index a1dee86..c725877 100644 --- a/drivers/clk/sunxi-ng/Kconfig +++ b/drivers/clk/sunxi-ng/Kconfig @@ -19,6 +19,10 @@ config SUNXI_CCU_GATE config SUNXI_CCU_MUX bool +config SUNXI_CCU_MULT + bool + select SUNXI_CCU_MUX + config SUNXI_CCU_PHASE bool diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile index 261438b..462a5f8 100644 --- a/drivers/clk/sunxi-ng/Makefile +++ b/drivers/clk/sunxi-ng/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_SUNXI_CCU_DIV) += ccu_div.o obj-$(CONFIG_SUNXI_CCU_FRAC) += ccu_frac.o obj-$(CONFIG_SUNXI_CCU_GATE) += ccu_gate.o obj-$(CONFIG_SUNXI_CCU_MUX) += ccu_mux.o +obj-$(CONFIG_SUNXI_CCU_MULT) += ccu_mult.o obj-$(CONFIG_SUNXI_CCU_PHASE) += ccu_phase.o # Multi-factor clocks diff --git a/drivers/clk/sunxi-ng/ccu_mult.c b/drivers/clk/sunxi-ng/ccu_mult.c new file mode 100644 index 0000000..010e942 --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_mult.c @@ -0,0 +1,133 @@ +/* + * Copyright (C) 2016 Maxime Ripard + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +#include <linux/clk-provider.h> + +#include "ccu_gate.h" +#include "ccu_mult.h" + +static void ccu_mult_find_best(unsigned long parent, unsigned long rate, + unsigned int max_n, unsigned int *n) +{ + *n = rate / parent; +} + +static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux, + unsigned long parent_rate, + unsigned long rate, + void *data) +{ + struct ccu_mult *cm = data; + unsigned int n; + + ccu_mult_find_best(parent_rate, rate, 1 << cm->mult.width, &n); + + return parent_rate * n; +} + +static void ccu_mult_disable(struct clk_hw *hw) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_gate_helper_disable(&cm->common, cm->enable); +} + +static int ccu_mult_enable(struct clk_hw *hw) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_gate_helper_enable(&cm->common, cm->enable); +} + +static int ccu_mult_is_enabled(struct clk_hw *hw) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_gate_helper_is_enabled(&cm->common, cm->enable); +} + +static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + unsigned long val; + u32 reg; + + reg = readl(cm->common.base + cm->common.reg); + val = reg >> cm->mult.shift; + val &= (1 << cm->mult.width) - 1; + + ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1, + &parent_rate); + + return parent_rate * (val + 1); +} + +static int ccu_mult_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_mux_helper_determine_rate(&cm->common, &cm->mux, + req, ccu_mult_round_rate, cm); +} + +static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + unsigned long flags; + unsigned int n; + u32 reg; + + ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1, + &parent_rate); + + ccu_mult_find_best(parent_rate, rate, 1 << cm->mult.width, &n); + + spin_lock_irqsave(cm->common.lock, flags); + + reg = readl(cm->common.base + cm->common.reg); + reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift); + + writel(reg | ((n - 1) << cm->mult.shift), + cm->common.base + cm->common.reg); + + spin_unlock_irqrestore(cm->common.lock, flags); + + return 0; +} + +static u8 ccu_mult_get_parent(struct clk_hw *hw) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_mux_helper_get_parent(&cm->common, &cm->mux); +} + +static int ccu_mult_set_parent(struct clk_hw *hw, u8 index) +{ + struct ccu_mult *cm = hw_to_ccu_mult(hw); + + return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index); +} + +const struct clk_ops ccu_mult_ops = { + .disable = ccu_mult_disable, + .enable = ccu_mult_enable, + .is_enabled = ccu_mult_is_enabled, + + .get_parent = ccu_mult_get_parent, + .set_parent = ccu_mult_set_parent, + + .determine_rate = ccu_mult_determine_rate, + .recalc_rate = ccu_mult_recalc_rate, + .set_rate = ccu_mult_set_rate, +}; diff --git a/drivers/clk/sunxi-ng/ccu_mult.h b/drivers/clk/sunxi-ng/ccu_mult.h index 609db66..5d2c8dc 100644 --- a/drivers/clk/sunxi-ng/ccu_mult.h +++ b/drivers/clk/sunxi-ng/ccu_mult.h @@ -1,6 +1,9 @@ #ifndef _CCU_MULT_H_ #define _CCU_MULT_H_ +#include "ccu_common.h" +#include "ccu_mux.h" + struct _ccu_mult { u8 shift; u8 width; @@ -12,4 +15,36 @@ struct _ccu_mult { .width = _width, \ } +struct ccu_mult { + u32 enable; + + struct _ccu_mult mult; + struct ccu_mux_internal mux; + struct ccu_common common; +}; + +#define SUNXI_CCU_N_WITH_GATE_LOCK(_struct, _name, _parent, _reg, \ + _mshift, _mwidth, _gate, _lock, \ + _flags) \ + struct ccu_mult _struct = { \ + .enable = _gate, \ + .mult = _SUNXI_CCU_MULT(_mshift, _mwidth), \ + .common = { \ + .reg = _reg, \ + .hw.init = CLK_HW_INIT(_name, \ + _parent, \ + &ccu_mult_ops, \ + _flags), \ + }, \ + } + +static inline struct ccu_mult *hw_to_ccu_mult(struct clk_hw *hw) +{ + struct ccu_common *common = hw_to_ccu_common(hw); + + return container_of(common, struct ccu_mult, common); +} + +extern const struct clk_ops ccu_mult_ops; + #endif /* _CCU_MULT_H_ */ |