^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2015 Maxime Ripard <maxime.ripard@free-electrons.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/clk-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline u32 clk_mult_readl(struct clk_multiplier *mult)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) if (mult->flags & CLK_MULTIPLIER_BIG_ENDIAN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) return ioread32be(mult->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) return readl(mult->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static inline void clk_mult_writel(struct clk_multiplier *mult, u32 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) if (mult->flags & CLK_MULTIPLIER_BIG_ENDIAN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) iowrite32be(val, mult->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) writel(val, mult->reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static unsigned long __get_mult(struct clk_multiplier *mult,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned long rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long parent_rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (mult->flags & CLK_MULTIPLIER_ROUND_CLOSEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return DIV_ROUND_CLOSEST(rate, parent_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return rate / parent_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static unsigned long clk_multiplier_recalc_rate(struct clk_hw *hw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned long parent_rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct clk_multiplier *mult = to_clk_multiplier(hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) val = clk_mult_readl(mult) >> mult->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) val &= GENMASK(mult->width - 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (!val && mult->flags & CLK_MULTIPLIER_ZERO_BYPASS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) val = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return parent_rate * val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static bool __is_best_rate(unsigned long rate, unsigned long new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned long best, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (flags & CLK_MULTIPLIER_ROUND_CLOSEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return abs(rate - new) < abs(rate - best);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return new >= rate && new < best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static unsigned long __bestmult(struct clk_hw *hw, unsigned long rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long *best_parent_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) u8 width, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct clk_multiplier *mult = to_clk_multiplier(hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) unsigned long orig_parent_rate = *best_parent_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned long parent_rate, current_rate, best_rate = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned int i, bestmult = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int maxmult = (1 << width) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) bestmult = rate / orig_parent_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* Make sure we don't end up with a 0 multiplier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if ((bestmult == 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) !(mult->flags & CLK_MULTIPLIER_ZERO_BYPASS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) bestmult = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* Make sure we don't overflow the multiplier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (bestmult > maxmult)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) bestmult = maxmult;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return bestmult;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) for (i = 1; i < maxmult; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (rate == orig_parent_rate * i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * This is the best case for us if we have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * perfect match without changing the parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * rate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *best_parent_rate = orig_parent_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) rate / i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) current_rate = parent_rate * i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (__is_best_rate(rate, current_rate, best_rate, flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) bestmult = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) best_rate = current_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *best_parent_rate = parent_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return bestmult;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static long clk_multiplier_round_rate(struct clk_hw *hw, unsigned long rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) unsigned long *parent_rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct clk_multiplier *mult = to_clk_multiplier(hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) unsigned long factor = __bestmult(hw, rate, parent_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) mult->width, mult->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return *parent_rate * factor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int clk_multiplier_set_rate(struct clk_hw *hw, unsigned long rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) unsigned long parent_rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct clk_multiplier *mult = to_clk_multiplier(hw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) unsigned long factor = __get_mult(mult, rate, parent_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) unsigned long flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (mult->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) spin_lock_irqsave(mult->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) __acquire(mult->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) val = clk_mult_readl(mult);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) val &= ~GENMASK(mult->width + mult->shift - 1, mult->shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) val |= factor << mult->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) clk_mult_writel(mult, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (mult->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) spin_unlock_irqrestore(mult->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) __release(mult->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) const struct clk_ops clk_multiplier_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .recalc_rate = clk_multiplier_recalc_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .round_rate = clk_multiplier_round_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .set_rate = clk_multiplier_set_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) EXPORT_SYMBOL_GPL(clk_multiplier_ops);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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