From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/clk/sunxi-ng/ccu_mult.c | 175 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 drivers/clk/sunxi-ng/ccu_mult.c (limited to 'drivers/clk/sunxi-ng/ccu_mult.c') diff --git a/drivers/clk/sunxi-ng/ccu_mult.c b/drivers/clk/sunxi-ng/ccu_mult.c new file mode 100644 index 000000000..12e0783ca --- /dev/null +++ b/drivers/clk/sunxi-ng/ccu_mult.c @@ -0,0 +1,175 @@ +/* + * Copyright (C) 2016 Maxime Ripard + * Maxime Ripard + * + * 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 + +#include "ccu_gate.h" +#include "ccu_mult.h" + +struct _ccu_mult { + unsigned long mult, min, max; +}; + +static void ccu_mult_find_best(unsigned long parent, unsigned long rate, + struct _ccu_mult *mult) +{ + int _mult; + + _mult = rate / parent; + if (_mult < mult->min) + _mult = mult->min; + + if (_mult > mult->max) + _mult = mult->max; + + mult->mult = _mult; +} + +static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux, + struct clk_hw *parent, + unsigned long *parent_rate, + unsigned long rate, + void *data) +{ + struct ccu_mult *cm = data; + struct _ccu_mult _cm; + + _cm.min = cm->mult.min; + + if (cm->mult.max) + _cm.max = cm->mult.max; + else + _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1; + + ccu_mult_find_best(*parent_rate, rate, &_cm); + + return *parent_rate * _cm.mult; +} + +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; + + if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac)) + return ccu_frac_helper_read_rate(&cm->common, &cm->frac); + + reg = readl(cm->common.base + cm->common.reg); + val = reg >> cm->mult.shift; + val &= (1 << cm->mult.width) - 1; + + parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1, + parent_rate); + + return parent_rate * (val + cm->mult.offset); +} + +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); + struct _ccu_mult _cm; + unsigned long flags; + u32 reg; + + if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) { + ccu_frac_helper_enable(&cm->common, &cm->frac); + + return ccu_frac_helper_set_rate(&cm->common, &cm->frac, + rate, cm->lock); + } else { + ccu_frac_helper_disable(&cm->common, &cm->frac); + } + + parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1, + parent_rate); + + _cm.min = cm->mult.min; + + if (cm->mult.max) + _cm.max = cm->mult.max; + else + _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1; + + ccu_mult_find_best(parent_rate, rate, &_cm); + + 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); + reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift); + + writel(reg, cm->common.base + cm->common.reg); + + spin_unlock_irqrestore(cm->common.lock, flags); + + ccu_helper_wait_for_lock(&cm->common, cm->lock); + + 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, +}; -- cgit v1.2.3